svm.c 191.0 KB
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// SPDX-License-Identifier: GPL-2.0-only
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/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * AMD SVM support
 *
 * Copyright (C) 2006 Qumranet, Inc.
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 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
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 *
 * Authors:
 *   Yaniv Kamay  <yaniv@qumranet.com>
 *   Avi Kivity   <avi@qumranet.com>
 */
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#define pr_fmt(fmt) "SVM: " fmt

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#include <linux/kvm_host.h>

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#include "irq.h"
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#include "mmu.h"
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#include "kvm_cache_regs.h"
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#include "x86.h"
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#include "cpuid.h"
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#include "pmu.h"
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/kernel.h>
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#include <linux/vmalloc.h>
#include <linux/highmem.h>
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#include <linux/sched.h>
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#include <linux/trace_events.h>
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#include <linux/slab.h>
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#include <linux/amd-iommu.h>
#include <linux/hashtable.h>
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#include <linux/frame.h>
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#include <linux/psp-sev.h>
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#include <linux/file.h>
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#include <linux/pagemap.h>
#include <linux/swap.h>
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#include <linux/rwsem.h>
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#include <asm/apic.h>
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#include <asm/perf_event.h>
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#include <asm/tlbflush.h>
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#include <asm/desc.h>
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#include <asm/debugreg.h>
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#include <asm/kvm_para.h>
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#include <asm/irq_remapping.h>
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#include <asm/spec-ctrl.h>
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#include <asm/virtext.h>
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#include "trace.h"
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#define __ex(x) __kvm_handle_fault_on_reboot(x)

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MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");

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static const struct x86_cpu_id svm_cpu_id[] = {
	X86_FEATURE_MATCH(X86_FEATURE_SVM),
	{}
};
MODULE_DEVICE_TABLE(x86cpu, svm_cpu_id);

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#define IOPM_ALLOC_ORDER 2
#define MSRPM_ALLOC_ORDER 1

#define SEG_TYPE_LDT 2
#define SEG_TYPE_BUSY_TSS16 3

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#define SVM_FEATURE_LBRV           (1 <<  1)
#define SVM_FEATURE_SVML           (1 <<  2)
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#define SVM_FEATURE_TSC_RATE       (1 <<  4)
#define SVM_FEATURE_VMCB_CLEAN     (1 <<  5)
#define SVM_FEATURE_FLUSH_ASID     (1 <<  6)
#define SVM_FEATURE_DECODE_ASSIST  (1 <<  7)
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#define SVM_FEATURE_PAUSE_FILTER   (1 << 10)
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#define SVM_AVIC_DOORBELL	0xc001011b

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#define NESTED_EXIT_HOST	0	/* Exit handled on host level */
#define NESTED_EXIT_DONE	1	/* Exit caused nested vmexit  */
#define NESTED_EXIT_CONTINUE	2	/* Further checks needed      */

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#define DEBUGCTL_RESERVED_BITS (~(0x3fULL))

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#define TSC_RATIO_RSVD          0xffffff0000000000ULL
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#define TSC_RATIO_MIN		0x0000000000000001ULL
#define TSC_RATIO_MAX		0x000000ffffffffffULL
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#define AVIC_HPA_MASK	~((0xFFFULL << 52) | 0xFFF)
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/*
 * 0xff is broadcast, so the max index allowed for physical APIC ID
 * table is 0xfe.  APIC IDs above 0xff are reserved.
 */
#define AVIC_MAX_PHYSICAL_ID_COUNT	255

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#define AVIC_UNACCEL_ACCESS_WRITE_MASK		1
#define AVIC_UNACCEL_ACCESS_OFFSET_MASK		0xFF0
#define AVIC_UNACCEL_ACCESS_VECTOR_MASK		0xFFFFFFFF

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/* AVIC GATAG is encoded using VM and VCPU IDs */
#define AVIC_VCPU_ID_BITS		8
#define AVIC_VCPU_ID_MASK		((1 << AVIC_VCPU_ID_BITS) - 1)

#define AVIC_VM_ID_BITS			24
#define AVIC_VM_ID_NR			(1 << AVIC_VM_ID_BITS)
#define AVIC_VM_ID_MASK			((1 << AVIC_VM_ID_BITS) - 1)

#define AVIC_GATAG(x, y)		(((x & AVIC_VM_ID_MASK) << AVIC_VCPU_ID_BITS) | \
						(y & AVIC_VCPU_ID_MASK))
#define AVIC_GATAG_TO_VMID(x)		((x >> AVIC_VCPU_ID_BITS) & AVIC_VM_ID_MASK)
#define AVIC_GATAG_TO_VCPUID(x)		(x & AVIC_VCPU_ID_MASK)

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static bool erratum_383_found __read_mostly;

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static const u32 host_save_user_msrs[] = {
#ifdef CONFIG_X86_64
	MSR_STAR, MSR_LSTAR, MSR_CSTAR, MSR_SYSCALL_MASK, MSR_KERNEL_GS_BASE,
	MSR_FS_BASE,
#endif
	MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
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	MSR_TSC_AUX,
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};

#define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs)

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struct kvm_sev_info {
	bool active;		/* SEV enabled guest */
	unsigned int asid;	/* ASID used for this guest */
	unsigned int handle;	/* SEV firmware handle */
	int fd;			/* SEV device fd */
	unsigned long pages_locked; /* Number of pages locked */
	struct list_head regions_list;  /* List of registered regions */
};

struct kvm_svm {
	struct kvm kvm;

	/* Struct members for AVIC */
	u32 avic_vm_id;
	struct page *avic_logical_id_table_page;
	struct page *avic_physical_id_table_page;
	struct hlist_node hnode;

	struct kvm_sev_info sev_info;
};

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struct kvm_vcpu;

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struct nested_state {
	struct vmcb *hsave;
	u64 hsave_msr;
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	u64 vm_cr_msr;
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	u64 vmcb;

	/* These are the merged vectors */
	u32 *msrpm;

	/* gpa pointers to the real vectors */
	u64 vmcb_msrpm;
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	u64 vmcb_iopm;
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	/* A VMEXIT is required but not yet emulated */
	bool exit_required;

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	/* cache for intercepts of the guest */
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	u32 intercept_cr;
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	u32 intercept_dr;
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	u32 intercept_exceptions;
	u64 intercept;

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	/* Nested Paging related state */
	u64 nested_cr3;
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};

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#define MSRPM_OFFSETS	16
static u32 msrpm_offsets[MSRPM_OFFSETS] __read_mostly;

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/*
 * Set osvw_len to higher value when updated Revision Guides
 * are published and we know what the new status bits are
 */
static uint64_t osvw_len = 4, osvw_status;

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struct vcpu_svm {
	struct kvm_vcpu vcpu;
	struct vmcb *vmcb;
	unsigned long vmcb_pa;
	struct svm_cpu_data *svm_data;
	uint64_t asid_generation;
	uint64_t sysenter_esp;
	uint64_t sysenter_eip;
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	uint64_t tsc_aux;
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	u64 msr_decfg;

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	u64 next_rip;

	u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS];
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	struct {
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		u16 fs;
		u16 gs;
		u16 ldt;
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		u64 gs_base;
	} host;
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	u64 spec_ctrl;
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	/*
	 * Contains guest-controlled bits of VIRT_SPEC_CTRL, which will be
	 * translated into the appropriate L2_CFG bits on the host to
	 * perform speculative control.
	 */
	u64 virt_spec_ctrl;
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	u32 *msrpm;

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	ulong nmi_iret_rip;

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	struct nested_state nested;
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	bool nmi_singlestep;
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	u64 nmi_singlestep_guest_rflags;
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	unsigned int3_injected;
	unsigned long int3_rip;
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	/* cached guest cpuid flags for faster access */
	bool nrips_enabled	: 1;
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	u32 ldr_reg;
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	u32 dfr_reg;
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	struct page *avic_backing_page;
	u64 *avic_physical_id_cache;
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	bool avic_is_running;
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	/*
	 * Per-vcpu list of struct amd_svm_iommu_ir:
	 * This is used mainly to store interrupt remapping information used
	 * when update the vcpu affinity. This avoids the need to scan for
	 * IRTE and try to match ga_tag in the IOMMU driver.
	 */
	struct list_head ir_list;
	spinlock_t ir_list_lock;
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	/* which host CPU was used for running this vcpu */
	unsigned int last_cpu;
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};

/*
 * This is a wrapper of struct amd_iommu_ir_data.
 */
struct amd_svm_iommu_ir {
	struct list_head node;	/* Used by SVM for per-vcpu ir_list */
	void *data;		/* Storing pointer to struct amd_ir_data */
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};

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#define AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK	(0xFF)
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#define AVIC_LOGICAL_ID_ENTRY_VALID_BIT			31
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#define AVIC_LOGICAL_ID_ENTRY_VALID_MASK		(1 << 31)

#define AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK	(0xFFULL)
#define AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK	(0xFFFFFFFFFFULL << 12)
#define AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK		(1ULL << 62)
#define AVIC_PHYSICAL_ID_ENTRY_VALID_MASK		(1ULL << 63)

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static DEFINE_PER_CPU(u64, current_tsc_ratio);
#define TSC_RATIO_DEFAULT	0x0100000000ULL

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#define MSR_INVALID			0xffffffffU

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static const struct svm_direct_access_msrs {
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	u32 index;   /* Index of the MSR */
	bool always; /* True if intercept is always on */
} direct_access_msrs[] = {
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	{ .index = MSR_STAR,				.always = true  },
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	{ .index = MSR_IA32_SYSENTER_CS,		.always = true  },
#ifdef CONFIG_X86_64
	{ .index = MSR_GS_BASE,				.always = true  },
	{ .index = MSR_FS_BASE,				.always = true  },
	{ .index = MSR_KERNEL_GS_BASE,			.always = true  },
	{ .index = MSR_LSTAR,				.always = true  },
	{ .index = MSR_CSTAR,				.always = true  },
	{ .index = MSR_SYSCALL_MASK,			.always = true  },
#endif
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	{ .index = MSR_IA32_SPEC_CTRL,			.always = false },
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	{ .index = MSR_IA32_PRED_CMD,			.always = false },
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	{ .index = MSR_IA32_LASTBRANCHFROMIP,		.always = false },
	{ .index = MSR_IA32_LASTBRANCHTOIP,		.always = false },
	{ .index = MSR_IA32_LASTINTFROMIP,		.always = false },
	{ .index = MSR_IA32_LASTINTTOIP,		.always = false },
	{ .index = MSR_INVALID,				.always = false },
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};

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/* enable NPT for AMD64 and X86 with PAE */
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
static bool npt_enabled = true;
#else
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static bool npt_enabled;
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#endif
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/*
 * These 2 parameters are used to config the controls for Pause-Loop Exiting:
 * pause_filter_count: On processors that support Pause filtering(indicated
 *	by CPUID Fn8000_000A_EDX), the VMCB provides a 16 bit pause filter
 *	count value. On VMRUN this value is loaded into an internal counter.
 *	Each time a pause instruction is executed, this counter is decremented
 *	until it reaches zero at which time a #VMEXIT is generated if pause
 *	intercept is enabled. Refer to  AMD APM Vol 2 Section 15.14.4 Pause
 *	Intercept Filtering for more details.
 *	This also indicate if ple logic enabled.
 *
 * pause_filter_thresh: In addition, some processor families support advanced
 *	pause filtering (indicated by CPUID Fn8000_000A_EDX) upper bound on
 *	the amount of time a guest is allowed to execute in a pause loop.
 *	In this mode, a 16-bit pause filter threshold field is added in the
 *	VMCB. The threshold value is a cycle count that is used to reset the
 *	pause counter. As with simple pause filtering, VMRUN loads the pause
 *	count value from VMCB into an internal counter. Then, on each pause
 *	instruction the hardware checks the elapsed number of cycles since
 *	the most recent pause instruction against the pause filter threshold.
 *	If the elapsed cycle count is greater than the pause filter threshold,
 *	then the internal pause count is reloaded from the VMCB and execution
 *	continues. If the elapsed cycle count is less than the pause filter
 *	threshold, then the internal pause count is decremented. If the count
 *	value is less than zero and PAUSE intercept is enabled, a #VMEXIT is
 *	triggered. If advanced pause filtering is supported and pause filter
 *	threshold field is set to zero, the filter will operate in the simpler,
 *	count only mode.
 */

static unsigned short pause_filter_thresh = KVM_DEFAULT_PLE_GAP;
module_param(pause_filter_thresh, ushort, 0444);

static unsigned short pause_filter_count = KVM_SVM_DEFAULT_PLE_WINDOW;
module_param(pause_filter_count, ushort, 0444);

/* Default doubles per-vcpu window every exit. */
static unsigned short pause_filter_count_grow = KVM_DEFAULT_PLE_WINDOW_GROW;
module_param(pause_filter_count_grow, ushort, 0444);

/* Default resets per-vcpu window every exit to pause_filter_count. */
static unsigned short pause_filter_count_shrink = KVM_DEFAULT_PLE_WINDOW_SHRINK;
module_param(pause_filter_count_shrink, ushort, 0444);

/* Default is to compute the maximum so we can never overflow. */
static unsigned short pause_filter_count_max = KVM_SVM_DEFAULT_PLE_WINDOW_MAX;
module_param(pause_filter_count_max, ushort, 0444);

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/* allow nested paging (virtualized MMU) for all guests */
static int npt = true;
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module_param(npt, int, S_IRUGO);
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/* allow nested virtualization in KVM/SVM */
static int nested = true;
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module_param(nested, int, S_IRUGO);

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/* enable / disable AVIC */
static int avic;
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#ifdef CONFIG_X86_LOCAL_APIC
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module_param(avic, int, S_IRUGO);
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#endif
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/* enable/disable Next RIP Save */
static int nrips = true;
module_param(nrips, int, 0444);

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/* enable/disable Virtual VMLOAD VMSAVE */
static int vls = true;
module_param(vls, int, 0444);

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/* enable/disable Virtual GIF */
static int vgif = true;
module_param(vgif, int, 0444);
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/* enable/disable SEV support */
static int sev = IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT);
module_param(sev, int, 0444);

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static bool __read_mostly dump_invalid_vmcb = 0;
module_param(dump_invalid_vmcb, bool, 0644);

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static u8 rsm_ins_bytes[] = "\x0f\xaa";

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static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
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static void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa);
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static void svm_complete_interrupts(struct vcpu_svm *svm);
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static inline void avic_post_state_restore(struct kvm_vcpu *vcpu);
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static int nested_svm_exit_handled(struct vcpu_svm *svm);
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static int nested_svm_intercept(struct vcpu_svm *svm);
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static int nested_svm_vmexit(struct vcpu_svm *svm);
static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
				      bool has_error_code, u32 error_code);

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enum {
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	VMCB_INTERCEPTS, /* Intercept vectors, TSC offset,
			    pause filter count */
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	VMCB_PERM_MAP,   /* IOPM Base and MSRPM Base */
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	VMCB_ASID,	 /* ASID */
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	VMCB_INTR,	 /* int_ctl, int_vector */
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	VMCB_NPT,        /* npt_en, nCR3, gPAT */
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	VMCB_CR,	 /* CR0, CR3, CR4, EFER */
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	VMCB_DR,         /* DR6, DR7 */
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	VMCB_DT,         /* GDT, IDT */
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	VMCB_SEG,        /* CS, DS, SS, ES, CPL */
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	VMCB_CR2,        /* CR2 only */
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	VMCB_LBR,        /* DBGCTL, BR_FROM, BR_TO, LAST_EX_FROM, LAST_EX_TO */
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	VMCB_AVIC,       /* AVIC APIC_BAR, AVIC APIC_BACKING_PAGE,
			  * AVIC PHYSICAL_TABLE pointer,
			  * AVIC LOGICAL_TABLE pointer
			  */
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	VMCB_DIRTY_MAX,
};

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/* TPR and CR2 are always written before VMRUN */
#define VMCB_ALWAYS_DIRTY_MASK	((1U << VMCB_INTR) | (1U << VMCB_CR2))
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#define VMCB_AVIC_APIC_BAR_MASK		0xFFFFFFFFFF000ULL

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static int sev_flush_asids(void);
static DECLARE_RWSEM(sev_deactivate_lock);
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static DEFINE_MUTEX(sev_bitmap_lock);
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static unsigned int max_sev_asid;
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static unsigned int min_sev_asid;
static unsigned long *sev_asid_bitmap;
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static unsigned long *sev_reclaim_asid_bitmap;
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#define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT)
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struct enc_region {
	struct list_head list;
	unsigned long npages;
	struct page **pages;
	unsigned long uaddr;
	unsigned long size;
};

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static inline struct kvm_svm *to_kvm_svm(struct kvm *kvm)
{
	return container_of(kvm, struct kvm_svm, kvm);
}

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static inline bool svm_sev_enabled(void)
{
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	return IS_ENABLED(CONFIG_KVM_AMD_SEV) ? max_sev_asid : 0;
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}

static inline bool sev_guest(struct kvm *kvm)
{
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#ifdef CONFIG_KVM_AMD_SEV
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	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
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	return sev->active;
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#else
	return false;
#endif
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}
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static inline int sev_get_asid(struct kvm *kvm)
{
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	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
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	return sev->asid;
}

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static inline void mark_all_dirty(struct vmcb *vmcb)
{
	vmcb->control.clean = 0;
}

static inline void mark_all_clean(struct vmcb *vmcb)
{
	vmcb->control.clean = ((1 << VMCB_DIRTY_MAX) - 1)
			       & ~VMCB_ALWAYS_DIRTY_MASK;
}

static inline void mark_dirty(struct vmcb *vmcb, int bit)
{
	vmcb->control.clean &= ~(1 << bit);
}

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static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
{
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	return container_of(vcpu, struct vcpu_svm, vcpu);
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}

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static inline void avic_update_vapic_bar(struct vcpu_svm *svm, u64 data)
{
	svm->vmcb->control.avic_vapic_bar = data & VMCB_AVIC_APIC_BAR_MASK;
	mark_dirty(svm->vmcb, VMCB_AVIC);
}

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static inline bool avic_vcpu_is_running(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 *entry = svm->avic_physical_id_cache;

	if (!entry)
		return false;

	return (READ_ONCE(*entry) & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK);
}

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static void recalc_intercepts(struct vcpu_svm *svm)
{
	struct vmcb_control_area *c, *h;
	struct nested_state *g;

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	mark_dirty(svm->vmcb, VMCB_INTERCEPTS);

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	if (!is_guest_mode(&svm->vcpu))
		return;

	c = &svm->vmcb->control;
	h = &svm->nested.hsave->control;
	g = &svm->nested;

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	c->intercept_cr = h->intercept_cr | g->intercept_cr;
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	c->intercept_dr = h->intercept_dr | g->intercept_dr;
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	c->intercept_exceptions = h->intercept_exceptions | g->intercept_exceptions;
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	c->intercept = h->intercept | g->intercept;
}

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static inline struct vmcb *get_host_vmcb(struct vcpu_svm *svm)
{
	if (is_guest_mode(&svm->vcpu))
		return svm->nested.hsave;
	else
		return svm->vmcb;
}

static inline void set_cr_intercept(struct vcpu_svm *svm, int bit)
{
	struct vmcb *vmcb = get_host_vmcb(svm);

	vmcb->control.intercept_cr |= (1U << bit);

	recalc_intercepts(svm);
}

static inline void clr_cr_intercept(struct vcpu_svm *svm, int bit)
{
	struct vmcb *vmcb = get_host_vmcb(svm);

	vmcb->control.intercept_cr &= ~(1U << bit);

	recalc_intercepts(svm);
}

static inline bool is_cr_intercept(struct vcpu_svm *svm, int bit)
{
	struct vmcb *vmcb = get_host_vmcb(svm);

	return vmcb->control.intercept_cr & (1U << bit);
}

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static inline void set_dr_intercepts(struct vcpu_svm *svm)
561 562 563
{
	struct vmcb *vmcb = get_host_vmcb(svm);

564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579
	vmcb->control.intercept_dr = (1 << INTERCEPT_DR0_READ)
		| (1 << INTERCEPT_DR1_READ)
		| (1 << INTERCEPT_DR2_READ)
		| (1 << INTERCEPT_DR3_READ)
		| (1 << INTERCEPT_DR4_READ)
		| (1 << INTERCEPT_DR5_READ)
		| (1 << INTERCEPT_DR6_READ)
		| (1 << INTERCEPT_DR7_READ)
		| (1 << INTERCEPT_DR0_WRITE)
		| (1 << INTERCEPT_DR1_WRITE)
		| (1 << INTERCEPT_DR2_WRITE)
		| (1 << INTERCEPT_DR3_WRITE)
		| (1 << INTERCEPT_DR4_WRITE)
		| (1 << INTERCEPT_DR5_WRITE)
		| (1 << INTERCEPT_DR6_WRITE)
		| (1 << INTERCEPT_DR7_WRITE);
580 581 582 583

	recalc_intercepts(svm);
}

584
static inline void clr_dr_intercepts(struct vcpu_svm *svm)
585 586 587
{
	struct vmcb *vmcb = get_host_vmcb(svm);

588
	vmcb->control.intercept_dr = 0;
589 590 591 592

	recalc_intercepts(svm);
}

593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
static inline void set_exception_intercept(struct vcpu_svm *svm, int bit)
{
	struct vmcb *vmcb = get_host_vmcb(svm);

	vmcb->control.intercept_exceptions |= (1U << bit);

	recalc_intercepts(svm);
}

static inline void clr_exception_intercept(struct vcpu_svm *svm, int bit)
{
	struct vmcb *vmcb = get_host_vmcb(svm);

	vmcb->control.intercept_exceptions &= ~(1U << bit);

	recalc_intercepts(svm);
}

611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628
static inline void set_intercept(struct vcpu_svm *svm, int bit)
{
	struct vmcb *vmcb = get_host_vmcb(svm);

	vmcb->control.intercept |= (1ULL << bit);

	recalc_intercepts(svm);
}

static inline void clr_intercept(struct vcpu_svm *svm, int bit)
{
	struct vmcb *vmcb = get_host_vmcb(svm);

	vmcb->control.intercept &= ~(1ULL << bit);

	recalc_intercepts(svm);
}

629 630 631 632 633
static inline bool vgif_enabled(struct vcpu_svm *svm)
{
	return !!(svm->vmcb->control.int_ctl & V_GIF_ENABLE_MASK);
}

634 635
static inline void enable_gif(struct vcpu_svm *svm)
{
636 637 638 639
	if (vgif_enabled(svm))
		svm->vmcb->control.int_ctl |= V_GIF_MASK;
	else
		svm->vcpu.arch.hflags |= HF_GIF_MASK;
640 641 642 643
}

static inline void disable_gif(struct vcpu_svm *svm)
{
644 645 646 647
	if (vgif_enabled(svm))
		svm->vmcb->control.int_ctl &= ~V_GIF_MASK;
	else
		svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
648 649 650 651
}

static inline bool gif_set(struct vcpu_svm *svm)
{
652 653 654 655
	if (vgif_enabled(svm))
		return !!(svm->vmcb->control.int_ctl & V_GIF_MASK);
	else
		return !!(svm->vcpu.arch.hflags & HF_GIF_MASK);
656 657
}

658
static unsigned long iopm_base;
A
Avi Kivity 已提交
659 660 661 662

struct kvm_ldttss_desc {
	u16 limit0;
	u16 base0;
J
Joerg Roedel 已提交
663 664
	unsigned base1:8, type:5, dpl:2, p:1;
	unsigned limit1:4, zero0:3, g:1, base2:8;
A
Avi Kivity 已提交
665 666 667 668 669 670 671
	u32 base3;
	u32 zero1;
} __attribute__((packed));

struct svm_cpu_data {
	int cpu;

A
Avi Kivity 已提交
672 673 674
	u64 asid_generation;
	u32 max_asid;
	u32 next_asid;
675
	u32 min_asid;
A
Avi Kivity 已提交
676 677 678
	struct kvm_ldttss_desc *tss_desc;

	struct page *save_area;
A
Ashok Raj 已提交
679
	struct vmcb *current_vmcb;
680 681 682

	/* index = sev_asid, value = vmcb pointer */
	struct vmcb **sev_vmcbs;
A
Avi Kivity 已提交
683 684 685 686
};

static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);

687
static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
A
Avi Kivity 已提交
688

689
#define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
A
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690 691 692
#define MSRS_RANGE_SIZE 2048
#define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)

693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713
static u32 svm_msrpm_offset(u32 msr)
{
	u32 offset;
	int i;

	for (i = 0; i < NUM_MSR_MAPS; i++) {
		if (msr < msrpm_ranges[i] ||
		    msr >= msrpm_ranges[i] + MSRS_IN_RANGE)
			continue;

		offset  = (msr - msrpm_ranges[i]) / 4; /* 4 msrs per u8 */
		offset += (i * MSRS_RANGE_SIZE);       /* add range offset */

		/* Now we have the u8 offset - but need the u32 offset */
		return offset / 4;
	}

	/* MSR not in any range */
	return MSR_INVALID;
}

A
Avi Kivity 已提交
714 715 716 717
#define MAX_INST_SIZE 15

static inline void clgi(void)
{
718
	asm volatile (__ex("clgi"));
A
Avi Kivity 已提交
719 720 721 722
}

static inline void stgi(void)
{
723
	asm volatile (__ex("stgi"));
A
Avi Kivity 已提交
724 725 726 727
}

static inline void invlpga(unsigned long addr, u32 asid)
{
728
	asm volatile (__ex("invlpga %1, %0") : : "c"(asid), "a"(addr));
A
Avi Kivity 已提交
729 730
}

731
static int get_npt_level(struct kvm_vcpu *vcpu)
732 733
{
#ifdef CONFIG_X86_64
734
	return PT64_ROOT_4LEVEL;
735 736 737 738 739
#else
	return PT32E_ROOT_LEVEL;
#endif
}

A
Avi Kivity 已提交
740 741
static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
742
	vcpu->arch.efer = efer;
743 744 745 746 747 748 749 750

	if (!npt_enabled) {
		/* Shadow paging assumes NX to be available.  */
		efer |= EFER_NX;

		if (!(efer & EFER_LMA))
			efer &= ~EFER_LME;
	}
A
Avi Kivity 已提交
751

752
	to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
753
	mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
A
Avi Kivity 已提交
754 755 756 757 758 759 760 761
}

static int is_external_interrupt(u32 info)
{
	info &= SVM_EVTINJ_TYPE_MASK | SVM_EVTINJ_VALID;
	return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
}

762
static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu)
763 764 765 766 767
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 ret = 0;

	if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
768 769
		ret = KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
	return ret;
770 771 772 773 774 775 776 777 778 779 780 781 782
}

static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (mask == 0)
		svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
	else
		svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;

}

783
static int skip_emulated_instruction(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
784
{
785 786
	struct vcpu_svm *svm = to_svm(vcpu);

787
	if (nrips && svm->vmcb->control.next_rip != 0) {
788
		WARN_ON_ONCE(!static_cpu_has(X86_FEATURE_NRIPS));
789
		svm->next_rip = svm->vmcb->control.next_rip;
790
	}
791

792 793 794 795 796 797 798 799 800
	if (!svm->next_rip) {
		if (!kvm_emulate_instruction(vcpu, EMULTYPE_SKIP))
			return 0;
	} else {
		if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE)
			pr_err("%s: ip 0x%lx next 0x%llx\n",
			       __func__, kvm_rip_read(vcpu), svm->next_rip);
		kvm_rip_write(vcpu, svm->next_rip);
	}
801
	svm_set_interrupt_shadow(vcpu, 0);
802

803
	return 1;
A
Avi Kivity 已提交
804 805
}

806
static void svm_queue_exception(struct kvm_vcpu *vcpu)
J
Jan Kiszka 已提交
807 808
{
	struct vcpu_svm *svm = to_svm(vcpu);
809 810
	unsigned nr = vcpu->arch.exception.nr;
	bool has_error_code = vcpu->arch.exception.has_error_code;
811
	bool reinject = vcpu->arch.exception.injected;
812
	u32 error_code = vcpu->arch.exception.error_code;
J
Jan Kiszka 已提交
813

J
Joerg Roedel 已提交
814 815 816 817
	/*
	 * If we are within a nested VM we'd better #VMEXIT and let the guest
	 * handle the exception
	 */
818 819
	if (!reinject &&
	    nested_svm_check_exception(svm, nr, has_error_code, error_code))
J
Jan Kiszka 已提交
820 821
		return;

822 823
	kvm_deliver_exception_payload(&svm->vcpu);

824
	if (nr == BP_VECTOR && !nrips) {
825 826 827 828 829 830 831 832 833
		unsigned long rip, old_rip = kvm_rip_read(&svm->vcpu);

		/*
		 * For guest debugging where we have to reinject #BP if some
		 * INT3 is guest-owned:
		 * Emulate nRIP by moving RIP forward. Will fail if injection
		 * raises a fault that is not intercepted. Still better than
		 * failing in all cases.
		 */
834
		(void)skip_emulated_instruction(&svm->vcpu);
835 836 837 838 839
		rip = kvm_rip_read(&svm->vcpu);
		svm->int3_rip = rip + svm->vmcb->save.cs.base;
		svm->int3_injected = rip - old_rip;
	}

J
Jan Kiszka 已提交
840 841 842 843 844 845 846
	svm->vmcb->control.event_inj = nr
		| SVM_EVTINJ_VALID
		| (has_error_code ? SVM_EVTINJ_VALID_ERR : 0)
		| SVM_EVTINJ_TYPE_EXEPT;
	svm->vmcb->control.event_inj_err = error_code;
}

847 848 849 850 851 852
static void svm_init_erratum_383(void)
{
	u32 low, high;
	int err;
	u64 val;

853
	if (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
		return;

	/* Use _safe variants to not break nested virtualization */
	val = native_read_msr_safe(MSR_AMD64_DC_CFG, &err);
	if (err)
		return;

	val |= (1ULL << 47);

	low  = lower_32_bits(val);
	high = upper_32_bits(val);

	native_write_msr_safe(MSR_AMD64_DC_CFG, low, high);

	erratum_383_found = true;
}

871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891
static void svm_init_osvw(struct kvm_vcpu *vcpu)
{
	/*
	 * Guests should see errata 400 and 415 as fixed (assuming that
	 * HLT and IO instructions are intercepted).
	 */
	vcpu->arch.osvw.length = (osvw_len >= 3) ? (osvw_len) : 3;
	vcpu->arch.osvw.status = osvw_status & ~(6ULL);

	/*
	 * By increasing VCPU's osvw.length to 3 we are telling the guest that
	 * all osvw.status bits inside that length, including bit 0 (which is
	 * reserved for erratum 298), are valid. However, if host processor's
	 * osvw_len is 0 then osvw_status[0] carries no information. We need to
	 * be conservative here and therefore we tell the guest that erratum 298
	 * is present (because we really don't know).
	 */
	if (osvw_len == 0 && boot_cpu_data.x86 == 0x10)
		vcpu->arch.osvw.status |= 1;
}

A
Avi Kivity 已提交
892 893
static int has_svm(void)
{
894
	const char *msg;
A
Avi Kivity 已提交
895

896
	if (!cpu_has_svm(&msg)) {
J
Joe Perches 已提交
897
		printk(KERN_INFO "has_svm: %s\n", msg);
A
Avi Kivity 已提交
898 899 900 901 902 903
		return 0;
	}

	return 1;
}

904
static void svm_hardware_disable(void)
A
Avi Kivity 已提交
905
{
906 907 908 909
	/* Make sure we clean up behind us */
	if (static_cpu_has(X86_FEATURE_TSCRATEMSR))
		wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);

910
	cpu_svm_disable();
911 912

	amd_pmu_disable_virt();
A
Avi Kivity 已提交
913 914
}

915
static int svm_hardware_enable(void)
A
Avi Kivity 已提交
916 917
{

918
	struct svm_cpu_data *sd;
A
Avi Kivity 已提交
919 920 921 922
	uint64_t efer;
	struct desc_struct *gdt;
	int me = raw_smp_processor_id();

923 924 925 926
	rdmsrl(MSR_EFER, efer);
	if (efer & EFER_SVME)
		return -EBUSY;

A
Avi Kivity 已提交
927
	if (!has_svm()) {
928
		pr_err("%s: err EOPNOTSUPP on %d\n", __func__, me);
929
		return -EINVAL;
A
Avi Kivity 已提交
930
	}
931 932
	sd = per_cpu(svm_data, me);
	if (!sd) {
933
		pr_err("%s: svm_data is NULL on %d\n", __func__, me);
934
		return -EINVAL;
A
Avi Kivity 已提交
935 936
	}

937 938 939
	sd->asid_generation = 1;
	sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
	sd->next_asid = sd->max_asid + 1;
940
	sd->min_asid = max_sev_asid + 1;
A
Avi Kivity 已提交
941

942
	gdt = get_current_gdt_rw();
943
	sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
A
Avi Kivity 已提交
944

945
	wrmsrl(MSR_EFER, efer | EFER_SVME);
A
Avi Kivity 已提交
946

947
	wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);
948

949 950
	if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
		wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
951
		__this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT);
952 953
	}

954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983

	/*
	 * Get OSVW bits.
	 *
	 * Note that it is possible to have a system with mixed processor
	 * revisions and therefore different OSVW bits. If bits are not the same
	 * on different processors then choose the worst case (i.e. if erratum
	 * is present on one processor and not on another then assume that the
	 * erratum is present everywhere).
	 */
	if (cpu_has(&boot_cpu_data, X86_FEATURE_OSVW)) {
		uint64_t len, status = 0;
		int err;

		len = native_read_msr_safe(MSR_AMD64_OSVW_ID_LENGTH, &err);
		if (!err)
			status = native_read_msr_safe(MSR_AMD64_OSVW_STATUS,
						      &err);

		if (err)
			osvw_status = osvw_len = 0;
		else {
			if (len < osvw_len)
				osvw_len = len;
			osvw_status |= status;
			osvw_status &= (1ULL << osvw_len) - 1;
		}
	} else
		osvw_status = osvw_len = 0;

984 985
	svm_init_erratum_383();

986 987
	amd_pmu_enable_virt();

988
	return 0;
A
Avi Kivity 已提交
989 990
}

991 992
static void svm_cpu_uninit(int cpu)
{
993
	struct svm_cpu_data *sd = per_cpu(svm_data, raw_smp_processor_id());
994

995
	if (!sd)
996 997 998
		return;

	per_cpu(svm_data, raw_smp_processor_id()) = NULL;
999
	kfree(sd->sev_vmcbs);
1000 1001
	__free_page(sd->save_area);
	kfree(sd);
1002 1003
}

A
Avi Kivity 已提交
1004 1005
static int svm_cpu_init(int cpu)
{
1006
	struct svm_cpu_data *sd;
A
Avi Kivity 已提交
1007 1008
	int r;

1009 1010
	sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
	if (!sd)
A
Avi Kivity 已提交
1011
		return -ENOMEM;
1012
	sd->cpu = cpu;
A
Avi Kivity 已提交
1013
	r = -ENOMEM;
1014
	sd->save_area = alloc_page(GFP_KERNEL);
1015
	if (!sd->save_area)
A
Avi Kivity 已提交
1016 1017
		goto err_1;

1018 1019
	if (svm_sev_enabled()) {
		r = -ENOMEM;
1020 1021 1022
		sd->sev_vmcbs = kmalloc_array(max_sev_asid + 1,
					      sizeof(void *),
					      GFP_KERNEL);
1023 1024 1025 1026
		if (!sd->sev_vmcbs)
			goto err_1;
	}

1027
	per_cpu(svm_data, cpu) = sd;
A
Avi Kivity 已提交
1028 1029 1030 1031

	return 0;

err_1:
1032
	kfree(sd);
A
Avi Kivity 已提交
1033 1034 1035 1036
	return r;

}

1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
static bool valid_msr_intercept(u32 index)
{
	int i;

	for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++)
		if (direct_access_msrs[i].index == index)
			return true;

	return false;
}

1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066
static bool msr_write_intercepted(struct kvm_vcpu *vcpu, unsigned msr)
{
	u8 bit_write;
	unsigned long tmp;
	u32 offset;
	u32 *msrpm;

	msrpm = is_guest_mode(vcpu) ? to_svm(vcpu)->nested.msrpm:
				      to_svm(vcpu)->msrpm;

	offset    = svm_msrpm_offset(msr);
	bit_write = 2 * (msr & 0x0f) + 1;
	tmp       = msrpm[offset];

	BUG_ON(offset == MSR_INVALID);

	return !!test_bit(bit_write,  &tmp);
}

1067 1068
static void set_msr_interception(u32 *msrpm, unsigned msr,
				 int read, int write)
A
Avi Kivity 已提交
1069
{
1070 1071 1072
	u8 bit_read, bit_write;
	unsigned long tmp;
	u32 offset;
A
Avi Kivity 已提交
1073

1074 1075 1076 1077 1078 1079
	/*
	 * If this warning triggers extend the direct_access_msrs list at the
	 * beginning of the file
	 */
	WARN_ON(!valid_msr_intercept(msr));

1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
	offset    = svm_msrpm_offset(msr);
	bit_read  = 2 * (msr & 0x0f);
	bit_write = 2 * (msr & 0x0f) + 1;
	tmp       = msrpm[offset];

	BUG_ON(offset == MSR_INVALID);

	read  ? clear_bit(bit_read,  &tmp) : set_bit(bit_read,  &tmp);
	write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp);

	msrpm[offset] = tmp;
A
Avi Kivity 已提交
1091 1092
}

1093
static void svm_vcpu_init_msrpm(u32 *msrpm)
A
Avi Kivity 已提交
1094 1095 1096
{
	int i;

1097 1098
	memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));

1099 1100 1101 1102 1103 1104
	for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
		if (!direct_access_msrs[i].always)
			continue;

		set_msr_interception(msrpm, direct_access_msrs[i].index, 1, 1);
	}
1105 1106
}

1107 1108 1109 1110 1111 1112 1113 1114
static void add_msr_offset(u32 offset)
{
	int i;

	for (i = 0; i < MSRPM_OFFSETS; ++i) {

		/* Offset already in list? */
		if (msrpm_offsets[i] == offset)
1115
			return;
1116 1117 1118 1119 1120 1121 1122 1123 1124

		/* Slot used by another offset? */
		if (msrpm_offsets[i] != MSR_INVALID)
			continue;

		/* Add offset to list */
		msrpm_offsets[i] = offset;

		return;
A
Avi Kivity 已提交
1125
	}
1126 1127 1128 1129 1130

	/*
	 * If this BUG triggers the msrpm_offsets table has an overflow. Just
	 * increase MSRPM_OFFSETS in this case.
	 */
1131
	BUG();
A
Avi Kivity 已提交
1132 1133
}

1134
static void init_msrpm_offsets(void)
1135
{
1136
	int i;
1137

1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
	memset(msrpm_offsets, 0xff, sizeof(msrpm_offsets));

	for (i = 0; direct_access_msrs[i].index != MSR_INVALID; i++) {
		u32 offset;

		offset = svm_msrpm_offset(direct_access_msrs[i].index);
		BUG_ON(offset == MSR_INVALID);

		add_msr_offset(offset);
	}
1148 1149
}

1150 1151 1152 1153
static void svm_enable_lbrv(struct vcpu_svm *svm)
{
	u32 *msrpm = svm->msrpm;

1154
	svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK;
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164
	set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
	set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
	set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
	set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
}

static void svm_disable_lbrv(struct vcpu_svm *svm)
{
	u32 *msrpm = svm->msrpm;

1165
	svm->vmcb->control.virt_ext &= ~LBR_CTL_ENABLE_MASK;
1166 1167 1168 1169 1170 1171
	set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
	set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
	set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
	set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
}

1172 1173 1174
static void disable_nmi_singlestep(struct vcpu_svm *svm)
{
	svm->nmi_singlestep = false;
1175

1176 1177 1178 1179 1180 1181 1182
	if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) {
		/* Clear our flags if they were not set by the guest */
		if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
			svm->vmcb->save.rflags &= ~X86_EFLAGS_TF;
		if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
			svm->vmcb->save.rflags &= ~X86_EFLAGS_RF;
	}
1183 1184
}

1185
/* Note:
1186
 * This hash table is used to map VM_ID to a struct kvm_svm,
1187 1188 1189 1190
 * when handling AMD IOMMU GALOG notification to schedule in
 * a particular vCPU.
 */
#define SVM_VM_DATA_HASH_BITS	8
1191
static DEFINE_HASHTABLE(svm_vm_data_hash, SVM_VM_DATA_HASH_BITS);
1192 1193
static u32 next_vm_id = 0;
static bool next_vm_id_wrapped = 0;
1194
static DEFINE_SPINLOCK(svm_vm_data_hash_lock);
1195 1196 1197 1198 1199 1200 1201 1202

/* Note:
 * This function is called from IOMMU driver to notify
 * SVM to schedule in a particular vCPU of a particular VM.
 */
static int avic_ga_log_notifier(u32 ga_tag)
{
	unsigned long flags;
1203
	struct kvm_svm *kvm_svm;
1204 1205 1206 1207 1208 1209 1210
	struct kvm_vcpu *vcpu = NULL;
	u32 vm_id = AVIC_GATAG_TO_VMID(ga_tag);
	u32 vcpu_id = AVIC_GATAG_TO_VCPUID(ga_tag);

	pr_debug("SVM: %s: vm_id=%#x, vcpu_id=%#x\n", __func__, vm_id, vcpu_id);

	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
1211 1212
	hash_for_each_possible(svm_vm_data_hash, kvm_svm, hnode, vm_id) {
		if (kvm_svm->avic_vm_id != vm_id)
1213
			continue;
1214
		vcpu = kvm_get_vcpu_by_id(&kvm_svm->kvm, vcpu_id);
1215 1216 1217 1218 1219 1220 1221 1222 1223
		break;
	}
	spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);

	/* Note:
	 * At this point, the IOMMU should have already set the pending
	 * bit in the vAPIC backing page. So, we just need to schedule
	 * in the vcpu.
	 */
1224
	if (vcpu)
1225 1226 1227 1228 1229
		kvm_vcpu_wake_up(vcpu);

	return 0;
}

B
Brijesh Singh 已提交
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
static __init int sev_hardware_setup(void)
{
	struct sev_user_data_status *status;
	int rc;

	/* Maximum number of encrypted guests supported simultaneously */
	max_sev_asid = cpuid_ecx(0x8000001F);

	if (!max_sev_asid)
		return 1;

B
Brijesh Singh 已提交
1241 1242 1243
	/* Minimum ASID value that should be used for SEV guest */
	min_sev_asid = cpuid_edx(0x8000001F);

1244
	/* Initialize SEV ASID bitmaps */
1245
	sev_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL);
B
Brijesh Singh 已提交
1246 1247 1248
	if (!sev_asid_bitmap)
		return 1;

1249 1250 1251 1252
	sev_reclaim_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL);
	if (!sev_reclaim_asid_bitmap)
		return 1;

B
Brijesh Singh 已提交
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274
	status = kmalloc(sizeof(*status), GFP_KERNEL);
	if (!status)
		return 1;

	/*
	 * Check SEV platform status.
	 *
	 * PLATFORM_STATUS can be called in any state, if we failed to query
	 * the PLATFORM status then either PSP firmware does not support SEV
	 * feature or SEV firmware is dead.
	 */
	rc = sev_platform_status(status, NULL);
	if (rc)
		goto err;

	pr_info("SEV supported\n");

err:
	kfree(status);
	return rc;
}

1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285
static void grow_ple_window(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;
	int old = control->pause_filter_count;

	control->pause_filter_count = __grow_ple_window(old,
							pause_filter_count,
							pause_filter_count_grow,
							pause_filter_count_max);

P
Peter Xu 已提交
1286
	if (control->pause_filter_count != old) {
1287
		mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
P
Peter Xu 已提交
1288 1289 1290
		trace_kvm_ple_window_update(vcpu->vcpu_id,
					    control->pause_filter_count, old);
	}
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303
}

static void shrink_ple_window(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;
	int old = control->pause_filter_count;

	control->pause_filter_count =
				__shrink_ple_window(old,
						    pause_filter_count,
						    pause_filter_count_shrink,
						    pause_filter_count);
P
Peter Xu 已提交
1304
	if (control->pause_filter_count != old) {
1305
		mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
P
Peter Xu 已提交
1306 1307 1308
		trace_kvm_ple_window_update(vcpu->vcpu_id,
					    control->pause_filter_count, old);
	}
1309 1310
}

1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351
/*
 * The default MMIO mask is a single bit (excluding the present bit),
 * which could conflict with the memory encryption bit. Check for
 * memory encryption support and override the default MMIO mask if
 * memory encryption is enabled.
 */
static __init void svm_adjust_mmio_mask(void)
{
	unsigned int enc_bit, mask_bit;
	u64 msr, mask;

	/* If there is no memory encryption support, use existing mask */
	if (cpuid_eax(0x80000000) < 0x8000001f)
		return;

	/* If memory encryption is not enabled, use existing mask */
	rdmsrl(MSR_K8_SYSCFG, msr);
	if (!(msr & MSR_K8_SYSCFG_MEM_ENCRYPT))
		return;

	enc_bit = cpuid_ebx(0x8000001f) & 0x3f;
	mask_bit = boot_cpu_data.x86_phys_bits;

	/* Increment the mask bit if it is the same as the encryption bit */
	if (enc_bit == mask_bit)
		mask_bit++;

	/*
	 * If the mask bit location is below 52, then some bits above the
	 * physical addressing limit will always be reserved, so use the
	 * rsvd_bits() function to generate the mask. This mask, along with
	 * the present bit, will be used to generate a page fault with
	 * PFER.RSV = 1.
	 *
	 * If the mask bit location is 52 (or above), then clear the mask.
	 */
	mask = (mask_bit < 52) ? rsvd_bits(mask_bit, 51) | PT_PRESENT_MASK : 0;

	kvm_mmu_set_mmio_spte_mask(mask, mask, PT_WRITABLE_MASK | PT_USER_MASK);
}

A
Avi Kivity 已提交
1352 1353 1354 1355
static __init int svm_hardware_setup(void)
{
	int cpu;
	struct page *iopm_pages;
1356
	void *iopm_va;
A
Avi Kivity 已提交
1357 1358 1359 1360 1361 1362
	int r;

	iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);

	if (!iopm_pages)
		return -ENOMEM;
1363 1364 1365

	iopm_va = page_address(iopm_pages);
	memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
A
Avi Kivity 已提交
1366 1367
	iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;

1368 1369
	init_msrpm_offsets();

1370 1371 1372
	if (boot_cpu_has(X86_FEATURE_NX))
		kvm_enable_efer_bits(EFER_NX);

A
Alexander Graf 已提交
1373 1374 1375
	if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
		kvm_enable_efer_bits(EFER_FFXSR);

1376 1377
	if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
		kvm_has_tsc_control = true;
1378 1379
		kvm_max_tsc_scaling_ratio = TSC_RATIO_MAX;
		kvm_tsc_scaling_ratio_frac_bits = 32;
1380 1381
	}

1382 1383 1384 1385 1386 1387 1388 1389
	/* Check for pause filtering support */
	if (!boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
		pause_filter_count = 0;
		pause_filter_thresh = 0;
	} else if (!boot_cpu_has(X86_FEATURE_PFTHRESHOLD)) {
		pause_filter_thresh = 0;
	}

1390 1391
	if (nested) {
		printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
1392
		kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
1393 1394
	}

B
Brijesh Singh 已提交
1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
	if (sev) {
		if (boot_cpu_has(X86_FEATURE_SEV) &&
		    IS_ENABLED(CONFIG_KVM_AMD_SEV)) {
			r = sev_hardware_setup();
			if (r)
				sev = false;
		} else {
			sev = false;
		}
	}

1406 1407
	svm_adjust_mmio_mask();

Z
Zachary Amsden 已提交
1408
	for_each_possible_cpu(cpu) {
A
Avi Kivity 已提交
1409 1410
		r = svm_cpu_init(cpu);
		if (r)
1411
			goto err;
A
Avi Kivity 已提交
1412
	}
1413

1414
	if (!boot_cpu_has(X86_FEATURE_NPT))
1415 1416
		npt_enabled = false;

1417 1418 1419 1420 1421
	if (npt_enabled && !npt) {
		printk(KERN_INFO "kvm: Nested Paging disabled\n");
		npt_enabled = false;
	}

1422
	if (npt_enabled) {
1423
		printk(KERN_INFO "kvm: Nested Paging enabled\n");
1424
		kvm_enable_tdp();
1425 1426
	} else
		kvm_disable_tdp();
1427

1428 1429 1430 1431 1432
	if (nrips) {
		if (!boot_cpu_has(X86_FEATURE_NRIPS))
			nrips = false;
	}

1433 1434 1435
	if (avic) {
		if (!npt_enabled ||
		    !boot_cpu_has(X86_FEATURE_AVIC) ||
1436
		    !IS_ENABLED(CONFIG_X86_LOCAL_APIC)) {
1437
			avic = false;
1438
		} else {
1439
			pr_info("AVIC enabled\n");
1440 1441 1442

			amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
		}
1443
	}
1444

1445 1446
	if (vls) {
		if (!npt_enabled ||
1447
		    !boot_cpu_has(X86_FEATURE_V_VMSAVE_VMLOAD) ||
1448 1449 1450 1451 1452 1453 1454
		    !IS_ENABLED(CONFIG_X86_64)) {
			vls = false;
		} else {
			pr_info("Virtual VMLOAD VMSAVE supported\n");
		}
	}

1455 1456 1457 1458 1459 1460 1461
	if (vgif) {
		if (!boot_cpu_has(X86_FEATURE_VGIF))
			vgif = false;
		else
			pr_info("Virtual GIF supported\n");
	}

A
Avi Kivity 已提交
1462 1463
	return 0;

1464
err:
A
Avi Kivity 已提交
1465 1466 1467 1468 1469 1470 1471
	__free_pages(iopm_pages, IOPM_ALLOC_ORDER);
	iopm_base = 0;
	return r;
}

static __exit void svm_hardware_unsetup(void)
{
1472 1473
	int cpu;

1474
	if (svm_sev_enabled()) {
1475
		bitmap_free(sev_asid_bitmap);
1476 1477 1478 1479
		bitmap_free(sev_reclaim_asid_bitmap);

		sev_flush_asids();
	}
B
Brijesh Singh 已提交
1480

Z
Zachary Amsden 已提交
1481
	for_each_possible_cpu(cpu)
1482 1483
		svm_cpu_uninit(cpu);

A
Avi Kivity 已提交
1484
	__free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
1485
	iopm_base = 0;
A
Avi Kivity 已提交
1486 1487 1488 1489 1490 1491
}

static void init_seg(struct vmcb_seg *seg)
{
	seg->selector = 0;
	seg->attrib = SVM_SELECTOR_P_MASK | SVM_SELECTOR_S_MASK |
J
Joerg Roedel 已提交
1492
		      SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
A
Avi Kivity 已提交
1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504
	seg->limit = 0xffff;
	seg->base = 0;
}

static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
{
	seg->selector = 0;
	seg->attrib = SVM_SELECTOR_P_MASK | type;
	seg->limit = 0xffff;
	seg->base = 0;
}

1505 1506 1507 1508 1509 1510 1511 1512 1513 1514
static u64 svm_read_l1_tsc_offset(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (is_guest_mode(vcpu))
		return svm->nested.hsave->control.tsc_offset;

	return vcpu->arch.tsc_offset;
}

1515
static u64 svm_write_l1_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
1516 1517 1518 1519
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 g_tsc_offset = 0;

1520
	if (is_guest_mode(vcpu)) {
1521
		/* Write L1's TSC offset.  */
1522 1523 1524
		g_tsc_offset = svm->vmcb->control.tsc_offset -
			       svm->nested.hsave->control.tsc_offset;
		svm->nested.hsave->control.tsc_offset = offset;
1525 1526 1527 1528 1529
	}

	trace_kvm_write_tsc_offset(vcpu->vcpu_id,
				   svm->vmcb->control.tsc_offset - g_tsc_offset,
				   offset);
1530 1531

	svm->vmcb->control.tsc_offset = offset + g_tsc_offset;
1532 1533

	mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
1534
	return svm->vmcb->control.tsc_offset;
1535 1536
}

1537 1538 1539
static void avic_init_vmcb(struct vcpu_svm *svm)
{
	struct vmcb *vmcb = svm->vmcb;
1540
	struct kvm_svm *kvm_svm = to_kvm_svm(svm->vcpu.kvm);
1541
	phys_addr_t bpa = __sme_set(page_to_phys(svm->avic_backing_page));
1542 1543
	phys_addr_t lpa = __sme_set(page_to_phys(kvm_svm->avic_logical_id_table_page));
	phys_addr_t ppa = __sme_set(page_to_phys(kvm_svm->avic_physical_id_table_page));
1544 1545 1546 1547 1548

	vmcb->control.avic_backing_page = bpa & AVIC_HPA_MASK;
	vmcb->control.avic_logical_id = lpa & AVIC_HPA_MASK;
	vmcb->control.avic_physical_id = ppa & AVIC_HPA_MASK;
	vmcb->control.avic_physical_id |= AVIC_MAX_PHYSICAL_ID_COUNT;
1549 1550 1551 1552
	if (kvm_apicv_activated(svm->vcpu.kvm))
		vmcb->control.int_ctl |= AVIC_ENABLE_MASK;
	else
		vmcb->control.int_ctl &= ~AVIC_ENABLE_MASK;
1553 1554
}

P
Paolo Bonzini 已提交
1555
static void init_vmcb(struct vcpu_svm *svm)
A
Avi Kivity 已提交
1556
{
1557 1558
	struct vmcb_control_area *control = &svm->vmcb->control;
	struct vmcb_save_area *save = &svm->vmcb->save;
A
Avi Kivity 已提交
1559

1560
	svm->vcpu.arch.hflags = 0;
1561

1562 1563 1564 1565 1566 1567
	set_cr_intercept(svm, INTERCEPT_CR0_READ);
	set_cr_intercept(svm, INTERCEPT_CR3_READ);
	set_cr_intercept(svm, INTERCEPT_CR4_READ);
	set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
	set_cr_intercept(svm, INTERCEPT_CR3_WRITE);
	set_cr_intercept(svm, INTERCEPT_CR4_WRITE);
1568 1569
	if (!kvm_vcpu_apicv_active(&svm->vcpu))
		set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
A
Avi Kivity 已提交
1570

1571
	set_dr_intercepts(svm);
A
Avi Kivity 已提交
1572

1573 1574 1575
	set_exception_intercept(svm, PF_VECTOR);
	set_exception_intercept(svm, UD_VECTOR);
	set_exception_intercept(svm, MC_VECTOR);
1576
	set_exception_intercept(svm, AC_VECTOR);
1577
	set_exception_intercept(svm, DB_VECTOR);
1578 1579 1580 1581 1582 1583 1584 1585
	/*
	 * Guest access to VMware backdoor ports could legitimately
	 * trigger #GP because of TSS I/O permission bitmap.
	 * We intercept those #GP and allow access to them anyway
	 * as VMware does.
	 */
	if (enable_vmware_backdoor)
		set_exception_intercept(svm, GP_VECTOR);
A
Avi Kivity 已提交
1586

1587 1588 1589 1590
	set_intercept(svm, INTERCEPT_INTR);
	set_intercept(svm, INTERCEPT_NMI);
	set_intercept(svm, INTERCEPT_SMI);
	set_intercept(svm, INTERCEPT_SELECTIVE_CR0);
A
Avi Kivity 已提交
1591
	set_intercept(svm, INTERCEPT_RDPMC);
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607
	set_intercept(svm, INTERCEPT_CPUID);
	set_intercept(svm, INTERCEPT_INVD);
	set_intercept(svm, INTERCEPT_INVLPG);
	set_intercept(svm, INTERCEPT_INVLPGA);
	set_intercept(svm, INTERCEPT_IOIO_PROT);
	set_intercept(svm, INTERCEPT_MSR_PROT);
	set_intercept(svm, INTERCEPT_TASK_SWITCH);
	set_intercept(svm, INTERCEPT_SHUTDOWN);
	set_intercept(svm, INTERCEPT_VMRUN);
	set_intercept(svm, INTERCEPT_VMMCALL);
	set_intercept(svm, INTERCEPT_VMLOAD);
	set_intercept(svm, INTERCEPT_VMSAVE);
	set_intercept(svm, INTERCEPT_STGI);
	set_intercept(svm, INTERCEPT_CLGI);
	set_intercept(svm, INTERCEPT_SKINIT);
	set_intercept(svm, INTERCEPT_WBINVD);
J
Joerg Roedel 已提交
1608
	set_intercept(svm, INTERCEPT_XSETBV);
J
Jim Mattson 已提交
1609
	set_intercept(svm, INTERCEPT_RDPRU);
B
Brijesh Singh 已提交
1610
	set_intercept(svm, INTERCEPT_RSM);
A
Avi Kivity 已提交
1611

1612
	if (!kvm_mwait_in_guest(svm->vcpu.kvm)) {
1613 1614 1615 1616
		set_intercept(svm, INTERCEPT_MONITOR);
		set_intercept(svm, INTERCEPT_MWAIT);
	}

1617 1618 1619
	if (!kvm_hlt_in_guest(svm->vcpu.kvm))
		set_intercept(svm, INTERCEPT_HLT);

1620 1621
	control->iopm_base_pa = __sme_set(iopm_base);
	control->msrpm_base_pa = __sme_set(__pa(svm->msrpm));
A
Avi Kivity 已提交
1622 1623 1624 1625 1626 1627 1628 1629 1630
	control->int_ctl = V_INTR_MASKING_MASK;

	init_seg(&save->es);
	init_seg(&save->ss);
	init_seg(&save->ds);
	init_seg(&save->fs);
	init_seg(&save->gs);

	save->cs.selector = 0xf000;
1631
	save->cs.base = 0xffff0000;
A
Avi Kivity 已提交
1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
	/* Executable/Readable Code Segment */
	save->cs.attrib = SVM_SELECTOR_READ_MASK | SVM_SELECTOR_P_MASK |
		SVM_SELECTOR_S_MASK | SVM_SELECTOR_CODE_MASK;
	save->cs.limit = 0xffff;

	save->gdtr.limit = 0xffff;
	save->idtr.limit = 0xffff;

	init_sys_seg(&save->ldtr, SEG_TYPE_LDT);
	init_sys_seg(&save->tr, SEG_TYPE_BUSY_TSS16);

P
Paolo Bonzini 已提交
1643
	svm_set_efer(&svm->vcpu, 0);
M
Mike Day 已提交
1644
	save->dr6 = 0xffff0ff0;
1645
	kvm_set_rflags(&svm->vcpu, 2);
A
Avi Kivity 已提交
1646
	save->rip = 0x0000fff0;
1647
	svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;
A
Avi Kivity 已提交
1648

J
Joerg Roedel 已提交
1649
	/*
1650
	 * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
1651
	 * It also updates the guest-visible cr0 value.
A
Avi Kivity 已提交
1652
	 */
1653
	svm_set_cr0(&svm->vcpu, X86_CR0_NW | X86_CR0_CD | X86_CR0_ET);
1654
	kvm_mmu_reset_context(&svm->vcpu);
1655

1656
	save->cr4 = X86_CR4_PAE;
A
Avi Kivity 已提交
1657
	/* rdx = ?? */
1658 1659 1660

	if (npt_enabled) {
		/* Setup VMCB for Nested Paging */
1661
		control->nested_ctl |= SVM_NESTED_CTL_NP_ENABLE;
1662
		clr_intercept(svm, INTERCEPT_INVLPG);
1663
		clr_exception_intercept(svm, PF_VECTOR);
1664 1665
		clr_cr_intercept(svm, INTERCEPT_CR3_READ);
		clr_cr_intercept(svm, INTERCEPT_CR3_WRITE);
1666
		save->g_pat = svm->vcpu.arch.pat;
1667 1668 1669
		save->cr3 = 0;
		save->cr4 = 0;
	}
1670
	svm->asid_generation = 0;
1671

1672
	svm->nested.vmcb = 0;
1673 1674
	svm->vcpu.arch.hflags = 0;

1675 1676 1677 1678
	if (pause_filter_count) {
		control->pause_filter_count = pause_filter_count;
		if (pause_filter_thresh)
			control->pause_filter_thresh = pause_filter_thresh;
1679
		set_intercept(svm, INTERCEPT_PAUSE);
1680 1681
	} else {
		clr_intercept(svm, INTERCEPT_PAUSE);
1682 1683
	}

1684
	if (kvm_vcpu_apicv_active(&svm->vcpu))
1685 1686
		avic_init_vmcb(svm);

1687 1688 1689 1690 1691 1692 1693 1694 1695 1696
	/*
	 * If hardware supports Virtual VMLOAD VMSAVE then enable it
	 * in VMCB and clear intercepts to avoid #VMEXIT.
	 */
	if (vls) {
		clr_intercept(svm, INTERCEPT_VMLOAD);
		clr_intercept(svm, INTERCEPT_VMSAVE);
		svm->vmcb->control.virt_ext |= VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK;
	}

1697 1698 1699 1700 1701 1702
	if (vgif) {
		clr_intercept(svm, INTERCEPT_STGI);
		clr_intercept(svm, INTERCEPT_CLGI);
		svm->vmcb->control.int_ctl |= V_GIF_ENABLE_MASK;
	}

1703
	if (sev_guest(svm->vcpu.kvm)) {
B
Brijesh Singh 已提交
1704
		svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ENABLE;
1705 1706
		clr_exception_intercept(svm, UD_VECTOR);
	}
B
Brijesh Singh 已提交
1707

1708 1709
	mark_all_dirty(svm->vmcb);

1710
	enable_gif(svm);
1711 1712 1713

}

1714 1715
static u64 *avic_get_physical_id_entry(struct kvm_vcpu *vcpu,
				       unsigned int index)
1716 1717
{
	u64 *avic_physical_id_table;
1718
	struct kvm_svm *kvm_svm = to_kvm_svm(vcpu->kvm);
1719 1720 1721 1722

	if (index >= AVIC_MAX_PHYSICAL_ID_COUNT)
		return NULL;

1723
	avic_physical_id_table = page_address(kvm_svm->avic_physical_id_table_page);
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735

	return &avic_physical_id_table[index];
}

/**
 * Note:
 * AVIC hardware walks the nested page table to check permissions,
 * but does not use the SPA address specified in the leaf page
 * table entry since it uses  address in the AVIC_BACKING_PAGE pointer
 * field of the VMCB. Therefore, we set up the
 * APIC_ACCESS_PAGE_PRIVATE_MEMSLOT (4KB) here.
 */
1736
static int avic_update_access_page(struct kvm *kvm, bool activate)
1737
{
1738
	int ret = 0;
1739

1740
	mutex_lock(&kvm->slots_lock);
1741
	if (kvm->arch.apic_access_page_done == activate)
1742
		goto out;
1743

1744 1745 1746
	ret = __x86_set_memory_region(kvm,
				      APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
				      APIC_DEFAULT_PHYS_BASE,
1747
				      activate ? PAGE_SIZE : 0);
1748
	if (ret)
1749
		goto out;
1750

1751
	kvm->arch.apic_access_page_done = activate;
1752 1753 1754
out:
	mutex_unlock(&kvm->slots_lock);
	return ret;
1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768
}

static int avic_init_backing_page(struct kvm_vcpu *vcpu)
{
	u64 *entry, new_entry;
	int id = vcpu->vcpu_id;
	struct vcpu_svm *svm = to_svm(vcpu);

	if (id >= AVIC_MAX_PHYSICAL_ID_COUNT)
		return -EINVAL;

	if (!svm->vcpu.arch.apic->regs)
		return -EINVAL;

1769 1770 1771 1772 1773 1774 1775 1776
	if (kvm_apicv_activated(vcpu->kvm)) {
		int ret;

		ret = avic_update_access_page(vcpu->kvm, true);
		if (ret)
			return ret;
	}

1777 1778 1779 1780 1781 1782 1783
	svm->avic_backing_page = virt_to_page(svm->vcpu.arch.apic->regs);

	/* Setting AVIC backing page address in the phy APIC ID table */
	entry = avic_get_physical_id_entry(vcpu, id);
	if (!entry)
		return -EINVAL;

1784 1785 1786
	new_entry = __sme_set((page_to_phys(svm->avic_backing_page) &
			      AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK) |
			      AVIC_PHYSICAL_ID_ENTRY_VALID_MASK);
1787 1788 1789 1790 1791 1792 1793
	WRITE_ONCE(*entry, new_entry);

	svm->avic_physical_id_cache = entry;

	return 0;
}

1794
static void sev_asid_free(int asid)
B
Brijesh Singh 已提交
1795
{
1796 1797
	struct svm_cpu_data *sd;
	int cpu, pos;
B
Brijesh Singh 已提交
1798

1799 1800
	mutex_lock(&sev_bitmap_lock);

B
Brijesh Singh 已提交
1801
	pos = asid - 1;
1802
	__set_bit(pos, sev_reclaim_asid_bitmap);
1803 1804 1805 1806 1807

	for_each_possible_cpu(cpu) {
		sd = per_cpu(svm_data, cpu);
		sd->sev_vmcbs[pos] = NULL;
	}
B
Brijesh Singh 已提交
1808

1809
	mutex_unlock(&sev_bitmap_lock);
B
Brijesh Singh 已提交
1810 1811
}

1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
static void sev_unbind_asid(struct kvm *kvm, unsigned int handle)
{
	struct sev_data_decommission *decommission;
	struct sev_data_deactivate *data;

	if (!handle)
		return;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return;

	/* deactivate handle */
	data->handle = handle;
1826

1827 1828
	/* Guard DEACTIVATE against WBINVD/DF_FLUSH used in ASID recycling */
	down_read(&sev_deactivate_lock);
1829
	sev_guest_deactivate(data, NULL);
1830
	up_read(&sev_deactivate_lock);
1831

1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844
	kfree(data);

	decommission = kzalloc(sizeof(*decommission), GFP_KERNEL);
	if (!decommission)
		return;

	/* decommission handle */
	decommission->handle = handle;
	sev_guest_decommission(decommission, NULL);

	kfree(decommission);
}

1845 1846 1847 1848
static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr,
				    unsigned long ulen, unsigned long *n,
				    int write)
{
1849
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1850 1851 1852
	unsigned long npages, npinned, size;
	unsigned long locked, lock_limit;
	struct page **pages;
1853 1854 1855 1856
	unsigned long first, last;

	if (ulen == 0 || uaddr + ulen < uaddr)
		return NULL;
1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872

	/* Calculate number of pages. */
	first = (uaddr & PAGE_MASK) >> PAGE_SHIFT;
	last = ((uaddr + ulen - 1) & PAGE_MASK) >> PAGE_SHIFT;
	npages = (last - first + 1);

	locked = sev->pages_locked + npages;
	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
	if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
		pr_err("SEV: %lu locked pages exceed the lock limit of %lu.\n", locked, lock_limit);
		return NULL;
	}

	/* Avoid using vmalloc for smaller buffers. */
	size = npages * sizeof(struct page *);
	if (size > PAGE_SIZE)
1873 1874
		pages = __vmalloc(size, GFP_KERNEL_ACCOUNT | __GFP_ZERO,
				  PAGE_KERNEL);
1875
	else
1876
		pages = kmalloc(size, GFP_KERNEL_ACCOUNT);
1877 1878 1879 1880 1881

	if (!pages)
		return NULL;

	/* Pin the user virtual address. */
1882
	npinned = get_user_pages_fast(uaddr, npages, FOLL_WRITE, pages);
1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903
	if (npinned != npages) {
		pr_err("SEV: Failure locking %lu pages.\n", npages);
		goto err;
	}

	*n = npages;
	sev->pages_locked = locked;

	return pages;

err:
	if (npinned > 0)
		release_pages(pages, npinned);

	kvfree(pages);
	return NULL;
}

static void sev_unpin_memory(struct kvm *kvm, struct page **pages,
			     unsigned long npages)
{
1904
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925

	release_pages(pages, npages);
	kvfree(pages);
	sev->pages_locked -= npages;
}

static void sev_clflush_pages(struct page *pages[], unsigned long npages)
{
	uint8_t *page_virtual;
	unsigned long i;

	if (npages == 0 || pages == NULL)
		return;

	for (i = 0; i < npages; i++) {
		page_virtual = kmap_atomic(pages[i]);
		clflush_cache_range(page_virtual, PAGE_SIZE);
		kunmap_atomic(page_virtual);
	}
}

1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941
static void __unregister_enc_region_locked(struct kvm *kvm,
					   struct enc_region *region)
{
	/*
	 * The guest may change the memory encryption attribute from C=0 -> C=1
	 * or vice versa for this memory range. Lets make sure caches are
	 * flushed to ensure that guest data gets written into memory with
	 * correct C-bit.
	 */
	sev_clflush_pages(region->pages, region->npages);

	sev_unpin_memory(kvm, region->pages, region->npages);
	list_del(&region->list);
	kfree(region);
}

1942 1943
static struct kvm *svm_vm_alloc(void)
{
1944 1945 1946
	struct kvm_svm *kvm_svm = __vmalloc(sizeof(struct kvm_svm),
					    GFP_KERNEL_ACCOUNT | __GFP_ZERO,
					    PAGE_KERNEL);
1947
	return &kvm_svm->kvm;
1948 1949 1950 1951
}

static void svm_vm_free(struct kvm *kvm)
{
1952
	vfree(to_kvm_svm(kvm));
1953 1954
}

B
Brijesh Singh 已提交
1955 1956
static void sev_vm_destroy(struct kvm *kvm)
{
1957
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
1958 1959
	struct list_head *head = &sev->regions_list;
	struct list_head *pos, *q;
1960

B
Brijesh Singh 已提交
1961 1962 1963
	if (!sev_guest(kvm))
		return;

1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978
	mutex_lock(&kvm->lock);

	/*
	 * if userspace was terminated before unregistering the memory regions
	 * then lets unpin all the registered memory.
	 */
	if (!list_empty(head)) {
		list_for_each_safe(pos, q, head) {
			__unregister_enc_region_locked(kvm,
				list_entry(pos, struct enc_region, list));
		}
	}

	mutex_unlock(&kvm->lock);

1979
	sev_unbind_asid(kvm, sev->handle);
1980
	sev_asid_free(sev->asid);
B
Brijesh Singh 已提交
1981 1982
}

1983 1984
static void avic_vm_destroy(struct kvm *kvm)
{
1985
	unsigned long flags;
1986
	struct kvm_svm *kvm_svm = to_kvm_svm(kvm);
1987

1988 1989 1990
	if (!avic)
		return;

1991 1992 1993 1994
	if (kvm_svm->avic_logical_id_table_page)
		__free_page(kvm_svm->avic_logical_id_table_page);
	if (kvm_svm->avic_physical_id_table_page)
		__free_page(kvm_svm->avic_physical_id_table_page);
1995 1996

	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
1997
	hash_del(&kvm_svm->hnode);
1998
	spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
1999 2000
}

B
Brijesh Singh 已提交
2001 2002 2003 2004 2005 2006
static void svm_vm_destroy(struct kvm *kvm)
{
	avic_vm_destroy(kvm);
	sev_vm_destroy(kvm);
}

2007 2008
static int avic_vm_init(struct kvm *kvm)
{
2009
	unsigned long flags;
2010
	int err = -ENOMEM;
2011 2012
	struct kvm_svm *kvm_svm = to_kvm_svm(kvm);
	struct kvm_svm *k2;
2013 2014
	struct page *p_page;
	struct page *l_page;
2015
	u32 vm_id;
2016 2017 2018 2019 2020

	if (!avic)
		return 0;

	/* Allocating physical APIC ID table (4KB) */
2021
	p_page = alloc_page(GFP_KERNEL_ACCOUNT);
2022 2023 2024
	if (!p_page)
		goto free_avic;

2025
	kvm_svm->avic_physical_id_table_page = p_page;
2026 2027 2028
	clear_page(page_address(p_page));

	/* Allocating logical APIC ID table (4KB) */
2029
	l_page = alloc_page(GFP_KERNEL_ACCOUNT);
2030 2031 2032
	if (!l_page)
		goto free_avic;

2033
	kvm_svm->avic_logical_id_table_page = l_page;
2034 2035
	clear_page(page_address(l_page));

2036
	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
2037 2038 2039 2040 2041 2042 2043 2044
 again:
	vm_id = next_vm_id = (next_vm_id + 1) & AVIC_VM_ID_MASK;
	if (vm_id == 0) { /* id is 1-based, zero is not okay */
		next_vm_id_wrapped = 1;
		goto again;
	}
	/* Is it still in use? Only possible if wrapped at least once */
	if (next_vm_id_wrapped) {
2045 2046
		hash_for_each_possible(svm_vm_data_hash, k2, hnode, vm_id) {
			if (k2->avic_vm_id == vm_id)
2047 2048 2049
				goto again;
		}
	}
2050 2051
	kvm_svm->avic_vm_id = vm_id;
	hash_add(svm_vm_data_hash, &kvm_svm->hnode, kvm_svm->avic_vm_id);
2052 2053
	spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);

2054 2055 2056 2057 2058
	return 0;

free_avic:
	avic_vm_destroy(kvm);
	return err;
A
Avi Kivity 已提交
2059 2060
}

2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072
static int svm_vm_init(struct kvm *kvm)
{
	if (avic) {
		int ret = avic_vm_init(kvm);
		if (ret)
			return ret;
	}

	kvm_apicv_init(kvm, avic && irqchip_split(kvm));
	return 0;
}

2073 2074
static inline int
avic_update_iommu_vcpu_affinity(struct kvm_vcpu *vcpu, int cpu, bool r)
2075
{
2076 2077 2078
	int ret = 0;
	unsigned long flags;
	struct amd_svm_iommu_ir *ir;
2079 2080
	struct vcpu_svm *svm = to_svm(vcpu);

2081 2082
	if (!kvm_arch_has_assigned_device(vcpu->kvm))
		return 0;
2083

2084 2085 2086 2087 2088
	/*
	 * Here, we go through the per-vcpu ir_list to update all existing
	 * interrupt remapping table entry targeting this vcpu.
	 */
	spin_lock_irqsave(&svm->ir_list_lock, flags);
2089

2090 2091
	if (list_empty(&svm->ir_list))
		goto out;
2092

2093 2094 2095 2096 2097 2098 2099 2100
	list_for_each_entry(ir, &svm->ir_list, node) {
		ret = amd_iommu_update_ga(cpu, r, ir->data);
		if (ret)
			break;
	}
out:
	spin_unlock_irqrestore(&svm->ir_list_lock, flags);
	return ret;
2101 2102 2103 2104 2105 2106
}

static void avic_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	u64 entry;
	/* ID = 0xff (broadcast), ID > 0xff (reserved) */
2107
	int h_physical_id = kvm_cpu_get_apicid(cpu);
2108 2109 2110 2111 2112
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!kvm_vcpu_apicv_active(vcpu))
		return;

2113 2114 2115 2116 2117
	/*
	 * Since the host physical APIC id is 8 bits,
	 * we can support host APIC ID upto 255.
	 */
	if (WARN_ON(h_physical_id > AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK))
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130
		return;

	entry = READ_ONCE(*(svm->avic_physical_id_cache));
	WARN_ON(entry & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK);

	entry &= ~AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK;
	entry |= (h_physical_id & AVIC_PHYSICAL_ID_ENTRY_HOST_PHYSICAL_ID_MASK);

	entry &= ~AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK;
	if (svm->avic_is_running)
		entry |= AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK;

	WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
2131 2132
	avic_update_iommu_vcpu_affinity(vcpu, h_physical_id,
					svm->avic_is_running);
2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143
}

static void avic_vcpu_put(struct kvm_vcpu *vcpu)
{
	u64 entry;
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!kvm_vcpu_apicv_active(vcpu))
		return;

	entry = READ_ONCE(*(svm->avic_physical_id_cache));
2144 2145 2146
	if (entry & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK)
		avic_update_iommu_vcpu_affinity(vcpu, -1, 0);

2147 2148
	entry &= ~AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK;
	WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
A
Avi Kivity 已提交
2149 2150
}

2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
/**
 * This function is called during VCPU halt/unhalt.
 */
static void avic_set_running(struct kvm_vcpu *vcpu, bool is_run)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm->avic_is_running = is_run;
	if (is_run)
		avic_vcpu_load(vcpu, vcpu->cpu);
	else
		avic_vcpu_put(vcpu);
}

2165
static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
2166 2167
{
	struct vcpu_svm *svm = to_svm(vcpu);
2168 2169
	u32 dummy;
	u32 eax = 1;
2170

2171
	vcpu->arch.microcode_version = 0x01000065;
2172
	svm->spec_ctrl = 0;
2173
	svm->virt_spec_ctrl = 0;
2174

2175 2176 2177 2178 2179 2180
	if (!init_event) {
		svm->vcpu.arch.apic_base = APIC_DEFAULT_PHYS_BASE |
					   MSR_IA32_APICBASE_ENABLE;
		if (kvm_vcpu_is_reset_bsp(&svm->vcpu))
			svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
	}
P
Paolo Bonzini 已提交
2181
	init_vmcb(svm);
A
Avi Kivity 已提交
2182

2183
	kvm_cpuid(vcpu, &eax, &dummy, &dummy, &dummy, true);
2184
	kvm_rdx_write(vcpu, eax);
2185 2186 2187

	if (kvm_vcpu_apicv_active(vcpu) && !init_event)
		avic_update_vapic_bar(svm, APIC_DEFAULT_PHYS_BASE);
2188 2189
}

2190 2191 2192 2193
static int avic_init_vcpu(struct vcpu_svm *svm)
{
	int ret;

2194
	if (!kvm_vcpu_apicv_active(&svm->vcpu))
2195 2196 2197 2198 2199 2200 2201 2202
		return 0;

	ret = avic_init_backing_page(&svm->vcpu);
	if (ret)
		return ret;

	INIT_LIST_HEAD(&svm->ir_list);
	spin_lock_init(&svm->ir_list_lock);
2203
	svm->dfr_reg = APIC_DFR_FLAT;
2204 2205 2206 2207

	return ret;
}

2208
static int svm_create_vcpu(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
2209
{
2210
	struct vcpu_svm *svm;
A
Avi Kivity 已提交
2211
	struct page *page;
2212
	struct page *msrpm_pages;
A
Alexander Graf 已提交
2213
	struct page *hsave_page;
A
Alexander Graf 已提交
2214
	struct page *nested_msrpm_pages;
R
Rusty Russell 已提交
2215
	int err;
A
Avi Kivity 已提交
2216

2217 2218
	BUILD_BUG_ON(offsetof(struct vcpu_svm, vcpu) != 0);
	svm = to_svm(vcpu);
R
Rusty Russell 已提交
2219

2220
	err = -ENOMEM;
2221
	page = alloc_page(GFP_KERNEL_ACCOUNT);
2222
	if (!page)
2223
		goto out;
A
Avi Kivity 已提交
2224

2225
	msrpm_pages = alloc_pages(GFP_KERNEL_ACCOUNT, MSRPM_ALLOC_ORDER);
2226
	if (!msrpm_pages)
2227
		goto free_page1;
A
Alexander Graf 已提交
2228

2229
	nested_msrpm_pages = alloc_pages(GFP_KERNEL_ACCOUNT, MSRPM_ALLOC_ORDER);
A
Alexander Graf 已提交
2230
	if (!nested_msrpm_pages)
2231
		goto free_page2;
2232

2233
	hsave_page = alloc_page(GFP_KERNEL_ACCOUNT);
A
Alexander Graf 已提交
2234
	if (!hsave_page)
2235 2236
		goto free_page3;

2237 2238 2239
	err = avic_init_vcpu(svm);
	if (err)
		goto free_page4;
2240

2241 2242 2243
	/* We initialize this flag to true to make sure that the is_running
	 * bit would be set the first time the vcpu is loaded.
	 */
2244 2245
	if (irqchip_in_kernel(vcpu->kvm) && kvm_apicv_activated(vcpu->kvm))
		svm->avic_is_running = true;
2246

2247
	svm->nested.hsave = page_address(hsave_page);
A
Alexander Graf 已提交
2248

2249 2250 2251
	svm->msrpm = page_address(msrpm_pages);
	svm_vcpu_init_msrpm(svm->msrpm);

2252
	svm->nested.msrpm = page_address(nested_msrpm_pages);
2253
	svm_vcpu_init_msrpm(svm->nested.msrpm);
A
Alexander Graf 已提交
2254

2255 2256
	svm->vmcb = page_address(page);
	clear_page(svm->vmcb);
2257
	svm->vmcb_pa = __sme_set(page_to_pfn(page) << PAGE_SHIFT);
2258
	svm->asid_generation = 0;
P
Paolo Bonzini 已提交
2259
	init_vmcb(svm);
A
Avi Kivity 已提交
2260

2261
	svm_init_osvw(vcpu);
2262

2263
	return 0;
2264

2265 2266
free_page4:
	__free_page(hsave_page);
2267 2268 2269 2270 2271 2272
free_page3:
	__free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
free_page2:
	__free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
free_page1:
	__free_page(page);
2273
out:
2274
	return err;
A
Avi Kivity 已提交
2275 2276
}

2277 2278 2279 2280 2281 2282 2283 2284
static void svm_clear_current_vmcb(struct vmcb *vmcb)
{
	int i;

	for_each_online_cpu(i)
		cmpxchg(&per_cpu(svm_data, i)->current_vmcb, vmcb, NULL);
}

A
Avi Kivity 已提交
2285 2286
static void svm_free_vcpu(struct kvm_vcpu *vcpu)
{
2287 2288
	struct vcpu_svm *svm = to_svm(vcpu);

2289 2290 2291 2292 2293 2294 2295
	/*
	 * The vmcb page can be recycled, causing a false negative in
	 * svm_vcpu_load(). So, ensure that no logical CPU has this
	 * vmcb page recorded as its current vmcb.
	 */
	svm_clear_current_vmcb(svm->vmcb);

2296
	__free_page(pfn_to_page(__sme_clr(svm->vmcb_pa) >> PAGE_SHIFT));
2297
	__free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
2298 2299
	__free_page(virt_to_page(svm->nested.hsave));
	__free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
A
Avi Kivity 已提交
2300 2301
}

2302
static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
A
Avi Kivity 已提交
2303
{
2304
	struct vcpu_svm *svm = to_svm(vcpu);
A
Ashok Raj 已提交
2305
	struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
2306
	int i;
2307 2308

	if (unlikely(cpu != vcpu->cpu)) {
2309
		svm->asid_generation = 0;
2310
		mark_all_dirty(svm->vmcb);
2311
	}
2312

2313 2314 2315
#ifdef CONFIG_X86_64
	rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host.gs_base);
#endif
2316 2317 2318 2319
	savesegment(fs, svm->host.fs);
	savesegment(gs, svm->host.gs);
	svm->host.ldt = kvm_read_ldt();

2320
	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
2321
		rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
2322

2323 2324 2325 2326 2327 2328
	if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
		u64 tsc_ratio = vcpu->arch.tsc_scaling_ratio;
		if (tsc_ratio != __this_cpu_read(current_tsc_ratio)) {
			__this_cpu_write(current_tsc_ratio, tsc_ratio);
			wrmsrl(MSR_AMD64_TSC_RATIO, tsc_ratio);
		}
2329
	}
P
Paolo Bonzini 已提交
2330 2331 2332
	/* This assumes that the kernel never uses MSR_TSC_AUX */
	if (static_cpu_has(X86_FEATURE_RDTSCP))
		wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
2333

A
Ashok Raj 已提交
2334 2335 2336 2337
	if (sd->current_vmcb != svm->vmcb) {
		sd->current_vmcb = svm->vmcb;
		indirect_branch_prediction_barrier();
	}
2338
	avic_vcpu_load(vcpu, cpu);
A
Avi Kivity 已提交
2339 2340 2341 2342
}

static void svm_vcpu_put(struct kvm_vcpu *vcpu)
{
2343
	struct vcpu_svm *svm = to_svm(vcpu);
2344 2345
	int i;

2346 2347
	avic_vcpu_put(vcpu);

2348
	++vcpu->stat.host_state_reload;
2349 2350 2351
	kvm_load_ldt(svm->host.ldt);
#ifdef CONFIG_X86_64
	loadsegment(fs, svm->host.fs);
2352
	wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gsbase);
2353
	load_gs_index(svm->host.gs);
2354
#else
2355
#ifdef CONFIG_X86_32_LAZY_GS
2356
	loadsegment(gs, svm->host.gs);
2357
#endif
2358
#endif
2359
	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
2360
		wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
A
Avi Kivity 已提交
2361 2362
}

2363 2364 2365 2366 2367 2368 2369
static void svm_vcpu_blocking(struct kvm_vcpu *vcpu)
{
	avic_set_running(vcpu, false);
}

static void svm_vcpu_unblocking(struct kvm_vcpu *vcpu)
{
2370 2371
	if (kvm_check_request(KVM_REQ_APICV_UPDATE, vcpu))
		kvm_vcpu_update_apicv(vcpu);
2372 2373 2374
	avic_set_running(vcpu, true);
}

A
Avi Kivity 已提交
2375 2376
static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
{
2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387
	struct vcpu_svm *svm = to_svm(vcpu);
	unsigned long rflags = svm->vmcb->save.rflags;

	if (svm->nmi_singlestep) {
		/* Hide our flags if they were not set by the guest */
		if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF))
			rflags &= ~X86_EFLAGS_TF;
		if (!(svm->nmi_singlestep_guest_rflags & X86_EFLAGS_RF))
			rflags &= ~X86_EFLAGS_RF;
	}
	return rflags;
A
Avi Kivity 已提交
2388 2389 2390 2391
}

static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
2392 2393 2394
	if (to_svm(vcpu)->nmi_singlestep)
		rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);

P
Paolo Bonzini 已提交
2395
       /*
A
Andrea Gelmini 已提交
2396
        * Any change of EFLAGS.VM is accompanied by a reload of SS
P
Paolo Bonzini 已提交
2397 2398 2399
        * (caused by either a task switch or an inter-privilege IRET),
        * so we do not need to update the CPL here.
        */
2400
	to_svm(vcpu)->vmcb->save.rflags = rflags;
A
Avi Kivity 已提交
2401 2402
}

A
Avi Kivity 已提交
2403 2404 2405 2406 2407
static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
{
	switch (reg) {
	case VCPU_EXREG_PDPTR:
		BUG_ON(!npt_enabled);
2408
		load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
A
Avi Kivity 已提交
2409 2410
		break;
	default:
2411
		WARN_ON_ONCE(1);
A
Avi Kivity 已提交
2412 2413 2414
	}
}

2415 2416
static void svm_set_vintr(struct vcpu_svm *svm)
{
2417
	set_intercept(svm, INTERCEPT_VINTR);
2418 2419 2420 2421
}

static void svm_clear_vintr(struct vcpu_svm *svm)
{
2422
	clr_intercept(svm, INTERCEPT_VINTR);
2423 2424
}

A
Avi Kivity 已提交
2425 2426
static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
{
2427
	struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
A
Avi Kivity 已提交
2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439

	switch (seg) {
	case VCPU_SREG_CS: return &save->cs;
	case VCPU_SREG_DS: return &save->ds;
	case VCPU_SREG_ES: return &save->es;
	case VCPU_SREG_FS: return &save->fs;
	case VCPU_SREG_GS: return &save->gs;
	case VCPU_SREG_SS: return &save->ss;
	case VCPU_SREG_TR: return &save->tr;
	case VCPU_SREG_LDTR: return &save->ldtr;
	}
	BUG();
A
Al Viro 已提交
2440
	return NULL;
A
Avi Kivity 已提交
2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464
}

static u64 svm_get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
	struct vmcb_seg *s = svm_seg(vcpu, seg);

	return s->base;
}

static void svm_get_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
	struct vmcb_seg *s = svm_seg(vcpu, seg);

	var->base = s->base;
	var->limit = s->limit;
	var->selector = s->selector;
	var->type = s->attrib & SVM_SELECTOR_TYPE_MASK;
	var->s = (s->attrib >> SVM_SELECTOR_S_SHIFT) & 1;
	var->dpl = (s->attrib >> SVM_SELECTOR_DPL_SHIFT) & 3;
	var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
	var->avl = (s->attrib >> SVM_SELECTOR_AVL_SHIFT) & 1;
	var->l = (s->attrib >> SVM_SELECTOR_L_SHIFT) & 1;
	var->db = (s->attrib >> SVM_SELECTOR_DB_SHIFT) & 1;
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474

	/*
	 * AMD CPUs circa 2014 track the G bit for all segments except CS.
	 * However, the SVM spec states that the G bit is not observed by the
	 * CPU, and some VMware virtual CPUs drop the G bit for all segments.
	 * So let's synthesize a legal G bit for all segments, this helps
	 * running KVM nested. It also helps cross-vendor migration, because
	 * Intel's vmentry has a check on the 'G' bit.
	 */
	var->g = s->limit > 0xfffff;
2475

J
Joerg Roedel 已提交
2476 2477
	/*
	 * AMD's VMCB does not have an explicit unusable field, so emulate it
2478 2479
	 * for cross vendor migration purposes by "not present"
	 */
2480
	var->unusable = !var->present;
2481

2482 2483 2484 2485 2486 2487
	switch (seg) {
	case VCPU_SREG_TR:
		/*
		 * Work around a bug where the busy flag in the tr selector
		 * isn't exposed
		 */
2488
		var->type |= 0x2;
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503
		break;
	case VCPU_SREG_DS:
	case VCPU_SREG_ES:
	case VCPU_SREG_FS:
	case VCPU_SREG_GS:
		/*
		 * The accessed bit must always be set in the segment
		 * descriptor cache, although it can be cleared in the
		 * descriptor, the cached bit always remains at 1. Since
		 * Intel has a check on this, set it here to support
		 * cross-vendor migration.
		 */
		if (!var->unusable)
			var->type |= 0x1;
		break;
2504
	case VCPU_SREG_SS:
J
Joerg Roedel 已提交
2505 2506
		/*
		 * On AMD CPUs sometimes the DB bit in the segment
2507 2508 2509 2510 2511 2512
		 * descriptor is left as 1, although the whole segment has
		 * been made unusable. Clear it here to pass an Intel VMX
		 * entry check when cross vendor migrating.
		 */
		if (var->unusable)
			var->db = 0;
2513
		/* This is symmetric with svm_set_segment() */
J
Jan Kiszka 已提交
2514
		var->dpl = to_svm(vcpu)->vmcb->save.cpl;
2515
		break;
2516
	}
A
Avi Kivity 已提交
2517 2518
}

2519 2520 2521 2522 2523 2524 2525
static int svm_get_cpl(struct kvm_vcpu *vcpu)
{
	struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;

	return save->cpl;
}

2526
static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2527
{
2528 2529
	struct vcpu_svm *svm = to_svm(vcpu);

2530 2531
	dt->size = svm->vmcb->save.idtr.limit;
	dt->address = svm->vmcb->save.idtr.base;
A
Avi Kivity 已提交
2532 2533
}

2534
static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2535
{
2536 2537
	struct vcpu_svm *svm = to_svm(vcpu);

2538 2539
	svm->vmcb->save.idtr.limit = dt->size;
	svm->vmcb->save.idtr.base = dt->address ;
2540
	mark_dirty(svm->vmcb, VMCB_DT);
A
Avi Kivity 已提交
2541 2542
}

2543
static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2544
{
2545 2546
	struct vcpu_svm *svm = to_svm(vcpu);

2547 2548
	dt->size = svm->vmcb->save.gdtr.limit;
	dt->address = svm->vmcb->save.gdtr.base;
A
Avi Kivity 已提交
2549 2550
}

2551
static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2552
{
2553 2554
	struct vcpu_svm *svm = to_svm(vcpu);

2555 2556
	svm->vmcb->save.gdtr.limit = dt->size;
	svm->vmcb->save.gdtr.base = dt->address ;
2557
	mark_dirty(svm->vmcb, VMCB_DT);
A
Avi Kivity 已提交
2558 2559
}

2560 2561 2562 2563
static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
{
}

2564
static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
2565 2566 2567
{
}

A
Avi Kivity 已提交
2568 2569 2570 2571 2572
static void update_cr0_intercept(struct vcpu_svm *svm)
{
	ulong gcr0 = svm->vcpu.arch.cr0;
	u64 *hcr0 = &svm->vmcb->save.cr0;

2573 2574
	*hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
		| (gcr0 & SVM_CR0_SELECTIVE_MASK);
A
Avi Kivity 已提交
2575

2576
	mark_dirty(svm->vmcb, VMCB_CR);
A
Avi Kivity 已提交
2577

2578
	if (gcr0 == *hcr0) {
2579 2580
		clr_cr_intercept(svm, INTERCEPT_CR0_READ);
		clr_cr_intercept(svm, INTERCEPT_CR0_WRITE);
A
Avi Kivity 已提交
2581
	} else {
2582 2583
		set_cr_intercept(svm, INTERCEPT_CR0_READ);
		set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
A
Avi Kivity 已提交
2584 2585 2586
	}
}

A
Avi Kivity 已提交
2587 2588
static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
2589 2590
	struct vcpu_svm *svm = to_svm(vcpu);

2591
#ifdef CONFIG_X86_64
2592
	if (vcpu->arch.efer & EFER_LME) {
2593
		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
2594
			vcpu->arch.efer |= EFER_LMA;
2595
			svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
A
Avi Kivity 已提交
2596 2597
		}

M
Mike Day 已提交
2598
		if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
2599
			vcpu->arch.efer &= ~EFER_LMA;
2600
			svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
A
Avi Kivity 已提交
2601 2602 2603
		}
	}
#endif
2604
	vcpu->arch.cr0 = cr0;
2605 2606 2607

	if (!npt_enabled)
		cr0 |= X86_CR0_PG | X86_CR0_WP;
2608

2609 2610 2611 2612 2613 2614 2615
	/*
	 * re-enable caching here because the QEMU bios
	 * does not do it - this results in some delay at
	 * reboot
	 */
	if (kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
		cr0 &= ~(X86_CR0_CD | X86_CR0_NW);
2616
	svm->vmcb->save.cr0 = cr0;
2617
	mark_dirty(svm->vmcb, VMCB_CR);
A
Avi Kivity 已提交
2618
	update_cr0_intercept(svm);
A
Avi Kivity 已提交
2619 2620
}

2621
static int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
A
Avi Kivity 已提交
2622
{
2623
	unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
2624 2625
	unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;

2626 2627 2628
	if (cr4 & X86_CR4_VMXE)
		return 1;

2629
	if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
2630
		svm_flush_tlb(vcpu, true);
2631

2632 2633 2634
	vcpu->arch.cr4 = cr4;
	if (!npt_enabled)
		cr4 |= X86_CR4_PAE;
2635
	cr4 |= host_cr4_mce;
2636
	to_svm(vcpu)->vmcb->save.cr4 = cr4;
2637
	mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
2638
	return 0;
A
Avi Kivity 已提交
2639 2640 2641 2642 2643
}

static void svm_set_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
2644
	struct vcpu_svm *svm = to_svm(vcpu);
A
Avi Kivity 已提交
2645 2646 2647 2648 2649
	struct vmcb_seg *s = svm_seg(vcpu, seg);

	s->base = var->base;
	s->limit = var->limit;
	s->selector = var->selector;
2650 2651 2652 2653 2654 2655 2656 2657
	s->attrib = (var->type & SVM_SELECTOR_TYPE_MASK);
	s->attrib |= (var->s & 1) << SVM_SELECTOR_S_SHIFT;
	s->attrib |= (var->dpl & 3) << SVM_SELECTOR_DPL_SHIFT;
	s->attrib |= ((var->present & 1) && !var->unusable) << SVM_SELECTOR_P_SHIFT;
	s->attrib |= (var->avl & 1) << SVM_SELECTOR_AVL_SHIFT;
	s->attrib |= (var->l & 1) << SVM_SELECTOR_L_SHIFT;
	s->attrib |= (var->db & 1) << SVM_SELECTOR_DB_SHIFT;
	s->attrib |= (var->g & 1) << SVM_SELECTOR_G_SHIFT;
P
Paolo Bonzini 已提交
2658 2659 2660 2661 2662 2663 2664 2665

	/*
	 * This is always accurate, except if SYSRET returned to a segment
	 * with SS.DPL != 3.  Intel does not have this quirk, and always
	 * forces SS.DPL to 3 on sysret, so we ignore that case; fixing it
	 * would entail passing the CPL to userspace and back.
	 */
	if (seg == VCPU_SREG_SS)
2666 2667
		/* This is symmetric with svm_get_segment() */
		svm->vmcb->save.cpl = (var->dpl & 3);
A
Avi Kivity 已提交
2668

2669
	mark_dirty(svm->vmcb, VMCB_SEG);
A
Avi Kivity 已提交
2670 2671
}

2672
static void update_bp_intercept(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
2673
{
J
Jan Kiszka 已提交
2674 2675
	struct vcpu_svm *svm = to_svm(vcpu);

2676
	clr_exception_intercept(svm, BP_VECTOR);
2677

J
Jan Kiszka 已提交
2678 2679
	if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
2680
			set_exception_intercept(svm, BP_VECTOR);
J
Jan Kiszka 已提交
2681 2682
	} else
		vcpu->guest_debug = 0;
2683 2684
}

2685
static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
A
Avi Kivity 已提交
2686
{
2687 2688
	if (sd->next_asid > sd->max_asid) {
		++sd->asid_generation;
2689
		sd->next_asid = sd->min_asid;
2690
		svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
A
Avi Kivity 已提交
2691 2692
	}

2693 2694
	svm->asid_generation = sd->asid_generation;
	svm->vmcb->control.asid = sd->next_asid++;
2695 2696

	mark_dirty(svm->vmcb, VMCB_ASID);
A
Avi Kivity 已提交
2697 2698
}

J
Jan Kiszka 已提交
2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711
static u64 svm_get_dr6(struct kvm_vcpu *vcpu)
{
	return to_svm(vcpu)->vmcb->save.dr6;
}

static void svm_set_dr6(struct kvm_vcpu *vcpu, unsigned long value)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm->vmcb->save.dr6 = value;
	mark_dirty(svm->vmcb, VMCB_DR);
}

2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726
static void svm_sync_dirty_debug_regs(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	get_debugreg(vcpu->arch.db[0], 0);
	get_debugreg(vcpu->arch.db[1], 1);
	get_debugreg(vcpu->arch.db[2], 2);
	get_debugreg(vcpu->arch.db[3], 3);
	vcpu->arch.dr6 = svm_get_dr6(vcpu);
	vcpu->arch.dr7 = svm->vmcb->save.dr7;

	vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT;
	set_dr_intercepts(svm);
}

2727
static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
A
Avi Kivity 已提交
2728
{
2729 2730
	struct vcpu_svm *svm = to_svm(vcpu);

2731
	svm->vmcb->save.dr7 = value;
2732
	mark_dirty(svm->vmcb, VMCB_DR);
A
Avi Kivity 已提交
2733 2734
}

A
Avi Kivity 已提交
2735
static int pf_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2736
{
2737
	u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
2738
	u64 error_code = svm->vmcb->control.exit_info_1;
A
Avi Kivity 已提交
2739

2740
	return kvm_handle_page_fault(&svm->vcpu, error_code, fault_address,
2741 2742
			static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
			svm->vmcb->control.insn_bytes : NULL,
2743 2744 2745 2746 2747
			svm->vmcb->control.insn_len);
}

static int npf_interception(struct vcpu_svm *svm)
{
2748
	u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
2749 2750 2751 2752
	u64 error_code = svm->vmcb->control.exit_info_1;

	trace_kvm_page_fault(fault_address, error_code);
	return kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code,
2753 2754
			static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
			svm->vmcb->control.insn_bytes : NULL,
2755
			svm->vmcb->control.insn_len);
A
Avi Kivity 已提交
2756 2757
}

A
Avi Kivity 已提交
2758
static int db_interception(struct vcpu_svm *svm)
J
Jan Kiszka 已提交
2759
{
A
Avi Kivity 已提交
2760
	struct kvm_run *kvm_run = svm->vcpu.run;
2761
	struct kvm_vcpu *vcpu = &svm->vcpu;
A
Avi Kivity 已提交
2762

J
Jan Kiszka 已提交
2763
	if (!(svm->vcpu.guest_debug &
2764
	      (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
J
Jan Kiszka 已提交
2765
		!svm->nmi_singlestep) {
J
Jan Kiszka 已提交
2766 2767 2768
		kvm_queue_exception(&svm->vcpu, DB_VECTOR);
		return 1;
	}
2769

J
Jan Kiszka 已提交
2770
	if (svm->nmi_singlestep) {
2771
		disable_nmi_singlestep(svm);
2772 2773
		/* Make sure we check for pending NMIs upon entry */
		kvm_make_request(KVM_REQ_EVENT, vcpu);
2774 2775 2776
	}

	if (svm->vcpu.guest_debug &
J
Joerg Roedel 已提交
2777
	    (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
2778 2779 2780 2781 2782 2783 2784 2785
		kvm_run->exit_reason = KVM_EXIT_DEBUG;
		kvm_run->debug.arch.pc =
			svm->vmcb->save.cs.base + svm->vmcb->save.rip;
		kvm_run->debug.arch.exception = DB_VECTOR;
		return 0;
	}

	return 1;
J
Jan Kiszka 已提交
2786 2787
}

A
Avi Kivity 已提交
2788
static int bp_interception(struct vcpu_svm *svm)
J
Jan Kiszka 已提交
2789
{
A
Avi Kivity 已提交
2790 2791
	struct kvm_run *kvm_run = svm->vcpu.run;

J
Jan Kiszka 已提交
2792 2793 2794 2795 2796 2797
	kvm_run->exit_reason = KVM_EXIT_DEBUG;
	kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
	kvm_run->debug.arch.exception = BP_VECTOR;
	return 0;
}

A
Avi Kivity 已提交
2798
static int ud_interception(struct vcpu_svm *svm)
2799
{
W
Wanpeng Li 已提交
2800
	return handle_ud(&svm->vcpu);
2801 2802
}

2803 2804 2805 2806 2807 2808
static int ac_interception(struct vcpu_svm *svm)
{
	kvm_queue_exception_e(&svm->vcpu, AC_VECTOR, 0);
	return 1;
}

2809 2810 2811 2812 2813 2814 2815
static int gp_interception(struct vcpu_svm *svm)
{
	struct kvm_vcpu *vcpu = &svm->vcpu;
	u32 error_code = svm->vmcb->control.exit_info_1;

	WARN_ON_ONCE(!enable_vmware_backdoor);

2816 2817 2818 2819 2820 2821 2822 2823
	/*
	 * VMware backdoor emulation on #GP interception only handles IN{S},
	 * OUT{S}, and RDPMC, none of which generate a non-zero error code.
	 */
	if (error_code) {
		kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
		return 1;
	}
2824
	return kvm_emulate_instruction(vcpu, EMULTYPE_VMWARE_GP);
2825 2826
}

2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865
static bool is_erratum_383(void)
{
	int err, i;
	u64 value;

	if (!erratum_383_found)
		return false;

	value = native_read_msr_safe(MSR_IA32_MC0_STATUS, &err);
	if (err)
		return false;

	/* Bit 62 may or may not be set for this mce */
	value &= ~(1ULL << 62);

	if (value != 0xb600000000010015ULL)
		return false;

	/* Clear MCi_STATUS registers */
	for (i = 0; i < 6; ++i)
		native_write_msr_safe(MSR_IA32_MCx_STATUS(i), 0, 0);

	value = native_read_msr_safe(MSR_IA32_MCG_STATUS, &err);
	if (!err) {
		u32 low, high;

		value &= ~(1ULL << 2);
		low    = lower_32_bits(value);
		high   = upper_32_bits(value);

		native_write_msr_safe(MSR_IA32_MCG_STATUS, low, high);
	}

	/* Flush tlb to evict multi-match entries */
	__flush_tlb_all();

	return true;
}

2866
static void svm_handle_mce(struct vcpu_svm *svm)
2867
{
2868 2869 2870 2871 2872 2873 2874
	if (is_erratum_383()) {
		/*
		 * Erratum 383 triggered. Guest state is corrupt so kill the
		 * guest.
		 */
		pr_err("KVM: Guest triggered AMD Erratum 383\n");

2875
		kvm_make_request(KVM_REQ_TRIPLE_FAULT, &svm->vcpu);
2876 2877 2878 2879

		return;
	}

2880 2881 2882 2883 2884 2885 2886 2887
	/*
	 * On an #MC intercept the MCE handler is not called automatically in
	 * the host. So do it by hand here.
	 */
	asm volatile (
		"int $0x12\n");
	/* not sure if we ever come back to this point */

2888 2889 2890 2891 2892
	return;
}

static int mc_interception(struct vcpu_svm *svm)
{
2893 2894 2895
	return 1;
}

A
Avi Kivity 已提交
2896
static int shutdown_interception(struct vcpu_svm *svm)
2897
{
A
Avi Kivity 已提交
2898 2899
	struct kvm_run *kvm_run = svm->vcpu.run;

2900 2901 2902 2903
	/*
	 * VMCB is undefined after a SHUTDOWN intercept
	 * so reinitialize it.
	 */
2904
	clear_page(svm->vmcb);
P
Paolo Bonzini 已提交
2905
	init_vmcb(svm);
2906 2907 2908 2909 2910

	kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
	return 0;
}

A
Avi Kivity 已提交
2911
static int io_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2912
{
2913
	struct kvm_vcpu *vcpu = &svm->vcpu;
M
Mike Day 已提交
2914
	u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
2915
	int size, in, string;
2916
	unsigned port;
A
Avi Kivity 已提交
2917

R
Rusty Russell 已提交
2918
	++svm->vcpu.stat.io_exits;
2919
	string = (io_info & SVM_IOIO_STR_MASK) != 0;
2920
	in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
2921
	if (string)
2922
		return kvm_emulate_instruction(vcpu, 0);
2923

2924 2925
	port = io_info >> 16;
	size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
2926 2927
	svm->next_rip = svm->vmcb->control.exit_info_2;

2928
	return kvm_fast_pio(&svm->vcpu, size, port, in);
A
Avi Kivity 已提交
2929 2930
}

A
Avi Kivity 已提交
2931
static int nmi_interception(struct vcpu_svm *svm)
2932 2933 2934 2935
{
	return 1;
}

A
Avi Kivity 已提交
2936
static int intr_interception(struct vcpu_svm *svm)
2937 2938 2939 2940 2941
{
	++svm->vcpu.stat.irq_exits;
	return 1;
}

A
Avi Kivity 已提交
2942
static int nop_on_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2943 2944 2945 2946
{
	return 1;
}

A
Avi Kivity 已提交
2947
static int halt_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2948
{
R
Rusty Russell 已提交
2949
	return kvm_emulate_halt(&svm->vcpu);
A
Avi Kivity 已提交
2950 2951
}

A
Avi Kivity 已提交
2952
static int vmmcall_interception(struct vcpu_svm *svm)
2953
{
2954
	return kvm_emulate_hypercall(&svm->vcpu);
2955 2956
}

2957 2958 2959 2960 2961 2962 2963
static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	return svm->nested.nested_cr3;
}

2964 2965 2966 2967 2968 2969 2970
static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 cr3 = svm->nested.nested_cr3;
	u64 pdpte;
	int ret;

2971
	ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(__sme_clr(cr3)), &pdpte,
2972
				       offset_in_page(cr3) + index * 8, 8);
2973 2974 2975 2976 2977
	if (ret)
		return 0;
	return pdpte;
}

2978 2979 2980 2981 2982
static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,
				   unsigned long root)
{
	struct vcpu_svm *svm = to_svm(vcpu);

2983
	svm->vmcb->control.nested_cr3 = __sme_set(root);
2984
	mark_dirty(svm->vmcb, VMCB_NPT);
2985 2986
}

2987 2988
static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
				       struct x86_exception *fault)
2989 2990 2991
{
	struct vcpu_svm *svm = to_svm(vcpu);

2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011
	if (svm->vmcb->control.exit_code != SVM_EXIT_NPF) {
		/*
		 * TODO: track the cause of the nested page fault, and
		 * correctly fill in the high bits of exit_info_1.
		 */
		svm->vmcb->control.exit_code = SVM_EXIT_NPF;
		svm->vmcb->control.exit_code_hi = 0;
		svm->vmcb->control.exit_info_1 = (1ULL << 32);
		svm->vmcb->control.exit_info_2 = fault->address;
	}

	svm->vmcb->control.exit_info_1 &= ~0xffffffffULL;
	svm->vmcb->control.exit_info_1 |= fault->error_code;

	/*
	 * The present bit is always zero for page structure faults on real
	 * hardware.
	 */
	if (svm->vmcb->control.exit_info_1 & (2ULL << 32))
		svm->vmcb->control.exit_info_1 &= ~1;
3012 3013 3014 3015

	nested_svm_vmexit(svm);
}

3016
static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
3017
{
3018
	WARN_ON(mmu_is_nested(vcpu));
3019 3020

	vcpu->arch.mmu = &vcpu->arch.guest_mmu;
3021
	kvm_init_shadow_mmu(vcpu);
3022 3023 3024 3025 3026 3027
	vcpu->arch.mmu->set_cr3           = nested_svm_set_tdp_cr3;
	vcpu->arch.mmu->get_cr3           = nested_svm_get_tdp_cr3;
	vcpu->arch.mmu->get_pdptr         = nested_svm_get_tdp_pdptr;
	vcpu->arch.mmu->inject_page_fault = nested_svm_inject_npf_exit;
	vcpu->arch.mmu->shadow_root_level = get_npt_level(vcpu);
	reset_shadow_zero_bits_mask(vcpu, vcpu->arch.mmu);
3028 3029 3030 3031 3032
	vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
}

static void nested_svm_uninit_mmu_context(struct kvm_vcpu *vcpu)
{
3033
	vcpu->arch.mmu = &vcpu->arch.root_mmu;
3034
	vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
3035 3036
}

3037 3038
static int nested_svm_check_permissions(struct vcpu_svm *svm)
{
3039 3040
	if (!(svm->vcpu.arch.efer & EFER_SVME) ||
	    !is_paging(&svm->vcpu)) {
3041 3042 3043 3044 3045 3046 3047 3048 3049
		kvm_queue_exception(&svm->vcpu, UD_VECTOR);
		return 1;
	}

	if (svm->vmcb->save.cpl) {
		kvm_inject_gp(&svm->vcpu, 0);
		return 1;
	}

3050
	return 0;
3051 3052
}

3053 3054 3055
static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
				      bool has_error_code, u32 error_code)
{
3056 3057
	int vmexit;

3058
	if (!is_guest_mode(&svm->vcpu))
3059
		return 0;
3060

3061 3062 3063 3064
	vmexit = nested_svm_intercept(svm);
	if (vmexit != NESTED_EXIT_DONE)
		return 0;

3065 3066 3067
	svm->vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + nr;
	svm->vmcb->control.exit_code_hi = 0;
	svm->vmcb->control.exit_info_1 = error_code;
3068 3069

	/*
3070 3071
	 * EXITINFO2 is undefined for all exception intercepts other
	 * than #PF.
3072
	 */
3073 3074
	if (svm->vcpu.arch.exception.nested_apf)
		svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
3075 3076
	else if (svm->vcpu.arch.exception.has_payload)
		svm->vmcb->control.exit_info_2 = svm->vcpu.arch.exception.payload;
3077 3078
	else
		svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
3079

3080
	svm->nested.exit_required = true;
3081
	return vmexit;
3082 3083
}

3084 3085
/* This function returns true if it is save to enable the irq window */
static inline bool nested_svm_intr(struct vcpu_svm *svm)
3086
{
3087
	if (!is_guest_mode(&svm->vcpu))
3088
		return true;
3089

3090
	if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
3091
		return true;
3092

3093
	if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
3094
		return false;
3095

3096 3097 3098 3099 3100 3101 3102 3103
	/*
	 * if vmexit was already requested (by intercepted exception
	 * for instance) do not overwrite it with "external interrupt"
	 * vmexit.
	 */
	if (svm->nested.exit_required)
		return false;

3104 3105 3106
	svm->vmcb->control.exit_code   = SVM_EXIT_INTR;
	svm->vmcb->control.exit_info_1 = 0;
	svm->vmcb->control.exit_info_2 = 0;
3107

3108 3109 3110
	if (svm->nested.intercept & 1ULL) {
		/*
		 * The #vmexit can't be emulated here directly because this
G
Guo Chao 已提交
3111
		 * code path runs with irqs and preemption disabled. A
3112 3113 3114 3115
		 * #vmexit emulation might sleep. Only signal request for
		 * the #vmexit here.
		 */
		svm->nested.exit_required = true;
3116
		trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
3117
		return false;
3118 3119
	}

3120
	return true;
3121 3122
}

3123 3124 3125
/* This function returns true if it is save to enable the nmi window */
static inline bool nested_svm_nmi(struct vcpu_svm *svm)
{
3126
	if (!is_guest_mode(&svm->vcpu))
3127 3128 3129 3130 3131 3132 3133 3134 3135
		return true;

	if (!(svm->nested.intercept & (1ULL << INTERCEPT_NMI)))
		return true;

	svm->vmcb->control.exit_code = SVM_EXIT_NMI;
	svm->nested.exit_required = true;

	return false;
3136 3137
}

3138 3139
static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
{
3140 3141 3142
	unsigned port, size, iopm_len;
	u16 val, mask;
	u8 start_bit;
3143
	u64 gpa;
3144

3145 3146
	if (!(svm->nested.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
		return NESTED_EXIT_HOST;
3147

3148
	port = svm->vmcb->control.exit_info_1 >> 16;
3149 3150
	size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
		SVM_IOIO_SIZE_SHIFT;
3151
	gpa  = svm->nested.vmcb_iopm + (port / 8);
3152 3153 3154 3155
	start_bit = port % 8;
	iopm_len = (start_bit + size > 8) ? 2 : 1;
	mask = (0xf >> (4 - size)) << start_bit;
	val = 0;
3156

3157
	if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
3158
		return NESTED_EXIT_DONE;
3159

3160
	return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
3161 3162
}

3163
static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
3164
{
3165 3166
	u32 offset, msr, value;
	int write, mask;
3167

3168
	if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
3169
		return NESTED_EXIT_HOST;
3170

3171 3172 3173 3174
	msr    = svm->vcpu.arch.regs[VCPU_REGS_RCX];
	offset = svm_msrpm_offset(msr);
	write  = svm->vmcb->control.exit_info_1 & 1;
	mask   = 1 << ((2 * (msr & 0xf)) + write);
3175

3176 3177
	if (offset == MSR_INVALID)
		return NESTED_EXIT_DONE;
3178

3179 3180
	/* Offset is in 32 bit units but need in 8 bit units */
	offset *= 4;
3181

3182
	if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.vmcb_msrpm + offset, &value, 4))
3183
		return NESTED_EXIT_DONE;
3184

3185
	return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
3186 3187
}

3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212
/* DB exceptions for our internal use must not cause vmexit */
static int nested_svm_intercept_db(struct vcpu_svm *svm)
{
	unsigned long dr6;

	/* if we're not singlestepping, it's not ours */
	if (!svm->nmi_singlestep)
		return NESTED_EXIT_DONE;

	/* if it's not a singlestep exception, it's not ours */
	if (kvm_get_dr(&svm->vcpu, 6, &dr6))
		return NESTED_EXIT_DONE;
	if (!(dr6 & DR6_BS))
		return NESTED_EXIT_DONE;

	/* if the guest is singlestepping, it should get the vmexit */
	if (svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF) {
		disable_nmi_singlestep(svm);
		return NESTED_EXIT_DONE;
	}

	/* it's ours, the nested hypervisor must not see this one */
	return NESTED_EXIT_HOST;
}

3213
static int nested_svm_exit_special(struct vcpu_svm *svm)
3214 3215
{
	u32 exit_code = svm->vmcb->control.exit_code;
3216

3217 3218 3219
	switch (exit_code) {
	case SVM_EXIT_INTR:
	case SVM_EXIT_NMI:
3220
	case SVM_EXIT_EXCP_BASE + MC_VECTOR:
3221 3222
		return NESTED_EXIT_HOST;
	case SVM_EXIT_NPF:
J
Joerg Roedel 已提交
3223
		/* For now we are always handling NPFs when using them */
3224 3225 3226 3227
		if (npt_enabled)
			return NESTED_EXIT_HOST;
		break;
	case SVM_EXIT_EXCP_BASE + PF_VECTOR:
G
Gleb Natapov 已提交
3228
		/* When we're shadowing, trap PFs, but not async PF */
3229
		if (!npt_enabled && svm->vcpu.arch.apf.host_apf_reason == 0)
3230 3231 3232 3233
			return NESTED_EXIT_HOST;
		break;
	default:
		break;
3234 3235
	}

3236 3237 3238 3239 3240 3241
	return NESTED_EXIT_CONTINUE;
}

/*
 * If this function returns true, this #vmexit was already handled
 */
3242
static int nested_svm_intercept(struct vcpu_svm *svm)
3243 3244 3245 3246
{
	u32 exit_code = svm->vmcb->control.exit_code;
	int vmexit = NESTED_EXIT_HOST;

3247
	switch (exit_code) {
3248
	case SVM_EXIT_MSR:
3249
		vmexit = nested_svm_exit_handled_msr(svm);
3250
		break;
3251 3252 3253
	case SVM_EXIT_IOIO:
		vmexit = nested_svm_intercept_ioio(svm);
		break;
3254 3255 3256
	case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
		u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0);
		if (svm->nested.intercept_cr & bit)
3257
			vmexit = NESTED_EXIT_DONE;
3258 3259
		break;
	}
3260 3261 3262
	case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
		u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
		if (svm->nested.intercept_dr & bit)
3263
			vmexit = NESTED_EXIT_DONE;
3264 3265 3266 3267
		break;
	}
	case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
		u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
3268 3269 3270 3271 3272 3273
		if (svm->nested.intercept_exceptions & excp_bits) {
			if (exit_code == SVM_EXIT_EXCP_BASE + DB_VECTOR)
				vmexit = nested_svm_intercept_db(svm);
			else
				vmexit = NESTED_EXIT_DONE;
		}
G
Gleb Natapov 已提交
3274 3275
		/* async page fault always cause vmexit */
		else if ((exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR) &&
3276
			 svm->vcpu.arch.exception.nested_apf != 0)
G
Gleb Natapov 已提交
3277
			vmexit = NESTED_EXIT_DONE;
3278 3279
		break;
	}
3280 3281 3282 3283
	case SVM_EXIT_ERR: {
		vmexit = NESTED_EXIT_DONE;
		break;
	}
3284 3285
	default: {
		u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
J
Joerg Roedel 已提交
3286
		if (svm->nested.intercept & exit_bits)
3287
			vmexit = NESTED_EXIT_DONE;
3288 3289 3290
	}
	}

3291 3292 3293 3294 3295 3296 3297 3298 3299 3300
	return vmexit;
}

static int nested_svm_exit_handled(struct vcpu_svm *svm)
{
	int vmexit;

	vmexit = nested_svm_intercept(svm);

	if (vmexit == NESTED_EXIT_DONE)
3301 3302 3303
		nested_svm_vmexit(svm);

	return vmexit;
3304 3305
}

3306 3307 3308 3309 3310
static inline void copy_vmcb_control_area(struct vmcb *dst_vmcb, struct vmcb *from_vmcb)
{
	struct vmcb_control_area *dst  = &dst_vmcb->control;
	struct vmcb_control_area *from = &from_vmcb->control;

3311
	dst->intercept_cr         = from->intercept_cr;
3312
	dst->intercept_dr         = from->intercept_dr;
3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 3332
	dst->intercept_exceptions = from->intercept_exceptions;
	dst->intercept            = from->intercept;
	dst->iopm_base_pa         = from->iopm_base_pa;
	dst->msrpm_base_pa        = from->msrpm_base_pa;
	dst->tsc_offset           = from->tsc_offset;
	dst->asid                 = from->asid;
	dst->tlb_ctl              = from->tlb_ctl;
	dst->int_ctl              = from->int_ctl;
	dst->int_vector           = from->int_vector;
	dst->int_state            = from->int_state;
	dst->exit_code            = from->exit_code;
	dst->exit_code_hi         = from->exit_code_hi;
	dst->exit_info_1          = from->exit_info_1;
	dst->exit_info_2          = from->exit_info_2;
	dst->exit_int_info        = from->exit_int_info;
	dst->exit_int_info_err    = from->exit_int_info_err;
	dst->nested_ctl           = from->nested_ctl;
	dst->event_inj            = from->event_inj;
	dst->event_inj_err        = from->event_inj_err;
	dst->nested_cr3           = from->nested_cr3;
3333
	dst->virt_ext              = from->virt_ext;
3334 3335
	dst->pause_filter_count   = from->pause_filter_count;
	dst->pause_filter_thresh  = from->pause_filter_thresh;
3336 3337
}

3338
static int nested_svm_vmexit(struct vcpu_svm *svm)
3339
{
3340
	int rc;
3341
	struct vmcb *nested_vmcb;
3342
	struct vmcb *hsave = svm->nested.hsave;
J
Joerg Roedel 已提交
3343
	struct vmcb *vmcb = svm->vmcb;
3344
	struct kvm_host_map map;
3345

3346 3347 3348 3349
	trace_kvm_nested_vmexit_inject(vmcb->control.exit_code,
				       vmcb->control.exit_info_1,
				       vmcb->control.exit_info_2,
				       vmcb->control.exit_int_info,
3350 3351
				       vmcb->control.exit_int_info_err,
				       KVM_ISA_SVM);
3352

3353
	rc = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->nested.vmcb), &map);
3354 3355 3356
	if (rc) {
		if (rc == -EINVAL)
			kvm_inject_gp(&svm->vcpu, 0);
3357
		return 1;
3358 3359 3360
	}

	nested_vmcb = map.hva;
3361

3362 3363
	/* Exit Guest-Mode */
	leave_guest_mode(&svm->vcpu);
3364 3365
	svm->nested.vmcb = 0;

3366
	/* Give the current vmcb to the guest */
J
Joerg Roedel 已提交
3367 3368 3369 3370 3371 3372 3373 3374
	disable_gif(svm);

	nested_vmcb->save.es     = vmcb->save.es;
	nested_vmcb->save.cs     = vmcb->save.cs;
	nested_vmcb->save.ss     = vmcb->save.ss;
	nested_vmcb->save.ds     = vmcb->save.ds;
	nested_vmcb->save.gdtr   = vmcb->save.gdtr;
	nested_vmcb->save.idtr   = vmcb->save.idtr;
3375
	nested_vmcb->save.efer   = svm->vcpu.arch.efer;
3376
	nested_vmcb->save.cr0    = kvm_read_cr0(&svm->vcpu);
3377
	nested_vmcb->save.cr3    = kvm_read_cr3(&svm->vcpu);
J
Joerg Roedel 已提交
3378
	nested_vmcb->save.cr2    = vmcb->save.cr2;
3379
	nested_vmcb->save.cr4    = svm->vcpu.arch.cr4;
3380
	nested_vmcb->save.rflags = kvm_get_rflags(&svm->vcpu);
J
Joerg Roedel 已提交
3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396
	nested_vmcb->save.rip    = vmcb->save.rip;
	nested_vmcb->save.rsp    = vmcb->save.rsp;
	nested_vmcb->save.rax    = vmcb->save.rax;
	nested_vmcb->save.dr7    = vmcb->save.dr7;
	nested_vmcb->save.dr6    = vmcb->save.dr6;
	nested_vmcb->save.cpl    = vmcb->save.cpl;

	nested_vmcb->control.int_ctl           = vmcb->control.int_ctl;
	nested_vmcb->control.int_vector        = vmcb->control.int_vector;
	nested_vmcb->control.int_state         = vmcb->control.int_state;
	nested_vmcb->control.exit_code         = vmcb->control.exit_code;
	nested_vmcb->control.exit_code_hi      = vmcb->control.exit_code_hi;
	nested_vmcb->control.exit_info_1       = vmcb->control.exit_info_1;
	nested_vmcb->control.exit_info_2       = vmcb->control.exit_info_2;
	nested_vmcb->control.exit_int_info     = vmcb->control.exit_int_info;
	nested_vmcb->control.exit_int_info_err = vmcb->control.exit_int_info_err;
3397 3398 3399

	if (svm->nrips_enabled)
		nested_vmcb->control.next_rip  = vmcb->control.next_rip;
3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415

	/*
	 * If we emulate a VMRUN/#VMEXIT in the same host #vmexit cycle we have
	 * to make sure that we do not lose injected events. So check event_inj
	 * here and copy it to exit_int_info if it is valid.
	 * Exit_int_info and event_inj can't be both valid because the case
	 * below only happens on a VMRUN instruction intercept which has
	 * no valid exit_int_info set.
	 */
	if (vmcb->control.event_inj & SVM_EVTINJ_VALID) {
		struct vmcb_control_area *nc = &nested_vmcb->control;

		nc->exit_int_info     = vmcb->control.event_inj;
		nc->exit_int_info_err = vmcb->control.event_inj_err;
	}

J
Joerg Roedel 已提交
3416 3417 3418
	nested_vmcb->control.tlb_ctl           = 0;
	nested_vmcb->control.event_inj         = 0;
	nested_vmcb->control.event_inj_err     = 0;
3419

3420 3421 3422 3423 3424
	nested_vmcb->control.pause_filter_count =
		svm->vmcb->control.pause_filter_count;
	nested_vmcb->control.pause_filter_thresh =
		svm->vmcb->control.pause_filter_thresh;

3425 3426 3427 3428 3429
	/* We always set V_INTR_MASKING and remember the old value in hflags */
	if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
		nested_vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;

	/* Restore the original control entries */
3430
	copy_vmcb_control_area(vmcb, hsave);
3431

3432
	svm->vcpu.arch.tsc_offset = svm->vmcb->control.tsc_offset;
3433 3434
	kvm_clear_exception_queue(&svm->vcpu);
	kvm_clear_interrupt_queue(&svm->vcpu);
3435

3436 3437
	svm->nested.nested_cr3 = 0;

3438 3439 3440 3441 3442 3443 3444
	/* Restore selected save entries */
	svm->vmcb->save.es = hsave->save.es;
	svm->vmcb->save.cs = hsave->save.cs;
	svm->vmcb->save.ss = hsave->save.ss;
	svm->vmcb->save.ds = hsave->save.ds;
	svm->vmcb->save.gdtr = hsave->save.gdtr;
	svm->vmcb->save.idtr = hsave->save.idtr;
3445
	kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
3446 3447 3448 3449 3450 3451 3452
	svm_set_efer(&svm->vcpu, hsave->save.efer);
	svm_set_cr0(&svm->vcpu, hsave->save.cr0 | X86_CR0_PE);
	svm_set_cr4(&svm->vcpu, hsave->save.cr4);
	if (npt_enabled) {
		svm->vmcb->save.cr3 = hsave->save.cr3;
		svm->vcpu.arch.cr3 = hsave->save.cr3;
	} else {
3453
		(void)kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
3454
	}
3455
	kvm_rax_write(&svm->vcpu, hsave->save.rax);
3456 3457
	kvm_rsp_write(&svm->vcpu, hsave->save.rsp);
	kvm_rip_write(&svm->vcpu, hsave->save.rip);
3458 3459 3460 3461
	svm->vmcb->save.dr7 = 0;
	svm->vmcb->save.cpl = 0;
	svm->vmcb->control.exit_int_info = 0;

3462 3463
	mark_all_dirty(svm->vmcb);

3464
	kvm_vcpu_unmap(&svm->vcpu, &map, true);
3465

3466
	nested_svm_uninit_mmu_context(&svm->vcpu);
3467 3468 3469
	kvm_mmu_reset_context(&svm->vcpu);
	kvm_mmu_load(&svm->vcpu);

3470 3471 3472 3473 3474 3475 3476 3477
	/*
	 * Drop what we picked up for L2 via svm_complete_interrupts() so it
	 * doesn't end up in L1.
	 */
	svm->vcpu.arch.nmi_injected = false;
	kvm_clear_exception_queue(&svm->vcpu);
	kvm_clear_interrupt_queue(&svm->vcpu);

3478 3479
	return 0;
}
A
Alexander Graf 已提交
3480

3481
static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
A
Alexander Graf 已提交
3482
{
3483 3484
	/*
	 * This function merges the msr permission bitmaps of kvm and the
G
Guo Chao 已提交
3485
	 * nested vmcb. It is optimized in that it only merges the parts where
3486 3487
	 * the kvm msr permission bitmap may contain zero bits
	 */
A
Alexander Graf 已提交
3488
	int i;
3489

3490 3491
	if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
		return true;
3492

3493 3494 3495
	for (i = 0; i < MSRPM_OFFSETS; i++) {
		u32 value, p;
		u64 offset;
3496

3497 3498
		if (msrpm_offsets[i] == 0xffffffff)
			break;
A
Alexander Graf 已提交
3499

3500 3501
		p      = msrpm_offsets[i];
		offset = svm->nested.vmcb_msrpm + (p * 4);
3502

3503
		if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
3504 3505 3506 3507
			return false;

		svm->nested.msrpm[p] = svm->msrpm[p] | value;
	}
A
Alexander Graf 已提交
3508

3509
	svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm));
3510 3511

	return true;
A
Alexander Graf 已提交
3512 3513
}

3514 3515 3516 3517 3518
static bool nested_vmcb_checks(struct vmcb *vmcb)
{
	if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
		return false;

3519 3520 3521
	if (vmcb->control.asid == 0)
		return false;

3522 3523
	if ((vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) &&
	    !npt_enabled)
3524 3525
		return false;

3526 3527 3528
	return true;
}

L
Ladi Prosek 已提交
3529
static void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
3530
				 struct vmcb *nested_vmcb, struct kvm_host_map *map)
A
Alexander Graf 已提交
3531
{
3532
	if (kvm_get_rflags(&svm->vcpu) & X86_EFLAGS_IF)
A
Alexander Graf 已提交
3533 3534 3535 3536
		svm->vcpu.arch.hflags |= HF_HIF_MASK;
	else
		svm->vcpu.arch.hflags &= ~HF_HIF_MASK;

3537
	if (nested_vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) {
3538 3539 3540 3541
		svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
		nested_svm_init_mmu_context(&svm->vcpu);
	}

A
Alexander Graf 已提交
3542 3543 3544 3545 3546 3547 3548
	/* Load the nested guest state */
	svm->vmcb->save.es = nested_vmcb->save.es;
	svm->vmcb->save.cs = nested_vmcb->save.cs;
	svm->vmcb->save.ss = nested_vmcb->save.ss;
	svm->vmcb->save.ds = nested_vmcb->save.ds;
	svm->vmcb->save.gdtr = nested_vmcb->save.gdtr;
	svm->vmcb->save.idtr = nested_vmcb->save.idtr;
3549
	kvm_set_rflags(&svm->vcpu, nested_vmcb->save.rflags);
A
Alexander Graf 已提交
3550 3551 3552 3553 3554 3555
	svm_set_efer(&svm->vcpu, nested_vmcb->save.efer);
	svm_set_cr0(&svm->vcpu, nested_vmcb->save.cr0);
	svm_set_cr4(&svm->vcpu, nested_vmcb->save.cr4);
	if (npt_enabled) {
		svm->vmcb->save.cr3 = nested_vmcb->save.cr3;
		svm->vcpu.arch.cr3 = nested_vmcb->save.cr3;
3556
	} else
3557
		(void)kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
3558 3559 3560 3561

	/* Guest paging mode is active - reset mmu */
	kvm_mmu_reset_context(&svm->vcpu);

J
Joerg Roedel 已提交
3562
	svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
3563
	kvm_rax_write(&svm->vcpu, nested_vmcb->save.rax);
3564 3565
	kvm_rsp_write(&svm->vcpu, nested_vmcb->save.rsp);
	kvm_rip_write(&svm->vcpu, nested_vmcb->save.rip);
J
Joerg Roedel 已提交
3566

A
Alexander Graf 已提交
3567 3568 3569 3570 3571 3572 3573 3574
	/* In case we don't even reach vcpu_run, the fields are not updated */
	svm->vmcb->save.rax = nested_vmcb->save.rax;
	svm->vmcb->save.rsp = nested_vmcb->save.rsp;
	svm->vmcb->save.rip = nested_vmcb->save.rip;
	svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
	svm->vmcb->save.dr6 = nested_vmcb->save.dr6;
	svm->vmcb->save.cpl = nested_vmcb->save.cpl;

3575
	svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
3576
	svm->nested.vmcb_iopm  = nested_vmcb->control.iopm_base_pa  & ~0x0fffULL;
A
Alexander Graf 已提交
3577

J
Joerg Roedel 已提交
3578
	/* cache intercepts */
3579
	svm->nested.intercept_cr         = nested_vmcb->control.intercept_cr;
3580
	svm->nested.intercept_dr         = nested_vmcb->control.intercept_dr;
J
Joerg Roedel 已提交
3581 3582 3583
	svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
	svm->nested.intercept            = nested_vmcb->control.intercept;

3584
	svm_flush_tlb(&svm->vcpu, true);
A
Alexander Graf 已提交
3585 3586 3587 3588 3589 3590
	svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
	if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
		svm->vcpu.arch.hflags |= HF_VINTR_MASK;
	else
		svm->vcpu.arch.hflags &= ~HF_VINTR_MASK;

3591 3592
	if (svm->vcpu.arch.hflags & HF_VINTR_MASK) {
		/* We only want the cr8 intercept bits of the guest */
3593 3594
		clr_cr_intercept(svm, INTERCEPT_CR8_READ);
		clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);
3595 3596
	}

3597
	/* We don't want to see VMMCALLs from a nested guest */
3598
	clr_intercept(svm, INTERCEPT_VMMCALL);
3599

3600 3601 3602
	svm->vcpu.arch.tsc_offset += nested_vmcb->control.tsc_offset;
	svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset;

3603
	svm->vmcb->control.virt_ext = nested_vmcb->control.virt_ext;
A
Alexander Graf 已提交
3604 3605 3606 3607 3608
	svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
	svm->vmcb->control.int_state = nested_vmcb->control.int_state;
	svm->vmcb->control.event_inj = nested_vmcb->control.event_inj;
	svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err;

3609 3610 3611 3612 3613
	svm->vmcb->control.pause_filter_count =
		nested_vmcb->control.pause_filter_count;
	svm->vmcb->control.pause_filter_thresh =
		nested_vmcb->control.pause_filter_thresh;

3614
	kvm_vcpu_unmap(&svm->vcpu, map, true);
3615

3616 3617 3618
	/* Enter Guest-Mode */
	enter_guest_mode(&svm->vcpu);

3619 3620 3621 3622 3623 3624
	/*
	 * Merge guest and host intercepts - must be called  with vcpu in
	 * guest-mode to take affect here
	 */
	recalc_intercepts(svm);

3625
	svm->nested.vmcb = vmcb_gpa;
3626

3627
	enable_gif(svm);
A
Alexander Graf 已提交
3628

3629
	mark_all_dirty(svm->vmcb);
L
Ladi Prosek 已提交
3630 3631
}

3632
static int nested_svm_vmrun(struct vcpu_svm *svm)
L
Ladi Prosek 已提交
3633
{
3634
	int ret;
L
Ladi Prosek 已提交
3635 3636 3637
	struct vmcb *nested_vmcb;
	struct vmcb *hsave = svm->nested.hsave;
	struct vmcb *vmcb = svm->vmcb;
3638
	struct kvm_host_map map;
L
Ladi Prosek 已提交
3639 3640 3641 3642
	u64 vmcb_gpa;

	vmcb_gpa = svm->vmcb->save.rax;

3643
	ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map);
3644
	if (ret == -EINVAL) {
3645
		kvm_inject_gp(&svm->vcpu, 0);
3646
		return 1;
3647 3648
	} else if (ret) {
		return kvm_skip_emulated_instruction(&svm->vcpu);
3649 3650
	}

3651 3652
	ret = kvm_skip_emulated_instruction(&svm->vcpu);

3653
	nested_vmcb = map.hva;
L
Ladi Prosek 已提交
3654 3655 3656 3657 3658 3659 3660

	if (!nested_vmcb_checks(nested_vmcb)) {
		nested_vmcb->control.exit_code    = SVM_EXIT_ERR;
		nested_vmcb->control.exit_code_hi = 0;
		nested_vmcb->control.exit_info_1  = 0;
		nested_vmcb->control.exit_info_2  = 0;

3661
		kvm_vcpu_unmap(&svm->vcpu, &map, true);
L
Ladi Prosek 已提交
3662

3663
		return ret;
L
Ladi Prosek 已提交
3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704
	}

	trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
			       nested_vmcb->save.rip,
			       nested_vmcb->control.int_ctl,
			       nested_vmcb->control.event_inj,
			       nested_vmcb->control.nested_ctl);

	trace_kvm_nested_intercepts(nested_vmcb->control.intercept_cr & 0xffff,
				    nested_vmcb->control.intercept_cr >> 16,
				    nested_vmcb->control.intercept_exceptions,
				    nested_vmcb->control.intercept);

	/* Clear internal status */
	kvm_clear_exception_queue(&svm->vcpu);
	kvm_clear_interrupt_queue(&svm->vcpu);

	/*
	 * Save the old vmcb, so we don't need to pick what we save, but can
	 * restore everything when a VMEXIT occurs
	 */
	hsave->save.es     = vmcb->save.es;
	hsave->save.cs     = vmcb->save.cs;
	hsave->save.ss     = vmcb->save.ss;
	hsave->save.ds     = vmcb->save.ds;
	hsave->save.gdtr   = vmcb->save.gdtr;
	hsave->save.idtr   = vmcb->save.idtr;
	hsave->save.efer   = svm->vcpu.arch.efer;
	hsave->save.cr0    = kvm_read_cr0(&svm->vcpu);
	hsave->save.cr4    = svm->vcpu.arch.cr4;
	hsave->save.rflags = kvm_get_rflags(&svm->vcpu);
	hsave->save.rip    = kvm_rip_read(&svm->vcpu);
	hsave->save.rsp    = vmcb->save.rsp;
	hsave->save.rax    = vmcb->save.rax;
	if (npt_enabled)
		hsave->save.cr3    = vmcb->save.cr3;
	else
		hsave->save.cr3    = kvm_read_cr3(&svm->vcpu);

	copy_vmcb_control_area(hsave, vmcb);

3705
	enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb, &map);
3706

3707 3708 3709 3710 3711 3712 3713 3714 3715
	if (!nested_svm_vmrun_msrpm(svm)) {
		svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
		svm->vmcb->control.exit_code_hi = 0;
		svm->vmcb->control.exit_info_1  = 0;
		svm->vmcb->control.exit_info_2  = 0;

		nested_svm_vmexit(svm);
	}

3716
	return ret;
A
Alexander Graf 已提交
3717 3718
}

3719
static void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734
{
	to_vmcb->save.fs = from_vmcb->save.fs;
	to_vmcb->save.gs = from_vmcb->save.gs;
	to_vmcb->save.tr = from_vmcb->save.tr;
	to_vmcb->save.ldtr = from_vmcb->save.ldtr;
	to_vmcb->save.kernel_gs_base = from_vmcb->save.kernel_gs_base;
	to_vmcb->save.star = from_vmcb->save.star;
	to_vmcb->save.lstar = from_vmcb->save.lstar;
	to_vmcb->save.cstar = from_vmcb->save.cstar;
	to_vmcb->save.sfmask = from_vmcb->save.sfmask;
	to_vmcb->save.sysenter_cs = from_vmcb->save.sysenter_cs;
	to_vmcb->save.sysenter_esp = from_vmcb->save.sysenter_esp;
	to_vmcb->save.sysenter_eip = from_vmcb->save.sysenter_eip;
}

A
Avi Kivity 已提交
3735
static int vmload_interception(struct vcpu_svm *svm)
3736
{
3737
	struct vmcb *nested_vmcb;
3738
	struct kvm_host_map map;
3739
	int ret;
3740

3741 3742 3743
	if (nested_svm_check_permissions(svm))
		return 1;

3744 3745 3746 3747
	ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->vmcb->save.rax), &map);
	if (ret) {
		if (ret == -EINVAL)
			kvm_inject_gp(&svm->vcpu, 0);
3748
		return 1;
3749 3750 3751
	}

	nested_vmcb = map.hva;
3752

3753
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3754

3755
	nested_svm_vmloadsave(nested_vmcb, svm->vmcb);
3756
	kvm_vcpu_unmap(&svm->vcpu, &map, true);
3757

3758
	return ret;
3759 3760
}

A
Avi Kivity 已提交
3761
static int vmsave_interception(struct vcpu_svm *svm)
3762
{
3763
	struct vmcb *nested_vmcb;
3764
	struct kvm_host_map map;
3765
	int ret;
3766

3767 3768 3769
	if (nested_svm_check_permissions(svm))
		return 1;

3770 3771 3772 3773
	ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(svm->vmcb->save.rax), &map);
	if (ret) {
		if (ret == -EINVAL)
			kvm_inject_gp(&svm->vcpu, 0);
3774
		return 1;
3775 3776 3777
	}

	nested_vmcb = map.hva;
3778

3779
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3780

3781
	nested_svm_vmloadsave(svm->vmcb, nested_vmcb);
3782
	kvm_vcpu_unmap(&svm->vcpu, &map, true);
3783

3784
	return ret;
3785 3786
}

A
Avi Kivity 已提交
3787
static int vmrun_interception(struct vcpu_svm *svm)
A
Alexander Graf 已提交
3788 3789 3790 3791
{
	if (nested_svm_check_permissions(svm))
		return 1;

3792
	return nested_svm_vmrun(svm);
A
Alexander Graf 已提交
3793 3794
}

A
Avi Kivity 已提交
3795
static int stgi_interception(struct vcpu_svm *svm)
3796
{
3797 3798
	int ret;

3799 3800 3801
	if (nested_svm_check_permissions(svm))
		return 1;

3802 3803
	/*
	 * If VGIF is enabled, the STGI intercept is only added to
3804
	 * detect the opening of the SMI/NMI window; remove it now.
3805 3806 3807 3808
	 */
	if (vgif_enabled(svm))
		clr_intercept(svm, INTERCEPT_STGI);

3809
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3810
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3811

3812
	enable_gif(svm);
3813

3814
	return ret;
3815 3816
}

A
Avi Kivity 已提交
3817
static int clgi_interception(struct vcpu_svm *svm)
3818
{
3819 3820
	int ret;

3821 3822 3823
	if (nested_svm_check_permissions(svm))
		return 1;

3824
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3825

3826
	disable_gif(svm);
3827 3828

	/* After a CLGI no interrupts should come */
3829 3830 3831 3832 3833
	if (!kvm_vcpu_apicv_active(&svm->vcpu)) {
		svm_clear_vintr(svm);
		svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
		mark_dirty(svm->vmcb, VMCB_INTR);
	}
3834

3835
	return ret;
3836 3837
}

A
Avi Kivity 已提交
3838
static int invlpga_interception(struct vcpu_svm *svm)
A
Alexander Graf 已提交
3839 3840 3841
{
	struct kvm_vcpu *vcpu = &svm->vcpu;

3842 3843
	trace_kvm_invlpga(svm->vmcb->save.rip, kvm_rcx_read(&svm->vcpu),
			  kvm_rax_read(&svm->vcpu));
3844

A
Alexander Graf 已提交
3845
	/* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
3846
	kvm_mmu_invlpg(vcpu, kvm_rax_read(&svm->vcpu));
A
Alexander Graf 已提交
3847

3848
	return kvm_skip_emulated_instruction(&svm->vcpu);
A
Alexander Graf 已提交
3849 3850
}

3851 3852
static int skinit_interception(struct vcpu_svm *svm)
{
3853
	trace_kvm_skinit(svm->vmcb->save.rip, kvm_rax_read(&svm->vcpu));
3854 3855 3856 3857 3858

	kvm_queue_exception(&svm->vcpu, UD_VECTOR);
	return 1;
}

D
David Kaplan 已提交
3859 3860
static int wbinvd_interception(struct vcpu_svm *svm)
{
3861
	return kvm_emulate_wbinvd(&svm->vcpu);
D
David Kaplan 已提交
3862 3863
}

J
Joerg Roedel 已提交
3864 3865 3866
static int xsetbv_interception(struct vcpu_svm *svm)
{
	u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
3867
	u32 index = kvm_rcx_read(&svm->vcpu);
J
Joerg Roedel 已提交
3868 3869

	if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) {
3870
		return kvm_skip_emulated_instruction(&svm->vcpu);
J
Joerg Roedel 已提交
3871 3872 3873 3874 3875
	}

	return 1;
}

J
Jim Mattson 已提交
3876 3877 3878 3879 3880 3881
static int rdpru_interception(struct vcpu_svm *svm)
{
	kvm_queue_exception(&svm->vcpu, UD_VECTOR);
	return 1;
}

A
Avi Kivity 已提交
3882
static int task_switch_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3883
{
3884
	u16 tss_selector;
3885 3886 3887
	int reason;
	int int_type = svm->vmcb->control.exit_int_info &
		SVM_EXITINTINFO_TYPE_MASK;
3888
	int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
3889 3890 3891 3892
	uint32_t type =
		svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_TYPE_MASK;
	uint32_t idt_v =
		svm->vmcb->control.exit_int_info & SVM_EXITINTINFO_VALID;
3893 3894
	bool has_error_code = false;
	u32 error_code = 0;
3895 3896

	tss_selector = (u16)svm->vmcb->control.exit_info_1;
3897

3898 3899
	if (svm->vmcb->control.exit_info_2 &
	    (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
3900 3901 3902 3903
		reason = TASK_SWITCH_IRET;
	else if (svm->vmcb->control.exit_info_2 &
		 (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
		reason = TASK_SWITCH_JMP;
3904
	else if (idt_v)
3905 3906 3907 3908
		reason = TASK_SWITCH_GATE;
	else
		reason = TASK_SWITCH_CALL;

3909 3910 3911 3912 3913 3914
	if (reason == TASK_SWITCH_GATE) {
		switch (type) {
		case SVM_EXITINTINFO_TYPE_NMI:
			svm->vcpu.arch.nmi_injected = false;
			break;
		case SVM_EXITINTINFO_TYPE_EXEPT:
3915 3916 3917 3918 3919 3920
			if (svm->vmcb->control.exit_info_2 &
			    (1ULL << SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE)) {
				has_error_code = true;
				error_code =
					(u32)svm->vmcb->control.exit_info_2;
			}
3921 3922 3923 3924 3925 3926 3927 3928 3929
			kvm_clear_exception_queue(&svm->vcpu);
			break;
		case SVM_EXITINTINFO_TYPE_INTR:
			kvm_clear_interrupt_queue(&svm->vcpu);
			break;
		default:
			break;
		}
	}
3930

3931 3932 3933
	if (reason != TASK_SWITCH_GATE ||
	    int_type == SVM_EXITINTINFO_TYPE_SOFT ||
	    (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
3934
	     (int_vec == OF_VECTOR || int_vec == BP_VECTOR))) {
3935
		if (!skip_emulated_instruction(&svm->vcpu))
3936
			return 0;
3937
	}
3938

3939 3940 3941
	if (int_type != SVM_EXITINTINFO_TYPE_SOFT)
		int_vec = -1;

3942
	return kvm_task_switch(&svm->vcpu, tss_selector, int_vec, reason,
3943
			       has_error_code, error_code);
A
Avi Kivity 已提交
3944 3945
}

A
Avi Kivity 已提交
3946
static int cpuid_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3947
{
3948
	return kvm_emulate_cpuid(&svm->vcpu);
A
Avi Kivity 已提交
3949 3950
}

A
Avi Kivity 已提交
3951
static int iret_interception(struct vcpu_svm *svm)
3952 3953
{
	++svm->vcpu.stat.nmi_window_exits;
3954
	clr_intercept(svm, INTERCEPT_IRET);
3955
	svm->vcpu.arch.hflags |= HF_IRET_MASK;
3956
	svm->nmi_iret_rip = kvm_rip_read(&svm->vcpu);
3957
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3958 3959 3960
	return 1;
}

A
Avi Kivity 已提交
3961
static int invlpg_interception(struct vcpu_svm *svm)
M
Marcelo Tosatti 已提交
3962
{
3963
	if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
3964
		return kvm_emulate_instruction(&svm->vcpu, 0);
3965 3966

	kvm_mmu_invlpg(&svm->vcpu, svm->vmcb->control.exit_info_1);
3967
	return kvm_skip_emulated_instruction(&svm->vcpu);
M
Marcelo Tosatti 已提交
3968 3969
}

A
Avi Kivity 已提交
3970
static int emulate_on_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3971
{
3972
	return kvm_emulate_instruction(&svm->vcpu, 0);
A
Avi Kivity 已提交
3973 3974
}

B
Brijesh Singh 已提交
3975 3976
static int rsm_interception(struct vcpu_svm *svm)
{
3977
	return kvm_emulate_instruction_from_buffer(&svm->vcpu, rsm_ins_bytes, 2);
B
Brijesh Singh 已提交
3978 3979
}

A
Avi Kivity 已提交
3980 3981 3982 3983
static int rdpmc_interception(struct vcpu_svm *svm)
{
	int err;

3984
	if (!nrips)
A
Avi Kivity 已提交
3985 3986 3987
		return emulate_on_interception(svm);

	err = kvm_rdpmc(&svm->vcpu);
3988
	return kvm_complete_insn_gp(&svm->vcpu, err);
A
Avi Kivity 已提交
3989 3990
}

3991 3992
static bool check_selective_cr0_intercepted(struct vcpu_svm *svm,
					    unsigned long val)
3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014
{
	unsigned long cr0 = svm->vcpu.arch.cr0;
	bool ret = false;
	u64 intercept;

	intercept = svm->nested.intercept;

	if (!is_guest_mode(&svm->vcpu) ||
	    (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0))))
		return false;

	cr0 &= ~SVM_CR0_SELECTIVE_MASK;
	val &= ~SVM_CR0_SELECTIVE_MASK;

	if (cr0 ^ val) {
		svm->vmcb->control.exit_code = SVM_EXIT_CR0_SEL_WRITE;
		ret = (nested_svm_exit_handled(svm) == NESTED_EXIT_DONE);
	}

	return ret;
}

4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029
#define CR_VALID (1ULL << 63)

static int cr_interception(struct vcpu_svm *svm)
{
	int reg, cr;
	unsigned long val;
	int err;

	if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
		return emulate_on_interception(svm);

	if (unlikely((svm->vmcb->control.exit_info_1 & CR_VALID) == 0))
		return emulate_on_interception(svm);

	reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
4030 4031 4032 4033
	if (svm->vmcb->control.exit_code == SVM_EXIT_CR0_SEL_WRITE)
		cr = SVM_EXIT_WRITE_CR0 - SVM_EXIT_READ_CR0;
	else
		cr = svm->vmcb->control.exit_code - SVM_EXIT_READ_CR0;
4034 4035 4036 4037 4038 4039 4040

	err = 0;
	if (cr >= 16) { /* mov to cr */
		cr -= 16;
		val = kvm_register_read(&svm->vcpu, reg);
		switch (cr) {
		case 0:
4041 4042
			if (!check_selective_cr0_intercepted(svm, val))
				err = kvm_set_cr0(&svm->vcpu, val);
4043 4044 4045
			else
				return 1;

4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069
			break;
		case 3:
			err = kvm_set_cr3(&svm->vcpu, val);
			break;
		case 4:
			err = kvm_set_cr4(&svm->vcpu, val);
			break;
		case 8:
			err = kvm_set_cr8(&svm->vcpu, val);
			break;
		default:
			WARN(1, "unhandled write to CR%d", cr);
			kvm_queue_exception(&svm->vcpu, UD_VECTOR);
			return 1;
		}
	} else { /* mov from cr */
		switch (cr) {
		case 0:
			val = kvm_read_cr0(&svm->vcpu);
			break;
		case 2:
			val = svm->vcpu.arch.cr2;
			break;
		case 3:
4070
			val = kvm_read_cr3(&svm->vcpu);
4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084
			break;
		case 4:
			val = kvm_read_cr4(&svm->vcpu);
			break;
		case 8:
			val = kvm_get_cr8(&svm->vcpu);
			break;
		default:
			WARN(1, "unhandled read from CR%d", cr);
			kvm_queue_exception(&svm->vcpu, UD_VECTOR);
			return 1;
		}
		kvm_register_write(&svm->vcpu, reg, val);
	}
4085
	return kvm_complete_insn_gp(&svm->vcpu, err);
4086 4087
}

4088 4089 4090 4091 4092
static int dr_interception(struct vcpu_svm *svm)
{
	int reg, dr;
	unsigned long val;

4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103
	if (svm->vcpu.guest_debug == 0) {
		/*
		 * No more DR vmexits; force a reload of the debug registers
		 * and reenter on this instruction.  The next vmexit will
		 * retrieve the full state of the debug registers.
		 */
		clr_dr_intercepts(svm);
		svm->vcpu.arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT;
		return 1;
	}

4104 4105 4106 4107 4108 4109 4110
	if (!boot_cpu_has(X86_FEATURE_DECODEASSISTS))
		return emulate_on_interception(svm);

	reg = svm->vmcb->control.exit_info_1 & SVM_EXITINFO_REG_MASK;
	dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;

	if (dr >= 16) { /* mov to DRn */
4111 4112
		if (!kvm_require_dr(&svm->vcpu, dr - 16))
			return 1;
4113 4114 4115
		val = kvm_register_read(&svm->vcpu, reg);
		kvm_set_dr(&svm->vcpu, dr - 16, val);
	} else {
4116 4117 4118 4119
		if (!kvm_require_dr(&svm->vcpu, dr))
			return 1;
		kvm_get_dr(&svm->vcpu, dr, &val);
		kvm_register_write(&svm->vcpu, reg, val);
4120 4121
	}

4122
	return kvm_skip_emulated_instruction(&svm->vcpu);
4123 4124
}

A
Avi Kivity 已提交
4125
static int cr8_write_interception(struct vcpu_svm *svm)
4126
{
A
Avi Kivity 已提交
4127
	struct kvm_run *kvm_run = svm->vcpu.run;
A
Andre Przywara 已提交
4128
	int r;
A
Avi Kivity 已提交
4129

4130 4131
	u8 cr8_prev = kvm_get_cr8(&svm->vcpu);
	/* instruction emulation calls kvm_set_cr8() */
4132
	r = cr_interception(svm);
4133
	if (lapic_in_kernel(&svm->vcpu))
4134
		return r;
4135
	if (cr8_prev <= kvm_get_cr8(&svm->vcpu))
4136
		return r;
4137 4138 4139 4140
	kvm_run->exit_reason = KVM_EXIT_SET_TPR;
	return 0;
}

4141 4142
static int svm_get_msr_feature(struct kvm_msr_entry *msr)
{
4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154
	msr->data = 0;

	switch (msr->index) {
	case MSR_F10H_DECFG:
		if (boot_cpu_has(X86_FEATURE_LFENCE_RDTSC))
			msr->data |= MSR_F10H_DECFG_LFENCE_SERIALIZE;
		break;
	default:
		return 1;
	}

	return 0;
4155 4156
}

4157
static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
A
Avi Kivity 已提交
4158
{
4159 4160
	struct vcpu_svm *svm = to_svm(vcpu);

4161
	switch (msr_info->index) {
B
Brian Gerst 已提交
4162
	case MSR_STAR:
4163
		msr_info->data = svm->vmcb->save.star;
A
Avi Kivity 已提交
4164
		break;
4165
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
4166
	case MSR_LSTAR:
4167
		msr_info->data = svm->vmcb->save.lstar;
A
Avi Kivity 已提交
4168 4169
		break;
	case MSR_CSTAR:
4170
		msr_info->data = svm->vmcb->save.cstar;
A
Avi Kivity 已提交
4171 4172
		break;
	case MSR_KERNEL_GS_BASE:
4173
		msr_info->data = svm->vmcb->save.kernel_gs_base;
A
Avi Kivity 已提交
4174 4175
		break;
	case MSR_SYSCALL_MASK:
4176
		msr_info->data = svm->vmcb->save.sfmask;
A
Avi Kivity 已提交
4177 4178 4179
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
4180
		msr_info->data = svm->vmcb->save.sysenter_cs;
A
Avi Kivity 已提交
4181 4182
		break;
	case MSR_IA32_SYSENTER_EIP:
4183
		msr_info->data = svm->sysenter_eip;
A
Avi Kivity 已提交
4184 4185
		break;
	case MSR_IA32_SYSENTER_ESP:
4186
		msr_info->data = svm->sysenter_esp;
A
Avi Kivity 已提交
4187
		break;
P
Paolo Bonzini 已提交
4188 4189 4190 4191 4192
	case MSR_TSC_AUX:
		if (!boot_cpu_has(X86_FEATURE_RDTSCP))
			return 1;
		msr_info->data = svm->tsc_aux;
		break;
J
Joerg Roedel 已提交
4193 4194 4195 4196 4197
	/*
	 * Nobody will change the following 5 values in the VMCB so we can
	 * safely return them on rdmsr. They will always be 0 until LBRV is
	 * implemented.
	 */
4198
	case MSR_IA32_DEBUGCTLMSR:
4199
		msr_info->data = svm->vmcb->save.dbgctl;
4200 4201
		break;
	case MSR_IA32_LASTBRANCHFROMIP:
4202
		msr_info->data = svm->vmcb->save.br_from;
4203 4204
		break;
	case MSR_IA32_LASTBRANCHTOIP:
4205
		msr_info->data = svm->vmcb->save.br_to;
4206 4207
		break;
	case MSR_IA32_LASTINTFROMIP:
4208
		msr_info->data = svm->vmcb->save.last_excp_from;
4209 4210
		break;
	case MSR_IA32_LASTINTTOIP:
4211
		msr_info->data = svm->vmcb->save.last_excp_to;
4212
		break;
A
Alexander Graf 已提交
4213
	case MSR_VM_HSAVE_PA:
4214
		msr_info->data = svm->nested.hsave_msr;
A
Alexander Graf 已提交
4215
		break;
4216
	case MSR_VM_CR:
4217
		msr_info->data = svm->nested.vm_cr_msr;
4218
		break;
4219 4220
	case MSR_IA32_SPEC_CTRL:
		if (!msr_info->host_initiated &&
4221 4222
		    !guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) &&
		    !guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD))
4223 4224 4225 4226
			return 1;

		msr_info->data = svm->spec_ctrl;
		break;
4227 4228 4229 4230 4231 4232 4233
	case MSR_AMD64_VIRT_SPEC_CTRL:
		if (!msr_info->host_initiated &&
		    !guest_cpuid_has(vcpu, X86_FEATURE_VIRT_SSBD))
			return 1;

		msr_info->data = svm->virt_spec_ctrl;
		break;
4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250
	case MSR_F15H_IC_CFG: {

		int family, model;

		family = guest_cpuid_family(vcpu);
		model  = guest_cpuid_model(vcpu);

		if (family < 0 || model < 0)
			return kvm_get_msr_common(vcpu, msr_info);

		msr_info->data = 0;

		if (family == 0x15 &&
		    (model >= 0x2 && model < 0x20))
			msr_info->data = 0x1E;
		}
		break;
4251 4252 4253
	case MSR_F10H_DECFG:
		msr_info->data = svm->msr_decfg;
		break;
A
Avi Kivity 已提交
4254
	default:
4255
		return kvm_get_msr_common(vcpu, msr_info);
A
Avi Kivity 已提交
4256 4257 4258 4259
	}
	return 0;
}

A
Avi Kivity 已提交
4260
static int rdmsr_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
4261
{
4262
	return kvm_emulate_rdmsr(&svm->vcpu);
A
Avi Kivity 已提交
4263 4264
}

4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289
static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	int svm_dis, chg_mask;

	if (data & ~SVM_VM_CR_VALID_MASK)
		return 1;

	chg_mask = SVM_VM_CR_VALID_MASK;

	if (svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK)
		chg_mask &= ~(SVM_VM_CR_SVM_LOCK_MASK | SVM_VM_CR_SVM_DIS_MASK);

	svm->nested.vm_cr_msr &= ~chg_mask;
	svm->nested.vm_cr_msr |= (data & chg_mask);

	svm_dis = svm->nested.vm_cr_msr & SVM_VM_CR_SVM_DIS_MASK;

	/* check for svm_disable while efer.svme is set */
	if (svm_dis && (vcpu->arch.efer & EFER_SVME))
		return 1;

	return 0;
}

4290
static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
A
Avi Kivity 已提交
4291
{
4292 4293
	struct vcpu_svm *svm = to_svm(vcpu);

4294 4295
	u32 ecx = msr->index;
	u64 data = msr->data;
A
Avi Kivity 已提交
4296
	switch (ecx) {
P
Paolo Bonzini 已提交
4297 4298 4299 4300 4301 4302 4303
	case MSR_IA32_CR_PAT:
		if (!kvm_mtrr_valid(vcpu, MSR_IA32_CR_PAT, data))
			return 1;
		vcpu->arch.pat = data;
		svm->vmcb->save.g_pat = data;
		mark_dirty(svm->vmcb, VMCB_NPT);
		break;
4304 4305
	case MSR_IA32_SPEC_CTRL:
		if (!msr->host_initiated &&
4306 4307
		    !guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS) &&
		    !guest_cpuid_has(vcpu, X86_FEATURE_AMD_SSBD))
4308 4309
			return 1;

4310
		if (data & ~kvm_spec_ctrl_valid_bits(vcpu))
4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329
			return 1;

		svm->spec_ctrl = data;
		if (!data)
			break;

		/*
		 * For non-nested:
		 * When it's written (to non-zero) for the first time, pass
		 * it through.
		 *
		 * For nested:
		 * The handling of the MSR bitmap for L2 guests is done in
		 * nested_svm_vmrun_msrpm.
		 * We update the L1 MSR bit as well since it will end up
		 * touching the MSR anyway now.
		 */
		set_msr_interception(svm->msrpm, MSR_IA32_SPEC_CTRL, 1, 1);
		break;
A
Ashok Raj 已提交
4330 4331
	case MSR_IA32_PRED_CMD:
		if (!msr->host_initiated &&
4332
		    !guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB))
A
Ashok Raj 已提交
4333 4334 4335 4336
			return 1;

		if (data & ~PRED_CMD_IBPB)
			return 1;
4337 4338
		if (!boot_cpu_has(X86_FEATURE_AMD_IBPB))
			return 1;
A
Ashok Raj 已提交
4339 4340 4341 4342 4343 4344
		if (!data)
			break;

		wrmsrl(MSR_IA32_PRED_CMD, PRED_CMD_IBPB);
		set_msr_interception(svm->msrpm, MSR_IA32_PRED_CMD, 0, 1);
		break;
4345 4346 4347 4348 4349 4350 4351 4352 4353 4354
	case MSR_AMD64_VIRT_SPEC_CTRL:
		if (!msr->host_initiated &&
		    !guest_cpuid_has(vcpu, X86_FEATURE_VIRT_SSBD))
			return 1;

		if (data & ~SPEC_CTRL_SSBD)
			return 1;

		svm->virt_spec_ctrl = data;
		break;
B
Brian Gerst 已提交
4355
	case MSR_STAR:
4356
		svm->vmcb->save.star = data;
A
Avi Kivity 已提交
4357
		break;
4358
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
4359
	case MSR_LSTAR:
4360
		svm->vmcb->save.lstar = data;
A
Avi Kivity 已提交
4361 4362
		break;
	case MSR_CSTAR:
4363
		svm->vmcb->save.cstar = data;
A
Avi Kivity 已提交
4364 4365
		break;
	case MSR_KERNEL_GS_BASE:
4366
		svm->vmcb->save.kernel_gs_base = data;
A
Avi Kivity 已提交
4367 4368
		break;
	case MSR_SYSCALL_MASK:
4369
		svm->vmcb->save.sfmask = data;
A
Avi Kivity 已提交
4370 4371 4372
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
4373
		svm->vmcb->save.sysenter_cs = data;
A
Avi Kivity 已提交
4374 4375
		break;
	case MSR_IA32_SYSENTER_EIP:
4376
		svm->sysenter_eip = data;
4377
		svm->vmcb->save.sysenter_eip = data;
A
Avi Kivity 已提交
4378 4379
		break;
	case MSR_IA32_SYSENTER_ESP:
4380
		svm->sysenter_esp = data;
4381
		svm->vmcb->save.sysenter_esp = data;
A
Avi Kivity 已提交
4382
		break;
P
Paolo Bonzini 已提交
4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394
	case MSR_TSC_AUX:
		if (!boot_cpu_has(X86_FEATURE_RDTSCP))
			return 1;

		/*
		 * This is rare, so we update the MSR here instead of using
		 * direct_access_msrs.  Doing that would require a rdmsr in
		 * svm_vcpu_put.
		 */
		svm->tsc_aux = data;
		wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
		break;
4395
	case MSR_IA32_DEBUGCTLMSR:
4396
		if (!boot_cpu_has(X86_FEATURE_LBRV)) {
4397 4398
			vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
				    __func__, data);
4399 4400 4401 4402 4403 4404
			break;
		}
		if (data & DEBUGCTL_RESERVED_BITS)
			return 1;

		svm->vmcb->save.dbgctl = data;
4405
		mark_dirty(svm->vmcb, VMCB_LBR);
4406 4407 4408 4409
		if (data & (1ULL<<0))
			svm_enable_lbrv(svm);
		else
			svm_disable_lbrv(svm);
4410
		break;
A
Alexander Graf 已提交
4411
	case MSR_VM_HSAVE_PA:
4412
		svm->nested.hsave_msr = data;
4413
		break;
4414
	case MSR_VM_CR:
4415
		return svm_set_vm_cr(vcpu, data);
4416
	case MSR_VM_IGNNE:
4417
		vcpu_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
4418
		break;
4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436
	case MSR_F10H_DECFG: {
		struct kvm_msr_entry msr_entry;

		msr_entry.index = msr->index;
		if (svm_get_msr_feature(&msr_entry))
			return 1;

		/* Check the supported bits */
		if (data & ~msr_entry.data)
			return 1;

		/* Don't allow the guest to change a bit, #GP */
		if (!msr->host_initiated && (data ^ msr_entry.data))
			return 1;

		svm->msr_decfg = data;
		break;
	}
4437 4438 4439
	case MSR_IA32_APICBASE:
		if (kvm_vcpu_apicv_active(vcpu))
			avic_update_vapic_bar(to_svm(vcpu), data);
4440
		/* Fall through */
A
Avi Kivity 已提交
4441
	default:
4442
		return kvm_set_msr_common(vcpu, msr);
A
Avi Kivity 已提交
4443 4444 4445 4446
	}
	return 0;
}

A
Avi Kivity 已提交
4447
static int wrmsr_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
4448
{
4449
	return kvm_emulate_wrmsr(&svm->vcpu);
A
Avi Kivity 已提交
4450 4451
}

A
Avi Kivity 已提交
4452
static int msr_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
4453
{
R
Rusty Russell 已提交
4454
	if (svm->vmcb->control.exit_info_1)
A
Avi Kivity 已提交
4455
		return wrmsr_interception(svm);
A
Avi Kivity 已提交
4456
	else
A
Avi Kivity 已提交
4457
		return rdmsr_interception(svm);
A
Avi Kivity 已提交
4458 4459
}

A
Avi Kivity 已提交
4460
static int interrupt_window_interception(struct vcpu_svm *svm)
4461
{
4462
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
4463
	svm_clear_vintr(svm);
4464
	svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
4465
	mark_dirty(svm->vmcb, VMCB_INTR);
4466
	++svm->vcpu.stat.irq_window_exits;
4467 4468 4469
	return 1;
}

4470 4471
static int pause_interception(struct vcpu_svm *svm)
{
4472 4473 4474
	struct kvm_vcpu *vcpu = &svm->vcpu;
	bool in_kernel = (svm_get_cpl(vcpu) == 0);

4475 4476 4477
	if (pause_filter_thresh)
		grow_ple_window(vcpu);

4478
	kvm_vcpu_on_spin(vcpu, in_kernel);
4479 4480 4481
	return 1;
}

4482 4483
static int nop_interception(struct vcpu_svm *svm)
{
4484
	return kvm_skip_emulated_instruction(&(svm->vcpu));
4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498
}

static int monitor_interception(struct vcpu_svm *svm)
{
	printk_once(KERN_WARNING "kvm: MONITOR instruction emulated as NOP!\n");
	return nop_interception(svm);
}

static int mwait_interception(struct vcpu_svm *svm)
{
	printk_once(KERN_WARNING "kvm: MWAIT instruction emulated as NOP!\n");
	return nop_interception(svm);
}

4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510
enum avic_ipi_failure_cause {
	AVIC_IPI_FAILURE_INVALID_INT_TYPE,
	AVIC_IPI_FAILURE_TARGET_NOT_RUNNING,
	AVIC_IPI_FAILURE_INVALID_TARGET,
	AVIC_IPI_FAILURE_INVALID_BACKING_PAGE,
};

static int avic_incomplete_ipi_interception(struct vcpu_svm *svm)
{
	u32 icrh = svm->vmcb->control.exit_info_1 >> 32;
	u32 icrl = svm->vmcb->control.exit_info_1;
	u32 id = svm->vmcb->control.exit_info_2 >> 32;
D
Dan Carpenter 已提交
4511
	u32 index = svm->vmcb->control.exit_info_2 & 0xFF;
4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532
	struct kvm_lapic *apic = svm->vcpu.arch.apic;

	trace_kvm_avic_incomplete_ipi(svm->vcpu.vcpu_id, icrh, icrl, id, index);

	switch (id) {
	case AVIC_IPI_FAILURE_INVALID_INT_TYPE:
		/*
		 * AVIC hardware handles the generation of
		 * IPIs when the specified Message Type is Fixed
		 * (also known as fixed delivery mode) and
		 * the Trigger Mode is edge-triggered. The hardware
		 * also supports self and broadcast delivery modes
		 * specified via the Destination Shorthand(DSH)
		 * field of the ICRL. Logical and physical APIC ID
		 * formats are supported. All other IPI types cause
		 * a #VMEXIT, which needs to emulated.
		 */
		kvm_lapic_reg_write(apic, APIC_ICR2, icrh);
		kvm_lapic_reg_write(apic, APIC_ICR, icrl);
		break;
	case AVIC_IPI_FAILURE_TARGET_NOT_RUNNING: {
4533 4534 4535
		int i;
		struct kvm_vcpu *vcpu;
		struct kvm *kvm = svm->vcpu.kvm;
4536 4537 4538
		struct kvm_lapic *apic = svm->vcpu.arch.apic;

		/*
4539 4540 4541
		 * At this point, we expect that the AVIC HW has already
		 * set the appropriate IRR bits on the valid target
		 * vcpus. So, we just need to kick the appropriate vcpu.
4542
		 */
4543 4544
		kvm_for_each_vcpu(i, vcpu, kvm) {
			bool m = kvm_apic_match_dest(vcpu, apic,
4545
						     icrl & APIC_SHORT_MASK,
4546
						     GET_APIC_DEST_FIELD(icrh),
4547
						     icrl & APIC_DEST_MASK);
4548 4549 4550 4551

			if (m && !avic_vcpu_is_running(vcpu))
				kvm_vcpu_wake_up(vcpu);
		}
4552 4553 4554
		break;
	}
	case AVIC_IPI_FAILURE_INVALID_TARGET:
4555 4556
		WARN_ONCE(1, "Invalid IPI target: index=%u, vcpu=%d, icr=%#0x:%#0x\n",
			  index, svm->vcpu.vcpu_id, icrh, icrl);
4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569
		break;
	case AVIC_IPI_FAILURE_INVALID_BACKING_PAGE:
		WARN_ONCE(1, "Invalid backing page\n");
		break;
	default:
		pr_err("Unknown IPI interception\n");
	}

	return 1;
}

static u32 *avic_get_logical_id_entry(struct kvm_vcpu *vcpu, u32 ldr, bool flat)
{
4570
	struct kvm_svm *kvm_svm = to_kvm_svm(vcpu->kvm);
4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591
	int index;
	u32 *logical_apic_id_table;
	int dlid = GET_APIC_LOGICAL_ID(ldr);

	if (!dlid)
		return NULL;

	if (flat) { /* flat */
		index = ffs(dlid) - 1;
		if (index > 7)
			return NULL;
	} else { /* cluster */
		int cluster = (dlid & 0xf0) >> 4;
		int apic = ffs(dlid & 0x0f) - 1;

		if ((apic < 0) || (apic > 7) ||
		    (cluster >= 0xf))
			return NULL;
		index = (cluster << 2) + apic;
	}

4592
	logical_apic_id_table = (u32 *) page_address(kvm_svm->avic_logical_id_table_page);
4593 4594 4595 4596

	return &logical_apic_id_table[index];
}

4597
static int avic_ldr_write(struct kvm_vcpu *vcpu, u8 g_physical_id, u32 ldr)
4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609
{
	bool flat;
	u32 *entry, new_entry;

	flat = kvm_lapic_get_reg(vcpu->arch.apic, APIC_DFR) == APIC_DFR_FLAT;
	entry = avic_get_logical_id_entry(vcpu, ldr, flat);
	if (!entry)
		return -EINVAL;

	new_entry = READ_ONCE(*entry);
	new_entry &= ~AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK;
	new_entry |= (g_physical_id & AVIC_LOGICAL_ID_ENTRY_GUEST_PHYSICAL_ID_MASK);
4610
	new_entry |= AVIC_LOGICAL_ID_ENTRY_VALID_MASK;
4611 4612 4613 4614 4615
	WRITE_ONCE(*entry, new_entry);

	return 0;
}

4616 4617 4618 4619 4620 4621 4622
static void avic_invalidate_logical_id_entry(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	bool flat = svm->dfr_reg == APIC_DFR_FLAT;
	u32 *entry = avic_get_logical_id_entry(vcpu, svm->ldr_reg, flat);

	if (entry)
4623
		clear_bit(AVIC_LOGICAL_ID_ENTRY_VALID_BIT, (unsigned long *)entry);
4624 4625
}

4626 4627
static int avic_handle_ldr_update(struct kvm_vcpu *vcpu)
{
4628
	int ret = 0;
4629 4630
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 ldr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_LDR);
4631
	u32 id = kvm_xapic_id(vcpu->arch.apic);
4632

4633 4634
	if (ldr == svm->ldr_reg)
		return 0;
4635

4636 4637 4638
	avic_invalidate_logical_id_entry(vcpu);

	if (ldr)
4639
		ret = avic_ldr_write(vcpu, id, ldr);
4640 4641

	if (!ret)
4642
		svm->ldr_reg = ldr;
4643

4644 4645 4646 4647 4648 4649 4650
	return ret;
}

static int avic_handle_apic_id_update(struct kvm_vcpu *vcpu)
{
	u64 *old, *new;
	struct vcpu_svm *svm = to_svm(vcpu);
4651
	u32 id = kvm_xapic_id(vcpu->arch.apic);
4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675

	if (vcpu->vcpu_id == id)
		return 0;

	old = avic_get_physical_id_entry(vcpu, vcpu->vcpu_id);
	new = avic_get_physical_id_entry(vcpu, id);
	if (!new || !old)
		return 1;

	/* We need to move physical_id_entry to new offset */
	*new = *old;
	*old = 0ULL;
	to_svm(vcpu)->avic_physical_id_cache = new;

	/*
	 * Also update the guest physical APIC ID in the logical
	 * APIC ID table entry if already setup the LDR.
	 */
	if (svm->ldr_reg)
		avic_handle_ldr_update(vcpu);

	return 0;
}

4676
static void avic_handle_dfr_update(struct kvm_vcpu *vcpu)
4677 4678 4679 4680
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 dfr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_DFR);

4681 4682
	if (svm->dfr_reg == dfr)
		return;
4683

4684 4685
	avic_invalidate_logical_id_entry(vcpu);
	svm->dfr_reg = dfr;
4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762
}

static int avic_unaccel_trap_write(struct vcpu_svm *svm)
{
	struct kvm_lapic *apic = svm->vcpu.arch.apic;
	u32 offset = svm->vmcb->control.exit_info_1 &
				AVIC_UNACCEL_ACCESS_OFFSET_MASK;

	switch (offset) {
	case APIC_ID:
		if (avic_handle_apic_id_update(&svm->vcpu))
			return 0;
		break;
	case APIC_LDR:
		if (avic_handle_ldr_update(&svm->vcpu))
			return 0;
		break;
	case APIC_DFR:
		avic_handle_dfr_update(&svm->vcpu);
		break;
	default:
		break;
	}

	kvm_lapic_reg_write(apic, offset, kvm_lapic_get_reg(apic, offset));

	return 1;
}

static bool is_avic_unaccelerated_access_trap(u32 offset)
{
	bool ret = false;

	switch (offset) {
	case APIC_ID:
	case APIC_EOI:
	case APIC_RRR:
	case APIC_LDR:
	case APIC_DFR:
	case APIC_SPIV:
	case APIC_ESR:
	case APIC_ICR:
	case APIC_LVTT:
	case APIC_LVTTHMR:
	case APIC_LVTPC:
	case APIC_LVT0:
	case APIC_LVT1:
	case APIC_LVTERR:
	case APIC_TMICT:
	case APIC_TDCR:
		ret = true;
		break;
	default:
		break;
	}
	return ret;
}

static int avic_unaccelerated_access_interception(struct vcpu_svm *svm)
{
	int ret = 0;
	u32 offset = svm->vmcb->control.exit_info_1 &
		     AVIC_UNACCEL_ACCESS_OFFSET_MASK;
	u32 vector = svm->vmcb->control.exit_info_2 &
		     AVIC_UNACCEL_ACCESS_VECTOR_MASK;
	bool write = (svm->vmcb->control.exit_info_1 >> 32) &
		     AVIC_UNACCEL_ACCESS_WRITE_MASK;
	bool trap = is_avic_unaccelerated_access_trap(offset);

	trace_kvm_avic_unaccelerated_access(svm->vcpu.vcpu_id, offset,
					    trap, write, vector);
	if (trap) {
		/* Handling Trap */
		WARN_ONCE(!write, "svm: Handling trap read.\n");
		ret = avic_unaccel_trap_write(svm);
	} else {
		/* Handling Fault */
4763
		ret = kvm_emulate_instruction(&svm->vcpu, 0);
4764 4765 4766 4767 4768
	}

	return ret;
}

4769
static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
4770 4771 4772 4773
	[SVM_EXIT_READ_CR0]			= cr_interception,
	[SVM_EXIT_READ_CR3]			= cr_interception,
	[SVM_EXIT_READ_CR4]			= cr_interception,
	[SVM_EXIT_READ_CR8]			= cr_interception,
4774
	[SVM_EXIT_CR0_SEL_WRITE]		= cr_interception,
4775
	[SVM_EXIT_WRITE_CR0]			= cr_interception,
4776 4777
	[SVM_EXIT_WRITE_CR3]			= cr_interception,
	[SVM_EXIT_WRITE_CR4]			= cr_interception,
J
Joerg Roedel 已提交
4778
	[SVM_EXIT_WRITE_CR8]			= cr8_write_interception,
4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794
	[SVM_EXIT_READ_DR0]			= dr_interception,
	[SVM_EXIT_READ_DR1]			= dr_interception,
	[SVM_EXIT_READ_DR2]			= dr_interception,
	[SVM_EXIT_READ_DR3]			= dr_interception,
	[SVM_EXIT_READ_DR4]			= dr_interception,
	[SVM_EXIT_READ_DR5]			= dr_interception,
	[SVM_EXIT_READ_DR6]			= dr_interception,
	[SVM_EXIT_READ_DR7]			= dr_interception,
	[SVM_EXIT_WRITE_DR0]			= dr_interception,
	[SVM_EXIT_WRITE_DR1]			= dr_interception,
	[SVM_EXIT_WRITE_DR2]			= dr_interception,
	[SVM_EXIT_WRITE_DR3]			= dr_interception,
	[SVM_EXIT_WRITE_DR4]			= dr_interception,
	[SVM_EXIT_WRITE_DR5]			= dr_interception,
	[SVM_EXIT_WRITE_DR6]			= dr_interception,
	[SVM_EXIT_WRITE_DR7]			= dr_interception,
J
Jan Kiszka 已提交
4795 4796
	[SVM_EXIT_EXCP_BASE + DB_VECTOR]	= db_interception,
	[SVM_EXIT_EXCP_BASE + BP_VECTOR]	= bp_interception,
4797
	[SVM_EXIT_EXCP_BASE + UD_VECTOR]	= ud_interception,
J
Joerg Roedel 已提交
4798 4799
	[SVM_EXIT_EXCP_BASE + PF_VECTOR]	= pf_interception,
	[SVM_EXIT_EXCP_BASE + MC_VECTOR]	= mc_interception,
4800
	[SVM_EXIT_EXCP_BASE + AC_VECTOR]	= ac_interception,
4801
	[SVM_EXIT_EXCP_BASE + GP_VECTOR]	= gp_interception,
J
Joerg Roedel 已提交
4802
	[SVM_EXIT_INTR]				= intr_interception,
4803
	[SVM_EXIT_NMI]				= nmi_interception,
A
Avi Kivity 已提交
4804 4805
	[SVM_EXIT_SMI]				= nop_on_interception,
	[SVM_EXIT_INIT]				= nop_on_interception,
4806
	[SVM_EXIT_VINTR]			= interrupt_window_interception,
A
Avi Kivity 已提交
4807
	[SVM_EXIT_RDPMC]			= rdpmc_interception,
A
Avi Kivity 已提交
4808
	[SVM_EXIT_CPUID]			= cpuid_interception,
4809
	[SVM_EXIT_IRET]                         = iret_interception,
4810
	[SVM_EXIT_INVD]                         = emulate_on_interception,
4811
	[SVM_EXIT_PAUSE]			= pause_interception,
A
Avi Kivity 已提交
4812
	[SVM_EXIT_HLT]				= halt_interception,
M
Marcelo Tosatti 已提交
4813
	[SVM_EXIT_INVLPG]			= invlpg_interception,
A
Alexander Graf 已提交
4814
	[SVM_EXIT_INVLPGA]			= invlpga_interception,
J
Joerg Roedel 已提交
4815
	[SVM_EXIT_IOIO]				= io_interception,
A
Avi Kivity 已提交
4816 4817
	[SVM_EXIT_MSR]				= msr_interception,
	[SVM_EXIT_TASK_SWITCH]			= task_switch_interception,
4818
	[SVM_EXIT_SHUTDOWN]			= shutdown_interception,
A
Alexander Graf 已提交
4819
	[SVM_EXIT_VMRUN]			= vmrun_interception,
4820
	[SVM_EXIT_VMMCALL]			= vmmcall_interception,
4821 4822
	[SVM_EXIT_VMLOAD]			= vmload_interception,
	[SVM_EXIT_VMSAVE]			= vmsave_interception,
4823 4824
	[SVM_EXIT_STGI]				= stgi_interception,
	[SVM_EXIT_CLGI]				= clgi_interception,
4825
	[SVM_EXIT_SKINIT]			= skinit_interception,
D
David Kaplan 已提交
4826
	[SVM_EXIT_WBINVD]                       = wbinvd_interception,
4827 4828
	[SVM_EXIT_MONITOR]			= monitor_interception,
	[SVM_EXIT_MWAIT]			= mwait_interception,
J
Joerg Roedel 已提交
4829
	[SVM_EXIT_XSETBV]			= xsetbv_interception,
J
Jim Mattson 已提交
4830
	[SVM_EXIT_RDPRU]			= rdpru_interception,
4831
	[SVM_EXIT_NPF]				= npf_interception,
B
Brijesh Singh 已提交
4832
	[SVM_EXIT_RSM]                          = rsm_interception,
4833 4834
	[SVM_EXIT_AVIC_INCOMPLETE_IPI]		= avic_incomplete_ipi_interception,
	[SVM_EXIT_AVIC_UNACCELERATED_ACCESS]	= avic_unaccelerated_access_interception,
A
Avi Kivity 已提交
4835 4836
};

4837
static void dump_vmcb(struct kvm_vcpu *vcpu)
4838 4839 4840 4841 4842
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;
	struct vmcb_save_area *save = &svm->vmcb->save;

4843 4844 4845 4846 4847
	if (!dump_invalid_vmcb) {
		pr_warn_ratelimited("set kvm_amd.dump_invalid_vmcb=1 to dump internal KVM state.\n");
		return;
	}

4848
	pr_err("VMCB Control Area:\n");
4849 4850 4851 4852 4853 4854 4855
	pr_err("%-20s%04x\n", "cr_read:", control->intercept_cr & 0xffff);
	pr_err("%-20s%04x\n", "cr_write:", control->intercept_cr >> 16);
	pr_err("%-20s%04x\n", "dr_read:", control->intercept_dr & 0xffff);
	pr_err("%-20s%04x\n", "dr_write:", control->intercept_dr >> 16);
	pr_err("%-20s%08x\n", "exceptions:", control->intercept_exceptions);
	pr_err("%-20s%016llx\n", "intercepts:", control->intercept);
	pr_err("%-20s%d\n", "pause filter count:", control->pause_filter_count);
4856 4857
	pr_err("%-20s%d\n", "pause filter threshold:",
	       control->pause_filter_thresh);
4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872
	pr_err("%-20s%016llx\n", "iopm_base_pa:", control->iopm_base_pa);
	pr_err("%-20s%016llx\n", "msrpm_base_pa:", control->msrpm_base_pa);
	pr_err("%-20s%016llx\n", "tsc_offset:", control->tsc_offset);
	pr_err("%-20s%d\n", "asid:", control->asid);
	pr_err("%-20s%d\n", "tlb_ctl:", control->tlb_ctl);
	pr_err("%-20s%08x\n", "int_ctl:", control->int_ctl);
	pr_err("%-20s%08x\n", "int_vector:", control->int_vector);
	pr_err("%-20s%08x\n", "int_state:", control->int_state);
	pr_err("%-20s%08x\n", "exit_code:", control->exit_code);
	pr_err("%-20s%016llx\n", "exit_info1:", control->exit_info_1);
	pr_err("%-20s%016llx\n", "exit_info2:", control->exit_info_2);
	pr_err("%-20s%08x\n", "exit_int_info:", control->exit_int_info);
	pr_err("%-20s%08x\n", "exit_int_info_err:", control->exit_int_info_err);
	pr_err("%-20s%lld\n", "nested_ctl:", control->nested_ctl);
	pr_err("%-20s%016llx\n", "nested_cr3:", control->nested_cr3);
4873
	pr_err("%-20s%016llx\n", "avic_vapic_bar:", control->avic_vapic_bar);
4874 4875
	pr_err("%-20s%08x\n", "event_inj:", control->event_inj);
	pr_err("%-20s%08x\n", "event_inj_err:", control->event_inj_err);
4876
	pr_err("%-20s%lld\n", "virt_ext:", control->virt_ext);
4877
	pr_err("%-20s%016llx\n", "next_rip:", control->next_rip);
4878 4879 4880
	pr_err("%-20s%016llx\n", "avic_backing_page:", control->avic_backing_page);
	pr_err("%-20s%016llx\n", "avic_logical_id:", control->avic_logical_id);
	pr_err("%-20s%016llx\n", "avic_physical_id:", control->avic_physical_id);
4881
	pr_err("VMCB State Save Area:\n");
4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "es:",
	       save->es.selector, save->es.attrib,
	       save->es.limit, save->es.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "cs:",
	       save->cs.selector, save->cs.attrib,
	       save->cs.limit, save->cs.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "ss:",
	       save->ss.selector, save->ss.attrib,
	       save->ss.limit, save->ss.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "ds:",
	       save->ds.selector, save->ds.attrib,
	       save->ds.limit, save->ds.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "fs:",
	       save->fs.selector, save->fs.attrib,
	       save->fs.limit, save->fs.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "gs:",
	       save->gs.selector, save->gs.attrib,
	       save->gs.limit, save->gs.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "gdtr:",
	       save->gdtr.selector, save->gdtr.attrib,
	       save->gdtr.limit, save->gdtr.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "ldtr:",
	       save->ldtr.selector, save->ldtr.attrib,
	       save->ldtr.limit, save->ldtr.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "idtr:",
	       save->idtr.selector, save->idtr.attrib,
	       save->idtr.limit, save->idtr.base);
	pr_err("%-5s s: %04x a: %04x l: %08x b: %016llx\n",
	       "tr:",
	       save->tr.selector, save->tr.attrib,
	       save->tr.limit, save->tr.base);
4922 4923
	pr_err("cpl:            %d                efer:         %016llx\n",
		save->cpl, save->efer);
4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "cr0:", save->cr0, "cr2:", save->cr2);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "cr3:", save->cr3, "cr4:", save->cr4);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "dr6:", save->dr6, "dr7:", save->dr7);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "rip:", save->rip, "rflags:", save->rflags);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "rsp:", save->rsp, "rax:", save->rax);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "star:", save->star, "lstar:", save->lstar);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "cstar:", save->cstar, "sfmask:", save->sfmask);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "kernel_gs_base:", save->kernel_gs_base,
	       "sysenter_cs:", save->sysenter_cs);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "sysenter_esp:", save->sysenter_esp,
	       "sysenter_eip:", save->sysenter_eip);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "gpat:", save->g_pat, "dbgctl:", save->dbgctl);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "br_from:", save->br_from, "br_to:", save->br_to);
	pr_err("%-15s %016llx %-13s %016llx\n",
	       "excp_from:", save->last_excp_from,
	       "excp_to:", save->last_excp_to);
4951 4952
}

4953 4954 4955 4956 4957 4958 4959 4960
static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
{
	struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;

	*info1 = control->exit_info_1;
	*info2 = control->exit_info_2;
}

4961 4962
static int handle_exit(struct kvm_vcpu *vcpu,
	enum exit_fastpath_completion exit_fastpath)
A
Avi Kivity 已提交
4963
{
4964
	struct vcpu_svm *svm = to_svm(vcpu);
A
Avi Kivity 已提交
4965
	struct kvm_run *kvm_run = vcpu->run;
4966
	u32 exit_code = svm->vmcb->control.exit_code;
A
Avi Kivity 已提交
4967

4968 4969
	trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);

4970
	if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE))
4971 4972 4973
		vcpu->arch.cr0 = svm->vmcb->save.cr0;
	if (npt_enabled)
		vcpu->arch.cr3 = svm->vmcb->save.cr3;
4974

4975 4976 4977 4978 4979 4980 4981
	if (unlikely(svm->nested.exit_required)) {
		nested_svm_vmexit(svm);
		svm->nested.exit_required = false;

		return 1;
	}

4982
	if (is_guest_mode(vcpu)) {
4983 4984
		int vmexit;

4985 4986 4987 4988
		trace_kvm_nested_vmexit(svm->vmcb->save.rip, exit_code,
					svm->vmcb->control.exit_info_1,
					svm->vmcb->control.exit_info_2,
					svm->vmcb->control.exit_int_info,
4989 4990
					svm->vmcb->control.exit_int_info_err,
					KVM_ISA_SVM);
4991

4992 4993 4994 4995 4996 4997
		vmexit = nested_svm_exit_special(svm);

		if (vmexit == NESTED_EXIT_CONTINUE)
			vmexit = nested_svm_exit_handled(svm);

		if (vmexit == NESTED_EXIT_DONE)
4998 4999 5000
			return 1;
	}

5001 5002
	svm_complete_interrupts(svm);

5003 5004 5005 5006
	if (svm->vmcb->control.exit_code == SVM_EXIT_ERR) {
		kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
		kvm_run->fail_entry.hardware_entry_failure_reason
			= svm->vmcb->control.exit_code;
5007
		dump_vmcb(vcpu);
5008 5009 5010
		return 0;
	}

5011
	if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
5012
	    exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
5013 5014
	    exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
	    exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
5015
		printk(KERN_ERR "%s: unexpected exit_int_info 0x%x "
A
Avi Kivity 已提交
5016
		       "exit_code 0x%x\n",
5017
		       __func__, svm->vmcb->control.exit_int_info,
A
Avi Kivity 已提交
5018 5019
		       exit_code);

5020 5021 5022 5023
	if (exit_fastpath == EXIT_FASTPATH_SKIP_EMUL_INS) {
		kvm_skip_emulated_instruction(vcpu);
		return 1;
	} else if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
J
Joe Perches 已提交
5024
	    || !svm_exit_handlers[exit_code]) {
5025 5026 5027 5028 5029 5030 5031 5032
		vcpu_unimpl(vcpu, "svm: unexpected exit reason 0x%x\n", exit_code);
		dump_vmcb(vcpu);
		vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
		vcpu->run->internal.suberror =
			KVM_INTERNAL_ERROR_UNEXPECTED_EXIT_REASON;
		vcpu->run->internal.ndata = 1;
		vcpu->run->internal.data[0] = exit_code;
		return 0;
A
Avi Kivity 已提交
5033 5034
	}

5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046
#ifdef CONFIG_RETPOLINE
	if (exit_code == SVM_EXIT_MSR)
		return msr_interception(svm);
	else if (exit_code == SVM_EXIT_VINTR)
		return interrupt_window_interception(svm);
	else if (exit_code == SVM_EXIT_INTR)
		return intr_interception(svm);
	else if (exit_code == SVM_EXIT_HLT)
		return halt_interception(svm);
	else if (exit_code == SVM_EXIT_NPF)
		return npf_interception(svm);
#endif
A
Avi Kivity 已提交
5047
	return svm_exit_handlers[exit_code](svm);
A
Avi Kivity 已提交
5048 5049 5050 5051 5052 5053
}

static void reload_tss(struct kvm_vcpu *vcpu)
{
	int cpu = raw_smp_processor_id();

5054 5055
	struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
	sd->tss_desc->type = 9; /* available 32/64-bit TSS */
A
Avi Kivity 已提交
5056 5057 5058
	load_TR_desc();
}

5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082
static void pre_sev_run(struct vcpu_svm *svm, int cpu)
{
	struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
	int asid = sev_get_asid(svm->vcpu.kvm);

	/* Assign the asid allocated with this SEV guest */
	svm->vmcb->control.asid = asid;

	/*
	 * Flush guest TLB:
	 *
	 * 1) when different VMCB for the same ASID is to be run on the same host CPU.
	 * 2) or this VMCB was executed on different host CPU in previous VMRUNs.
	 */
	if (sd->sev_vmcbs[asid] == svm->vmcb &&
	    svm->last_cpu == cpu)
		return;

	svm->last_cpu = cpu;
	sd->sev_vmcbs[asid] = svm->vmcb;
	svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
	mark_dirty(svm->vmcb, VMCB_ASID);
}

R
Rusty Russell 已提交
5083
static void pre_svm_run(struct vcpu_svm *svm)
A
Avi Kivity 已提交
5084 5085 5086
{
	int cpu = raw_smp_processor_id();

5087
	struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
A
Avi Kivity 已提交
5088

5089 5090 5091
	if (sev_guest(svm->vcpu.kvm))
		return pre_sev_run(svm, cpu);

5092
	/* FIXME: handle wraparound of asid_generation */
5093 5094
	if (svm->asid_generation != sd->asid_generation)
		new_asid(svm, sd);
A
Avi Kivity 已提交
5095 5096
}

5097 5098 5099 5100 5101 5102
static void svm_inject_nmi(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	svm->vmcb->control.event_inj = SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_NMI;
	vcpu->arch.hflags |= HF_NMI_MASK;
5103
	set_intercept(svm, INTERCEPT_IRET);
5104 5105
	++vcpu->stat.nmi_injections;
}
A
Avi Kivity 已提交
5106

5107
static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
A
Avi Kivity 已提交
5108 5109 5110
{
	struct vmcb_control_area *control;

5111
	/* The following fields are ignored when AVIC is enabled */
R
Rusty Russell 已提交
5112
	control = &svm->vmcb->control;
5113
	control->int_vector = irq;
A
Avi Kivity 已提交
5114 5115 5116
	control->int_ctl &= ~V_INTR_PRIO_MASK;
	control->int_ctl |= V_IRQ_MASK |
		((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
5117
	mark_dirty(svm->vmcb, VMCB_INTR);
A
Avi Kivity 已提交
5118 5119
}

5120
static void svm_set_irq(struct kvm_vcpu *vcpu)
E
Eddie Dong 已提交
5121 5122 5123
{
	struct vcpu_svm *svm = to_svm(vcpu);

5124
	BUG_ON(!(gif_set(svm)));
5125

5126 5127 5128
	trace_kvm_inj_virq(vcpu->arch.interrupt.nr);
	++vcpu->stat.irq_injections;

5129 5130
	svm->vmcb->control.event_inj = vcpu->arch.interrupt.nr |
		SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
E
Eddie Dong 已提交
5131 5132
}

5133 5134 5135 5136 5137
static inline bool svm_nested_virtualize_tpr(struct kvm_vcpu *vcpu)
{
	return is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK);
}

5138
static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
5139 5140 5141
{
	struct vcpu_svm *svm = to_svm(vcpu);

5142
	if (svm_nested_virtualize_tpr(vcpu))
5143 5144
		return;

5145 5146
	clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);

5147
	if (irr == -1)
5148 5149
		return;

5150
	if (tpr >= irr)
5151
		set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
5152
}
5153

5154
static void svm_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
5155 5156 5157 5158
{
	return;
}

5159 5160
static void svm_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr)
{
5161 5162
}

5163
static void svm_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr)
5164
{
5165 5166
}

5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198
static int svm_set_pi_irte_mode(struct kvm_vcpu *vcpu, bool activate)
{
	int ret = 0;
	unsigned long flags;
	struct amd_svm_iommu_ir *ir;
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!kvm_arch_has_assigned_device(vcpu->kvm))
		return 0;

	/*
	 * Here, we go through the per-vcpu ir_list to update all existing
	 * interrupt remapping table entry targeting this vcpu.
	 */
	spin_lock_irqsave(&svm->ir_list_lock, flags);

	if (list_empty(&svm->ir_list))
		goto out;

	list_for_each_entry(ir, &svm->ir_list, node) {
		if (activate)
			ret = amd_iommu_activate_guest_mode(ir->data);
		else
			ret = amd_iommu_deactivate_guest_mode(ir->data);
		if (ret)
			break;
	}
out:
	spin_unlock_irqrestore(&svm->ir_list_lock, flags);
	return ret;
}

5199
static void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
5200
{
5201 5202
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb;
5203
	bool activated = kvm_vcpu_apicv_active(vcpu);
5204

5205 5206 5207 5208 5209 5210 5211 5212 5213
	if (activated) {
		/**
		 * During AVIC temporary deactivation, guest could update
		 * APIC ID, DFR and LDR registers, which would not be trapped
		 * by avic_unaccelerated_access_interception(). In this case,
		 * we need to check and update the AVIC logical APIC ID table
		 * accordingly before re-activating.
		 */
		avic_post_state_restore(vcpu);
5214
		vmcb->control.int_ctl |= AVIC_ENABLE_MASK;
5215
	} else {
5216
		vmcb->control.int_ctl &= ~AVIC_ENABLE_MASK;
5217
	}
5218
	mark_dirty(vmcb, VMCB_AVIC);
5219 5220

	svm_set_pi_irte_mode(vcpu, activated);
5221 5222
}

5223
static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
5224 5225 5226 5227
{
	return;
}

5228 5229 5230 5231 5232
static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
{
	kvm_lapic_set_irr(vec, vcpu->arch.apic);
	smp_mb__after_atomic();

5233 5234 5235 5236 5237 5238 5239
	if (avic_vcpu_is_running(vcpu)) {
		int cpuid = vcpu->cpu;

		if (cpuid != get_cpu())
			wrmsrl(SVM_AVIC_DOORBELL, kvm_cpu_get_apicid(cpuid));
		put_cpu();
	} else
5240 5241 5242
		kvm_vcpu_wake_up(vcpu);
}

5243 5244 5245 5246 5247
static bool svm_dy_apicv_has_pending_interrupt(struct kvm_vcpu *vcpu)
{
	return false;
}

5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293
static void svm_ir_list_del(struct vcpu_svm *svm, struct amd_iommu_pi_data *pi)
{
	unsigned long flags;
	struct amd_svm_iommu_ir *cur;

	spin_lock_irqsave(&svm->ir_list_lock, flags);
	list_for_each_entry(cur, &svm->ir_list, node) {
		if (cur->data != pi->ir_data)
			continue;
		list_del(&cur->node);
		kfree(cur);
		break;
	}
	spin_unlock_irqrestore(&svm->ir_list_lock, flags);
}

static int svm_ir_list_add(struct vcpu_svm *svm, struct amd_iommu_pi_data *pi)
{
	int ret = 0;
	unsigned long flags;
	struct amd_svm_iommu_ir *ir;

	/**
	 * In some cases, the existing irte is updaed and re-set,
	 * so we need to check here if it's already been * added
	 * to the ir_list.
	 */
	if (pi->ir_data && (pi->prev_ga_tag != 0)) {
		struct kvm *kvm = svm->vcpu.kvm;
		u32 vcpu_id = AVIC_GATAG_TO_VCPUID(pi->prev_ga_tag);
		struct kvm_vcpu *prev_vcpu = kvm_get_vcpu_by_id(kvm, vcpu_id);
		struct vcpu_svm *prev_svm;

		if (!prev_vcpu) {
			ret = -EINVAL;
			goto out;
		}

		prev_svm = to_svm(prev_vcpu);
		svm_ir_list_del(prev_svm, pi);
	}

	/**
	 * Allocating new amd_iommu_pi_data, which will get
	 * add to the per-vcpu ir_list.
	 */
5294
	ir = kzalloc(sizeof(struct amd_svm_iommu_ir), GFP_KERNEL_ACCOUNT);
5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327
	if (!ir) {
		ret = -ENOMEM;
		goto out;
	}
	ir->data = pi->ir_data;

	spin_lock_irqsave(&svm->ir_list_lock, flags);
	list_add(&ir->node, &svm->ir_list);
	spin_unlock_irqrestore(&svm->ir_list_lock, flags);
out:
	return ret;
}

/**
 * Note:
 * The HW cannot support posting multicast/broadcast
 * interrupts to a vCPU. So, we still use legacy interrupt
 * remapping for these kind of interrupts.
 *
 * For lowest-priority interrupts, we only support
 * those with single CPU as the destination, e.g. user
 * configures the interrupts via /proc/irq or uses
 * irqbalance to make the interrupts single-CPU.
 */
static int
get_pi_vcpu_info(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e,
		 struct vcpu_data *vcpu_info, struct vcpu_svm **svm)
{
	struct kvm_lapic_irq irq;
	struct kvm_vcpu *vcpu = NULL;

	kvm_set_msi_irq(kvm, e, &irq);

5328 5329
	if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu) ||
	    !kvm_irq_is_postable(&irq)) {
5330 5331 5332 5333 5334 5335 5336 5337
		pr_debug("SVM: %s: use legacy intr remap mode for irq %u\n",
			 __func__, irq.vector);
		return -1;
	}

	pr_debug("SVM: %s: use GA mode for irq %u\n", __func__,
		 irq.vector);
	*svm = to_svm(vcpu);
5338
	vcpu_info->pi_desc_addr = __sme_set(page_to_phys((*svm)->avic_backing_page));
5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354 5355 5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381 5382
	vcpu_info->vector = irq.vector;

	return 0;
}

/*
 * svm_update_pi_irte - set IRTE for Posted-Interrupts
 *
 * @kvm: kvm
 * @host_irq: host irq of the interrupt
 * @guest_irq: gsi of the interrupt
 * @set: set or unset PI
 * returns 0 on success, < 0 on failure
 */
static int svm_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
			      uint32_t guest_irq, bool set)
{
	struct kvm_kernel_irq_routing_entry *e;
	struct kvm_irq_routing_table *irq_rt;
	int idx, ret = -EINVAL;

	if (!kvm_arch_has_assigned_device(kvm) ||
	    !irq_remapping_cap(IRQ_POSTING_CAP))
		return 0;

	pr_debug("SVM: %s: host_irq=%#x, guest_irq=%#x, set=%#x\n",
		 __func__, host_irq, guest_irq, set);

	idx = srcu_read_lock(&kvm->irq_srcu);
	irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
	WARN_ON(guest_irq >= irq_rt->nr_rt_entries);

	hlist_for_each_entry(e, &irq_rt->map[guest_irq], link) {
		struct vcpu_data vcpu_info;
		struct vcpu_svm *svm = NULL;

		if (e->type != KVM_IRQ_ROUTING_MSI)
			continue;

		/**
		 * Here, we setup with legacy mode in the following cases:
		 * 1. When cannot target interrupt to a specific vcpu.
		 * 2. Unsetting posted interrupt.
		 * 3. APIC virtialization is disabled for the vcpu.
5383
		 * 4. IRQ has incompatible delivery mode (SMI, INIT, etc)
5384 5385 5386 5387 5388 5389
		 */
		if (!get_pi_vcpu_info(kvm, e, &vcpu_info, &svm) && set &&
		    kvm_vcpu_apicv_active(&svm->vcpu)) {
			struct amd_iommu_pi_data pi;

			/* Try to enable guest_mode in IRTE */
5390 5391
			pi.base = __sme_set(page_to_phys(svm->avic_backing_page) &
					    AVIC_HPA_MASK);
5392
			pi.ga_tag = AVIC_GATAG(to_kvm_svm(kvm)->avic_vm_id,
5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435
						     svm->vcpu.vcpu_id);
			pi.is_guest_mode = true;
			pi.vcpu_data = &vcpu_info;
			ret = irq_set_vcpu_affinity(host_irq, &pi);

			/**
			 * Here, we successfully setting up vcpu affinity in
			 * IOMMU guest mode. Now, we need to store the posted
			 * interrupt information in a per-vcpu ir_list so that
			 * we can reference to them directly when we update vcpu
			 * scheduling information in IOMMU irte.
			 */
			if (!ret && pi.is_guest_mode)
				svm_ir_list_add(svm, &pi);
		} else {
			/* Use legacy mode in IRTE */
			struct amd_iommu_pi_data pi;

			/**
			 * Here, pi is used to:
			 * - Tell IOMMU to use legacy mode for this interrupt.
			 * - Retrieve ga_tag of prior interrupt remapping data.
			 */
			pi.is_guest_mode = false;
			ret = irq_set_vcpu_affinity(host_irq, &pi);

			/**
			 * Check if the posted interrupt was previously
			 * setup with the guest_mode by checking if the ga_tag
			 * was cached. If so, we need to clean up the per-vcpu
			 * ir_list.
			 */
			if (!ret && pi.prev_ga_tag) {
				int id = AVIC_GATAG_TO_VCPUID(pi.prev_ga_tag);
				struct kvm_vcpu *vcpu;

				vcpu = kvm_get_vcpu_by_id(kvm, id);
				if (vcpu)
					svm_ir_list_del(to_svm(vcpu), &pi);
			}
		}

		if (!ret && svm) {
5436 5437
			trace_kvm_pi_irte_update(host_irq, svm->vcpu.vcpu_id,
						 e->gsi, vcpu_info.vector,
5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449 5450 5451 5452
						 vcpu_info.pi_desc_addr, set);
		}

		if (ret < 0) {
			pr_err("%s: failed to update PI IRTE\n", __func__);
			goto out;
		}
	}

	ret = 0;
out:
	srcu_read_unlock(&kvm->irq_srcu, idx);
	return ret;
}

5453 5454 5455 5456
static int svm_nmi_allowed(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb;
J
Joerg Roedel 已提交
5457 5458 5459 5460 5461 5462
	int ret;
	ret = !(vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK) &&
	      !(svm->vcpu.arch.hflags & HF_NMI_MASK);
	ret = ret && gif_set(svm) && nested_svm_nmi(svm);

	return ret;
5463 5464
}

J
Jan Kiszka 已提交
5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477
static bool svm_get_nmi_mask(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	return !!(svm->vcpu.arch.hflags & HF_NMI_MASK);
}

static void svm_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (masked) {
		svm->vcpu.arch.hflags |= HF_NMI_MASK;
5478
		set_intercept(svm, INTERCEPT_IRET);
J
Jan Kiszka 已提交
5479 5480
	} else {
		svm->vcpu.arch.hflags &= ~HF_NMI_MASK;
5481
		clr_intercept(svm, INTERCEPT_IRET);
J
Jan Kiszka 已提交
5482 5483 5484
	}
}

5485 5486 5487 5488
static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb;
5489 5490 5491 5492 5493 5494
	int ret;

	if (!gif_set(svm) ||
	     (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK))
		return 0;

5495
	ret = !!(kvm_get_rflags(vcpu) & X86_EFLAGS_IF);
5496

5497
	if (is_guest_mode(vcpu))
5498 5499 5500
		return ret && !(svm->vcpu.arch.hflags & HF_VINTR_MASK);

	return ret;
5501 5502
}

5503
static void enable_irq_window(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
5504
{
5505 5506
	struct vcpu_svm *svm = to_svm(vcpu);

5507 5508 5509
	if (kvm_vcpu_apicv_active(vcpu))
		return;

J
Joerg Roedel 已提交
5510 5511 5512 5513
	/*
	 * In case GIF=0 we can't rely on the CPU to tell us when GIF becomes
	 * 1, because that's a separate STGI/VMRUN intercept.  The next time we
	 * get that intercept, this function will be called again though and
5514 5515 5516
	 * we'll get the vintr intercept. However, if the vGIF feature is
	 * enabled, the STGI interception will not occur. Enable the irq
	 * window under the assumption that the hardware will set the GIF.
J
Joerg Roedel 已提交
5517
	 */
5518
	if ((vgif_enabled(svm) || gif_set(svm)) && nested_svm_intr(svm)) {
5519 5520 5521
		svm_set_vintr(svm);
		svm_inject_irq(svm, 0x0);
	}
5522 5523
}

5524
static void enable_nmi_window(struct kvm_vcpu *vcpu)
5525
{
5526
	struct vcpu_svm *svm = to_svm(vcpu);
5527

5528 5529
	if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
	    == HF_NMI_MASK)
5530
		return; /* IRET will cause a vm exit */
5531

5532 5533 5534
	if (!gif_set(svm)) {
		if (vgif_enabled(svm))
			set_intercept(svm, INTERCEPT_STGI);
5535
		return; /* STGI will cause a vm exit */
5536
	}
5537 5538 5539 5540

	if (svm->nested.exit_required)
		return; /* we're not going to run the guest yet */

J
Joerg Roedel 已提交
5541 5542 5543 5544
	/*
	 * Something prevents NMI from been injected. Single step over possible
	 * problem (IRET or exception injection or interrupt shadow)
	 */
5545
	svm->nmi_singlestep_guest_rflags = svm_get_rflags(vcpu);
J
Jan Kiszka 已提交
5546
	svm->nmi_singlestep = true;
5547
	svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
5548 5549
}

5550 5551 5552 5553 5554
static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
{
	return 0;
}

5555 5556 5557 5558 5559
static int svm_set_identity_map_addr(struct kvm *kvm, u64 ident_addr)
{
	return 0;
}

5560
static void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa)
5561
{
5562 5563 5564 5565 5566 5567
	struct vcpu_svm *svm = to_svm(vcpu);

	if (static_cpu_has(X86_FEATURE_FLUSHBYASID))
		svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
	else
		svm->asid_generation--;
5568 5569
}

5570 5571 5572 5573 5574 5575 5576
static void svm_flush_tlb_gva(struct kvm_vcpu *vcpu, gva_t gva)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	invlpga(gva, svm->vmcb->control.asid);
}

5577 5578 5579 5580
static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
{
}

5581 5582 5583 5584
static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

5585
	if (svm_nested_virtualize_tpr(vcpu))
5586 5587
		return;

5588
	if (!is_cr_intercept(svm, INTERCEPT_CR8_WRITE)) {
5589
		int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
5590
		kvm_set_cr8(vcpu, cr8);
5591 5592 5593
	}
}

5594 5595 5596 5597 5598
static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 cr8;

5599 5600
	if (svm_nested_virtualize_tpr(vcpu) ||
	    kvm_vcpu_apicv_active(vcpu))
5601 5602
		return;

5603 5604 5605 5606 5607
	cr8 = kvm_get_cr8(vcpu);
	svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
	svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
}

5608 5609 5610 5611 5612
static void svm_complete_interrupts(struct vcpu_svm *svm)
{
	u8 vector;
	int type;
	u32 exitintinfo = svm->vmcb->control.exit_int_info;
5613 5614 5615
	unsigned int3_injected = svm->int3_injected;

	svm->int3_injected = 0;
5616

5617 5618 5619 5620 5621 5622
	/*
	 * If we've made progress since setting HF_IRET_MASK, we've
	 * executed an IRET and can allow NMI injection.
	 */
	if ((svm->vcpu.arch.hflags & HF_IRET_MASK)
	    && kvm_rip_read(&svm->vcpu) != svm->nmi_iret_rip) {
5623
		svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
5624 5625
		kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
	}
5626

5627 5628 5629 5630 5631 5632 5633
	svm->vcpu.arch.nmi_injected = false;
	kvm_clear_exception_queue(&svm->vcpu);
	kvm_clear_interrupt_queue(&svm->vcpu);

	if (!(exitintinfo & SVM_EXITINTINFO_VALID))
		return;

5634 5635
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);

5636 5637 5638 5639 5640 5641 5642 5643
	vector = exitintinfo & SVM_EXITINTINFO_VEC_MASK;
	type = exitintinfo & SVM_EXITINTINFO_TYPE_MASK;

	switch (type) {
	case SVM_EXITINTINFO_TYPE_NMI:
		svm->vcpu.arch.nmi_injected = true;
		break;
	case SVM_EXITINTINFO_TYPE_EXEPT:
5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654
		/*
		 * In case of software exceptions, do not reinject the vector,
		 * but re-execute the instruction instead. Rewind RIP first
		 * if we emulated INT3 before.
		 */
		if (kvm_exception_is_soft(vector)) {
			if (vector == BP_VECTOR && int3_injected &&
			    kvm_is_linear_rip(&svm->vcpu, svm->int3_rip))
				kvm_rip_write(&svm->vcpu,
					      kvm_rip_read(&svm->vcpu) -
					      int3_injected);
5655
			break;
5656
		}
5657 5658
		if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
			u32 err = svm->vmcb->control.exit_int_info_err;
5659
			kvm_requeue_exception_e(&svm->vcpu, vector, err);
5660 5661

		} else
5662
			kvm_requeue_exception(&svm->vcpu, vector);
5663 5664
		break;
	case SVM_EXITINTINFO_TYPE_INTR:
5665
		kvm_queue_interrupt(&svm->vcpu, vector, false);
5666 5667 5668 5669 5670 5671
		break;
	default:
		break;
	}
}

A
Avi Kivity 已提交
5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682
static void svm_cancel_injection(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;

	control->exit_int_info = control->event_inj;
	control->exit_int_info_err = control->event_inj_err;
	control->event_inj = 0;
	svm_complete_interrupts(svm);
}

A
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5683
static void svm_vcpu_run(struct kvm_vcpu *vcpu)
A
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5684
{
5685
	struct vcpu_svm *svm = to_svm(vcpu);
5686

5687 5688 5689 5690
	svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
	svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
	svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];

5691 5692 5693 5694 5695 5696 5697
	/*
	 * A vmexit emulation is required before the vcpu can be executed
	 * again.
	 */
	if (unlikely(svm->nested.exit_required))
		return;

5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713
	/*
	 * Disable singlestep if we're injecting an interrupt/exception.
	 * We don't want our modified rflags to be pushed on the stack where
	 * we might not be able to easily reset them if we disabled NMI
	 * singlestep later.
	 */
	if (svm->nmi_singlestep && svm->vmcb->control.event_inj) {
		/*
		 * Event injection happens before external interrupts cause a
		 * vmexit and interrupts are disabled here, so smp_send_reschedule
		 * is enough to force an immediate vmexit.
		 */
		disable_nmi_singlestep(svm);
		smp_send_reschedule(vcpu->cpu);
	}

R
Rusty Russell 已提交
5714
	pre_svm_run(svm);
A
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5715

5716 5717
	sync_lapic_to_cr8(vcpu);

5718
	svm->vmcb->save.cr2 = vcpu->arch.cr2;
A
Avi Kivity 已提交
5719

5720
	clgi();
5721
	kvm_load_guest_xsave_state(vcpu);
5722

5723 5724 5725 5726
	if (lapic_in_kernel(vcpu) &&
		vcpu->arch.apic->lapic_timer.timer_advance_ns)
		kvm_wait_lapic_expire(vcpu);

5727 5728 5729 5730 5731 5732
	/*
	 * If this vCPU has touched SPEC_CTRL, restore the guest's value if
	 * it's non-zero. Since vmentry is serialising on affected CPUs, there
	 * is no need to worry about the conditional branch over the wrmsr
	 * being speculatively taken.
	 */
5733
	x86_spec_ctrl_set_guest(svm->spec_ctrl, svm->virt_spec_ctrl);
5734

5735 5736
	local_irq_enable();

A
Avi Kivity 已提交
5737
	asm volatile (
A
Avi Kivity 已提交
5738 5739 5740 5741 5742 5743 5744
		"push %%" _ASM_BP "; \n\t"
		"mov %c[rbx](%[svm]), %%" _ASM_BX " \n\t"
		"mov %c[rcx](%[svm]), %%" _ASM_CX " \n\t"
		"mov %c[rdx](%[svm]), %%" _ASM_DX " \n\t"
		"mov %c[rsi](%[svm]), %%" _ASM_SI " \n\t"
		"mov %c[rdi](%[svm]), %%" _ASM_DI " \n\t"
		"mov %c[rbp](%[svm]), %%" _ASM_BP " \n\t"
5745
#ifdef CONFIG_X86_64
R
Rusty Russell 已提交
5746 5747 5748 5749 5750 5751 5752 5753
		"mov %c[r8](%[svm]),  %%r8  \n\t"
		"mov %c[r9](%[svm]),  %%r9  \n\t"
		"mov %c[r10](%[svm]), %%r10 \n\t"
		"mov %c[r11](%[svm]), %%r11 \n\t"
		"mov %c[r12](%[svm]), %%r12 \n\t"
		"mov %c[r13](%[svm]), %%r13 \n\t"
		"mov %c[r14](%[svm]), %%r14 \n\t"
		"mov %c[r15](%[svm]), %%r15 \n\t"
A
Avi Kivity 已提交
5754 5755 5756
#endif

		/* Enter guest mode */
A
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5757 5758
		"push %%" _ASM_AX " \n\t"
		"mov %c[vmcb](%[svm]), %%" _ASM_AX " \n\t"
5759 5760 5761
		__ex("vmload %%" _ASM_AX) "\n\t"
		__ex("vmrun %%" _ASM_AX) "\n\t"
		__ex("vmsave %%" _ASM_AX) "\n\t"
A
Avi Kivity 已提交
5762
		"pop %%" _ASM_AX " \n\t"
A
Avi Kivity 已提交
5763 5764

		/* Save guest registers, load host registers */
A
Avi Kivity 已提交
5765 5766 5767 5768 5769 5770
		"mov %%" _ASM_BX ", %c[rbx](%[svm]) \n\t"
		"mov %%" _ASM_CX ", %c[rcx](%[svm]) \n\t"
		"mov %%" _ASM_DX ", %c[rdx](%[svm]) \n\t"
		"mov %%" _ASM_SI ", %c[rsi](%[svm]) \n\t"
		"mov %%" _ASM_DI ", %c[rdi](%[svm]) \n\t"
		"mov %%" _ASM_BP ", %c[rbp](%[svm]) \n\t"
5771
#ifdef CONFIG_X86_64
R
Rusty Russell 已提交
5772 5773 5774 5775 5776 5777 5778 5779
		"mov %%r8,  %c[r8](%[svm]) \n\t"
		"mov %%r9,  %c[r9](%[svm]) \n\t"
		"mov %%r10, %c[r10](%[svm]) \n\t"
		"mov %%r11, %c[r11](%[svm]) \n\t"
		"mov %%r12, %c[r12](%[svm]) \n\t"
		"mov %%r13, %c[r13](%[svm]) \n\t"
		"mov %%r14, %c[r14](%[svm]) \n\t"
		"mov %%r15, %c[r15](%[svm]) \n\t"
5780 5781 5782 5783
		/*
		* Clear host registers marked as clobbered to prevent
		* speculative use.
		*/
5784 5785 5786 5787 5788 5789 5790 5791
		"xor %%r8d, %%r8d \n\t"
		"xor %%r9d, %%r9d \n\t"
		"xor %%r10d, %%r10d \n\t"
		"xor %%r11d, %%r11d \n\t"
		"xor %%r12d, %%r12d \n\t"
		"xor %%r13d, %%r13d \n\t"
		"xor %%r14d, %%r14d \n\t"
		"xor %%r15d, %%r15d \n\t"
A
Avi Kivity 已提交
5792
#endif
5793 5794 5795 5796 5797
		"xor %%ebx, %%ebx \n\t"
		"xor %%ecx, %%ecx \n\t"
		"xor %%edx, %%edx \n\t"
		"xor %%esi, %%esi \n\t"
		"xor %%edi, %%edi \n\t"
A
Avi Kivity 已提交
5798
		"pop %%" _ASM_BP
A
Avi Kivity 已提交
5799
		:
R
Rusty Russell 已提交
5800
		: [svm]"a"(svm),
A
Avi Kivity 已提交
5801
		  [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
5802 5803 5804 5805 5806 5807
		  [rbx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBX])),
		  [rcx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RCX])),
		  [rdx]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDX])),
		  [rsi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RSI])),
		  [rdi]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RDI])),
		  [rbp]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_RBP]))
5808
#ifdef CONFIG_X86_64
5809 5810 5811 5812 5813 5814 5815 5816
		  , [r8]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R8])),
		  [r9]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R9])),
		  [r10]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R10])),
		  [r11]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R11])),
		  [r12]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R12])),
		  [r13]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R13])),
		  [r14]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R14])),
		  [r15]"i"(offsetof(struct vcpu_svm, vcpu.arch.regs[VCPU_REGS_R15]))
A
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5817
#endif
5818 5819
		: "cc", "memory"
#ifdef CONFIG_X86_64
A
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5820
		, "rbx", "rcx", "rdx", "rsi", "rdi"
5821
		, "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
A
Avi Kivity 已提交
5822 5823
#else
		, "ebx", "ecx", "edx", "esi", "edi"
5824 5825
#endif
		);
A
Avi Kivity 已提交
5826

5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838
	/* Eliminate branch target predictions from guest mode */
	vmexit_fill_RSB();

#ifdef CONFIG_X86_64
	wrmsrl(MSR_GS_BASE, svm->host.gs_base);
#else
	loadsegment(fs, svm->host.fs);
#ifndef CONFIG_X86_32_LAZY_GS
	loadsegment(gs, svm->host.gs);
#endif
#endif

5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853
	/*
	 * We do not use IBRS in the kernel. If this vCPU has used the
	 * SPEC_CTRL MSR it may have left it on; save the value and
	 * turn it off. This is much more efficient than blindly adding
	 * it to the atomic save/restore list. Especially as the former
	 * (Saving guest MSRs on vmexit) doesn't even exist in KVM.
	 *
	 * For non-nested case:
	 * If the L01 MSR bitmap does not intercept the MSR, then we need to
	 * save it.
	 *
	 * For nested case:
	 * If the L02 MSR bitmap does not intercept the MSR, then we need to
	 * save it.
	 */
5854
	if (unlikely(!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL)))
5855
		svm->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL);
5856

A
Avi Kivity 已提交
5857 5858
	reload_tss(vcpu);

5859 5860
	local_irq_disable();

5861 5862
	x86_spec_ctrl_restore_host(svm->spec_ctrl, svm->virt_spec_ctrl);

5863 5864 5865 5866 5867
	vcpu->arch.cr2 = svm->vmcb->save.cr2;
	vcpu->arch.regs[VCPU_REGS_RAX] = svm->vmcb->save.rax;
	vcpu->arch.regs[VCPU_REGS_RSP] = svm->vmcb->save.rsp;
	vcpu->arch.regs[VCPU_REGS_RIP] = svm->vmcb->save.rip;

5868
	if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
5869
		kvm_before_interrupt(&svm->vcpu);
5870

5871
	kvm_load_host_xsave_state(vcpu);
5872 5873 5874 5875 5876
	stgi();

	/* Any pending NMI will happen here */

	if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
5877
		kvm_after_interrupt(&svm->vcpu);
5878

5879 5880
	sync_cr8_to_lapic(vcpu);

5881
	svm->next_rip = 0;
5882

5883 5884
	svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;

G
Gleb Natapov 已提交
5885 5886
	/* if exit due to PF check for async PF */
	if (svm->vmcb->control.exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR)
5887
		svm->vcpu.arch.apf.host_apf_reason = kvm_read_and_reset_pf_reason();
G
Gleb Natapov 已提交
5888

A
Avi Kivity 已提交
5889 5890 5891 5892
	if (npt_enabled) {
		vcpu->arch.regs_avail &= ~(1 << VCPU_EXREG_PDPTR);
		vcpu->arch.regs_dirty &= ~(1 << VCPU_EXREG_PDPTR);
	}
5893 5894 5895 5896 5897 5898 5899 5900

	/*
	 * We need to handle MC intercepts here before the vcpu has a chance to
	 * change the physical cpu
	 */
	if (unlikely(svm->vmcb->control.exit_code ==
		     SVM_EXIT_EXCP_BASE + MC_VECTOR))
		svm_handle_mce(svm);
5901 5902

	mark_all_clean(svm->vmcb);
A
Avi Kivity 已提交
5903
}
5904
STACK_FRAME_NON_STANDARD(svm_vcpu_run);
A
Avi Kivity 已提交
5905 5906 5907

static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
5908 5909
	struct vcpu_svm *svm = to_svm(vcpu);

5910
	svm->vmcb->save.cr3 = __sme_set(root);
5911
	mark_dirty(svm->vmcb, VMCB_CR);
A
Avi Kivity 已提交
5912 5913
}

5914 5915 5916 5917
static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
	struct vcpu_svm *svm = to_svm(vcpu);

5918
	svm->vmcb->control.nested_cr3 = __sme_set(root);
5919
	mark_dirty(svm->vmcb, VMCB_NPT);
5920 5921

	/* Also sync guest cr3 here in case we live migrate */
5922
	svm->vmcb->save.cr3 = kvm_read_cr3(vcpu);
5923
	mark_dirty(svm->vmcb, VMCB_CR);
5924 5925
}

A
Avi Kivity 已提交
5926 5927
static int is_disabled(void)
{
5928 5929 5930 5931 5932 5933
	u64 vm_cr;

	rdmsrl(MSR_VM_CR, vm_cr);
	if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE))
		return 1;

A
Avi Kivity 已提交
5934 5935 5936
	return 0;
}

I
Ingo Molnar 已提交
5937 5938 5939 5940 5941 5942 5943 5944 5945 5946 5947
static void
svm_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
{
	/*
	 * Patch in the VMMCALL instruction:
	 */
	hypercall[0] = 0x0f;
	hypercall[1] = 0x01;
	hypercall[2] = 0xd9;
}

5948
static int __init svm_check_processor_compat(void)
Y
Yang, Sheng 已提交
5949
{
5950
	return 0;
Y
Yang, Sheng 已提交
5951 5952
}

5953 5954 5955 5956 5957
static bool svm_cpu_has_accelerated_tpr(void)
{
	return false;
}

5958
static bool svm_has_emulated_msr(int index)
5959
{
5960 5961
	switch (index) {
	case MSR_IA32_MCG_EXT_CTL:
5962
	case MSR_IA32_VMX_BASIC ... MSR_IA32_VMX_VMFUNC:
5963 5964 5965 5966 5967
		return false;
	default:
		break;
	}

5968 5969 5970
	return true;
}

5971 5972 5973 5974 5975
static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
{
	return 0;
}

5976 5977
static void svm_cpuid_update(struct kvm_vcpu *vcpu)
{
5978 5979
	struct vcpu_svm *svm = to_svm(vcpu);

5980
	vcpu->arch.xsaves_enabled = guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) &&
5981
				    boot_cpu_has(X86_FEATURE_XSAVE) &&
5982 5983
				    boot_cpu_has(X86_FEATURE_XSAVES);

5984
	/* Update nrips enabled cache */
5985
	svm->nrips_enabled = !!guest_cpuid_has(&svm->vcpu, X86_FEATURE_NRIPS);
5986 5987 5988 5989

	if (!kvm_vcpu_apicv_active(vcpu))
		return;

5990
	guest_cpuid_clear(vcpu, X86_FEATURE_X2APIC);
5991 5992
}

5993
#define F feature_bit
5994

5995 5996
static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
{
5997
	switch (func) {
5998 5999
	case 0x1:
		if (avic)
6000
			entry->ecx &= ~F(X2APIC);
6001
		break;
6002 6003 6004 6005
	case 0x80000001:
		if (nested)
			entry->ecx |= (1 << 2); /* Set SVM bit */
		break;
6006 6007 6008 6009 6010
	case 0x80000008:
		if (boot_cpu_has(X86_FEATURE_LS_CFG_SSBD) ||
		     boot_cpu_has(X86_FEATURE_AMD_SSBD))
			entry->ebx |= F(VIRT_SSBD);
		break;
6011 6012 6013 6014 6015
	case 0x8000000A:
		entry->eax = 1; /* SVM revision 1 */
		entry->ebx = 8; /* Lets support 8 ASIDs in case we add proper
				   ASID emulation to nested SVM */
		entry->ecx = 0; /* Reserved */
6016 6017 6018 6019
		entry->edx = 0; /* Per default do not support any
				   additional features */

		/* Support next_rip if host supports it */
6020
		if (boot_cpu_has(X86_FEATURE_NRIPS))
6021
			entry->edx |= F(NRIPS);
6022

6023 6024
		/* Support NPT for the guest if enabled */
		if (npt_enabled)
6025
			entry->edx |= F(NPT);
6026

6027
	}
6028 6029
}

6030
static int svm_get_lpage_level(void)
6031
{
6032
	return PT_PDPE_LEVEL;
6033 6034
}

6035 6036
static bool svm_rdtscp_supported(void)
{
P
Paolo Bonzini 已提交
6037
	return boot_cpu_has(X86_FEATURE_RDTSCP);
6038 6039
}

6040 6041 6042 6043 6044
static bool svm_invpcid_supported(void)
{
	return false;
}

6045 6046 6047 6048 6049
static bool svm_mpx_supported(void)
{
	return false;
}

6050 6051
static bool svm_xsaves_supported(void)
{
6052
	return boot_cpu_has(X86_FEATURE_XSAVES);
6053 6054
}

6055 6056 6057 6058 6059
static bool svm_umip_emulated(void)
{
	return false;
}

6060 6061 6062 6063 6064
static bool svm_pt_supported(void)
{
	return false;
}

6065 6066 6067 6068 6069
static bool svm_has_wbinvd_exit(void)
{
	return true;
}

6070 6071 6072 6073 6074
static bool svm_pku_supported(void)
{
	return false;
}

6075
#define PRE_EX(exit)  { .exit_code = (exit), \
6076
			.stage = X86_ICPT_PRE_EXCEPT, }
6077
#define POST_EX(exit) { .exit_code = (exit), \
6078
			.stage = X86_ICPT_POST_EXCEPT, }
6079
#define POST_MEM(exit) { .exit_code = (exit), \
6080
			.stage = X86_ICPT_POST_MEMACCESS, }
6081

6082
static const struct __x86_intercept {
6083 6084 6085 6086 6087 6088 6089 6090
	u32 exit_code;
	enum x86_intercept_stage stage;
} x86_intercept_map[] = {
	[x86_intercept_cr_read]		= POST_EX(SVM_EXIT_READ_CR0),
	[x86_intercept_cr_write]	= POST_EX(SVM_EXIT_WRITE_CR0),
	[x86_intercept_clts]		= POST_EX(SVM_EXIT_WRITE_CR0),
	[x86_intercept_lmsw]		= POST_EX(SVM_EXIT_WRITE_CR0),
	[x86_intercept_smsw]		= POST_EX(SVM_EXIT_READ_CR0),
6091 6092
	[x86_intercept_dr_read]		= POST_EX(SVM_EXIT_READ_DR0),
	[x86_intercept_dr_write]	= POST_EX(SVM_EXIT_WRITE_DR0),
6093 6094 6095 6096 6097 6098 6099 6100
	[x86_intercept_sldt]		= POST_EX(SVM_EXIT_LDTR_READ),
	[x86_intercept_str]		= POST_EX(SVM_EXIT_TR_READ),
	[x86_intercept_lldt]		= POST_EX(SVM_EXIT_LDTR_WRITE),
	[x86_intercept_ltr]		= POST_EX(SVM_EXIT_TR_WRITE),
	[x86_intercept_sgdt]		= POST_EX(SVM_EXIT_GDTR_READ),
	[x86_intercept_sidt]		= POST_EX(SVM_EXIT_IDTR_READ),
	[x86_intercept_lgdt]		= POST_EX(SVM_EXIT_GDTR_WRITE),
	[x86_intercept_lidt]		= POST_EX(SVM_EXIT_IDTR_WRITE),
6101 6102 6103 6104 6105 6106 6107 6108
	[x86_intercept_vmrun]		= POST_EX(SVM_EXIT_VMRUN),
	[x86_intercept_vmmcall]		= POST_EX(SVM_EXIT_VMMCALL),
	[x86_intercept_vmload]		= POST_EX(SVM_EXIT_VMLOAD),
	[x86_intercept_vmsave]		= POST_EX(SVM_EXIT_VMSAVE),
	[x86_intercept_stgi]		= POST_EX(SVM_EXIT_STGI),
	[x86_intercept_clgi]		= POST_EX(SVM_EXIT_CLGI),
	[x86_intercept_skinit]		= POST_EX(SVM_EXIT_SKINIT),
	[x86_intercept_invlpga]		= POST_EX(SVM_EXIT_INVLPGA),
6109 6110 6111
	[x86_intercept_rdtscp]		= POST_EX(SVM_EXIT_RDTSCP),
	[x86_intercept_monitor]		= POST_MEM(SVM_EXIT_MONITOR),
	[x86_intercept_mwait]		= POST_EX(SVM_EXIT_MWAIT),
6112 6113 6114 6115 6116 6117 6118 6119 6120
	[x86_intercept_invlpg]		= POST_EX(SVM_EXIT_INVLPG),
	[x86_intercept_invd]		= POST_EX(SVM_EXIT_INVD),
	[x86_intercept_wbinvd]		= POST_EX(SVM_EXIT_WBINVD),
	[x86_intercept_wrmsr]		= POST_EX(SVM_EXIT_MSR),
	[x86_intercept_rdtsc]		= POST_EX(SVM_EXIT_RDTSC),
	[x86_intercept_rdmsr]		= POST_EX(SVM_EXIT_MSR),
	[x86_intercept_rdpmc]		= POST_EX(SVM_EXIT_RDPMC),
	[x86_intercept_cpuid]		= PRE_EX(SVM_EXIT_CPUID),
	[x86_intercept_rsm]		= PRE_EX(SVM_EXIT_RSM),
6121 6122 6123 6124 6125 6126 6127
	[x86_intercept_pause]		= PRE_EX(SVM_EXIT_PAUSE),
	[x86_intercept_pushf]		= PRE_EX(SVM_EXIT_PUSHF),
	[x86_intercept_popf]		= PRE_EX(SVM_EXIT_POPF),
	[x86_intercept_intn]		= PRE_EX(SVM_EXIT_SWINT),
	[x86_intercept_iret]		= PRE_EX(SVM_EXIT_IRET),
	[x86_intercept_icebp]		= PRE_EX(SVM_EXIT_ICEBP),
	[x86_intercept_hlt]		= POST_EX(SVM_EXIT_HLT),
6128 6129 6130 6131
	[x86_intercept_in]		= POST_EX(SVM_EXIT_IOIO),
	[x86_intercept_ins]		= POST_EX(SVM_EXIT_IOIO),
	[x86_intercept_out]		= POST_EX(SVM_EXIT_IOIO),
	[x86_intercept_outs]		= POST_EX(SVM_EXIT_IOIO),
6132
	[x86_intercept_xsetbv]		= PRE_EX(SVM_EXIT_XSETBV),
6133 6134
};

6135
#undef PRE_EX
6136
#undef POST_EX
6137
#undef POST_MEM
6138

6139 6140 6141 6142
static int svm_check_intercept(struct kvm_vcpu *vcpu,
			       struct x86_instruction_info *info,
			       enum x86_intercept_stage stage)
{
6143 6144 6145 6146 6147 6148 6149 6150 6151 6152
	struct vcpu_svm *svm = to_svm(vcpu);
	int vmexit, ret = X86EMUL_CONTINUE;
	struct __x86_intercept icpt_info;
	struct vmcb *vmcb = svm->vmcb;

	if (info->intercept >= ARRAY_SIZE(x86_intercept_map))
		goto out;

	icpt_info = x86_intercept_map[info->intercept];

6153
	if (stage != icpt_info.stage)
6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167
		goto out;

	switch (icpt_info.exit_code) {
	case SVM_EXIT_READ_CR0:
		if (info->intercept == x86_intercept_cr_read)
			icpt_info.exit_code += info->modrm_reg;
		break;
	case SVM_EXIT_WRITE_CR0: {
		unsigned long cr0, val;
		u64 intercept;

		if (info->intercept == x86_intercept_cr_write)
			icpt_info.exit_code += info->modrm_reg;

6168 6169
		if (icpt_info.exit_code != SVM_EXIT_WRITE_CR0 ||
		    info->intercept == x86_intercept_clts)
6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192
			break;

		intercept = svm->nested.intercept;

		if (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0)))
			break;

		cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK;
		val = info->src_val  & ~SVM_CR0_SELECTIVE_MASK;

		if (info->intercept == x86_intercept_lmsw) {
			cr0 &= 0xfUL;
			val &= 0xfUL;
			/* lmsw can't clear PE - catch this here */
			if (cr0 & X86_CR0_PE)
				val |= X86_CR0_PE;
		}

		if (cr0 ^ val)
			icpt_info.exit_code = SVM_EXIT_CR0_SEL_WRITE;

		break;
	}
6193 6194 6195 6196
	case SVM_EXIT_READ_DR0:
	case SVM_EXIT_WRITE_DR0:
		icpt_info.exit_code += info->modrm_reg;
		break;
6197 6198 6199 6200 6201 6202
	case SVM_EXIT_MSR:
		if (info->intercept == x86_intercept_wrmsr)
			vmcb->control.exit_info_1 = 1;
		else
			vmcb->control.exit_info_1 = 0;
		break;
6203 6204 6205 6206 6207 6208 6209
	case SVM_EXIT_PAUSE:
		/*
		 * We get this for NOP only, but pause
		 * is rep not, check this here
		 */
		if (info->rep_prefix != REPE_PREFIX)
			goto out;
6210
		break;
6211 6212 6213 6214 6215 6216
	case SVM_EXIT_IOIO: {
		u64 exit_info;
		u32 bytes;

		if (info->intercept == x86_intercept_in ||
		    info->intercept == x86_intercept_ins) {
6217 6218
			exit_info = ((info->src_val & 0xffff) << 16) |
				SVM_IOIO_TYPE_MASK;
6219
			bytes = info->dst_bytes;
6220
		} else {
6221
			exit_info = (info->dst_val & 0xffff) << 16;
6222
			bytes = info->src_bytes;
6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237 6238 6239 6240 6241 6242
		}

		if (info->intercept == x86_intercept_outs ||
		    info->intercept == x86_intercept_ins)
			exit_info |= SVM_IOIO_STR_MASK;

		if (info->rep_prefix)
			exit_info |= SVM_IOIO_REP_MASK;

		bytes = min(bytes, 4u);

		exit_info |= bytes << SVM_IOIO_SIZE_SHIFT;

		exit_info |= (u32)info->ad_bytes << (SVM_IOIO_ASIZE_SHIFT - 1);

		vmcb->control.exit_info_1 = exit_info;
		vmcb->control.exit_info_2 = info->next_rip;

		break;
	}
6243 6244 6245 6246
	default:
		break;
	}

6247 6248 6249
	/* TODO: Advertise NRIPS to guest hypervisor unconditionally */
	if (static_cpu_has(X86_FEATURE_NRIPS))
		vmcb->control.next_rip  = info->next_rip;
6250 6251 6252 6253 6254 6255 6256 6257
	vmcb->control.exit_code = icpt_info.exit_code;
	vmexit = nested_svm_exit_handled(svm);

	ret = (vmexit == NESTED_EXIT_DONE) ? X86EMUL_INTERCEPTED
					   : X86EMUL_CONTINUE;

out:
	return ret;
6258 6259
}

6260 6261
static void svm_handle_exit_irqoff(struct kvm_vcpu *vcpu,
	enum exit_fastpath_completion *exit_fastpath)
6262
{
6263 6264 6265
	if (!is_guest_mode(vcpu) &&
		to_svm(vcpu)->vmcb->control.exit_code == EXIT_REASON_MSR_WRITE)
		*exit_fastpath = handle_fastpath_set_msr_irqoff(vcpu);
6266 6267
}

6268 6269
static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
{
6270 6271
	if (pause_filter_thresh)
		shrink_ple_window(vcpu);
6272 6273
}

6274 6275 6276 6277
static inline void avic_post_state_restore(struct kvm_vcpu *vcpu)
{
	if (avic_handle_apic_id_update(vcpu) != 0)
		return;
6278
	avic_handle_dfr_update(vcpu);
6279 6280 6281
	avic_handle_ldr_update(vcpu);
}

6282 6283 6284 6285 6286 6287
static void svm_setup_mce(struct kvm_vcpu *vcpu)
{
	/* [63:9] are reserved. */
	vcpu->arch.mcg_cap &= 0x1ff;
}

6288 6289
static int svm_smi_allowed(struct kvm_vcpu *vcpu)
{
6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303
	struct vcpu_svm *svm = to_svm(vcpu);

	/* Per APM Vol.2 15.22.2 "Response to SMI" */
	if (!gif_set(svm))
		return 0;

	if (is_guest_mode(&svm->vcpu) &&
	    svm->nested.intercept & (1ULL << INTERCEPT_SMI)) {
		/* TODO: Might need to set exit_info_1 and exit_info_2 here */
		svm->vmcb->control.exit_code = SVM_EXIT_SMI;
		svm->nested.exit_required = true;
		return 0;
	}

6304 6305 6306
	return 1;
}

6307 6308
static int svm_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
{
6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325
	struct vcpu_svm *svm = to_svm(vcpu);
	int ret;

	if (is_guest_mode(vcpu)) {
		/* FED8h - SVM Guest */
		put_smstate(u64, smstate, 0x7ed8, 1);
		/* FEE0h - SVM Guest VMCB Physical Address */
		put_smstate(u64, smstate, 0x7ee0, svm->nested.vmcb);

		svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
		svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
		svm->vmcb->save.rip = vcpu->arch.regs[VCPU_REGS_RIP];

		ret = nested_svm_vmexit(svm);
		if (ret)
			return ret;
	}
6326 6327 6328
	return 0;
}

6329
static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
6330
{
6331 6332
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *nested_vmcb;
6333
	struct kvm_host_map map;
6334 6335
	u64 guest;
	u64 vmcb;
6336

6337 6338
	guest = GET_SMSTATE(u64, smstate, 0x7ed8);
	vmcb = GET_SMSTATE(u64, smstate, 0x7ee0);
6339

6340
	if (guest) {
6341
		if (kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb), &map) == -EINVAL)
6342
			return 1;
6343 6344
		nested_vmcb = map.hva;
		enter_svm_guest_mode(svm, vmcb, nested_vmcb, &map);
6345
	}
6346
	return 0;
6347 6348
}

6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361
static int enable_smi_window(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!gif_set(svm)) {
		if (vgif_enabled(svm))
			set_intercept(svm, INTERCEPT_STGI);
		/* STGI will cause a vm exit */
		return 1;
	}
	return 0;
}

6362 6363 6364 6365 6366 6367 6368 6369 6370 6371 6372 6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403
static int sev_flush_asids(void)
{
	int ret, error;

	/*
	 * DEACTIVATE will clear the WBINVD indicator causing DF_FLUSH to fail,
	 * so it must be guarded.
	 */
	down_write(&sev_deactivate_lock);

	wbinvd_on_all_cpus();
	ret = sev_guest_df_flush(&error);

	up_write(&sev_deactivate_lock);

	if (ret)
		pr_err("SEV: DF_FLUSH failed, ret=%d, error=%#x\n", ret, error);

	return ret;
}

/* Must be called with the sev_bitmap_lock held */
static bool __sev_recycle_asids(void)
{
	int pos;

	/* Check if there are any ASIDs to reclaim before performing a flush */
	pos = find_next_bit(sev_reclaim_asid_bitmap,
			    max_sev_asid, min_sev_asid - 1);
	if (pos >= max_sev_asid)
		return false;

	if (sev_flush_asids())
		return false;

	bitmap_xor(sev_asid_bitmap, sev_asid_bitmap, sev_reclaim_asid_bitmap,
		   max_sev_asid);
	bitmap_zero(sev_reclaim_asid_bitmap, max_sev_asid);

	return true;
}

B
Brijesh Singh 已提交
6404 6405
static int sev_asid_new(void)
{
6406
	bool retry = true;
B
Brijesh Singh 已提交
6407 6408
	int pos;

6409 6410
	mutex_lock(&sev_bitmap_lock);

B
Brijesh Singh 已提交
6411 6412 6413
	/*
	 * SEV-enabled guest must use asid from min_sev_asid to max_sev_asid.
	 */
6414
again:
B
Brijesh Singh 已提交
6415
	pos = find_next_zero_bit(sev_asid_bitmap, max_sev_asid, min_sev_asid - 1);
6416
	if (pos >= max_sev_asid) {
6417 6418 6419 6420
		if (retry && __sev_recycle_asids()) {
			retry = false;
			goto again;
		}
6421
		mutex_unlock(&sev_bitmap_lock);
B
Brijesh Singh 已提交
6422
		return -EBUSY;
6423 6424 6425 6426 6427
	}

	__set_bit(pos, sev_asid_bitmap);

	mutex_unlock(&sev_bitmap_lock);
B
Brijesh Singh 已提交
6428 6429 6430 6431 6432 6433

	return pos + 1;
}

static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
6434
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
B
Brijesh Singh 已提交
6435 6436 6437
	int asid, ret;

	ret = -EBUSY;
6438 6439 6440
	if (unlikely(sev->active))
		return ret;

B
Brijesh Singh 已提交
6441 6442 6443 6444 6445 6446 6447 6448 6449 6450
	asid = sev_asid_new();
	if (asid < 0)
		return ret;

	ret = sev_platform_init(&argp->error);
	if (ret)
		goto e_free;

	sev->active = true;
	sev->asid = asid;
6451
	INIT_LIST_HEAD(&sev->regions_list);
B
Brijesh Singh 已提交
6452 6453 6454 6455

	return 0;

e_free:
6456
	sev_asid_free(asid);
B
Brijesh Singh 已提交
6457 6458 6459
	return ret;
}

6460 6461 6462 6463 6464 6465
static int sev_bind_asid(struct kvm *kvm, unsigned int handle, int *error)
{
	struct sev_data_activate *data;
	int asid = sev_get_asid(kvm);
	int ret;

6466
	data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478
	if (!data)
		return -ENOMEM;

	/* activate ASID on the given handle */
	data->handle = handle;
	data->asid   = asid;
	ret = sev_guest_activate(data, error);
	kfree(data);

	return ret;
}

6479
static int __sev_issue_cmd(int fd, int id, void *data, int *error)
6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493
{
	struct fd f;
	int ret;

	f = fdget(fd);
	if (!f.file)
		return -EBADF;

	ret = sev_issue_cmd_external_user(f.file, id, data, error);

	fdput(f);
	return ret;
}

6494 6495
static int sev_issue_cmd(struct kvm *kvm, int id, void *data, int *error)
{
6496
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
6497 6498 6499 6500

	return __sev_issue_cmd(sev->fd, id, data, error);
}

6501 6502
static int sev_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
6503
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515
	struct sev_data_launch_start *start;
	struct kvm_sev_launch_start params;
	void *dh_blob, *session_blob;
	int *error = &argp->error;
	int ret;

	if (!sev_guest(kvm))
		return -ENOTTY;

	if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
		return -EFAULT;

6516
	start = kzalloc(sizeof(*start), GFP_KERNEL_ACCOUNT);
6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547
	if (!start)
		return -ENOMEM;

	dh_blob = NULL;
	if (params.dh_uaddr) {
		dh_blob = psp_copy_user_blob(params.dh_uaddr, params.dh_len);
		if (IS_ERR(dh_blob)) {
			ret = PTR_ERR(dh_blob);
			goto e_free;
		}

		start->dh_cert_address = __sme_set(__pa(dh_blob));
		start->dh_cert_len = params.dh_len;
	}

	session_blob = NULL;
	if (params.session_uaddr) {
		session_blob = psp_copy_user_blob(params.session_uaddr, params.session_len);
		if (IS_ERR(session_blob)) {
			ret = PTR_ERR(session_blob);
			goto e_free_dh;
		}

		start->session_address = __sme_set(__pa(session_blob));
		start->session_len = params.session_len;
	}

	start->handle = params.handle;
	start->policy = params.policy;

	/* create memory encryption context */
6548
	ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_LAUNCH_START, start, error);
6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576
	if (ret)
		goto e_free_session;

	/* Bind ASID to this guest */
	ret = sev_bind_asid(kvm, start->handle, error);
	if (ret)
		goto e_free_session;

	/* return handle to userspace */
	params.handle = start->handle;
	if (copy_to_user((void __user *)(uintptr_t)argp->data, &params, sizeof(params))) {
		sev_unbind_asid(kvm, start->handle);
		ret = -EFAULT;
		goto e_free_session;
	}

	sev->handle = start->handle;
	sev->fd = argp->sev_fd;

e_free_session:
	kfree(session_blob);
e_free_dh:
	kfree(dh_blob);
e_free:
	kfree(start);
	return ret;
}

6577 6578
static unsigned long get_num_contig_pages(unsigned long idx,
				struct page **inpages, unsigned long npages)
6579 6580
{
	unsigned long paddr, next_paddr;
6581
	unsigned long i = idx + 1, pages = 1;
6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599

	/* find the number of contiguous pages starting from idx */
	paddr = __sme_page_pa(inpages[idx]);
	while (i < npages) {
		next_paddr = __sme_page_pa(inpages[i++]);
		if ((paddr + PAGE_SIZE) == next_paddr) {
			pages++;
			paddr = next_paddr;
			continue;
		}
		break;
	}

	return pages;
}

static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
6600
	unsigned long vaddr, vaddr_end, next_vaddr, npages, pages, size, i;
6601
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
6602 6603 6604
	struct kvm_sev_launch_update_data params;
	struct sev_data_launch_update_data *data;
	struct page **inpages;
6605
	int ret;
6606 6607 6608 6609 6610 6611 6612

	if (!sev_guest(kvm))
		return -ENOTTY;

	if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
		return -EFAULT;

6613
	data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627 6628 6629 6630 6631 6632 6633 6634 6635 6636 6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673
	if (!data)
		return -ENOMEM;

	vaddr = params.uaddr;
	size = params.len;
	vaddr_end = vaddr + size;

	/* Lock the user memory. */
	inpages = sev_pin_memory(kvm, vaddr, size, &npages, 1);
	if (!inpages) {
		ret = -ENOMEM;
		goto e_free;
	}

	/*
	 * The LAUNCH_UPDATE command will perform in-place encryption of the
	 * memory content (i.e it will write the same memory region with C=1).
	 * It's possible that the cache may contain the data with C=0, i.e.,
	 * unencrypted so invalidate it first.
	 */
	sev_clflush_pages(inpages, npages);

	for (i = 0; vaddr < vaddr_end; vaddr = next_vaddr, i += pages) {
		int offset, len;

		/*
		 * If the user buffer is not page-aligned, calculate the offset
		 * within the page.
		 */
		offset = vaddr & (PAGE_SIZE - 1);

		/* Calculate the number of pages that can be encrypted in one go. */
		pages = get_num_contig_pages(i, inpages, npages);

		len = min_t(size_t, ((pages * PAGE_SIZE) - offset), size);

		data->handle = sev->handle;
		data->len = len;
		data->address = __sme_page_pa(inpages[i]) + offset;
		ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_DATA, data, &argp->error);
		if (ret)
			goto e_unpin;

		size -= len;
		next_vaddr = vaddr + len;
	}

e_unpin:
	/* content of memory is updated, mark pages dirty */
	for (i = 0; i < npages; i++) {
		set_page_dirty_lock(inpages[i]);
		mark_page_accessed(inpages[i]);
	}
	/* unlock the user pages */
	sev_unpin_memory(kvm, inpages, npages);
e_free:
	kfree(data);
	return ret;
}

6674 6675
static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
6676
	void __user *measure = (void __user *)(uintptr_t)argp->data;
6677
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
6678 6679
	struct sev_data_launch_measure *data;
	struct kvm_sev_launch_measure params;
6680
	void __user *p = NULL;
6681 6682 6683 6684 6685 6686
	void *blob = NULL;
	int ret;

	if (!sev_guest(kvm))
		return -ENOTTY;

6687
	if (copy_from_user(&params, measure, sizeof(params)))
6688 6689
		return -EFAULT;

6690
	data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
6691 6692 6693 6694 6695 6696 6697
	if (!data)
		return -ENOMEM;

	/* User wants to query the blob length */
	if (!params.len)
		goto cmd;

6698 6699
	p = (void __user *)(uintptr_t)params.uaddr;
	if (p) {
6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727
		if (params.len > SEV_FW_BLOB_MAX_SIZE) {
			ret = -EINVAL;
			goto e_free;
		}

		ret = -ENOMEM;
		blob = kmalloc(params.len, GFP_KERNEL);
		if (!blob)
			goto e_free;

		data->address = __psp_pa(blob);
		data->len = params.len;
	}

cmd:
	data->handle = sev->handle;
	ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, data, &argp->error);

	/*
	 * If we query the session length, FW responded with expected data.
	 */
	if (!params.len)
		goto done;

	if (ret)
		goto e_free_blob;

	if (blob) {
6728
		if (copy_to_user(p, blob, params.len))
6729 6730 6731 6732 6733
			ret = -EFAULT;
	}

done:
	params.len = data->len;
6734
	if (copy_to_user(measure, &params, sizeof(params)))
6735 6736 6737 6738 6739 6740 6741 6742
		ret = -EFAULT;
e_free_blob:
	kfree(blob);
e_free:
	kfree(data);
	return ret;
}

6743 6744
static int sev_launch_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
6745
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
6746 6747 6748 6749 6750 6751
	struct sev_data_launch_finish *data;
	int ret;

	if (!sev_guest(kvm))
		return -ENOTTY;

6752
	data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
6753 6754 6755 6756 6757 6758 6759 6760 6761 6762
	if (!data)
		return -ENOMEM;

	data->handle = sev->handle;
	ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_FINISH, data, &argp->error);

	kfree(data);
	return ret;
}

6763 6764
static int sev_guest_status(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
6765
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
6766 6767 6768 6769 6770 6771 6772
	struct kvm_sev_guest_status params;
	struct sev_data_guest_status *data;
	int ret;

	if (!sev_guest(kvm))
		return -ENOTTY;

6773
	data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792
	if (!data)
		return -ENOMEM;

	data->handle = sev->handle;
	ret = sev_issue_cmd(kvm, SEV_CMD_GUEST_STATUS, data, &argp->error);
	if (ret)
		goto e_free;

	params.policy = data->policy;
	params.state = data->state;
	params.handle = data->handle;

	if (copy_to_user((void __user *)(uintptr_t)argp->data, &params, sizeof(params)))
		ret = -EFAULT;
e_free:
	kfree(data);
	return ret;
}

6793 6794 6795 6796
static int __sev_issue_dbg_cmd(struct kvm *kvm, unsigned long src,
			       unsigned long dst, int size,
			       int *error, bool enc)
{
6797
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
6798 6799 6800
	struct sev_data_dbg *data;
	int ret;

6801
	data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
6802 6803 6804 6805 6806 6807 6808 6809 6810 6811 6812 6813 6814 6815 6816 6817 6818 6819 6820 6821 6822 6823 6824 6825 6826 6827 6828 6829 6830 6831 6832 6833 6834 6835 6836 6837 6838 6839 6840 6841 6842 6843 6844 6845 6846 6847 6848 6849 6850 6851 6852 6853 6854 6855 6856 6857 6858 6859 6860 6861 6862 6863 6864 6865 6866 6867 6868 6869
	if (!data)
		return -ENOMEM;

	data->handle = sev->handle;
	data->dst_addr = dst;
	data->src_addr = src;
	data->len = size;

	ret = sev_issue_cmd(kvm,
			    enc ? SEV_CMD_DBG_ENCRYPT : SEV_CMD_DBG_DECRYPT,
			    data, error);
	kfree(data);
	return ret;
}

static int __sev_dbg_decrypt(struct kvm *kvm, unsigned long src_paddr,
			     unsigned long dst_paddr, int sz, int *err)
{
	int offset;

	/*
	 * Its safe to read more than we are asked, caller should ensure that
	 * destination has enough space.
	 */
	src_paddr = round_down(src_paddr, 16);
	offset = src_paddr & 15;
	sz = round_up(sz + offset, 16);

	return __sev_issue_dbg_cmd(kvm, src_paddr, dst_paddr, sz, err, false);
}

static int __sev_dbg_decrypt_user(struct kvm *kvm, unsigned long paddr,
				  unsigned long __user dst_uaddr,
				  unsigned long dst_paddr,
				  int size, int *err)
{
	struct page *tpage = NULL;
	int ret, offset;

	/* if inputs are not 16-byte then use intermediate buffer */
	if (!IS_ALIGNED(dst_paddr, 16) ||
	    !IS_ALIGNED(paddr,     16) ||
	    !IS_ALIGNED(size,      16)) {
		tpage = (void *)alloc_page(GFP_KERNEL);
		if (!tpage)
			return -ENOMEM;

		dst_paddr = __sme_page_pa(tpage);
	}

	ret = __sev_dbg_decrypt(kvm, paddr, dst_paddr, size, err);
	if (ret)
		goto e_free;

	if (tpage) {
		offset = paddr & 15;
		if (copy_to_user((void __user *)(uintptr_t)dst_uaddr,
				 page_address(tpage) + offset, size))
			ret = -EFAULT;
	}

e_free:
	if (tpage)
		__free_page(tpage);

	return ret;
}

6870 6871 6872 6873 6874 6875 6876 6877 6878 6879 6880 6881 6882 6883 6884 6885 6886 6887 6888 6889 6890 6891 6892 6893 6894 6895 6896 6897 6898 6899 6900 6901 6902 6903 6904 6905 6906 6907 6908 6909 6910 6911 6912 6913 6914 6915 6916 6917 6918 6919 6920 6921 6922 6923 6924 6925 6926 6927 6928 6929 6930 6931 6932 6933 6934 6935 6936 6937 6938 6939 6940 6941 6942 6943 6944 6945 6946
static int __sev_dbg_encrypt_user(struct kvm *kvm, unsigned long paddr,
				  unsigned long __user vaddr,
				  unsigned long dst_paddr,
				  unsigned long __user dst_vaddr,
				  int size, int *error)
{
	struct page *src_tpage = NULL;
	struct page *dst_tpage = NULL;
	int ret, len = size;

	/* If source buffer is not aligned then use an intermediate buffer */
	if (!IS_ALIGNED(vaddr, 16)) {
		src_tpage = alloc_page(GFP_KERNEL);
		if (!src_tpage)
			return -ENOMEM;

		if (copy_from_user(page_address(src_tpage),
				(void __user *)(uintptr_t)vaddr, size)) {
			__free_page(src_tpage);
			return -EFAULT;
		}

		paddr = __sme_page_pa(src_tpage);
	}

	/*
	 *  If destination buffer or length is not aligned then do read-modify-write:
	 *   - decrypt destination in an intermediate buffer
	 *   - copy the source buffer in an intermediate buffer
	 *   - use the intermediate buffer as source buffer
	 */
	if (!IS_ALIGNED(dst_vaddr, 16) || !IS_ALIGNED(size, 16)) {
		int dst_offset;

		dst_tpage = alloc_page(GFP_KERNEL);
		if (!dst_tpage) {
			ret = -ENOMEM;
			goto e_free;
		}

		ret = __sev_dbg_decrypt(kvm, dst_paddr,
					__sme_page_pa(dst_tpage), size, error);
		if (ret)
			goto e_free;

		/*
		 *  If source is kernel buffer then use memcpy() otherwise
		 *  copy_from_user().
		 */
		dst_offset = dst_paddr & 15;

		if (src_tpage)
			memcpy(page_address(dst_tpage) + dst_offset,
			       page_address(src_tpage), size);
		else {
			if (copy_from_user(page_address(dst_tpage) + dst_offset,
					   (void __user *)(uintptr_t)vaddr, size)) {
				ret = -EFAULT;
				goto e_free;
			}
		}

		paddr = __sme_page_pa(dst_tpage);
		dst_paddr = round_down(dst_paddr, 16);
		len = round_up(size, 16);
	}

	ret = __sev_issue_dbg_cmd(kvm, paddr, dst_paddr, len, error, true);

e_free:
	if (src_tpage)
		__free_page(src_tpage);
	if (dst_tpage)
		__free_page(dst_tpage);
	return ret;
}

6947 6948 6949
static int sev_dbg_crypt(struct kvm *kvm, struct kvm_sev_cmd *argp, bool dec)
{
	unsigned long vaddr, vaddr_end, next_vaddr;
6950
	unsigned long dst_vaddr;
6951 6952 6953
	struct page **src_p, **dst_p;
	struct kvm_sev_dbg debug;
	unsigned long n;
6954 6955
	unsigned int size;
	int ret;
6956 6957 6958 6959 6960 6961 6962

	if (!sev_guest(kvm))
		return -ENOTTY;

	if (copy_from_user(&debug, (void __user *)(uintptr_t)argp->data, sizeof(debug)))
		return -EFAULT;

6963 6964 6965 6966 6967
	if (!debug.len || debug.src_uaddr + debug.len < debug.src_uaddr)
		return -EINVAL;
	if (!debug.dst_uaddr)
		return -EINVAL;

6968 6969 6970 6971 6972 6973 6974 6975 6976 6977 6978 6979 6980 6981 6982 6983 6984 6985 6986 6987 6988 6989 6990 6991 6992 6993 6994 6995 6996 6997 6998 6999 7000 7001 7002 7003
	vaddr = debug.src_uaddr;
	size = debug.len;
	vaddr_end = vaddr + size;
	dst_vaddr = debug.dst_uaddr;

	for (; vaddr < vaddr_end; vaddr = next_vaddr) {
		int len, s_off, d_off;

		/* lock userspace source and destination page */
		src_p = sev_pin_memory(kvm, vaddr & PAGE_MASK, PAGE_SIZE, &n, 0);
		if (!src_p)
			return -EFAULT;

		dst_p = sev_pin_memory(kvm, dst_vaddr & PAGE_MASK, PAGE_SIZE, &n, 1);
		if (!dst_p) {
			sev_unpin_memory(kvm, src_p, n);
			return -EFAULT;
		}

		/*
		 * The DBG_{DE,EN}CRYPT commands will perform {dec,en}cryption of the
		 * memory content (i.e it will write the same memory region with C=1).
		 * It's possible that the cache may contain the data with C=0, i.e.,
		 * unencrypted so invalidate it first.
		 */
		sev_clflush_pages(src_p, 1);
		sev_clflush_pages(dst_p, 1);

		/*
		 * Since user buffer may not be page aligned, calculate the
		 * offset within the page.
		 */
		s_off = vaddr & ~PAGE_MASK;
		d_off = dst_vaddr & ~PAGE_MASK;
		len = min_t(size_t, (PAGE_SIZE - s_off), size);

7004 7005 7006 7007 7008 7009 7010 7011 7012 7013 7014 7015 7016
		if (dec)
			ret = __sev_dbg_decrypt_user(kvm,
						     __sme_page_pa(src_p[0]) + s_off,
						     dst_vaddr,
						     __sme_page_pa(dst_p[0]) + d_off,
						     len, &argp->error);
		else
			ret = __sev_dbg_encrypt_user(kvm,
						     __sme_page_pa(src_p[0]) + s_off,
						     vaddr,
						     __sme_page_pa(dst_p[0]) + d_off,
						     dst_vaddr,
						     len, &argp->error);
7017

7018 7019
		sev_unpin_memory(kvm, src_p, n);
		sev_unpin_memory(kvm, dst_p, n);
7020 7021 7022 7023 7024 7025 7026 7027 7028 7029 7030 7031

		if (ret)
			goto err;

		next_vaddr = vaddr + len;
		dst_vaddr = dst_vaddr + len;
		size -= len;
	}
err:
	return ret;
}

7032 7033
static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
7034
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
7035 7036 7037 7038 7039
	struct sev_data_launch_secret *data;
	struct kvm_sev_launch_secret params;
	struct page **pages;
	void *blob, *hdr;
	unsigned long n;
7040
	int ret, offset;
7041 7042 7043 7044 7045 7046 7047 7048 7049 7050 7051 7052 7053 7054 7055 7056 7057 7058 7059 7060 7061

	if (!sev_guest(kvm))
		return -ENOTTY;

	if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
		return -EFAULT;

	pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, 1);
	if (!pages)
		return -ENOMEM;

	/*
	 * The secret must be copied into contiguous memory region, lets verify
	 * that userspace memory pages are contiguous before we issue command.
	 */
	if (get_num_contig_pages(0, pages, n) != n) {
		ret = -EINVAL;
		goto e_unpin_memory;
	}

	ret = -ENOMEM;
7062
	data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
7063 7064 7065
	if (!data)
		goto e_unpin_memory;

7066 7067 7068 7069
	offset = params.guest_uaddr & (PAGE_SIZE - 1);
	data->guest_address = __sme_page_pa(pages[0]) + offset;
	data->guest_len = params.guest_len;

7070 7071 7072 7073 7074 7075 7076 7077 7078 7079 7080 7081 7082 7083
	blob = psp_copy_user_blob(params.trans_uaddr, params.trans_len);
	if (IS_ERR(blob)) {
		ret = PTR_ERR(blob);
		goto e_free;
	}

	data->trans_address = __psp_pa(blob);
	data->trans_len = params.trans_len;

	hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len);
	if (IS_ERR(hdr)) {
		ret = PTR_ERR(hdr);
		goto e_free_blob;
	}
7084 7085
	data->hdr_address = __psp_pa(hdr);
	data->hdr_len = params.hdr_len;
7086 7087 7088 7089 7090 7091 7092 7093 7094 7095 7096 7097 7098 7099 7100

	data->handle = sev->handle;
	ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_SECRET, data, &argp->error);

	kfree(hdr);

e_free_blob:
	kfree(blob);
e_free:
	kfree(data);
e_unpin_memory:
	sev_unpin_memory(kvm, pages, n);
	return ret;
}

B
Brijesh Singh 已提交
7101 7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7112 7113 7114 7115 7116 7117
static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
{
	struct kvm_sev_cmd sev_cmd;
	int r;

	if (!svm_sev_enabled())
		return -ENOTTY;

	if (copy_from_user(&sev_cmd, argp, sizeof(struct kvm_sev_cmd)))
		return -EFAULT;

	mutex_lock(&kvm->lock);

	switch (sev_cmd.id) {
	case KVM_SEV_INIT:
		r = sev_guest_init(kvm, &sev_cmd);
		break;
7118 7119 7120
	case KVM_SEV_LAUNCH_START:
		r = sev_launch_start(kvm, &sev_cmd);
		break;
7121 7122 7123
	case KVM_SEV_LAUNCH_UPDATE_DATA:
		r = sev_launch_update_data(kvm, &sev_cmd);
		break;
7124 7125 7126
	case KVM_SEV_LAUNCH_MEASURE:
		r = sev_launch_measure(kvm, &sev_cmd);
		break;
7127 7128 7129
	case KVM_SEV_LAUNCH_FINISH:
		r = sev_launch_finish(kvm, &sev_cmd);
		break;
7130 7131 7132
	case KVM_SEV_GUEST_STATUS:
		r = sev_guest_status(kvm, &sev_cmd);
		break;
7133 7134 7135
	case KVM_SEV_DBG_DECRYPT:
		r = sev_dbg_crypt(kvm, &sev_cmd, true);
		break;
7136 7137 7138
	case KVM_SEV_DBG_ENCRYPT:
		r = sev_dbg_crypt(kvm, &sev_cmd, false);
		break;
7139 7140 7141
	case KVM_SEV_LAUNCH_SECRET:
		r = sev_launch_secret(kvm, &sev_cmd);
		break;
B
Brijesh Singh 已提交
7142 7143 7144 7145 7146 7147 7148 7149 7150 7151 7152 7153 7154
	default:
		r = -EINVAL;
		goto out;
	}

	if (copy_to_user(argp, &sev_cmd, sizeof(struct kvm_sev_cmd)))
		r = -EFAULT;

out:
	mutex_unlock(&kvm->lock);
	return r;
}

7155 7156 7157
static int svm_register_enc_region(struct kvm *kvm,
				   struct kvm_enc_region *range)
{
7158
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
7159 7160 7161 7162 7163 7164
	struct enc_region *region;
	int ret = 0;

	if (!sev_guest(kvm))
		return -ENOTTY;

7165 7166 7167
	if (range->addr > ULONG_MAX || range->size > ULONG_MAX)
		return -EINVAL;

7168
	region = kzalloc(sizeof(*region), GFP_KERNEL_ACCOUNT);
7169 7170 7171 7172 7173 7174 7175 7176 7177 7178 7179 7180 7181 7182 7183 7184 7185 7186 7187 7188 7189 7190 7191 7192 7193 7194 7195 7196 7197 7198 7199 7200 7201 7202
	if (!region)
		return -ENOMEM;

	region->pages = sev_pin_memory(kvm, range->addr, range->size, &region->npages, 1);
	if (!region->pages) {
		ret = -ENOMEM;
		goto e_free;
	}

	/*
	 * The guest may change the memory encryption attribute from C=0 -> C=1
	 * or vice versa for this memory range. Lets make sure caches are
	 * flushed to ensure that guest data gets written into memory with
	 * correct C-bit.
	 */
	sev_clflush_pages(region->pages, region->npages);

	region->uaddr = range->addr;
	region->size = range->size;

	mutex_lock(&kvm->lock);
	list_add_tail(&region->list, &sev->regions_list);
	mutex_unlock(&kvm->lock);

	return ret;

e_free:
	kfree(region);
	return ret;
}

static struct enc_region *
find_enc_region(struct kvm *kvm, struct kvm_enc_region *range)
{
7203
	struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
7204 7205 7206 7207 7208 7209 7210 7211 7212 7213 7214 7215 7216 7217 7218 7219 7220 7221 7222 7223 7224 7225 7226 7227 7228 7229 7230 7231 7232 7233 7234 7235 7236 7237 7238 7239 7240 7241 7242 7243 7244 7245
	struct list_head *head = &sev->regions_list;
	struct enc_region *i;

	list_for_each_entry(i, head, list) {
		if (i->uaddr == range->addr &&
		    i->size == range->size)
			return i;
	}

	return NULL;
}


static int svm_unregister_enc_region(struct kvm *kvm,
				     struct kvm_enc_region *range)
{
	struct enc_region *region;
	int ret;

	mutex_lock(&kvm->lock);

	if (!sev_guest(kvm)) {
		ret = -ENOTTY;
		goto failed;
	}

	region = find_enc_region(kvm, range);
	if (!region) {
		ret = -EINVAL;
		goto failed;
	}

	__unregister_enc_region_locked(kvm, region);

	mutex_unlock(&kvm->lock);
	return 0;

failed:
	mutex_unlock(&kvm->lock);
	return ret;
}

7246 7247
static bool svm_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
{
7248 7249 7250 7251
	unsigned long cr4 = kvm_read_cr4(vcpu);
	bool smep = cr4 & X86_CR4_SMEP;
	bool smap = cr4 & X86_CR4_SMAP;
	bool is_user = svm_get_cpl(vcpu) == 3;
7252 7253

	/*
7254 7255 7256 7257 7258 7259 7260 7261 7262 7263 7264 7265 7266 7267 7268 7269 7270 7271 7272 7273 7274 7275 7276 7277 7278 7279 7280 7281 7282
	 * Detect and workaround Errata 1096 Fam_17h_00_0Fh.
	 *
	 * Errata:
	 * When CPU raise #NPF on guest data access and vCPU CR4.SMAP=1, it is
	 * possible that CPU microcode implementing DecodeAssist will fail
	 * to read bytes of instruction which caused #NPF. In this case,
	 * GuestIntrBytes field of the VMCB on a VMEXIT will incorrectly
	 * return 0 instead of the correct guest instruction bytes.
	 *
	 * This happens because CPU microcode reading instruction bytes
	 * uses a special opcode which attempts to read data using CPL=0
	 * priviledges. The microcode reads CS:RIP and if it hits a SMAP
	 * fault, it gives up and returns no instruction bytes.
	 *
	 * Detection:
	 * We reach here in case CPU supports DecodeAssist, raised #NPF and
	 * returned 0 in GuestIntrBytes field of the VMCB.
	 * First, errata can only be triggered in case vCPU CR4.SMAP=1.
	 * Second, if vCPU CR4.SMEP=1, errata could only be triggered
	 * in case vCPU CPL==3 (Because otherwise guest would have triggered
	 * a SMEP fault instead of #NPF).
	 * Otherwise, vCPU CR4.SMEP=0, errata could be triggered by any vCPU CPL.
	 * As most guests enable SMAP if they have also enabled SMEP, use above
	 * logic in order to attempt minimize false-positive of detecting errata
	 * while still preserving all cases semantic correctness.
	 *
	 * Workaround:
	 * To determine what instruction the guest was executing, the hypervisor
	 * will have to decode the instruction at the instruction pointer.
7283 7284 7285 7286 7287 7288 7289 7290 7291 7292
	 *
	 * In non SEV guest, hypervisor will be able to read the guest
	 * memory to decode the instruction pointer when insn_len is zero
	 * so we return true to indicate that decoding is possible.
	 *
	 * But in the SEV guest, the guest memory is encrypted with the
	 * guest specific key and hypervisor will not be able to decode the
	 * instruction pointer so we will not able to workaround it. Lets
	 * print the error and request to kill the guest.
	 */
7293
	if (smap && (!smep || is_user)) {
7294 7295 7296
		if (!sev_guest(vcpu->kvm))
			return true;

7297
		pr_err_ratelimited("KVM: SEV Guest triggered AMD Erratum 1096\n");
7298 7299 7300 7301 7302 7303
		kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
	}

	return false;
}

7304 7305 7306 7307 7308 7309 7310 7311 7312 7313 7314 7315 7316 7317 7318
static bool svm_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	/*
	 * TODO: Last condition latch INIT signals on vCPU when
	 * vCPU is in guest-mode and vmcb12 defines intercept on INIT.
	 * To properly emulate the INIT intercept, SVM should implement
	 * kvm_x86_ops->check_nested_events() and call nested_svm_vmexit()
	 * there if an INIT signal is pending.
	 */
	return !gif_set(svm) ||
		   (svm->vmcb->control.intercept & (1ULL << INTERCEPT_INIT));
}

7319 7320
static bool svm_check_apicv_inhibit_reasons(ulong bit)
{
7321 7322
	ulong supported = BIT(APICV_INHIBIT_REASON_DISABLE) |
			  BIT(APICV_INHIBIT_REASON_HYPERV);
7323 7324 7325 7326

	return supported & BIT(bit);
}

7327 7328 7329 7330 7331
static void svm_pre_update_apicv_exec_ctrl(struct kvm *kvm, bool activate)
{
	avic_update_access_page(kvm, activate);
}

7332
static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
A
Avi Kivity 已提交
7333 7334 7335 7336
	.cpu_has_kvm_support = has_svm,
	.disabled_by_bios = is_disabled,
	.hardware_setup = svm_hardware_setup,
	.hardware_unsetup = svm_hardware_unsetup,
Y
Yang, Sheng 已提交
7337
	.check_processor_compatibility = svm_check_processor_compat,
A
Avi Kivity 已提交
7338 7339
	.hardware_enable = svm_hardware_enable,
	.hardware_disable = svm_hardware_disable,
7340
	.cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
7341
	.has_emulated_msr = svm_has_emulated_msr,
A
Avi Kivity 已提交
7342 7343 7344

	.vcpu_create = svm_create_vcpu,
	.vcpu_free = svm_free_vcpu,
7345
	.vcpu_reset = svm_vcpu_reset,
A
Avi Kivity 已提交
7346

7347 7348
	.vm_alloc = svm_vm_alloc,
	.vm_free = svm_vm_free,
7349
	.vm_init = svm_vm_init,
B
Brijesh Singh 已提交
7350
	.vm_destroy = svm_vm_destroy,
7351

7352
	.prepare_guest_switch = svm_prepare_guest_switch,
A
Avi Kivity 已提交
7353 7354
	.vcpu_load = svm_vcpu_load,
	.vcpu_put = svm_vcpu_put,
7355 7356
	.vcpu_blocking = svm_vcpu_blocking,
	.vcpu_unblocking = svm_vcpu_unblocking,
A
Avi Kivity 已提交
7357

7358
	.update_bp_intercept = update_bp_intercept,
7359
	.get_msr_feature = svm_get_msr_feature,
A
Avi Kivity 已提交
7360 7361 7362 7363 7364
	.get_msr = svm_get_msr,
	.set_msr = svm_set_msr,
	.get_segment_base = svm_get_segment_base,
	.get_segment = svm_get_segment,
	.set_segment = svm_set_segment,
7365
	.get_cpl = svm_get_cpl,
7366
	.get_cs_db_l_bits = kvm_get_cs_db_l_bits,
7367
	.decache_cr0_guest_bits = svm_decache_cr0_guest_bits,
7368
	.decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
A
Avi Kivity 已提交
7369 7370 7371 7372 7373 7374 7375 7376
	.set_cr0 = svm_set_cr0,
	.set_cr3 = svm_set_cr3,
	.set_cr4 = svm_set_cr4,
	.set_efer = svm_set_efer,
	.get_idt = svm_get_idt,
	.set_idt = svm_set_idt,
	.get_gdt = svm_get_gdt,
	.set_gdt = svm_set_gdt,
J
Jan Kiszka 已提交
7377 7378
	.get_dr6 = svm_get_dr6,
	.set_dr6 = svm_set_dr6,
7379
	.set_dr7 = svm_set_dr7,
7380
	.sync_dirty_debug_regs = svm_sync_dirty_debug_regs,
A
Avi Kivity 已提交
7381
	.cache_reg = svm_cache_reg,
A
Avi Kivity 已提交
7382 7383
	.get_rflags = svm_get_rflags,
	.set_rflags = svm_set_rflags,
7384

A
Avi Kivity 已提交
7385
	.tlb_flush = svm_flush_tlb,
7386
	.tlb_flush_gva = svm_flush_tlb_gva,
A
Avi Kivity 已提交
7387 7388

	.run = svm_vcpu_run,
7389
	.handle_exit = handle_exit,
A
Avi Kivity 已提交
7390
	.skip_emulated_instruction = skip_emulated_instruction,
7391 7392
	.set_interrupt_shadow = svm_set_interrupt_shadow,
	.get_interrupt_shadow = svm_get_interrupt_shadow,
I
Ingo Molnar 已提交
7393
	.patch_hypercall = svm_patch_hypercall,
E
Eddie Dong 已提交
7394
	.set_irq = svm_set_irq,
7395
	.set_nmi = svm_inject_nmi,
7396
	.queue_exception = svm_queue_exception,
A
Avi Kivity 已提交
7397
	.cancel_injection = svm_cancel_injection,
7398
	.interrupt_allowed = svm_interrupt_allowed,
7399
	.nmi_allowed = svm_nmi_allowed,
J
Jan Kiszka 已提交
7400 7401
	.get_nmi_mask = svm_get_nmi_mask,
	.set_nmi_mask = svm_set_nmi_mask,
7402 7403 7404
	.enable_nmi_window = enable_nmi_window,
	.enable_irq_window = enable_irq_window,
	.update_cr8_intercept = update_cr8_intercept,
7405
	.set_virtual_apic_mode = svm_set_virtual_apic_mode,
7406
	.refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl,
7407
	.check_apicv_inhibit_reasons = svm_check_apicv_inhibit_reasons,
7408
	.pre_update_apicv_exec_ctrl = svm_pre_update_apicv_exec_ctrl,
7409
	.load_eoi_exitmap = svm_load_eoi_exitmap,
7410 7411
	.hwapic_irr_update = svm_hwapic_irr_update,
	.hwapic_isr_update = svm_hwapic_isr_update,
7412
	.sync_pir_to_irr = kvm_lapic_find_highest_irr,
7413
	.apicv_post_state_restore = avic_post_state_restore,
7414 7415

	.set_tss_addr = svm_set_tss_addr,
7416
	.set_identity_map_addr = svm_set_identity_map_addr,
7417
	.get_tdp_level = get_npt_level,
7418
	.get_mt_mask = svm_get_mt_mask,
7419

7420 7421
	.get_exit_info = svm_get_exit_info,

7422
	.get_lpage_level = svm_get_lpage_level,
7423 7424

	.cpuid_update = svm_cpuid_update,
7425 7426

	.rdtscp_supported = svm_rdtscp_supported,
7427
	.invpcid_supported = svm_invpcid_supported,
7428
	.mpx_supported = svm_mpx_supported,
7429
	.xsaves_supported = svm_xsaves_supported,
7430
	.umip_emulated = svm_umip_emulated,
7431
	.pt_supported = svm_pt_supported,
7432
	.pku_supported = svm_pku_supported,
7433 7434

	.set_supported_cpuid = svm_set_supported_cpuid,
7435 7436

	.has_wbinvd_exit = svm_has_wbinvd_exit,
7437

7438
	.read_l1_tsc_offset = svm_read_l1_tsc_offset,
7439
	.write_l1_tsc_offset = svm_write_l1_tsc_offset,
7440 7441

	.set_tdp_cr3 = set_tdp_cr3,
7442 7443

	.check_intercept = svm_check_intercept,
7444
	.handle_exit_irqoff = svm_handle_exit_irqoff,
7445

7446 7447
	.request_immediate_exit = __kvm_request_immediate_exit,

7448
	.sched_in = svm_sched_in,
7449 7450

	.pmu_ops = &amd_pmu_ops,
7451
	.deliver_posted_interrupt = svm_deliver_avic_intr,
7452
	.dy_apicv_has_pending_interrupt = svm_dy_apicv_has_pending_interrupt,
7453
	.update_pi_irte = svm_update_pi_irte,
7454
	.setup_mce = svm_setup_mce,
7455

7456
	.smi_allowed = svm_smi_allowed,
7457 7458
	.pre_enter_smm = svm_pre_enter_smm,
	.pre_leave_smm = svm_pre_leave_smm,
7459
	.enable_smi_window = enable_smi_window,
B
Brijesh Singh 已提交
7460 7461

	.mem_enc_op = svm_mem_enc_op,
7462 7463
	.mem_enc_reg_region = svm_register_enc_region,
	.mem_enc_unreg_region = svm_unregister_enc_region,
7464

7465
	.nested_enable_evmcs = NULL,
7466
	.nested_get_evmcs_version = NULL,
7467 7468

	.need_emulation_on_page_fault = svm_need_emulation_on_page_fault,
7469 7470

	.apic_init_signal_blocked = svm_apic_init_signal_blocked,
A
Avi Kivity 已提交
7471 7472 7473 7474
};

static int __init svm_init(void)
{
7475
	return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
7476
			__alignof__(struct vcpu_svm), THIS_MODULE);
A
Avi Kivity 已提交
7477 7478 7479 7480
}

static void __exit svm_exit(void)
{
7481
	kvm_exit();
A
Avi Kivity 已提交
7482 7483 7484 7485
}

module_init(svm_init)
module_exit(svm_exit)