vmx.c 97.3 KB
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/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * This module enables machines with Intel VT-x extensions to run virtual
 * machines without emulation or binary translation.
 *
 * Copyright (C) 2006 Qumranet, Inc.
 *
 * Authors:
 *   Avi Kivity   <avi@qumranet.com>
 *   Yaniv Kamay  <yaniv@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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#include "irq.h"
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#include "mmu.h"
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#include <linux/kvm_host.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
#include <linux/highmem.h>
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#include <linux/sched.h>
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#include <linux/moduleparam.h>
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#include "kvm_cache_regs.h"
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#include "x86.h"
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#include <asm/io.h>
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#include <asm/desc.h>
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#include <asm/vmx.h>
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#include <asm/virtext.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 int bypass_guest_pf = 1;
module_param(bypass_guest_pf, bool, 0);

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static int enable_vpid = 1;
module_param(enable_vpid, bool, 0);

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static int flexpriority_enabled = 1;
module_param(flexpriority_enabled, bool, 0);

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static int enable_ept = 1;
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module_param(enable_ept, bool, 0);

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static int emulate_invalid_guest_state = 0;
module_param(emulate_invalid_guest_state, bool, 0);

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struct vmcs {
	u32 revision_id;
	u32 abort;
	char data[0];
};

struct vcpu_vmx {
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	struct kvm_vcpu       vcpu;
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	struct list_head      local_vcpus_link;
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	unsigned long         host_rsp;
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	int                   launched;
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	u8                    fail;
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	u32                   idt_vectoring_info;
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	struct kvm_msr_entry *guest_msrs;
	struct kvm_msr_entry *host_msrs;
	int                   nmsrs;
	int                   save_nmsrs;
	int                   msr_offset_efer;
#ifdef CONFIG_X86_64
	int                   msr_offset_kernel_gs_base;
#endif
	struct vmcs          *vmcs;
	struct {
		int           loaded;
		u16           fs_sel, gs_sel, ldt_sel;
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		int           gs_ldt_reload_needed;
		int           fs_reload_needed;
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		int           guest_efer_loaded;
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	} host_state;
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	struct {
		struct {
			bool pending;
			u8 vector;
			unsigned rip;
		} irq;
	} rmode;
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	int vpid;
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	bool emulation_required;
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	enum emulation_result invalid_state_emulation_result;
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	/* Support for vnmi-less CPUs */
	int soft_vnmi_blocked;
	ktime_t entry_time;
	s64 vnmi_blocked_time;
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};

static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
{
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	return container_of(vcpu, struct vcpu_vmx, vcpu);
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}

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static int init_rmode(struct kvm *kvm);
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static u64 construct_eptp(unsigned long root_hpa);
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static DEFINE_PER_CPU(struct vmcs *, vmxarea);
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
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static DEFINE_PER_CPU(struct list_head, vcpus_on_cpu);
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static struct page *vmx_io_bitmap_a;
static struct page *vmx_io_bitmap_b;
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static struct page *vmx_msr_bitmap;
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static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
static DEFINE_SPINLOCK(vmx_vpid_lock);

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static struct vmcs_config {
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	int size;
	int order;
	u32 revision_id;
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	u32 pin_based_exec_ctrl;
	u32 cpu_based_exec_ctrl;
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	u32 cpu_based_2nd_exec_ctrl;
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	u32 vmexit_ctrl;
	u32 vmentry_ctrl;
} vmcs_config;
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static struct vmx_capability {
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	u32 ept;
	u32 vpid;
} vmx_capability;

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#define VMX_SEGMENT_FIELD(seg)					\
	[VCPU_SREG_##seg] = {                                   \
		.selector = GUEST_##seg##_SELECTOR,		\
		.base = GUEST_##seg##_BASE,		   	\
		.limit = GUEST_##seg##_LIMIT,		   	\
		.ar_bytes = GUEST_##seg##_AR_BYTES,	   	\
	}

static struct kvm_vmx_segment_field {
	unsigned selector;
	unsigned base;
	unsigned limit;
	unsigned ar_bytes;
} kvm_vmx_segment_fields[] = {
	VMX_SEGMENT_FIELD(CS),
	VMX_SEGMENT_FIELD(DS),
	VMX_SEGMENT_FIELD(ES),
	VMX_SEGMENT_FIELD(FS),
	VMX_SEGMENT_FIELD(GS),
	VMX_SEGMENT_FIELD(SS),
	VMX_SEGMENT_FIELD(TR),
	VMX_SEGMENT_FIELD(LDTR),
};

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/*
 * Keep MSR_K6_STAR at the end, as setup_msrs() will try to optimize it
 * away by decrementing the array size.
 */
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static const u32 vmx_msr_index[] = {
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#ifdef CONFIG_X86_64
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	MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR, MSR_KERNEL_GS_BASE,
#endif
	MSR_EFER, MSR_K6_STAR,
};
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#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
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static void load_msrs(struct kvm_msr_entry *e, int n)
{
	int i;

	for (i = 0; i < n; ++i)
		wrmsrl(e[i].index, e[i].data);
}

static void save_msrs(struct kvm_msr_entry *e, int n)
{
	int i;

	for (i = 0; i < n; ++i)
		rdmsrl(e[i].index, e[i].data);
}

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static inline int is_page_fault(u32 intr_info)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
			     INTR_INFO_VALID_MASK)) ==
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		(INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
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}

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static inline int is_no_device(u32 intr_info)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
			     INTR_INFO_VALID_MASK)) ==
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		(INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
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}

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static inline int is_invalid_opcode(u32 intr_info)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
			     INTR_INFO_VALID_MASK)) ==
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		(INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
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}

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static inline int is_external_interrupt(u32 intr_info)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
		== (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
}

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static inline int cpu_has_vmx_msr_bitmap(void)
{
	return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS);
}

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static inline int cpu_has_vmx_tpr_shadow(void)
{
	return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW);
}

static inline int vm_need_tpr_shadow(struct kvm *kvm)
{
	return ((cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm)));
}

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static inline int cpu_has_secondary_exec_ctrls(void)
{
	return (vmcs_config.cpu_based_exec_ctrl &
		CPU_BASED_ACTIVATE_SECONDARY_CONTROLS);
}

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static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
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{
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	return flexpriority_enabled
		&& (vmcs_config.cpu_based_2nd_exec_ctrl &
		    SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
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}

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static inline int cpu_has_vmx_invept_individual_addr(void)
{
	return (!!(vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT));
}

static inline int cpu_has_vmx_invept_context(void)
{
	return (!!(vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT));
}

static inline int cpu_has_vmx_invept_global(void)
{
	return (!!(vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT));
}

static inline int cpu_has_vmx_ept(void)
{
	return (vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_ENABLE_EPT);
}

static inline int vm_need_ept(void)
{
	return (cpu_has_vmx_ept() && enable_ept);
}

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static inline int vm_need_virtualize_apic_accesses(struct kvm *kvm)
{
	return ((cpu_has_vmx_virtualize_apic_accesses()) &&
		(irqchip_in_kernel(kvm)));
}

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static inline int cpu_has_vmx_vpid(void)
{
	return (vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_ENABLE_VPID);
}

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static inline int cpu_has_virtual_nmis(void)
{
	return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
}

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static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
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{
	int i;

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	for (i = 0; i < vmx->nmsrs; ++i)
		if (vmx->guest_msrs[i].index == msr)
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			return i;
	return -1;
}

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static inline void __invvpid(int ext, u16 vpid, gva_t gva)
{
    struct {
	u64 vpid : 16;
	u64 rsvd : 48;
	u64 gva;
    } operand = { vpid, 0, gva };

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    asm volatile (__ex(ASM_VMX_INVVPID)
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		  /* CF==1 or ZF==1 --> rc = -1 */
		  "; ja 1f ; ud2 ; 1:"
		  : : "a"(&operand), "c"(ext) : "cc", "memory");
}

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static inline void __invept(int ext, u64 eptp, gpa_t gpa)
{
	struct {
		u64 eptp, gpa;
	} operand = {eptp, gpa};

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	asm volatile (__ex(ASM_VMX_INVEPT)
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			/* CF==1 or ZF==1 --> rc = -1 */
			"; ja 1f ; ud2 ; 1:\n"
			: : "a" (&operand), "c" (ext) : "cc", "memory");
}

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static struct kvm_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
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{
	int i;

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	i = __find_msr_index(vmx, msr);
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	if (i >= 0)
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		return &vmx->guest_msrs[i];
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	return NULL;
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}

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static void vmcs_clear(struct vmcs *vmcs)
{
	u64 phys_addr = __pa(vmcs);
	u8 error;

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	asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
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		      : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
		      : "cc", "memory");
	if (error)
		printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
		       vmcs, phys_addr);
}

static void __vcpu_clear(void *arg)
{
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	struct vcpu_vmx *vmx = arg;
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	int cpu = raw_smp_processor_id();
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	if (vmx->vcpu.cpu == cpu)
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		vmcs_clear(vmx->vmcs);
	if (per_cpu(current_vmcs, cpu) == vmx->vmcs)
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		per_cpu(current_vmcs, cpu) = NULL;
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	rdtscll(vmx->vcpu.arch.host_tsc);
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	list_del(&vmx->local_vcpus_link);
	vmx->vcpu.cpu = -1;
	vmx->launched = 0;
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}

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static void vcpu_clear(struct vcpu_vmx *vmx)
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{
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	if (vmx->vcpu.cpu == -1)
		return;
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	smp_call_function_single(vmx->vcpu.cpu, __vcpu_clear, vmx, 1);
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}

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static inline void vpid_sync_vcpu_all(struct vcpu_vmx *vmx)
{
	if (vmx->vpid == 0)
		return;

	__invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
}

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static inline void ept_sync_global(void)
{
	if (cpu_has_vmx_invept_global())
		__invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
}

static inline void ept_sync_context(u64 eptp)
{
	if (vm_need_ept()) {
		if (cpu_has_vmx_invept_context())
			__invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
		else
			ept_sync_global();
	}
}

static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
{
	if (vm_need_ept()) {
		if (cpu_has_vmx_invept_individual_addr())
			__invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
					eptp, gpa);
		else
			ept_sync_context(eptp);
	}
}

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static unsigned long vmcs_readl(unsigned long field)
{
	unsigned long value;

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	asm volatile (__ex(ASM_VMX_VMREAD_RDX_RAX)
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		      : "=a"(value) : "d"(field) : "cc");
	return value;
}

static u16 vmcs_read16(unsigned long field)
{
	return vmcs_readl(field);
}

static u32 vmcs_read32(unsigned long field)
{
	return vmcs_readl(field);
}

static u64 vmcs_read64(unsigned long field)
{
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#ifdef CONFIG_X86_64
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	return vmcs_readl(field);
#else
	return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
#endif
}

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static noinline void vmwrite_error(unsigned long field, unsigned long value)
{
	printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
	       field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
	dump_stack();
}

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static void vmcs_writel(unsigned long field, unsigned long value)
{
	u8 error;

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	asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
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		       : "=q"(error) : "a"(value), "d"(field) : "cc");
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	if (unlikely(error))
		vmwrite_error(field, value);
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}

static void vmcs_write16(unsigned long field, u16 value)
{
	vmcs_writel(field, value);
}

static void vmcs_write32(unsigned long field, u32 value)
{
	vmcs_writel(field, value);
}

static void vmcs_write64(unsigned long field, u64 value)
{
	vmcs_writel(field, value);
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#ifndef CONFIG_X86_64
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	asm volatile ("");
	vmcs_writel(field+1, value >> 32);
#endif
}

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static void vmcs_clear_bits(unsigned long field, u32 mask)
{
	vmcs_writel(field, vmcs_readl(field) & ~mask);
}

static void vmcs_set_bits(unsigned long field, u32 mask)
{
	vmcs_writel(field, vmcs_readl(field) | mask);
}

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static void update_exception_bitmap(struct kvm_vcpu *vcpu)
{
	u32 eb;

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	eb = (1u << PF_VECTOR) | (1u << UD_VECTOR);
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	if (!vcpu->fpu_active)
		eb |= 1u << NM_VECTOR;
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	if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
		if (vcpu->guest_debug &
		    (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
			eb |= 1u << DB_VECTOR;
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
			eb |= 1u << BP_VECTOR;
	}
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	if (vcpu->arch.rmode.active)
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		eb = ~0;
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	if (vm_need_ept())
		eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
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	vmcs_write32(EXCEPTION_BITMAP, eb);
}

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static void reload_tss(void)
{
	/*
	 * VT restores TR but not its size.  Useless.
	 */
	struct descriptor_table gdt;
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	struct desc_struct *descs;
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	kvm_get_gdt(&gdt);
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	descs = (void *)gdt.base;
	descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
	load_TR_desc();
}

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static void load_transition_efer(struct vcpu_vmx *vmx)
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{
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	int efer_offset = vmx->msr_offset_efer;
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	u64 host_efer = vmx->host_msrs[efer_offset].data;
	u64 guest_efer = vmx->guest_msrs[efer_offset].data;
	u64 ignore_bits;

	if (efer_offset < 0)
		return;
	/*
	 * NX is emulated; LMA and LME handled by hardware; SCE meaninless
	 * outside long mode
	 */
	ignore_bits = EFER_NX | EFER_SCE;
#ifdef CONFIG_X86_64
	ignore_bits |= EFER_LMA | EFER_LME;
	/* SCE is meaningful only in long mode on Intel */
	if (guest_efer & EFER_LMA)
		ignore_bits &= ~(u64)EFER_SCE;
#endif
	if ((guest_efer & ~ignore_bits) == (host_efer & ~ignore_bits))
		return;
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	vmx->host_state.guest_efer_loaded = 1;
	guest_efer &= ~ignore_bits;
	guest_efer |= host_efer & ignore_bits;
	wrmsrl(MSR_EFER, guest_efer);
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	vmx->vcpu.stat.efer_reload++;
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}

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static void reload_host_efer(struct vcpu_vmx *vmx)
{
	if (vmx->host_state.guest_efer_loaded) {
		vmx->host_state.guest_efer_loaded = 0;
		load_msrs(vmx->host_msrs + vmx->msr_offset_efer, 1);
	}
}

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static void vmx_save_host_state(struct kvm_vcpu *vcpu)
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{
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	struct vcpu_vmx *vmx = to_vmx(vcpu);

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	if (vmx->host_state.loaded)
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		return;

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	vmx->host_state.loaded = 1;
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	/*
	 * Set host fs and gs selectors.  Unfortunately, 22.2.3 does not
	 * allow segment selectors with cpl > 0 or ti == 1.
	 */
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	vmx->host_state.ldt_sel = kvm_read_ldt();
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	vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
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	vmx->host_state.fs_sel = kvm_read_fs();
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	if (!(vmx->host_state.fs_sel & 7)) {
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		vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
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		vmx->host_state.fs_reload_needed = 0;
	} else {
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		vmcs_write16(HOST_FS_SELECTOR, 0);
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		vmx->host_state.fs_reload_needed = 1;
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	}
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	vmx->host_state.gs_sel = kvm_read_gs();
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	if (!(vmx->host_state.gs_sel & 7))
		vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
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	else {
		vmcs_write16(HOST_GS_SELECTOR, 0);
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		vmx->host_state.gs_ldt_reload_needed = 1;
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	}

#ifdef CONFIG_X86_64
	vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
	vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
#else
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	vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
	vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
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#endif
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#ifdef CONFIG_X86_64
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	if (is_long_mode(&vmx->vcpu))
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		save_msrs(vmx->host_msrs +
			  vmx->msr_offset_kernel_gs_base, 1);
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593
#endif
594
	load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
595
	load_transition_efer(vmx);
596 597
}

598
static void __vmx_load_host_state(struct vcpu_vmx *vmx)
599
{
600
	unsigned long flags;
601

602
	if (!vmx->host_state.loaded)
603 604
		return;

605
	++vmx->vcpu.stat.host_state_reload;
606
	vmx->host_state.loaded = 0;
607
	if (vmx->host_state.fs_reload_needed)
608
		kvm_load_fs(vmx->host_state.fs_sel);
609
	if (vmx->host_state.gs_ldt_reload_needed) {
610
		kvm_load_ldt(vmx->host_state.ldt_sel);
611 612 613 614
		/*
		 * If we have to reload gs, we must take care to
		 * preserve our gs base.
		 */
615
		local_irq_save(flags);
616
		kvm_load_gs(vmx->host_state.gs_sel);
617 618 619
#ifdef CONFIG_X86_64
		wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
#endif
620
		local_irq_restore(flags);
621
	}
622
	reload_tss();
623 624
	save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
	load_msrs(vmx->host_msrs, vmx->save_nmsrs);
625
	reload_host_efer(vmx);
626 627
}

628 629 630 631 632 633 634
static void vmx_load_host_state(struct vcpu_vmx *vmx)
{
	preempt_disable();
	__vmx_load_host_state(vmx);
	preempt_enable();
}

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/*
 * Switches to specified vcpu, until a matching vcpu_put(), but assumes
 * vcpu mutex is already taken.
 */
639
static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
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640
{
641 642
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	u64 phys_addr = __pa(vmx->vmcs);
643
	u64 tsc_this, delta, new_offset;
A
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644

645
	if (vcpu->cpu != cpu) {
R
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646
		vcpu_clear(vmx);
M
Marcelo Tosatti 已提交
647
		kvm_migrate_timers(vcpu);
648
		vpid_sync_vcpu_all(vmx);
649 650 651 652
		local_irq_disable();
		list_add(&vmx->local_vcpus_link,
			 &per_cpu(vcpus_on_cpu, cpu));
		local_irq_enable();
653
	}
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655
	if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
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656 657
		u8 error;

658
		per_cpu(current_vmcs, cpu) = vmx->vmcs;
659
		asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
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660 661 662 663
			      : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
			      : "cc");
		if (error)
			printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
664
			       vmx->vmcs, phys_addr);
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665 666 667 668 669 670 671 672 673 674 675
	}

	if (vcpu->cpu != cpu) {
		struct descriptor_table dt;
		unsigned long sysenter_esp;

		vcpu->cpu = cpu;
		/*
		 * Linux uses per-cpu TSS and GDT, so set these when switching
		 * processors.
		 */
676 677
		vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
		kvm_get_gdt(&dt);
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		vmcs_writel(HOST_GDTR_BASE, dt.base);   /* 22.2.4 */

		rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
		vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
682 683 684 685 686

		/*
		 * Make sure the time stamp counter is monotonous.
		 */
		rdtscll(tsc_this);
687 688 689 690 691
		if (tsc_this < vcpu->arch.host_tsc) {
			delta = vcpu->arch.host_tsc - tsc_this;
			new_offset = vmcs_read64(TSC_OFFSET) + delta;
			vmcs_write64(TSC_OFFSET, new_offset);
		}
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	}
}

static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
{
697
	__vmx_load_host_state(to_vmx(vcpu));
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}

700 701 702 703 704
static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
{
	if (vcpu->fpu_active)
		return;
	vcpu->fpu_active = 1;
705
	vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
706
	if (vcpu->arch.cr0 & X86_CR0_TS)
707
		vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
708 709 710 711 712 713 714 715
	update_exception_bitmap(vcpu);
}

static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
{
	if (!vcpu->fpu_active)
		return;
	vcpu->fpu_active = 0;
716
	vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
717 718 719
	update_exception_bitmap(vcpu);
}

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static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
{
	return vmcs_readl(GUEST_RFLAGS);
}

static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
727
	if (vcpu->arch.rmode.active)
728
		rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
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	vmcs_writel(GUEST_RFLAGS, rflags);
}

static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
{
	unsigned long rip;
	u32 interruptibility;

737
	rip = kvm_rip_read(vcpu);
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738
	rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
739
	kvm_rip_write(vcpu, rip);
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740 741 742 743 744 745 746 747 748

	/*
	 * We emulated an instruction, so temporary interrupt blocking
	 * should be removed, if set.
	 */
	interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
	if (interruptibility & 3)
		vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
			     interruptibility & ~3);
749
	vcpu->arch.interrupt_window_open = 1;
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}

752 753 754
static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
				bool has_error_code, u32 error_code)
{
755
	struct vcpu_vmx *vmx = to_vmx(vcpu);
756
	u32 intr_info = nr | INTR_INFO_VALID_MASK;
757

758
	if (has_error_code) {
759
		vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
760 761
		intr_info |= INTR_INFO_DELIVER_CODE_MASK;
	}
762 763 764 765 766

	if (vcpu->arch.rmode.active) {
		vmx->rmode.irq.pending = true;
		vmx->rmode.irq.vector = nr;
		vmx->rmode.irq.rip = kvm_rip_read(vcpu);
767
		if (nr == BP_VECTOR || nr == OF_VECTOR)
768
			vmx->rmode.irq.rip++;
769 770
		intr_info |= INTR_TYPE_SOFT_INTR;
		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
771 772 773 774 775
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
		kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
		return;
	}

776 777 778 779 780 781 782
	if (nr == BP_VECTOR || nr == OF_VECTOR) {
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
		intr_info |= INTR_TYPE_SOFT_EXCEPTION;
	} else
		intr_info |= INTR_TYPE_HARD_EXCEPTION;

	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
783 784 785 786
}

static bool vmx_exception_injected(struct kvm_vcpu *vcpu)
{
787
	return false;
788 789
}

790 791 792
/*
 * Swap MSR entry in host/guest MSR entry array.
 */
793
#ifdef CONFIG_X86_64
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794
static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
795
{
796 797 798 799 800 801 802 803
	struct kvm_msr_entry tmp;

	tmp = vmx->guest_msrs[to];
	vmx->guest_msrs[to] = vmx->guest_msrs[from];
	vmx->guest_msrs[from] = tmp;
	tmp = vmx->host_msrs[to];
	vmx->host_msrs[to] = vmx->host_msrs[from];
	vmx->host_msrs[from] = tmp;
804
}
805
#endif
806

807 808 809 810 811
/*
 * Set up the vmcs to automatically save and restore system
 * msrs.  Don't touch the 64-bit msrs if the guest is in legacy
 * mode, as fiddling with msrs is very expensive.
 */
R
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812
static void setup_msrs(struct vcpu_vmx *vmx)
813
{
814
	int save_nmsrs;
815

816
	vmx_load_host_state(vmx);
817 818
	save_nmsrs = 0;
#ifdef CONFIG_X86_64
R
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819
	if (is_long_mode(&vmx->vcpu)) {
820 821
		int index;

R
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822
		index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
823
		if (index >= 0)
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824 825
			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_LSTAR);
826
		if (index >= 0)
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			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_CSTAR);
829
		if (index >= 0)
R
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			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
832
		if (index >= 0)
R
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833
			move_msr_up(vmx, index, save_nmsrs++);
834 835 836 837
		/*
		 * MSR_K6_STAR is only needed on long mode guests, and only
		 * if efer.sce is enabled.
		 */
R
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838
		index = __find_msr_index(vmx, MSR_K6_STAR);
839
		if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE))
R
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840
			move_msr_up(vmx, index, save_nmsrs++);
841 842
	}
#endif
843
	vmx->save_nmsrs = save_nmsrs;
844

845
#ifdef CONFIG_X86_64
846
	vmx->msr_offset_kernel_gs_base =
R
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847
		__find_msr_index(vmx, MSR_KERNEL_GS_BASE);
848
#endif
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849
	vmx->msr_offset_efer = __find_msr_index(vmx, MSR_EFER);
850 851
}

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852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
/*
 * reads and returns guest's timestamp counter "register"
 * guest_tsc = host_tsc + tsc_offset    -- 21.3
 */
static u64 guest_read_tsc(void)
{
	u64 host_tsc, tsc_offset;

	rdtscll(host_tsc);
	tsc_offset = vmcs_read64(TSC_OFFSET);
	return host_tsc + tsc_offset;
}

/*
 * writes 'guest_tsc' into guest's timestamp counter "register"
 * guest_tsc = host_tsc + tsc_offset ==> tsc_offset = guest_tsc - host_tsc
 */
869
static void guest_write_tsc(u64 guest_tsc, u64 host_tsc)
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{
	vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
}

/*
 * Reads an msr value (of 'msr_index') into 'pdata'.
 * Returns 0 on success, non-0 otherwise.
 * Assumes vcpu_load() was already called.
 */
static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
{
	u64 data;
882
	struct kvm_msr_entry *msr;
A
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883 884 885 886 887 888 889

	if (!pdata) {
		printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
		return -EINVAL;
	}

	switch (msr_index) {
890
#ifdef CONFIG_X86_64
A
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	case MSR_FS_BASE:
		data = vmcs_readl(GUEST_FS_BASE);
		break;
	case MSR_GS_BASE:
		data = vmcs_readl(GUEST_GS_BASE);
		break;
	case MSR_EFER:
898
		return kvm_get_msr_common(vcpu, msr_index, pdata);
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899 900 901 902 903 904 905 906
#endif
	case MSR_IA32_TIME_STAMP_COUNTER:
		data = guest_read_tsc();
		break;
	case MSR_IA32_SYSENTER_CS:
		data = vmcs_read32(GUEST_SYSENTER_CS);
		break;
	case MSR_IA32_SYSENTER_EIP:
A
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907
		data = vmcs_readl(GUEST_SYSENTER_EIP);
A
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908 909
		break;
	case MSR_IA32_SYSENTER_ESP:
A
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910
		data = vmcs_readl(GUEST_SYSENTER_ESP);
A
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911 912
		break;
	default:
913
		vmx_load_host_state(to_vmx(vcpu));
R
Rusty Russell 已提交
914
		msr = find_msr_entry(to_vmx(vcpu), msr_index);
915 916 917
		if (msr) {
			data = msr->data;
			break;
A
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918
		}
919
		return kvm_get_msr_common(vcpu, msr_index, pdata);
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	}

	*pdata = data;
	return 0;
}

/*
 * Writes msr value into into the appropriate "register".
 * Returns 0 on success, non-0 otherwise.
 * Assumes vcpu_load() was already called.
 */
static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
{
933 934
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	struct kvm_msr_entry *msr;
935
	u64 host_tsc;
936 937
	int ret = 0;

A
Avi Kivity 已提交
938
	switch (msr_index) {
939
#ifdef CONFIG_X86_64
940
	case MSR_EFER:
941
		vmx_load_host_state(vmx);
942 943
		ret = kvm_set_msr_common(vcpu, msr_index, data);
		break;
A
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944 945 946 947 948 949 950 951 952 953 954
	case MSR_FS_BASE:
		vmcs_writel(GUEST_FS_BASE, data);
		break;
	case MSR_GS_BASE:
		vmcs_writel(GUEST_GS_BASE, data);
		break;
#endif
	case MSR_IA32_SYSENTER_CS:
		vmcs_write32(GUEST_SYSENTER_CS, data);
		break;
	case MSR_IA32_SYSENTER_EIP:
A
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955
		vmcs_writel(GUEST_SYSENTER_EIP, data);
A
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956 957
		break;
	case MSR_IA32_SYSENTER_ESP:
A
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958
		vmcs_writel(GUEST_SYSENTER_ESP, data);
A
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959
		break;
A
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960
	case MSR_IA32_TIME_STAMP_COUNTER:
961 962
		rdtscll(host_tsc);
		guest_write_tsc(data, host_tsc);
963 964 965 966 967 968 969 970 971 972 973 974
		break;
	case MSR_P6_PERFCTR0:
	case MSR_P6_PERFCTR1:
	case MSR_P6_EVNTSEL0:
	case MSR_P6_EVNTSEL1:
		/*
		 * Just discard all writes to the performance counters; this
		 * should keep both older linux and windows 64-bit guests
		 * happy
		 */
		pr_unimpl(vcpu, "unimplemented perfctr wrmsr: 0x%x data 0x%llx\n", msr_index, data);

A
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975
		break;
S
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976 977 978 979 980 981 982
	case MSR_IA32_CR_PAT:
		if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
			vmcs_write64(GUEST_IA32_PAT, data);
			vcpu->arch.pat = data;
			break;
		}
		/* Otherwise falls through to kvm_set_msr_common */
A
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983
	default:
984
		vmx_load_host_state(vmx);
R
Rusty Russell 已提交
985
		msr = find_msr_entry(vmx, msr_index);
986 987 988
		if (msr) {
			msr->data = data;
			break;
A
Avi Kivity 已提交
989
		}
990
		ret = kvm_set_msr_common(vcpu, msr_index, data);
A
Avi Kivity 已提交
991 992
	}

993
	return ret;
A
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994 995
}

996
static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
A
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997
{
998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
	__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
	switch (reg) {
	case VCPU_REGS_RSP:
		vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
		break;
	case VCPU_REGS_RIP:
		vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
		break;
	default:
		break;
	}
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1009 1010
}

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Jan Kiszka 已提交
1011
static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
A
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1012
{
J
Jan Kiszka 已提交
1013 1014
	int old_debug = vcpu->guest_debug;
	unsigned long flags;
A
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1015

J
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1016 1017 1018
	vcpu->guest_debug = dbg->control;
	if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
		vcpu->guest_debug = 0;
A
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1019

1020 1021 1022 1023 1024
	if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
		vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
	else
		vmcs_writel(GUEST_DR7, vcpu->arch.dr7);

J
Jan Kiszka 已提交
1025 1026 1027 1028
	flags = vmcs_readl(GUEST_RFLAGS);
	if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
		flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
	else if (old_debug & KVM_GUESTDBG_SINGLESTEP)
A
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1029
		flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
J
Jan Kiszka 已提交
1030
	vmcs_writel(GUEST_RFLAGS, flags);
A
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1031

1032
	update_exception_bitmap(vcpu);
A
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1033 1034 1035 1036

	return 0;
}

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1037 1038
static int vmx_get_irq(struct kvm_vcpu *vcpu)
{
1039 1040 1041
	if (!vcpu->arch.interrupt.pending)
		return -1;
	return vcpu->arch.interrupt.nr;
E
Eddie Dong 已提交
1042 1043
}

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1044 1045
static __init int cpu_has_kvm_support(void)
{
1046
	return cpu_has_vmx();
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1047 1048 1049 1050 1051 1052 1053
}

static __init int vmx_disabled_by_bios(void)
{
	u64 msr;

	rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
1054 1055 1056
	return (msr & (FEATURE_CONTROL_LOCKED |
		       FEATURE_CONTROL_VMXON_ENABLED))
	    == FEATURE_CONTROL_LOCKED;
1057
	/* locked but not enabled */
A
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1058 1059
}

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1060
static void hardware_enable(void *garbage)
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{
	int cpu = raw_smp_processor_id();
	u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
	u64 old;

1066
	INIT_LIST_HEAD(&per_cpu(vcpus_on_cpu, cpu));
A
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1067
	rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
1068 1069 1070 1071
	if ((old & (FEATURE_CONTROL_LOCKED |
		    FEATURE_CONTROL_VMXON_ENABLED))
	    != (FEATURE_CONTROL_LOCKED |
		FEATURE_CONTROL_VMXON_ENABLED))
A
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1072
		/* enable and lock */
1073
		wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
1074 1075
		       FEATURE_CONTROL_LOCKED |
		       FEATURE_CONTROL_VMXON_ENABLED);
1076
	write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
1077 1078
	asm volatile (ASM_VMX_VMXON_RAX
		      : : "a"(&phys_addr), "m"(phys_addr)
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1079 1080 1081
		      : "memory", "cc");
}

1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
static void vmclear_local_vcpus(void)
{
	int cpu = raw_smp_processor_id();
	struct vcpu_vmx *vmx, *n;

	list_for_each_entry_safe(vmx, n, &per_cpu(vcpus_on_cpu, cpu),
				 local_vcpus_link)
		__vcpu_clear(vmx);
}

1092 1093 1094 1095 1096

/* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
 * tricks.
 */
static void kvm_cpu_vmxoff(void)
A
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1097
{
1098
	asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
1099
	write_cr4(read_cr4() & ~X86_CR4_VMXE);
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1100 1101
}

1102 1103 1104 1105 1106 1107
static void hardware_disable(void *garbage)
{
	vmclear_local_vcpus();
	kvm_cpu_vmxoff();
}

1108
static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
M
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1109
				      u32 msr, u32 *result)
1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120
{
	u32 vmx_msr_low, vmx_msr_high;
	u32 ctl = ctl_min | ctl_opt;

	rdmsr(msr, vmx_msr_low, vmx_msr_high);

	ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
	ctl |= vmx_msr_low;  /* bit == 1 in low word  ==> must be one  */

	/* Ensure minimum (required) set of control bits are supported. */
	if (ctl_min & ~ctl)
Y
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1121
		return -EIO;
1122 1123 1124 1125 1126

	*result = ctl;
	return 0;
}

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1127
static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
A
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1128 1129
{
	u32 vmx_msr_low, vmx_msr_high;
S
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1130
	u32 min, opt, min2, opt2;
1131 1132
	u32 _pin_based_exec_control = 0;
	u32 _cpu_based_exec_control = 0;
1133
	u32 _cpu_based_2nd_exec_control = 0;
1134 1135 1136 1137
	u32 _vmexit_control = 0;
	u32 _vmentry_control = 0;

	min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
1138
	opt = PIN_BASED_VIRTUAL_NMIS;
1139 1140
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
				&_pin_based_exec_control) < 0)
Y
Yang, Sheng 已提交
1141
		return -EIO;
1142 1143 1144 1145 1146 1147

	min = CPU_BASED_HLT_EXITING |
#ifdef CONFIG_X86_64
	      CPU_BASED_CR8_LOAD_EXITING |
	      CPU_BASED_CR8_STORE_EXITING |
#endif
S
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1148 1149
	      CPU_BASED_CR3_LOAD_EXITING |
	      CPU_BASED_CR3_STORE_EXITING |
1150 1151
	      CPU_BASED_USE_IO_BITMAPS |
	      CPU_BASED_MOV_DR_EXITING |
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	      CPU_BASED_USE_TSC_OFFSETING |
	      CPU_BASED_INVLPG_EXITING;
1154
	opt = CPU_BASED_TPR_SHADOW |
S
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1155
	      CPU_BASED_USE_MSR_BITMAPS |
1156
	      CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1157 1158
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
				&_cpu_based_exec_control) < 0)
Y
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1159
		return -EIO;
1160 1161 1162 1163 1164
#ifdef CONFIG_X86_64
	if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
		_cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
					   ~CPU_BASED_CR8_STORE_EXITING;
#endif
1165
	if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
S
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1166 1167
		min2 = 0;
		opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
1168
			SECONDARY_EXEC_WBINVD_EXITING |
S
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1169 1170 1171 1172
			SECONDARY_EXEC_ENABLE_VPID |
			SECONDARY_EXEC_ENABLE_EPT;
		if (adjust_vmx_controls(min2, opt2,
					MSR_IA32_VMX_PROCBASED_CTLS2,
1173 1174 1175 1176 1177 1178 1179 1180
					&_cpu_based_2nd_exec_control) < 0)
			return -EIO;
	}
#ifndef CONFIG_X86_64
	if (!(_cpu_based_2nd_exec_control &
				SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
		_cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
#endif
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1181
	if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
M
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1182 1183
		/* CR3 accesses and invlpg don't need to cause VM Exits when EPT
		   enabled */
S
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1184
		min &= ~(CPU_BASED_CR3_LOAD_EXITING |
M
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1185 1186
			 CPU_BASED_CR3_STORE_EXITING |
			 CPU_BASED_INVLPG_EXITING);
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1187 1188 1189 1190 1191 1192
		if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
					&_cpu_based_exec_control) < 0)
			return -EIO;
		rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
		      vmx_capability.ept, vmx_capability.vpid);
	}
1193 1194 1195 1196 1197

	min = 0;
#ifdef CONFIG_X86_64
	min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
#endif
S
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1198
	opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
1199 1200
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
				&_vmexit_control) < 0)
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1201
		return -EIO;
1202

S
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1203 1204
	min = 0;
	opt = VM_ENTRY_LOAD_IA32_PAT;
1205 1206
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
				&_vmentry_control) < 0)
Y
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1207
		return -EIO;
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N
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1209
	rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
1210 1211 1212

	/* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
	if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
Y
Yang, Sheng 已提交
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		return -EIO;
1214 1215 1216 1217

#ifdef CONFIG_X86_64
	/* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
	if (vmx_msr_high & (1u<<16))
Y
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		return -EIO;
1219 1220 1221 1222
#endif

	/* Require Write-Back (WB) memory type for VMCS accesses. */
	if (((vmx_msr_high >> 18) & 15) != 6)
Y
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1223
		return -EIO;
1224

Y
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1225 1226 1227
	vmcs_conf->size = vmx_msr_high & 0x1fff;
	vmcs_conf->order = get_order(vmcs_config.size);
	vmcs_conf->revision_id = vmx_msr_low;
1228

Y
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1229 1230
	vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
	vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
1231
	vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
Y
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1232 1233
	vmcs_conf->vmexit_ctrl         = _vmexit_control;
	vmcs_conf->vmentry_ctrl        = _vmentry_control;
1234 1235

	return 0;
N
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1236
}
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1237 1238 1239 1240 1241 1242 1243

static struct vmcs *alloc_vmcs_cpu(int cpu)
{
	int node = cpu_to_node(cpu);
	struct page *pages;
	struct vmcs *vmcs;

1244
	pages = alloc_pages_node(node, GFP_KERNEL, vmcs_config.order);
A
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1245 1246 1247
	if (!pages)
		return NULL;
	vmcs = page_address(pages);
1248 1249
	memset(vmcs, 0, vmcs_config.size);
	vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
A
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1250 1251 1252 1253 1254
	return vmcs;
}

static struct vmcs *alloc_vmcs(void)
{
1255
	return alloc_vmcs_cpu(raw_smp_processor_id());
A
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}

static void free_vmcs(struct vmcs *vmcs)
{
1260
	free_pages((unsigned long)vmcs, vmcs_config.order);
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1261 1262
}

1263
static void free_kvm_area(void)
A
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1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290
{
	int cpu;

	for_each_online_cpu(cpu)
		free_vmcs(per_cpu(vmxarea, cpu));
}

static __init int alloc_kvm_area(void)
{
	int cpu;

	for_each_online_cpu(cpu) {
		struct vmcs *vmcs;

		vmcs = alloc_vmcs_cpu(cpu);
		if (!vmcs) {
			free_kvm_area();
			return -ENOMEM;
		}

		per_cpu(vmxarea, cpu) = vmcs;
	}
	return 0;
}

static __init int hardware_setup(void)
{
Y
Yang, Sheng 已提交
1291 1292
	if (setup_vmcs_config(&vmcs_config) < 0)
		return -EIO;
1293 1294 1295 1296

	if (boot_cpu_has(X86_FEATURE_NX))
		kvm_enable_efer_bits(EFER_NX);

A
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1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
	return alloc_kvm_area();
}

static __exit void hardware_unsetup(void)
{
	free_kvm_area();
}

static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

1309
	if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
A
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1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
		vmcs_write16(sf->selector, save->selector);
		vmcs_writel(sf->base, save->base);
		vmcs_write32(sf->limit, save->limit);
		vmcs_write32(sf->ar_bytes, save->ar);
	} else {
		u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
			<< AR_DPL_SHIFT;
		vmcs_write32(sf->ar_bytes, 0x93 | dpl);
	}
}

static void enter_pmode(struct kvm_vcpu *vcpu)
{
	unsigned long flags;
1324
	struct vcpu_vmx *vmx = to_vmx(vcpu);
A
Avi Kivity 已提交
1325

1326
	vmx->emulation_required = 1;
1327
	vcpu->arch.rmode.active = 0;
A
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1328

1329 1330 1331
	vmcs_writel(GUEST_TR_BASE, vcpu->arch.rmode.tr.base);
	vmcs_write32(GUEST_TR_LIMIT, vcpu->arch.rmode.tr.limit);
	vmcs_write32(GUEST_TR_AR_BYTES, vcpu->arch.rmode.tr.ar);
A
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1332 1333

	flags = vmcs_readl(GUEST_RFLAGS);
1334
	flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
1335
	flags |= (vcpu->arch.rmode.save_iopl << IOPL_SHIFT);
A
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1336 1337
	vmcs_writel(GUEST_RFLAGS, flags);

1338 1339
	vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
			(vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
A
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1340 1341 1342

	update_exception_bitmap(vcpu);

1343 1344 1345
	if (emulate_invalid_guest_state)
		return;

1346 1347 1348 1349
	fix_pmode_dataseg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
	fix_pmode_dataseg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
	fix_pmode_dataseg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
	fix_pmode_dataseg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
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1350 1351 1352 1353 1354 1355 1356 1357 1358

	vmcs_write16(GUEST_SS_SELECTOR, 0);
	vmcs_write32(GUEST_SS_AR_BYTES, 0x93);

	vmcs_write16(GUEST_CS_SELECTOR,
		     vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
	vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
}

M
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1359
static gva_t rmode_tss_base(struct kvm *kvm)
A
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1360
{
1361
	if (!kvm->arch.tss_addr) {
1362 1363 1364 1365
		gfn_t base_gfn = kvm->memslots[0].base_gfn +
				 kvm->memslots[0].npages - 3;
		return base_gfn << PAGE_SHIFT;
	}
1366
	return kvm->arch.tss_addr;
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1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
}

static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

	save->selector = vmcs_read16(sf->selector);
	save->base = vmcs_readl(sf->base);
	save->limit = vmcs_read32(sf->limit);
	save->ar = vmcs_read32(sf->ar_bytes);
1377 1378
	vmcs_write16(sf->selector, save->base >> 4);
	vmcs_write32(sf->base, save->base & 0xfffff);
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1379 1380 1381 1382 1383 1384 1385
	vmcs_write32(sf->limit, 0xffff);
	vmcs_write32(sf->ar_bytes, 0xf3);
}

static void enter_rmode(struct kvm_vcpu *vcpu)
{
	unsigned long flags;
1386
	struct vcpu_vmx *vmx = to_vmx(vcpu);
A
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1387

1388
	vmx->emulation_required = 1;
1389
	vcpu->arch.rmode.active = 1;
A
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1390

1391
	vcpu->arch.rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
A
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1392 1393
	vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));

1394
	vcpu->arch.rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
A
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1395 1396
	vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);

1397
	vcpu->arch.rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
A
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1398 1399 1400
	vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);

	flags = vmcs_readl(GUEST_RFLAGS);
1401 1402
	vcpu->arch.rmode.save_iopl
		= (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
A
Avi Kivity 已提交
1403

1404
	flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
A
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1405 1406

	vmcs_writel(GUEST_RFLAGS, flags);
1407
	vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
A
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1408 1409
	update_exception_bitmap(vcpu);

1410 1411 1412
	if (emulate_invalid_guest_state)
		goto continue_rmode;

A
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1413 1414 1415 1416 1417
	vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
	vmcs_write32(GUEST_SS_LIMIT, 0xffff);
	vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);

	vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
1418
	vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1419 1420
	if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
		vmcs_writel(GUEST_CS_BASE, 0xf0000);
A
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1421 1422
	vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);

1423 1424 1425 1426
	fix_rmode_seg(VCPU_SREG_ES, &vcpu->arch.rmode.es);
	fix_rmode_seg(VCPU_SREG_DS, &vcpu->arch.rmode.ds);
	fix_rmode_seg(VCPU_SREG_GS, &vcpu->arch.rmode.gs);
	fix_rmode_seg(VCPU_SREG_FS, &vcpu->arch.rmode.fs);
1427

1428
continue_rmode:
1429
	kvm_mmu_reset_context(vcpu);
1430
	init_rmode(vcpu->kvm);
A
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1431 1432
}

1433
#ifdef CONFIG_X86_64
A
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1434 1435 1436 1437 1438 1439 1440 1441

static void enter_lmode(struct kvm_vcpu *vcpu)
{
	u32 guest_tr_ar;

	guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
	if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
		printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
1442
		       __func__);
A
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1443 1444 1445 1446 1447
		vmcs_write32(GUEST_TR_AR_BYTES,
			     (guest_tr_ar & ~AR_TYPE_MASK)
			     | AR_TYPE_BUSY_64_TSS);
	}

1448
	vcpu->arch.shadow_efer |= EFER_LMA;
A
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1449

R
Rusty Russell 已提交
1450
	find_msr_entry(to_vmx(vcpu), MSR_EFER)->data |= EFER_LMA | EFER_LME;
A
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1451 1452
	vmcs_write32(VM_ENTRY_CONTROLS,
		     vmcs_read32(VM_ENTRY_CONTROLS)
1453
		     | VM_ENTRY_IA32E_MODE);
A
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1454 1455 1456 1457
}

static void exit_lmode(struct kvm_vcpu *vcpu)
{
1458
	vcpu->arch.shadow_efer &= ~EFER_LMA;
A
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1459 1460 1461

	vmcs_write32(VM_ENTRY_CONTROLS,
		     vmcs_read32(VM_ENTRY_CONTROLS)
1462
		     & ~VM_ENTRY_IA32E_MODE);
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1463 1464 1465 1466
}

#endif

1467 1468 1469
static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
{
	vpid_sync_vcpu_all(to_vmx(vcpu));
1470 1471
	if (vm_need_ept())
		ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
1472 1473
}

1474
static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1475
{
1476 1477
	vcpu->arch.cr4 &= KVM_GUEST_CR4_MASK;
	vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
1478 1479
}

1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502
static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
{
	if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
		if (!load_pdptrs(vcpu, vcpu->arch.cr3)) {
			printk(KERN_ERR "EPT: Fail to load pdptrs!\n");
			return;
		}
		vmcs_write64(GUEST_PDPTR0, vcpu->arch.pdptrs[0]);
		vmcs_write64(GUEST_PDPTR1, vcpu->arch.pdptrs[1]);
		vmcs_write64(GUEST_PDPTR2, vcpu->arch.pdptrs[2]);
		vmcs_write64(GUEST_PDPTR3, vcpu->arch.pdptrs[3]);
	}
}

static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);

static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
					unsigned long cr0,
					struct kvm_vcpu *vcpu)
{
	if (!(cr0 & X86_CR0_PG)) {
		/* From paging/starting to nonpaging */
		vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1503
			     vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
1504 1505 1506 1507 1508 1509 1510 1511 1512
			     (CPU_BASED_CR3_LOAD_EXITING |
			      CPU_BASED_CR3_STORE_EXITING));
		vcpu->arch.cr0 = cr0;
		vmx_set_cr4(vcpu, vcpu->arch.cr4);
		*hw_cr0 |= X86_CR0_PE | X86_CR0_PG;
		*hw_cr0 &= ~X86_CR0_WP;
	} else if (!is_paging(vcpu)) {
		/* From nonpaging to paging */
		vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1513
			     vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532
			     ~(CPU_BASED_CR3_LOAD_EXITING |
			       CPU_BASED_CR3_STORE_EXITING));
		vcpu->arch.cr0 = cr0;
		vmx_set_cr4(vcpu, vcpu->arch.cr4);
		if (!(vcpu->arch.cr0 & X86_CR0_WP))
			*hw_cr0 &= ~X86_CR0_WP;
	}
}

static void ept_update_paging_mode_cr4(unsigned long *hw_cr4,
					struct kvm_vcpu *vcpu)
{
	if (!is_paging(vcpu)) {
		*hw_cr4 &= ~X86_CR4_PAE;
		*hw_cr4 |= X86_CR4_PSE;
	} else if (!(vcpu->arch.cr4 & X86_CR4_PAE))
		*hw_cr4 &= ~X86_CR4_PAE;
}

A
Avi Kivity 已提交
1533 1534
static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
1535 1536 1537
	unsigned long hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) |
				KVM_VM_CR0_ALWAYS_ON;

1538 1539
	vmx_fpu_deactivate(vcpu);

1540
	if (vcpu->arch.rmode.active && (cr0 & X86_CR0_PE))
A
Avi Kivity 已提交
1541 1542
		enter_pmode(vcpu);

1543
	if (!vcpu->arch.rmode.active && !(cr0 & X86_CR0_PE))
A
Avi Kivity 已提交
1544 1545
		enter_rmode(vcpu);

1546
#ifdef CONFIG_X86_64
1547
	if (vcpu->arch.shadow_efer & EFER_LME) {
1548
		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
A
Avi Kivity 已提交
1549
			enter_lmode(vcpu);
1550
		if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
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1551 1552 1553 1554
			exit_lmode(vcpu);
	}
#endif

1555 1556 1557
	if (vm_need_ept())
		ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);

A
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1558
	vmcs_writel(CR0_READ_SHADOW, cr0);
1559
	vmcs_writel(GUEST_CR0, hw_cr0);
1560
	vcpu->arch.cr0 = cr0;
1561

1562
	if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
1563
		vmx_fpu_activate(vcpu);
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}

1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577
static u64 construct_eptp(unsigned long root_hpa)
{
	u64 eptp;

	/* TODO write the value reading from MSR */
	eptp = VMX_EPT_DEFAULT_MT |
		VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
	eptp |= (root_hpa & PAGE_MASK);

	return eptp;
}

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1578 1579
static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
	unsigned long guest_cr3;
	u64 eptp;

	guest_cr3 = cr3;
	if (vm_need_ept()) {
		eptp = construct_eptp(cr3);
		vmcs_write64(EPT_POINTER, eptp);
		ept_sync_context(eptp);
		ept_load_pdptrs(vcpu);
		guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
			VMX_EPT_IDENTITY_PAGETABLE_ADDR;
	}

1593
	vmx_flush_tlb(vcpu);
1594
	vmcs_writel(GUEST_CR3, guest_cr3);
1595
	if (vcpu->arch.cr0 & X86_CR0_PE)
1596
		vmx_fpu_deactivate(vcpu);
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1597 1598 1599 1600
}

static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
1601 1602 1603
	unsigned long hw_cr4 = cr4 | (vcpu->arch.rmode.active ?
		    KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);

1604
	vcpu->arch.cr4 = cr4;
1605 1606 1607 1608 1609
	if (vm_need_ept())
		ept_update_paging_mode_cr4(&hw_cr4, vcpu);

	vmcs_writel(CR4_READ_SHADOW, cr4);
	vmcs_writel(GUEST_CR4, hw_cr4);
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1610 1611 1612 1613
}

static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
R
Rusty Russell 已提交
1614 1615
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	struct kvm_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
A
Avi Kivity 已提交
1616

1617
	vcpu->arch.shadow_efer = efer;
1618 1619
	if (!msr)
		return;
A
Avi Kivity 已提交
1620 1621 1622
	if (efer & EFER_LMA) {
		vmcs_write32(VM_ENTRY_CONTROLS,
				     vmcs_read32(VM_ENTRY_CONTROLS) |
1623
				     VM_ENTRY_IA32E_MODE);
A
Avi Kivity 已提交
1624 1625 1626 1627 1628
		msr->data = efer;

	} else {
		vmcs_write32(VM_ENTRY_CONTROLS,
				     vmcs_read32(VM_ENTRY_CONTROLS) &
1629
				     ~VM_ENTRY_IA32E_MODE);
A
Avi Kivity 已提交
1630 1631 1632

		msr->data = efer & ~EFER_LME;
	}
R
Rusty Russell 已提交
1633
	setup_msrs(vmx);
A
Avi Kivity 已提交
1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652
}

static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

	return vmcs_readl(sf->base);
}

static void vmx_get_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
	u32 ar;

	var->base = vmcs_readl(sf->base);
	var->limit = vmcs_read32(sf->limit);
	var->selector = vmcs_read16(sf->selector);
	ar = vmcs_read32(sf->ar_bytes);
1653
	if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
A
Avi Kivity 已提交
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665
		ar = 0;
	var->type = ar & 15;
	var->s = (ar >> 4) & 1;
	var->dpl = (ar >> 5) & 3;
	var->present = (ar >> 7) & 1;
	var->avl = (ar >> 12) & 1;
	var->l = (ar >> 13) & 1;
	var->db = (ar >> 14) & 1;
	var->g = (ar >> 15) & 1;
	var->unusable = (ar >> 16) & 1;
}

1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
static int vmx_get_cpl(struct kvm_vcpu *vcpu)
{
	struct kvm_segment kvm_seg;

	if (!(vcpu->arch.cr0 & X86_CR0_PE)) /* if real mode */
		return 0;

	if (vmx_get_rflags(vcpu) & X86_EFLAGS_VM) /* if virtual 8086 */
		return 3;

	vmx_get_segment(vcpu, &kvm_seg, VCPU_SREG_CS);
	return kvm_seg.selector & 3;
}

1680
static u32 vmx_segment_access_rights(struct kvm_segment *var)
A
Avi Kivity 已提交
1681 1682 1683
{
	u32 ar;

1684
	if (var->unusable)
A
Avi Kivity 已提交
1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695
		ar = 1 << 16;
	else {
		ar = var->type & 15;
		ar |= (var->s & 1) << 4;
		ar |= (var->dpl & 3) << 5;
		ar |= (var->present & 1) << 7;
		ar |= (var->avl & 1) << 12;
		ar |= (var->l & 1) << 13;
		ar |= (var->db & 1) << 14;
		ar |= (var->g & 1) << 15;
	}
1696 1697
	if (ar == 0) /* a 0 value means unusable */
		ar = AR_UNUSABLE_MASK;
1698 1699 1700 1701 1702 1703 1704 1705 1706 1707

	return ar;
}

static void vmx_set_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
	u32 ar;

1708 1709 1710 1711 1712
	if (vcpu->arch.rmode.active && seg == VCPU_SREG_TR) {
		vcpu->arch.rmode.tr.selector = var->selector;
		vcpu->arch.rmode.tr.base = var->base;
		vcpu->arch.rmode.tr.limit = var->limit;
		vcpu->arch.rmode.tr.ar = vmx_segment_access_rights(var);
1713 1714 1715 1716 1717
		return;
	}
	vmcs_writel(sf->base, var->base);
	vmcs_write32(sf->limit, var->limit);
	vmcs_write16(sf->selector, var->selector);
1718
	if (vcpu->arch.rmode.active && var->s) {
1719 1720 1721 1722 1723 1724 1725 1726
		/*
		 * Hack real-mode segments into vm86 compatibility.
		 */
		if (var->base == 0xffff0000 && var->selector == 0xf000)
			vmcs_writel(sf->base, 0xf0000);
		ar = 0xf3;
	} else
		ar = vmx_segment_access_rights(var);
A
Avi Kivity 已提交
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
	vmcs_write32(sf->ar_bytes, ar);
}

static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
{
	u32 ar = vmcs_read32(GUEST_CS_AR_BYTES);

	*db = (ar >> 14) & 1;
	*l = (ar >> 13) & 1;
}

static void vmx_get_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
{
	dt->limit = vmcs_read32(GUEST_IDTR_LIMIT);
	dt->base = vmcs_readl(GUEST_IDTR_BASE);
}

static void vmx_set_idt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
{
	vmcs_write32(GUEST_IDTR_LIMIT, dt->limit);
	vmcs_writel(GUEST_IDTR_BASE, dt->base);
}

static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
{
	dt->limit = vmcs_read32(GUEST_GDTR_LIMIT);
	dt->base = vmcs_readl(GUEST_GDTR_BASE);
}

static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct descriptor_table *dt)
{
	vmcs_write32(GUEST_GDTR_LIMIT, dt->limit);
	vmcs_writel(GUEST_GDTR_BASE, dt->base);
}

1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787
static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
{
	struct kvm_segment var;
	u32 ar;

	vmx_get_segment(vcpu, &var, seg);
	ar = vmx_segment_access_rights(&var);

	if (var.base != (var.selector << 4))
		return false;
	if (var.limit != 0xffff)
		return false;
	if (ar != 0xf3)
		return false;

	return true;
}

static bool code_segment_valid(struct kvm_vcpu *vcpu)
{
	struct kvm_segment cs;
	unsigned int cs_rpl;

	vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
	cs_rpl = cs.selector & SELECTOR_RPL_MASK;

1788 1789
	if (cs.unusable)
		return false;
1790 1791 1792 1793
	if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
		return false;
	if (!cs.s)
		return false;
1794
	if (cs.type & AR_TYPE_WRITEABLE_MASK) {
1795 1796
		if (cs.dpl > cs_rpl)
			return false;
1797
	} else {
1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815
		if (cs.dpl != cs_rpl)
			return false;
	}
	if (!cs.present)
		return false;

	/* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
	return true;
}

static bool stack_segment_valid(struct kvm_vcpu *vcpu)
{
	struct kvm_segment ss;
	unsigned int ss_rpl;

	vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
	ss_rpl = ss.selector & SELECTOR_RPL_MASK;

1816 1817 1818
	if (ss.unusable)
		return true;
	if (ss.type != 3 && ss.type != 7)
1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837
		return false;
	if (!ss.s)
		return false;
	if (ss.dpl != ss_rpl) /* DPL != RPL */
		return false;
	if (!ss.present)
		return false;

	return true;
}

static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
{
	struct kvm_segment var;
	unsigned int rpl;

	vmx_get_segment(vcpu, &var, seg);
	rpl = var.selector & SELECTOR_RPL_MASK;

1838 1839
	if (var.unusable)
		return true;
1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860
	if (!var.s)
		return false;
	if (!var.present)
		return false;
	if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
		if (var.dpl < rpl) /* DPL < RPL */
			return false;
	}

	/* TODO: Add other members to kvm_segment_field to allow checking for other access
	 * rights flags
	 */
	return true;
}

static bool tr_valid(struct kvm_vcpu *vcpu)
{
	struct kvm_segment tr;

	vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);

1861 1862
	if (tr.unusable)
		return false;
1863 1864
	if (tr.selector & SELECTOR_TI_MASK)	/* TI = 1 */
		return false;
1865
	if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878
		return false;
	if (!tr.present)
		return false;

	return true;
}

static bool ldtr_valid(struct kvm_vcpu *vcpu)
{
	struct kvm_segment ldtr;

	vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);

1879 1880
	if (ldtr.unusable)
		return true;
1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951
	if (ldtr.selector & SELECTOR_TI_MASK)	/* TI = 1 */
		return false;
	if (ldtr.type != 2)
		return false;
	if (!ldtr.present)
		return false;

	return true;
}

static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
{
	struct kvm_segment cs, ss;

	vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
	vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);

	return ((cs.selector & SELECTOR_RPL_MASK) ==
		 (ss.selector & SELECTOR_RPL_MASK));
}

/*
 * Check if guest state is valid. Returns true if valid, false if
 * not.
 * We assume that registers are always usable
 */
static bool guest_state_valid(struct kvm_vcpu *vcpu)
{
	/* real mode guest state checks */
	if (!(vcpu->arch.cr0 & X86_CR0_PE)) {
		if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
			return false;
		if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
			return false;
		if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
			return false;
		if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
			return false;
		if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
			return false;
		if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
			return false;
	} else {
	/* protected mode guest state checks */
		if (!cs_ss_rpl_check(vcpu))
			return false;
		if (!code_segment_valid(vcpu))
			return false;
		if (!stack_segment_valid(vcpu))
			return false;
		if (!data_segment_valid(vcpu, VCPU_SREG_DS))
			return false;
		if (!data_segment_valid(vcpu, VCPU_SREG_ES))
			return false;
		if (!data_segment_valid(vcpu, VCPU_SREG_FS))
			return false;
		if (!data_segment_valid(vcpu, VCPU_SREG_GS))
			return false;
		if (!tr_valid(vcpu))
			return false;
		if (!ldtr_valid(vcpu))
			return false;
	}
	/* TODO:
	 * - Add checks on RIP
	 * - Add checks on RFLAGS
	 */

	return true;
}

M
Mike Day 已提交
1952
static int init_rmode_tss(struct kvm *kvm)
A
Avi Kivity 已提交
1953 1954
{
	gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
1955
	u16 data = 0;
1956
	int ret = 0;
1957
	int r;
A
Avi Kivity 已提交
1958

1959 1960
	r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
	if (r < 0)
1961
		goto out;
1962
	data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
1963 1964
	r = kvm_write_guest_page(kvm, fn++, &data,
			TSS_IOPB_BASE_OFFSET, sizeof(u16));
1965
	if (r < 0)
1966
		goto out;
1967 1968
	r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
	if (r < 0)
1969
		goto out;
1970 1971
	r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
	if (r < 0)
1972
		goto out;
1973
	data = ~0;
1974 1975 1976
	r = kvm_write_guest_page(kvm, fn, &data,
				 RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
				 sizeof(u8));
1977
	if (r < 0)
1978 1979 1980 1981 1982
		goto out;

	ret = 1;
out:
	return ret;
A
Avi Kivity 已提交
1983 1984
}

1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
static int init_rmode_identity_map(struct kvm *kvm)
{
	int i, r, ret;
	pfn_t identity_map_pfn;
	u32 tmp;

	if (!vm_need_ept())
		return 1;
	if (unlikely(!kvm->arch.ept_identity_pagetable)) {
		printk(KERN_ERR "EPT: identity-mapping pagetable "
			"haven't been allocated!\n");
		return 0;
	}
	if (likely(kvm->arch.ept_identity_pagetable_done))
		return 1;
	ret = 0;
	identity_map_pfn = VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT;
	r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
	if (r < 0)
		goto out;
	/* Set up identity-mapping pagetable for EPT in real mode */
	for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
		tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
			_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
		r = kvm_write_guest_page(kvm, identity_map_pfn,
				&tmp, i * sizeof(tmp), sizeof(tmp));
		if (r < 0)
			goto out;
	}
	kvm->arch.ept_identity_pagetable_done = true;
	ret = 1;
out:
	return ret;
}

A
Avi Kivity 已提交
2020 2021 2022 2023 2024 2025 2026
static void seg_setup(int seg)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

	vmcs_write16(sf->selector, 0);
	vmcs_writel(sf->base, 0);
	vmcs_write32(sf->limit, 0xffff);
2027
	vmcs_write32(sf->ar_bytes, 0xf3);
A
Avi Kivity 已提交
2028 2029
}

2030 2031 2032 2033 2034
static int alloc_apic_access_page(struct kvm *kvm)
{
	struct kvm_userspace_memory_region kvm_userspace_mem;
	int r = 0;

2035
	down_write(&kvm->slots_lock);
2036
	if (kvm->arch.apic_access_page)
2037 2038 2039 2040 2041 2042 2043 2044
		goto out;
	kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
	kvm_userspace_mem.flags = 0;
	kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
	kvm_userspace_mem.memory_size = PAGE_SIZE;
	r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
	if (r)
		goto out;
2045

2046
	kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
2047
out:
2048
	up_write(&kvm->slots_lock);
2049 2050 2051
	return r;
}

2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074
static int alloc_identity_pagetable(struct kvm *kvm)
{
	struct kvm_userspace_memory_region kvm_userspace_mem;
	int r = 0;

	down_write(&kvm->slots_lock);
	if (kvm->arch.ept_identity_pagetable)
		goto out;
	kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
	kvm_userspace_mem.flags = 0;
	kvm_userspace_mem.guest_phys_addr = VMX_EPT_IDENTITY_PAGETABLE_ADDR;
	kvm_userspace_mem.memory_size = PAGE_SIZE;
	r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
	if (r)
		goto out;

	kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
			VMX_EPT_IDENTITY_PAGETABLE_ADDR >> PAGE_SHIFT);
out:
	up_write(&kvm->slots_lock);
	return r;
}

2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090
static void allocate_vpid(struct vcpu_vmx *vmx)
{
	int vpid;

	vmx->vpid = 0;
	if (!enable_vpid || !cpu_has_vmx_vpid())
		return;
	spin_lock(&vmx_vpid_lock);
	vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
	if (vpid < VMX_NR_VPIDS) {
		vmx->vpid = vpid;
		__set_bit(vpid, vmx_vpid_bitmap);
	}
	spin_unlock(&vmx_vpid_lock);
}

2091
static void vmx_disable_intercept_for_msr(struct page *msr_bitmap, u32 msr)
S
Sheng Yang 已提交
2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114
{
	void *va;

	if (!cpu_has_vmx_msr_bitmap())
		return;

	/*
	 * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
	 * have the write-low and read-high bitmap offsets the wrong way round.
	 * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
	 */
	va = kmap(msr_bitmap);
	if (msr <= 0x1fff) {
		__clear_bit(msr, va + 0x000); /* read-low */
		__clear_bit(msr, va + 0x800); /* write-low */
	} else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
		msr &= 0x1fff;
		__clear_bit(msr, va + 0x400); /* read-high */
		__clear_bit(msr, va + 0xc00); /* write-high */
	}
	kunmap(msr_bitmap);
}

A
Avi Kivity 已提交
2115 2116 2117
/*
 * Sets up the vmcs for emulated real mode.
 */
R
Rusty Russell 已提交
2118
static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
A
Avi Kivity 已提交
2119
{
S
Sheng Yang 已提交
2120
	u32 host_sysenter_cs, msr_low, msr_high;
A
Avi Kivity 已提交
2121
	u32 junk;
2122
	u64 host_pat, tsc_this, tsc_base;
A
Avi Kivity 已提交
2123 2124 2125
	unsigned long a;
	struct descriptor_table dt;
	int i;
2126
	unsigned long kvm_vmx_return;
2127
	u32 exec_control;
A
Avi Kivity 已提交
2128 2129

	/* I/O */
2130 2131
	vmcs_write64(IO_BITMAP_A, page_to_phys(vmx_io_bitmap_a));
	vmcs_write64(IO_BITMAP_B, page_to_phys(vmx_io_bitmap_b));
A
Avi Kivity 已提交
2132

S
Sheng Yang 已提交
2133 2134 2135
	if (cpu_has_vmx_msr_bitmap())
		vmcs_write64(MSR_BITMAP, page_to_phys(vmx_msr_bitmap));

A
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2136 2137 2138
	vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */

	/* Control */
2139 2140
	vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
		vmcs_config.pin_based_exec_ctrl);
2141 2142 2143 2144 2145 2146 2147 2148 2149

	exec_control = vmcs_config.cpu_based_exec_ctrl;
	if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
		exec_control &= ~CPU_BASED_TPR_SHADOW;
#ifdef CONFIG_X86_64
		exec_control |= CPU_BASED_CR8_STORE_EXITING |
				CPU_BASED_CR8_LOAD_EXITING;
#endif
	}
S
Sheng Yang 已提交
2150 2151
	if (!vm_need_ept())
		exec_control |= CPU_BASED_CR3_STORE_EXITING |
2152 2153
				CPU_BASED_CR3_LOAD_EXITING  |
				CPU_BASED_INVLPG_EXITING;
2154
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
A
Avi Kivity 已提交
2155

2156 2157 2158 2159 2160
	if (cpu_has_secondary_exec_ctrls()) {
		exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
		if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
			exec_control &=
				~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
2161 2162
		if (vmx->vpid == 0)
			exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
S
Sheng Yang 已提交
2163 2164
		if (!vm_need_ept())
			exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
2165 2166
		vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
	}
2167

2168 2169
	vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
	vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
A
Avi Kivity 已提交
2170 2171 2172 2173 2174 2175 2176 2177 2178
	vmcs_write32(CR3_TARGET_COUNT, 0);           /* 22.2.1 */

	vmcs_writel(HOST_CR0, read_cr0());  /* 22.2.3 */
	vmcs_writel(HOST_CR4, read_cr4());  /* 22.2.3, 22.2.5 */
	vmcs_writel(HOST_CR3, read_cr3());  /* 22.2.3  FIXME: shadow tables */

	vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS);  /* 22.2.4 */
	vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
	vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
2179 2180
	vmcs_write16(HOST_FS_SELECTOR, kvm_read_fs());    /* 22.2.4 */
	vmcs_write16(HOST_GS_SELECTOR, kvm_read_gs());    /* 22.2.4 */
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Avi Kivity 已提交
2181
	vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
2182
#ifdef CONFIG_X86_64
A
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2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193
	rdmsrl(MSR_FS_BASE, a);
	vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
	rdmsrl(MSR_GS_BASE, a);
	vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
#else
	vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
	vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
#endif

	vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8);  /* 22.2.4 */

2194
	kvm_get_idt(&dt);
A
Avi Kivity 已提交
2195 2196
	vmcs_writel(HOST_IDTR_BASE, dt.base);   /* 22.2.4 */

M
Mike Day 已提交
2197
	asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
2198
	vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
2199 2200 2201
	vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
	vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
A
Avi Kivity 已提交
2202 2203 2204 2205 2206 2207 2208 2209

	rdmsr(MSR_IA32_SYSENTER_CS, host_sysenter_cs, junk);
	vmcs_write32(HOST_IA32_SYSENTER_CS, host_sysenter_cs);
	rdmsrl(MSR_IA32_SYSENTER_ESP, a);
	vmcs_writel(HOST_IA32_SYSENTER_ESP, a);   /* 22.2.3 */
	rdmsrl(MSR_IA32_SYSENTER_EIP, a);
	vmcs_writel(HOST_IA32_SYSENTER_EIP, a);   /* 22.2.3 */

S
Sheng Yang 已提交
2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223
	if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
		rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
		host_pat = msr_low | ((u64) msr_high << 32);
		vmcs_write64(HOST_IA32_PAT, host_pat);
	}
	if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
		rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
		host_pat = msr_low | ((u64) msr_high << 32);
		/* Write the default value follow host pat */
		vmcs_write64(GUEST_IA32_PAT, host_pat);
		/* Keep arch.pat sync with GUEST_IA32_PAT */
		vmx->vcpu.arch.pat = host_pat;
	}

A
Avi Kivity 已提交
2224 2225 2226 2227
	for (i = 0; i < NR_VMX_MSR; ++i) {
		u32 index = vmx_msr_index[i];
		u32 data_low, data_high;
		u64 data;
2228
		int j = vmx->nmsrs;
A
Avi Kivity 已提交
2229 2230 2231

		if (rdmsr_safe(index, &data_low, &data_high) < 0)
			continue;
2232 2233
		if (wrmsr_safe(index, data_low, data_high) < 0)
			continue;
A
Avi Kivity 已提交
2234
		data = data_low | ((u64)data_high << 32);
2235 2236 2237 2238 2239
		vmx->host_msrs[j].index = index;
		vmx->host_msrs[j].reserved = 0;
		vmx->host_msrs[j].data = data;
		vmx->guest_msrs[j] = vmx->host_msrs[j];
		++vmx->nmsrs;
A
Avi Kivity 已提交
2240 2241
	}

2242
	vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
A
Avi Kivity 已提交
2243 2244

	/* 22.2.1, 20.8.1 */
2245 2246
	vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);

2247 2248 2249
	vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
	vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);

2250 2251 2252 2253 2254 2255
	tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc;
	rdtscll(tsc_this);
	if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc)
		tsc_base = tsc_this;

	guest_write_tsc(0, tsc_base);
2256

2257 2258 2259
	return 0;
}

2260 2261 2262 2263 2264 2265 2266 2267 2268
static int init_rmode(struct kvm *kvm)
{
	if (!init_rmode_tss(kvm))
		return 0;
	if (!init_rmode_identity_map(kvm))
		return 0;
	return 1;
}

2269 2270 2271 2272 2273 2274
static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	u64 msr;
	int ret;

2275
	vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
2276
	down_read(&vcpu->kvm->slots_lock);
2277
	if (!init_rmode(vmx->vcpu.kvm)) {
2278 2279 2280 2281
		ret = -ENOMEM;
		goto out;
	}

2282
	vmx->vcpu.arch.rmode.active = 0;
2283

2284 2285
	vmx->soft_vnmi_blocked = 0;

2286
	vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
2287
	kvm_set_cr8(&vmx->vcpu, 0);
2288 2289 2290 2291 2292 2293 2294
	msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
	if (vmx->vcpu.vcpu_id == 0)
		msr |= MSR_IA32_APICBASE_BSP;
	kvm_set_apic_base(&vmx->vcpu, msr);

	fx_init(&vmx->vcpu);

2295
	seg_setup(VCPU_SREG_CS);
2296 2297 2298 2299 2300 2301 2302 2303
	/*
	 * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
	 * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4.  Sigh.
	 */
	if (vmx->vcpu.vcpu_id == 0) {
		vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
		vmcs_writel(GUEST_CS_BASE, 0x000f0000);
	} else {
2304 2305
		vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
		vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329
	}

	seg_setup(VCPU_SREG_DS);
	seg_setup(VCPU_SREG_ES);
	seg_setup(VCPU_SREG_FS);
	seg_setup(VCPU_SREG_GS);
	seg_setup(VCPU_SREG_SS);

	vmcs_write16(GUEST_TR_SELECTOR, 0);
	vmcs_writel(GUEST_TR_BASE, 0);
	vmcs_write32(GUEST_TR_LIMIT, 0xffff);
	vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);

	vmcs_write16(GUEST_LDTR_SELECTOR, 0);
	vmcs_writel(GUEST_LDTR_BASE, 0);
	vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
	vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);

	vmcs_write32(GUEST_SYSENTER_CS, 0);
	vmcs_writel(GUEST_SYSENTER_ESP, 0);
	vmcs_writel(GUEST_SYSENTER_EIP, 0);

	vmcs_writel(GUEST_RFLAGS, 0x02);
	if (vmx->vcpu.vcpu_id == 0)
2330
		kvm_rip_write(vcpu, 0xfff0);
2331
	else
2332 2333
		kvm_rip_write(vcpu, 0);
	kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351

	vmcs_writel(GUEST_DR7, 0x400);

	vmcs_writel(GUEST_GDTR_BASE, 0);
	vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);

	vmcs_writel(GUEST_IDTR_BASE, 0);
	vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);

	vmcs_write32(GUEST_ACTIVITY_STATE, 0);
	vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
	vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);

	/* Special registers */
	vmcs_write64(GUEST_IA32_DEBUGCTL, 0);

	setup_msrs(vmx);

A
Avi Kivity 已提交
2352 2353
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */

2354 2355 2356 2357
	if (cpu_has_vmx_tpr_shadow()) {
		vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
		if (vm_need_tpr_shadow(vmx->vcpu.kvm))
			vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
2358
				page_to_phys(vmx->vcpu.arch.apic->regs_page));
2359 2360 2361 2362 2363
		vmcs_write32(TPR_THRESHOLD, 0);
	}

	if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
		vmcs_write64(APIC_ACCESS_ADDR,
2364
			     page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
A
Avi Kivity 已提交
2365

2366 2367 2368
	if (vmx->vpid != 0)
		vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);

2369 2370
	vmx->vcpu.arch.cr0 = 0x60000010;
	vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */
R
Rusty Russell 已提交
2371 2372 2373 2374
	vmx_set_cr4(&vmx->vcpu, 0);
	vmx_set_efer(&vmx->vcpu, 0);
	vmx_fpu_activate(&vmx->vcpu);
	update_exception_bitmap(&vmx->vcpu);
A
Avi Kivity 已提交
2375

2376 2377
	vpid_sync_vcpu_all(vmx);

2378
	ret = 0;
A
Avi Kivity 已提交
2379

2380 2381 2382
	/* HACK: Don't enable emulation on guest boot/reset */
	vmx->emulation_required = 0;

A
Avi Kivity 已提交
2383
out:
2384
	up_read(&vcpu->kvm->slots_lock);
A
Avi Kivity 已提交
2385 2386 2387
	return ret;
}

2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410
static void enable_irq_window(struct kvm_vcpu *vcpu)
{
	u32 cpu_based_vm_exec_control;

	cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
	cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
}

static void enable_nmi_window(struct kvm_vcpu *vcpu)
{
	u32 cpu_based_vm_exec_control;

	if (!cpu_has_virtual_nmis()) {
		enable_irq_window(vcpu);
		return;
	}

	cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
	cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
}

2411 2412
static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
{
2413 2414
	struct vcpu_vmx *vmx = to_vmx(vcpu);

F
Feng (Eric) Liu 已提交
2415 2416
	KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);

2417
	++vcpu->stat.irq_injections;
2418
	if (vcpu->arch.rmode.active) {
2419 2420
		vmx->rmode.irq.pending = true;
		vmx->rmode.irq.vector = irq;
2421
		vmx->rmode.irq.rip = kvm_rip_read(vcpu);
2422 2423 2424
		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			     irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2425
		kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
2426 2427 2428 2429 2430 2431
		return;
	}
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
}

2432 2433
static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
{
J
Jan Kiszka 已提交
2434 2435
	struct vcpu_vmx *vmx = to_vmx(vcpu);

2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448
	if (!cpu_has_virtual_nmis()) {
		/*
		 * Tracking the NMI-blocked state in software is built upon
		 * finding the next open IRQ window. This, in turn, depends on
		 * well-behaving guests: They have to keep IRQs disabled at
		 * least as long as the NMI handler runs. Otherwise we may
		 * cause NMI nesting, maybe breaking the guest. But as this is
		 * highly unlikely, we can live with the residual risk.
		 */
		vmx->soft_vnmi_blocked = 1;
		vmx->vnmi_blocked_time = 0;
	}

2449
	++vcpu->stat.nmi_injections;
J
Jan Kiszka 已提交
2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460
	if (vcpu->arch.rmode.active) {
		vmx->rmode.irq.pending = true;
		vmx->rmode.irq.vector = NMI_VECTOR;
		vmx->rmode.irq.rip = kvm_rip_read(vcpu);
		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			     NMI_VECTOR | INTR_TYPE_SOFT_INTR |
			     INTR_INFO_VALID_MASK);
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
		kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
		return;
	}
2461 2462 2463 2464
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
}

2465 2466 2467 2468 2469 2470 2471 2472
static void vmx_update_window_states(struct kvm_vcpu *vcpu)
{
	u32 guest_intr = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);

	vcpu->arch.nmi_window_open =
		!(guest_intr & (GUEST_INTR_STATE_STI |
				GUEST_INTR_STATE_MOV_SS |
				GUEST_INTR_STATE_NMI));
2473 2474
	if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
		vcpu->arch.nmi_window_open = 0;
2475 2476 2477 2478 2479 2480 2481

	vcpu->arch.interrupt_window_open =
		((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
		 !(guest_intr & (GUEST_INTR_STATE_STI |
				 GUEST_INTR_STATE_MOV_SS)));
}

A
Avi Kivity 已提交
2482 2483
static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
{
2484 2485
	int word_index = __ffs(vcpu->arch.irq_summary);
	int bit_index = __ffs(vcpu->arch.irq_pending[word_index]);
A
Avi Kivity 已提交
2486 2487
	int irq = word_index * BITS_PER_LONG + bit_index;

2488 2489 2490
	clear_bit(bit_index, &vcpu->arch.irq_pending[word_index]);
	if (!vcpu->arch.irq_pending[word_index])
		clear_bit(word_index, &vcpu->arch.irq_summary);
2491
	kvm_queue_interrupt(vcpu, irq);
A
Avi Kivity 已提交
2492 2493
}

2494 2495 2496 2497 2498
static void do_interrupt_requests(struct kvm_vcpu *vcpu,
				       struct kvm_run *kvm_run)
{
	vmx_update_window_states(vcpu);

2499 2500 2501 2502 2503
	if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
		vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
				GUEST_INTR_STATE_STI |
				GUEST_INTR_STATE_MOV_SS);

2504
	if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
2505 2506 2507
		if (vcpu->arch.interrupt.pending) {
			enable_nmi_window(vcpu);
		} else if (vcpu->arch.nmi_window_open) {
2508 2509 2510 2511
			vcpu->arch.nmi_pending = false;
			vcpu->arch.nmi_injected = true;
		} else {
			enable_nmi_window(vcpu);
2512 2513
			return;
		}
2514 2515 2516
	}
	if (vcpu->arch.nmi_injected) {
		vmx_inject_nmi(vcpu);
2517
		if (vcpu->arch.nmi_pending)
2518
			enable_nmi_window(vcpu);
2519 2520 2521 2522
		else if (vcpu->arch.irq_summary
			 || kvm_run->request_interrupt_window)
			enable_irq_window(vcpu);
		return;
2523 2524
	}

2525 2526 2527 2528 2529 2530 2531
	if (vcpu->arch.interrupt_window_open) {
		if (vcpu->arch.irq_summary && !vcpu->arch.interrupt.pending)
			kvm_do_inject_irq(vcpu);

		if (vcpu->arch.interrupt.pending)
			vmx_inject_irq(vcpu, vcpu->arch.interrupt.nr);
	}
2532 2533
	if (!vcpu->arch.interrupt_window_open &&
	    (vcpu->arch.irq_summary || kvm_run->request_interrupt_window))
2534
		enable_irq_window(vcpu);
A
Avi Kivity 已提交
2535 2536
}

2537 2538 2539 2540
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
{
	int ret;
	struct kvm_userspace_memory_region tss_mem = {
2541
		.slot = TSS_PRIVATE_MEMSLOT,
2542 2543 2544 2545 2546 2547 2548 2549
		.guest_phys_addr = addr,
		.memory_size = PAGE_SIZE * 3,
		.flags = 0,
	};

	ret = kvm_set_memory_region(kvm, &tss_mem, 0);
	if (ret)
		return ret;
2550
	kvm->arch.tss_addr = addr;
2551 2552 2553
	return 0;
}

A
Avi Kivity 已提交
2554 2555 2556
static int handle_rmode_exception(struct kvm_vcpu *vcpu,
				  int vec, u32 err_code)
{
2557 2558 2559 2560 2561
	/*
	 * Instruction with address size override prefix opcode 0x67
	 * Cause the #SS fault with 0 error code in VM86 mode.
	 */
	if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
2562
		if (emulate_instruction(vcpu, NULL, 0, 0, 0) == EMULATE_DONE)
A
Avi Kivity 已提交
2563
			return 1;
2564 2565 2566 2567 2568 2569 2570
	/*
	 * Forward all other exceptions that are valid in real mode.
	 * FIXME: Breaks guest debugging in real mode, needs to be fixed with
	 *        the required debugging infrastructure rework.
	 */
	switch (vec) {
	case DB_VECTOR:
J
Jan Kiszka 已提交
2571 2572 2573 2574 2575
		if (vcpu->guest_debug &
		    (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
			return 0;
		kvm_queue_exception(vcpu, vec);
		return 1;
2576
	case BP_VECTOR:
J
Jan Kiszka 已提交
2577 2578 2579 2580
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
			return 0;
		/* fall through */
	case DE_VECTOR:
2581 2582 2583 2584 2585 2586 2587 2588 2589 2590
	case OF_VECTOR:
	case BR_VECTOR:
	case UD_VECTOR:
	case DF_VECTOR:
	case SS_VECTOR:
	case GP_VECTOR:
	case MF_VECTOR:
		kvm_queue_exception(vcpu, vec);
		return 1;
	}
A
Avi Kivity 已提交
2591 2592 2593 2594 2595
	return 0;
}

static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2596
	struct vcpu_vmx *vmx = to_vmx(vcpu);
J
Jan Kiszka 已提交
2597
	u32 intr_info, ex_no, error_code;
2598
	unsigned long cr2, rip, dr6;
A
Avi Kivity 已提交
2599 2600 2601
	u32 vect_info;
	enum emulation_result er;

2602
	vect_info = vmx->idt_vectoring_info;
A
Avi Kivity 已提交
2603 2604 2605
	intr_info = vmcs_read32(VM_EXIT_INTR_INFO);

	if ((vect_info & VECTORING_INFO_VALID_MASK) &&
M
Mike Day 已提交
2606
						!is_page_fault(intr_info))
A
Avi Kivity 已提交
2607
		printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
2608
		       "intr info 0x%x\n", __func__, vect_info, intr_info);
A
Avi Kivity 已提交
2609

2610
	if (!irqchip_in_kernel(vcpu->kvm) && is_external_interrupt(vect_info)) {
A
Avi Kivity 已提交
2611
		int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
2612 2613
		set_bit(irq, vcpu->arch.irq_pending);
		set_bit(irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
A
Avi Kivity 已提交
2614 2615
	}

2616
	if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
2617
		return 1;  /* already handled by vmx_vcpu_run() */
2618 2619

	if (is_no_device(intr_info)) {
2620
		vmx_fpu_activate(vcpu);
2621 2622 2623
		return 1;
	}

2624
	if (is_invalid_opcode(intr_info)) {
2625
		er = emulate_instruction(vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
2626
		if (er != EMULATE_DONE)
2627
			kvm_queue_exception(vcpu, UD_VECTOR);
2628 2629 2630
		return 1;
	}

A
Avi Kivity 已提交
2631
	error_code = 0;
2632
	rip = kvm_rip_read(vcpu);
2633
	if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
A
Avi Kivity 已提交
2634 2635
		error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
	if (is_page_fault(intr_info)) {
2636 2637 2638
		/* EPT won't cause page fault directly */
		if (vm_need_ept())
			BUG();
A
Avi Kivity 已提交
2639
		cr2 = vmcs_readl(EXIT_QUALIFICATION);
F
Feng (Eric) Liu 已提交
2640 2641
		KVMTRACE_3D(PAGE_FAULT, vcpu, error_code, (u32)cr2,
			    (u32)((u64)cr2 >> 32), handler);
2642
		if (vcpu->arch.interrupt.pending || vcpu->arch.exception.pending)
2643
			kvm_mmu_unprotect_page_virt(vcpu, cr2);
2644
		return kvm_mmu_page_fault(vcpu, cr2, error_code);
A
Avi Kivity 已提交
2645 2646
	}

2647
	if (vcpu->arch.rmode.active &&
A
Avi Kivity 已提交
2648
	    handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
2649
								error_code)) {
2650 2651
		if (vcpu->arch.halt_request) {
			vcpu->arch.halt_request = 0;
2652 2653
			return kvm_emulate_halt(vcpu);
		}
A
Avi Kivity 已提交
2654
		return 1;
2655
	}
A
Avi Kivity 已提交
2656

J
Jan Kiszka 已提交
2657
	ex_no = intr_info & INTR_INFO_VECTOR_MASK;
2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670
	switch (ex_no) {
	case DB_VECTOR:
		dr6 = vmcs_readl(EXIT_QUALIFICATION);
		if (!(vcpu->guest_debug &
		      (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
			vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
			kvm_queue_exception(vcpu, DB_VECTOR);
			return 1;
		}
		kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
		kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
		/* fall through */
	case BP_VECTOR:
A
Avi Kivity 已提交
2671
		kvm_run->exit_reason = KVM_EXIT_DEBUG;
J
Jan Kiszka 已提交
2672 2673
		kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
		kvm_run->debug.arch.exception = ex_no;
2674 2675
		break;
	default:
J
Jan Kiszka 已提交
2676 2677 2678
		kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
		kvm_run->ex.exception = ex_no;
		kvm_run->ex.error_code = error_code;
2679
		break;
A
Avi Kivity 已提交
2680 2681 2682 2683 2684 2685 2686
	}
	return 0;
}

static int handle_external_interrupt(struct kvm_vcpu *vcpu,
				     struct kvm_run *kvm_run)
{
A
Avi Kivity 已提交
2687
	++vcpu->stat.irq_exits;
F
Feng (Eric) Liu 已提交
2688
	KVMTRACE_1D(INTR, vcpu, vmcs_read32(VM_EXIT_INTR_INFO), handler);
A
Avi Kivity 已提交
2689 2690 2691
	return 1;
}

2692 2693 2694 2695 2696
static int handle_triple_fault(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
	return 0;
}
A
Avi Kivity 已提交
2697 2698 2699

static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2700
	unsigned long exit_qualification;
2701 2702
	int size, down, in, string, rep;
	unsigned port;
A
Avi Kivity 已提交
2703

A
Avi Kivity 已提交
2704
	++vcpu->stat.io_exits;
2705
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2706
	string = (exit_qualification & 16) != 0;
2707 2708

	if (string) {
2709 2710
		if (emulate_instruction(vcpu,
					kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
2711 2712 2713 2714 2715 2716
			return 0;
		return 1;
	}

	size = (exit_qualification & 7) + 1;
	in = (exit_qualification & 8) != 0;
2717 2718 2719
	down = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
	rep = (exit_qualification & 32) != 0;
	port = exit_qualification >> 16;
2720

2721
	skip_emulated_instruction(vcpu);
L
Laurent Vivier 已提交
2722
	return kvm_emulate_pio(vcpu, kvm_run, in, size, port);
A
Avi Kivity 已提交
2723 2724
}

I
Ingo Molnar 已提交
2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735
static void
vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
{
	/*
	 * Patch in the VMCALL instruction:
	 */
	hypercall[0] = 0x0f;
	hypercall[1] = 0x01;
	hypercall[2] = 0xc1;
}

A
Avi Kivity 已提交
2736 2737
static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2738
	unsigned long exit_qualification;
A
Avi Kivity 已提交
2739 2740 2741
	int cr;
	int reg;

2742
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
A
Avi Kivity 已提交
2743 2744 2745 2746
	cr = exit_qualification & 15;
	reg = (exit_qualification >> 8) & 15;
	switch ((exit_qualification >> 4) & 3) {
	case 0: /* mov to cr */
2747 2748 2749 2750
		KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr,
			    (u32)kvm_register_read(vcpu, reg),
			    (u32)((u64)kvm_register_read(vcpu, reg) >> 32),
			    handler);
A
Avi Kivity 已提交
2751 2752
		switch (cr) {
		case 0:
2753
			kvm_set_cr0(vcpu, kvm_register_read(vcpu, reg));
A
Avi Kivity 已提交
2754 2755 2756
			skip_emulated_instruction(vcpu);
			return 1;
		case 3:
2757
			kvm_set_cr3(vcpu, kvm_register_read(vcpu, reg));
A
Avi Kivity 已提交
2758 2759 2760
			skip_emulated_instruction(vcpu);
			return 1;
		case 4:
2761
			kvm_set_cr4(vcpu, kvm_register_read(vcpu, reg));
A
Avi Kivity 已提交
2762 2763 2764
			skip_emulated_instruction(vcpu);
			return 1;
		case 8:
2765
			kvm_set_cr8(vcpu, kvm_register_read(vcpu, reg));
A
Avi Kivity 已提交
2766
			skip_emulated_instruction(vcpu);
2767 2768
			if (irqchip_in_kernel(vcpu->kvm))
				return 1;
2769 2770
			kvm_run->exit_reason = KVM_EXIT_SET_TPR;
			return 0;
A
Avi Kivity 已提交
2771 2772
		};
		break;
2773
	case 2: /* clts */
2774
		vmx_fpu_deactivate(vcpu);
2775 2776
		vcpu->arch.cr0 &= ~X86_CR0_TS;
		vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
2777
		vmx_fpu_activate(vcpu);
F
Feng (Eric) Liu 已提交
2778
		KVMTRACE_0D(CLTS, vcpu, handler);
2779 2780
		skip_emulated_instruction(vcpu);
		return 1;
A
Avi Kivity 已提交
2781 2782 2783
	case 1: /*mov from cr*/
		switch (cr) {
		case 3:
2784
			kvm_register_write(vcpu, reg, vcpu->arch.cr3);
F
Feng (Eric) Liu 已提交
2785
			KVMTRACE_3D(CR_READ, vcpu, (u32)cr,
2786 2787
				    (u32)kvm_register_read(vcpu, reg),
				    (u32)((u64)kvm_register_read(vcpu, reg) >> 32),
F
Feng (Eric) Liu 已提交
2788
				    handler);
A
Avi Kivity 已提交
2789 2790 2791
			skip_emulated_instruction(vcpu);
			return 1;
		case 8:
2792
			kvm_register_write(vcpu, reg, kvm_get_cr8(vcpu));
F
Feng (Eric) Liu 已提交
2793
			KVMTRACE_2D(CR_READ, vcpu, (u32)cr,
2794
				    (u32)kvm_register_read(vcpu, reg), handler);
A
Avi Kivity 已提交
2795 2796 2797 2798 2799
			skip_emulated_instruction(vcpu);
			return 1;
		}
		break;
	case 3: /* lmsw */
2800
		kvm_lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
A
Avi Kivity 已提交
2801 2802 2803 2804 2805 2806 2807

		skip_emulated_instruction(vcpu);
		return 1;
	default:
		break;
	}
	kvm_run->exit_reason = 0;
2808
	pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
A
Avi Kivity 已提交
2809 2810 2811 2812 2813 2814
	       (int)(exit_qualification >> 4) & 3, cr);
	return 0;
}

static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2815
	unsigned long exit_qualification;
A
Avi Kivity 已提交
2816 2817 2818
	unsigned long val;
	int dr, reg;

2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843
	dr = vmcs_readl(GUEST_DR7);
	if (dr & DR7_GD) {
		/*
		 * As the vm-exit takes precedence over the debug trap, we
		 * need to emulate the latter, either for the host or the
		 * guest debugging itself.
		 */
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
			kvm_run->debug.arch.dr6 = vcpu->arch.dr6;
			kvm_run->debug.arch.dr7 = dr;
			kvm_run->debug.arch.pc =
				vmcs_readl(GUEST_CS_BASE) +
				vmcs_readl(GUEST_RIP);
			kvm_run->debug.arch.exception = DB_VECTOR;
			kvm_run->exit_reason = KVM_EXIT_DEBUG;
			return 0;
		} else {
			vcpu->arch.dr7 &= ~DR7_GD;
			vcpu->arch.dr6 |= DR6_BD;
			vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
			kvm_queue_exception(vcpu, DB_VECTOR);
			return 1;
		}
	}

2844
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2845 2846 2847
	dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
	reg = DEBUG_REG_ACCESS_REG(exit_qualification);
	if (exit_qualification & TYPE_MOV_FROM_DR) {
A
Avi Kivity 已提交
2848
		switch (dr) {
2849 2850 2851
		case 0 ... 3:
			val = vcpu->arch.db[dr];
			break;
A
Avi Kivity 已提交
2852
		case 6:
2853
			val = vcpu->arch.dr6;
A
Avi Kivity 已提交
2854 2855
			break;
		case 7:
2856
			val = vcpu->arch.dr7;
A
Avi Kivity 已提交
2857 2858 2859 2860
			break;
		default:
			val = 0;
		}
2861
		kvm_register_write(vcpu, reg, val);
F
Feng (Eric) Liu 已提交
2862
		KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
A
Avi Kivity 已提交
2863
	} else {
2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895
		val = vcpu->arch.regs[reg];
		switch (dr) {
		case 0 ... 3:
			vcpu->arch.db[dr] = val;
			if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
				vcpu->arch.eff_db[dr] = val;
			break;
		case 4 ... 5:
			if (vcpu->arch.cr4 & X86_CR4_DE)
				kvm_queue_exception(vcpu, UD_VECTOR);
			break;
		case 6:
			if (val & 0xffffffff00000000ULL) {
				kvm_queue_exception(vcpu, GP_VECTOR);
				break;
			}
			vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
			break;
		case 7:
			if (val & 0xffffffff00000000ULL) {
				kvm_queue_exception(vcpu, GP_VECTOR);
				break;
			}
			vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
			if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
				vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
				vcpu->arch.switch_db_regs =
					(val & DR7_BP_EN_MASK);
			}
			break;
		}
		KVMTRACE_2D(DR_WRITE, vcpu, (u32)dr, (u32)val, handler);
A
Avi Kivity 已提交
2896 2897 2898 2899 2900 2901 2902
	}
	skip_emulated_instruction(vcpu);
	return 1;
}

static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2903 2904
	kvm_emulate_cpuid(vcpu);
	return 1;
A
Avi Kivity 已提交
2905 2906 2907 2908
}

static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2909
	u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
A
Avi Kivity 已提交
2910 2911 2912
	u64 data;

	if (vmx_get_msr(vcpu, ecx, &data)) {
2913
		kvm_inject_gp(vcpu, 0);
A
Avi Kivity 已提交
2914 2915 2916
		return 1;
	}

F
Feng (Eric) Liu 已提交
2917 2918 2919
	KVMTRACE_3D(MSR_READ, vcpu, ecx, (u32)data, (u32)(data >> 32),
		    handler);

A
Avi Kivity 已提交
2920
	/* FIXME: handling of bits 32:63 of rax, rdx */
2921 2922
	vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
	vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
A
Avi Kivity 已提交
2923 2924 2925 2926 2927 2928
	skip_emulated_instruction(vcpu);
	return 1;
}

static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2929 2930 2931
	u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
	u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
		| ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
A
Avi Kivity 已提交
2932

F
Feng (Eric) Liu 已提交
2933 2934 2935
	KVMTRACE_3D(MSR_WRITE, vcpu, ecx, (u32)data, (u32)(data >> 32),
		    handler);

A
Avi Kivity 已提交
2936
	if (vmx_set_msr(vcpu, ecx, data) != 0) {
2937
		kvm_inject_gp(vcpu, 0);
A
Avi Kivity 已提交
2938 2939 2940 2941 2942 2943 2944
		return 1;
	}

	skip_emulated_instruction(vcpu);
	return 1;
}

2945 2946 2947 2948 2949 2950
static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu,
				      struct kvm_run *kvm_run)
{
	return 1;
}

A
Avi Kivity 已提交
2951 2952 2953
static int handle_interrupt_window(struct kvm_vcpu *vcpu,
				   struct kvm_run *kvm_run)
{
2954 2955 2956 2957 2958 2959
	u32 cpu_based_vm_exec_control;

	/* clear pending irq */
	cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
	cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
F
Feng (Eric) Liu 已提交
2960 2961

	KVMTRACE_0D(PEND_INTR, vcpu, handler);
2962
	++vcpu->stat.irq_window_exits;
F
Feng (Eric) Liu 已提交
2963

2964 2965 2966 2967 2968
	/*
	 * If the user space waits to inject interrupts, exit as soon as
	 * possible
	 */
	if (kvm_run->request_interrupt_window &&
2969
	    !vcpu->arch.irq_summary) {
2970 2971 2972
		kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
		return 0;
	}
A
Avi Kivity 已提交
2973 2974 2975 2976 2977 2978
	return 1;
}

static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	skip_emulated_instruction(vcpu);
2979
	return kvm_emulate_halt(vcpu);
A
Avi Kivity 已提交
2980 2981
}

2982 2983
static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2984
	skip_emulated_instruction(vcpu);
2985 2986
	kvm_emulate_hypercall(vcpu);
	return 1;
2987 2988
}

M
Marcelo Tosatti 已提交
2989 2990 2991 2992 2993 2994 2995 2996 2997
static int handle_invlpg(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u64 exit_qualification = vmcs_read64(EXIT_QUALIFICATION);

	kvm_mmu_invlpg(vcpu, exit_qualification);
	skip_emulated_instruction(vcpu);
	return 1;
}

E
Eddie Dong 已提交
2998 2999 3000 3001 3002 3003 3004
static int handle_wbinvd(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	skip_emulated_instruction(vcpu);
	/* TODO: Add support for VT-d/pass-through device */
	return 1;
}

3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024
static int handle_apic_access(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u64 exit_qualification;
	enum emulation_result er;
	unsigned long offset;

	exit_qualification = vmcs_read64(EXIT_QUALIFICATION);
	offset = exit_qualification & 0xffful;

	er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);

	if (er !=  EMULATE_DONE) {
		printk(KERN_ERR
		       "Fail to handle apic access vmexit! Offset is 0x%lx\n",
		       offset);
		return -ENOTSUPP;
	}
	return 1;
}

3025 3026
static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
J
Jan Kiszka 已提交
3027
	struct vcpu_vmx *vmx = to_vmx(vcpu);
3028 3029 3030 3031 3032 3033 3034
	unsigned long exit_qualification;
	u16 tss_selector;
	int reason;

	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);

	reason = (u32)exit_qualification >> 30;
J
Jan Kiszka 已提交
3035 3036 3037 3038 3039 3040 3041 3042 3043
	if (reason == TASK_SWITCH_GATE && vmx->vcpu.arch.nmi_injected &&
	    (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
	    (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK)
	    == INTR_TYPE_NMI_INTR) {
		vcpu->arch.nmi_injected = false;
		if (cpu_has_virtual_nmis())
			vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
				      GUEST_INTR_STATE_NMI);
	}
3044 3045
	tss_selector = exit_qualification;

3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057
	if (!kvm_task_switch(vcpu, tss_selector, reason))
		return 0;

	/* clear all local breakpoint enable flags */
	vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);

	/*
	 * TODO: What about debug traps on tss switch?
	 *       Are we supposed to inject them and update dr6?
	 */

	return 1;
3058 3059
}

3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117
static int handle_ept_violation(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u64 exit_qualification;
	enum emulation_result er;
	gpa_t gpa;
	unsigned long hva;
	int gla_validity;
	int r;

	exit_qualification = vmcs_read64(EXIT_QUALIFICATION);

	if (exit_qualification & (1 << 6)) {
		printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
		return -ENOTSUPP;
	}

	gla_validity = (exit_qualification >> 7) & 0x3;
	if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
		printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
		printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
			(long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
			(long unsigned int)vmcs_read64(GUEST_LINEAR_ADDRESS));
		printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
			(long unsigned int)exit_qualification);
		kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
		kvm_run->hw.hardware_exit_reason = 0;
		return -ENOTSUPP;
	}

	gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
	hva = gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT);
	if (!kvm_is_error_hva(hva)) {
		r = kvm_mmu_page_fault(vcpu, gpa & PAGE_MASK, 0);
		if (r < 0) {
			printk(KERN_ERR "EPT: Not enough memory!\n");
			return -ENOMEM;
		}
		return 1;
	} else {
		/* must be MMIO */
		er = emulate_instruction(vcpu, kvm_run, 0, 0, 0);

		if (er == EMULATE_FAIL) {
			printk(KERN_ERR
			 "EPT: Fail to handle EPT violation vmexit!er is %d\n",
			 er);
			printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
			 (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
			 (long unsigned int)vmcs_read64(GUEST_LINEAR_ADDRESS));
			printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
				(long unsigned int)exit_qualification);
			return -ENOTSUPP;
		} else if (er == EMULATE_DO_MMIO)
			return 0;
	}
	return 1;
}

3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130
static int handle_nmi_window(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	u32 cpu_based_vm_exec_control;

	/* clear pending NMI */
	cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
	cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
	++vcpu->stat.nmi_window_exits;

	return 1;
}

3131 3132 3133
static void handle_invalid_guest_state(struct kvm_vcpu *vcpu,
				struct kvm_run *kvm_run)
{
3134 3135
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	enum emulation_result err = EMULATE_DONE;
3136 3137 3138 3139 3140 3141 3142

	preempt_enable();
	local_irq_enable();

	while (!guest_state_valid(vcpu)) {
		err = emulate_instruction(vcpu, kvm_run, 0, 0, 0);

3143 3144 3145 3146 3147 3148
		if (err == EMULATE_DO_MMIO)
			break;

		if (err != EMULATE_DONE) {
			kvm_report_emulation_failure(vcpu, "emulation failure");
			return;
3149 3150 3151 3152 3153 3154 3155 3156 3157 3158
		}

		if (signal_pending(current))
			break;
		if (need_resched())
			schedule();
	}

	local_irq_disable();
	preempt_disable();
3159 3160

	vmx->invalid_state_emulation_result = err;
3161 3162
}

A
Avi Kivity 已提交
3163 3164 3165 3166 3167 3168 3169 3170 3171
/*
 * The exit handlers return 1 if the exit was handled fully and guest execution
 * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
 * to be done to userspace and return 0.
 */
static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu,
				      struct kvm_run *kvm_run) = {
	[EXIT_REASON_EXCEPTION_NMI]           = handle_exception,
	[EXIT_REASON_EXTERNAL_INTERRUPT]      = handle_external_interrupt,
3172
	[EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
3173
	[EXIT_REASON_NMI_WINDOW]	      = handle_nmi_window,
A
Avi Kivity 已提交
3174 3175 3176 3177 3178 3179 3180 3181
	[EXIT_REASON_IO_INSTRUCTION]          = handle_io,
	[EXIT_REASON_CR_ACCESS]               = handle_cr,
	[EXIT_REASON_DR_ACCESS]               = handle_dr,
	[EXIT_REASON_CPUID]                   = handle_cpuid,
	[EXIT_REASON_MSR_READ]                = handle_rdmsr,
	[EXIT_REASON_MSR_WRITE]               = handle_wrmsr,
	[EXIT_REASON_PENDING_INTERRUPT]       = handle_interrupt_window,
	[EXIT_REASON_HLT]                     = handle_halt,
M
Marcelo Tosatti 已提交
3182
	[EXIT_REASON_INVLPG]		      = handle_invlpg,
3183
	[EXIT_REASON_VMCALL]                  = handle_vmcall,
3184 3185
	[EXIT_REASON_TPR_BELOW_THRESHOLD]     = handle_tpr_below_threshold,
	[EXIT_REASON_APIC_ACCESS]             = handle_apic_access,
E
Eddie Dong 已提交
3186
	[EXIT_REASON_WBINVD]                  = handle_wbinvd,
3187
	[EXIT_REASON_TASK_SWITCH]             = handle_task_switch,
3188
	[EXIT_REASON_EPT_VIOLATION]	      = handle_ept_violation,
A
Avi Kivity 已提交
3189 3190 3191
};

static const int kvm_vmx_max_exit_handlers =
3192
	ARRAY_SIZE(kvm_vmx_exit_handlers);
A
Avi Kivity 已提交
3193 3194 3195 3196 3197 3198 3199 3200

/*
 * The guest has exited.  See if we can fix it or if we need userspace
 * assistance.
 */
static int kvm_handle_exit(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
	u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
3201
	struct vcpu_vmx *vmx = to_vmx(vcpu);
3202
	u32 vectoring_info = vmx->idt_vectoring_info;
3203

3204 3205
	KVMTRACE_3D(VMEXIT, vcpu, exit_reason, (u32)kvm_rip_read(vcpu),
		    (u32)((u64)kvm_rip_read(vcpu) >> 32), entryexit);
F
Feng (Eric) Liu 已提交
3206

3207 3208
	/* If we need to emulate an MMIO from handle_invalid_guest_state
	 * we just return 0 */
3209 3210 3211
	if (vmx->emulation_required && emulate_invalid_guest_state) {
		if (guest_state_valid(vcpu))
			vmx->emulation_required = 0;
3212
		return vmx->invalid_state_emulation_result != EMULATE_DO_MMIO;
3213
	}
3214

3215 3216 3217 3218 3219 3220 3221
	/* Access CR3 don't cause VMExit in paging mode, so we need
	 * to sync with guest real CR3. */
	if (vm_need_ept() && is_paging(vcpu)) {
		vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
		ept_load_pdptrs(vcpu);
	}

3222 3223 3224 3225 3226 3227
	if (unlikely(vmx->fail)) {
		kvm_run->exit_reason = KVM_EXIT_FAIL_ENTRY;
		kvm_run->fail_entry.hardware_entry_failure_reason
			= vmcs_read32(VM_INSTRUCTION_ERROR);
		return 0;
	}
A
Avi Kivity 已提交
3228

M
Mike Day 已提交
3229
	if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
3230
			(exit_reason != EXIT_REASON_EXCEPTION_NMI &&
J
Jan Kiszka 已提交
3231 3232 3233 3234 3235
			exit_reason != EXIT_REASON_EPT_VIOLATION &&
			exit_reason != EXIT_REASON_TASK_SWITCH))
		printk(KERN_WARNING "%s: unexpected, valid vectoring info "
		       "(0x%x) and exit reason is 0x%x\n",
		       __func__, vectoring_info, exit_reason);
3236 3237 3238 3239 3240 3241

	if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
		if (vcpu->arch.interrupt_window_open) {
			vmx->soft_vnmi_blocked = 0;
			vcpu->arch.nmi_window_open = 1;
		} else if (vmx->vnmi_blocked_time > 1000000000LL &&
3242
			   vcpu->arch.nmi_pending) {
3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256
			/*
			 * This CPU don't support us in finding the end of an
			 * NMI-blocked window if the guest runs with IRQs
			 * disabled. So we pull the trigger after 1 s of
			 * futile waiting, but inform the user about this.
			 */
			printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
			       "state on VCPU %d after 1 s timeout\n",
			       __func__, vcpu->vcpu_id);
			vmx->soft_vnmi_blocked = 0;
			vmx->vcpu.arch.nmi_window_open = 1;
		}
	}

A
Avi Kivity 已提交
3257 3258 3259 3260 3261 3262 3263 3264 3265 3266
	if (exit_reason < kvm_vmx_max_exit_handlers
	    && kvm_vmx_exit_handlers[exit_reason])
		return kvm_vmx_exit_handlers[exit_reason](vcpu, kvm_run);
	else {
		kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
		kvm_run->hw.hardware_exit_reason = exit_reason;
	}
	return 0;
}

3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283
static void update_tpr_threshold(struct kvm_vcpu *vcpu)
{
	int max_irr, tpr;

	if (!vm_need_tpr_shadow(vcpu->kvm))
		return;

	if (!kvm_lapic_enabled(vcpu) ||
	    ((max_irr = kvm_lapic_find_highest_irr(vcpu)) == -1)) {
		vmcs_write32(TPR_THRESHOLD, 0);
		return;
	}

	tpr = (kvm_lapic_get_cr8(vcpu) & 0x0f) << 4;
	vmcs_write32(TPR_THRESHOLD, (max_irr > tpr) ? tpr >> 4 : max_irr >> 4);
}

3284 3285 3286
static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
{
	u32 exit_intr_info;
3287
	u32 idt_vectoring_info;
3288 3289
	bool unblock_nmi;
	u8 vector;
3290 3291
	int type;
	bool idtv_info_valid;
3292
	u32 error;
3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305

	exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
	if (cpu_has_virtual_nmis()) {
		unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
		vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
		/*
		 * SDM 3: 25.7.1.2
		 * Re-set bit "block by NMI" before VM entry if vmexit caused by
		 * a guest IRET fault.
		 */
		if (unblock_nmi && vector != DF_VECTOR)
			vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
				      GUEST_INTR_STATE_NMI);
3306 3307 3308
	} else if (unlikely(vmx->soft_vnmi_blocked))
		vmx->vnmi_blocked_time +=
			ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325

	idt_vectoring_info = vmx->idt_vectoring_info;
	idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
	vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
	type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
	if (vmx->vcpu.arch.nmi_injected) {
		/*
		 * SDM 3: 25.7.1.2
		 * Clear bit "block by NMI" before VM entry if a NMI delivery
		 * faulted.
		 */
		if (idtv_info_valid && type == INTR_TYPE_NMI_INTR)
			vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
					GUEST_INTR_STATE_NMI);
		else
			vmx->vcpu.arch.nmi_injected = false;
	}
3326
	kvm_clear_exception_queue(&vmx->vcpu);
3327 3328
	if (idtv_info_valid && (type == INTR_TYPE_HARD_EXCEPTION ||
				type == INTR_TYPE_SOFT_EXCEPTION)) {
3329 3330 3331 3332 3333 3334 3335
		if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
			error = vmcs_read32(IDT_VECTORING_ERROR_CODE);
			kvm_queue_exception_e(&vmx->vcpu, vector, error);
		} else
			kvm_queue_exception(&vmx->vcpu, vector);
		vmx->idt_vectoring_info = 0;
	}
3336 3337 3338 3339 3340
	kvm_clear_interrupt_queue(&vmx->vcpu);
	if (idtv_info_valid && type == INTR_TYPE_EXT_INTR) {
		kvm_queue_interrupt(&vmx->vcpu, vector);
		vmx->idt_vectoring_info = 0;
	}
3341 3342
}

3343 3344
static void vmx_intr_assist(struct kvm_vcpu *vcpu)
{
3345 3346
	update_tpr_threshold(vcpu);

3347 3348
	vmx_update_window_states(vcpu);

3349 3350 3351 3352 3353
	if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
		vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
				GUEST_INTR_STATE_STI |
				GUEST_INTR_STATE_MOV_SS);

3354 3355 3356 3357 3358 3359 3360 3361
	if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
		if (vcpu->arch.interrupt.pending) {
			enable_nmi_window(vcpu);
		} else if (vcpu->arch.nmi_window_open) {
			vcpu->arch.nmi_pending = false;
			vcpu->arch.nmi_injected = true;
		} else {
			enable_nmi_window(vcpu);
3362 3363 3364
			return;
		}
	}
3365 3366 3367 3368 3369 3370 3371 3372
	if (vcpu->arch.nmi_injected) {
		vmx_inject_nmi(vcpu);
		if (vcpu->arch.nmi_pending)
			enable_nmi_window(vcpu);
		else if (kvm_cpu_has_interrupt(vcpu))
			enable_irq_window(vcpu);
		return;
	}
3373
	if (!vcpu->arch.interrupt.pending && kvm_cpu_has_interrupt(vcpu)) {
3374
		if (vcpu->arch.interrupt_window_open)
3375 3376 3377 3378 3379 3380
			kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu));
		else
			enable_irq_window(vcpu);
	}
	if (vcpu->arch.interrupt.pending) {
		vmx_inject_irq(vcpu, vcpu->arch.interrupt.nr);
3381 3382
		if (kvm_cpu_has_interrupt(vcpu))
			enable_irq_window(vcpu);
3383
	}
3384 3385
}

3386 3387 3388 3389 3390 3391 3392 3393 3394
/*
 * Failure to inject an interrupt should give us the information
 * in IDT_VECTORING_INFO_FIELD.  However, if the failure occurs
 * when fetching the interrupt redirection bitmap in the real-mode
 * tss, this doesn't happen.  So we do it ourselves.
 */
static void fixup_rmode_irq(struct vcpu_vmx *vmx)
{
	vmx->rmode.irq.pending = 0;
3395
	if (kvm_rip_read(&vmx->vcpu) + 1 != vmx->rmode.irq.rip)
3396
		return;
3397
	kvm_rip_write(&vmx->vcpu, vmx->rmode.irq.rip);
3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408
	if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
		vmx->idt_vectoring_info &= ~VECTORING_INFO_TYPE_MASK;
		vmx->idt_vectoring_info |= INTR_TYPE_EXT_INTR;
		return;
	}
	vmx->idt_vectoring_info =
		VECTORING_INFO_VALID_MASK
		| INTR_TYPE_EXT_INTR
		| vmx->rmode.irq.vector;
}

3409 3410 3411 3412 3413 3414 3415 3416
#ifdef CONFIG_X86_64
#define R "r"
#define Q "q"
#else
#define R "e"
#define Q "l"
#endif

3417
static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
A
Avi Kivity 已提交
3418
{
3419
	struct vcpu_vmx *vmx = to_vmx(vcpu);
3420
	u32 intr_info;
3421

3422 3423 3424 3425
	/* Record the guest's net vcpu time for enforced NMI injections. */
	if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
		vmx->entry_time = ktime_get();

3426 3427 3428 3429 3430 3431
	/* Handle invalid guest state instead of entering VMX */
	if (vmx->emulation_required && emulate_invalid_guest_state) {
		handle_invalid_guest_state(vcpu, kvm_run);
		return;
	}

3432 3433 3434 3435 3436
	if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
		vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
	if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
		vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);

3437 3438 3439 3440 3441
	/*
	 * Loading guest fpu may have cleared host cr0.ts
	 */
	vmcs_writel(HOST_CR0, read_cr0());

3442 3443
	set_debugreg(vcpu->arch.dr6, 6);

M
Mike Day 已提交
3444
	asm(
A
Avi Kivity 已提交
3445
		/* Store host registers */
3446 3447
		"push %%"R"dx; push %%"R"bp;"
		"push %%"R"cx \n\t"
3448 3449 3450
		"cmp %%"R"sp, %c[host_rsp](%0) \n\t"
		"je 1f \n\t"
		"mov %%"R"sp, %c[host_rsp](%0) \n\t"
3451
		__ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
3452
		"1: \n\t"
A
Avi Kivity 已提交
3453
		/* Check if vmlaunch of vmresume is needed */
3454
		"cmpl $0, %c[launched](%0) \n\t"
A
Avi Kivity 已提交
3455
		/* Load guest registers.  Don't clobber flags. */
3456 3457 3458 3459 3460 3461 3462 3463
		"mov %c[cr2](%0), %%"R"ax \n\t"
		"mov %%"R"ax, %%cr2 \n\t"
		"mov %c[rax](%0), %%"R"ax \n\t"
		"mov %c[rbx](%0), %%"R"bx \n\t"
		"mov %c[rdx](%0), %%"R"dx \n\t"
		"mov %c[rsi](%0), %%"R"si \n\t"
		"mov %c[rdi](%0), %%"R"di \n\t"
		"mov %c[rbp](%0), %%"R"bp \n\t"
3464
#ifdef CONFIG_X86_64
3465 3466 3467 3468 3469 3470 3471 3472
		"mov %c[r8](%0),  %%r8  \n\t"
		"mov %c[r9](%0),  %%r9  \n\t"
		"mov %c[r10](%0), %%r10 \n\t"
		"mov %c[r11](%0), %%r11 \n\t"
		"mov %c[r12](%0), %%r12 \n\t"
		"mov %c[r13](%0), %%r13 \n\t"
		"mov %c[r14](%0), %%r14 \n\t"
		"mov %c[r15](%0), %%r15 \n\t"
A
Avi Kivity 已提交
3473
#endif
3474 3475
		"mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */

A
Avi Kivity 已提交
3476
		/* Enter guest mode */
3477
		"jne .Llaunched \n\t"
3478
		__ex(ASM_VMX_VMLAUNCH) "\n\t"
3479
		"jmp .Lkvm_vmx_return \n\t"
3480
		".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
3481
		".Lkvm_vmx_return: "
A
Avi Kivity 已提交
3482
		/* Save guest registers, load host registers, keep flags */
3483 3484 3485 3486 3487 3488 3489 3490
		"xchg %0,     (%%"R"sp) \n\t"
		"mov %%"R"ax, %c[rax](%0) \n\t"
		"mov %%"R"bx, %c[rbx](%0) \n\t"
		"push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t"
		"mov %%"R"dx, %c[rdx](%0) \n\t"
		"mov %%"R"si, %c[rsi](%0) \n\t"
		"mov %%"R"di, %c[rdi](%0) \n\t"
		"mov %%"R"bp, %c[rbp](%0) \n\t"
3491
#ifdef CONFIG_X86_64
3492 3493 3494 3495 3496 3497 3498 3499
		"mov %%r8,  %c[r8](%0) \n\t"
		"mov %%r9,  %c[r9](%0) \n\t"
		"mov %%r10, %c[r10](%0) \n\t"
		"mov %%r11, %c[r11](%0) \n\t"
		"mov %%r12, %c[r12](%0) \n\t"
		"mov %%r13, %c[r13](%0) \n\t"
		"mov %%r14, %c[r14](%0) \n\t"
		"mov %%r15, %c[r15](%0) \n\t"
A
Avi Kivity 已提交
3500
#endif
3501 3502 3503 3504
		"mov %%cr2, %%"R"ax   \n\t"
		"mov %%"R"ax, %c[cr2](%0) \n\t"

		"pop  %%"R"bp; pop  %%"R"bp; pop  %%"R"dx \n\t"
3505 3506 3507 3508
		"setbe %c[fail](%0) \n\t"
	      : : "c"(vmx), "d"((unsigned long)HOST_RSP),
		[launched]"i"(offsetof(struct vcpu_vmx, launched)),
		[fail]"i"(offsetof(struct vcpu_vmx, fail)),
3509
		[host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
3510 3511 3512 3513 3514 3515 3516
		[rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
		[rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
		[rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
		[rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
		[rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
		[rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
		[rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
3517
#ifdef CONFIG_X86_64
3518 3519 3520 3521 3522 3523 3524 3525
		[r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
		[r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
		[r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
		[r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
		[r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
		[r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
		[r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
		[r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
A
Avi Kivity 已提交
3526
#endif
3527
		[cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
3528
	      : "cc", "memory"
3529
		, R"bx", R"di", R"si"
3530 3531 3532 3533
#ifdef CONFIG_X86_64
		, "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
#endif
	      );
A
Avi Kivity 已提交
3534

3535 3536 3537
	vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
	vcpu->arch.regs_dirty = 0;

3538 3539
	get_debugreg(vcpu->arch.dr6, 6);

3540
	vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
3541 3542
	if (vmx->rmode.irq.pending)
		fixup_rmode_irq(vmx);
3543

3544
	vmx_update_window_states(vcpu);
A
Avi Kivity 已提交
3545

M
Mike Day 已提交
3546
	asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
3547
	vmx->launched = 1;
3548 3549 3550 3551

	intr_info = vmcs_read32(VM_EXIT_INTR_INFO);

	/* We need to handle NMIs before interrupts are enabled */
3552
	if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
3553
	    (intr_info & INTR_INFO_VALID_MASK)) {
F
Feng (Eric) Liu 已提交
3554
		KVMTRACE_0D(NMI, vcpu, handler);
3555
		asm("int $2");
F
Feng (Eric) Liu 已提交
3556
	}
3557 3558

	vmx_complete_interrupts(vmx);
A
Avi Kivity 已提交
3559 3560
}

3561 3562 3563
#undef R
#undef Q

A
Avi Kivity 已提交
3564 3565
static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
{
3566 3567 3568
	struct vcpu_vmx *vmx = to_vmx(vcpu);

	if (vmx->vmcs) {
3569
		vcpu_clear(vmx);
3570 3571
		free_vmcs(vmx->vmcs);
		vmx->vmcs = NULL;
A
Avi Kivity 已提交
3572 3573 3574 3575 3576
	}
}

static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
{
R
Rusty Russell 已提交
3577 3578
	struct vcpu_vmx *vmx = to_vmx(vcpu);

3579 3580 3581 3582
	spin_lock(&vmx_vpid_lock);
	if (vmx->vpid != 0)
		__clear_bit(vmx->vpid, vmx_vpid_bitmap);
	spin_unlock(&vmx_vpid_lock);
A
Avi Kivity 已提交
3583
	vmx_free_vmcs(vcpu);
R
Rusty Russell 已提交
3584 3585 3586
	kfree(vmx->host_msrs);
	kfree(vmx->guest_msrs);
	kvm_vcpu_uninit(vcpu);
3587
	kmem_cache_free(kvm_vcpu_cache, vmx);
A
Avi Kivity 已提交
3588 3589
}

R
Rusty Russell 已提交
3590
static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
A
Avi Kivity 已提交
3591
{
R
Rusty Russell 已提交
3592
	int err;
3593
	struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
3594
	int cpu;
A
Avi Kivity 已提交
3595

3596
	if (!vmx)
R
Rusty Russell 已提交
3597 3598
		return ERR_PTR(-ENOMEM);

3599 3600
	allocate_vpid(vmx);

R
Rusty Russell 已提交
3601 3602 3603
	err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
	if (err)
		goto free_vcpu;
3604

3605
	vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
R
Rusty Russell 已提交
3606 3607 3608 3609
	if (!vmx->guest_msrs) {
		err = -ENOMEM;
		goto uninit_vcpu;
	}
3610

3611 3612
	vmx->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!vmx->host_msrs)
R
Rusty Russell 已提交
3613
		goto free_guest_msrs;
3614

3615 3616
	vmx->vmcs = alloc_vmcs();
	if (!vmx->vmcs)
R
Rusty Russell 已提交
3617
		goto free_msrs;
3618 3619 3620

	vmcs_clear(vmx->vmcs);

3621 3622
	cpu = get_cpu();
	vmx_vcpu_load(&vmx->vcpu, cpu);
R
Rusty Russell 已提交
3623
	err = vmx_vcpu_setup(vmx);
R
Rusty Russell 已提交
3624
	vmx_vcpu_put(&vmx->vcpu);
3625
	put_cpu();
R
Rusty Russell 已提交
3626 3627
	if (err)
		goto free_vmcs;
3628 3629 3630
	if (vm_need_virtualize_apic_accesses(kvm))
		if (alloc_apic_access_page(kvm) != 0)
			goto free_vmcs;
R
Rusty Russell 已提交
3631

3632 3633 3634 3635
	if (vm_need_ept())
		if (alloc_identity_pagetable(kvm) != 0)
			goto free_vmcs;

R
Rusty Russell 已提交
3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646
	return &vmx->vcpu;

free_vmcs:
	free_vmcs(vmx->vmcs);
free_msrs:
	kfree(vmx->host_msrs);
free_guest_msrs:
	kfree(vmx->guest_msrs);
uninit_vcpu:
	kvm_vcpu_uninit(&vmx->vcpu);
free_vcpu:
3647
	kmem_cache_free(kvm_vcpu_cache, vmx);
R
Rusty Russell 已提交
3648
	return ERR_PTR(err);
A
Avi Kivity 已提交
3649 3650
}

Y
Yang, Sheng 已提交
3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664
static void __init vmx_check_processor_compat(void *rtn)
{
	struct vmcs_config vmcs_conf;

	*(int *)rtn = 0;
	if (setup_vmcs_config(&vmcs_conf) < 0)
		*(int *)rtn = -EIO;
	if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
		printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
				smp_processor_id());
		*(int *)rtn = -EIO;
	}
}

3665 3666 3667 3668 3669
static int get_ept_level(void)
{
	return VMX_EPT_DEFAULT_GAW + 1;
}

S
Sheng Yang 已提交
3670 3671 3672 3673 3674
static int vmx_get_mt_mask_shift(void)
{
	return VMX_EPT_MT_EPTE_SHIFT;
}

3675
static struct kvm_x86_ops vmx_x86_ops = {
A
Avi Kivity 已提交
3676 3677 3678 3679
	.cpu_has_kvm_support = cpu_has_kvm_support,
	.disabled_by_bios = vmx_disabled_by_bios,
	.hardware_setup = hardware_setup,
	.hardware_unsetup = hardware_unsetup,
Y
Yang, Sheng 已提交
3680
	.check_processor_compatibility = vmx_check_processor_compat,
A
Avi Kivity 已提交
3681 3682
	.hardware_enable = hardware_enable,
	.hardware_disable = hardware_disable,
3683
	.cpu_has_accelerated_tpr = cpu_has_vmx_virtualize_apic_accesses,
A
Avi Kivity 已提交
3684 3685 3686

	.vcpu_create = vmx_create_vcpu,
	.vcpu_free = vmx_free_vcpu,
3687
	.vcpu_reset = vmx_vcpu_reset,
A
Avi Kivity 已提交
3688

3689
	.prepare_guest_switch = vmx_save_host_state,
A
Avi Kivity 已提交
3690 3691 3692 3693 3694 3695 3696 3697 3698
	.vcpu_load = vmx_vcpu_load,
	.vcpu_put = vmx_vcpu_put,

	.set_guest_debug = set_guest_debug,
	.get_msr = vmx_get_msr,
	.set_msr = vmx_set_msr,
	.get_segment_base = vmx_get_segment_base,
	.get_segment = vmx_get_segment,
	.set_segment = vmx_set_segment,
3699
	.get_cpl = vmx_get_cpl,
A
Avi Kivity 已提交
3700
	.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
3701
	.decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
A
Avi Kivity 已提交
3702 3703 3704 3705 3706 3707 3708 3709
	.set_cr0 = vmx_set_cr0,
	.set_cr3 = vmx_set_cr3,
	.set_cr4 = vmx_set_cr4,
	.set_efer = vmx_set_efer,
	.get_idt = vmx_get_idt,
	.set_idt = vmx_set_idt,
	.get_gdt = vmx_get_gdt,
	.set_gdt = vmx_set_gdt,
3710
	.cache_reg = vmx_cache_reg,
A
Avi Kivity 已提交
3711 3712 3713 3714 3715 3716
	.get_rflags = vmx_get_rflags,
	.set_rflags = vmx_set_rflags,

	.tlb_flush = vmx_flush_tlb,

	.run = vmx_vcpu_run,
3717
	.handle_exit = kvm_handle_exit,
A
Avi Kivity 已提交
3718
	.skip_emulated_instruction = skip_emulated_instruction,
I
Ingo Molnar 已提交
3719
	.patch_hypercall = vmx_patch_hypercall,
E
Eddie Dong 已提交
3720 3721
	.get_irq = vmx_get_irq,
	.set_irq = vmx_inject_irq,
3722 3723
	.queue_exception = vmx_queue_exception,
	.exception_injected = vmx_exception_injected,
3724 3725
	.inject_pending_irq = vmx_intr_assist,
	.inject_pending_vectors = do_interrupt_requests,
3726 3727

	.set_tss_addr = vmx_set_tss_addr,
3728
	.get_tdp_level = get_ept_level,
S
Sheng Yang 已提交
3729
	.get_mt_mask_shift = vmx_get_mt_mask_shift,
A
Avi Kivity 已提交
3730 3731 3732 3733
};

static int __init vmx_init(void)
{
S
Sheng Yang 已提交
3734
	void *va;
3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746
	int r;

	vmx_io_bitmap_a = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
	if (!vmx_io_bitmap_a)
		return -ENOMEM;

	vmx_io_bitmap_b = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
	if (!vmx_io_bitmap_b) {
		r = -ENOMEM;
		goto out;
	}

S
Sheng Yang 已提交
3747 3748 3749 3750 3751 3752
	vmx_msr_bitmap = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
	if (!vmx_msr_bitmap) {
		r = -ENOMEM;
		goto out1;
	}

3753 3754 3755 3756
	/*
	 * Allow direct access to the PC debug port (it is often used for I/O
	 * delays, but the vmexits simply slow things down).
	 */
S
Sheng Yang 已提交
3757 3758 3759
	va = kmap(vmx_io_bitmap_a);
	memset(va, 0xff, PAGE_SIZE);
	clear_bit(0x80, va);
3760
	kunmap(vmx_io_bitmap_a);
3761

S
Sheng Yang 已提交
3762 3763
	va = kmap(vmx_io_bitmap_b);
	memset(va, 0xff, PAGE_SIZE);
3764
	kunmap(vmx_io_bitmap_b);
3765

S
Sheng Yang 已提交
3766 3767 3768 3769
	va = kmap(vmx_msr_bitmap);
	memset(va, 0xff, PAGE_SIZE);
	kunmap(vmx_msr_bitmap);

3770 3771
	set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */

3772
	r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE);
3773
	if (r)
S
Sheng Yang 已提交
3774 3775 3776 3777 3778 3779 3780
		goto out2;

	vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_FS_BASE);
	vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_GS_BASE);
	vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_CS);
	vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_ESP);
	vmx_disable_intercept_for_msr(vmx_msr_bitmap, MSR_IA32_SYSENTER_EIP);
3781

3782
	if (vm_need_ept()) {
3783
		bypass_guest_pf = 0;
3784
		kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK |
3785
			VMX_EPT_WRITABLE_MASK);
3786
		kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
S
Sheng Yang 已提交
3787 3788
				VMX_EPT_EXECUTABLE_MASK,
				VMX_EPT_DEFAULT_MT << VMX_EPT_MT_EPTE_SHIFT);
3789 3790 3791
		kvm_enable_tdp();
	} else
		kvm_disable_tdp();
3792

3793 3794 3795
	if (bypass_guest_pf)
		kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);

3796 3797
	ept_sync_global();

3798 3799
	return 0;

S
Sheng Yang 已提交
3800 3801
out2:
	__free_page(vmx_msr_bitmap);
3802 3803 3804 3805 3806
out1:
	__free_page(vmx_io_bitmap_b);
out:
	__free_page(vmx_io_bitmap_a);
	return r;
A
Avi Kivity 已提交
3807 3808 3809 3810
}

static void __exit vmx_exit(void)
{
S
Sheng Yang 已提交
3811
	__free_page(vmx_msr_bitmap);
3812 3813 3814
	__free_page(vmx_io_bitmap_b);
	__free_page(vmx_io_bitmap_a);

3815
	kvm_exit();
A
Avi Kivity 已提交
3816 3817 3818 3819
}

module_init(vmx_init)
module_exit(vmx_exit)