svm.c 174.8 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/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 u8 rsm_ins_bytes[] = "\x0f\xaa";

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static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
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static void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa);
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static void svm_complete_interrupts(struct vcpu_svm *svm);
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static 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;
};

595
static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
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596

597
#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)

601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621
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)
{
626
	asm volatile (__ex(SVM_CLGI));
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627 628 629 630
}

static inline void stgi(void)
{
631
	asm volatile (__ex(SVM_STGI));
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632 633 634 635
}

static inline void invlpga(unsigned long addr, u32 asid)
{
J
Joerg Roedel 已提交
636
	asm volatile (__ex(SVM_INVLPGA) : : "a"(addr), "c"(asid));
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637 638
}

639
static int get_npt_level(struct kvm_vcpu *vcpu)
640 641
{
#ifdef CONFIG_X86_64
642
	return PT64_ROOT_4LEVEL;
643 644 645 646 647
#else
	return PT32E_ROOT_LEVEL;
#endif
}

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static void svm_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
650
	vcpu->arch.efer = efer;
651
	if (!npt_enabled && !(efer & EFER_LMA))
652
		efer &= ~EFER_LME;
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653

654
	to_svm(vcpu)->vmcb->save.efer = efer | EFER_SVME;
655
	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);
}

664
static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu)
665 666 667 668 669
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u32 ret = 0;

	if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
670 671
		ret = KVM_X86_SHADOW_INT_STI | KVM_X86_SHADOW_INT_MOV_SS;
	return ret;
672 673 674 675 676 677 678 679 680 681 682 683 684
}

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)
{
687 688
	struct vcpu_svm *svm = to_svm(vcpu);

689
	if (svm->vmcb->control.next_rip != 0) {
690
		WARN_ON_ONCE(!static_cpu_has(X86_FEATURE_NRIPS));
691
		svm->next_rip = svm->vmcb->control.next_rip;
692
	}
693

694
	if (!svm->next_rip) {
695
		if (emulate_instruction(vcpu, EMULTYPE_SKIP) !=
696 697
				EMULATE_DONE)
			printk(KERN_DEBUG "%s: NOP\n", __func__);
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		return;
	}
700 701 702
	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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703

704
	kvm_rip_write(vcpu, svm->next_rip);
705
	svm_set_interrupt_shadow(vcpu, 0);
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}

708
static void svm_queue_exception(struct kvm_vcpu *vcpu)
J
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{
	struct vcpu_svm *svm = to_svm(vcpu);
711 712
	unsigned nr = vcpu->arch.exception.nr;
	bool has_error_code = vcpu->arch.exception.has_error_code;
713
	bool reinject = vcpu->arch.exception.injected;
714
	u32 error_code = vcpu->arch.exception.error_code;
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715

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716 717 718 719
	/*
	 * If we are within a nested VM we'd better #VMEXIT and let the guest
	 * handle the exception
	 */
720 721
	if (!reinject &&
	    nested_svm_check_exception(svm, nr, has_error_code, error_code))
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722 723
		return;

724
	if (nr == BP_VECTOR && !static_cpu_has(X86_FEATURE_NRIPS)) {
725 726 727 728 729 730 731 732 733 734 735 736 737 738 739
		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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740 741 742 743 744 745 746
	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;
}

747 748 749 750 751 752
static void svm_init_erratum_383(void)
{
	u32 low, high;
	int err;
	u64 val;

753
	if (!static_cpu_has_bug(X86_BUG_AMD_TLB_MMATCH))
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770
		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;
}

771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791
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)
{
794
	const char *msg;
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795

796
	if (!cpu_has_svm(&msg)) {
J
Joe Perches 已提交
797
		printk(KERN_INFO "has_svm: %s\n", msg);
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798 799 800 801 802 803
		return 0;
	}

	return 1;
}

804
static void svm_hardware_disable(void)
A
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805
{
806 807 808 809
	/* Make sure we clean up behind us */
	if (static_cpu_has(X86_FEATURE_TSCRATEMSR))
		wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);

810
	cpu_svm_disable();
811 812

	amd_pmu_disable_virt();
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}

815
static int svm_hardware_enable(void)
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816 817
{

818
	struct svm_cpu_data *sd;
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819 820 821 822
	uint64_t efer;
	struct desc_struct *gdt;
	int me = raw_smp_processor_id();

823 824 825 826
	rdmsrl(MSR_EFER, efer);
	if (efer & EFER_SVME)
		return -EBUSY;

A
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827
	if (!has_svm()) {
828
		pr_err("%s: err EOPNOTSUPP on %d\n", __func__, me);
829
		return -EINVAL;
A
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830
	}
831 832
	sd = per_cpu(svm_data, me);
	if (!sd) {
833
		pr_err("%s: svm_data is NULL on %d\n", __func__, me);
834
		return -EINVAL;
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835 836
	}

837 838 839
	sd->asid_generation = 1;
	sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1;
	sd->next_asid = sd->max_asid + 1;
840
	sd->min_asid = max_sev_asid + 1;
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841

842
	gdt = get_current_gdt_rw();
843
	sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
A
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844

845
	wrmsrl(MSR_EFER, efer | EFER_SVME);
A
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846

847
	wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);
848

849 850
	if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
		wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
851
		__this_cpu_write(current_tsc_ratio, TSC_RATIO_DEFAULT);
852 853
	}

854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883

	/*
	 * 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;

884 885
	svm_init_erratum_383();

886 887
	amd_pmu_enable_virt();

888
	return 0;
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889 890
}

891 892
static void svm_cpu_uninit(int cpu)
{
893
	struct svm_cpu_data *sd = per_cpu(svm_data, raw_smp_processor_id());
894

895
	if (!sd)
896 897 898
		return;

	per_cpu(svm_data, raw_smp_processor_id()) = NULL;
899
	kfree(sd->sev_vmcbs);
900 901
	__free_page(sd->save_area);
	kfree(sd);
902 903
}

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904 905
static int svm_cpu_init(int cpu)
{
906
	struct svm_cpu_data *sd;
A
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907 908
	int r;

909 910
	sd = kzalloc(sizeof(struct svm_cpu_data), GFP_KERNEL);
	if (!sd)
A
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911
		return -ENOMEM;
912
	sd->cpu = cpu;
A
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913
	r = -ENOMEM;
914
	sd->save_area = alloc_page(GFP_KERNEL);
915
	if (!sd->save_area)
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916 917
		goto err_1;

918 919 920 921 922 923 924
	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;
	}

925
	per_cpu(svm_data, cpu) = sd;
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926 927 928 929

	return 0;

err_1:
930
	kfree(sd);
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931 932 933 934
	return r;

}

935 936 937 938 939 940 941 942 943 944 945
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;
}

946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964
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);
}

965 966
static void set_msr_interception(u32 *msrpm, unsigned msr,
				 int read, int write)
A
Avi Kivity 已提交
967
{
968 969 970
	u8 bit_read, bit_write;
	unsigned long tmp;
	u32 offset;
A
Avi Kivity 已提交
971

972 973 974 975 976 977
	/*
	 * If this warning triggers extend the direct_access_msrs list at the
	 * beginning of the file
	 */
	WARN_ON(!valid_msr_intercept(msr));

978 979 980 981 982 983 984 985 986 987 988
	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
989 990
}

991
static void svm_vcpu_init_msrpm(u32 *msrpm)
A
Avi Kivity 已提交
992 993 994
{
	int i;

995 996
	memset(msrpm, 0xff, PAGE_SIZE * (1 << MSRPM_ALLOC_ORDER));

997 998 999 1000 1001 1002
	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);
	}
1003 1004
}

1005 1006 1007 1008 1009 1010 1011 1012
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)
1013
			return;
1014 1015 1016 1017 1018 1019 1020 1021 1022

		/* 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
1023
	}
1024 1025 1026 1027 1028

	/*
	 * If this BUG triggers the msrpm_offsets table has an overflow. Just
	 * increase MSRPM_OFFSETS in this case.
	 */
1029
	BUG();
A
Avi Kivity 已提交
1030 1031
}

1032
static void init_msrpm_offsets(void)
1033
{
1034
	int i;
1035

1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
	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);
	}
1046 1047
}

1048 1049 1050 1051
static void svm_enable_lbrv(struct vcpu_svm *svm)
{
	u32 *msrpm = svm->msrpm;

1052
	svm->vmcb->control.virt_ext |= LBR_CTL_ENABLE_MASK;
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
	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;

1063
	svm->vmcb->control.virt_ext &= ~LBR_CTL_ENABLE_MASK;
1064 1065 1066 1067 1068 1069
	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);
}

1070 1071 1072
static void disable_nmi_singlestep(struct vcpu_svm *svm)
{
	svm->nmi_singlestep = false;
1073

1074 1075 1076 1077 1078 1079 1080
	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;
	}
1081 1082
}

1083 1084 1085 1086 1087 1088
/* 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
1089
static DEFINE_HASHTABLE(svm_vm_data_hash, SVM_VM_DATA_HASH_BITS);
1090 1091
static u32 next_vm_id = 0;
static bool next_vm_id_wrapped = 0;
1092
static DEFINE_SPINLOCK(svm_vm_data_hash_lock);
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 1124

/* 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.
	 */
1125
	if (vcpu)
1126 1127 1128 1129 1130
		kvm_vcpu_wake_up(vcpu);

	return 0;
}

B
Brijesh Singh 已提交
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
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
1142 1143 1144 1145 1146 1147 1148 1149 1150
	/* 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
1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
	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
1173 1174 1175 1176
static __init int svm_hardware_setup(void)
{
	int cpu;
	struct page *iopm_pages;
1177
	void *iopm_va;
A
Avi Kivity 已提交
1178 1179 1180 1181 1182 1183
	int r;

	iopm_pages = alloc_pages(GFP_KERNEL, IOPM_ALLOC_ORDER);

	if (!iopm_pages)
		return -ENOMEM;
1184 1185 1186

	iopm_va = page_address(iopm_pages);
	memset(iopm_va, 0xff, PAGE_SIZE * (1 << IOPM_ALLOC_ORDER));
A
Avi Kivity 已提交
1187 1188
	iopm_base = page_to_pfn(iopm_pages) << PAGE_SHIFT;

1189 1190
	init_msrpm_offsets();

1191 1192 1193
	if (boot_cpu_has(X86_FEATURE_NX))
		kvm_enable_efer_bits(EFER_NX);

A
Alexander Graf 已提交
1194 1195 1196
	if (boot_cpu_has(X86_FEATURE_FXSR_OPT))
		kvm_enable_efer_bits(EFER_FFXSR);

1197 1198
	if (boot_cpu_has(X86_FEATURE_TSCRATEMSR)) {
		kvm_has_tsc_control = true;
1199 1200
		kvm_max_tsc_scaling_ratio = TSC_RATIO_MAX;
		kvm_tsc_scaling_ratio_frac_bits = 32;
1201 1202
	}

1203 1204
	if (nested) {
		printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
1205
		kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
1206 1207
	}

B
Brijesh Singh 已提交
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218
	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
1219
	for_each_possible_cpu(cpu) {
A
Avi Kivity 已提交
1220 1221
		r = svm_cpu_init(cpu);
		if (r)
1222
			goto err;
A
Avi Kivity 已提交
1223
	}
1224

1225
	if (!boot_cpu_has(X86_FEATURE_NPT))
1226 1227
		npt_enabled = false;

1228 1229 1230 1231 1232
	if (npt_enabled && !npt) {
		printk(KERN_INFO "kvm: Nested Paging disabled\n");
		npt_enabled = false;
	}

1233
	if (npt_enabled) {
1234
		printk(KERN_INFO "kvm: Nested Paging enabled\n");
1235
		kvm_enable_tdp();
1236 1237
	} else
		kvm_disable_tdp();
1238

1239 1240 1241
	if (avic) {
		if (!npt_enabled ||
		    !boot_cpu_has(X86_FEATURE_AVIC) ||
1242
		    !IS_ENABLED(CONFIG_X86_LOCAL_APIC)) {
1243
			avic = false;
1244
		} else {
1245
			pr_info("AVIC enabled\n");
1246 1247 1248

			amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
		}
1249
	}
1250

1251 1252
	if (vls) {
		if (!npt_enabled ||
1253
		    !boot_cpu_has(X86_FEATURE_V_VMSAVE_VMLOAD) ||
1254 1255 1256 1257 1258 1259 1260
		    !IS_ENABLED(CONFIG_X86_64)) {
			vls = false;
		} else {
			pr_info("Virtual VMLOAD VMSAVE supported\n");
		}
	}

1261 1262 1263 1264 1265 1266 1267
	if (vgif) {
		if (!boot_cpu_has(X86_FEATURE_VGIF))
			vgif = false;
		else
			pr_info("Virtual GIF supported\n");
	}

A
Avi Kivity 已提交
1268 1269
	return 0;

1270
err:
A
Avi Kivity 已提交
1271 1272 1273 1274 1275 1276 1277
	__free_pages(iopm_pages, IOPM_ALLOC_ORDER);
	iopm_base = 0;
	return r;
}

static __exit void svm_hardware_unsetup(void)
{
1278 1279
	int cpu;

B
Brijesh Singh 已提交
1280 1281 1282
	if (svm_sev_enabled())
		kfree(sev_asid_bitmap);

Z
Zachary Amsden 已提交
1283
	for_each_possible_cpu(cpu)
1284 1285
		svm_cpu_uninit(cpu);

A
Avi Kivity 已提交
1286
	__free_pages(pfn_to_page(iopm_base >> PAGE_SHIFT), IOPM_ALLOC_ORDER);
1287
	iopm_base = 0;
A
Avi Kivity 已提交
1288 1289 1290 1291 1292 1293
}

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
1294
		      SVM_SELECTOR_WRITE_MASK; /* Read/Write Data Segment */
A
Avi Kivity 已提交
1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
	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;
}

1307 1308 1309 1310 1311
static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 g_tsc_offset = 0;

1312
	if (is_guest_mode(vcpu)) {
1313 1314 1315
		g_tsc_offset = svm->vmcb->control.tsc_offset -
			       svm->nested.hsave->control.tsc_offset;
		svm->nested.hsave->control.tsc_offset = offset;
1316 1317 1318 1319
	} else
		trace_kvm_write_tsc_offset(vcpu->vcpu_id,
					   svm->vmcb->control.tsc_offset,
					   offset);
1320 1321

	svm->vmcb->control.tsc_offset = offset + g_tsc_offset;
1322 1323

	mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
1324 1325
}

1326 1327 1328 1329
static void avic_init_vmcb(struct vcpu_svm *svm)
{
	struct vmcb *vmcb = svm->vmcb;
	struct kvm_arch *vm_data = &svm->vcpu.kvm->arch;
1330 1331 1332
	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));
1333 1334 1335 1336 1337 1338 1339 1340

	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
1341
static void init_vmcb(struct vcpu_svm *svm)
A
Avi Kivity 已提交
1342
{
1343 1344
	struct vmcb_control_area *control = &svm->vmcb->control;
	struct vmcb_save_area *save = &svm->vmcb->save;
A
Avi Kivity 已提交
1345

1346
	svm->vcpu.arch.hflags = 0;
1347

1348 1349 1350 1351 1352 1353
	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);
1354 1355
	if (!kvm_vcpu_apicv_active(&svm->vcpu))
		set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
A
Avi Kivity 已提交
1356

1357
	set_dr_intercepts(svm);
A
Avi Kivity 已提交
1358

1359 1360 1361
	set_exception_intercept(svm, PF_VECTOR);
	set_exception_intercept(svm, UD_VECTOR);
	set_exception_intercept(svm, MC_VECTOR);
1362
	set_exception_intercept(svm, AC_VECTOR);
1363
	set_exception_intercept(svm, DB_VECTOR);
A
Avi Kivity 已提交
1364

1365 1366 1367 1368
	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
1369
	set_intercept(svm, INTERCEPT_RDPMC);
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386
	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
1387
	set_intercept(svm, INTERCEPT_XSETBV);
B
Brijesh Singh 已提交
1388
	set_intercept(svm, INTERCEPT_RSM);
A
Avi Kivity 已提交
1389

1390 1391 1392 1393 1394
	if (!kvm_mwait_in_guest()) {
		set_intercept(svm, INTERCEPT_MONITOR);
		set_intercept(svm, INTERCEPT_MWAIT);
	}

1395 1396
	control->iopm_base_pa = __sme_set(iopm_base);
	control->msrpm_base_pa = __sme_set(__pa(svm->msrpm));
A
Avi Kivity 已提交
1397 1398 1399 1400 1401 1402 1403 1404 1405
	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;
1406
	save->cs.base = 0xffff0000;
A
Avi Kivity 已提交
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417
	/* 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
1418
	svm_set_efer(&svm->vcpu, 0);
M
Mike Day 已提交
1419
	save->dr6 = 0xffff0ff0;
1420
	kvm_set_rflags(&svm->vcpu, 2);
A
Avi Kivity 已提交
1421
	save->rip = 0x0000fff0;
1422
	svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip;
A
Avi Kivity 已提交
1423

J
Joerg Roedel 已提交
1424
	/*
1425
	 * svm_set_cr0() sets PG and WP and clears NW and CD on save->cr0.
1426
	 * It also updates the guest-visible cr0 value.
A
Avi Kivity 已提交
1427
	 */
1428
	svm_set_cr0(&svm->vcpu, X86_CR0_NW | X86_CR0_CD | X86_CR0_ET);
1429
	kvm_mmu_reset_context(&svm->vcpu);
1430

1431
	save->cr4 = X86_CR4_PAE;
A
Avi Kivity 已提交
1432
	/* rdx = ?? */
1433 1434 1435

	if (npt_enabled) {
		/* Setup VMCB for Nested Paging */
1436
		control->nested_ctl |= SVM_NESTED_CTL_NP_ENABLE;
1437
		clr_intercept(svm, INTERCEPT_INVLPG);
1438
		clr_exception_intercept(svm, PF_VECTOR);
1439 1440
		clr_cr_intercept(svm, INTERCEPT_CR3_READ);
		clr_cr_intercept(svm, INTERCEPT_CR3_WRITE);
1441
		save->g_pat = svm->vcpu.arch.pat;
1442 1443 1444
		save->cr3 = 0;
		save->cr4 = 0;
	}
1445
	svm->asid_generation = 0;
1446

1447
	svm->nested.vmcb = 0;
1448 1449
	svm->vcpu.arch.hflags = 0;

1450
	if (boot_cpu_has(X86_FEATURE_PAUSEFILTER)) {
1451
		control->pause_filter_count = 3000;
1452
		set_intercept(svm, INTERCEPT_PAUSE);
1453 1454
	}

1455
	if (kvm_vcpu_apicv_active(&svm->vcpu))
1456 1457
		avic_init_vmcb(svm);

1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
	/*
	 * 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;
	}

1468 1469 1470 1471 1472 1473
	if (vgif) {
		clr_intercept(svm, INTERCEPT_STGI);
		clr_intercept(svm, INTERCEPT_CLGI);
		svm->vmcb->control.int_ctl |= V_GIF_ENABLE_MASK;
	}

1474
	if (sev_guest(svm->vcpu.kvm)) {
B
Brijesh Singh 已提交
1475
		svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ENABLE;
1476 1477
		clr_exception_intercept(svm, UD_VECTOR);
	}
B
Brijesh Singh 已提交
1478

1479 1480
	mark_all_dirty(svm->vmcb);

1481
	enable_gif(svm);
1482 1483 1484

}

1485 1486
static u64 *avic_get_physical_id_entry(struct kvm_vcpu *vcpu,
				       unsigned int index)
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 1549 1550
{
	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);
1551 1552 1553
	new_entry = __sme_set((page_to_phys(svm->avic_backing_page) &
			      AVIC_PHYSICAL_ID_ENTRY_BACKING_PAGE_MASK) |
			      AVIC_PHYSICAL_ID_ENTRY_VALID_MASK);
1554 1555 1556 1557 1558 1559 1560
	WRITE_ONCE(*entry, new_entry);

	svm->avic_physical_id_cache = entry;

	return 0;
}

B
Brijesh Singh 已提交
1561 1562
static void __sev_asid_free(int asid)
{
1563 1564
	struct svm_cpu_data *sd;
	int cpu, pos;
B
Brijesh Singh 已提交
1565 1566 1567

	pos = asid - 1;
	clear_bit(pos, sev_asid_bitmap);
1568 1569 1570 1571 1572

	for_each_possible_cpu(cpu) {
		sd = per_cpu(svm_data, cpu);
		sd->sev_vmcbs[pos] = NULL;
	}
B
Brijesh Singh 已提交
1573 1574 1575 1576 1577 1578 1579 1580 1581
}

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

	__sev_asid_free(sev->asid);
}

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 1611 1612
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);
}

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 1688 1689
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);
	}
}

1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705
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
1706 1707
static void sev_vm_destroy(struct kvm *kvm)
{
1708
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
1709 1710
	struct list_head *head = &sev->regions_list;
	struct list_head *pos, *q;
1711

B
Brijesh Singh 已提交
1712 1713 1714
	if (!sev_guest(kvm))
		return;

1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
	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);

1730
	sev_unbind_asid(kvm, sev->handle);
B
Brijesh Singh 已提交
1731 1732 1733
	sev_asid_free(kvm);
}

1734 1735
static void avic_vm_destroy(struct kvm *kvm)
{
1736
	unsigned long flags;
1737 1738
	struct kvm_arch *vm_data = &kvm->arch;

1739 1740 1741
	if (!avic)
		return;

1742 1743 1744 1745
	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);
1746 1747 1748 1749

	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
	hash_del(&vm_data->hnode);
	spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);
1750 1751
}

B
Brijesh Singh 已提交
1752 1753 1754 1755 1756 1757
static void svm_vm_destroy(struct kvm *kvm)
{
	avic_vm_destroy(kvm);
	sev_vm_destroy(kvm);
}

1758 1759
static int avic_vm_init(struct kvm *kvm)
{
1760
	unsigned long flags;
1761
	int err = -ENOMEM;
1762 1763 1764
	struct kvm_arch *vm_data = &kvm->arch;
	struct page *p_page;
	struct page *l_page;
1765 1766
	struct kvm_arch *ka;
	u32 vm_id;
1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786

	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));

1787
	spin_lock_irqsave(&svm_vm_data_hash_lock, flags);
1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
 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;
1804 1805 1806
	hash_add(svm_vm_data_hash, &vm_data->hnode, vm_data->avic_vm_id);
	spin_unlock_irqrestore(&svm_vm_data_hash_lock, flags);

1807 1808 1809 1810 1811
	return 0;

free_avic:
	avic_vm_destroy(kvm);
	return err;
A
Avi Kivity 已提交
1812 1813
}

1814 1815
static inline int
avic_update_iommu_vcpu_affinity(struct kvm_vcpu *vcpu, int cpu, bool r)
1816
{
1817 1818 1819
	int ret = 0;
	unsigned long flags;
	struct amd_svm_iommu_ir *ir;
1820 1821
	struct vcpu_svm *svm = to_svm(vcpu);

1822 1823
	if (!kvm_arch_has_assigned_device(vcpu->kvm))
		return 0;
1824

1825 1826 1827 1828 1829
	/*
	 * 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);
1830

1831 1832
	if (list_empty(&svm->ir_list))
		goto out;
1833

1834 1835 1836 1837 1838 1839 1840 1841
	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;
1842 1843 1844 1845 1846 1847
}

static void avic_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	u64 entry;
	/* ID = 0xff (broadcast), ID > 0xff (reserved) */
1848
	int h_physical_id = kvm_cpu_get_apicid(cpu);
1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867
	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);
1868 1869
	avic_update_iommu_vcpu_affinity(vcpu, h_physical_id,
					svm->avic_is_running);
1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880
}

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));
1881 1882 1883
	if (entry & AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK)
		avic_update_iommu_vcpu_affinity(vcpu, -1, 0);

1884 1885
	entry &= ~AVIC_PHYSICAL_ID_ENTRY_IS_RUNNING_MASK;
	WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
A
Avi Kivity 已提交
1886 1887
}

1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901
/**
 * 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);
}

1902
static void svm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
1903 1904
{
	struct vcpu_svm *svm = to_svm(vcpu);
1905 1906
	u32 dummy;
	u32 eax = 1;
1907

1908 1909
	svm->spec_ctrl = 0;

1910 1911 1912 1913 1914 1915
	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
1916
	init_vmcb(svm);
A
Avi Kivity 已提交
1917

1918
	kvm_cpuid(vcpu, &eax, &dummy, &dummy, &dummy, true);
1919
	kvm_register_write(vcpu, VCPU_REGS_RDX, eax);
1920 1921 1922

	if (kvm_vcpu_apicv_active(vcpu) && !init_event)
		avic_update_vapic_bar(svm, APIC_DEFAULT_PHYS_BASE);
1923 1924
}

1925 1926 1927 1928
static int avic_init_vcpu(struct vcpu_svm *svm)
{
	int ret;

1929
	if (!kvm_vcpu_apicv_active(&svm->vcpu))
1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941
		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
1942
static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
A
Avi Kivity 已提交
1943
{
1944
	struct vcpu_svm *svm;
A
Avi Kivity 已提交
1945
	struct page *page;
1946
	struct page *msrpm_pages;
A
Alexander Graf 已提交
1947
	struct page *hsave_page;
A
Alexander Graf 已提交
1948
	struct page *nested_msrpm_pages;
R
Rusty Russell 已提交
1949
	int err;
A
Avi Kivity 已提交
1950

1951
	svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
R
Rusty Russell 已提交
1952 1953 1954 1955 1956 1957 1958 1959 1960
	if (!svm) {
		err = -ENOMEM;
		goto out;
	}

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

1961
	err = -ENOMEM;
A
Avi Kivity 已提交
1962
	page = alloc_page(GFP_KERNEL);
1963
	if (!page)
R
Rusty Russell 已提交
1964
		goto uninit;
A
Avi Kivity 已提交
1965

1966 1967
	msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
	if (!msrpm_pages)
1968
		goto free_page1;
A
Alexander Graf 已提交
1969 1970 1971

	nested_msrpm_pages = alloc_pages(GFP_KERNEL, MSRPM_ALLOC_ORDER);
	if (!nested_msrpm_pages)
1972
		goto free_page2;
1973

A
Alexander Graf 已提交
1974 1975
	hsave_page = alloc_page(GFP_KERNEL);
	if (!hsave_page)
1976 1977
		goto free_page3;

1978 1979 1980
	err = avic_init_vcpu(svm);
	if (err)
		goto free_page4;
1981

1982 1983 1984 1985 1986
	/* 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;

1987
	svm->nested.hsave = page_address(hsave_page);
A
Alexander Graf 已提交
1988

1989 1990 1991
	svm->msrpm = page_address(msrpm_pages);
	svm_vcpu_init_msrpm(svm->msrpm);

1992
	svm->nested.msrpm = page_address(nested_msrpm_pages);
1993
	svm_vcpu_init_msrpm(svm->nested.msrpm);
A
Alexander Graf 已提交
1994

1995 1996
	svm->vmcb = page_address(page);
	clear_page(svm->vmcb);
1997
	svm->vmcb_pa = __sme_set(page_to_pfn(page) << PAGE_SHIFT);
1998
	svm->asid_generation = 0;
P
Paolo Bonzini 已提交
1999
	init_vmcb(svm);
A
Avi Kivity 已提交
2000

2001 2002
	svm_init_osvw(&svm->vcpu);

R
Rusty Russell 已提交
2003
	return &svm->vcpu;
2004

2005 2006
free_page4:
	__free_page(hsave_page);
2007 2008 2009 2010 2011 2012
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
2013 2014 2015
uninit:
	kvm_vcpu_uninit(&svm->vcpu);
free_svm:
2016
	kmem_cache_free(kvm_vcpu_cache, svm);
R
Rusty Russell 已提交
2017 2018
out:
	return ERR_PTR(err);
A
Avi Kivity 已提交
2019 2020 2021 2022
}

static void svm_free_vcpu(struct kvm_vcpu *vcpu)
{
2023 2024
	struct vcpu_svm *svm = to_svm(vcpu);

2025
	__free_page(pfn_to_page(__sme_clr(svm->vmcb_pa) >> PAGE_SHIFT));
2026
	__free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
2027 2028
	__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
2029
	kvm_vcpu_uninit(vcpu);
2030
	kmem_cache_free(kvm_vcpu_cache, svm);
A
Ashok Raj 已提交
2031 2032 2033 2034 2035
	/*
	 * 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
2036 2037
}

2038
static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
A
Avi Kivity 已提交
2039
{
2040
	struct vcpu_svm *svm = to_svm(vcpu);
A
Ashok Raj 已提交
2041
	struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
2042
	int i;
2043 2044

	if (unlikely(cpu != vcpu->cpu)) {
2045
		svm->asid_generation = 0;
2046
		mark_all_dirty(svm->vmcb);
2047
	}
2048

2049 2050 2051
#ifdef CONFIG_X86_64
	rdmsrl(MSR_GS_BASE, to_svm(vcpu)->host.gs_base);
#endif
2052 2053 2054 2055
	savesegment(fs, svm->host.fs);
	savesegment(gs, svm->host.gs);
	svm->host.ldt = kvm_read_ldt();

2056
	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
2057
		rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
2058

2059 2060 2061 2062 2063 2064
	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);
		}
2065
	}
P
Paolo Bonzini 已提交
2066 2067 2068
	/* This assumes that the kernel never uses MSR_TSC_AUX */
	if (static_cpu_has(X86_FEATURE_RDTSCP))
		wrmsrl(MSR_TSC_AUX, svm->tsc_aux);
2069

A
Ashok Raj 已提交
2070 2071 2072 2073
	if (sd->current_vmcb != svm->vmcb) {
		sd->current_vmcb = svm->vmcb;
		indirect_branch_prediction_barrier();
	}
2074
	avic_vcpu_load(vcpu, cpu);
A
Avi Kivity 已提交
2075 2076 2077 2078
}

static void svm_vcpu_put(struct kvm_vcpu *vcpu)
{
2079
	struct vcpu_svm *svm = to_svm(vcpu);
2080 2081
	int i;

2082 2083
	avic_vcpu_put(vcpu);

2084
	++vcpu->stat.host_state_reload;
2085 2086 2087
	kvm_load_ldt(svm->host.ldt);
#ifdef CONFIG_X86_64
	loadsegment(fs, svm->host.fs);
2088
	wrmsrl(MSR_KERNEL_GS_BASE, current->thread.gsbase);
2089
	load_gs_index(svm->host.gs);
2090
#else
2091
#ifdef CONFIG_X86_32_LAZY_GS
2092
	loadsegment(gs, svm->host.gs);
2093
#endif
2094
#endif
2095
	for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
2096
		wrmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
A
Avi Kivity 已提交
2097 2098
}

2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
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
2109 2110
static unsigned long svm_get_rflags(struct kvm_vcpu *vcpu)
{
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121
	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
2122 2123 2124 2125
}

static void svm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
2126 2127 2128
	if (to_svm(vcpu)->nmi_singlestep)
		rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);

P
Paolo Bonzini 已提交
2129
       /*
A
Andrea Gelmini 已提交
2130
        * Any change of EFLAGS.VM is accompanied by a reload of SS
P
Paolo Bonzini 已提交
2131 2132 2133
        * (caused by either a task switch or an inter-privilege IRET),
        * so we do not need to update the CPL here.
        */
2134
	to_svm(vcpu)->vmcb->save.rflags = rflags;
A
Avi Kivity 已提交
2135 2136
}

A
Avi Kivity 已提交
2137 2138 2139 2140 2141
static void svm_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
{
	switch (reg) {
	case VCPU_EXREG_PDPTR:
		BUG_ON(!npt_enabled);
2142
		load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
A
Avi Kivity 已提交
2143 2144 2145 2146 2147 2148
		break;
	default:
		BUG();
	}
}

2149 2150
static void svm_set_vintr(struct vcpu_svm *svm)
{
2151
	set_intercept(svm, INTERCEPT_VINTR);
2152 2153 2154 2155
}

static void svm_clear_vintr(struct vcpu_svm *svm)
{
2156
	clr_intercept(svm, INTERCEPT_VINTR);
2157 2158
}

A
Avi Kivity 已提交
2159 2160
static struct vmcb_seg *svm_seg(struct kvm_vcpu *vcpu, int seg)
{
2161
	struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;
A
Avi Kivity 已提交
2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173

	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
2174
	return NULL;
A
Avi Kivity 已提交
2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198
}

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;
2199 2200 2201 2202 2203 2204 2205 2206 2207 2208

	/*
	 * 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;
2209

J
Joerg Roedel 已提交
2210 2211
	/*
	 * AMD's VMCB does not have an explicit unusable field, so emulate it
2212 2213
	 * for cross vendor migration purposes by "not present"
	 */
2214
	var->unusable = !var->present;
2215

2216 2217 2218 2219 2220 2221
	switch (seg) {
	case VCPU_SREG_TR:
		/*
		 * Work around a bug where the busy flag in the tr selector
		 * isn't exposed
		 */
2222
		var->type |= 0x2;
2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237
		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;
2238
	case VCPU_SREG_SS:
J
Joerg Roedel 已提交
2239 2240
		/*
		 * On AMD CPUs sometimes the DB bit in the segment
2241 2242 2243 2244 2245 2246
		 * 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;
2247
		/* This is symmetric with svm_set_segment() */
J
Jan Kiszka 已提交
2248
		var->dpl = to_svm(vcpu)->vmcb->save.cpl;
2249
		break;
2250
	}
A
Avi Kivity 已提交
2251 2252
}

2253 2254 2255 2256 2257 2258 2259
static int svm_get_cpl(struct kvm_vcpu *vcpu)
{
	struct vmcb_save_area *save = &to_svm(vcpu)->vmcb->save;

	return save->cpl;
}

2260
static void svm_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2261
{
2262 2263
	struct vcpu_svm *svm = to_svm(vcpu);

2264 2265
	dt->size = svm->vmcb->save.idtr.limit;
	dt->address = svm->vmcb->save.idtr.base;
A
Avi Kivity 已提交
2266 2267
}

2268
static void svm_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2269
{
2270 2271
	struct vcpu_svm *svm = to_svm(vcpu);

2272 2273
	svm->vmcb->save.idtr.limit = dt->size;
	svm->vmcb->save.idtr.base = dt->address ;
2274
	mark_dirty(svm->vmcb, VMCB_DT);
A
Avi Kivity 已提交
2275 2276
}

2277
static void svm_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
A
Avi Kivity 已提交
2278
{
2279 2280
	struct vcpu_svm *svm = to_svm(vcpu);

2281 2282
	dt->size = svm->vmcb->save.gdtr.limit;
	dt->address = svm->vmcb->save.gdtr.base;
A
Avi Kivity 已提交
2283 2284
}

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

2289 2290
	svm->vmcb->save.gdtr.limit = dt->size;
	svm->vmcb->save.gdtr.base = dt->address ;
2291
	mark_dirty(svm->vmcb, VMCB_DT);
A
Avi Kivity 已提交
2292 2293
}

2294 2295 2296 2297
static void svm_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
{
}

2298 2299 2300 2301
static void svm_decache_cr3(struct kvm_vcpu *vcpu)
{
}

2302
static void svm_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
2303 2304 2305
{
}

A
Avi Kivity 已提交
2306 2307 2308 2309 2310
static void update_cr0_intercept(struct vcpu_svm *svm)
{
	ulong gcr0 = svm->vcpu.arch.cr0;
	u64 *hcr0 = &svm->vmcb->save.cr0;

2311 2312
	*hcr0 = (*hcr0 & ~SVM_CR0_SELECTIVE_MASK)
		| (gcr0 & SVM_CR0_SELECTIVE_MASK);
A
Avi Kivity 已提交
2313

2314
	mark_dirty(svm->vmcb, VMCB_CR);
A
Avi Kivity 已提交
2315

2316
	if (gcr0 == *hcr0) {
2317 2318
		clr_cr_intercept(svm, INTERCEPT_CR0_READ);
		clr_cr_intercept(svm, INTERCEPT_CR0_WRITE);
A
Avi Kivity 已提交
2319
	} else {
2320 2321
		set_cr_intercept(svm, INTERCEPT_CR0_READ);
		set_cr_intercept(svm, INTERCEPT_CR0_WRITE);
A
Avi Kivity 已提交
2322 2323 2324
	}
}

A
Avi Kivity 已提交
2325 2326
static void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
2327 2328
	struct vcpu_svm *svm = to_svm(vcpu);

2329
#ifdef CONFIG_X86_64
2330
	if (vcpu->arch.efer & EFER_LME) {
2331
		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
2332
			vcpu->arch.efer |= EFER_LMA;
2333
			svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
A
Avi Kivity 已提交
2334 2335
		}

M
Mike Day 已提交
2336
		if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
2337
			vcpu->arch.efer &= ~EFER_LMA;
2338
			svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
A
Avi Kivity 已提交
2339 2340 2341
		}
	}
#endif
2342
	vcpu->arch.cr0 = cr0;
2343 2344 2345

	if (!npt_enabled)
		cr0 |= X86_CR0_PG | X86_CR0_WP;
2346

2347 2348 2349 2350 2351 2352 2353
	/*
	 * 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);
2354
	svm->vmcb->save.cr0 = cr0;
2355
	mark_dirty(svm->vmcb, VMCB_CR);
A
Avi Kivity 已提交
2356
	update_cr0_intercept(svm);
A
Avi Kivity 已提交
2357 2358
}

2359
static int svm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
A
Avi Kivity 已提交
2360
{
2361
	unsigned long host_cr4_mce = cr4_read_shadow() & X86_CR4_MCE;
2362 2363
	unsigned long old_cr4 = to_svm(vcpu)->vmcb->save.cr4;

2364 2365 2366
	if (cr4 & X86_CR4_VMXE)
		return 1;

2367
	if (npt_enabled && ((old_cr4 ^ cr4) & X86_CR4_PGE))
2368
		svm_flush_tlb(vcpu, true);
2369

2370 2371 2372
	vcpu->arch.cr4 = cr4;
	if (!npt_enabled)
		cr4 |= X86_CR4_PAE;
2373
	cr4 |= host_cr4_mce;
2374
	to_svm(vcpu)->vmcb->save.cr4 = cr4;
2375
	mark_dirty(to_svm(vcpu)->vmcb, VMCB_CR);
2376
	return 0;
A
Avi Kivity 已提交
2377 2378 2379 2380 2381
}

static void svm_set_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
2382
	struct vcpu_svm *svm = to_svm(vcpu);
A
Avi Kivity 已提交
2383 2384 2385 2386 2387
	struct vmcb_seg *s = svm_seg(vcpu, seg);

	s->base = var->base;
	s->limit = var->limit;
	s->selector = var->selector;
2388 2389 2390 2391 2392 2393 2394 2395
	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
2396 2397 2398 2399 2400 2401 2402 2403

	/*
	 * 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)
2404 2405
		/* This is symmetric with svm_get_segment() */
		svm->vmcb->save.cpl = (var->dpl & 3);
A
Avi Kivity 已提交
2406

2407
	mark_dirty(svm->vmcb, VMCB_SEG);
A
Avi Kivity 已提交
2408 2409
}

2410
static void update_bp_intercept(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
2411
{
J
Jan Kiszka 已提交
2412 2413
	struct vcpu_svm *svm = to_svm(vcpu);

2414
	clr_exception_intercept(svm, BP_VECTOR);
2415

J
Jan Kiszka 已提交
2416 2417
	if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
2418
			set_exception_intercept(svm, BP_VECTOR);
J
Jan Kiszka 已提交
2419 2420
	} else
		vcpu->guest_debug = 0;
2421 2422
}

2423
static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd)
A
Avi Kivity 已提交
2424
{
2425 2426
	if (sd->next_asid > sd->max_asid) {
		++sd->asid_generation;
2427
		sd->next_asid = sd->min_asid;
2428
		svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID;
A
Avi Kivity 已提交
2429 2430
	}

2431 2432
	svm->asid_generation = sd->asid_generation;
	svm->vmcb->control.asid = sd->next_asid++;
2433 2434

	mark_dirty(svm->vmcb, VMCB_ASID);
A
Avi Kivity 已提交
2435 2436
}

J
Jan Kiszka 已提交
2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449
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);
}

2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464
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);
}

2465
static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
A
Avi Kivity 已提交
2466
{
2467 2468
	struct vcpu_svm *svm = to_svm(vcpu);

2469
	svm->vmcb->save.dr7 = value;
2470
	mark_dirty(svm->vmcb, VMCB_DR);
A
Avi Kivity 已提交
2471 2472
}

A
Avi Kivity 已提交
2473
static int pf_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2474
{
2475
	u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
2476
	u64 error_code = svm->vmcb->control.exit_info_1;
A
Avi Kivity 已提交
2477

2478
	return kvm_handle_page_fault(&svm->vcpu, error_code, fault_address,
2479 2480
			static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
			svm->vmcb->control.insn_bytes : NULL,
2481 2482 2483 2484 2485
			svm->vmcb->control.insn_len);
}

static int npf_interception(struct vcpu_svm *svm)
{
2486
	u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
2487 2488 2489 2490
	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,
2491 2492
			static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
			svm->vmcb->control.insn_bytes : NULL,
2493
			svm->vmcb->control.insn_len);
A
Avi Kivity 已提交
2494 2495
}

A
Avi Kivity 已提交
2496
static int db_interception(struct vcpu_svm *svm)
J
Jan Kiszka 已提交
2497
{
A
Avi Kivity 已提交
2498 2499
	struct kvm_run *kvm_run = svm->vcpu.run;

J
Jan Kiszka 已提交
2500
	if (!(svm->vcpu.guest_debug &
2501
	      (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
J
Jan Kiszka 已提交
2502
		!svm->nmi_singlestep) {
J
Jan Kiszka 已提交
2503 2504 2505
		kvm_queue_exception(&svm->vcpu, DB_VECTOR);
		return 1;
	}
2506

J
Jan Kiszka 已提交
2507
	if (svm->nmi_singlestep) {
2508
		disable_nmi_singlestep(svm);
2509 2510 2511
	}

	if (svm->vcpu.guest_debug &
J
Joerg Roedel 已提交
2512
	    (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) {
2513 2514 2515 2516 2517 2518 2519 2520
		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
2521 2522
}

A
Avi Kivity 已提交
2523
static int bp_interception(struct vcpu_svm *svm)
J
Jan Kiszka 已提交
2524
{
A
Avi Kivity 已提交
2525 2526
	struct kvm_run *kvm_run = svm->vcpu.run;

J
Jan Kiszka 已提交
2527 2528 2529 2530 2531 2532
	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
2533
static int ud_interception(struct vcpu_svm *svm)
2534 2535 2536
{
	int er;

2537
	er = emulate_instruction(&svm->vcpu, EMULTYPE_TRAP_UD);
2538 2539
	if (er == EMULATE_USER_EXIT)
		return 0;
2540
	if (er != EMULATE_DONE)
2541
		kvm_queue_exception(&svm->vcpu, UD_VECTOR);
2542 2543 2544
	return 1;
}

2545 2546 2547 2548 2549 2550
static int ac_interception(struct vcpu_svm *svm)
{
	kvm_queue_exception_e(&svm->vcpu, AC_VECTOR, 0);
	return 1;
}

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 2588 2589
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;
}

2590
static void svm_handle_mce(struct vcpu_svm *svm)
2591
{
2592 2593 2594 2595 2596 2597 2598
	if (is_erratum_383()) {
		/*
		 * Erratum 383 triggered. Guest state is corrupt so kill the
		 * guest.
		 */
		pr_err("KVM: Guest triggered AMD Erratum 383\n");

2599
		kvm_make_request(KVM_REQ_TRIPLE_FAULT, &svm->vcpu);
2600 2601 2602 2603

		return;
	}

2604 2605 2606 2607 2608 2609 2610 2611
	/*
	 * 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 */

2612 2613 2614 2615 2616
	return;
}

static int mc_interception(struct vcpu_svm *svm)
{
2617 2618 2619
	return 1;
}

A
Avi Kivity 已提交
2620
static int shutdown_interception(struct vcpu_svm *svm)
2621
{
A
Avi Kivity 已提交
2622 2623
	struct kvm_run *kvm_run = svm->vcpu.run;

2624 2625 2626 2627
	/*
	 * VMCB is undefined after a SHUTDOWN intercept
	 * so reinitialize it.
	 */
2628
	clear_page(svm->vmcb);
P
Paolo Bonzini 已提交
2629
	init_vmcb(svm);
2630 2631 2632 2633 2634

	kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
	return 0;
}

A
Avi Kivity 已提交
2635
static int io_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2636
{
2637
	struct kvm_vcpu *vcpu = &svm->vcpu;
M
Mike Day 已提交
2638
	u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
2639
	int size, in, string, ret;
2640
	unsigned port;
A
Avi Kivity 已提交
2641

R
Rusty Russell 已提交
2642
	++svm->vcpu.stat.io_exits;
2643
	string = (io_info & SVM_IOIO_STR_MASK) != 0;
2644
	in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
2645
	if (string)
2646
		return emulate_instruction(vcpu, 0) == EMULATE_DONE;
2647

2648 2649
	port = io_info >> 16;
	size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
2650
	svm->next_rip = svm->vmcb->control.exit_info_2;
2651
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
2652

2653 2654 2655 2656 2657 2658 2659 2660
	/*
	 * 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
2661 2662
}

A
Avi Kivity 已提交
2663
static int nmi_interception(struct vcpu_svm *svm)
2664 2665 2666 2667
{
	return 1;
}

A
Avi Kivity 已提交
2668
static int intr_interception(struct vcpu_svm *svm)
2669 2670 2671 2672 2673
{
	++svm->vcpu.stat.irq_exits;
	return 1;
}

A
Avi Kivity 已提交
2674
static int nop_on_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2675 2676 2677 2678
{
	return 1;
}

A
Avi Kivity 已提交
2679
static int halt_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
2680
{
2681
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 1;
R
Rusty Russell 已提交
2682
	return kvm_emulate_halt(&svm->vcpu);
A
Avi Kivity 已提交
2683 2684
}

A
Avi Kivity 已提交
2685
static int vmmcall_interception(struct vcpu_svm *svm)
2686
{
2687
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
2688
	return kvm_emulate_hypercall(&svm->vcpu);
2689 2690
}

2691 2692 2693 2694 2695 2696 2697
static unsigned long nested_svm_get_tdp_cr3(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

	return svm->nested.nested_cr3;
}

2698 2699 2700 2701 2702 2703 2704
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;

2705
	ret = kvm_vcpu_read_guest_page(vcpu, gpa_to_gfn(__sme_clr(cr3)), &pdpte,
2706
				       offset_in_page(cr3) + index * 8, 8);
2707 2708 2709 2710 2711
	if (ret)
		return 0;
	return pdpte;
}

2712 2713 2714 2715 2716
static void nested_svm_set_tdp_cr3(struct kvm_vcpu *vcpu,
				   unsigned long root)
{
	struct vcpu_svm *svm = to_svm(vcpu);

2717
	svm->vmcb->control.nested_cr3 = __sme_set(root);
2718
	mark_dirty(svm->vmcb, VMCB_NPT);
2719
	svm_flush_tlb(vcpu, true);
2720 2721
}

2722 2723
static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
				       struct x86_exception *fault)
2724 2725 2726
{
	struct vcpu_svm *svm = to_svm(vcpu);

2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746
	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;
2747 2748 2749 2750

	nested_svm_vmexit(svm);
}

2751
static void nested_svm_init_mmu_context(struct kvm_vcpu *vcpu)
2752
{
2753 2754
	WARN_ON(mmu_is_nested(vcpu));
	kvm_init_shadow_mmu(vcpu);
2755 2756
	vcpu->arch.mmu.set_cr3           = nested_svm_set_tdp_cr3;
	vcpu->arch.mmu.get_cr3           = nested_svm_get_tdp_cr3;
2757
	vcpu->arch.mmu.get_pdptr         = nested_svm_get_tdp_pdptr;
2758
	vcpu->arch.mmu.inject_page_fault = nested_svm_inject_npf_exit;
2759
	vcpu->arch.mmu.shadow_root_level = get_npt_level(vcpu);
2760
	reset_shadow_zero_bits_mask(vcpu, &vcpu->arch.mmu);
2761 2762 2763 2764 2765 2766 2767 2768
	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;
}

2769 2770
static int nested_svm_check_permissions(struct vcpu_svm *svm)
{
2771 2772
	if (!(svm->vcpu.arch.efer & EFER_SVME) ||
	    !is_paging(&svm->vcpu)) {
2773 2774 2775 2776 2777 2778 2779 2780 2781
		kvm_queue_exception(&svm->vcpu, UD_VECTOR);
		return 1;
	}

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

2782
	return 0;
2783 2784
}

2785 2786 2787
static int nested_svm_check_exception(struct vcpu_svm *svm, unsigned nr,
				      bool has_error_code, u32 error_code)
{
2788 2789
	int vmexit;

2790
	if (!is_guest_mode(&svm->vcpu))
2791
		return 0;
2792

2793 2794 2795 2796
	vmexit = nested_svm_intercept(svm);
	if (vmexit != NESTED_EXIT_DONE)
		return 0;

2797 2798 2799
	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;
2800 2801 2802 2803 2804 2805 2806 2807 2808 2809

	/*
	 * 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.
	 */
2810 2811 2812 2813
	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;
2814

2815
	svm->nested.exit_required = true;
2816
	return vmexit;
2817 2818
}

2819 2820
/* This function returns true if it is save to enable the irq window */
static inline bool nested_svm_intr(struct vcpu_svm *svm)
2821
{
2822
	if (!is_guest_mode(&svm->vcpu))
2823
		return true;
2824

2825
	if (!(svm->vcpu.arch.hflags & HF_VINTR_MASK))
2826
		return true;
2827

2828
	if (!(svm->vcpu.arch.hflags & HF_HIF_MASK))
2829
		return false;
2830

2831 2832 2833 2834 2835 2836 2837 2838
	/*
	 * 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;

2839 2840 2841
	svm->vmcb->control.exit_code   = SVM_EXIT_INTR;
	svm->vmcb->control.exit_info_1 = 0;
	svm->vmcb->control.exit_info_2 = 0;
2842

2843 2844 2845
	if (svm->nested.intercept & 1ULL) {
		/*
		 * The #vmexit can't be emulated here directly because this
G
Guo Chao 已提交
2846
		 * code path runs with irqs and preemption disabled. A
2847 2848 2849 2850
		 * #vmexit emulation might sleep. Only signal request for
		 * the #vmexit here.
		 */
		svm->nested.exit_required = true;
2851
		trace_kvm_nested_intr_vmexit(svm->vmcb->save.rip);
2852
		return false;
2853 2854
	}

2855
	return true;
2856 2857
}

2858 2859 2860
/* This function returns true if it is save to enable the nmi window */
static inline bool nested_svm_nmi(struct vcpu_svm *svm)
{
2861
	if (!is_guest_mode(&svm->vcpu))
2862 2863 2864 2865 2866 2867 2868 2869 2870
		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;
2871 2872
}

2873
static void *nested_svm_map(struct vcpu_svm *svm, u64 gpa, struct page **_page)
2874 2875 2876
{
	struct page *page;

2877 2878
	might_sleep();

2879
	page = kvm_vcpu_gfn_to_page(&svm->vcpu, gpa >> PAGE_SHIFT);
2880 2881 2882
	if (is_error_page(page))
		goto error;

2883 2884 2885
	*_page = page;

	return kmap(page);
2886 2887 2888 2889 2890 2891 2892

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

	return NULL;
}

2893
static void nested_svm_unmap(struct page *page)
2894
{
2895
	kunmap(page);
2896 2897 2898
	kvm_release_page_dirty(page);
}

2899 2900
static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
{
2901 2902 2903
	unsigned port, size, iopm_len;
	u16 val, mask;
	u8 start_bit;
2904
	u64 gpa;
2905

2906 2907
	if (!(svm->nested.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
		return NESTED_EXIT_HOST;
2908

2909
	port = svm->vmcb->control.exit_info_1 >> 16;
2910 2911
	size = (svm->vmcb->control.exit_info_1 & SVM_IOIO_SIZE_MASK) >>
		SVM_IOIO_SIZE_SHIFT;
2912
	gpa  = svm->nested.vmcb_iopm + (port / 8);
2913 2914 2915 2916
	start_bit = port % 8;
	iopm_len = (start_bit + size > 8) ? 2 : 1;
	mask = (0xf >> (4 - size)) << start_bit;
	val = 0;
2917

2918
	if (kvm_vcpu_read_guest(&svm->vcpu, gpa, &val, iopm_len))
2919
		return NESTED_EXIT_DONE;
2920

2921
	return (val & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
2922 2923
}

2924
static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
2925
{
2926 2927
	u32 offset, msr, value;
	int write, mask;
2928

2929
	if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
2930
		return NESTED_EXIT_HOST;
2931

2932 2933 2934 2935
	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);
2936

2937 2938
	if (offset == MSR_INVALID)
		return NESTED_EXIT_DONE;
2939

2940 2941
	/* Offset is in 32 bit units but need in 8 bit units */
	offset *= 4;
2942

2943
	if (kvm_vcpu_read_guest(&svm->vcpu, svm->nested.vmcb_msrpm + offset, &value, 4))
2944
		return NESTED_EXIT_DONE;
2945

2946
	return (value & mask) ? NESTED_EXIT_DONE : NESTED_EXIT_HOST;
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 2972 2973
/* 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;
}

2974
static int nested_svm_exit_special(struct vcpu_svm *svm)
2975 2976
{
	u32 exit_code = svm->vmcb->control.exit_code;
2977

2978 2979 2980
	switch (exit_code) {
	case SVM_EXIT_INTR:
	case SVM_EXIT_NMI:
2981
	case SVM_EXIT_EXCP_BASE + MC_VECTOR:
2982 2983
		return NESTED_EXIT_HOST;
	case SVM_EXIT_NPF:
J
Joerg Roedel 已提交
2984
		/* For now we are always handling NPFs when using them */
2985 2986 2987 2988
		if (npt_enabled)
			return NESTED_EXIT_HOST;
		break;
	case SVM_EXIT_EXCP_BASE + PF_VECTOR:
G
Gleb Natapov 已提交
2989
		/* When we're shadowing, trap PFs, but not async PF */
2990
		if (!npt_enabled && svm->vcpu.arch.apf.host_apf_reason == 0)
2991 2992 2993 2994
			return NESTED_EXIT_HOST;
		break;
	default:
		break;
2995 2996
	}

2997 2998 2999 3000 3001 3002
	return NESTED_EXIT_CONTINUE;
}

/*
 * If this function returns true, this #vmexit was already handled
 */
3003
static int nested_svm_intercept(struct vcpu_svm *svm)
3004 3005 3006 3007
{
	u32 exit_code = svm->vmcb->control.exit_code;
	int vmexit = NESTED_EXIT_HOST;

3008
	switch (exit_code) {
3009
	case SVM_EXIT_MSR:
3010
		vmexit = nested_svm_exit_handled_msr(svm);
3011
		break;
3012 3013 3014
	case SVM_EXIT_IOIO:
		vmexit = nested_svm_intercept_ioio(svm);
		break;
3015 3016 3017
	case SVM_EXIT_READ_CR0 ... SVM_EXIT_WRITE_CR8: {
		u32 bit = 1U << (exit_code - SVM_EXIT_READ_CR0);
		if (svm->nested.intercept_cr & bit)
3018
			vmexit = NESTED_EXIT_DONE;
3019 3020
		break;
	}
3021 3022 3023
	case SVM_EXIT_READ_DR0 ... SVM_EXIT_WRITE_DR7: {
		u32 bit = 1U << (exit_code - SVM_EXIT_READ_DR0);
		if (svm->nested.intercept_dr & bit)
3024
			vmexit = NESTED_EXIT_DONE;
3025 3026 3027 3028
		break;
	}
	case SVM_EXIT_EXCP_BASE ... SVM_EXIT_EXCP_BASE + 0x1f: {
		u32 excp_bits = 1 << (exit_code - SVM_EXIT_EXCP_BASE);
3029 3030 3031 3032 3033 3034
		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
3035 3036
		/* async page fault always cause vmexit */
		else if ((exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR) &&
3037
			 svm->vcpu.arch.exception.nested_apf != 0)
G
Gleb Natapov 已提交
3038
			vmexit = NESTED_EXIT_DONE;
3039 3040
		break;
	}
3041 3042 3043 3044
	case SVM_EXIT_ERR: {
		vmexit = NESTED_EXIT_DONE;
		break;
	}
3045 3046
	default: {
		u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
J
Joerg Roedel 已提交
3047
		if (svm->nested.intercept & exit_bits)
3048
			vmexit = NESTED_EXIT_DONE;
3049 3050 3051
	}
	}

3052 3053 3054 3055 3056 3057 3058 3059 3060 3061
	return vmexit;
}

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

	vmexit = nested_svm_intercept(svm);

	if (vmexit == NESTED_EXIT_DONE)
3062 3063 3064
		nested_svm_vmexit(svm);

	return vmexit;
3065 3066
}

3067 3068 3069 3070 3071
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;

3072
	dst->intercept_cr         = from->intercept_cr;
3073
	dst->intercept_dr         = from->intercept_dr;
3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093
	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;
3094
	dst->virt_ext              = from->virt_ext;
3095 3096
}

3097
static int nested_svm_vmexit(struct vcpu_svm *svm)
3098
{
3099
	struct vmcb *nested_vmcb;
3100
	struct vmcb *hsave = svm->nested.hsave;
J
Joerg Roedel 已提交
3101
	struct vmcb *vmcb = svm->vmcb;
3102
	struct page *page;
3103

3104 3105 3106 3107
	trace_kvm_nested_vmexit_inject(vmcb->control.exit_code,
				       vmcb->control.exit_info_1,
				       vmcb->control.exit_info_2,
				       vmcb->control.exit_int_info,
3108 3109
				       vmcb->control.exit_int_info_err,
				       KVM_ISA_SVM);
3110

3111
	nested_vmcb = nested_svm_map(svm, svm->nested.vmcb, &page);
3112 3113 3114
	if (!nested_vmcb)
		return 1;

3115 3116
	/* Exit Guest-Mode */
	leave_guest_mode(&svm->vcpu);
3117 3118
	svm->nested.vmcb = 0;

3119
	/* Give the current vmcb to the guest */
J
Joerg Roedel 已提交
3120 3121 3122 3123 3124 3125 3126 3127
	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;
3128
	nested_vmcb->save.efer   = svm->vcpu.arch.efer;
3129
	nested_vmcb->save.cr0    = kvm_read_cr0(&svm->vcpu);
3130
	nested_vmcb->save.cr3    = kvm_read_cr3(&svm->vcpu);
J
Joerg Roedel 已提交
3131
	nested_vmcb->save.cr2    = vmcb->save.cr2;
3132
	nested_vmcb->save.cr4    = svm->vcpu.arch.cr4;
3133
	nested_vmcb->save.rflags = kvm_get_rflags(&svm->vcpu);
J
Joerg Roedel 已提交
3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149
	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;
3150 3151 3152

	if (svm->nrips_enabled)
		nested_vmcb->control.next_rip  = vmcb->control.next_rip;
3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168

	/*
	 * 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
3169 3170 3171
	nested_vmcb->control.tlb_ctl           = 0;
	nested_vmcb->control.event_inj         = 0;
	nested_vmcb->control.event_inj_err     = 0;
3172 3173 3174 3175 3176 3177

	/* 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 */
3178
	copy_vmcb_control_area(vmcb, hsave);
3179

3180 3181
	kvm_clear_exception_queue(&svm->vcpu);
	kvm_clear_interrupt_queue(&svm->vcpu);
3182

3183 3184
	svm->nested.nested_cr3 = 0;

3185 3186 3187 3188 3189 3190 3191
	/* 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;
3192
	kvm_set_rflags(&svm->vcpu, hsave->save.rflags);
3193 3194 3195 3196 3197 3198 3199
	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 {
3200
		(void)kvm_set_cr3(&svm->vcpu, hsave->save.cr3);
3201 3202 3203 3204 3205 3206 3207 3208
	}
	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;

3209 3210
	mark_all_dirty(svm->vmcb);

3211
	nested_svm_unmap(page);
3212

3213
	nested_svm_uninit_mmu_context(&svm->vcpu);
3214 3215 3216 3217 3218
	kvm_mmu_reset_context(&svm->vcpu);
	kvm_mmu_load(&svm->vcpu);

	return 0;
}
A
Alexander Graf 已提交
3219

3220
static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
A
Alexander Graf 已提交
3221
{
3222 3223
	/*
	 * This function merges the msr permission bitmaps of kvm and the
G
Guo Chao 已提交
3224
	 * nested vmcb. It is optimized in that it only merges the parts where
3225 3226
	 * the kvm msr permission bitmap may contain zero bits
	 */
A
Alexander Graf 已提交
3227
	int i;
3228

3229 3230
	if (!(svm->nested.intercept & (1ULL << INTERCEPT_MSR_PROT)))
		return true;
3231

3232 3233 3234
	for (i = 0; i < MSRPM_OFFSETS; i++) {
		u32 value, p;
		u64 offset;
3235

3236 3237
		if (msrpm_offsets[i] == 0xffffffff)
			break;
A
Alexander Graf 已提交
3238

3239 3240
		p      = msrpm_offsets[i];
		offset = svm->nested.vmcb_msrpm + (p * 4);
3241

3242
		if (kvm_vcpu_read_guest(&svm->vcpu, offset, &value, 4))
3243 3244 3245 3246
			return false;

		svm->nested.msrpm[p] = svm->msrpm[p] | value;
	}
A
Alexander Graf 已提交
3247

3248
	svm->vmcb->control.msrpm_base_pa = __sme_set(__pa(svm->nested.msrpm));
3249 3250

	return true;
A
Alexander Graf 已提交
3251 3252
}

3253 3254 3255 3256 3257
static bool nested_vmcb_checks(struct vmcb *vmcb)
{
	if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
		return false;

3258 3259 3260
	if (vmcb->control.asid == 0)
		return false;

3261 3262
	if ((vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) &&
	    !npt_enabled)
3263 3264
		return false;

3265 3266 3267
	return true;
}

L
Ladi Prosek 已提交
3268 3269
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
3270
{
3271
	if (kvm_get_rflags(&svm->vcpu) & X86_EFLAGS_IF)
A
Alexander Graf 已提交
3272 3273 3274 3275
		svm->vcpu.arch.hflags |= HF_HIF_MASK;
	else
		svm->vcpu.arch.hflags &= ~HF_HIF_MASK;

3276
	if (nested_vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE) {
3277 3278 3279 3280 3281
		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
3282 3283 3284 3285 3286 3287 3288
	/* 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;
3289
	kvm_set_rflags(&svm->vcpu, nested_vmcb->save.rflags);
A
Alexander Graf 已提交
3290 3291 3292 3293 3294 3295
	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;
3296
	} else
3297
		(void)kvm_set_cr3(&svm->vcpu, nested_vmcb->save.cr3);
3298 3299 3300 3301

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

J
Joerg Roedel 已提交
3302
	svm->vmcb->save.cr2 = svm->vcpu.arch.cr2 = nested_vmcb->save.cr2;
A
Alexander Graf 已提交
3303 3304 3305
	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
3306

A
Alexander Graf 已提交
3307 3308 3309 3310 3311 3312 3313 3314
	/* 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;

3315
	svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
3316
	svm->nested.vmcb_iopm  = nested_vmcb->control.iopm_base_pa  & ~0x0fffULL;
A
Alexander Graf 已提交
3317

J
Joerg Roedel 已提交
3318
	/* cache intercepts */
3319
	svm->nested.intercept_cr         = nested_vmcb->control.intercept_cr;
3320
	svm->nested.intercept_dr         = nested_vmcb->control.intercept_dr;
J
Joerg Roedel 已提交
3321 3322 3323
	svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
	svm->nested.intercept            = nested_vmcb->control.intercept;

3324
	svm_flush_tlb(&svm->vcpu, true);
A
Alexander Graf 已提交
3325 3326 3327 3328 3329 3330
	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;

3331 3332
	if (svm->vcpu.arch.hflags & HF_VINTR_MASK) {
		/* We only want the cr8 intercept bits of the guest */
3333 3334
		clr_cr_intercept(svm, INTERCEPT_CR8_READ);
		clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);
3335 3336
	}

3337
	/* We don't want to see VMMCALLs from a nested guest */
3338
	clr_intercept(svm, INTERCEPT_VMMCALL);
3339

3340
	svm->vmcb->control.virt_ext = nested_vmcb->control.virt_ext;
A
Alexander Graf 已提交
3341 3342 3343 3344 3345 3346
	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;

3347
	nested_svm_unmap(page);
3348

3349 3350 3351
	/* Enter Guest-Mode */
	enter_guest_mode(&svm->vcpu);

3352 3353 3354 3355 3356 3357
	/*
	 * Merge guest and host intercepts - must be called  with vcpu in
	 * guest-mode to take affect here
	 */
	recalc_intercepts(svm);

3358
	svm->nested.vmcb = vmcb_gpa;
3359

3360
	enable_gif(svm);
A
Alexander Graf 已提交
3361

3362
	mark_all_dirty(svm->vmcb);
L
Ladi Prosek 已提交
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 3428 3429
}

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);
3430

3431
	return true;
A
Alexander Graf 已提交
3432 3433
}

3434
static void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb)
3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449
{
	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
3450
static int vmload_interception(struct vcpu_svm *svm)
3451
{
3452
	struct vmcb *nested_vmcb;
3453
	struct page *page;
3454
	int ret;
3455

3456 3457 3458
	if (nested_svm_check_permissions(svm))
		return 1;

3459
	nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
3460 3461 3462
	if (!nested_vmcb)
		return 1;

3463
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3464
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3465

3466
	nested_svm_vmloadsave(nested_vmcb, svm->vmcb);
3467
	nested_svm_unmap(page);
3468

3469
	return ret;
3470 3471
}

A
Avi Kivity 已提交
3472
static int vmsave_interception(struct vcpu_svm *svm)
3473
{
3474
	struct vmcb *nested_vmcb;
3475
	struct page *page;
3476
	int ret;
3477

3478 3479 3480
	if (nested_svm_check_permissions(svm))
		return 1;

3481
	nested_vmcb = nested_svm_map(svm, svm->vmcb->save.rax, &page);
3482 3483 3484
	if (!nested_vmcb)
		return 1;

3485
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3486
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3487

3488
	nested_svm_vmloadsave(svm->vmcb, nested_vmcb);
3489
	nested_svm_unmap(page);
3490

3491
	return ret;
3492 3493
}

A
Avi Kivity 已提交
3494
static int vmrun_interception(struct vcpu_svm *svm)
A
Alexander Graf 已提交
3495 3496 3497 3498
{
	if (nested_svm_check_permissions(svm))
		return 1;

3499 3500
	/* Save rip after vmrun instruction */
	kvm_rip_write(&svm->vcpu, kvm_rip_read(&svm->vcpu) + 3);
A
Alexander Graf 已提交
3501

3502
	if (!nested_svm_vmrun(svm))
A
Alexander Graf 已提交
3503 3504
		return 1;

3505
	if (!nested_svm_vmrun_msrpm(svm))
3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517
		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
3518 3519 3520 3521

	return 1;
}

A
Avi Kivity 已提交
3522
static int stgi_interception(struct vcpu_svm *svm)
3523
{
3524 3525
	int ret;

3526 3527 3528
	if (nested_svm_check_permissions(svm))
		return 1;

3529 3530
	/*
	 * If VGIF is enabled, the STGI intercept is only added to
3531
	 * detect the opening of the SMI/NMI window; remove it now.
3532 3533 3534 3535
	 */
	if (vgif_enabled(svm))
		clr_intercept(svm, INTERCEPT_STGI);

3536
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3537
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3538
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3539

3540
	enable_gif(svm);
3541

3542
	return ret;
3543 3544
}

A
Avi Kivity 已提交
3545
static int clgi_interception(struct vcpu_svm *svm)
3546
{
3547 3548
	int ret;

3549 3550 3551 3552
	if (nested_svm_check_permissions(svm))
		return 1;

	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3553
	ret = kvm_skip_emulated_instruction(&svm->vcpu);
3554

3555
	disable_gif(svm);
3556 3557

	/* After a CLGI no interrupts should come */
3558 3559 3560 3561 3562
	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);
	}
3563

3564
	return ret;
3565 3566
}

A
Avi Kivity 已提交
3567
static int invlpga_interception(struct vcpu_svm *svm)
A
Alexander Graf 已提交
3568 3569 3570
{
	struct kvm_vcpu *vcpu = &svm->vcpu;

3571 3572
	trace_kvm_invlpga(svm->vmcb->save.rip, kvm_register_read(&svm->vcpu, VCPU_REGS_RCX),
			  kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
3573

A
Alexander Graf 已提交
3574
	/* Let's treat INVLPGA the same as INVLPG (can be optimized!) */
3575
	kvm_mmu_invlpg(vcpu, kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
A
Alexander Graf 已提交
3576 3577

	svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
3578
	return kvm_skip_emulated_instruction(&svm->vcpu);
A
Alexander Graf 已提交
3579 3580
}

3581 3582
static int skinit_interception(struct vcpu_svm *svm)
{
3583
	trace_kvm_skinit(svm->vmcb->save.rip, kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
3584 3585 3586 3587 3588

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

D
David Kaplan 已提交
3589 3590
static int wbinvd_interception(struct vcpu_svm *svm)
{
3591
	return kvm_emulate_wbinvd(&svm->vcpu);
D
David Kaplan 已提交
3592 3593
}

J
Joerg Roedel 已提交
3594 3595 3596 3597 3598 3599 3600
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;
3601
		return kvm_skip_emulated_instruction(&svm->vcpu);
J
Joerg Roedel 已提交
3602 3603 3604 3605 3606
	}

	return 1;
}

A
Avi Kivity 已提交
3607
static int task_switch_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3608
{
3609
	u16 tss_selector;
3610 3611 3612
	int reason;
	int int_type = svm->vmcb->control.exit_int_info &
		SVM_EXITINTINFO_TYPE_MASK;
3613
	int int_vec = svm->vmcb->control.exit_int_info & SVM_EVTINJ_VEC_MASK;
3614 3615 3616 3617
	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;
3618 3619
	bool has_error_code = false;
	u32 error_code = 0;
3620 3621

	tss_selector = (u16)svm->vmcb->control.exit_info_1;
3622

3623 3624
	if (svm->vmcb->control.exit_info_2 &
	    (1ULL << SVM_EXITINFOSHIFT_TS_REASON_IRET))
3625 3626 3627 3628
		reason = TASK_SWITCH_IRET;
	else if (svm->vmcb->control.exit_info_2 &
		 (1ULL << SVM_EXITINFOSHIFT_TS_REASON_JMP))
		reason = TASK_SWITCH_JMP;
3629
	else if (idt_v)
3630 3631 3632 3633
		reason = TASK_SWITCH_GATE;
	else
		reason = TASK_SWITCH_CALL;

3634 3635 3636 3637 3638 3639
	if (reason == TASK_SWITCH_GATE) {
		switch (type) {
		case SVM_EXITINTINFO_TYPE_NMI:
			svm->vcpu.arch.nmi_injected = false;
			break;
		case SVM_EXITINTINFO_TYPE_EXEPT:
3640 3641 3642 3643 3644 3645
			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;
			}
3646 3647 3648 3649 3650 3651 3652 3653 3654
			kvm_clear_exception_queue(&svm->vcpu);
			break;
		case SVM_EXITINTINFO_TYPE_INTR:
			kvm_clear_interrupt_queue(&svm->vcpu);
			break;
		default:
			break;
		}
	}
3655

3656 3657 3658
	if (reason != TASK_SWITCH_GATE ||
	    int_type == SVM_EXITINTINFO_TYPE_SOFT ||
	    (int_type == SVM_EXITINTINFO_TYPE_EXEPT &&
3659 3660
	     (int_vec == OF_VECTOR || int_vec == BP_VECTOR)))
		skip_emulated_instruction(&svm->vcpu);
3661

3662 3663 3664 3665
	if (int_type != SVM_EXITINTINFO_TYPE_SOFT)
		int_vec = -1;

	if (kvm_task_switch(&svm->vcpu, tss_selector, int_vec, reason,
3666 3667 3668 3669 3670 3671 3672
				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
3673 3674
}

A
Avi Kivity 已提交
3675
static int cpuid_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3676
{
3677
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
3678
	return kvm_emulate_cpuid(&svm->vcpu);
A
Avi Kivity 已提交
3679 3680
}

A
Avi Kivity 已提交
3681
static int iret_interception(struct vcpu_svm *svm)
3682 3683
{
	++svm->vcpu.stat.nmi_window_exits;
3684
	clr_intercept(svm, INTERCEPT_IRET);
3685
	svm->vcpu.arch.hflags |= HF_IRET_MASK;
3686
	svm->nmi_iret_rip = kvm_rip_read(&svm->vcpu);
3687
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
3688 3689 3690
	return 1;
}

A
Avi Kivity 已提交
3691
static int invlpg_interception(struct vcpu_svm *svm)
M
Marcelo Tosatti 已提交
3692
{
3693 3694 3695 3696
	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);
3697
	return kvm_skip_emulated_instruction(&svm->vcpu);
M
Marcelo Tosatti 已提交
3698 3699
}

A
Avi Kivity 已提交
3700
static int emulate_on_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3701
{
3702
	return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;
A
Avi Kivity 已提交
3703 3704
}

B
Brijesh Singh 已提交
3705 3706 3707 3708 3709 3710
static int rsm_interception(struct vcpu_svm *svm)
{
	return x86_emulate_instruction(&svm->vcpu, 0, 0,
				       rsm_ins_bytes, 2) == EMULATE_DONE;
}

A
Avi Kivity 已提交
3711 3712 3713 3714 3715 3716 3717 3718
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);
3719
	return kvm_complete_insn_gp(&svm->vcpu, err);
A
Avi Kivity 已提交
3720 3721
}

3722 3723
static bool check_selective_cr0_intercepted(struct vcpu_svm *svm,
					    unsigned long val)
3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745
{
	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;
}

3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760
#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;
3761 3762 3763 3764
	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;
3765 3766 3767 3768 3769 3770 3771

	err = 0;
	if (cr >= 16) { /* mov to cr */
		cr -= 16;
		val = kvm_register_read(&svm->vcpu, reg);
		switch (cr) {
		case 0:
3772 3773
			if (!check_selective_cr0_intercepted(svm, val))
				err = kvm_set_cr0(&svm->vcpu, val);
3774 3775 3776
			else
				return 1;

3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800
			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:
3801
			val = kvm_read_cr3(&svm->vcpu);
3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815
			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);
	}
3816
	return kvm_complete_insn_gp(&svm->vcpu, err);
3817 3818
}

3819 3820 3821 3822 3823
static int dr_interception(struct vcpu_svm *svm)
{
	int reg, dr;
	unsigned long val;

3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834
	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;
	}

3835 3836 3837 3838 3839 3840 3841
	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 */
3842 3843
		if (!kvm_require_dr(&svm->vcpu, dr - 16))
			return 1;
3844 3845 3846
		val = kvm_register_read(&svm->vcpu, reg);
		kvm_set_dr(&svm->vcpu, dr - 16, val);
	} else {
3847 3848 3849 3850
		if (!kvm_require_dr(&svm->vcpu, dr))
			return 1;
		kvm_get_dr(&svm->vcpu, dr, &val);
		kvm_register_write(&svm->vcpu, reg, val);
3851 3852
	}

3853
	return kvm_skip_emulated_instruction(&svm->vcpu);
3854 3855
}

A
Avi Kivity 已提交
3856
static int cr8_write_interception(struct vcpu_svm *svm)
3857
{
A
Avi Kivity 已提交
3858
	struct kvm_run *kvm_run = svm->vcpu.run;
A
Andre Przywara 已提交
3859
	int r;
A
Avi Kivity 已提交
3860

3861 3862
	u8 cr8_prev = kvm_get_cr8(&svm->vcpu);
	/* instruction emulation calls kvm_set_cr8() */
3863
	r = cr_interception(svm);
3864
	if (lapic_in_kernel(&svm->vcpu))
3865
		return r;
3866
	if (cr8_prev <= kvm_get_cr8(&svm->vcpu))
3867
		return r;
3868 3869 3870 3871
	kvm_run->exit_reason = KVM_EXIT_SET_TPR;
	return 0;
}

3872
static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
A
Avi Kivity 已提交
3873
{
3874 3875
	struct vcpu_svm *svm = to_svm(vcpu);

3876
	switch (msr_info->index) {
3877
	case MSR_IA32_TSC: {
3878
		msr_info->data = svm->vmcb->control.tsc_offset +
3879
			kvm_scale_tsc(vcpu, rdtsc());
3880

A
Avi Kivity 已提交
3881 3882
		break;
	}
B
Brian Gerst 已提交
3883
	case MSR_STAR:
3884
		msr_info->data = svm->vmcb->save.star;
A
Avi Kivity 已提交
3885
		break;
3886
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
3887
	case MSR_LSTAR:
3888
		msr_info->data = svm->vmcb->save.lstar;
A
Avi Kivity 已提交
3889 3890
		break;
	case MSR_CSTAR:
3891
		msr_info->data = svm->vmcb->save.cstar;
A
Avi Kivity 已提交
3892 3893
		break;
	case MSR_KERNEL_GS_BASE:
3894
		msr_info->data = svm->vmcb->save.kernel_gs_base;
A
Avi Kivity 已提交
3895 3896
		break;
	case MSR_SYSCALL_MASK:
3897
		msr_info->data = svm->vmcb->save.sfmask;
A
Avi Kivity 已提交
3898 3899 3900
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
3901
		msr_info->data = svm->vmcb->save.sysenter_cs;
A
Avi Kivity 已提交
3902 3903
		break;
	case MSR_IA32_SYSENTER_EIP:
3904
		msr_info->data = svm->sysenter_eip;
A
Avi Kivity 已提交
3905 3906
		break;
	case MSR_IA32_SYSENTER_ESP:
3907
		msr_info->data = svm->sysenter_esp;
A
Avi Kivity 已提交
3908
		break;
P
Paolo Bonzini 已提交
3909 3910 3911 3912 3913
	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
3914 3915 3916 3917 3918
	/*
	 * 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.
	 */
3919
	case MSR_IA32_DEBUGCTLMSR:
3920
		msr_info->data = svm->vmcb->save.dbgctl;
3921 3922
		break;
	case MSR_IA32_LASTBRANCHFROMIP:
3923
		msr_info->data = svm->vmcb->save.br_from;
3924 3925
		break;
	case MSR_IA32_LASTBRANCHTOIP:
3926
		msr_info->data = svm->vmcb->save.br_to;
3927 3928
		break;
	case MSR_IA32_LASTINTFROMIP:
3929
		msr_info->data = svm->vmcb->save.last_excp_from;
3930 3931
		break;
	case MSR_IA32_LASTINTTOIP:
3932
		msr_info->data = svm->vmcb->save.last_excp_to;
3933
		break;
A
Alexander Graf 已提交
3934
	case MSR_VM_HSAVE_PA:
3935
		msr_info->data = svm->nested.hsave_msr;
A
Alexander Graf 已提交
3936
		break;
3937
	case MSR_VM_CR:
3938
		msr_info->data = svm->nested.vm_cr_msr;
3939
		break;
3940 3941 3942 3943 3944 3945 3946
	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;
3947
	case MSR_IA32_UCODE_REV:
3948
		msr_info->data = 0x01000065;
3949
		break;
3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966
	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
3967
	default:
3968
		return kvm_get_msr_common(vcpu, msr_info);
A
Avi Kivity 已提交
3969 3970 3971 3972
	}
	return 0;
}

A
Avi Kivity 已提交
3973
static int rdmsr_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
3974
{
3975
	u32 ecx = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);
3976
	struct msr_data msr_info;
A
Avi Kivity 已提交
3977

3978 3979 3980
	msr_info.index = ecx;
	msr_info.host_initiated = false;
	if (svm_get_msr(&svm->vcpu, &msr_info)) {
3981
		trace_kvm_msr_read_ex(ecx);
3982
		kvm_inject_gp(&svm->vcpu, 0);
3983
		return 1;
3984
	} else {
3985
		trace_kvm_msr_read(ecx, msr_info.data);
3986

3987 3988 3989 3990
		kvm_register_write(&svm->vcpu, VCPU_REGS_RAX,
				   msr_info.data & 0xffffffff);
		kvm_register_write(&svm->vcpu, VCPU_REGS_RDX,
				   msr_info.data >> 32);
3991
		svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
3992
		return kvm_skip_emulated_instruction(&svm->vcpu);
A
Avi Kivity 已提交
3993 3994 3995
	}
}

3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020
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;
}

4021
static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
A
Avi Kivity 已提交
4022
{
4023 4024
	struct vcpu_svm *svm = to_svm(vcpu);

4025 4026
	u32 ecx = msr->index;
	u64 data = msr->data;
A
Avi Kivity 已提交
4027
	switch (ecx) {
P
Paolo Bonzini 已提交
4028 4029 4030 4031 4032 4033 4034
	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;
4035
	case MSR_IA32_TSC:
4036
		kvm_write_tsc(vcpu, msr);
A
Avi Kivity 已提交
4037
		break;
4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064
	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
4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080
	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
4081
	case MSR_STAR:
4082
		svm->vmcb->save.star = data;
A
Avi Kivity 已提交
4083
		break;
4084
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
4085
	case MSR_LSTAR:
4086
		svm->vmcb->save.lstar = data;
A
Avi Kivity 已提交
4087 4088
		break;
	case MSR_CSTAR:
4089
		svm->vmcb->save.cstar = data;
A
Avi Kivity 已提交
4090 4091
		break;
	case MSR_KERNEL_GS_BASE:
4092
		svm->vmcb->save.kernel_gs_base = data;
A
Avi Kivity 已提交
4093 4094
		break;
	case MSR_SYSCALL_MASK:
4095
		svm->vmcb->save.sfmask = data;
A
Avi Kivity 已提交
4096 4097 4098
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
4099
		svm->vmcb->save.sysenter_cs = data;
A
Avi Kivity 已提交
4100 4101
		break;
	case MSR_IA32_SYSENTER_EIP:
4102
		svm->sysenter_eip = data;
4103
		svm->vmcb->save.sysenter_eip = data;
A
Avi Kivity 已提交
4104 4105
		break;
	case MSR_IA32_SYSENTER_ESP:
4106
		svm->sysenter_esp = data;
4107
		svm->vmcb->save.sysenter_esp = data;
A
Avi Kivity 已提交
4108
		break;
P
Paolo Bonzini 已提交
4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120
	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;
4121
	case MSR_IA32_DEBUGCTLMSR:
4122
		if (!boot_cpu_has(X86_FEATURE_LBRV)) {
4123 4124
			vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
				    __func__, data);
4125 4126 4127 4128 4129 4130
			break;
		}
		if (data & DEBUGCTL_RESERVED_BITS)
			return 1;

		svm->vmcb->save.dbgctl = data;
4131
		mark_dirty(svm->vmcb, VMCB_LBR);
4132 4133 4134 4135
		if (data & (1ULL<<0))
			svm_enable_lbrv(svm);
		else
			svm_disable_lbrv(svm);
4136
		break;
A
Alexander Graf 已提交
4137
	case MSR_VM_HSAVE_PA:
4138
		svm->nested.hsave_msr = data;
4139
		break;
4140
	case MSR_VM_CR:
4141
		return svm_set_vm_cr(vcpu, data);
4142
	case MSR_VM_IGNNE:
4143
		vcpu_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data);
4144
		break;
4145 4146 4147 4148
	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
4149
	default:
4150
		return kvm_set_msr_common(vcpu, msr);
A
Avi Kivity 已提交
4151 4152 4153 4154
	}
	return 0;
}

A
Avi Kivity 已提交
4155
static int wrmsr_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
4156
{
4157
	struct msr_data msr;
4158 4159
	u32 ecx = kvm_register_read(&svm->vcpu, VCPU_REGS_RCX);
	u64 data = kvm_read_edx_eax(&svm->vcpu);
4160

4161 4162 4163
	msr.data = data;
	msr.index = ecx;
	msr.host_initiated = false;
4164

4165
	svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
4166
	if (kvm_set_msr(&svm->vcpu, &msr)) {
4167
		trace_kvm_msr_write_ex(ecx, data);
4168
		kvm_inject_gp(&svm->vcpu, 0);
4169
		return 1;
4170 4171
	} else {
		trace_kvm_msr_write(ecx, data);
4172
		return kvm_skip_emulated_instruction(&svm->vcpu);
4173
	}
A
Avi Kivity 已提交
4174 4175
}

A
Avi Kivity 已提交
4176
static int msr_interception(struct vcpu_svm *svm)
A
Avi Kivity 已提交
4177
{
R
Rusty Russell 已提交
4178
	if (svm->vmcb->control.exit_info_1)
A
Avi Kivity 已提交
4179
		return wrmsr_interception(svm);
A
Avi Kivity 已提交
4180
	else
A
Avi Kivity 已提交
4181
		return rdmsr_interception(svm);
A
Avi Kivity 已提交
4182 4183
}

A
Avi Kivity 已提交
4184
static int interrupt_window_interception(struct vcpu_svm *svm)
4185
{
4186
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
4187
	svm_clear_vintr(svm);
4188
	svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;
4189
	mark_dirty(svm->vmcb, VMCB_INTR);
4190
	++svm->vcpu.stat.irq_window_exits;
4191 4192 4193
	return 1;
}

4194 4195
static int pause_interception(struct vcpu_svm *svm)
{
4196 4197 4198 4199
	struct kvm_vcpu *vcpu = &svm->vcpu;
	bool in_kernel = (svm_get_cpl(vcpu) == 0);

	kvm_vcpu_on_spin(vcpu, in_kernel);
4200 4201 4202
	return 1;
}

4203 4204
static int nop_interception(struct vcpu_svm *svm)
{
4205
	return kvm_skip_emulated_instruction(&(svm->vcpu));
4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219
}

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);
}

4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231
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
4232
	u32 index = svm->vmcb->control.exit_info_2 & 0xFF;
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 4484 4485 4486 4487 4488 4489 4490 4491
	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;
}

4492
static int (*const svm_exit_handlers[])(struct vcpu_svm *svm) = {
4493 4494 4495 4496
	[SVM_EXIT_READ_CR0]			= cr_interception,
	[SVM_EXIT_READ_CR3]			= cr_interception,
	[SVM_EXIT_READ_CR4]			= cr_interception,
	[SVM_EXIT_READ_CR8]			= cr_interception,
4497
	[SVM_EXIT_CR0_SEL_WRITE]		= cr_interception,
4498
	[SVM_EXIT_WRITE_CR0]			= cr_interception,
4499 4500
	[SVM_EXIT_WRITE_CR3]			= cr_interception,
	[SVM_EXIT_WRITE_CR4]			= cr_interception,
J
Joerg Roedel 已提交
4501
	[SVM_EXIT_WRITE_CR8]			= cr8_write_interception,
4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517
	[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
4518 4519
	[SVM_EXIT_EXCP_BASE + DB_VECTOR]	= db_interception,
	[SVM_EXIT_EXCP_BASE + BP_VECTOR]	= bp_interception,
4520
	[SVM_EXIT_EXCP_BASE + UD_VECTOR]	= ud_interception,
J
Joerg Roedel 已提交
4521 4522
	[SVM_EXIT_EXCP_BASE + PF_VECTOR]	= pf_interception,
	[SVM_EXIT_EXCP_BASE + MC_VECTOR]	= mc_interception,
4523
	[SVM_EXIT_EXCP_BASE + AC_VECTOR]	= ac_interception,
J
Joerg Roedel 已提交
4524
	[SVM_EXIT_INTR]				= intr_interception,
4525
	[SVM_EXIT_NMI]				= nmi_interception,
A
Avi Kivity 已提交
4526 4527
	[SVM_EXIT_SMI]				= nop_on_interception,
	[SVM_EXIT_INIT]				= nop_on_interception,
4528
	[SVM_EXIT_VINTR]			= interrupt_window_interception,
A
Avi Kivity 已提交
4529
	[SVM_EXIT_RDPMC]			= rdpmc_interception,
A
Avi Kivity 已提交
4530
	[SVM_EXIT_CPUID]			= cpuid_interception,
4531
	[SVM_EXIT_IRET]                         = iret_interception,
4532
	[SVM_EXIT_INVD]                         = emulate_on_interception,
4533
	[SVM_EXIT_PAUSE]			= pause_interception,
A
Avi Kivity 已提交
4534
	[SVM_EXIT_HLT]				= halt_interception,
M
Marcelo Tosatti 已提交
4535
	[SVM_EXIT_INVLPG]			= invlpg_interception,
A
Alexander Graf 已提交
4536
	[SVM_EXIT_INVLPGA]			= invlpga_interception,
J
Joerg Roedel 已提交
4537
	[SVM_EXIT_IOIO]				= io_interception,
A
Avi Kivity 已提交
4538 4539
	[SVM_EXIT_MSR]				= msr_interception,
	[SVM_EXIT_TASK_SWITCH]			= task_switch_interception,
4540
	[SVM_EXIT_SHUTDOWN]			= shutdown_interception,
A
Alexander Graf 已提交
4541
	[SVM_EXIT_VMRUN]			= vmrun_interception,
4542
	[SVM_EXIT_VMMCALL]			= vmmcall_interception,
4543 4544
	[SVM_EXIT_VMLOAD]			= vmload_interception,
	[SVM_EXIT_VMSAVE]			= vmsave_interception,
4545 4546
	[SVM_EXIT_STGI]				= stgi_interception,
	[SVM_EXIT_CLGI]				= clgi_interception,
4547
	[SVM_EXIT_SKINIT]			= skinit_interception,
D
David Kaplan 已提交
4548
	[SVM_EXIT_WBINVD]                       = wbinvd_interception,
4549 4550
	[SVM_EXIT_MONITOR]			= monitor_interception,
	[SVM_EXIT_MWAIT]			= mwait_interception,
J
Joerg Roedel 已提交
4551
	[SVM_EXIT_XSETBV]			= xsetbv_interception,
4552
	[SVM_EXIT_NPF]				= npf_interception,
B
Brijesh Singh 已提交
4553
	[SVM_EXIT_RSM]                          = rsm_interception,
4554 4555
	[SVM_EXIT_AVIC_INCOMPLETE_IPI]		= avic_incomplete_ipi_interception,
	[SVM_EXIT_AVIC_UNACCELERATED_ACCESS]	= avic_unaccelerated_access_interception,
A
Avi Kivity 已提交
4556 4557
};

4558
static void dump_vmcb(struct kvm_vcpu *vcpu)
4559 4560 4561 4562 4563 4564
{
	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");
4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586
	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);
4587
	pr_err("%-20s%016llx\n", "avic_vapic_bar:", control->avic_vapic_bar);
4588 4589
	pr_err("%-20s%08x\n", "event_inj:", control->event_inj);
	pr_err("%-20s%08x\n", "event_inj_err:", control->event_inj_err);
4590
	pr_err("%-20s%lld\n", "virt_ext:", control->virt_ext);
4591
	pr_err("%-20s%016llx\n", "next_rip:", control->next_rip);
4592 4593 4594
	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);
4595
	pr_err("VMCB State Save Area:\n");
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 4628 4629 4630 4631 4632 4633 4634 4635
	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);
4636 4637
	pr_err("cpl:            %d                efer:         %016llx\n",
		save->cpl, save->efer);
4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664
	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);
4665 4666
}

4667 4668 4669 4670 4671 4672 4673 4674
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
4675
static int handle_exit(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
4676
{
4677
	struct vcpu_svm *svm = to_svm(vcpu);
A
Avi Kivity 已提交
4678
	struct kvm_run *kvm_run = vcpu->run;
4679
	u32 exit_code = svm->vmcb->control.exit_code;
A
Avi Kivity 已提交
4680

4681 4682
	trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);

4683
	if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE))
4684 4685 4686
		vcpu->arch.cr0 = svm->vmcb->save.cr0;
	if (npt_enabled)
		vcpu->arch.cr3 = svm->vmcb->save.cr3;
4687

4688 4689 4690 4691 4692 4693 4694
	if (unlikely(svm->nested.exit_required)) {
		nested_svm_vmexit(svm);
		svm->nested.exit_required = false;

		return 1;
	}

4695
	if (is_guest_mode(vcpu)) {
4696 4697
		int vmexit;

4698 4699 4700 4701
		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,
4702 4703
					svm->vmcb->control.exit_int_info_err,
					KVM_ISA_SVM);
4704

4705 4706 4707 4708 4709 4710
		vmexit = nested_svm_exit_special(svm);

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

		if (vmexit == NESTED_EXIT_DONE)
4711 4712 4713
			return 1;
	}

4714 4715
	svm_complete_interrupts(svm);

4716 4717 4718 4719
	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;
4720 4721
		pr_err("KVM: FAILED VMRUN WITH VMCB:\n");
		dump_vmcb(vcpu);
4722 4723 4724
		return 0;
	}

4725
	if (is_external_interrupt(svm->vmcb->control.exit_int_info) &&
4726
	    exit_code != SVM_EXIT_EXCP_BASE + PF_VECTOR &&
4727 4728
	    exit_code != SVM_EXIT_NPF && exit_code != SVM_EXIT_TASK_SWITCH &&
	    exit_code != SVM_EXIT_INTR && exit_code != SVM_EXIT_NMI)
4729
		printk(KERN_ERR "%s: unexpected exit_int_info 0x%x "
A
Avi Kivity 已提交
4730
		       "exit_code 0x%x\n",
4731
		       __func__, svm->vmcb->control.exit_int_info,
A
Avi Kivity 已提交
4732 4733
		       exit_code);

4734
	if (exit_code >= ARRAY_SIZE(svm_exit_handlers)
J
Joe Perches 已提交
4735
	    || !svm_exit_handlers[exit_code]) {
4736
		WARN_ONCE(1, "svm: unexpected exit reason 0x%x\n", exit_code);
4737 4738
		kvm_queue_exception(vcpu, UD_VECTOR);
		return 1;
A
Avi Kivity 已提交
4739 4740
	}

A
Avi Kivity 已提交
4741
	return svm_exit_handlers[exit_code](svm);
A
Avi Kivity 已提交
4742 4743 4744 4745 4746 4747
}

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

4748 4749
	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
4750 4751 4752
	load_TR_desc();
}

4753 4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776
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
4777
static void pre_svm_run(struct vcpu_svm *svm)
A
Avi Kivity 已提交
4778 4779 4780
{
	int cpu = raw_smp_processor_id();

4781
	struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
A
Avi Kivity 已提交
4782

4783 4784 4785
	if (sev_guest(svm->vcpu.kvm))
		return pre_sev_run(svm, cpu);

4786
	/* FIXME: handle wraparound of asid_generation */
4787 4788
	if (svm->asid_generation != sd->asid_generation)
		new_asid(svm, sd);
A
Avi Kivity 已提交
4789 4790
}

4791 4792 4793 4794 4795 4796
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;
4797
	set_intercept(svm, INTERCEPT_IRET);
4798 4799
	++vcpu->stat.nmi_injections;
}
A
Avi Kivity 已提交
4800

4801
static inline void svm_inject_irq(struct vcpu_svm *svm, int irq)
A
Avi Kivity 已提交
4802 4803 4804
{
	struct vmcb_control_area *control;

4805
	/* The following fields are ignored when AVIC is enabled */
R
Rusty Russell 已提交
4806
	control = &svm->vmcb->control;
4807
	control->int_vector = irq;
A
Avi Kivity 已提交
4808 4809 4810
	control->int_ctl &= ~V_INTR_PRIO_MASK;
	control->int_ctl |= V_IRQ_MASK |
		((/*control->int_vector >> 4*/ 0xf) << V_INTR_PRIO_SHIFT);
4811
	mark_dirty(svm->vmcb, VMCB_INTR);
A
Avi Kivity 已提交
4812 4813
}

4814
static void svm_set_irq(struct kvm_vcpu *vcpu)
E
Eddie Dong 已提交
4815 4816 4817
{
	struct vcpu_svm *svm = to_svm(vcpu);

4818
	BUG_ON(!(gif_set(svm)));
4819

4820 4821 4822
	trace_kvm_inj_virq(vcpu->arch.interrupt.nr);
	++vcpu->stat.irq_injections;

4823 4824
	svm->vmcb->control.event_inj = vcpu->arch.interrupt.nr |
		SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR;
E
Eddie Dong 已提交
4825 4826
}

4827 4828 4829 4830 4831
static inline bool svm_nested_virtualize_tpr(struct kvm_vcpu *vcpu)
{
	return is_guest_mode(vcpu) && (vcpu->arch.hflags & HF_VINTR_MASK);
}

4832
static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
4833 4834 4835
{
	struct vcpu_svm *svm = to_svm(vcpu);

4836 4837
	if (svm_nested_virtualize_tpr(vcpu) ||
	    kvm_vcpu_apicv_active(vcpu))
4838 4839
		return;

4840 4841
	clr_cr_intercept(svm, INTERCEPT_CR8_WRITE);

4842
	if (irr == -1)
4843 4844
		return;

4845
	if (tpr >= irr)
4846
		set_cr_intercept(svm, INTERCEPT_CR8_WRITE);
4847
}
4848

4849 4850 4851 4852 4853
static void svm_set_virtual_x2apic_mode(struct kvm_vcpu *vcpu, bool set)
{
	return;
}

4854
static bool svm_get_enable_apicv(struct kvm_vcpu *vcpu)
4855
{
4856
	return avic && irqchip_split(vcpu->kvm);
4857 4858 4859 4860
}

static void svm_hwapic_irr_update(struct kvm_vcpu *vcpu, int max_irr)
{
4861 4862
}

4863
static void svm_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr)
4864
{
4865 4866
}

4867
/* Note: Currently only used by Hyper-V. */
4868
static void svm_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
4869
{
4870 4871 4872
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb;

4873
	if (!kvm_vcpu_apicv_active(&svm->vcpu))
4874 4875 4876 4877
		return;

	vmcb->control.int_ctl &= ~AVIC_ENABLE_MASK;
	mark_dirty(vmcb, VMCB_INTR);
4878 4879
}

4880
static void svm_load_eoi_exitmap(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
4881 4882 4883 4884
{
	return;
}

4885 4886 4887 4888 4889 4890 4891
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,
4892
		       kvm_cpu_get_apicid(vcpu->cpu));
4893 4894 4895 4896
	else
		kvm_vcpu_wake_up(vcpu);
}

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 4978 4979 4980 4981 4982 4983 4984 4985
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);
4986
	vcpu_info->pi_desc_addr = __sme_set(page_to_phys((*svm)->avic_backing_page));
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 5029 5030 5031 5032 5033 5034 5035 5036
	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 */
5037 5038
			pi.base = __sme_set(page_to_phys(svm->avic_backing_page) &
					    AVIC_HPA_MASK);
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 5093 5094 5095 5096 5097 5098 5099 5100
			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;
}

5101 5102 5103 5104
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
5105 5106 5107 5108 5109 5110
	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;
5111 5112
}

J
Jan Kiszka 已提交
5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125
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;
5126
		set_intercept(svm, INTERCEPT_IRET);
J
Jan Kiszka 已提交
5127 5128
	} else {
		svm->vcpu.arch.hflags &= ~HF_NMI_MASK;
5129
		clr_intercept(svm, INTERCEPT_IRET);
J
Jan Kiszka 已提交
5130 5131 5132
	}
}

5133 5134 5135 5136
static int svm_interrupt_allowed(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	struct vmcb *vmcb = svm->vmcb;
5137 5138 5139 5140 5141 5142
	int ret;

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

5143
	ret = !!(kvm_get_rflags(vcpu) & X86_EFLAGS_IF);
5144

5145
	if (is_guest_mode(vcpu))
5146 5147 5148
		return ret && !(svm->vcpu.arch.hflags & HF_VINTR_MASK);

	return ret;
5149 5150
}

5151
static void enable_irq_window(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
5152
{
5153 5154
	struct vcpu_svm *svm = to_svm(vcpu);

5155 5156 5157
	if (kvm_vcpu_apicv_active(vcpu))
		return;

J
Joerg Roedel 已提交
5158 5159 5160 5161
	/*
	 * 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
5162 5163 5164
	 * 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
5165
	 */
5166
	if ((vgif_enabled(svm) || gif_set(svm)) && nested_svm_intr(svm)) {
5167 5168 5169
		svm_set_vintr(svm);
		svm_inject_irq(svm, 0x0);
	}
5170 5171
}

5172
static void enable_nmi_window(struct kvm_vcpu *vcpu)
5173
{
5174
	struct vcpu_svm *svm = to_svm(vcpu);
5175

5176 5177
	if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
	    == HF_NMI_MASK)
5178
		return; /* IRET will cause a vm exit */
5179

5180 5181 5182
	if (!gif_set(svm)) {
		if (vgif_enabled(svm))
			set_intercept(svm, INTERCEPT_STGI);
5183
		return; /* STGI will cause a vm exit */
5184
	}
5185 5186 5187 5188

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

J
Joerg Roedel 已提交
5189 5190 5191 5192
	/*
	 * Something prevents NMI from been injected. Single step over possible
	 * problem (IRET or exception injection or interrupt shadow)
	 */
5193
	svm->nmi_singlestep_guest_rflags = svm_get_rflags(vcpu);
J
Jan Kiszka 已提交
5194
	svm->nmi_singlestep = true;
5195
	svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
5196 5197
}

5198 5199 5200 5201 5202
static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
{
	return 0;
}

5203
static void svm_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa)
5204
{
5205 5206 5207 5208 5209 5210
	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--;
5211 5212
}

5213 5214 5215 5216
static void svm_prepare_guest_switch(struct kvm_vcpu *vcpu)
{
}

5217 5218 5219 5220
static inline void sync_cr8_to_lapic(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);

5221
	if (svm_nested_virtualize_tpr(vcpu))
5222 5223
		return;

5224
	if (!is_cr_intercept(svm, INTERCEPT_CR8_WRITE)) {
5225
		int cr8 = svm->vmcb->control.int_ctl & V_TPR_MASK;
5226
		kvm_set_cr8(vcpu, cr8);
5227 5228 5229
	}
}

5230 5231 5232 5233 5234
static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu)
{
	struct vcpu_svm *svm = to_svm(vcpu);
	u64 cr8;

5235 5236
	if (svm_nested_virtualize_tpr(vcpu) ||
	    kvm_vcpu_apicv_active(vcpu))
5237 5238
		return;

5239 5240 5241 5242 5243
	cr8 = kvm_get_cr8(vcpu);
	svm->vmcb->control.int_ctl &= ~V_TPR_MASK;
	svm->vmcb->control.int_ctl |= cr8 & V_TPR_MASK;
}

5244 5245 5246 5247 5248
static void svm_complete_interrupts(struct vcpu_svm *svm)
{
	u8 vector;
	int type;
	u32 exitintinfo = svm->vmcb->control.exit_int_info;
5249 5250 5251
	unsigned int3_injected = svm->int3_injected;

	svm->int3_injected = 0;
5252

5253 5254 5255 5256 5257 5258
	/*
	 * 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) {
5259
		svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
5260 5261
		kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
	}
5262

5263 5264 5265 5266 5267 5268 5269
	svm->vcpu.arch.nmi_injected = false;
	kvm_clear_exception_queue(&svm->vcpu);
	kvm_clear_interrupt_queue(&svm->vcpu);

	if (!(exitintinfo & SVM_EXITINTINFO_VALID))
		return;

5270 5271
	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);

5272 5273 5274 5275 5276 5277 5278 5279
	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:
5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290
		/*
		 * 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);
5291
			break;
5292
		}
5293 5294
		if (exitintinfo & SVM_EXITINTINFO_VALID_ERR) {
			u32 err = svm->vmcb->control.exit_int_info_err;
5295
			kvm_requeue_exception_e(&svm->vcpu, vector, err);
5296 5297

		} else
5298
			kvm_requeue_exception(&svm->vcpu, vector);
5299 5300
		break;
	case SVM_EXITINTINFO_TYPE_INTR:
5301
		kvm_queue_interrupt(&svm->vcpu, vector, false);
5302 5303 5304 5305 5306 5307
		break;
	default:
		break;
	}
}

A
Avi Kivity 已提交
5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318
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
5319
static void svm_vcpu_run(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
5320
{
5321
	struct vcpu_svm *svm = to_svm(vcpu);
5322

5323 5324 5325 5326
	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];

5327 5328 5329 5330 5331 5332 5333
	/*
	 * A vmexit emulation is required before the vcpu can be executed
	 * again.
	 */
	if (unlikely(svm->nested.exit_required))
		return;

5334 5335 5336 5337 5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348 5349
	/*
	 * 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
5350
	pre_svm_run(svm);
A
Avi Kivity 已提交
5351

5352 5353
	sync_lapic_to_cr8(vcpu);

5354
	svm->vmcb->save.cr2 = vcpu->arch.cr2;
A
Avi Kivity 已提交
5355

5356 5357 5358
	clgi();

	local_irq_enable();
5359

5360 5361 5362 5363 5364 5365 5366 5367 5368
	/*
	 * 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)
		wrmsrl(MSR_IA32_SPEC_CTRL, svm->spec_ctrl);

A
Avi Kivity 已提交
5369
	asm volatile (
A
Avi Kivity 已提交
5370 5371 5372 5373 5374 5375 5376
		"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"
5377
#ifdef CONFIG_X86_64
R
Rusty Russell 已提交
5378 5379 5380 5381 5382 5383 5384 5385
		"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
5386 5387 5388
#endif

		/* Enter guest mode */
A
Avi Kivity 已提交
5389 5390
		"push %%" _ASM_AX " \n\t"
		"mov %c[vmcb](%[svm]), %%" _ASM_AX " \n\t"
5391 5392 5393
		__ex(SVM_VMLOAD) "\n\t"
		__ex(SVM_VMRUN) "\n\t"
		__ex(SVM_VMSAVE) "\n\t"
A
Avi Kivity 已提交
5394
		"pop %%" _ASM_AX " \n\t"
A
Avi Kivity 已提交
5395 5396

		/* Save guest registers, load host registers */
A
Avi Kivity 已提交
5397 5398 5399 5400 5401 5402
		"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"
5403
#ifdef CONFIG_X86_64
R
Rusty Russell 已提交
5404 5405 5406 5407 5408 5409 5410 5411
		"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"
5412 5413 5414 5415 5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430
#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
5431
#endif
A
Avi Kivity 已提交
5432
		"pop %%" _ASM_BP
A
Avi Kivity 已提交
5433
		:
R
Rusty Russell 已提交
5434
		: [svm]"a"(svm),
A
Avi Kivity 已提交
5435
		  [vmcb]"i"(offsetof(struct vcpu_svm, vmcb_pa)),
5436 5437 5438 5439 5440 5441
		  [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]))
5442
#ifdef CONFIG_X86_64
5443 5444 5445 5446 5447 5448 5449 5450
		  , [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
5451
#endif
5452 5453
		: "cc", "memory"
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
5454
		, "rbx", "rcx", "rdx", "rsi", "rdi"
5455
		, "r8", "r9", "r10", "r11" , "r12", "r13", "r14", "r15"
A
Avi Kivity 已提交
5456 5457
#else
		, "ebx", "ecx", "edx", "esi", "edi"
5458 5459
#endif
		);
A
Avi Kivity 已提交
5460

5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481
	/*
	 * 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))
		rdmsrl(MSR_IA32_SPEC_CTRL, svm->spec_ctrl);

	if (svm->spec_ctrl)
		wrmsrl(MSR_IA32_SPEC_CTRL, 0);

5482 5483 5484
	/* Eliminate branch target predictions from guest mode */
	vmexit_fill_RSB();

5485 5486 5487
#ifdef CONFIG_X86_64
	wrmsrl(MSR_GS_BASE, svm->host.gs_base);
#else
5488
	loadsegment(fs, svm->host.fs);
5489 5490 5491
#ifndef CONFIG_X86_32_LAZY_GS
	loadsegment(gs, svm->host.gs);
#endif
5492
#endif
A
Avi Kivity 已提交
5493 5494 5495

	reload_tss(vcpu);

5496 5497
	local_irq_disable();

5498 5499 5500 5501 5502
	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;

5503 5504 5505 5506 5507 5508 5509 5510 5511 5512
	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);

5513 5514
	sync_cr8_to_lapic(vcpu);

5515
	svm->next_rip = 0;
5516

5517 5518
	svm->vmcb->control.tlb_ctl = TLB_CONTROL_DO_NOTHING;

G
Gleb Natapov 已提交
5519 5520
	/* if exit due to PF check for async PF */
	if (svm->vmcb->control.exit_code == SVM_EXIT_EXCP_BASE + PF_VECTOR)
5521
		svm->vcpu.arch.apf.host_apf_reason = kvm_read_and_reset_pf_reason();
G
Gleb Natapov 已提交
5522

A
Avi Kivity 已提交
5523 5524 5525 5526
	if (npt_enabled) {
		vcpu->arch.regs_avail &= ~(1 << VCPU_EXREG_PDPTR);
		vcpu->arch.regs_dirty &= ~(1 << VCPU_EXREG_PDPTR);
	}
5527 5528 5529 5530 5531 5532 5533 5534

	/*
	 * 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);
5535 5536

	mark_all_clean(svm->vmcb);
A
Avi Kivity 已提交
5537
}
5538
STACK_FRAME_NON_STANDARD(svm_vcpu_run);
A
Avi Kivity 已提交
5539 5540 5541

static void svm_set_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
5542 5543
	struct vcpu_svm *svm = to_svm(vcpu);

5544
	svm->vmcb->save.cr3 = __sme_set(root);
5545
	mark_dirty(svm->vmcb, VMCB_CR);
5546
	svm_flush_tlb(vcpu, true);
A
Avi Kivity 已提交
5547 5548
}

5549 5550 5551 5552
static void set_tdp_cr3(struct kvm_vcpu *vcpu, unsigned long root)
{
	struct vcpu_svm *svm = to_svm(vcpu);

5553
	svm->vmcb->control.nested_cr3 = __sme_set(root);
5554
	mark_dirty(svm->vmcb, VMCB_NPT);
5555 5556

	/* Also sync guest cr3 here in case we live migrate */
5557
	svm->vmcb->save.cr3 = kvm_read_cr3(vcpu);
5558
	mark_dirty(svm->vmcb, VMCB_CR);
5559

5560
	svm_flush_tlb(vcpu, true);
5561 5562
}

A
Avi Kivity 已提交
5563 5564
static int is_disabled(void)
{
5565 5566 5567 5568 5569 5570
	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
5571 5572 5573
	return 0;
}

I
Ingo Molnar 已提交
5574 5575 5576 5577 5578 5579 5580 5581 5582 5583 5584
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
5585 5586 5587 5588 5589
static void svm_check_processor_compat(void *rtn)
{
	*(int *)rtn = 0;
}

5590 5591 5592 5593 5594
static bool svm_cpu_has_accelerated_tpr(void)
{
	return false;
}

5595 5596 5597 5598 5599
static bool svm_has_high_real_mode_segbase(void)
{
	return true;
}

5600 5601 5602 5603 5604
static u64 svm_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
{
	return 0;
}

5605 5606
static void svm_cpuid_update(struct kvm_vcpu *vcpu)
{
5607 5608 5609
	struct vcpu_svm *svm = to_svm(vcpu);

	/* Update nrips enabled cache */
5610
	svm->nrips_enabled = !!guest_cpuid_has(&svm->vcpu, X86_FEATURE_NRIPS);
5611 5612 5613 5614

	if (!kvm_vcpu_apicv_active(vcpu))
		return;

5615
	guest_cpuid_clear(vcpu, X86_FEATURE_X2APIC);
5616 5617
}

5618 5619
static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
{
5620
	switch (func) {
5621 5622 5623 5624
	case 0x1:
		if (avic)
			entry->ecx &= ~bit(X86_FEATURE_X2APIC);
		break;
5625 5626 5627 5628
	case 0x80000001:
		if (nested)
			entry->ecx |= (1 << 2); /* Set SVM bit */
		break;
5629 5630 5631 5632 5633
	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 */
5634 5635 5636 5637
		entry->edx = 0; /* Per default do not support any
				   additional features */

		/* Support next_rip if host supports it */
5638
		if (boot_cpu_has(X86_FEATURE_NRIPS))
5639
			entry->edx |= SVM_FEATURE_NRIP;
5640

5641 5642 5643 5644
		/* Support NPT for the guest if enabled */
		if (npt_enabled)
			entry->edx |= SVM_FEATURE_NPT;

5645
		break;
5646 5647 5648 5649 5650 5651
	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);

5652
	}
5653 5654
}

5655
static int svm_get_lpage_level(void)
5656
{
5657
	return PT_PDPE_LEVEL;
5658 5659
}

5660 5661
static bool svm_rdtscp_supported(void)
{
P
Paolo Bonzini 已提交
5662
	return boot_cpu_has(X86_FEATURE_RDTSCP);
5663 5664
}

5665 5666 5667 5668 5669
static bool svm_invpcid_supported(void)
{
	return false;
}

5670 5671 5672 5673 5674
static bool svm_mpx_supported(void)
{
	return false;
}

5675 5676 5677 5678 5679
static bool svm_xsaves_supported(void)
{
	return false;
}

5680 5681 5682 5683 5684
static bool svm_umip_emulated(void)
{
	return false;
}

5685 5686 5687 5688 5689
static bool svm_has_wbinvd_exit(void)
{
	return true;
}

5690
#define PRE_EX(exit)  { .exit_code = (exit), \
5691
			.stage = X86_ICPT_PRE_EXCEPT, }
5692
#define POST_EX(exit) { .exit_code = (exit), \
5693
			.stage = X86_ICPT_POST_EXCEPT, }
5694
#define POST_MEM(exit) { .exit_code = (exit), \
5695
			.stage = X86_ICPT_POST_MEMACCESS, }
5696

5697
static const struct __x86_intercept {
5698 5699 5700 5701 5702 5703 5704 5705
	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),
5706 5707
	[x86_intercept_dr_read]		= POST_EX(SVM_EXIT_READ_DR0),
	[x86_intercept_dr_write]	= POST_EX(SVM_EXIT_WRITE_DR0),
5708 5709 5710 5711 5712 5713 5714 5715
	[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),
5716 5717 5718 5719 5720 5721 5722 5723
	[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),
5724 5725 5726
	[x86_intercept_rdtscp]		= POST_EX(SVM_EXIT_RDTSCP),
	[x86_intercept_monitor]		= POST_MEM(SVM_EXIT_MONITOR),
	[x86_intercept_mwait]		= POST_EX(SVM_EXIT_MWAIT),
5727 5728 5729 5730 5731 5732 5733 5734 5735
	[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),
5736 5737 5738 5739 5740 5741 5742
	[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),
5743 5744 5745 5746
	[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),
5747 5748
};

5749
#undef PRE_EX
5750
#undef POST_EX
5751
#undef POST_MEM
5752

5753 5754 5755 5756
static int svm_check_intercept(struct kvm_vcpu *vcpu,
			       struct x86_instruction_info *info,
			       enum x86_intercept_stage stage)
{
5757 5758 5759 5760 5761 5762 5763 5764 5765 5766
	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];

5767
	if (stage != icpt_info.stage)
5768 5769 5770 5771 5772 5773 5774 5775 5776 5777 5778 5779 5780 5781
		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;

5782 5783
		if (icpt_info.exit_code != SVM_EXIT_WRITE_CR0 ||
		    info->intercept == x86_intercept_clts)
5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806
			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;
	}
5807 5808 5809 5810
	case SVM_EXIT_READ_DR0:
	case SVM_EXIT_WRITE_DR0:
		icpt_info.exit_code += info->modrm_reg;
		break;
5811 5812 5813 5814 5815 5816
	case SVM_EXIT_MSR:
		if (info->intercept == x86_intercept_wrmsr)
			vmcb->control.exit_info_1 = 1;
		else
			vmcb->control.exit_info_1 = 0;
		break;
5817 5818 5819 5820 5821 5822 5823
	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;
5824
		break;
5825 5826 5827 5828 5829 5830
	case SVM_EXIT_IOIO: {
		u64 exit_info;
		u32 bytes;

		if (info->intercept == x86_intercept_in ||
		    info->intercept == x86_intercept_ins) {
5831 5832
			exit_info = ((info->src_val & 0xffff) << 16) |
				SVM_IOIO_TYPE_MASK;
5833
			bytes = info->dst_bytes;
5834
		} else {
5835
			exit_info = (info->dst_val & 0xffff) << 16;
5836
			bytes = info->src_bytes;
5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856
		}

		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;
	}
5857 5858 5859 5860
	default:
		break;
	}

5861 5862 5863
	/* TODO: Advertise NRIPS to guest hypervisor unconditionally */
	if (static_cpu_has(X86_FEATURE_NRIPS))
		vmcb->control.next_rip  = info->next_rip;
5864 5865 5866 5867 5868 5869 5870 5871
	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;
5872 5873
}

5874 5875 5876
static void svm_handle_external_intr(struct kvm_vcpu *vcpu)
{
	local_irq_enable();
P
Paolo Bonzini 已提交
5877 5878 5879 5880 5881 5882
	/*
	 * We must have an instruction with interrupts enabled, so
	 * the timer interrupt isn't delayed by the interrupt shadow.
	 */
	asm("nop");
	local_irq_disable();
5883 5884
}

5885 5886 5887 5888
static void svm_sched_in(struct kvm_vcpu *vcpu, int cpu)
{
}

5889 5890 5891 5892 5893 5894 5895 5896 5897
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);
}

5898 5899 5900 5901 5902 5903
static void svm_setup_mce(struct kvm_vcpu *vcpu)
{
	/* [63:9] are reserved. */
	vcpu->arch.mcg_cap &= 0x1ff;
}

5904 5905
static int svm_smi_allowed(struct kvm_vcpu *vcpu)
{
5906 5907 5908 5909 5910 5911 5912 5913 5914 5915 5916 5917 5918 5919
	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;
	}

5920 5921 5922
	return 1;
}

5923 5924
static int svm_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
{
5925 5926 5927 5928 5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941
	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;
	}
5942 5943 5944 5945 5946
	return 0;
}

static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, u64 smbase)
{
5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970
	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;
5971 5972
}

5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985
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
5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010 6011 6012 6013 6014 6015 6016
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;
6017
	INIT_LIST_HEAD(&sev->regions_list);
B
Brijesh Singh 已提交
6018 6019 6020 6021 6022 6023 6024 6025

	return 0;

e_free:
	__sev_asid_free(asid);
	return ret;
}

6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042 6043 6044 6045 6046 6047 6048 6049 6050
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;
}

6051
static int __sev_issue_cmd(int fd, int id, void *data, int *error)
6052 6053 6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065
{
	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;
}

6066 6067 6068 6069 6070 6071 6072
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);
}

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 6112 6113 6114 6115 6116 6117 6118 6119
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 */
6120
	ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_LAUNCH_START, start, error);
6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148
	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;
}

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 6238 6239 6240 6241 6242 6243 6244 6245
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;
}

6246 6247
static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
6248
	void __user *measure = (void __user *)(uintptr_t)argp->data;
6249 6250 6251
	struct kvm_sev_info *sev = &kvm->arch.sev_info;
	struct sev_data_launch_measure *data;
	struct kvm_sev_launch_measure params;
6252
	void __user *p = NULL;
6253 6254 6255 6256 6257 6258
	void *blob = NULL;
	int ret;

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

6259
	if (copy_from_user(&params, measure, sizeof(params)))
6260 6261 6262 6263 6264 6265 6266 6267 6268 6269
		return -EFAULT;

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

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

6270 6271
	p = (void __user *)(uintptr_t)params.uaddr;
	if (p) {
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
		if (params.len > SEV_FW_BLOB_MAX_SIZE) {
			ret = -EINVAL;
			goto e_free;
		}

		ret = -ENOMEM;
		blob = kmalloc(params.len, GFP_KERNEL);
		if (!blob)
			goto e_free;

		data->address = __psp_pa(blob);
		data->len = params.len;
	}

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

	/*
	 * If we query the session length, FW responded with expected data.
	 */
	if (!params.len)
		goto done;

	if (ret)
		goto e_free_blob;

	if (blob) {
6300
		if (copy_to_user(p, blob, params.len))
6301 6302 6303 6304 6305
			ret = -EFAULT;
	}

done:
	params.len = data->len;
6306
	if (copy_to_user(measure, &params, sizeof(params)))
6307 6308 6309 6310 6311 6312 6313 6314
		ret = -EFAULT;
e_free_blob:
	kfree(blob);
e_free:
	kfree(data);
	return ret;
}

6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334
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;
}

6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349 6350 6351 6352 6353 6354 6355 6356 6357 6358 6359 6360 6361 6362 6363 6364
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;
}

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 6436 6437 6438 6439 6440 6441
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;
}

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 6513 6514 6515 6516 6517 6518
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;
}

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 6565 6566 6567 6568 6569 6570
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);

6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583
		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);
6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598

		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;
}

6599 6600 6601 6602 6603 6604 6605 6606
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;
6607
	int ret, offset;
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

	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;

6633 6634 6635 6636
	offset = params.guest_uaddr & (PAGE_SIZE - 1);
	data->guest_address = __sme_page_pa(pages[0]) + offset;
	data->guest_len = params.guest_len;

6637 6638 6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650
	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;
	}
6651 6652
	data->hdr_address = __psp_pa(hdr);
	data->hdr_len = params.hdr_len;
6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666 6667

	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
6668 6669 6670 6671 6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684
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;
6685 6686 6687
	case KVM_SEV_LAUNCH_START:
		r = sev_launch_start(kvm, &sev_cmd);
		break;
6688 6689 6690
	case KVM_SEV_LAUNCH_UPDATE_DATA:
		r = sev_launch_update_data(kvm, &sev_cmd);
		break;
6691 6692 6693
	case KVM_SEV_LAUNCH_MEASURE:
		r = sev_launch_measure(kvm, &sev_cmd);
		break;
6694 6695 6696
	case KVM_SEV_LAUNCH_FINISH:
		r = sev_launch_finish(kvm, &sev_cmd);
		break;
6697 6698 6699
	case KVM_SEV_GUEST_STATUS:
		r = sev_guest_status(kvm, &sev_cmd);
		break;
6700 6701 6702
	case KVM_SEV_DBG_DECRYPT:
		r = sev_dbg_crypt(kvm, &sev_cmd, true);
		break;
6703 6704 6705
	case KVM_SEV_DBG_ENCRYPT:
		r = sev_dbg_crypt(kvm, &sev_cmd, false);
		break;
6706 6707 6708
	case KVM_SEV_LAUNCH_SECRET:
		r = sev_launch_secret(kvm, &sev_cmd);
		break;
B
Brijesh Singh 已提交
6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721
	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;
}

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 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809
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;
}

6810
static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
A
Avi Kivity 已提交
6811 6812 6813 6814
	.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
6815
	.check_processor_compatibility = svm_check_processor_compat,
A
Avi Kivity 已提交
6816 6817
	.hardware_enable = svm_hardware_enable,
	.hardware_disable = svm_hardware_disable,
6818
	.cpu_has_accelerated_tpr = svm_cpu_has_accelerated_tpr,
6819
	.cpu_has_high_real_mode_segbase = svm_has_high_real_mode_segbase,
A
Avi Kivity 已提交
6820 6821 6822

	.vcpu_create = svm_create_vcpu,
	.vcpu_free = svm_free_vcpu,
6823
	.vcpu_reset = svm_vcpu_reset,
A
Avi Kivity 已提交
6824

6825
	.vm_init = avic_vm_init,
B
Brijesh Singh 已提交
6826
	.vm_destroy = svm_vm_destroy,
6827

6828
	.prepare_guest_switch = svm_prepare_guest_switch,
A
Avi Kivity 已提交
6829 6830
	.vcpu_load = svm_vcpu_load,
	.vcpu_put = svm_vcpu_put,
6831 6832
	.vcpu_blocking = svm_vcpu_blocking,
	.vcpu_unblocking = svm_vcpu_unblocking,
A
Avi Kivity 已提交
6833

6834
	.update_bp_intercept = update_bp_intercept,
A
Avi Kivity 已提交
6835 6836 6837 6838 6839
	.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,
6840
	.get_cpl = svm_get_cpl,
6841
	.get_cs_db_l_bits = kvm_get_cs_db_l_bits,
6842
	.decache_cr0_guest_bits = svm_decache_cr0_guest_bits,
6843
	.decache_cr3 = svm_decache_cr3,
6844
	.decache_cr4_guest_bits = svm_decache_cr4_guest_bits,
A
Avi Kivity 已提交
6845 6846 6847 6848 6849 6850 6851 6852
	.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
6853 6854
	.get_dr6 = svm_get_dr6,
	.set_dr6 = svm_set_dr6,
6855
	.set_dr7 = svm_set_dr7,
6856
	.sync_dirty_debug_regs = svm_sync_dirty_debug_regs,
A
Avi Kivity 已提交
6857
	.cache_reg = svm_cache_reg,
A
Avi Kivity 已提交
6858 6859
	.get_rflags = svm_get_rflags,
	.set_rflags = svm_set_rflags,
6860

A
Avi Kivity 已提交
6861 6862 6863
	.tlb_flush = svm_flush_tlb,

	.run = svm_vcpu_run,
6864
	.handle_exit = handle_exit,
A
Avi Kivity 已提交
6865
	.skip_emulated_instruction = skip_emulated_instruction,
6866 6867
	.set_interrupt_shadow = svm_set_interrupt_shadow,
	.get_interrupt_shadow = svm_get_interrupt_shadow,
I
Ingo Molnar 已提交
6868
	.patch_hypercall = svm_patch_hypercall,
E
Eddie Dong 已提交
6869
	.set_irq = svm_set_irq,
6870
	.set_nmi = svm_inject_nmi,
6871
	.queue_exception = svm_queue_exception,
A
Avi Kivity 已提交
6872
	.cancel_injection = svm_cancel_injection,
6873
	.interrupt_allowed = svm_interrupt_allowed,
6874
	.nmi_allowed = svm_nmi_allowed,
J
Jan Kiszka 已提交
6875 6876
	.get_nmi_mask = svm_get_nmi_mask,
	.set_nmi_mask = svm_set_nmi_mask,
6877 6878 6879
	.enable_nmi_window = enable_nmi_window,
	.enable_irq_window = enable_irq_window,
	.update_cr8_intercept = update_cr8_intercept,
6880
	.set_virtual_x2apic_mode = svm_set_virtual_x2apic_mode,
6881 6882
	.get_enable_apicv = svm_get_enable_apicv,
	.refresh_apicv_exec_ctrl = svm_refresh_apicv_exec_ctrl,
6883
	.load_eoi_exitmap = svm_load_eoi_exitmap,
6884 6885
	.hwapic_irr_update = svm_hwapic_irr_update,
	.hwapic_isr_update = svm_hwapic_isr_update,
6886
	.sync_pir_to_irr = kvm_lapic_find_highest_irr,
6887
	.apicv_post_state_restore = avic_post_state_restore,
6888 6889

	.set_tss_addr = svm_set_tss_addr,
6890
	.get_tdp_level = get_npt_level,
6891
	.get_mt_mask = svm_get_mt_mask,
6892

6893 6894
	.get_exit_info = svm_get_exit_info,

6895
	.get_lpage_level = svm_get_lpage_level,
6896 6897

	.cpuid_update = svm_cpuid_update,
6898 6899

	.rdtscp_supported = svm_rdtscp_supported,
6900
	.invpcid_supported = svm_invpcid_supported,
6901
	.mpx_supported = svm_mpx_supported,
6902
	.xsaves_supported = svm_xsaves_supported,
6903
	.umip_emulated = svm_umip_emulated,
6904 6905

	.set_supported_cpuid = svm_set_supported_cpuid,
6906 6907

	.has_wbinvd_exit = svm_has_wbinvd_exit,
6908 6909

	.write_tsc_offset = svm_write_tsc_offset,
6910 6911

	.set_tdp_cr3 = set_tdp_cr3,
6912 6913

	.check_intercept = svm_check_intercept,
6914
	.handle_external_intr = svm_handle_external_intr,
6915 6916

	.sched_in = svm_sched_in,
6917 6918

	.pmu_ops = &amd_pmu_ops,
6919
	.deliver_posted_interrupt = svm_deliver_avic_intr,
6920
	.update_pi_irte = svm_update_pi_irte,
6921
	.setup_mce = svm_setup_mce,
6922

6923
	.smi_allowed = svm_smi_allowed,
6924 6925
	.pre_enter_smm = svm_pre_enter_smm,
	.pre_leave_smm = svm_pre_leave_smm,
6926
	.enable_smi_window = enable_smi_window,
B
Brijesh Singh 已提交
6927 6928

	.mem_enc_op = svm_mem_enc_op,
6929 6930
	.mem_enc_reg_region = svm_register_enc_region,
	.mem_enc_unreg_region = svm_unregister_enc_region,
A
Avi Kivity 已提交
6931 6932 6933 6934
};

static int __init svm_init(void)
{
6935
	return kvm_init(&svm_x86_ops, sizeof(struct vcpu_svm),
6936
			__alignof__(struct vcpu_svm), THIS_MODULE);
A
Avi Kivity 已提交
6937 6938 6939 6940
}

static void __exit svm_exit(void)
{
6941
	kvm_exit();
A
Avi Kivity 已提交
6942 6943 6944 6945
}

module_init(svm_init)
module_exit(svm_exit)