svm.c 174.6 KB
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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>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */
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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 <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/microcode.h>
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#include <asm/nospec-branch.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_NPT            (1 <<  0)
#define SVM_FEATURE_LBRV           (1 <<  1)
#define SVM_FEATURE_SVML           (1 <<  2)
#define SVM_FEATURE_NRIP           (1 <<  3)
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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)

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 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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	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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	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)
#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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/* 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 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 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 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 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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#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 bool svm_sev_enabled(void)
{
	return max_sev_asid;
}

static inline bool sev_guest(struct kvm *kvm)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;

	return sev->active;
}
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static inline int sev_get_asid(struct kvm *kvm)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;

	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)
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{
	struct vmcb *vmcb = get_host_vmcb(svm);

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	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);
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	recalc_intercepts(svm);
}

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static inline void clr_dr_intercepts(struct vcpu_svm *svm)
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{
	struct vmcb *vmcb = get_host_vmcb(svm);

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	vmcb->control.intercept_dr = 0;
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	recalc_intercepts(svm);
}

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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);
}

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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);
}

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

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static inline void enable_gif(struct vcpu_svm *svm)
{
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	if (vgif_enabled(svm))
		svm->vmcb->control.int_ctl |= V_GIF_MASK;
	else
		svm->vcpu.arch.hflags |= HF_GIF_MASK;
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}

static inline void disable_gif(struct vcpu_svm *svm)
{
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	if (vgif_enabled(svm))
		svm->vmcb->control.int_ctl &= ~V_GIF_MASK;
	else
		svm->vcpu.arch.hflags &= ~HF_GIF_MASK;
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}

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

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static unsigned long iopm_base;
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struct kvm_ldttss_desc {
	u16 limit0;
	u16 base0;
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	unsigned base1:8, type:5, dpl:2, p:1;
	unsigned limit1:4, zero0:3, g:1, base2:8;
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	u32 base3;
	u32 zero1;
} __attribute__((packed));

struct svm_cpu_data {
	int cpu;

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	u64 asid_generation;
	u32 max_asid;
	u32 next_asid;
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	u32 min_asid;
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	struct kvm_ldttss_desc *tss_desc;

	struct page *save_area;
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	struct vmcb *current_vmcb;
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	/* index = sev_asid, value = vmcb pointer */
	struct vmcb **sev_vmcbs;
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};

static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);

struct svm_init_data {
	int cpu;
	int r;
};

594
static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
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596
#define NUM_MSR_MAPS ARRAY_SIZE(msrpm_ranges)
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#define MSRS_RANGE_SIZE 2048
#define MSRS_IN_RANGE (MSRS_RANGE_SIZE * 8 / 2)

600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620
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;
}

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#define MAX_INST_SIZE 15

static inline void clgi(void)
{
625
	asm volatile (__ex(SVM_CLGI));
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}

static inline void stgi(void)
{
630
	asm volatile (__ex(SVM_STGI));
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631 632 633 634
}

static inline void invlpga(unsigned long addr, u32 asid)
{
J
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635
	asm volatile (__ex(SVM_INVLPGA) : : "a"(addr), "c"(asid));
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}

638
static int get_npt_level(struct kvm_vcpu *vcpu)
639 640
{
#ifdef CONFIG_X86_64
641
	return PT64_ROOT_4LEVEL;
642 643 644 645 646
#else
	return PT32E_ROOT_LEVEL;
#endif
}

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static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
649
	vcpu->arch.efer = efer;
650
	if (!npt_enabled && !(efer & EFER_LMA))
651
		efer &= ~EFER_LME;
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652

653
	to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
654
	mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
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}

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

663
static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu)
664 665 666 667 668
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 ret = 0;

	if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
669 670
		ret = KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
	return ret;
671 672 673 674 675 676 677 678 679 680 681 682 683
}

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;

}

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static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
{
686 687
	struct vcpu_svm *svm = to_svm(vcpu);

688
	if (svm->vmcb->control.next_rip != 0) {
689
		WARN_ON_ONCE(!static_cpu_has(X86_FEATURE_NRIPS));
690
		svm->next_rip = svm->vmcb->control.next_rip;
691
	}
692

693
	if (!svm->next_rip) {
694
		if (emulate_instruction(vcpu, EMULTYPE_SKIP) !=
695 696
				EMULATE_DONE)
			printk(KERN_DEBUG "%s: NOP\n", __func__);
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		return;
	}
699 700 701
	if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE)
		printk(KERN_ERR "%s: ip 0x%lx next 0x%llx\n",
		       __func__, kvm_rip_read(vcpu), svm->next_rip);
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702

703
	kvm_rip_write(vcpu, svm->next_rip);
704
	svm_set_interrupt_shadow(vcpu, 0);
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}

707
static void svm_queue_exception(struct kvm_vcpu *vcpu)
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{
	struct vcpu_svm *svm = to_svm(vcpu);
710 711
	unsigned nr = vcpu->arch.exception.nr;
	bool has_error_code = vcpu->arch.exception.has_error_code;
712
	bool reinject = vcpu->arch.exception.injected;
713
	u32 error_code = vcpu->arch.exception.error_code;
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	/*
	 * If we are within a nested VM we'd better #VMEXIT and let the guest
	 * handle the exception
	 */
719 720
	if (!reinject &&
	    nested_svm_check_exception(svm, nr, has_error_code, error_code))
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721 722
		return;

723
	if (nr == BP_VECTOR && !static_cpu_has(X86_FEATURE_NRIPS)) {
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738
		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.
		 */
		skip_emulated_instruction(&svm->vcpu);
		rip = kvm_rip_read(&svm->vcpu);
		svm->int3_rip = rip + svm->vmcb->save.cs.base;
		svm->int3_injected = rip - old_rip;
	}

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739 740 741 742 743 744 745
	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;
}

746 747 748 749 750 751
static void svm_init_erratum_383(void)
{
	u32 low, high;
	int err;
	u64 val;

752
	if (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
		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;
}

770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790
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;
}

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static int has_svm(void)
{
793
	const char *msg;
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794

795
	if (!cpu_has_svm(&msg)) {
J
Joe Perches 已提交
796
		printk(KERN_INFO "has_svm: %s\n", msg);
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797 798 799 800 801 802
		return 0;
	}

	return 1;
}

803
static void svm_hardware_disable(void)
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804
{
805 806 807 808
	/* Make sure we clean up behind us */
	if (static_cpu_has(X86_FEATURE_TSCRATEMSR))
		wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);

809
	cpu_svm_disable();
810 811

	amd_pmu_disable_virt();
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}

814
static int svm_hardware_enable(void)
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815 816
{

817
	struct svm_cpu_data *sd;
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	uint64_t efer;
	struct desc_struct *gdt;
	int me = raw_smp_processor_id();

822 823 824 825
	rdmsrl(MSR_EFER, efer);
	if (efer & EFER_SVME)
		return -EBUSY;

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826
	if (!has_svm()) {
827
		pr_err("%s: err EOPNOTSUPP on %d\n", __func__, me);
828
		return -EINVAL;
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829
	}
830 831
	sd = per_cpu(svm_data, me);
	if (!sd) {
832
		pr_err("%s: svm_data is NULL on %d\n", __func__, me);
833
		return -EINVAL;
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834 835
	}

836 837 838
	sd->asid_generation = 1;
	sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
	sd->next_asid = sd->max_asid + 1;
839
	sd->min_asid = max_sev_asid + 1;
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840

841
	gdt = get_current_gdt_rw();
842
	sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
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843

844
	wrmsrl(MSR_EFER, efer | EFER_SVME);
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845

846
	wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);
847

848 849
	if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
		wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
850
		__this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT);
851 852
	}

853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882

	/*
	 * 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;

883 884
	svm_init_erratum_383();

885 886
	amd_pmu_enable_virt();

887
	return 0;
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888 889
}

890 891
static void svm_cpu_uninit(int cpu)
{
892
	struct svm_cpu_data *sd = per_cpu(svm_data, raw_smp_processor_id());
893

894
	if (!sd)
895 896 897
		return;

	per_cpu(svm_data, raw_smp_processor_id()) = NULL;
898
	kfree(sd->sev_vmcbs);
899 900
	__free_page(sd->save_area);
	kfree(sd);
901 902
}

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static int svm_cpu_init(int cpu)
{
905
	struct svm_cpu_data *sd;
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906 907
	int r;

908 909
	sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
	if (!sd)
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910
		return -ENOMEM;
911
	sd->cpu = cpu;
A
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912
	r = -ENOMEM;
913
	sd->save_area = alloc_page(GFP_KERNEL);
914
	if (!sd->save_area)
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915 916
		goto err_1;

917 918 919 920 921 922 923
	if (svm_sev_enabled()) {
		r = -ENOMEM;
		sd->sev_vmcbs = kmalloc((max_sev_asid + 1) * sizeof(void *), GFP_KERNEL);
		if (!sd->sev_vmcbs)
			goto err_1;
	}

924
	per_cpu(svm_data, cpu) = sd;
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Avi Kivity 已提交
925 926 927 928

	return 0;

err_1:
929
	kfree(sd);
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930 931 932 933
	return r;

}

934 935 936 937 938 939 940 941 942 943 944
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;
}

945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
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);
}

964 965
static void set_msr_interception(u32 *msrpm, unsigned msr,
				 int read, int write)
A
Avi Kivity 已提交
966
{
967 968 969
	u8 bit_read, bit_write;
	unsigned long tmp;
	u32 offset;
A
Avi Kivity 已提交
970

971 972 973 974 975 976
	/*
	 * If this warning triggers extend the direct_access_msrs list at the
	 * beginning of the file
	 */
	WARN_ON(!valid_msr_intercept(msr));

977 978 979 980 981 982 983 984 985 986 987
	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;
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Avi Kivity 已提交
988 989
}

990
static void svm_vcpu_init_msrpm(u32 *msrpm)
A
Avi Kivity 已提交
991 992 993
{
	int i;

994 995
	memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));

996 997 998 999 1000 1001
	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);
	}
1002 1003
}

1004 1005 1006 1007 1008 1009 1010 1011
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)
1012
			return;
1013 1014 1015 1016 1017 1018 1019 1020 1021

		/* 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
1022
	}
1023 1024 1025 1026 1027

	/*
	 * If this BUG triggers the msrpm_offsets table has an overflow. Just
	 * increase MSRPM_OFFSETS in this case.
	 */
1028
	BUG();
A
Avi Kivity 已提交
1029 1030
}

1031
static void init_msrpm_offsets(void)
1032
{
1033
	int i;
1034

1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
	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);
	}
1045 1046
}

1047 1048 1049 1050
static void svm_enable_lbrv(struct vcpu_svm *svm)
{
	u32 *msrpm = svm->msrpm;

1051
	svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK;
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061
	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;

1062
	svm->vmcb->control.virt_ext &= ~LBR_CTL_ENABLE_MASK;
1063 1064 1065 1066 1067 1068
	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);
}

1069 1070 1071
static void disable_nmi_singlestep(struct vcpu_svm *svm)
{
	svm->nmi_singlestep = false;
1072

1073 1074 1075 1076 1077 1078 1079
	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;
	}
1080 1081
}

1082 1083 1084 1085 1086 1087
/* Note:
 * This hash table is used to map VM_ID to a struct kvm_arch,
 * when handling AMD IOMMU GALOG notification to schedule in
 * a particular vCPU.
 */
#define SVM_VM_DATA_HASH_BITS	8
1088
static DEFINE_HASHTABLE(svm_vm_data_hash, SVM_VM_DATA_HASH_BITS);
1089 1090
static u32 next_vm_id = 0;
static bool next_vm_id_wrapped = 0;
1091
static DEFINE_SPINLOCK(svm_vm_data_hash_lock);
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123

/* 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;
	struct kvm_arch *ka = NULL;
	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);
	hash_for_each_possible(svm_vm_data_hash, ka, hnode, vm_id) {
		struct kvm *kvm = container_of(ka, struct kvm, arch);
		struct kvm_arch *vm_data = &kvm->arch;

		if (vm_data->avic_vm_id != vm_id)
			continue;
		vcpu = kvm_get_vcpu_by_id(kvm, vcpu_id);
		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.
	 */
1124
	if (vcpu)
1125 1126 1127 1128 1129
		kvm_vcpu_wake_up(vcpu);

	return 0;
}

B
Brijesh Singh 已提交
1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140
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
1141 1142 1143 1144 1145 1146 1147 1148 1149
	/* Minimum ASID value that should be used for SEV guest */
	min_sev_asid = cpuid_edx(0x8000001F);

	/* Initialize SEV ASID bitmap */
	sev_asid_bitmap = kcalloc(BITS_TO_LONGS(max_sev_asid),
				sizeof(unsigned long), GFP_KERNEL);
	if (!sev_asid_bitmap)
		return 1;

B
Brijesh Singh 已提交
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171
	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;
}

A
Avi Kivity 已提交
1172 1173 1174 1175
static __init int svm_hardware_setup(void)
{
	int cpu;
	struct page *iopm_pages;
1176
	void *iopm_va;
A
Avi Kivity 已提交
1177 1178 1179 1180 1181 1182
	int r;

	iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);

	if (!iopm_pages)
		return -ENOMEM;
1183 1184 1185

	iopm_va = page_address(iopm_pages);
	memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
A
Avi Kivity 已提交
1186 1187
	iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;

1188 1189
	init_msrpm_offsets();

1190 1191 1192
	if (boot_cpu_has(X86_FEATURE_NX))
		kvm_enable_efer_bits(EFER_NX);

A
Alexander Graf 已提交
1193 1194 1195
	if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
		kvm_enable_efer_bits(EFER_FFXSR);

1196 1197
	if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
		kvm_has_tsc_control = true;
1198 1199
		kvm_max_tsc_scaling_ratio = TSC_RATIO_MAX;
		kvm_tsc_scaling_ratio_frac_bits = 32;
1200 1201
	}

1202 1203
	if (nested) {
		printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
1204
		kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
1205 1206
	}

B
Brijesh Singh 已提交
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217
	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;
		}
	}

Z
Zachary Amsden 已提交
1218
	for_each_possible_cpu(cpu) {
A
Avi Kivity 已提交
1219 1220
		r = svm_cpu_init(cpu);
		if (r)
1221
			goto err;
A
Avi Kivity 已提交
1222
	}
1223

1224
	if (!boot_cpu_has(X86_FEATURE_NPT))
1225 1226
		npt_enabled = false;

1227 1228 1229 1230 1231
	if (npt_enabled && !npt) {
		printk(KERN_INFO "kvm: Nested Paging disabled\n");
		npt_enabled = false;
	}

1232
	if (npt_enabled) {
1233
		printk(KERN_INFO "kvm: Nested Paging enabled\n");
1234
		kvm_enable_tdp();
1235 1236
	} else
		kvm_disable_tdp();
1237

1238 1239 1240
	if (avic) {
		if (!npt_enabled ||
		    !boot_cpu_has(X86_FEATURE_AVIC) ||
1241
		    !IS_ENABLED(CONFIG_X86_LOCAL_APIC)) {
1242
			avic = false;
1243
		} else {
1244
			pr_info("AVIC enabled\n");
1245 1246 1247

			amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
		}
1248
	}
1249

1250 1251
	if (vls) {
		if (!npt_enabled ||
1252
		    !boot_cpu_has(X86_FEATURE_V_VMSAVE_VMLOAD) ||
1253 1254 1255 1256 1257 1258 1259
		    !IS_ENABLED(CONFIG_X86_64)) {
			vls = false;
		} else {
			pr_info("Virtual VMLOAD VMSAVE supported\n");
		}
	}

1260 1261 1262 1263 1264 1265 1266
	if (vgif) {
		if (!boot_cpu_has(X86_FEATURE_VGIF))
			vgif = false;
		else
			pr_info("Virtual GIF supported\n");
	}

A
Avi Kivity 已提交
1267 1268
	return 0;

1269
err:
A
Avi Kivity 已提交
1270 1271 1272 1273 1274 1275 1276
	__free_pages(iopm_pages, IOPM_ALLOC_ORDER);
	iopm_base = 0;
	return r;
}

static __exit void svm_hardware_unsetup(void)
{
1277 1278
	int cpu;

B
Brijesh Singh 已提交
1279 1280 1281
	if (svm_sev_enabled())
		kfree(sev_asid_bitmap);

Z
Zachary Amsden 已提交
1282
	for_each_possible_cpu(cpu)
1283 1284
		svm_cpu_uninit(cpu);

A
Avi Kivity 已提交
1285
	__free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
1286
	iopm_base = 0;
A
Avi Kivity 已提交
1287 1288 1289 1290 1291 1292
}

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
1293
		      SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
A
Avi Kivity 已提交
1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305
	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;
}

1306 1307 1308 1309 1310
static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 g_tsc_offset = 0;

1311
	if (is_guest_mode(vcpu)) {
1312 1313 1314
		g_tsc_offset = svm->vmcb->control.tsc_offset -
			       svm->nested.hsave->control.tsc_offset;
		svm->nested.hsave->control.tsc_offset = offset;
1315 1316 1317 1318
	} else
		trace_kvm_write_tsc_offset(vcpu->vcpu_id,
					   svm->vmcb->control.tsc_offset,
					   offset);
1319 1320

	svm->vmcb->control.tsc_offset = offset + g_tsc_offset;
1321 1322

	mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
1323 1324
}

1325 1326 1327 1328
static void avic_init_vmcb(struct vcpu_svm *svm)
{
	struct vmcb *vmcb = svm->vmcb;
	struct kvm_arch *vm_data = &svm->vcpu.kvm->arch;
1329 1330 1331
	phys_addr_t bpa = __sme_set(page_to_phys(svm->avic_backing_page));
	phys_addr_t lpa = __sme_set(page_to_phys(vm_data->avic_logical_id_table_page));
	phys_addr_t ppa = __sme_set(page_to_phys(vm_data->avic_physical_id_table_page));
1332 1333 1334 1335 1336 1337 1338 1339

	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;
	vmcb->control.int_ctl |= AVIC_ENABLE_MASK;
}

P
Paolo Bonzini 已提交
1340
static void init_vmcb(struct vcpu_svm *svm)
A
Avi Kivity 已提交
1341
{
1342 1343
	struct vmcb_control_area *control = &svm->vmcb->control;
	struct vmcb_save_area *save = &svm->vmcb->save;
A
Avi Kivity 已提交
1344

1345
	svm->vcpu.arch.hflags = 0;
1346

1347 1348 1349 1350 1351 1352
	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);
1353 1354
	if (!kvm_vcpu_apicv_active(&svm->vcpu))
		set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
A
Avi Kivity 已提交
1355

1356
	set_dr_intercepts(svm);
A
Avi Kivity 已提交
1357

1358 1359 1360
	set_exception_intercept(svm, PF_VECTOR);
	set_exception_intercept(svm, UD_VECTOR);
	set_exception_intercept(svm, MC_VECTOR);
1361
	set_exception_intercept(svm, AC_VECTOR);
1362
	set_exception_intercept(svm, DB_VECTOR);
A
Avi Kivity 已提交
1363

1364 1365 1366 1367
	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
1368
	set_intercept(svm, INTERCEPT_RDPMC);
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385
	set_intercept(svm, INTERCEPT_CPUID);
	set_intercept(svm, INTERCEPT_INVD);
	set_intercept(svm, INTERCEPT_HLT);
	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
1386
	set_intercept(svm, INTERCEPT_XSETBV);
A
Avi Kivity 已提交
1387

1388 1389 1390 1391 1392
	if (!kvm_mwait_in_guest()) {
		set_intercept(svm, INTERCEPT_MONITOR);
		set_intercept(svm, INTERCEPT_MWAIT);
	}

1393 1394
	control->iopm_base_pa = __sme_set(iopm_base);
	control->msrpm_base_pa = __sme_set(__pa(svm->msrpm));
A
Avi Kivity 已提交
1395 1396 1397 1398 1399 1400 1401 1402 1403
	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;
1404
	save->cs.base = 0xffff0000;
A
Avi Kivity 已提交
1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
	/* 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
1416
	svm_set_efer(&svm->vcpu, 0);
M
Mike Day 已提交
1417
	save->dr6 = 0xffff0ff0;
1418
	kvm_set_rflags(&svm->vcpu, 2);
A
Avi Kivity 已提交
1419
	save->rip = 0x0000fff0;
1420
	svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;
A
Avi Kivity 已提交
1421

J
Joerg Roedel 已提交
1422
	/*
1423
	 * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
1424
	 * It also updates the guest-visible cr0 value.
A
Avi Kivity 已提交
1425
	 */
1426
	svm_set_cr0(&svm->vcpu, X86_CR0_NW | X86_CR0_CD | X86_CR0_ET);
1427
	kvm_mmu_reset_context(&svm->vcpu);
1428

1429
	save->cr4 = X86_CR4_PAE;
A
Avi Kivity 已提交
1430
	/* rdx = ?? */
1431 1432 1433

	if (npt_enabled) {
		/* Setup VMCB for Nested Paging */
1434
		control->nested_ctl |= SVM_NESTED_CTL_NP_ENABLE;
1435
		clr_intercept(svm, INTERCEPT_INVLPG);
1436
		clr_exception_intercept(svm, PF_VECTOR);
1437 1438
		clr_cr_intercept(svm, INTERCEPT_CR3_READ);
		clr_cr_intercept(svm, INTERCEPT_CR3_WRITE);
1439
		save->g_pat = svm->vcpu.arch.pat;
1440 1441 1442
		save->cr3 = 0;
		save->cr4 = 0;
	}
1443
	svm->asid_generation = 0;
1444

1445
	svm->nested.vmcb = 0;
1446 1447
	svm->vcpu.arch.hflags = 0;

1448
	if (boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
1449
		control->pause_filter_count = 3000;
1450
		set_intercept(svm, INTERCEPT_PAUSE);
1451 1452
	}

1453
	if (kvm_vcpu_apicv_active(&svm->vcpu))
1454 1455
		avic_init_vmcb(svm);

1456 1457 1458 1459 1460 1461 1462 1463 1464 1465
	/*
	 * 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;
	}

1466 1467 1468 1469 1470 1471
	if (vgif) {
		clr_intercept(svm, INTERCEPT_STGI);
		clr_intercept(svm, INTERCEPT_CLGI);
		svm->vmcb->control.int_ctl |= V_GIF_ENABLE_MASK;
	}

1472
	if (sev_guest(svm->vcpu.kvm)) {
B
Brijesh Singh 已提交
1473
		svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ENABLE;
1474 1475
		clr_exception_intercept(svm, UD_VECTOR);
	}
B
Brijesh Singh 已提交
1476

1477 1478
	mark_all_dirty(svm->vmcb);

1479
	enable_gif(svm);
1480 1481 1482

}

1483 1484
static u64 *avic_get_physical_id_entry(struct kvm_vcpu *vcpu,
				       unsigned int index)
1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548
{
	u64 *avic_physical_id_table;
	struct kvm_arch *vm_data = &vcpu->kvm->arch;

	if (index >= AVIC_MAX_PHYSICAL_ID_COUNT)
		return NULL;

	avic_physical_id_table = page_address(vm_data->avic_physical_id_table_page);

	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.
 */
static int avic_init_access_page(struct kvm_vcpu *vcpu)
{
	struct kvm *kvm = vcpu->kvm;
	int ret;

	if (kvm->arch.apic_access_page_done)
		return 0;

	ret = x86_set_memory_region(kvm,
				    APIC_ACCESS_PAGE_PRIVATE_MEMSLOT,
				    APIC_DEFAULT_PHYS_BASE,
				    PAGE_SIZE);
	if (ret)
		return ret;

	kvm->arch.apic_access_page_done = true;
	return 0;
}

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

	ret = avic_init_access_page(vcpu);
	if (ret)
		return ret;

	if (id >= AVIC_MAX_PHYSICAL_ID_COUNT)
		return -EINVAL;

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

	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;

	new_entry = READ_ONCE(*entry);
1549 1550 1551
	new_entry = __sme_set((page_to_phys(svm->avic_backing_page) &
			      AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK) |
			      AVIC_PHYSICAL_ID_ENTRY_VALID_MASK);
1552 1553 1554 1555 1556 1557 1558
	WRITE_ONCE(*entry, new_entry);

	svm->avic_physical_id_cache = entry;

	return 0;
}

B
Brijesh Singh 已提交
1559 1560
static void __sev_asid_free(int asid)
{
1561 1562
	struct svm_cpu_data *sd;
	int cpu, pos;
B
Brijesh Singh 已提交
1563 1564 1565

	pos = asid - 1;
	clear_bit(pos, sev_asid_bitmap);
1566 1567 1568 1569 1570

	for_each_possible_cpu(cpu) {
		sd = per_cpu(svm_data, cpu);
		sd->sev_vmcbs[pos] = NULL;
	}
B
Brijesh Singh 已提交
1571 1572 1573 1574 1575 1576 1577 1578 1579
}

static void sev_asid_free(struct kvm *kvm)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;

	__sev_asid_free(sev->asid);
}

1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
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;
	sev_guest_deactivate(data, NULL);

	wbinvd_on_all_cpus();
	sev_guest_df_flush(NULL);
	kfree(data);

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

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

	kfree(decommission);
}

1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687
static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr,
				    unsigned long ulen, unsigned long *n,
				    int write)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	unsigned long npages, npinned, size;
	unsigned long locked, lock_limit;
	struct page **pages;
	int first, last;

	/* 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)
		pages = vmalloc(size);
	else
		pages = kmalloc(size, GFP_KERNEL);

	if (!pages)
		return NULL;

	/* Pin the user virtual address. */
	npinned = get_user_pages_fast(uaddr, npages, write ? FOLL_WRITE : 0, pages);
	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)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;

	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);
	}
}

1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703
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);
}

B
Brijesh Singh 已提交
1704 1705
static void sev_vm_destroy(struct kvm *kvm)
{
1706
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
1707 1708
	struct list_head *head = &sev->regions_list;
	struct list_head *pos, *q;
1709

B
Brijesh Singh 已提交
1710 1711 1712
	if (!sev_guest(kvm))
		return;

1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
	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);

1728
	sev_unbind_asid(kvm, sev->handle);
B
Brijesh Singh 已提交
1729 1730 1731
	sev_asid_free(kvm);
}

1732 1733
static void avic_vm_destroy(struct kvm *kvm)
{
1734
	unsigned long flags;
1735 1736
	struct kvm_arch *vm_data = &kvm->arch;

1737 1738 1739
	if (!avic)
		return;

1740 1741 1742 1743
	if (vm_data->avic_logical_id_table_page)
		__free_page(vm_data->avic_logical_id_table_page);
	if (vm_data->avic_physical_id_table_page)
		__free_page(vm_data->avic_physical_id_table_page);
1744 1745 1746 1747

	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
	hash_del(&vm_data->hnode);
	spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
1748 1749
}

B
Brijesh Singh 已提交
1750 1751 1752 1753 1754 1755
static void svm_vm_destroy(struct kvm *kvm)
{
	avic_vm_destroy(kvm);
	sev_vm_destroy(kvm);
}

1756 1757
static int avic_vm_init(struct kvm *kvm)
{
1758
	unsigned long flags;
1759
	int err = -ENOMEM;
1760 1761 1762
	struct kvm_arch *vm_data = &kvm->arch;
	struct page *p_page;
	struct page *l_page;
1763 1764
	struct kvm_arch *ka;
	u32 vm_id;
1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784

	if (!avic)
		return 0;

	/* Allocating physical APIC ID table (4KB) */
	p_page = alloc_page(GFP_KERNEL);
	if (!p_page)
		goto free_avic;

	vm_data->avic_physical_id_table_page = p_page;
	clear_page(page_address(p_page));

	/* Allocating logical APIC ID table (4KB) */
	l_page = alloc_page(GFP_KERNEL);
	if (!l_page)
		goto free_avic;

	vm_data->avic_logical_id_table_page = l_page;
	clear_page(page_address(l_page));

1785
	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801
 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) {
		hash_for_each_possible(svm_vm_data_hash, ka, hnode, vm_id) {
			struct kvm *k2 = container_of(ka, struct kvm, arch);
			struct kvm_arch *vd2 = &k2->arch;
			if (vd2->avic_vm_id == vm_id)
				goto again;
		}
	}
	vm_data->avic_vm_id = vm_id;
1802 1803 1804
	hash_add(svm_vm_data_hash, &vm_data->hnode, vm_data->avic_vm_id);
	spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);

1805 1806 1807 1808 1809
	return 0;

free_avic:
	avic_vm_destroy(kvm);
	return err;
A
Avi Kivity 已提交
1810 1811
}

1812 1813
static inline int
avic_update_iommu_vcpu_affinity(struct kvm_vcpu *vcpu, int cpu, bool r)
1814
{
1815 1816 1817
	int ret = 0;
	unsigned long flags;
	struct amd_svm_iommu_ir *ir;
1818 1819
	struct vcpu_svm *svm = to_svm(vcpu);

1820 1821
	if (!kvm_arch_has_assigned_device(vcpu->kvm))
		return 0;
1822

1823 1824 1825 1826 1827
	/*
	 * 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);
1828

1829 1830
	if (list_empty(&svm->ir_list))
		goto out;
1831

1832 1833 1834 1835 1836 1837 1838 1839
	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;
1840 1841 1842 1843 1844 1845
}

static void avic_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	u64 entry;
	/* ID = 0xff (broadcast), ID > 0xff (reserved) */
1846
	int h_physical_id = kvm_cpu_get_apicid(cpu);
1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865
	struct vcpu_svm *svm = to_svm(vcpu);

	if (!kvm_vcpu_apicv_active(vcpu))
		return;

	if (WARN_ON(h_physical_id >= AVIC_MAX_PHYSICAL_ID_COUNT))
		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);
1866 1867
	avic_update_iommu_vcpu_affinity(vcpu, h_physical_id,
					svm->avic_is_running);
1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878
}

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));
1879 1880 1881
	if (entry & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK)
		avic_update_iommu_vcpu_affinity(vcpu, -1, 0);

1882 1883
	entry &= ~AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK;
	WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
A
Avi Kivity 已提交
1884 1885
}

1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899
/**
 * 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);
}

1900
static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
1901 1902
{
	struct vcpu_svm *svm = to_svm(vcpu);
1903 1904
	u32 dummy;
	u32 eax = 1;
1905

1906 1907
	svm->spec_ctrl = 0;

1908 1909 1910 1911 1912 1913
	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
1914
	init_vmcb(svm);
A
Avi Kivity 已提交
1915

1916
	kvm_cpuid(vcpu, &eax, &dummy, &dummy, &dummy, true);
1917
	kvm_register_write(vcpu, VCPU_REGS_RDX, eax);
1918 1919 1920

	if (kvm_vcpu_apicv_active(vcpu) && !init_event)
		avic_update_vapic_bar(svm, APIC_DEFAULT_PHYS_BASE);
1921 1922
}

1923 1924 1925 1926
static int avic_init_vcpu(struct vcpu_svm *svm)
{
	int ret;

1927
	if (!kvm_vcpu_apicv_active(&svm->vcpu))
1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
		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);

	return ret;
}

R
Rusty Russell 已提交
1940
static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
A
Avi Kivity 已提交
1941
{
1942
	struct vcpu_svm *svm;
A
Avi Kivity 已提交
1943
	struct page *page;
1944
	struct page *msrpm_pages;
A
Alexander Graf 已提交
1945
	struct page *hsave_page;
A
Alexander Graf 已提交
1946
	struct page *nested_msrpm_pages;
R
Rusty Russell 已提交
1947
	int err;
A
Avi Kivity 已提交
1948

1949
	svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
R
Rusty Russell 已提交
1950 1951 1952 1953 1954 1955 1956 1957 1958
	if (!svm) {
		err = -ENOMEM;
		goto out;
	}

	err = kvm_vcpu_init(&svm->vcpu, kvm, id);
	if (err)
		goto free_svm;

1959
	err = -ENOMEM;
A
Avi Kivity 已提交
1960
	page = alloc_page(GFP_KERNEL);
1961
	if (!page)
R
Rusty Russell 已提交
1962
		goto uninit;
A
Avi Kivity 已提交
1963

1964 1965
	msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
	if (!msrpm_pages)
1966
		goto free_page1;
A
Alexander Graf 已提交
1967 1968 1969

	nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
	if (!nested_msrpm_pages)
1970
		goto free_page2;
1971

A
Alexander Graf 已提交
1972 1973
	hsave_page = alloc_page(GFP_KERNEL);
	if (!hsave_page)
1974 1975
		goto free_page3;

1976 1977 1978
	err = avic_init_vcpu(svm);
	if (err)
		goto free_page4;
1979

1980 1981 1982 1983 1984
	/* We initialize this flag to true to make sure that the is_running
	 * bit would be set the first time the vcpu is loaded.
	 */
	svm->avic_is_running = true;

1985
	svm->nested.hsave = page_address(hsave_page);
A
Alexander Graf 已提交
1986

1987 1988 1989
	svm->msrpm = page_address(msrpm_pages);
	svm_vcpu_init_msrpm(svm->msrpm);

1990
	svm->nested.msrpm = page_address(nested_msrpm_pages);
1991
	svm_vcpu_init_msrpm(svm->nested.msrpm);
A
Alexander Graf 已提交
1992

1993 1994
	svm->vmcb = page_address(page);
	clear_page(svm->vmcb);
1995
	svm->vmcb_pa = __sme_set(page_to_pfn(page) << PAGE_SHIFT);
1996
	svm->asid_generation = 0;
P
Paolo Bonzini 已提交
1997
	init_vmcb(svm);
A
Avi Kivity 已提交
1998

1999 2000
	svm_init_osvw(&svm->vcpu);

R
Rusty Russell 已提交
2001
	return &svm->vcpu;
2002

2003 2004
free_page4:
	__free_page(hsave_page);
2005 2006 2007 2008 2009 2010
free_page3:
	__free_pages(nested_msrpm_pages, MSRPM_ALLOC_ORDER);
free_page2:
	__free_pages(msrpm_pages, MSRPM_ALLOC_ORDER);
free_page1:
	__free_page(page);
R
Rusty Russell 已提交
2011 2012 2013
uninit:
	kvm_vcpu_uninit(&svm->vcpu);
free_svm:
2014
	kmem_cache_free(kvm_vcpu_cache, svm);
R
Rusty Russell 已提交
2015 2016
out:
	return ERR_PTR(err);
A
Avi Kivity 已提交
2017 2018 2019 2020
}

static void svm_free_vcpu(struct kvm_vcpu *vcpu)
{
2021 2022
	struct vcpu_svm *svm = to_svm(vcpu);

2023
	__free_page(pfn_to_page(__sme_clr(svm->vmcb_pa) >> PAGE_SHIFT));
2024
	__free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
2025 2026
	__free_page(virt_to_page(svm->nested.hsave));
	__free_pages(virt_to_page(svm->nested.msrpm), MSRPM_ALLOC_ORDER);
R
Rusty Russell 已提交
2027
	kvm_vcpu_uninit(vcpu);
2028
	kmem_cache_free(kvm_vcpu_cache, svm);
A
Ashok Raj 已提交
2029 2030 2031 2032 2033
	/*
	 * The vmcb page can be recycled, causing a false negative in
	 * svm_vcpu_load(). So do a full IBPB now.
	 */
	indirect_branch_prediction_barrier();
A
Avi Kivity 已提交
2034 2035
}

2036
static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
A
Avi Kivity 已提交
2037
{
2038
	struct vcpu_svm *svm = to_svm(vcpu);
A
Ashok Raj 已提交
2039
	struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
2040
	int i;
2041 2042

	if (unlikely(cpu != vcpu->cpu)) {
2043
		svm->asid_generation = 0;
2044
		mark_all_dirty(svm->vmcb);
2045
	}
2046

2047 2048 2049
#ifdef CONFIG_X86_64
	rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host.gs_base);
#endif
2050 2051 2052 2053
	savesegment(fs, svm->host.fs);
	savesegment(gs, svm->host.gs);
	svm->host.ldt = kvm_read_ldt();

2054
	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
2055
		rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
2056

2057 2058 2059 2060 2061 2062
	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);
		}
2063
	}
P
Paolo Bonzini 已提交
2064 2065 2066
	/* This assumes that the kernel never uses MSR_TSC_AUX */
	if (static_cpu_has(X86_FEATURE_RDTSCP))
		wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
2067

A
Ashok Raj 已提交
2068 2069 2070 2071
	if (sd->current_vmcb != svm->vmcb) {
		sd->current_vmcb = svm->vmcb;
		indirect_branch_prediction_barrier();
	}
2072
	avic_vcpu_load(vcpu, cpu);
A
Avi Kivity 已提交
2073 2074 2075 2076
}

static void svm_vcpu_put(struct kvm_vcpu *vcpu)
{
2077
	struct vcpu_svm *svm = to_svm(vcpu);
2078 2079
	int i;

2080 2081
	avic_vcpu_put(vcpu);

2082
	++vcpu->stat.host_state_reload;
2083 2084 2085
	kvm_load_ldt(svm->host.ldt);
#ifdef CONFIG_X86_64
	loadsegment(fs, svm->host.fs);
2086
	wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gsbase);
2087
	load_gs_index(svm->host.gs);
2088
#else
2089
#ifdef CONFIG_X86_32_LAZY_GS
2090
	loadsegment(gs, svm->host.gs);
2091
#endif
2092
#endif
2093
	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
2094
		wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
A
Avi Kivity 已提交
2095 2096
}

2097 2098 2099 2100 2101 2102 2103 2104 2105 2106
static void svm_vcpu_blocking(struct kvm_vcpu *vcpu)
{
	avic_set_running(vcpu, false);
}

static void svm_vcpu_unblocking(struct kvm_vcpu *vcpu)
{
	avic_set_running(vcpu, true);
}

A
Avi Kivity 已提交
2107 2108
static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
{
2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119
	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
2120 2121 2122 2123
}

static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
2124 2125 2126
	if (to_svm(vcpu)->nmi_singlestep)
		rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);

P
Paolo Bonzini 已提交
2127
       /*
A
Andrea Gelmini 已提交
2128
        * Any change of EFLAGS.VM is accompanied by a reload of SS
P
Paolo Bonzini 已提交
2129 2130 2131
        * (caused by either a task switch or an inter-privilege IRET),
        * so we do not need to update the CPL here.
        */
2132
	to_svm(vcpu)->vmcb->save.rflags = rflags;
A
Avi Kivity 已提交
2133 2134
}

A
Avi Kivity 已提交
2135 2136 2137 2138 2139
static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
{
	switch (reg) {
	case VCPU_EXREG_PDPTR:
		BUG_ON(!npt_enabled);
2140
		load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
A
Avi Kivity 已提交
2141 2142 2143 2144 2145 2146
		break;
	default:
		BUG();
	}
}

2147 2148
static void svm_set_vintr(struct vcpu_svm *svm)
{
2149
	set_intercept(svm, INTERCEPT_VINTR);
2150 2151 2152 2153
}

static void svm_clear_vintr(struct vcpu_svm *svm)
{
2154
	clr_intercept(svm, INTERCEPT_VINTR);
2155 2156
}

A
Avi Kivity 已提交
2157 2158
static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
{
2159
	struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
A
Avi Kivity 已提交
2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171

	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
2172
	return NULL;
A
Avi Kivity 已提交
2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
}

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;
2197 2198 2199 2200 2201 2202 2203 2204 2205 2206

	/*
	 * 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;
2207

J
Joerg Roedel 已提交
2208 2209
	/*
	 * AMD's VMCB does not have an explicit unusable field, so emulate it
2210 2211
	 * for cross vendor migration purposes by "not present"
	 */
2212
	var->unusable = !var->present;
2213

2214 2215 2216 2217 2218 2219
	switch (seg) {
	case VCPU_SREG_TR:
		/*
		 * Work around a bug where the busy flag in the tr selector
		 * isn't exposed
		 */
2220
		var->type |= 0x2;
2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235
		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;
2236
	case VCPU_SREG_SS:
J
Joerg Roedel 已提交
2237 2238
		/*
		 * On AMD CPUs sometimes the DB bit in the segment
2239 2240 2241 2242 2243 2244
		 * 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;
2245
		/* This is symmetric with svm_set_segment() */
J
Jan Kiszka 已提交
2246
		var->dpl = to_svm(vcpu)->vmcb->save.cpl;
2247
		break;
2248
	}
A
Avi Kivity 已提交
2249 2250
}

2251 2252 2253 2254 2255 2256 2257
static int svm_get_cpl(struct kvm_vcpu *vcpu)
{
	struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;

	return save->cpl;
}

2258
static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2259
{
2260 2261
	struct vcpu_svm *svm = to_svm(vcpu);

2262 2263
	dt->size = svm->vmcb->save.idtr.limit;
	dt->address = svm->vmcb->save.idtr.base;
A
Avi Kivity 已提交
2264 2265
}

2266
static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2267
{
2268 2269
	struct vcpu_svm *svm = to_svm(vcpu);

2270 2271
	svm->vmcb->save.idtr.limit = dt->size;
	svm->vmcb->save.idtr.base = dt->address ;
2272
	mark_dirty(svm->vmcb, VMCB_DT);
A
Avi Kivity 已提交
2273 2274
}

2275
static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2276
{
2277 2278
	struct vcpu_svm *svm = to_svm(vcpu);

2279 2280
	dt->size = svm->vmcb->save.gdtr.limit;
	dt->address = svm->vmcb->save.gdtr.base;
A
Avi Kivity 已提交
2281 2282
}

2283
static void svm_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2284
{
2285 2286
	struct vcpu_svm *svm = to_svm(vcpu);

2287 2288
	svm->vmcb->save.gdtr.limit = dt->size;
	svm->vmcb->save.gdtr.base = dt->address ;
2289
	mark_dirty(svm->vmcb, VMCB_DT);
A
Avi Kivity 已提交
2290 2291
}

2292 2293 2294 2295
static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
{
}

2296 2297 2298 2299
static void svm_decache_cr3(struct kvm_vcpu *vcpu)
{
}

2300
static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
2301 2302 2303
{
}

A
Avi Kivity 已提交
2304 2305 2306 2307 2308
static void update_cr0_intercept(struct vcpu_svm *svm)
{
	ulong gcr0 = svm->vcpu.arch.cr0;
	u64 *hcr0 = &svm->vmcb->save.cr0;

2309 2310
	*hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
		| (gcr0 & SVM_CR0_SELECTIVE_MASK);
A
Avi Kivity 已提交
2311

2312
	mark_dirty(svm->vmcb, VMCB_CR);
A
Avi Kivity 已提交
2313

2314
	if (gcr0 == *hcr0) {
2315 2316
		clr_cr_intercept(svm, INTERCEPT_CR0_READ);
		clr_cr_intercept(svm, INTERCEPT_CR0_WRITE);
A
Avi Kivity 已提交
2317
	} else {
2318 2319
		set_cr_intercept(svm, INTERCEPT_CR0_READ);
		set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
A
Avi Kivity 已提交
2320 2321 2322
	}
}

A
Avi Kivity 已提交
2323 2324
static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
2325 2326
	struct vcpu_svm *svm = to_svm(vcpu);

2327
#ifdef CONFIG_X86_64
2328
	if (vcpu->arch.efer & EFER_LME) {
2329
		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
2330
			vcpu->arch.efer |= EFER_LMA;
2331
			svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
A
Avi Kivity 已提交
2332 2333
		}

M
Mike Day 已提交
2334
		if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
2335
			vcpu->arch.efer &= ~EFER_LMA;
2336
			svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
A
Avi Kivity 已提交
2337 2338 2339
		}
	}
#endif
2340
	vcpu->arch.cr0 = cr0;
2341 2342 2343

	if (!npt_enabled)
		cr0 |= X86_CR0_PG | X86_CR0_WP;
2344

2345 2346 2347 2348 2349 2350 2351
	/*
	 * 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);
2352
	svm->vmcb->save.cr0 = cr0;
2353
	mark_dirty(svm->vmcb, VMCB_CR);
A
Avi Kivity 已提交
2354
	update_cr0_intercept(svm);
A
Avi Kivity 已提交
2355 2356
}

2357
static int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
A
Avi Kivity 已提交
2358
{
2359
	unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
2360 2361
	unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;

2362 2363 2364
	if (cr4 & X86_CR4_VMXE)
		return 1;

2365
	if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
2366
		svm_flush_tlb(vcpu, true);
2367

2368 2369 2370
	vcpu->arch.cr4 = cr4;
	if (!npt_enabled)
		cr4 |= X86_CR4_PAE;
2371
	cr4 |= host_cr4_mce;
2372
	to_svm(vcpu)->vmcb->save.cr4 = cr4;
2373
	mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
2374
	return 0;
A
Avi Kivity 已提交
2375 2376 2377 2378 2379
}

static void svm_set_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
2380
	struct vcpu_svm *svm = to_svm(vcpu);
A
Avi Kivity 已提交
2381 2382 2383 2384 2385
	struct vmcb_seg *s = svm_seg(vcpu, seg);

	s->base = var->base;
	s->limit = var->limit;
	s->selector = var->selector;
2386 2387 2388 2389 2390 2391 2392 2393
	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
2394 2395 2396 2397 2398 2399 2400 2401

	/*
	 * 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)
2402 2403
		/* This is symmetric with svm_get_segment() */
		svm->vmcb->save.cpl = (var->dpl & 3);
A
Avi Kivity 已提交
2404

2405
	mark_dirty(svm->vmcb, VMCB_SEG);
A
Avi Kivity 已提交
2406 2407
}

2408
static void update_bp_intercept(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
2409
{
J
Jan Kiszka 已提交
2410 2411
	struct vcpu_svm *svm = to_svm(vcpu);

2412
	clr_exception_intercept(svm, BP_VECTOR);
2413

J
Jan Kiszka 已提交
2414 2415
	if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
2416
			set_exception_intercept(svm, BP_VECTOR);
J
Jan Kiszka 已提交
2417 2418
	} else
		vcpu->guest_debug = 0;
2419 2420
}

2421
static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
A
Avi Kivity 已提交
2422
{
2423 2424
	if (sd->next_asid > sd->max_asid) {
		++sd->asid_generation;
2425
		sd->next_asid = sd->min_asid;
2426
		svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
A
Avi Kivity 已提交
2427 2428
	}

2429 2430
	svm->asid_generation = sd->asid_generation;
	svm->vmcb->control.asid = sd->next_asid++;
2431 2432

	mark_dirty(svm->vmcb, VMCB_ASID);
A
Avi Kivity 已提交
2433 2434
}

J
Jan Kiszka 已提交
2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447
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);
}

2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462
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);
}

2463
static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
A
Avi Kivity 已提交
2464
{
2465 2466
	struct vcpu_svm *svm = to_svm(vcpu);

2467
	svm->vmcb->save.dr7 = value;
2468
	mark_dirty(svm->vmcb, VMCB_DR);
A
Avi Kivity 已提交
2469 2470
}

A
Avi Kivity 已提交
2471
static int pf_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2472
{
2473
	u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
2474
	u64 error_code = svm->vmcb->control.exit_info_1;
A
Avi Kivity 已提交
2475

2476
	return kvm_handle_page_fault(&svm->vcpu, error_code, fault_address,
2477 2478
			static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
			svm->vmcb->control.insn_bytes : NULL,
2479 2480 2481 2482 2483
			svm->vmcb->control.insn_len);
}

static int npf_interception(struct vcpu_svm *svm)
{
2484
	u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
2485 2486 2487 2488
	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,
2489 2490
			static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
			svm->vmcb->control.insn_bytes : NULL,
2491
			svm->vmcb->control.insn_len);
A
Avi Kivity 已提交
2492 2493
}

A
Avi Kivity 已提交
2494
static int db_interception(struct vcpu_svm *svm)
J
Jan Kiszka 已提交
2495
{
A
Avi Kivity 已提交
2496 2497
	struct kvm_run *kvm_run = svm->vcpu.run;

J
Jan Kiszka 已提交
2498
	if (!(svm->vcpu.guest_debug &
2499
	      (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
J
Jan Kiszka 已提交
2500
		!svm->nmi_singlestep) {
J
Jan Kiszka 已提交
2501 2502 2503
		kvm_queue_exception(&svm->vcpu, DB_VECTOR);
		return 1;
	}
2504

J
Jan Kiszka 已提交
2505
	if (svm->nmi_singlestep) {
2506
		disable_nmi_singlestep(svm);
2507 2508 2509
	}

	if (svm->vcpu.guest_debug &
J
Joerg Roedel 已提交
2510
	    (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
2511 2512 2513 2514 2515 2516 2517 2518
		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
2519 2520
}

A
Avi Kivity 已提交
2521
static int bp_interception(struct vcpu_svm *svm)
J
Jan Kiszka 已提交
2522
{
A
Avi Kivity 已提交
2523 2524
	struct kvm_run *kvm_run = svm->vcpu.run;

J
Jan Kiszka 已提交
2525 2526 2527 2528 2529 2530
	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
2531
static int ud_interception(struct vcpu_svm *svm)
2532 2533 2534
{
	int er;

2535
	er = emulate_instruction(&svm->vcpu, EMULTYPE_TRAP_UD);
2536 2537
	if (er == EMULATE_USER_EXIT)
		return 0;
2538
	if (er != EMULATE_DONE)
2539
		kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2540 2541 2542
	return 1;
}

2543 2544 2545 2546 2547 2548
static int ac_interception(struct vcpu_svm *svm)
{
	kvm_queue_exception_e(&svm->vcpu, AC_VECTOR, 0);
	return 1;
}

2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587
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;
}

2588
static void svm_handle_mce(struct vcpu_svm *svm)
2589
{
2590 2591 2592 2593 2594 2595 2596
	if (is_erratum_383()) {
		/*
		 * Erratum 383 triggered. Guest state is corrupt so kill the
		 * guest.
		 */
		pr_err("KVM: Guest triggered AMD Erratum 383\n");

2597
		kvm_make_request(KVM_REQ_TRIPLE_FAULT, &svm->vcpu);
2598 2599 2600 2601

		return;
	}

2602 2603 2604 2605 2606 2607 2608 2609
	/*
	 * 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 */

2610 2611 2612 2613 2614
	return;
}

static int mc_interception(struct vcpu_svm *svm)
{
2615 2616 2617
	return 1;
}

A
Avi Kivity 已提交
2618
static int shutdown_interception(struct vcpu_svm *svm)
2619
{
A
Avi Kivity 已提交
2620 2621
	struct kvm_run *kvm_run = svm->vcpu.run;

2622 2623 2624 2625
	/*
	 * VMCB is undefined after a SHUTDOWN intercept
	 * so reinitialize it.
	 */
2626
	clear_page(svm->vmcb);
P
Paolo Bonzini 已提交
2627
	init_vmcb(svm);
2628 2629 2630 2631 2632

	kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
	return 0;
}

A
Avi Kivity 已提交
2633
static int io_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2634
{
2635
	struct kvm_vcpu *vcpu = &svm->vcpu;
M
Mike Day 已提交
2636
	u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
2637
	int size, in, string, ret;
2638
	unsigned port;
A
Avi Kivity 已提交
2639

R
Rusty Russell 已提交
2640
	++svm->vcpu.stat.io_exits;
2641
	string = (io_info & SVM_IOIO_STR_MASK) != 0;
2642
	in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
2643
	if (string)
2644
		return emulate_instruction(vcpu, 0) == EMULATE_DONE;
2645

2646 2647
	port = io_info >> 16;
	size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
2648
	svm->next_rip = svm->vmcb->control.exit_info_2;
2649
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
2650

2651 2652 2653 2654 2655 2656 2657 2658
	/*
	 * TODO: we might be squashing a KVM_GUESTDBG_SINGLESTEP-triggered
	 * KVM_EXIT_DEBUG here.
	 */
	if (in)
		return kvm_fast_pio_in(vcpu, size, port) && ret;
	else
		return kvm_fast_pio_out(vcpu, size, port) && ret;
A
Avi Kivity 已提交
2659 2660
}

A
Avi Kivity 已提交
2661
static int nmi_interception(struct vcpu_svm *svm)
2662 2663 2664 2665
{
	return 1;
}

A
Avi Kivity 已提交
2666
static int intr_interception(struct vcpu_svm *svm)
2667 2668 2669 2670 2671
{
	++svm->vcpu.stat.irq_exits;
	return 1;
}

A
Avi Kivity 已提交
2672
static int nop_on_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2673 2674 2675 2676
{
	return 1;
}

A
Avi Kivity 已提交
2677
static int halt_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2678
{
2679
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 1;
R
Rusty Russell 已提交
2680
	return kvm_emulate_halt(&svm->vcpu);
A
Avi Kivity 已提交
2681 2682
}

A
Avi Kivity 已提交
2683
static int vmmcall_interception(struct vcpu_svm *svm)
2684
{
2685
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2686
	return kvm_emulate_hypercall(&svm->vcpu);
2687 2688
}

2689 2690 2691 2692 2693 2694 2695
static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	return svm->nested.nested_cr3;
}

2696 2697 2698 2699 2700 2701 2702
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;

2703
	ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(__sme_clr(cr3)), &pdpte,
2704
				       offset_in_page(cr3) + index * 8, 8);
2705 2706 2707 2708 2709
	if (ret)
		return 0;
	return pdpte;
}

2710 2711 2712 2713 2714
static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,
				   unsigned long root)
{
	struct vcpu_svm *svm = to_svm(vcpu);

2715
	svm->vmcb->control.nested_cr3 = __sme_set(root);
2716
	mark_dirty(svm->vmcb, VMCB_NPT);
2717
	svm_flush_tlb(vcpu, true);
2718 2719
}

2720 2721
static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
				       struct x86_exception *fault)
2722 2723 2724
{
	struct vcpu_svm *svm = to_svm(vcpu);

2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744
	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;
2745 2746 2747 2748

	nested_svm_vmexit(svm);
}

2749
static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
2750
{
2751 2752
	WARN_ON(mmu_is_nested(vcpu));
	kvm_init_shadow_mmu(vcpu);
2753 2754
	vcpu->arch.mmu.set_cr3           = nested_svm_set_tdp_cr3;
	vcpu->arch.mmu.get_cr3           = nested_svm_get_tdp_cr3;
2755
	vcpu->arch.mmu.get_pdptr         = nested_svm_get_tdp_pdptr;
2756
	vcpu->arch.mmu.inject_page_fault = nested_svm_inject_npf_exit;
2757
	vcpu->arch.mmu.shadow_root_level = get_npt_level(vcpu);
2758
	reset_shadow_zero_bits_mask(vcpu, &vcpu->arch.mmu);
2759 2760 2761 2762 2763 2764 2765 2766
	vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
}

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

2767 2768
static int nested_svm_check_permissions(struct vcpu_svm *svm)
{
2769 2770
	if (!(svm->vcpu.arch.efer & EFER_SVME) ||
	    !is_paging(&svm->vcpu)) {
2771 2772 2773 2774 2775 2776 2777 2778 2779
		kvm_queue_exception(&svm->vcpu, UD_VECTOR);
		return 1;
	}

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

2780
	return 0;
2781 2782
}

2783 2784 2785
static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
				      bool has_error_code, u32 error_code)
{
2786 2787
	int vmexit;

2788
	if (!is_guest_mode(&svm->vcpu))
2789
		return 0;
2790

2791 2792 2793 2794
	vmexit = nested_svm_intercept(svm);
	if (vmexit != NESTED_EXIT_DONE)
		return 0;

2795 2796 2797
	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;
2798 2799 2800 2801 2802 2803 2804 2805 2806 2807

	/*
	 * FIXME: we should not write CR2 when L1 intercepts an L2 #PF exception.
	 * The fix is to add the ancillary datum (CR2 or DR6) to structs
	 * kvm_queued_exception and kvm_vcpu_events, so that CR2 and DR6 can be
	 * written only when inject_pending_event runs (DR6 would written here
	 * too).  This should be conditional on a new capability---if the
	 * capability is disabled, kvm_multiple_exception would write the
	 * ancillary information to CR2 or DR6, for backwards ABI-compatibility.
	 */
2808 2809 2810 2811
	if (svm->vcpu.arch.exception.nested_apf)
		svm->vmcb->control.exit_info_2 = svm->vcpu.arch.apf.nested_apf_token;
	else
		svm->vmcb->control.exit_info_2 = svm->vcpu.arch.cr2;
2812

2813
	svm->nested.exit_required = true;
2814
	return vmexit;
2815 2816
}

2817 2818
/* This function returns true if it is save to enable the irq window */
static inline bool nested_svm_intr(struct vcpu_svm *svm)
2819
{
2820
	if (!is_guest_mode(&svm->vcpu))
2821
		return true;
2822

2823
	if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
2824
		return true;
2825

2826
	if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
2827
		return false;
2828

2829 2830 2831 2832 2833 2834 2835 2836
	/*
	 * 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;

2837 2838 2839
	svm->vmcb->control.exit_code   = SVM_EXIT_INTR;
	svm->vmcb->control.exit_info_1 = 0;
	svm->vmcb->control.exit_info_2 = 0;
2840

2841 2842 2843
	if (svm->nested.intercept & 1ULL) {
		/*
		 * The #vmexit can't be emulated here directly because this
G
Guo Chao 已提交
2844
		 * code path runs with irqs and preemption disabled. A
2845 2846 2847 2848
		 * #vmexit emulation might sleep. Only signal request for
		 * the #vmexit here.
		 */
		svm->nested.exit_required = true;
2849
		trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
2850
		return false;
2851 2852
	}

2853
	return true;
2854 2855
}

2856 2857 2858
/* This function returns true if it is save to enable the nmi window */
static inline bool nested_svm_nmi(struct vcpu_svm *svm)
{
2859
	if (!is_guest_mode(&svm->vcpu))
2860 2861 2862 2863 2864 2865 2866 2867 2868
		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;
2869 2870
}

2871
static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page)
2872 2873 2874
{
	struct page *page;

2875 2876
	might_sleep();

2877
	page = kvm_vcpu_gfn_to_page(&svm->vcpu, gpa >> PAGE_SHIFT);
2878 2879 2880
	if (is_error_page(page))
		goto error;

2881 2882 2883
	*_page = page;

	return kmap(page);
2884 2885 2886 2887 2888 2889 2890

error:
	kvm_inject_gp(&svm->vcpu, 0);

	return NULL;
}

2891
static void nested_svm_unmap(struct page *page)
2892
{
2893
	kunmap(page);
2894 2895 2896
	kvm_release_page_dirty(page);
}

2897 2898
static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
{
2899 2900 2901
	unsigned port, size, iopm_len;
	u16 val, mask;
	u8 start_bit;
2902
	u64 gpa;
2903

2904 2905
	if (!(svm->nested.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
		return NESTED_EXIT_HOST;
2906

2907
	port = svm->vmcb->control.exit_info_1 >> 16;
2908 2909
	size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
		SVM_IOIO_SIZE_SHIFT;
2910
	gpa  = svm->nested.vmcb_iopm + (port / 8);
2911 2912 2913 2914
	start_bit = port % 8;
	iopm_len = (start_bit + size > 8) ? 2 : 1;
	mask = (0xf >> (4 - size)) << start_bit;
	val = 0;
2915

2916
	if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
2917
		return NESTED_EXIT_DONE;
2918

2919
	return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
2920 2921
}

2922
static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
2923
{
2924 2925
	u32 offset, msr, value;
	int write, mask;
2926

2927
	if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
2928
		return NESTED_EXIT_HOST;
2929

2930 2931 2932 2933
	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);
2934

2935 2936
	if (offset == MSR_INVALID)
		return NESTED_EXIT_DONE;
2937

2938 2939
	/* Offset is in 32 bit units but need in 8 bit units */
	offset *= 4;
2940

2941
	if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.vmcb_msrpm + offset, &value, 4))
2942
		return NESTED_EXIT_DONE;
2943

2944
	return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
2945 2946
}

2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971
/* 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;
}

2972
static int nested_svm_exit_special(struct vcpu_svm *svm)
2973 2974
{
	u32 exit_code = svm->vmcb->control.exit_code;
2975

2976 2977 2978
	switch (exit_code) {
	case SVM_EXIT_INTR:
	case SVM_EXIT_NMI:
2979
	case SVM_EXIT_EXCP_BASE + MC_VECTOR:
2980 2981
		return NESTED_EXIT_HOST;
	case SVM_EXIT_NPF:
J
Joerg Roedel 已提交
2982
		/* For now we are always handling NPFs when using them */
2983 2984 2985 2986
		if (npt_enabled)
			return NESTED_EXIT_HOST;
		break;
	case SVM_EXIT_EXCP_BASE + PF_VECTOR:
G
Gleb Natapov 已提交
2987
		/* When we're shadowing, trap PFs, but not async PF */
2988
		if (!npt_enabled && svm->vcpu.arch.apf.host_apf_reason == 0)
2989 2990 2991 2992
			return NESTED_EXIT_HOST;
		break;
	default:
		break;
2993 2994
	}

2995 2996 2997 2998 2999 3000
	return NESTED_EXIT_CONTINUE;
}

/*
 * If this function returns true, this #vmexit was already handled
 */
3001
static int nested_svm_intercept(struct vcpu_svm *svm)
3002 3003 3004 3005
{
	u32 exit_code = svm->vmcb->control.exit_code;
	int vmexit = NESTED_EXIT_HOST;

3006
	switch (exit_code) {
3007
	case SVM_EXIT_MSR:
3008
		vmexit = nested_svm_exit_handled_msr(svm);
3009
		break;
3010 3011 3012
	case SVM_EXIT_IOIO:
		vmexit = nested_svm_intercept_ioio(svm);
		break;
3013 3014 3015
	case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
		u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0);
		if (svm->nested.intercept_cr & bit)
3016
			vmexit = NESTED_EXIT_DONE;
3017 3018
		break;
	}
3019 3020 3021
	case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
		u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
		if (svm->nested.intercept_dr & bit)
3022
			vmexit = NESTED_EXIT_DONE;
3023 3024 3025 3026
		break;
	}
	case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
		u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
3027 3028 3029 3030 3031 3032
		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
3033 3034
		/* async page fault always cause vmexit */
		else if ((exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR) &&
3035
			 svm->vcpu.arch.exception.nested_apf != 0)
G
Gleb Natapov 已提交
3036
			vmexit = NESTED_EXIT_DONE;
3037 3038
		break;
	}
3039 3040 3041 3042
	case SVM_EXIT_ERR: {
		vmexit = NESTED_EXIT_DONE;
		break;
	}
3043 3044
	default: {
		u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
J
Joerg Roedel 已提交
3045
		if (svm->nested.intercept & exit_bits)
3046
			vmexit = NESTED_EXIT_DONE;
3047 3048 3049
	}
	}

3050 3051 3052 3053 3054 3055 3056 3057 3058 3059
	return vmexit;
}

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

	vmexit = nested_svm_intercept(svm);

	if (vmexit == NESTED_EXIT_DONE)
3060 3061 3062
		nested_svm_vmexit(svm);

	return vmexit;
3063 3064
}

3065 3066 3067 3068 3069
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;

3070
	dst->intercept_cr         = from->intercept_cr;
3071
	dst->intercept_dr         = from->intercept_dr;
3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091
	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;
3092
	dst->virt_ext              = from->virt_ext;
3093 3094
}

3095
static int nested_svm_vmexit(struct vcpu_svm *svm)
3096
{
3097
	struct vmcb *nested_vmcb;
3098
	struct vmcb *hsave = svm->nested.hsave;
J
Joerg Roedel 已提交
3099
	struct vmcb *vmcb = svm->vmcb;
3100
	struct page *page;
3101

3102 3103 3104 3105
	trace_kvm_nested_vmexit_inject(vmcb->control.exit_code,
				       vmcb->control.exit_info_1,
				       vmcb->control.exit_info_2,
				       vmcb->control.exit_int_info,
3106 3107
				       vmcb->control.exit_int_info_err,
				       KVM_ISA_SVM);
3108

3109
	nested_vmcb = nested_svm_map(svm, svm->nested.vmcb, &page);
3110 3111 3112
	if (!nested_vmcb)
		return 1;

3113 3114
	/* Exit Guest-Mode */
	leave_guest_mode(&svm->vcpu);
3115 3116
	svm->nested.vmcb = 0;

3117
	/* Give the current vmcb to the guest */
J
Joerg Roedel 已提交
3118 3119 3120 3121 3122 3123 3124 3125
	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;
3126
	nested_vmcb->save.efer   = svm->vcpu.arch.efer;
3127
	nested_vmcb->save.cr0    = kvm_read_cr0(&svm->vcpu);
3128
	nested_vmcb->save.cr3    = kvm_read_cr3(&svm->vcpu);
J
Joerg Roedel 已提交
3129
	nested_vmcb->save.cr2    = vmcb->save.cr2;
3130
	nested_vmcb->save.cr4    = svm->vcpu.arch.cr4;
3131
	nested_vmcb->save.rflags = kvm_get_rflags(&svm->vcpu);
J
Joerg Roedel 已提交
3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147
	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;
3148 3149 3150

	if (svm->nrips_enabled)
		nested_vmcb->control.next_rip  = vmcb->control.next_rip;
3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166

	/*
	 * 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
3167 3168 3169
	nested_vmcb->control.tlb_ctl           = 0;
	nested_vmcb->control.event_inj         = 0;
	nested_vmcb->control.event_inj_err     = 0;
3170 3171 3172 3173 3174 3175

	/* 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 */
3176
	copy_vmcb_control_area(vmcb, hsave);
3177

3178 3179
	kvm_clear_exception_queue(&svm->vcpu);
	kvm_clear_interrupt_queue(&svm->vcpu);
3180

3181 3182
	svm->nested.nested_cr3 = 0;

3183 3184 3185 3186 3187 3188 3189
	/* 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;
3190
	kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
3191 3192 3193 3194 3195 3196 3197
	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 {
3198
		(void)kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
3199 3200 3201 3202 3203 3204 3205 3206
	}
	kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, hsave->save.rax);
	kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, hsave->save.rsp);
	kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, hsave->save.rip);
	svm->vmcb->save.dr7 = 0;
	svm->vmcb->save.cpl = 0;
	svm->vmcb->control.exit_int_info = 0;

3207 3208
	mark_all_dirty(svm->vmcb);

3209
	nested_svm_unmap(page);
3210

3211
	nested_svm_uninit_mmu_context(&svm->vcpu);
3212 3213 3214 3215 3216
	kvm_mmu_reset_context(&svm->vcpu);
	kvm_mmu_load(&svm->vcpu);

	return 0;
}
A
Alexander Graf 已提交
3217

3218
static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
A
Alexander Graf 已提交
3219
{
3220 3221
	/*
	 * This function merges the msr permission bitmaps of kvm and the
G
Guo Chao 已提交
3222
	 * nested vmcb. It is optimized in that it only merges the parts where
3223 3224
	 * the kvm msr permission bitmap may contain zero bits
	 */
A
Alexander Graf 已提交
3225
	int i;
3226

3227 3228
	if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
		return true;
3229

3230 3231 3232
	for (i = 0; i < MSRPM_OFFSETS; i++) {
		u32 value, p;
		u64 offset;
3233

3234 3235
		if (msrpm_offsets[i] == 0xffffffff)
			break;
A
Alexander Graf 已提交
3236

3237 3238
		p      = msrpm_offsets[i];
		offset = svm->nested.vmcb_msrpm + (p * 4);
3239

3240
		if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
3241 3242 3243 3244
			return false;

		svm->nested.msrpm[p] = svm->msrpm[p] | value;
	}
A
Alexander Graf 已提交
3245

3246
	svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm));
3247 3248

	return true;
A
Alexander Graf 已提交
3249 3250
}

3251 3252 3253 3254 3255
static bool nested_vmcb_checks(struct vmcb *vmcb)
{
	if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
		return false;

3256 3257 3258
	if (vmcb->control.asid == 0)
		return false;

3259 3260
	if ((vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) &&
	    !npt_enabled)
3261 3262
		return false;

3263 3264 3265
	return true;
}

L
Ladi Prosek 已提交
3266 3267
static void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
				 struct vmcb *nested_vmcb, struct page *page)
A
Alexander Graf 已提交
3268
{
3269
	if (kvm_get_rflags(&svm->vcpu) & X86_EFLAGS_IF)
A
Alexander Graf 已提交
3270 3271 3272 3273
		svm->vcpu.arch.hflags |= HF_HIF_MASK;
	else
		svm->vcpu.arch.hflags &= ~HF_HIF_MASK;

3274
	if (nested_vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) {
3275 3276 3277 3278 3279
		kvm_mmu_unload(&svm->vcpu);
		svm->nested.nested_cr3 = nested_vmcb->control.nested_cr3;
		nested_svm_init_mmu_context(&svm->vcpu);
	}

A
Alexander Graf 已提交
3280 3281 3282 3283 3284 3285 3286
	/* 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;
3287
	kvm_set_rflags(&svm->vcpu, nested_vmcb->save.rflags);
A
Alexander Graf 已提交
3288 3289 3290 3291 3292 3293
	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;
3294
	} else
3295
		(void)kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
3296 3297 3298 3299

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

J
Joerg Roedel 已提交
3300
	svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
A
Alexander Graf 已提交
3301 3302 3303
	kvm_register_write(&svm->vcpu, VCPU_REGS_RAX, nested_vmcb->save.rax);
	kvm_register_write(&svm->vcpu, VCPU_REGS_RSP, nested_vmcb->save.rsp);
	kvm_register_write(&svm->vcpu, VCPU_REGS_RIP, nested_vmcb->save.rip);
J
Joerg Roedel 已提交
3304

A
Alexander Graf 已提交
3305 3306 3307 3308 3309 3310 3311 3312
	/* 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;

3313
	svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
3314
	svm->nested.vmcb_iopm  = nested_vmcb->control.iopm_base_pa  & ~0x0fffULL;
A
Alexander Graf 已提交
3315

J
Joerg Roedel 已提交
3316
	/* cache intercepts */
3317
	svm->nested.intercept_cr         = nested_vmcb->control.intercept_cr;
3318
	svm->nested.intercept_dr         = nested_vmcb->control.intercept_dr;
J
Joerg Roedel 已提交
3319 3320 3321
	svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
	svm->nested.intercept            = nested_vmcb->control.intercept;

3322
	svm_flush_tlb(&svm->vcpu, true);
A
Alexander Graf 已提交
3323 3324 3325 3326 3327 3328
	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;

3329 3330
	if (svm->vcpu.arch.hflags & HF_VINTR_MASK) {
		/* We only want the cr8 intercept bits of the guest */
3331 3332
		clr_cr_intercept(svm, INTERCEPT_CR8_READ);
		clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);
3333 3334
	}

3335
	/* We don't want to see VMMCALLs from a nested guest */
3336
	clr_intercept(svm, INTERCEPT_VMMCALL);
3337

3338
	svm->vmcb->control.virt_ext = nested_vmcb->control.virt_ext;
A
Alexander Graf 已提交
3339 3340 3341 3342 3343 3344
	svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
	svm->vmcb->control.int_state = nested_vmcb->control.int_state;
	svm->vmcb->control.tsc_offset += nested_vmcb->control.tsc_offset;
	svm->vmcb->control.event_inj = nested_vmcb->control.event_inj;
	svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err;

3345
	nested_svm_unmap(page);
3346

3347 3348 3349
	/* Enter Guest-Mode */
	enter_guest_mode(&svm->vcpu);

3350 3351 3352 3353 3354 3355
	/*
	 * Merge guest and host intercepts - must be called  with vcpu in
	 * guest-mode to take affect here
	 */
	recalc_intercepts(svm);

3356
	svm->nested.vmcb = vmcb_gpa;
3357

3358
	enable_gif(svm);
A
Alexander Graf 已提交
3359

3360
	mark_all_dirty(svm->vmcb);
L
Ladi Prosek 已提交
3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427
}

static bool nested_svm_vmrun(struct vcpu_svm *svm)
{
	struct vmcb *nested_vmcb;
	struct vmcb *hsave = svm->nested.hsave;
	struct vmcb *vmcb = svm->vmcb;
	struct page *page;
	u64 vmcb_gpa;

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

	nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
	if (!nested_vmcb)
		return false;

	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;

		nested_svm_unmap(page);

		return false;
	}

	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);

	enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb, page);
3428

3429
	return true;
A
Alexander Graf 已提交
3430 3431
}

3432
static void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447
{
	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
3448
static int vmload_interception(struct vcpu_svm *svm)
3449
{
3450
	struct vmcb *nested_vmcb;
3451
	struct page *page;
3452
	int ret;
3453

3454 3455 3456
	if (nested_svm_check_permissions(svm))
		return 1;

3457
	nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
3458 3459 3460
	if (!nested_vmcb)
		return 1;

3461
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3462
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3463

3464
	nested_svm_vmloadsave(nested_vmcb, svm->vmcb);
3465
	nested_svm_unmap(page);
3466

3467
	return ret;
3468 3469
}

A
Avi Kivity 已提交
3470
static int vmsave_interception(struct vcpu_svm *svm)
3471
{
3472
	struct vmcb *nested_vmcb;
3473
	struct page *page;
3474
	int ret;
3475

3476 3477 3478
	if (nested_svm_check_permissions(svm))
		return 1;

3479
	nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
3480 3481 3482
	if (!nested_vmcb)
		return 1;

3483
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3484
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3485

3486
	nested_svm_vmloadsave(svm->vmcb, nested_vmcb);
3487
	nested_svm_unmap(page);
3488

3489
	return ret;
3490 3491
}

A
Avi Kivity 已提交
3492
static int vmrun_interception(struct vcpu_svm *svm)
A
Alexander Graf 已提交
3493 3494 3495 3496
{
	if (nested_svm_check_permissions(svm))
		return 1;

3497 3498
	/* Save rip after vmrun instruction */
	kvm_rip_write(&svm->vcpu, kvm_rip_read(&svm->vcpu) + 3);
A
Alexander Graf 已提交
3499

3500
	if (!nested_svm_vmrun(svm))
A
Alexander Graf 已提交
3501 3502
		return 1;

3503
	if (!nested_svm_vmrun_msrpm(svm))
3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515
		goto failed;

	return 1;

failed:

	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);
A
Alexander Graf 已提交
3516 3517 3518 3519

	return 1;
}

A
Avi Kivity 已提交
3520
static int stgi_interception(struct vcpu_svm *svm)
3521
{
3522 3523
	int ret;

3524 3525 3526
	if (nested_svm_check_permissions(svm))
		return 1;

3527 3528
	/*
	 * If VGIF is enabled, the STGI intercept is only added to
3529
	 * detect the opening of the SMI/NMI window; remove it now.
3530 3531 3532 3533
	 */
	if (vgif_enabled(svm))
		clr_intercept(svm, INTERCEPT_STGI);

3534
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3535
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3536
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3537

3538
	enable_gif(svm);
3539

3540
	return ret;
3541 3542
}

A
Avi Kivity 已提交
3543
static int clgi_interception(struct vcpu_svm *svm)
3544
{
3545 3546
	int ret;

3547 3548 3549 3550
	if (nested_svm_check_permissions(svm))
		return 1;

	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3551
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3552

3553
	disable_gif(svm);
3554 3555

	/* After a CLGI no interrupts should come */
3556 3557 3558 3559 3560
	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);
	}
3561

3562
	return ret;
3563 3564
}

A
Avi Kivity 已提交
3565
static int invlpga_interception(struct vcpu_svm *svm)
A
Alexander Graf 已提交
3566 3567 3568
{
	struct kvm_vcpu *vcpu = &svm->vcpu;

3569 3570
	trace_kvm_invlpga(svm->vmcb->save.rip, kvm_register_read(&svm->vcpu, VCPU_REGS_RCX),
			  kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
3571

A
Alexander Graf 已提交
3572
	/* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
3573
	kvm_mmu_invlpg(vcpu, kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
A
Alexander Graf 已提交
3574 3575

	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3576
	return kvm_skip_emulated_instruction(&svm->vcpu);
A
Alexander Graf 已提交
3577 3578
}

3579 3580
static int skinit_interception(struct vcpu_svm *svm)
{
3581
	trace_kvm_skinit(svm->vmcb->save.rip, kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
3582 3583 3584 3585 3586

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

D
David Kaplan 已提交
3587 3588
static int wbinvd_interception(struct vcpu_svm *svm)
{
3589
	return kvm_emulate_wbinvd(&svm->vcpu);
D
David Kaplan 已提交
3590 3591
}

J
Joerg Roedel 已提交
3592 3593 3594 3595 3596 3597 3598
static int xsetbv_interception(struct vcpu_svm *svm)
{
	u64 new_bv = kvm_read_edx_eax(&svm->vcpu);
	u32 index = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);

	if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) {
		svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3599
		return kvm_skip_emulated_instruction(&svm->vcpu);
J
Joerg Roedel 已提交
3600 3601 3602 3603 3604
	}

	return 1;
}

A
Avi Kivity 已提交
3605
static int task_switch_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3606
{
3607
	u16 tss_selector;
3608 3609 3610
	int reason;
	int int_type = svm->vmcb->control.exit_int_info &
		SVM_EXITINTINFO_TYPE_MASK;
3611
	int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
3612 3613 3614 3615
	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;
3616 3617
	bool has_error_code = false;
	u32 error_code = 0;
3618 3619

	tss_selector = (u16)svm->vmcb->control.exit_info_1;
3620

3621 3622
	if (svm->vmcb->control.exit_info_2 &
	    (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
3623 3624 3625 3626
		reason = TASK_SWITCH_IRET;
	else if (svm->vmcb->control.exit_info_2 &
		 (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
		reason = TASK_SWITCH_JMP;
3627
	else if (idt_v)
3628 3629 3630 3631
		reason = TASK_SWITCH_GATE;
	else
		reason = TASK_SWITCH_CALL;

3632 3633 3634 3635 3636 3637
	if (reason == TASK_SWITCH_GATE) {
		switch (type) {
		case SVM_EXITINTINFO_TYPE_NMI:
			svm->vcpu.arch.nmi_injected = false;
			break;
		case SVM_EXITINTINFO_TYPE_EXEPT:
3638 3639 3640 3641 3642 3643
			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;
			}
3644 3645 3646 3647 3648 3649 3650 3651 3652
			kvm_clear_exception_queue(&svm->vcpu);
			break;
		case SVM_EXITINTINFO_TYPE_INTR:
			kvm_clear_interrupt_queue(&svm->vcpu);
			break;
		default:
			break;
		}
	}
3653

3654 3655 3656
	if (reason != TASK_SWITCH_GATE ||
	    int_type == SVM_EXITINTINFO_TYPE_SOFT ||
	    (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
3657 3658
	     (int_vec == OF_VECTOR || int_vec == BP_VECTOR)))
		skip_emulated_instruction(&svm->vcpu);
3659

3660 3661 3662 3663
	if (int_type != SVM_EXITINTINFO_TYPE_SOFT)
		int_vec = -1;

	if (kvm_task_switch(&svm->vcpu, tss_selector, int_vec, reason,
3664 3665 3666 3667 3668 3669 3670
				has_error_code, error_code) == EMULATE_FAIL) {
		svm->vcpu.run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
		svm->vcpu.run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
		svm->vcpu.run->internal.ndata = 0;
		return 0;
	}
	return 1;
A
Avi Kivity 已提交
3671 3672
}

A
Avi Kivity 已提交
3673
static int cpuid_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3674
{
3675
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
3676
	return kvm_emulate_cpuid(&svm->vcpu);
A
Avi Kivity 已提交
3677 3678
}

A
Avi Kivity 已提交
3679
static int iret_interception(struct vcpu_svm *svm)
3680 3681
{
	++svm->vcpu.stat.nmi_window_exits;
3682
	clr_intercept(svm, INTERCEPT_IRET);
3683
	svm->vcpu.arch.hflags |= HF_IRET_MASK;
3684
	svm->nmi_iret_rip = kvm_rip_read(&svm->vcpu);
3685
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3686 3687 3688
	return 1;
}

A
Avi Kivity 已提交
3689
static int invlpg_interception(struct vcpu_svm *svm)
M
Marcelo Tosatti 已提交
3690
{
3691 3692 3693 3694
	if (!static_cpu_has(X86_FEATURE_DECODEASSISTS))
		return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;

	kvm_mmu_invlpg(&svm->vcpu, svm->vmcb->control.exit_info_1);
3695
	return kvm_skip_emulated_instruction(&svm->vcpu);
M
Marcelo Tosatti 已提交
3696 3697
}

A
Avi Kivity 已提交
3698
static int emulate_on_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3699
{
3700
	return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;
A
Avi Kivity 已提交
3701 3702
}

A
Avi Kivity 已提交
3703 3704 3705 3706 3707 3708 3709 3710
static int rdpmc_interception(struct vcpu_svm *svm)
{
	int err;

	if (!static_cpu_has(X86_FEATURE_NRIPS))
		return emulate_on_interception(svm);

	err = kvm_rdpmc(&svm->vcpu);
3711
	return kvm_complete_insn_gp(&svm->vcpu, err);
A
Avi Kivity 已提交
3712 3713
}

3714 3715
static bool check_selective_cr0_intercepted(struct vcpu_svm *svm,
					    unsigned long val)
3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737
{
	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;
}

3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752
#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;
3753 3754 3755 3756
	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;
3757 3758 3759 3760 3761 3762 3763

	err = 0;
	if (cr >= 16) { /* mov to cr */
		cr -= 16;
		val = kvm_register_read(&svm->vcpu, reg);
		switch (cr) {
		case 0:
3764 3765
			if (!check_selective_cr0_intercepted(svm, val))
				err = kvm_set_cr0(&svm->vcpu, val);
3766 3767 3768
			else
				return 1;

3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792
			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:
3793
			val = kvm_read_cr3(&svm->vcpu);
3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807
			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);
	}
3808
	return kvm_complete_insn_gp(&svm->vcpu, err);
3809 3810
}

3811 3812 3813 3814 3815
static int dr_interception(struct vcpu_svm *svm)
{
	int reg, dr;
	unsigned long val;

3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826
	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;
	}

3827 3828 3829 3830 3831 3832 3833
	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 */
3834 3835
		if (!kvm_require_dr(&svm->vcpu, dr - 16))
			return 1;
3836 3837 3838
		val = kvm_register_read(&svm->vcpu, reg);
		kvm_set_dr(&svm->vcpu, dr - 16, val);
	} else {
3839 3840 3841 3842
		if (!kvm_require_dr(&svm->vcpu, dr))
			return 1;
		kvm_get_dr(&svm->vcpu, dr, &val);
		kvm_register_write(&svm->vcpu, reg, val);
3843 3844
	}

3845
	return kvm_skip_emulated_instruction(&svm->vcpu);
3846 3847
}

A
Avi Kivity 已提交
3848
static int cr8_write_interception(struct vcpu_svm *svm)
3849
{
A
Avi Kivity 已提交
3850
	struct kvm_run *kvm_run = svm->vcpu.run;
A
Andre Przywara 已提交
3851
	int r;
A
Avi Kivity 已提交
3852

3853 3854
	u8 cr8_prev = kvm_get_cr8(&svm->vcpu);
	/* instruction emulation calls kvm_set_cr8() */
3855
	r = cr_interception(svm);
3856
	if (lapic_in_kernel(&svm->vcpu))
3857
		return r;
3858
	if (cr8_prev <= kvm_get_cr8(&svm->vcpu))
3859
		return r;
3860 3861 3862 3863
	kvm_run->exit_reason = KVM_EXIT_SET_TPR;
	return 0;
}

3864
static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
A
Avi Kivity 已提交
3865
{
3866 3867
	struct vcpu_svm *svm = to_svm(vcpu);

3868
	switch (msr_info->index) {
3869
	case MSR_IA32_TSC: {
3870
		msr_info->data = svm->vmcb->control.tsc_offset +
3871
			kvm_scale_tsc(vcpu, rdtsc());
3872

A
Avi Kivity 已提交
3873 3874
		break;
	}
B
Brian Gerst 已提交
3875
	case MSR_STAR:
3876
		msr_info->data = svm->vmcb->save.star;
A
Avi Kivity 已提交
3877
		break;
3878
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
3879
	case MSR_LSTAR:
3880
		msr_info->data = svm->vmcb->save.lstar;
A
Avi Kivity 已提交
3881 3882
		break;
	case MSR_CSTAR:
3883
		msr_info->data = svm->vmcb->save.cstar;
A
Avi Kivity 已提交
3884 3885
		break;
	case MSR_KERNEL_GS_BASE:
3886
		msr_info->data = svm->vmcb->save.kernel_gs_base;
A
Avi Kivity 已提交
3887 3888
		break;
	case MSR_SYSCALL_MASK:
3889
		msr_info->data = svm->vmcb->save.sfmask;
A
Avi Kivity 已提交
3890 3891 3892
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
3893
		msr_info->data = svm->vmcb->save.sysenter_cs;
A
Avi Kivity 已提交
3894 3895
		break;
	case MSR_IA32_SYSENTER_EIP:
3896
		msr_info->data = svm->sysenter_eip;
A
Avi Kivity 已提交
3897 3898
		break;
	case MSR_IA32_SYSENTER_ESP:
3899
		msr_info->data = svm->sysenter_esp;
A
Avi Kivity 已提交
3900
		break;
P
Paolo Bonzini 已提交
3901 3902 3903 3904 3905
	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
3906 3907 3908 3909 3910
	/*
	 * 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.
	 */
3911
	case MSR_IA32_DEBUGCTLMSR:
3912
		msr_info->data = svm->vmcb->save.dbgctl;
3913 3914
		break;
	case MSR_IA32_LASTBRANCHFROMIP:
3915
		msr_info->data = svm->vmcb->save.br_from;
3916 3917
		break;
	case MSR_IA32_LASTBRANCHTOIP:
3918
		msr_info->data = svm->vmcb->save.br_to;
3919 3920
		break;
	case MSR_IA32_LASTINTFROMIP:
3921
		msr_info->data = svm->vmcb->save.last_excp_from;
3922 3923
		break;
	case MSR_IA32_LASTINTTOIP:
3924
		msr_info->data = svm->vmcb->save.last_excp_to;
3925
		break;
A
Alexander Graf 已提交
3926
	case MSR_VM_HSAVE_PA:
3927
		msr_info->data = svm->nested.hsave_msr;
A
Alexander Graf 已提交
3928
		break;
3929
	case MSR_VM_CR:
3930
		msr_info->data = svm->nested.vm_cr_msr;
3931
		break;
3932 3933 3934 3935 3936 3937 3938
	case MSR_IA32_SPEC_CTRL:
		if (!msr_info->host_initiated &&
		    !guest_cpuid_has(vcpu, X86_FEATURE_IBRS))
			return 1;

		msr_info->data = svm->spec_ctrl;
		break;
3939
	case MSR_IA32_UCODE_REV:
3940
		msr_info->data = 0x01000065;
3941
		break;
3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958
	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;
A
Avi Kivity 已提交
3959
	default:
3960
		return kvm_get_msr_common(vcpu, msr_info);
A
Avi Kivity 已提交
3961 3962 3963 3964
	}
	return 0;
}

A
Avi Kivity 已提交
3965
static int rdmsr_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3966
{
3967
	u32 ecx = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);
3968
	struct msr_data msr_info;
A
Avi Kivity 已提交
3969

3970 3971 3972
	msr_info.index = ecx;
	msr_info.host_initiated = false;
	if (svm_get_msr(&svm->vcpu, &msr_info)) {
3973
		trace_kvm_msr_read_ex(ecx);
3974
		kvm_inject_gp(&svm->vcpu, 0);
3975
		return 1;
3976
	} else {
3977
		trace_kvm_msr_read(ecx, msr_info.data);
3978

3979 3980 3981 3982
		kvm_register_write(&svm->vcpu, VCPU_REGS_RAX,
				   msr_info.data & 0xffffffff);
		kvm_register_write(&svm->vcpu, VCPU_REGS_RDX,
				   msr_info.data >> 32);
3983
		svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
3984
		return kvm_skip_emulated_instruction(&svm->vcpu);
A
Avi Kivity 已提交
3985 3986 3987
	}
}

3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012
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;
}

4013
static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
A
Avi Kivity 已提交
4014
{
4015 4016
	struct vcpu_svm *svm = to_svm(vcpu);

4017 4018
	u32 ecx = msr->index;
	u64 data = msr->data;
A
Avi Kivity 已提交
4019
	switch (ecx) {
P
Paolo Bonzini 已提交
4020 4021 4022 4023 4024 4025 4026
	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;
4027
	case MSR_IA32_TSC:
4028
		kvm_write_tsc(vcpu, msr);
A
Avi Kivity 已提交
4029
		break;
4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056
	case MSR_IA32_SPEC_CTRL:
		if (!msr->host_initiated &&
		    !guest_cpuid_has(vcpu, X86_FEATURE_IBRS))
			return 1;

		/* The STIBP bit doesn't fault even if it's not advertised */
		if (data & ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP))
			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
4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072
	case MSR_IA32_PRED_CMD:
		if (!msr->host_initiated &&
		    !guest_cpuid_has(vcpu, X86_FEATURE_IBPB))
			return 1;

		if (data & ~PRED_CMD_IBPB)
			return 1;

		if (!data)
			break;

		wrmsrl(MSR_IA32_PRED_CMD, PRED_CMD_IBPB);
		if (is_guest_mode(vcpu))
			break;
		set_msr_interception(svm->msrpm, MSR_IA32_PRED_CMD, 0, 1);
		break;
B
Brian Gerst 已提交
4073
	case MSR_STAR:
4074
		svm->vmcb->save.star = data;
A
Avi Kivity 已提交
4075
		break;
4076
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
4077
	case MSR_LSTAR:
4078
		svm->vmcb->save.lstar = data;
A
Avi Kivity 已提交
4079 4080
		break;
	case MSR_CSTAR:
4081
		svm->vmcb->save.cstar = data;
A
Avi Kivity 已提交
4082 4083
		break;
	case MSR_KERNEL_GS_BASE:
4084
		svm->vmcb->save.kernel_gs_base = data;
A
Avi Kivity 已提交
4085 4086
		break;
	case MSR_SYSCALL_MASK:
4087
		svm->vmcb->save.sfmask = data;
A
Avi Kivity 已提交
4088 4089 4090
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
4091
		svm->vmcb->save.sysenter_cs = data;
A
Avi Kivity 已提交
4092 4093
		break;
	case MSR_IA32_SYSENTER_EIP:
4094
		svm->sysenter_eip = data;
4095
		svm->vmcb->save.sysenter_eip = data;
A
Avi Kivity 已提交
4096 4097
		break;
	case MSR_IA32_SYSENTER_ESP:
4098
		svm->sysenter_esp = data;
4099
		svm->vmcb->save.sysenter_esp = data;
A
Avi Kivity 已提交
4100
		break;
P
Paolo Bonzini 已提交
4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112
	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;
4113
	case MSR_IA32_DEBUGCTLMSR:
4114
		if (!boot_cpu_has(X86_FEATURE_LBRV)) {
4115 4116
			vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
				    __func__, data);
4117 4118 4119 4120 4121 4122
			break;
		}
		if (data & DEBUGCTL_RESERVED_BITS)
			return 1;

		svm->vmcb->save.dbgctl = data;
4123
		mark_dirty(svm->vmcb, VMCB_LBR);
4124 4125 4126 4127
		if (data & (1ULL<<0))
			svm_enable_lbrv(svm);
		else
			svm_disable_lbrv(svm);
4128
		break;
A
Alexander Graf 已提交
4129
	case MSR_VM_HSAVE_PA:
4130
		svm->nested.hsave_msr = data;
4131
		break;
4132
	case MSR_VM_CR:
4133
		return svm_set_vm_cr(vcpu, data);
4134
	case MSR_VM_IGNNE:
4135
		vcpu_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
4136
		break;
4137 4138 4139 4140
	case MSR_IA32_APICBASE:
		if (kvm_vcpu_apicv_active(vcpu))
			avic_update_vapic_bar(to_svm(vcpu), data);
		/* Follow through */
A
Avi Kivity 已提交
4141
	default:
4142
		return kvm_set_msr_common(vcpu, msr);
A
Avi Kivity 已提交
4143 4144 4145 4146
	}
	return 0;
}

A
Avi Kivity 已提交
4147
static int wrmsr_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
4148
{
4149
	struct msr_data msr;
4150 4151
	u32 ecx = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);
	u64 data = kvm_read_edx_eax(&svm->vcpu);
4152

4153 4154 4155
	msr.data = data;
	msr.index = ecx;
	msr.host_initiated = false;
4156

4157
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
4158
	if (kvm_set_msr(&svm->vcpu, &msr)) {
4159
		trace_kvm_msr_write_ex(ecx, data);
4160
		kvm_inject_gp(&svm->vcpu, 0);
4161
		return 1;
4162 4163
	} else {
		trace_kvm_msr_write(ecx, data);
4164
		return kvm_skip_emulated_instruction(&svm->vcpu);
4165
	}
A
Avi Kivity 已提交
4166 4167
}

A
Avi Kivity 已提交
4168
static int msr_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
4169
{
R
Rusty Russell 已提交
4170
	if (svm->vmcb->control.exit_info_1)
A
Avi Kivity 已提交
4171
		return wrmsr_interception(svm);
A
Avi Kivity 已提交
4172
	else
A
Avi Kivity 已提交
4173
		return rdmsr_interception(svm);
A
Avi Kivity 已提交
4174 4175
}

A
Avi Kivity 已提交
4176
static int interrupt_window_interception(struct vcpu_svm *svm)
4177
{
4178
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
4179
	svm_clear_vintr(svm);
4180
	svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
4181
	mark_dirty(svm->vmcb, VMCB_INTR);
4182
	++svm->vcpu.stat.irq_window_exits;
4183 4184 4185
	return 1;
}

4186 4187
static int pause_interception(struct vcpu_svm *svm)
{
4188 4189 4190 4191
	struct kvm_vcpu *vcpu = &svm->vcpu;
	bool in_kernel = (svm_get_cpl(vcpu) == 0);

	kvm_vcpu_on_spin(vcpu, in_kernel);
4192 4193 4194
	return 1;
}

4195 4196
static int nop_interception(struct vcpu_svm *svm)
{
4197
	return kvm_skip_emulated_instruction(&(svm->vcpu));
4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211
}

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);
}

4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223
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
4224
	u32 index = svm->vmcb->control.exit_info_2 & 0xFF;
4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 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 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483
	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: {
		int i;
		struct kvm_vcpu *vcpu;
		struct kvm *kvm = svm->vcpu.kvm;
		struct kvm_lapic *apic = svm->vcpu.arch.apic;

		/*
		 * 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.
		 */
		kvm_for_each_vcpu(i, vcpu, kvm) {
			bool m = kvm_apic_match_dest(vcpu, apic,
						     icrl & KVM_APIC_SHORT_MASK,
						     GET_APIC_DEST_FIELD(icrh),
						     icrl & KVM_APIC_DEST_MASK);

			if (m && !avic_vcpu_is_running(vcpu))
				kvm_vcpu_wake_up(vcpu);
		}
		break;
	}
	case AVIC_IPI_FAILURE_INVALID_TARGET:
		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)
{
	struct kvm_arch *vm_data = &vcpu->kvm->arch;
	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;
	}

	logical_apic_id_table = (u32 *) page_address(vm_data->avic_logical_id_table_page);

	return &logical_apic_id_table[index];
}

static int avic_ldr_write(struct kvm_vcpu *vcpu, u8 g_physical_id, u32 ldr,
			  bool valid)
{
	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);
	if (valid)
		new_entry |= AVIC_LOGICAL_ID_ENTRY_VALID_MASK;
	else
		new_entry &= ~AVIC_LOGICAL_ID_ENTRY_VALID_MASK;
	WRITE_ONCE(*entry, new_entry);

	return 0;
}

static int avic_handle_ldr_update(struct kvm_vcpu *vcpu)
{
	int ret;
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 ldr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_LDR);

	if (!ldr)
		return 1;

	ret = avic_ldr_write(vcpu, vcpu->vcpu_id, ldr, true);
	if (ret && svm->ldr_reg) {
		avic_ldr_write(vcpu, 0, svm->ldr_reg, false);
		svm->ldr_reg = 0;
	} else {
		svm->ldr_reg = ldr;
	}
	return ret;
}

static int avic_handle_apic_id_update(struct kvm_vcpu *vcpu)
{
	u64 *old, *new;
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 apic_id_reg = kvm_lapic_get_reg(vcpu->arch.apic, APIC_ID);
	u32 id = (apic_id_reg >> 24) & 0xff;

	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;
}

static int avic_handle_dfr_update(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct kvm_arch *vm_data = &vcpu->kvm->arch;
	u32 dfr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_DFR);
	u32 mod = (dfr >> 28) & 0xf;

	/*
	 * We assume that all local APICs are using the same type.
	 * If this changes, we need to flush the AVIC logical
	 * APID id table.
	 */
	if (vm_data->ldr_mode == mod)
		return 0;

	clear_page(page_address(vm_data->avic_logical_id_table_page));
	vm_data->ldr_mode = mod;

	if (svm->ldr_reg)
		avic_handle_ldr_update(vcpu);
	return 0;
}

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 */
		ret = (emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE);
	}

	return ret;
}

4484
static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
4485 4486 4487 4488
	[SVM_EXIT_READ_CR0]			= cr_interception,
	[SVM_EXIT_READ_CR3]			= cr_interception,
	[SVM_EXIT_READ_CR4]			= cr_interception,
	[SVM_EXIT_READ_CR8]			= cr_interception,
4489
	[SVM_EXIT_CR0_SEL_WRITE]		= cr_interception,
4490
	[SVM_EXIT_WRITE_CR0]			= cr_interception,
4491 4492
	[SVM_EXIT_WRITE_CR3]			= cr_interception,
	[SVM_EXIT_WRITE_CR4]			= cr_interception,
J
Joerg Roedel 已提交
4493
	[SVM_EXIT_WRITE_CR8]			= cr8_write_interception,
4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509
	[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
4510 4511
	[SVM_EXIT_EXCP_BASE + DB_VECTOR]	= db_interception,
	[SVM_EXIT_EXCP_BASE + BP_VECTOR]	= bp_interception,
4512
	[SVM_EXIT_EXCP_BASE + UD_VECTOR]	= ud_interception,
J
Joerg Roedel 已提交
4513 4514
	[SVM_EXIT_EXCP_BASE + PF_VECTOR]	= pf_interception,
	[SVM_EXIT_EXCP_BASE + MC_VECTOR]	= mc_interception,
4515
	[SVM_EXIT_EXCP_BASE + AC_VECTOR]	= ac_interception,
J
Joerg Roedel 已提交
4516
	[SVM_EXIT_INTR]				= intr_interception,
4517
	[SVM_EXIT_NMI]				= nmi_interception,
A
Avi Kivity 已提交
4518 4519
	[SVM_EXIT_SMI]				= nop_on_interception,
	[SVM_EXIT_INIT]				= nop_on_interception,
4520
	[SVM_EXIT_VINTR]			= interrupt_window_interception,
A
Avi Kivity 已提交
4521
	[SVM_EXIT_RDPMC]			= rdpmc_interception,
A
Avi Kivity 已提交
4522
	[SVM_EXIT_CPUID]			= cpuid_interception,
4523
	[SVM_EXIT_IRET]                         = iret_interception,
4524
	[SVM_EXIT_INVD]                         = emulate_on_interception,
4525
	[SVM_EXIT_PAUSE]			= pause_interception,
A
Avi Kivity 已提交
4526
	[SVM_EXIT_HLT]				= halt_interception,
M
Marcelo Tosatti 已提交
4527
	[SVM_EXIT_INVLPG]			= invlpg_interception,
A
Alexander Graf 已提交
4528
	[SVM_EXIT_INVLPGA]			= invlpga_interception,
J
Joerg Roedel 已提交
4529
	[SVM_EXIT_IOIO]				= io_interception,
A
Avi Kivity 已提交
4530 4531
	[SVM_EXIT_MSR]				= msr_interception,
	[SVM_EXIT_TASK_SWITCH]			= task_switch_interception,
4532
	[SVM_EXIT_SHUTDOWN]			= shutdown_interception,
A
Alexander Graf 已提交
4533
	[SVM_EXIT_VMRUN]			= vmrun_interception,
4534
	[SVM_EXIT_VMMCALL]			= vmmcall_interception,
4535 4536
	[SVM_EXIT_VMLOAD]			= vmload_interception,
	[SVM_EXIT_VMSAVE]			= vmsave_interception,
4537 4538
	[SVM_EXIT_STGI]				= stgi_interception,
	[SVM_EXIT_CLGI]				= clgi_interception,
4539
	[SVM_EXIT_SKINIT]			= skinit_interception,
D
David Kaplan 已提交
4540
	[SVM_EXIT_WBINVD]                       = wbinvd_interception,
4541 4542
	[SVM_EXIT_MONITOR]			= monitor_interception,
	[SVM_EXIT_MWAIT]			= mwait_interception,
J
Joerg Roedel 已提交
4543
	[SVM_EXIT_XSETBV]			= xsetbv_interception,
4544
	[SVM_EXIT_NPF]				= npf_interception,
P
Paolo Bonzini 已提交
4545
	[SVM_EXIT_RSM]                          = emulate_on_interception,
4546 4547
	[SVM_EXIT_AVIC_INCOMPLETE_IPI]		= avic_incomplete_ipi_interception,
	[SVM_EXIT_AVIC_UNACCELERATED_ACCESS]	= avic_unaccelerated_access_interception,
A
Avi Kivity 已提交
4548 4549
};

4550
static void dump_vmcb(struct kvm_vcpu *vcpu)
4551 4552 4553 4554 4555 4556
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb_control_area *control = &svm->vmcb->control;
	struct vmcb_save_area *save = &svm->vmcb->save;

	pr_err("VMCB Control Area:\n");
4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578
	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);
	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);
4579
	pr_err("%-20s%016llx\n", "avic_vapic_bar:", control->avic_vapic_bar);
4580 4581
	pr_err("%-20s%08x\n", "event_inj:", control->event_inj);
	pr_err("%-20s%08x\n", "event_inj_err:", control->event_inj_err);
4582
	pr_err("%-20s%lld\n", "virt_ext:", control->virt_ext);
4583
	pr_err("%-20s%016llx\n", "next_rip:", control->next_rip);
4584 4585 4586
	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);
4587
	pr_err("VMCB State Save Area:\n");
4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627
	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);
4628 4629
	pr_err("cpl:            %d                efer:         %016llx\n",
		save->cpl, save->efer);
4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656
	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);
4657 4658
}

4659 4660 4661 4662 4663 4664 4665 4666
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;
}

A
Avi Kivity 已提交
4667
static int handle_exit(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
4668
{
4669
	struct vcpu_svm *svm = to_svm(vcpu);
A
Avi Kivity 已提交
4670
	struct kvm_run *kvm_run = vcpu->run;
4671
	u32 exit_code = svm->vmcb->control.exit_code;
A
Avi Kivity 已提交
4672

4673 4674
	trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);

4675
	if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE))
4676 4677 4678
		vcpu->arch.cr0 = svm->vmcb->save.cr0;
	if (npt_enabled)
		vcpu->arch.cr3 = svm->vmcb->save.cr3;
4679

4680 4681 4682 4683 4684 4685 4686
	if (unlikely(svm->nested.exit_required)) {
		nested_svm_vmexit(svm);
		svm->nested.exit_required = false;

		return 1;
	}

4687
	if (is_guest_mode(vcpu)) {
4688 4689
		int vmexit;

4690 4691 4692 4693
		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,
4694 4695
					svm->vmcb->control.exit_int_info_err,
					KVM_ISA_SVM);
4696

4697 4698 4699 4700 4701 4702
		vmexit = nested_svm_exit_special(svm);

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

		if (vmexit == NESTED_EXIT_DONE)
4703 4704 4705
			return 1;
	}

4706 4707
	svm_complete_interrupts(svm);

4708 4709 4710 4711
	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;
4712 4713
		pr_err("KVM: FAILED VMRUN WITH VMCB:\n");
		dump_vmcb(vcpu);
4714 4715 4716
		return 0;
	}

4717
	if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
4718
	    exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
4719 4720
	    exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
	    exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
4721
		printk(KERN_ERR "%s: unexpected exit_int_info 0x%x "
A
Avi Kivity 已提交
4722
		       "exit_code 0x%x\n",
4723
		       __func__, svm->vmcb->control.exit_int_info,
A
Avi Kivity 已提交
4724 4725
		       exit_code);

4726
	if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
J
Joe Perches 已提交
4727
	    || !svm_exit_handlers[exit_code]) {
4728
		WARN_ONCE(1, "svm: unexpected exit reason 0x%x\n", exit_code);
4729 4730
		kvm_queue_exception(vcpu, UD_VECTOR);
		return 1;
A
Avi Kivity 已提交
4731 4732
	}

A
Avi Kivity 已提交
4733
	return svm_exit_handlers[exit_code](svm);
A
Avi Kivity 已提交
4734 4735 4736 4737 4738 4739
}

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

4740 4741
	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
4742 4743 4744
	load_TR_desc();
}

4745 4746 4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768
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
4769
static void pre_svm_run(struct vcpu_svm *svm)
A
Avi Kivity 已提交
4770 4771 4772
{
	int cpu = raw_smp_processor_id();

4773
	struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
A
Avi Kivity 已提交
4774

4775 4776 4777
	if (sev_guest(svm->vcpu.kvm))
		return pre_sev_run(svm, cpu);

4778
	/* FIXME: handle wraparound of asid_generation */
4779 4780
	if (svm->asid_generation != sd->asid_generation)
		new_asid(svm, sd);
A
Avi Kivity 已提交
4781 4782
}

4783 4784 4785 4786 4787 4788
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;
4789
	set_intercept(svm, INTERCEPT_IRET);
4790 4791
	++vcpu->stat.nmi_injections;
}
A
Avi Kivity 已提交
4792

4793
static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
A
Avi Kivity 已提交
4794 4795 4796
{
	struct vmcb_control_area *control;

4797
	/* The following fields are ignored when AVIC is enabled */
R
Rusty Russell 已提交
4798
	control = &svm->vmcb->control;
4799
	control->int_vector = irq;
A
Avi Kivity 已提交
4800 4801 4802
	control->int_ctl &= ~V_INTR_PRIO_MASK;
	control->int_ctl |= V_IRQ_MASK |
		((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
4803
	mark_dirty(svm->vmcb, VMCB_INTR);
A
Avi Kivity 已提交
4804 4805
}

4806
static void svm_set_irq(struct kvm_vcpu *vcpu)
E
Eddie Dong 已提交
4807 4808 4809
{
	struct vcpu_svm *svm = to_svm(vcpu);

4810
	BUG_ON(!(gif_set(svm)));
4811

4812 4813 4814
	trace_kvm_inj_virq(vcpu->arch.interrupt.nr);
	++vcpu->stat.irq_injections;

4815 4816
	svm->vmcb->control.event_inj = vcpu->arch.interrupt.nr |
		SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
E
Eddie Dong 已提交
4817 4818
}

4819 4820 4821 4822 4823
static inline bool svm_nested_virtualize_tpr(struct kvm_vcpu *vcpu)
{
	return is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK);
}

4824
static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
4825 4826 4827
{
	struct vcpu_svm *svm = to_svm(vcpu);

4828 4829
	if (svm_nested_virtualize_tpr(vcpu) ||
	    kvm_vcpu_apicv_active(vcpu))
4830 4831
		return;

4832 4833
	clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);

4834
	if (irr == -1)
4835 4836
		return;

4837
	if (tpr >= irr)
4838
		set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
4839
}
4840

4841 4842 4843 4844 4845
static void svm_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
{
	return;
}

4846
static bool svm_get_enable_apicv(struct kvm_vcpu *vcpu)
4847
{
4848
	return avic && irqchip_split(vcpu->kvm);
4849 4850 4851 4852
}

static void svm_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr)
{
4853 4854
}

4855
static void svm_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr)
4856
{
4857 4858
}

4859
/* Note: Currently only used by Hyper-V. */
4860
static void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
4861
{
4862 4863 4864
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb;

4865
	if (!kvm_vcpu_apicv_active(&svm->vcpu))
4866 4867 4868 4869
		return;

	vmcb->control.int_ctl &= ~AVIC_ENABLE_MASK;
	mark_dirty(vmcb, VMCB_INTR);
4870 4871
}

4872
static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
4873 4874 4875 4876
{
	return;
}

4877 4878 4879 4880 4881 4882 4883
static void svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec)
{
	kvm_lapic_set_irr(vec, vcpu->arch.apic);
	smp_mb__after_atomic();

	if (avic_vcpu_is_running(vcpu))
		wrmsrl(SVM_AVIC_DOORBELL,
4884
		       kvm_cpu_get_apicid(vcpu->cpu));
4885 4886 4887 4888
	else
		kvm_vcpu_wake_up(vcpu);
}

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 4922 4923 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 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977
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.
	 */
	ir = kzalloc(sizeof(struct amd_svm_iommu_ir), GFP_KERNEL);
	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);

	if (!kvm_intr_is_single_vcpu(kvm, &irq, &vcpu)) {
		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);
4978
	vcpu_info->pi_desc_addr = __sme_set(page_to_phys((*svm)->avic_backing_page));
4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028
	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.
		 */
		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 */
5029 5030
			pi.base = __sme_set(page_to_phys(svm->avic_backing_page) &
					    AVIC_HPA_MASK);
5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092
			pi.ga_tag = AVIC_GATAG(kvm->arch.avic_vm_id,
						     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) {
			trace_kvm_pi_irte_update(svm->vcpu.vcpu_id,
						 host_irq, e->gsi,
						 vcpu_info.vector,
						 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;
}

5093 5094 5095 5096
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
5097 5098 5099 5100 5101 5102
	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;
5103 5104
}

J
Jan Kiszka 已提交
5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117
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;
5118
		set_intercept(svm, INTERCEPT_IRET);
J
Jan Kiszka 已提交
5119 5120
	} else {
		svm->vcpu.arch.hflags &= ~HF_NMI_MASK;
5121
		clr_intercept(svm, INTERCEPT_IRET);
J
Jan Kiszka 已提交
5122 5123 5124
	}
}

5125 5126 5127 5128
static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb;
5129 5130 5131 5132 5133 5134
	int ret;

	if (!gif_set(svm) ||
	     (vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK))
		return 0;

5135
	ret = !!(kvm_get_rflags(vcpu) & X86_EFLAGS_IF);
5136

5137
	if (is_guest_mode(vcpu))
5138 5139 5140
		return ret && !(svm->vcpu.arch.hflags & HF_VINTR_MASK);

	return ret;
5141 5142
}

5143
static void enable_irq_window(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
5144
{
5145 5146
	struct vcpu_svm *svm = to_svm(vcpu);

5147 5148 5149
	if (kvm_vcpu_apicv_active(vcpu))
		return;

J
Joerg Roedel 已提交
5150 5151 5152 5153
	/*
	 * 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
5154 5155 5156
	 * 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
5157
	 */
5158
	if ((vgif_enabled(svm) || gif_set(svm)) && nested_svm_intr(svm)) {
5159 5160 5161
		svm_set_vintr(svm);
		svm_inject_irq(svm, 0x0);
	}
5162 5163
}

5164
static void enable_nmi_window(struct kvm_vcpu *vcpu)
5165
{
5166
	struct vcpu_svm *svm = to_svm(vcpu);
5167

5168 5169
	if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
	    == HF_NMI_MASK)
5170
		return; /* IRET will cause a vm exit */
5171

5172 5173 5174
	if (!gif_set(svm)) {
		if (vgif_enabled(svm))
			set_intercept(svm, INTERCEPT_STGI);
5175
		return; /* STGI will cause a vm exit */
5176
	}
5177 5178 5179 5180

	if (svm->nested.exit_required)
		return; /* we're not going to run the guest yet */

J
Joerg Roedel 已提交
5181 5182 5183 5184
	/*
	 * Something prevents NMI from been injected. Single step over possible
	 * problem (IRET or exception injection or interrupt shadow)
	 */
5185
	svm->nmi_singlestep_guest_rflags = svm_get_rflags(vcpu);
J
Jan Kiszka 已提交
5186
	svm->nmi_singlestep = true;
5187
	svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
5188 5189
}

5190 5191 5192 5193 5194
static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
{
	return 0;
}

5195
static void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa)
5196
{
5197 5198 5199 5200 5201 5202
	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--;
5203 5204
}

5205 5206 5207 5208
static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
{
}

5209 5210 5211 5212
static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

5213
	if (svm_nested_virtualize_tpr(vcpu))
5214 5215
		return;

5216
	if (!is_cr_intercept(svm, INTERCEPT_CR8_WRITE)) {
5217
		int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
5218
		kvm_set_cr8(vcpu, cr8);
5219 5220 5221
	}
}

5222 5223 5224 5225 5226
static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 cr8;

5227 5228
	if (svm_nested_virtualize_tpr(vcpu) ||
	    kvm_vcpu_apicv_active(vcpu))
5229 5230
		return;

5231 5232 5233 5234 5235
	cr8 = kvm_get_cr8(vcpu);
	svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
	svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
}

5236 5237 5238 5239 5240
static void svm_complete_interrupts(struct vcpu_svm *svm)
{
	u8 vector;
	int type;
	u32 exitintinfo = svm->vmcb->control.exit_int_info;
5241 5242 5243
	unsigned int3_injected = svm->int3_injected;

	svm->int3_injected = 0;
5244

5245 5246 5247 5248 5249 5250
	/*
	 * 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) {
5251
		svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
5252 5253
		kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
	}
5254

5255 5256 5257 5258 5259 5260 5261
	svm->vcpu.arch.nmi_injected = false;
	kvm_clear_exception_queue(&svm->vcpu);
	kvm_clear_interrupt_queue(&svm->vcpu);

	if (!(exitintinfo & SVM_EXITINTINFO_VALID))
		return;

5262 5263
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);

5264 5265 5266 5267 5268 5269 5270 5271
	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:
5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282
		/*
		 * 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);
5283
			break;
5284
		}
5285 5286
		if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
			u32 err = svm->vmcb->control.exit_int_info_err;
5287
			kvm_requeue_exception_e(&svm->vcpu, vector, err);
5288 5289

		} else
5290
			kvm_requeue_exception(&svm->vcpu, vector);
5291 5292
		break;
	case SVM_EXITINTINFO_TYPE_INTR:
5293
		kvm_queue_interrupt(&svm->vcpu, vector, false);
5294 5295 5296 5297 5298 5299
		break;
	default:
		break;
	}
}

A
Avi Kivity 已提交
5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310
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
Avi Kivity 已提交
5311
static void svm_vcpu_run(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
5312
{
5313
	struct vcpu_svm *svm = to_svm(vcpu);
5314

5315 5316 5317 5318
	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];

5319 5320 5321 5322 5323 5324 5325
	/*
	 * A vmexit emulation is required before the vcpu can be executed
	 * again.
	 */
	if (unlikely(svm->nested.exit_required))
		return;

5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339 5340 5341
	/*
	 * 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
5342
	pre_svm_run(svm);
A
Avi Kivity 已提交
5343

5344 5345
	sync_lapic_to_cr8(vcpu);

5346
	svm->vmcb->save.cr2 = vcpu->arch.cr2;
A
Avi Kivity 已提交
5347

5348 5349 5350
	clgi();

	local_irq_enable();
5351

5352 5353 5354 5355 5356 5357 5358
	/*
	 * 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.
	 */
	if (svm->spec_ctrl)
5359
		native_wrmsrl(MSR_IA32_SPEC_CTRL, svm->spec_ctrl);
5360

A
Avi Kivity 已提交
5361
	asm volatile (
A
Avi Kivity 已提交
5362 5363 5364 5365 5366 5367 5368
		"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"
5369
#ifdef CONFIG_X86_64
R
Rusty Russell 已提交
5370 5371 5372 5373 5374 5375 5376 5377
		"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
5378 5379 5380
#endif

		/* Enter guest mode */
A
Avi Kivity 已提交
5381 5382
		"push %%" _ASM_AX " \n\t"
		"mov %c[vmcb](%[svm]), %%" _ASM_AX " \n\t"
5383 5384 5385
		__ex(SVM_VMLOAD) "\n\t"
		__ex(SVM_VMRUN) "\n\t"
		__ex(SVM_VMSAVE) "\n\t"
A
Avi Kivity 已提交
5386
		"pop %%" _ASM_AX " \n\t"
A
Avi Kivity 已提交
5387 5388

		/* Save guest registers, load host registers */
A
Avi Kivity 已提交
5389 5390 5391 5392 5393 5394
		"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"
5395
#ifdef CONFIG_X86_64
R
Rusty Russell 已提交
5396 5397 5398 5399 5400 5401 5402 5403
		"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"
5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422
#endif
		/*
		* Clear host registers marked as clobbered to prevent
		* speculative use.
		*/
		"xor %%" _ASM_BX ", %%" _ASM_BX " \n\t"
		"xor %%" _ASM_CX ", %%" _ASM_CX " \n\t"
		"xor %%" _ASM_DX ", %%" _ASM_DX " \n\t"
		"xor %%" _ASM_SI ", %%" _ASM_SI " \n\t"
		"xor %%" _ASM_DI ", %%" _ASM_DI " \n\t"
#ifdef CONFIG_X86_64
		"xor %%r8, %%r8 \n\t"
		"xor %%r9, %%r9 \n\t"
		"xor %%r10, %%r10 \n\t"
		"xor %%r11, %%r11 \n\t"
		"xor %%r12, %%r12 \n\t"
		"xor %%r13, %%r13 \n\t"
		"xor %%r14, %%r14 \n\t"
		"xor %%r15, %%r15 \n\t"
A
Avi Kivity 已提交
5423
#endif
A
Avi Kivity 已提交
5424
		"pop %%" _ASM_BP
A
Avi Kivity 已提交
5425
		:
R
Rusty Russell 已提交
5426
		: [svm]"a"(svm),
A
Avi Kivity 已提交
5427
		  [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
5428 5429 5430 5431 5432 5433
		  [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]))
5434
#ifdef CONFIG_X86_64
5435 5436 5437 5438 5439 5440 5441 5442
		  , [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
Avi Kivity 已提交
5443
#endif
5444 5445
		: "cc", "memory"
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
5446
		, "rbx", "rcx", "rdx", "rsi", "rdi"
5447
		, "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
A
Avi Kivity 已提交
5448 5449
#else
		, "ebx", "ecx", "edx", "esi", "edi"
5450 5451
#endif
		);
A
Avi Kivity 已提交
5452

5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468
	/*
	 * 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.
	 */
	if (!msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL))
5469
		svm->spec_ctrl = native_read_msr(MSR_IA32_SPEC_CTRL);
5470 5471

	if (svm->spec_ctrl)
5472
		native_wrmsrl(MSR_IA32_SPEC_CTRL, 0);
5473

5474 5475 5476
	/* Eliminate branch target predictions from guest mode */
	vmexit_fill_RSB();

5477 5478 5479
#ifdef CONFIG_X86_64
	wrmsrl(MSR_GS_BASE, svm->host.gs_base);
#else
5480
	loadsegment(fs, svm->host.fs);
5481 5482 5483
#ifndef CONFIG_X86_32_LAZY_GS
	loadsegment(gs, svm->host.gs);
#endif
5484
#endif
A
Avi Kivity 已提交
5485 5486 5487

	reload_tss(vcpu);

5488 5489
	local_irq_disable();

5490 5491 5492 5493 5494
	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;

5495 5496 5497 5498 5499 5500 5501 5502 5503 5504
	if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
		kvm_before_handle_nmi(&svm->vcpu);

	stgi();

	/* Any pending NMI will happen here */

	if (unlikely(svm->vmcb->control.exit_code == SVM_EXIT_NMI))
		kvm_after_handle_nmi(&svm->vcpu);

5505 5506
	sync_cr8_to_lapic(vcpu);

5507
	svm->next_rip = 0;
5508

5509 5510
	svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;

G
Gleb Natapov 已提交
5511 5512
	/* if exit due to PF check for async PF */
	if (svm->vmcb->control.exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR)
5513
		svm->vcpu.arch.apf.host_apf_reason = kvm_read_and_reset_pf_reason();
G
Gleb Natapov 已提交
5514

A
Avi Kivity 已提交
5515 5516 5517 5518
	if (npt_enabled) {
		vcpu->arch.regs_avail &= ~(1 << VCPU_EXREG_PDPTR);
		vcpu->arch.regs_dirty &= ~(1 << VCPU_EXREG_PDPTR);
	}
5519 5520 5521 5522 5523 5524 5525 5526

	/*
	 * 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);
5527 5528

	mark_all_clean(svm->vmcb);
A
Avi Kivity 已提交
5529
}
5530
STACK_FRAME_NON_STANDARD(svm_vcpu_run);
A
Avi Kivity 已提交
5531 5532 5533

static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
5534 5535
	struct vcpu_svm *svm = to_svm(vcpu);

5536
	svm->vmcb->save.cr3 = __sme_set(root);
5537
	mark_dirty(svm->vmcb, VMCB_CR);
5538
	svm_flush_tlb(vcpu, true);
A
Avi Kivity 已提交
5539 5540
}

5541 5542 5543 5544
static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
	struct vcpu_svm *svm = to_svm(vcpu);

5545
	svm->vmcb->control.nested_cr3 = __sme_set(root);
5546
	mark_dirty(svm->vmcb, VMCB_NPT);
5547 5548

	/* Also sync guest cr3 here in case we live migrate */
5549
	svm->vmcb->save.cr3 = kvm_read_cr3(vcpu);
5550
	mark_dirty(svm->vmcb, VMCB_CR);
5551

5552
	svm_flush_tlb(vcpu, true);
5553 5554
}

A
Avi Kivity 已提交
5555 5556
static int is_disabled(void)
{
5557 5558 5559 5560 5561 5562
	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
5563 5564 5565
	return 0;
}

I
Ingo Molnar 已提交
5566 5567 5568 5569 5570 5571 5572 5573 5574 5575 5576
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;
}

Y
Yang, Sheng 已提交
5577 5578 5579 5580 5581
static void svm_check_processor_compat(void *rtn)
{
	*(int *)rtn = 0;
}

5582 5583 5584 5585 5586
static bool svm_cpu_has_accelerated_tpr(void)
{
	return false;
}

5587 5588 5589 5590 5591
static bool svm_has_high_real_mode_segbase(void)
{
	return true;
}

5592 5593 5594 5595 5596
static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
{
	return 0;
}

5597 5598
static void svm_cpuid_update(struct kvm_vcpu *vcpu)
{
5599 5600 5601
	struct vcpu_svm *svm = to_svm(vcpu);

	/* Update nrips enabled cache */
5602
	svm->nrips_enabled = !!guest_cpuid_has(&svm->vcpu, X86_FEATURE_NRIPS);
5603 5604 5605 5606

	if (!kvm_vcpu_apicv_active(vcpu))
		return;

5607
	guest_cpuid_clear(vcpu, X86_FEATURE_X2APIC);
5608 5609
}

5610 5611
static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
{
5612
	switch (func) {
5613 5614 5615 5616
	case 0x1:
		if (avic)
			entry->ecx &= ~bit(X86_FEATURE_X2APIC);
		break;
5617 5618 5619 5620
	case 0x80000001:
		if (nested)
			entry->ecx |= (1 << 2); /* Set SVM bit */
		break;
5621 5622 5623 5624 5625
	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 */
5626 5627 5628 5629
		entry->edx = 0; /* Per default do not support any
				   additional features */

		/* Support next_rip if host supports it */
5630
		if (boot_cpu_has(X86_FEATURE_NRIPS))
5631
			entry->edx |= SVM_FEATURE_NRIP;
5632

5633 5634 5635 5636
		/* Support NPT for the guest if enabled */
		if (npt_enabled)
			entry->edx |= SVM_FEATURE_NPT;

5637
		break;
5638 5639 5640 5641 5642 5643
	case 0x8000001F:
		/* Support memory encryption cpuid if host supports it */
		if (boot_cpu_has(X86_FEATURE_SEV))
			cpuid(0x8000001f, &entry->eax, &entry->ebx,
				&entry->ecx, &entry->edx);

5644
	}
5645 5646
}

5647
static int svm_get_lpage_level(void)
5648
{
5649
	return PT_PDPE_LEVEL;
5650 5651
}

5652 5653
static bool svm_rdtscp_supported(void)
{
P
Paolo Bonzini 已提交
5654
	return boot_cpu_has(X86_FEATURE_RDTSCP);
5655 5656
}

5657 5658 5659 5660 5661
static bool svm_invpcid_supported(void)
{
	return false;
}

5662 5663 5664 5665 5666
static bool svm_mpx_supported(void)
{
	return false;
}

5667 5668 5669 5670 5671
static bool svm_xsaves_supported(void)
{
	return false;
}

5672 5673 5674 5675 5676
static bool svm_umip_emulated(void)
{
	return false;
}

5677 5678 5679 5680 5681
static bool svm_has_wbinvd_exit(void)
{
	return true;
}

5682
#define PRE_EX(exit)  { .exit_code = (exit), \
5683
			.stage = X86_ICPT_PRE_EXCEPT, }
5684
#define POST_EX(exit) { .exit_code = (exit), \
5685
			.stage = X86_ICPT_POST_EXCEPT, }
5686
#define POST_MEM(exit) { .exit_code = (exit), \
5687
			.stage = X86_ICPT_POST_MEMACCESS, }
5688

5689
static const struct __x86_intercept {
5690 5691 5692 5693 5694 5695 5696 5697
	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),
5698 5699
	[x86_intercept_dr_read]		= POST_EX(SVM_EXIT_READ_DR0),
	[x86_intercept_dr_write]	= POST_EX(SVM_EXIT_WRITE_DR0),
5700 5701 5702 5703 5704 5705 5706 5707
	[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),
5708 5709 5710 5711 5712 5713 5714 5715
	[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),
5716 5717 5718
	[x86_intercept_rdtscp]		= POST_EX(SVM_EXIT_RDTSCP),
	[x86_intercept_monitor]		= POST_MEM(SVM_EXIT_MONITOR),
	[x86_intercept_mwait]		= POST_EX(SVM_EXIT_MWAIT),
5719 5720 5721 5722 5723 5724 5725 5726 5727
	[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),
5728 5729 5730 5731 5732 5733 5734
	[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),
5735 5736 5737 5738
	[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),
5739 5740
};

5741
#undef PRE_EX
5742
#undef POST_EX
5743
#undef POST_MEM
5744

5745 5746 5747 5748
static int svm_check_intercept(struct kvm_vcpu *vcpu,
			       struct x86_instruction_info *info,
			       enum x86_intercept_stage stage)
{
5749 5750 5751 5752 5753 5754 5755 5756 5757 5758
	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];

5759
	if (stage != icpt_info.stage)
5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773
		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;

5774 5775
		if (icpt_info.exit_code != SVM_EXIT_WRITE_CR0 ||
		    info->intercept == x86_intercept_clts)
5776 5777 5778 5779 5780 5781 5782 5783 5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798
			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;
	}
5799 5800 5801 5802
	case SVM_EXIT_READ_DR0:
	case SVM_EXIT_WRITE_DR0:
		icpt_info.exit_code += info->modrm_reg;
		break;
5803 5804 5805 5806 5807 5808
	case SVM_EXIT_MSR:
		if (info->intercept == x86_intercept_wrmsr)
			vmcb->control.exit_info_1 = 1;
		else
			vmcb->control.exit_info_1 = 0;
		break;
5809 5810 5811 5812 5813 5814 5815
	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;
5816
		break;
5817 5818 5819 5820 5821 5822
	case SVM_EXIT_IOIO: {
		u64 exit_info;
		u32 bytes;

		if (info->intercept == x86_intercept_in ||
		    info->intercept == x86_intercept_ins) {
5823 5824
			exit_info = ((info->src_val & 0xffff) << 16) |
				SVM_IOIO_TYPE_MASK;
5825
			bytes = info->dst_bytes;
5826
		} else {
5827
			exit_info = (info->dst_val & 0xffff) << 16;
5828
			bytes = info->src_bytes;
5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848
		}

		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;
	}
5849 5850 5851 5852
	default:
		break;
	}

5853 5854 5855
	/* TODO: Advertise NRIPS to guest hypervisor unconditionally */
	if (static_cpu_has(X86_FEATURE_NRIPS))
		vmcb->control.next_rip  = info->next_rip;
5856 5857 5858 5859 5860 5861 5862 5863
	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;
5864 5865
}

5866 5867 5868
static void svm_handle_external_intr(struct kvm_vcpu *vcpu)
{
	local_irq_enable();
P
Paolo Bonzini 已提交
5869 5870 5871 5872 5873 5874
	/*
	 * We must have an instruction with interrupts enabled, so
	 * the timer interrupt isn't delayed by the interrupt shadow.
	 */
	asm("nop");
	local_irq_disable();
5875 5876
}

5877 5878 5879 5880
static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
{
}

5881 5882 5883 5884 5885 5886 5887 5888 5889
static inline void avic_post_state_restore(struct kvm_vcpu *vcpu)
{
	if (avic_handle_apic_id_update(vcpu) != 0)
		return;
	if (avic_handle_dfr_update(vcpu) != 0)
		return;
	avic_handle_ldr_update(vcpu);
}

5890 5891 5892 5893 5894 5895
static void svm_setup_mce(struct kvm_vcpu *vcpu)
{
	/* [63:9] are reserved. */
	vcpu->arch.mcg_cap &= 0x1ff;
}

5896 5897
static int svm_smi_allowed(struct kvm_vcpu *vcpu)
{
5898 5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910 5911
	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;
	}

5912 5913 5914
	return 1;
}

5915 5916
static int svm_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
{
5917 5918 5919 5920 5921 5922 5923 5924 5925 5926 5927 5928 5929 5930 5931 5932 5933
	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;
	}
5934 5935 5936 5937 5938
	return 0;
}

static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, u64 smbase)
{
5939 5940 5941 5942 5943 5944 5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *nested_vmcb;
	struct page *page;
	struct {
		u64 guest;
		u64 vmcb;
	} svm_state_save;
	int ret;

	ret = kvm_vcpu_read_guest(vcpu, smbase + 0xfed8, &svm_state_save,
				  sizeof(svm_state_save));
	if (ret)
		return ret;

	if (svm_state_save.guest) {
		vcpu->arch.hflags &= ~HF_SMM_MASK;
		nested_vmcb = nested_svm_map(svm, svm_state_save.vmcb, &page);
		if (nested_vmcb)
			enter_svm_guest_mode(svm, svm_state_save.vmcb, nested_vmcb, page);
		else
			ret = 1;
		vcpu->arch.hflags |= HF_SMM_MASK;
	}
	return ret;
5963 5964
}

5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977
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;
}

B
Brijesh Singh 已提交
5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008
static int sev_asid_new(void)
{
	int pos;

	/*
	 * SEV-enabled guest must use asid from min_sev_asid to max_sev_asid.
	 */
	pos = find_next_zero_bit(sev_asid_bitmap, max_sev_asid, min_sev_asid - 1);
	if (pos >= max_sev_asid)
		return -EBUSY;

	set_bit(pos, sev_asid_bitmap);
	return pos + 1;
}

static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	int asid, ret;

	ret = -EBUSY;
	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;
6009
	INIT_LIST_HEAD(&sev->regions_list);
B
Brijesh Singh 已提交
6010 6011 6012 6013 6014 6015 6016 6017

	return 0;

e_free:
	__sev_asid_free(asid);
	return ret;
}

6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042
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;

	wbinvd_on_all_cpus();

	ret = sev_guest_df_flush(error);
	if (ret)
		return ret;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	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;
}

6043
static int __sev_issue_cmd(int fd, int id, void *data, int *error)
6044 6045 6046 6047 6048 6049 6050 6051 6052 6053 6054 6055 6056 6057
{
	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;
}

6058 6059 6060 6061 6062 6063 6064
static int sev_issue_cmd(struct kvm *kvm, int id, void *data, int *error)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;

	return __sev_issue_cmd(sev->fd, id, data, error);
}

6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111
static int sev_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	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;

	start = kzalloc(sizeof(*start), GFP_KERNEL);
	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 */
6112
	ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_LAUNCH_START, start, error);
6113 6114 6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140
	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;
}

6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232 6233 6234 6235 6236 6237
static int get_num_contig_pages(int idx, struct page **inpages,
				unsigned long npages)
{
	unsigned long paddr, next_paddr;
	int i = idx + 1, pages = 1;

	/* 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)
{
	unsigned long vaddr, vaddr_end, next_vaddr, npages, size;
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	struct kvm_sev_launch_update_data params;
	struct sev_data_launch_update_data *data;
	struct page **inpages;
	int i, ret, pages;

	if (!sev_guest(kvm))
		return -ENOTTY;

	if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
		return -EFAULT;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	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;
}

6238 6239 6240 6241 6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258 6259 6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308
static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	struct sev_data_launch_measure *data;
	struct kvm_sev_launch_measure params;
	void *blob = NULL;
	int ret;

	if (!sev_guest(kvm))
		return -ENOTTY;

	if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
		return -EFAULT;

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

	/* User wants to query the blob length */
	if (!params.len)
		goto cmd;

	if (params.uaddr) {
		if (params.len > SEV_FW_BLOB_MAX_SIZE) {
			ret = -EINVAL;
			goto e_free;
		}

		if (!access_ok(VERIFY_WRITE, params.uaddr, params.len)) {
			ret = -EFAULT;
			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) {
		if (copy_to_user((void __user *)(uintptr_t)params.uaddr, blob, params.len))
			ret = -EFAULT;
	}

done:
	params.len = data->len;
	if (copy_to_user((void __user *)(uintptr_t)argp->data, &params, sizeof(params)))
		ret = -EFAULT;
e_free_blob:
	kfree(blob);
e_free:
	kfree(data);
	return ret;
}

6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328
static int sev_launch_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	struct sev_data_launch_finish *data;
	int ret;

	if (!sev_guest(kvm))
		return -ENOTTY;

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

	data->handle = sev->handle;
	ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_FINISH, data, &argp->error);

	kfree(data);
	return ret;
}

6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358
static int sev_guest_status(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	struct kvm_sev_guest_status params;
	struct sev_data_guest_status *data;
	int ret;

	if (!sev_guest(kvm))
		return -ENOTTY;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	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;
}

6359 6360 6361 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 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435
static int __sev_issue_dbg_cmd(struct kvm *kvm, unsigned long src,
			       unsigned long dst, int size,
			       int *error, bool enc)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	struct sev_data_dbg *data;
	int ret;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	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;
}

6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512
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;
}

6513 6514 6515 6516 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 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564
static int sev_dbg_crypt(struct kvm *kvm, struct kvm_sev_cmd *argp, bool dec)
{
	unsigned long vaddr, vaddr_end, next_vaddr;
	unsigned long dst_vaddr, dst_vaddr_end;
	struct page **src_p, **dst_p;
	struct kvm_sev_dbg debug;
	unsigned long n;
	int ret, size;

	if (!sev_guest(kvm))
		return -ENOTTY;

	if (copy_from_user(&debug, (void __user *)(uintptr_t)argp->data, sizeof(debug)))
		return -EFAULT;

	vaddr = debug.src_uaddr;
	size = debug.len;
	vaddr_end = vaddr + size;
	dst_vaddr = debug.dst_uaddr;
	dst_vaddr_end = dst_vaddr + size;

	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);

6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577
		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);
6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592

		sev_unpin_memory(kvm, src_p, 1);
		sev_unpin_memory(kvm, dst_p, 1);

		if (ret)
			goto err;

		next_vaddr = vaddr + len;
		dst_vaddr = dst_vaddr + len;
		size -= len;
	}
err:
	return ret;
}

6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612 6613 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
static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	struct sev_data_launch_secret *data;
	struct kvm_sev_launch_secret params;
	struct page **pages;
	void *blob, *hdr;
	unsigned long n;
	int ret;

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

	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;
	}
	data->trans_address = __psp_pa(blob);
	data->trans_len = params.trans_len;

	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
6658 6659 6660 6661 6662 6663 6664 6665 6666 6667 6668 6669 6670 6671 6672 6673 6674
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;
6675 6676 6677
	case KVM_SEV_LAUNCH_START:
		r = sev_launch_start(kvm, &sev_cmd);
		break;
6678 6679 6680
	case KVM_SEV_LAUNCH_UPDATE_DATA:
		r = sev_launch_update_data(kvm, &sev_cmd);
		break;
6681 6682 6683
	case KVM_SEV_LAUNCH_MEASURE:
		r = sev_launch_measure(kvm, &sev_cmd);
		break;
6684 6685 6686
	case KVM_SEV_LAUNCH_FINISH:
		r = sev_launch_finish(kvm, &sev_cmd);
		break;
6687 6688 6689
	case KVM_SEV_GUEST_STATUS:
		r = sev_guest_status(kvm, &sev_cmd);
		break;
6690 6691 6692
	case KVM_SEV_DBG_DECRYPT:
		r = sev_dbg_crypt(kvm, &sev_cmd, true);
		break;
6693 6694 6695
	case KVM_SEV_DBG_ENCRYPT:
		r = sev_dbg_crypt(kvm, &sev_cmd, false);
		break;
6696 6697 6698
	case KVM_SEV_LAUNCH_SECRET:
		r = sev_launch_secret(kvm, &sev_cmd);
		break;
B
Brijesh Singh 已提交
6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711
	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;
}

6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799
static int svm_register_enc_region(struct kvm *kvm,
				   struct kvm_enc_region *range)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	struct enc_region *region;
	int ret = 0;

	if (!sev_guest(kvm))
		return -ENOTTY;

	region = kzalloc(sizeof(*region), GFP_KERNEL);
	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)
{
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	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;
}

6800
static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
A
Avi Kivity 已提交
6801 6802 6803 6804
	.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
6805
	.check_processor_compatibility = svm_check_processor_compat,
A
Avi Kivity 已提交
6806 6807
	.hardware_enable = svm_hardware_enable,
	.hardware_disable = svm_hardware_disable,
6808
	.cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
6809
	.cpu_has_high_real_mode_segbase = svm_has_high_real_mode_segbase,
A
Avi Kivity 已提交
6810 6811 6812

	.vcpu_create = svm_create_vcpu,
	.vcpu_free = svm_free_vcpu,
6813
	.vcpu_reset = svm_vcpu_reset,
A
Avi Kivity 已提交
6814

6815
	.vm_init = avic_vm_init,
B
Brijesh Singh 已提交
6816
	.vm_destroy = svm_vm_destroy,
6817

6818
	.prepare_guest_switch = svm_prepare_guest_switch,
A
Avi Kivity 已提交
6819 6820
	.vcpu_load = svm_vcpu_load,
	.vcpu_put = svm_vcpu_put,
6821 6822
	.vcpu_blocking = svm_vcpu_blocking,
	.vcpu_unblocking = svm_vcpu_unblocking,
A
Avi Kivity 已提交
6823

6824
	.update_bp_intercept = update_bp_intercept,
A
Avi Kivity 已提交
6825 6826 6827 6828 6829
	.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,
6830
	.get_cpl = svm_get_cpl,
6831
	.get_cs_db_l_bits = kvm_get_cs_db_l_bits,
6832
	.decache_cr0_guest_bits = svm_decache_cr0_guest_bits,
6833
	.decache_cr3 = svm_decache_cr3,
6834
	.decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
A
Avi Kivity 已提交
6835 6836 6837 6838 6839 6840 6841 6842
	.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
6843 6844
	.get_dr6 = svm_get_dr6,
	.set_dr6 = svm_set_dr6,
6845
	.set_dr7 = svm_set_dr7,
6846
	.sync_dirty_debug_regs = svm_sync_dirty_debug_regs,
A
Avi Kivity 已提交
6847
	.cache_reg = svm_cache_reg,
A
Avi Kivity 已提交
6848 6849
	.get_rflags = svm_get_rflags,
	.set_rflags = svm_set_rflags,
6850

A
Avi Kivity 已提交
6851 6852 6853
	.tlb_flush = svm_flush_tlb,

	.run = svm_vcpu_run,
6854
	.handle_exit = handle_exit,
A
Avi Kivity 已提交
6855
	.skip_emulated_instruction = skip_emulated_instruction,
6856 6857
	.set_interrupt_shadow = svm_set_interrupt_shadow,
	.get_interrupt_shadow = svm_get_interrupt_shadow,
I
Ingo Molnar 已提交
6858
	.patch_hypercall = svm_patch_hypercall,
E
Eddie Dong 已提交
6859
	.set_irq = svm_set_irq,
6860
	.set_nmi = svm_inject_nmi,
6861
	.queue_exception = svm_queue_exception,
A
Avi Kivity 已提交
6862
	.cancel_injection = svm_cancel_injection,
6863
	.interrupt_allowed = svm_interrupt_allowed,
6864
	.nmi_allowed = svm_nmi_allowed,
J
Jan Kiszka 已提交
6865 6866
	.get_nmi_mask = svm_get_nmi_mask,
	.set_nmi_mask = svm_set_nmi_mask,
6867 6868 6869
	.enable_nmi_window = enable_nmi_window,
	.enable_irq_window = enable_irq_window,
	.update_cr8_intercept = update_cr8_intercept,
6870
	.set_virtual_x2apic_mode = svm_set_virtual_x2apic_mode,
6871 6872
	.get_enable_apicv = svm_get_enable_apicv,
	.refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl,
6873
	.load_eoi_exitmap = svm_load_eoi_exitmap,
6874 6875
	.hwapic_irr_update = svm_hwapic_irr_update,
	.hwapic_isr_update = svm_hwapic_isr_update,
6876
	.sync_pir_to_irr = kvm_lapic_find_highest_irr,
6877
	.apicv_post_state_restore = avic_post_state_restore,
6878 6879

	.set_tss_addr = svm_set_tss_addr,
6880
	.get_tdp_level = get_npt_level,
6881
	.get_mt_mask = svm_get_mt_mask,
6882

6883 6884
	.get_exit_info = svm_get_exit_info,

6885
	.get_lpage_level = svm_get_lpage_level,
6886 6887

	.cpuid_update = svm_cpuid_update,
6888 6889

	.rdtscp_supported = svm_rdtscp_supported,
6890
	.invpcid_supported = svm_invpcid_supported,
6891
	.mpx_supported = svm_mpx_supported,
6892
	.xsaves_supported = svm_xsaves_supported,
6893
	.umip_emulated = svm_umip_emulated,
6894 6895

	.set_supported_cpuid = svm_set_supported_cpuid,
6896 6897

	.has_wbinvd_exit = svm_has_wbinvd_exit,
6898 6899

	.write_tsc_offset = svm_write_tsc_offset,
6900 6901

	.set_tdp_cr3 = set_tdp_cr3,
6902 6903

	.check_intercept = svm_check_intercept,
6904
	.handle_external_intr = svm_handle_external_intr,
6905 6906

	.sched_in = svm_sched_in,
6907 6908

	.pmu_ops = &amd_pmu_ops,
6909
	.deliver_posted_interrupt = svm_deliver_avic_intr,
6910
	.update_pi_irte = svm_update_pi_irte,
6911
	.setup_mce = svm_setup_mce,
6912

6913
	.smi_allowed = svm_smi_allowed,
6914 6915
	.pre_enter_smm = svm_pre_enter_smm,
	.pre_leave_smm = svm_pre_leave_smm,
6916
	.enable_smi_window = enable_smi_window,
B
Brijesh Singh 已提交
6917 6918

	.mem_enc_op = svm_mem_enc_op,
6919 6920
	.mem_enc_reg_region = svm_register_enc_region,
	.mem_enc_unreg_region = svm_unregister_enc_region,
A
Avi Kivity 已提交
6921 6922 6923 6924
};

static int __init svm_init(void)
{
6925
	return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
6926
			__alignof__(struct vcpu_svm), THIS_MODULE);
A
Avi Kivity 已提交
6927 6928 6929 6930
}

static void __exit svm_exit(void)
{
6931
	kvm_exit();
A
Avi Kivity 已提交
6932 6933 6934 6935
}

module_init(svm_init)
module_exit(svm_exit)