vmx.c 81.7 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 "vmx.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 <asm/io.h>
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#include <asm/desc.h>
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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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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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	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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};

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 DEFINE_PER_CPU(struct vmcs *, vmxarea);
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);

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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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struct vmx_capability {
	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)) ==
		(INTR_TYPE_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
}

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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)) ==
		(INTR_TYPE_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
}

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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)) ==
		(INTR_TYPE_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
}

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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 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 };

    asm volatile (ASM_VMX_INVVPID
		  /* 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};

	asm volatile (ASM_VMX_INVEPT
			/* 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;

	asm volatile (ASM_VMX_VMCLEAR_RAX "; setna %0"
		      : "=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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}

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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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	vmx->launched = 0;
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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;

	asm volatile (ASM_VMX_VMREAD_RDX_RAX
		      : "=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;

	asm volatile (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)
{
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#ifdef CONFIG_X86_64
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	vmcs_writel(field, value);
#else
	vmcs_writel(field, value);
	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;
	if (vcpu->guest_debug.enabled)
		eb |= 1u << 1;
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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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	get_gdt(&gdt);
	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 = 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 = 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 = read_gs();
	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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#endif
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	load_msrs(vmx->guest_msrs, vmx->save_nmsrs);
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	load_transition_efer(vmx);
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}

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static void __vmx_load_host_state(struct vcpu_vmx *vmx)
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{
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	unsigned long flags;
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	if (!vmx->host_state.loaded)
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		return;

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	++vmx->vcpu.stat.host_state_reload;
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	vmx->host_state.loaded = 0;
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	if (vmx->host_state.fs_reload_needed)
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		load_fs(vmx->host_state.fs_sel);
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	if (vmx->host_state.gs_ldt_reload_needed) {
		load_ldt(vmx->host_state.ldt_sel);
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		/*
		 * If we have to reload gs, we must take care to
		 * preserve our gs base.
		 */
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		local_irq_save(flags);
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		load_gs(vmx->host_state.gs_sel);
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#ifdef CONFIG_X86_64
		wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
#endif
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		local_irq_restore(flags);
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	}
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	reload_tss();
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	save_msrs(vmx->guest_msrs, vmx->save_nmsrs);
	load_msrs(vmx->host_msrs, vmx->save_nmsrs);
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	reload_host_efer(vmx);
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}

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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.
 */
610
static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
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{
612 613
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	u64 phys_addr = __pa(vmx->vmcs);
614
	u64 tsc_this, delta, new_offset;
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616
	if (vcpu->cpu != cpu) {
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		vcpu_clear(vmx);
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		kvm_migrate_timers(vcpu);
619
		vpid_sync_vcpu_all(vmx);
620
	}
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622
	if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
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		u8 error;

625
		per_cpu(current_vmcs, cpu) = vmx->vmcs;
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		asm volatile (ASM_VMX_VMPTRLD_RAX "; setna %0"
			      : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
			      : "cc");
		if (error)
			printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
631
			       vmx->vmcs, phys_addr);
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	}

	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.
		 */
		vmcs_writel(HOST_TR_BASE, read_tr_base()); /* 22.2.4 */
		get_gdt(&dt);
		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 */
649 650 651 652 653

		/*
		 * Make sure the time stamp counter is monotonous.
		 */
		rdtscll(tsc_this);
654 655 656 657 658
		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)
{
664
	__vmx_load_host_state(to_vmx(vcpu));
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}

667 668 669 670 671
static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
{
	if (vcpu->fpu_active)
		return;
	vcpu->fpu_active = 1;
672
	vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
673
	if (vcpu->arch.cr0 & X86_CR0_TS)
674
		vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
675 676 677 678 679 680 681 682
	update_exception_bitmap(vcpu);
}

static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
{
	if (!vcpu->fpu_active)
		return;
	vcpu->fpu_active = 0;
683
	vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
684 685 686
	update_exception_bitmap(vcpu);
}

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static void vmx_vcpu_decache(struct kvm_vcpu *vcpu)
{
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	vcpu_clear(to_vmx(vcpu));
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}

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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)
{
699
	if (vcpu->arch.rmode.active)
700
		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;

	rip = vmcs_readl(GUEST_RIP);
	rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
	vmcs_writel(GUEST_RIP, rip);

	/*
	 * 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);
721
	vcpu->arch.interrupt_window_open = 1;
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}

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static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
				bool has_error_code, u32 error_code)
{
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
		     nr | INTR_TYPE_EXCEPTION
729
		     | (has_error_code ? INTR_INFO_DELIVER_CODE_MASK : 0)
730 731 732 733 734 735 736 737 738 739 740 741
		     | INTR_INFO_VALID_MASK);
	if (has_error_code)
		vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
}

static bool vmx_exception_injected(struct kvm_vcpu *vcpu)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);

	return !(vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
}

742 743 744
/*
 * Swap MSR entry in host/guest MSR entry array.
 */
745
#ifdef CONFIG_X86_64
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static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
747
{
748 749 750 751 752 753 754 755
	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;
756
}
757
#endif
758

759 760 761 762 763
/*
 * 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.
 */
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static void setup_msrs(struct vcpu_vmx *vmx)
765
{
766
	int save_nmsrs;
767

768
	vmx_load_host_state(vmx);
769 770
	save_nmsrs = 0;
#ifdef CONFIG_X86_64
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	if (is_long_mode(&vmx->vcpu)) {
772 773
		int index;

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		index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
775
		if (index >= 0)
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			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_LSTAR);
778
		if (index >= 0)
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			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_CSTAR);
781
		if (index >= 0)
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			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_KERNEL_GS_BASE);
784
		if (index >= 0)
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			move_msr_up(vmx, index, save_nmsrs++);
786 787 788 789
		/*
		 * MSR_K6_STAR is only needed on long mode guests, and only
		 * if efer.sce is enabled.
		 */
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		index = __find_msr_index(vmx, MSR_K6_STAR);
791
		if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE))
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			move_msr_up(vmx, index, save_nmsrs++);
793 794
	}
#endif
795
	vmx->save_nmsrs = save_nmsrs;
796

797
#ifdef CONFIG_X86_64
798
	vmx->msr_offset_kernel_gs_base =
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		__find_msr_index(vmx, MSR_KERNEL_GS_BASE);
800
#endif
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	vmx->msr_offset_efer = __find_msr_index(vmx, MSR_EFER);
802 803
}

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/*
 * 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
 */
static void guest_write_tsc(u64 guest_tsc)
{
	u64 host_tsc;

	rdtscll(host_tsc);
	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;
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	struct kvm_msr_entry *msr;
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	if (!pdata) {
		printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
		return -EINVAL;
	}

	switch (msr_index) {
845
#ifdef CONFIG_X86_64
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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:
853
		return kvm_get_msr_common(vcpu, msr_index, pdata);
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#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:
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		data = vmcs_readl(GUEST_SYSENTER_EIP);
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		break;
	case MSR_IA32_SYSENTER_ESP:
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		data = vmcs_readl(GUEST_SYSENTER_ESP);
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		break;
	default:
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		msr = find_msr_entry(to_vmx(vcpu), msr_index);
869 870 871
		if (msr) {
			data = msr->data;
			break;
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		}
873
		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)
{
887 888
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	struct kvm_msr_entry *msr;
889 890
	int ret = 0;

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	switch (msr_index) {
892
#ifdef CONFIG_X86_64
893
	case MSR_EFER:
894
		vmx_load_host_state(vmx);
895 896
		ret = kvm_set_msr_common(vcpu, msr_index, data);
		break;
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	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:
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		vmcs_writel(GUEST_SYSENTER_EIP, data);
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		break;
	case MSR_IA32_SYSENTER_ESP:
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		vmcs_writel(GUEST_SYSENTER_ESP, data);
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		break;
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	case MSR_IA32_TIME_STAMP_COUNTER:
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		guest_write_tsc(data);
		break;
	default:
917
		vmx_load_host_state(vmx);
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		msr = find_msr_entry(vmx, msr_index);
919 920 921
		if (msr) {
			msr->data = data;
			break;
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		}
923
		ret = kvm_set_msr_common(vcpu, msr_index, data);
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	}

926
	return ret;
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}

/*
 * Sync the rsp and rip registers into the vcpu structure.  This allows
931
 * registers to be accessed by indexing vcpu->arch.regs.
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 */
static void vcpu_load_rsp_rip(struct kvm_vcpu *vcpu)
{
935 936
	vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
	vcpu->arch.rip = vmcs_readl(GUEST_RIP);
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}

/*
 * Syncs rsp and rip back into the vmcs.  Should be called after possible
 * modification.
 */
static void vcpu_put_rsp_rip(struct kvm_vcpu *vcpu)
{
945 946
	vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
	vmcs_writel(GUEST_RIP, vcpu->arch.rip);
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}

static int set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_debug_guest *dbg)
{
	unsigned long dr7 = 0x400;
	int old_singlestep;

	old_singlestep = vcpu->guest_debug.singlestep;

	vcpu->guest_debug.enabled = dbg->enabled;
	if (vcpu->guest_debug.enabled) {
		int i;

		dr7 |= 0x200;  /* exact */
		for (i = 0; i < 4; ++i) {
			if (!dbg->breakpoints[i].enabled)
				continue;
			vcpu->guest_debug.bp[i] = dbg->breakpoints[i].address;
			dr7 |= 2 << (i*2);    /* global enable */
			dr7 |= 0 << (i*4+16); /* execution breakpoint */
		}

		vcpu->guest_debug.singlestep = dbg->singlestep;
970
	} else
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		vcpu->guest_debug.singlestep = 0;

	if (old_singlestep && !vcpu->guest_debug.singlestep) {
		unsigned long flags;

		flags = vmcs_readl(GUEST_RFLAGS);
		flags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
		vmcs_writel(GUEST_RFLAGS, flags);
	}

981
	update_exception_bitmap(vcpu);
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	vmcs_writel(GUEST_DR7, dr7);

	return 0;
}

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static int vmx_get_irq(struct kvm_vcpu *vcpu)
{
989
	struct vcpu_vmx *vmx = to_vmx(vcpu);
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	u32 idtv_info_field;

992
	idtv_info_field = vmx->idt_vectoring_info;
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	if (idtv_info_field & INTR_INFO_VALID_MASK) {
		if (is_external_interrupt(idtv_info_field))
			return idtv_info_field & VECTORING_INFO_VECTOR_MASK;
		else
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			printk(KERN_DEBUG "pending exception: not handled yet\n");
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	}
	return -1;
}

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static __init int cpu_has_kvm_support(void)
{
	unsigned long ecx = cpuid_ecx(1);
	return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */
}

static __init int vmx_disabled_by_bios(void)
{
	u64 msr;

	rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
1013 1014 1015 1016
	return (msr & (MSR_IA32_FEATURE_CONTROL_LOCKED |
		       MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
	    == MSR_IA32_FEATURE_CONTROL_LOCKED;
	/* locked but not enabled */
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}

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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;

	rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
1026 1027 1028 1029
	if ((old & (MSR_IA32_FEATURE_CONTROL_LOCKED |
		    MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
	    != (MSR_IA32_FEATURE_CONTROL_LOCKED |
		MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED))
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		/* enable and lock */
1031 1032 1033
		wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
		       MSR_IA32_FEATURE_CONTROL_LOCKED |
		       MSR_IA32_FEATURE_CONTROL_VMXON_ENABLED);
1034
	write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
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	asm volatile (ASM_VMX_VMXON_RAX : : "a"(&phys_addr), "m"(phys_addr)
		      : "memory", "cc");
}

static void hardware_disable(void *garbage)
{
	asm volatile (ASM_VMX_VMXOFF : : : "cc");
1042
	write_cr4(read_cr4() & ~X86_CR4_VMXE);
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}

1045
static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
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				      u32 msr, u32 *result)
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{
	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)
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		return -EIO;
1059 1060 1061 1062 1063

	*result = ctl;
	return 0;
}

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static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
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{
	u32 vmx_msr_low, vmx_msr_high;
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	u32 min, opt, min2, opt2;
1068 1069
	u32 _pin_based_exec_control = 0;
	u32 _cpu_based_exec_control = 0;
1070
	u32 _cpu_based_2nd_exec_control = 0;
1071 1072 1073 1074 1075 1076 1077
	u32 _vmexit_control = 0;
	u32 _vmentry_control = 0;

	min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
	opt = 0;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
				&_pin_based_exec_control) < 0)
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		return -EIO;
1079 1080 1081 1082 1083 1084

	min = CPU_BASED_HLT_EXITING |
#ifdef CONFIG_X86_64
	      CPU_BASED_CR8_LOAD_EXITING |
	      CPU_BASED_CR8_STORE_EXITING |
#endif
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	      CPU_BASED_CR3_LOAD_EXITING |
	      CPU_BASED_CR3_STORE_EXITING |
1087 1088 1089
	      CPU_BASED_USE_IO_BITMAPS |
	      CPU_BASED_MOV_DR_EXITING |
	      CPU_BASED_USE_TSC_OFFSETING;
1090
	opt = CPU_BASED_TPR_SHADOW |
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	      CPU_BASED_USE_MSR_BITMAPS |
1092
	      CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1093 1094
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
				&_cpu_based_exec_control) < 0)
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		return -EIO;
1096 1097 1098 1099 1100
#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
1101
	if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
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		min2 = 0;
		opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
1104
			SECONDARY_EXEC_WBINVD_EXITING |
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			SECONDARY_EXEC_ENABLE_VPID |
			SECONDARY_EXEC_ENABLE_EPT;
		if (adjust_vmx_controls(min2, opt2,
					MSR_IA32_VMX_PROCBASED_CTLS2,
1109 1110 1111 1112 1113 1114 1115 1116
					&_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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	if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
		/* CR3 accesses don't need to cause VM Exits when EPT enabled */
		min &= ~(CPU_BASED_CR3_LOAD_EXITING |
			 CPU_BASED_CR3_STORE_EXITING);
		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);
	}
1127 1128 1129 1130 1131 1132 1133 1134

	min = 0;
#ifdef CONFIG_X86_64
	min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
#endif
	opt = 0;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
				&_vmexit_control) < 0)
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		return -EIO;
1136 1137 1138 1139

	min = opt = 0;
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
				&_vmentry_control) < 0)
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		return -EIO;
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	rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
1143 1144 1145

	/* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
	if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
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		return -EIO;
1147 1148 1149 1150

#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))
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		return -EIO;
1152 1153 1154 1155
#endif

	/* Require Write-Back (WB) memory type for VMCS accesses. */
	if (((vmx_msr_high >> 18) & 15) != 6)
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		return -EIO;
1157

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	vmcs_conf->size = vmx_msr_high & 0x1fff;
	vmcs_conf->order = get_order(vmcs_config.size);
	vmcs_conf->revision_id = vmx_msr_low;
1161

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	vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
	vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
1164
	vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
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	vmcs_conf->vmexit_ctrl         = _vmexit_control;
	vmcs_conf->vmentry_ctrl        = _vmentry_control;
1167 1168

	return 0;
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}
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static struct vmcs *alloc_vmcs_cpu(int cpu)
{
	int node = cpu_to_node(cpu);
	struct page *pages;
	struct vmcs *vmcs;

1177
	pages = alloc_pages_node(node, GFP_KERNEL, vmcs_config.order);
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	if (!pages)
		return NULL;
	vmcs = page_address(pages);
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	memset(vmcs, 0, vmcs_config.size);
	vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
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	return vmcs;
}

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

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

1196
static void free_kvm_area(void)
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{
	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)
{
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	if (setup_vmcs_config(&vmcs_config) < 0)
		return -EIO;
1226 1227 1228 1229

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

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	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];

1242
	if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
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		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;

1258
	vcpu->arch.rmode.active = 0;
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1260 1261 1262
	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);
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	flags = vmcs_readl(GUEST_RFLAGS);
1265
	flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
1266
	flags |= (vcpu->arch.rmode.save_iopl << IOPL_SHIFT);
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	vmcs_writel(GUEST_RFLAGS, flags);

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	vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
			(vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
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	update_exception_bitmap(vcpu);

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	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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	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);
}

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static gva_t rmode_tss_base(struct kvm *kvm)
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{
1289
	if (!kvm->arch.tss_addr) {
1290 1291 1292 1293
		gfn_t base_gfn = kvm->memslots[0].base_gfn +
				 kvm->memslots[0].npages - 3;
		return base_gfn << PAGE_SHIFT;
	}
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	return kvm->arch.tss_addr;
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}

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);
1305 1306
	vmcs_write16(sf->selector, save->base >> 4);
	vmcs_write32(sf->base, save->base & 0xfffff);
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	vmcs_write32(sf->limit, 0xffff);
	vmcs_write32(sf->ar_bytes, 0xf3);
}

static void enter_rmode(struct kvm_vcpu *vcpu)
{
	unsigned long flags;

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	vcpu->arch.rmode.active = 1;
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	vcpu->arch.rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
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	vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));

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

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	vcpu->arch.rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
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	vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);

	flags = vmcs_readl(GUEST_RFLAGS);
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	vcpu->arch.rmode.save_iopl
		= (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
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	flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
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	vmcs_writel(GUEST_RFLAGS, flags);
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	vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
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	update_exception_bitmap(vcpu);

	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);
1341
	vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1342 1343
	if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
		vmcs_writel(GUEST_CS_BASE, 0xf0000);
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	vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);

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	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);
1350

1351
	kvm_mmu_reset_context(vcpu);
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	init_rmode(vcpu->kvm);
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}

1355
#ifdef CONFIG_X86_64
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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",
1364
		       __func__);
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		vmcs_write32(GUEST_TR_AR_BYTES,
			     (guest_tr_ar & ~AR_TYPE_MASK)
			     | AR_TYPE_BUSY_64_TSS);
	}

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	vcpu->arch.shadow_efer |= EFER_LMA;
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	find_msr_entry(to_vmx(vcpu), MSR_EFER)->data |= EFER_LMA | EFER_LME;
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	vmcs_write32(VM_ENTRY_CONTROLS,
		     vmcs_read32(VM_ENTRY_CONTROLS)
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		     | VM_ENTRY_IA32E_MODE);
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}

static void exit_lmode(struct kvm_vcpu *vcpu)
{
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	vcpu->arch.shadow_efer &= ~EFER_LMA;
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	vmcs_write32(VM_ENTRY_CONTROLS,
		     vmcs_read32(VM_ENTRY_CONTROLS)
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		     & ~VM_ENTRY_IA32E_MODE);
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}

#endif

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static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
{
	vpid_sync_vcpu_all(to_vmx(vcpu));
}

1394
static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1395
{
1396 1397
	vcpu->arch.cr4 &= KVM_GUEST_CR4_MASK;
	vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & ~KVM_GUEST_CR4_MASK;
1398 1399
}

1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
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,
			     vmcs_config.cpu_based_exec_ctrl |
			     (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,
			     vmcs_config.cpu_based_exec_ctrl &
			     ~(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;
}

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static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
1455 1456 1457
	unsigned long hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) |
				KVM_VM_CR0_ALWAYS_ON;

1458 1459
	vmx_fpu_deactivate(vcpu);

1460
	if (vcpu->arch.rmode.active && (cr0 & X86_CR0_PE))
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		enter_pmode(vcpu);

1463
	if (!vcpu->arch.rmode.active && !(cr0 & X86_CR0_PE))
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		enter_rmode(vcpu);

1466
#ifdef CONFIG_X86_64
1467
	if (vcpu->arch.shadow_efer & EFER_LME) {
1468
		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
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			enter_lmode(vcpu);
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		if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
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			exit_lmode(vcpu);
	}
#endif

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	if (vm_need_ept())
		ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);

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	vmcs_writel(CR0_READ_SHADOW, cr0);
1479
	vmcs_writel(GUEST_CR0, hw_cr0);
1480
	vcpu->arch.cr0 = cr0;
1481

1482
	if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
1483
		vmx_fpu_activate(vcpu);
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}

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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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static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
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	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;
	}

1513
	vmx_flush_tlb(vcpu);
1514
	vmcs_writel(GUEST_CR3, guest_cr3);
1515
	if (vcpu->arch.cr0 & X86_CR0_PE)
1516
		vmx_fpu_deactivate(vcpu);
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}

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

1524
	vcpu->arch.cr4 = cr4;
1525 1526 1527 1528 1529
	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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}

static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
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	struct vcpu_vmx *vmx = to_vmx(vcpu);
	struct kvm_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
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1537
	vcpu->arch.shadow_efer = efer;
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	if (!msr)
		return;
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	if (efer & EFER_LMA) {
		vmcs_write32(VM_ENTRY_CONTROLS,
				     vmcs_read32(VM_ENTRY_CONTROLS) |
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				     VM_ENTRY_IA32E_MODE);
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		msr->data = efer;

	} else {
		vmcs_write32(VM_ENTRY_CONTROLS,
				     vmcs_read32(VM_ENTRY_CONTROLS) &
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				     ~VM_ENTRY_IA32E_MODE);
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		msr->data = efer & ~EFER_LME;
	}
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Rusty Russell 已提交
1553
	setup_msrs(vmx);
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1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585
}

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);
	if (ar & AR_UNUSABLE_MASK)
		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;
}

1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599
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;
}

1600
static u32 vmx_segment_access_rights(struct kvm_segment *var)
A
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1601 1602 1603
{
	u32 ar;

1604
	if (var->unusable)
A
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1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
		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;
	}
1616 1617
	if (ar == 0) /* a 0 value means unusable */
		ar = AR_UNUSABLE_MASK;
1618 1619 1620 1621 1622 1623 1624 1625 1626 1627

	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;

1628 1629 1630 1631 1632
	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);
1633 1634 1635 1636 1637
		return;
	}
	vmcs_writel(sf->base, var->base);
	vmcs_write32(sf->limit, var->limit);
	vmcs_write16(sf->selector, var->selector);
1638
	if (vcpu->arch.rmode.active && var->s) {
1639 1640 1641 1642 1643 1644 1645 1646
		/*
		 * 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);
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	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);
}

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static int init_rmode_tss(struct kvm *kvm)
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1683 1684
{
	gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
1685
	u16 data = 0;
1686
	int ret = 0;
1687
	int r;
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1689 1690
	r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
	if (r < 0)
1691
		goto out;
1692 1693 1694
	data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
	r = kvm_write_guest_page(kvm, fn++, &data, 0x66, sizeof(u16));
	if (r < 0)
1695
		goto out;
1696 1697
	r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
	if (r < 0)
1698
		goto out;
1699 1700
	r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
	if (r < 0)
1701
		goto out;
1702
	data = ~0;
1703 1704 1705
	r = kvm_write_guest_page(kvm, fn, &data,
				 RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
				 sizeof(u8));
1706
	if (r < 0)
1707 1708 1709 1710 1711
		goto out;

	ret = 1;
out:
	return ret;
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}

1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748
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;
}

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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);
	vmcs_write32(sf->ar_bytes, 0x93);
}

1759 1760 1761 1762 1763
static int alloc_apic_access_page(struct kvm *kvm)
{
	struct kvm_userspace_memory_region kvm_userspace_mem;
	int r = 0;

1764
	down_write(&kvm->slots_lock);
1765
	if (kvm->arch.apic_access_page)
1766 1767 1768 1769 1770 1771 1772 1773
		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;
1774 1775

	down_read(&current->mm->mmap_sem);
1776
	kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
1777
	up_read(&current->mm->mmap_sem);
1778
out:
1779
	up_write(&kvm->slots_lock);
1780 1781 1782
	return r;
}

1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807
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;

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

1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823
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);
}

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1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847
void vmx_disable_intercept_for_msr(struct page *msr_bitmap, u32 msr)
{
	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);
}

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/*
 * Sets up the vmcs for emulated real mode.
 */
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static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
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{
	u32 host_sysenter_cs;
	u32 junk;
	unsigned long a;
	struct descriptor_table dt;
	int i;
1858
	unsigned long kvm_vmx_return;
1859
	u32 exec_control;
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	/* I/O */
1862 1863
	vmcs_write64(IO_BITMAP_A, page_to_phys(vmx_io_bitmap_a));
	vmcs_write64(IO_BITMAP_B, page_to_phys(vmx_io_bitmap_b));
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S
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	if (cpu_has_vmx_msr_bitmap())
		vmcs_write64(MSR_BITMAP, page_to_phys(vmx_msr_bitmap));

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1868 1869 1870
	vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */

	/* Control */
1871 1872
	vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
		vmcs_config.pin_based_exec_ctrl);
1873 1874 1875 1876 1877 1878 1879 1880 1881

	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
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1882 1883 1884
	if (!vm_need_ept())
		exec_control |= CPU_BASED_CR3_STORE_EXITING |
				CPU_BASED_CR3_LOAD_EXITING;
1885
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
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Avi Kivity 已提交
1886

1887 1888 1889 1890 1891
	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;
1892 1893
		if (vmx->vpid == 0)
			exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
S
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1894 1895
		if (!vm_need_ept())
			exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
1896 1897
		vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
	}
1898

1899 1900
	vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
	vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
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1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
	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 */
	vmcs_write16(HOST_FS_SELECTOR, read_fs());    /* 22.2.4 */
	vmcs_write16(HOST_GS_SELECTOR, read_gs());    /* 22.2.4 */
	vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
1913
#ifdef CONFIG_X86_64
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	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 */

	get_idt(&dt);
	vmcs_writel(HOST_IDTR_BASE, dt.base);   /* 22.2.4 */

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	asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
1929
	vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
1930 1931 1932
	vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
	vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
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1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944

	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 */

	for (i = 0; i < NR_VMX_MSR; ++i) {
		u32 index = vmx_msr_index[i];
		u32 data_low, data_high;
		u64 data;
1945
		int j = vmx->nmsrs;
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		if (rdmsr_safe(index, &data_low, &data_high) < 0)
			continue;
1949 1950
		if (wrmsr_safe(index, data_low, data_high) < 0)
			continue;
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1951
		data = data_low | ((u64)data_high << 32);
1952 1953 1954 1955 1956
		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;
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1957 1958
	}

1959
	vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
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1960 1961

	/* 22.2.1, 20.8.1 */
1962 1963
	vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);

1964 1965 1966
	vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
	vmcs_writel(CR4_GUEST_HOST_MASK, KVM_GUEST_CR4_MASK);

1967

1968 1969 1970
	return 0;
}

1971 1972 1973 1974 1975 1976 1977 1978 1979
static int init_rmode(struct kvm *kvm)
{
	if (!init_rmode_tss(kvm))
		return 0;
	if (!init_rmode_identity_map(kvm))
		return 0;
	return 1;
}

1980 1981 1982 1983 1984 1985
static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	u64 msr;
	int ret;

1986
	down_read(&vcpu->kvm->slots_lock);
1987
	if (!init_rmode(vmx->vcpu.kvm)) {
1988 1989 1990 1991
		ret = -ENOMEM;
		goto out;
	}

1992
	vmx->vcpu.arch.rmode.active = 0;
1993

1994
	vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
1995
	kvm_set_cr8(&vmx->vcpu, 0);
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
	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);

	/*
	 * 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 {
2011 2012
		vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
		vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
	}
	vmcs_write32(GUEST_CS_LIMIT, 0xffff);
	vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);

	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)
		vmcs_writel(GUEST_RIP, 0xfff0);
	else
		vmcs_writel(GUEST_RIP, 0);
	vmcs_writel(GUEST_RSP, 0);

	/* todo: dr0 = dr1 = dr2 = dr3 = 0; dr6 = 0xffff0ff0 */
	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);

	guest_write_tsc(0);

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

	setup_msrs(vmx);

A
Avi Kivity 已提交
2064 2065
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */

2066 2067 2068 2069
	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,
2070
				page_to_phys(vmx->vcpu.arch.apic->regs_page));
2071 2072 2073 2074 2075
		vmcs_write32(TPR_THRESHOLD, 0);
	}

	if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
		vmcs_write64(APIC_ACCESS_ADDR,
2076
			     page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
A
Avi Kivity 已提交
2077

2078 2079 2080
	if (vmx->vpid != 0)
		vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);

2081 2082
	vmx->vcpu.arch.cr0 = 0x60000010;
	vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */
R
Rusty Russell 已提交
2083 2084 2085 2086
	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
2087

2088 2089
	vpid_sync_vcpu_all(vmx);

2090
	ret = 0;
A
Avi Kivity 已提交
2091 2092

out:
2093
	up_read(&vcpu->kvm->slots_lock);
A
Avi Kivity 已提交
2094 2095 2096
	return ret;
}

2097 2098
static void vmx_inject_irq(struct kvm_vcpu *vcpu, int irq)
{
2099 2100
	struct vcpu_vmx *vmx = to_vmx(vcpu);

F
Feng (Eric) Liu 已提交
2101 2102
	KVMTRACE_1D(INJ_VIRQ, vcpu, (u32)irq, handler);

2103
	if (vcpu->arch.rmode.active) {
2104 2105 2106
		vmx->rmode.irq.pending = true;
		vmx->rmode.irq.vector = irq;
		vmx->rmode.irq.rip = vmcs_readl(GUEST_RIP);
2107 2108 2109
		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			     irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2110
		vmcs_writel(GUEST_RIP, vmx->rmode.irq.rip - 1);
2111 2112 2113 2114 2115 2116
		return;
	}
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			irq | INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
}

A
Avi Kivity 已提交
2117 2118
static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
{
2119 2120
	int word_index = __ffs(vcpu->arch.irq_summary);
	int bit_index = __ffs(vcpu->arch.irq_pending[word_index]);
A
Avi Kivity 已提交
2121 2122
	int irq = word_index * BITS_PER_LONG + bit_index;

2123 2124 2125
	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);
2126
	vmx_inject_irq(vcpu, irq);
A
Avi Kivity 已提交
2127 2128
}

2129 2130 2131

static void do_interrupt_requests(struct kvm_vcpu *vcpu,
				       struct kvm_run *kvm_run)
A
Avi Kivity 已提交
2132
{
2133 2134
	u32 cpu_based_vm_exec_control;

2135
	vcpu->arch.interrupt_window_open =
2136 2137 2138
		((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
		 (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);

2139 2140
	if (vcpu->arch.interrupt_window_open &&
	    vcpu->arch.irq_summary &&
2141
	    !(vmcs_read32(VM_ENTRY_INTR_INFO_FIELD) & INTR_INFO_VALID_MASK))
A
Avi Kivity 已提交
2142
		/*
2143
		 * If interrupts enabled, and not blocked by sti or mov ss. Good.
A
Avi Kivity 已提交
2144 2145
		 */
		kvm_do_inject_irq(vcpu);
2146 2147

	cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
2148 2149
	if (!vcpu->arch.interrupt_window_open &&
	    (vcpu->arch.irq_summary || kvm_run->request_interrupt_window))
A
Avi Kivity 已提交
2150 2151 2152
		/*
		 * Interrupts blocked.  Wait for unblock.
		 */
2153 2154 2155 2156
		cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
	else
		cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
A
Avi Kivity 已提交
2157 2158
}

2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
{
	int ret;
	struct kvm_userspace_memory_region tss_mem = {
		.slot = 8,
		.guest_phys_addr = addr,
		.memory_size = PAGE_SIZE * 3,
		.flags = 0,
	};

	ret = kvm_set_memory_region(kvm, &tss_mem, 0);
	if (ret)
		return ret;
2172
	kvm->arch.tss_addr = addr;
2173 2174 2175
	return 0;
}

A
Avi Kivity 已提交
2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196
static void kvm_guest_debug_pre(struct kvm_vcpu *vcpu)
{
	struct kvm_guest_debug *dbg = &vcpu->guest_debug;

	set_debugreg(dbg->bp[0], 0);
	set_debugreg(dbg->bp[1], 1);
	set_debugreg(dbg->bp[2], 2);
	set_debugreg(dbg->bp[3], 3);

	if (dbg->singlestep) {
		unsigned long flags;

		flags = vmcs_readl(GUEST_RFLAGS);
		flags |= X86_EFLAGS_TF | X86_EFLAGS_RF;
		vmcs_writel(GUEST_RFLAGS, flags);
	}
}

static int handle_rmode_exception(struct kvm_vcpu *vcpu,
				  int vec, u32 err_code)
{
2197
	if (!vcpu->arch.rmode.active)
A
Avi Kivity 已提交
2198 2199
		return 0;

2200 2201 2202 2203 2204
	/*
	 * 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)
2205
		if (emulate_instruction(vcpu, NULL, 0, 0, 0) == EMULATE_DONE)
A
Avi Kivity 已提交
2206 2207 2208 2209 2210 2211
			return 1;
	return 0;
}

static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2212
	struct vcpu_vmx *vmx = to_vmx(vcpu);
A
Avi Kivity 已提交
2213 2214 2215 2216 2217
	u32 intr_info, error_code;
	unsigned long cr2, rip;
	u32 vect_info;
	enum emulation_result er;

2218
	vect_info = vmx->idt_vectoring_info;
A
Avi Kivity 已提交
2219 2220 2221
	intr_info = vmcs_read32(VM_EXIT_INTR_INFO);

	if ((vect_info & VECTORING_INFO_VALID_MASK) &&
M
Mike Day 已提交
2222
						!is_page_fault(intr_info))
A
Avi Kivity 已提交
2223
		printk(KERN_ERR "%s: unexpected, vectoring info 0x%x "
2224
		       "intr info 0x%x\n", __func__, vect_info, intr_info);
A
Avi Kivity 已提交
2225

2226
	if (!irqchip_in_kernel(vcpu->kvm) && is_external_interrupt(vect_info)) {
A
Avi Kivity 已提交
2227
		int irq = vect_info & VECTORING_INFO_VECTOR_MASK;
2228 2229
		set_bit(irq, vcpu->arch.irq_pending);
		set_bit(irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
A
Avi Kivity 已提交
2230 2231
	}

2232 2233
	if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) /* nmi */
		return 1;  /* already handled by vmx_vcpu_run() */
2234 2235

	if (is_no_device(intr_info)) {
2236
		vmx_fpu_activate(vcpu);
2237 2238 2239
		return 1;
	}

2240
	if (is_invalid_opcode(intr_info)) {
2241
		er = emulate_instruction(vcpu, kvm_run, 0, 0, EMULTYPE_TRAP_UD);
2242
		if (er != EMULATE_DONE)
2243
			kvm_queue_exception(vcpu, UD_VECTOR);
2244 2245 2246
		return 1;
	}

A
Avi Kivity 已提交
2247 2248
	error_code = 0;
	rip = vmcs_readl(GUEST_RIP);
2249
	if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
A
Avi Kivity 已提交
2250 2251
		error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
	if (is_page_fault(intr_info)) {
2252 2253 2254
		/* EPT won't cause page fault directly */
		if (vm_need_ept())
			BUG();
A
Avi Kivity 已提交
2255
		cr2 = vmcs_readl(EXIT_QUALIFICATION);
F
Feng (Eric) Liu 已提交
2256 2257
		KVMTRACE_3D(PAGE_FAULT, vcpu, error_code, (u32)cr2,
			    (u32)((u64)cr2 >> 32), handler);
2258
		return kvm_mmu_page_fault(vcpu, cr2, error_code);
A
Avi Kivity 已提交
2259 2260
	}

2261
	if (vcpu->arch.rmode.active &&
A
Avi Kivity 已提交
2262
	    handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
2263
								error_code)) {
2264 2265
		if (vcpu->arch.halt_request) {
			vcpu->arch.halt_request = 0;
2266 2267
			return kvm_emulate_halt(vcpu);
		}
A
Avi Kivity 已提交
2268
		return 1;
2269
	}
A
Avi Kivity 已提交
2270

M
Mike Day 已提交
2271 2272
	if ((intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK)) ==
	    (INTR_TYPE_EXCEPTION | 1)) {
A
Avi Kivity 已提交
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284
		kvm_run->exit_reason = KVM_EXIT_DEBUG;
		return 0;
	}
	kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
	kvm_run->ex.exception = intr_info & INTR_INFO_VECTOR_MASK;
	kvm_run->ex.error_code = error_code;
	return 0;
}

static int handle_external_interrupt(struct kvm_vcpu *vcpu,
				     struct kvm_run *kvm_run)
{
A
Avi Kivity 已提交
2285
	++vcpu->stat.irq_exits;
F
Feng (Eric) Liu 已提交
2286
	KVMTRACE_1D(INTR, vcpu, vmcs_read32(VM_EXIT_INTR_INFO), handler);
A
Avi Kivity 已提交
2287 2288 2289
	return 1;
}

2290 2291 2292 2293 2294
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
2295 2296 2297

static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2298
	unsigned long exit_qualification;
2299 2300
	int size, down, in, string, rep;
	unsigned port;
A
Avi Kivity 已提交
2301

A
Avi Kivity 已提交
2302
	++vcpu->stat.io_exits;
2303
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2304
	string = (exit_qualification & 16) != 0;
2305 2306

	if (string) {
2307 2308
		if (emulate_instruction(vcpu,
					kvm_run, 0, 0, 0) == EMULATE_DO_MMIO)
2309 2310 2311 2312 2313 2314
			return 0;
		return 1;
	}

	size = (exit_qualification & 7) + 1;
	in = (exit_qualification & 8) != 0;
2315 2316 2317
	down = (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_DF) != 0;
	rep = (exit_qualification & 32) != 0;
	port = exit_qualification >> 16;
2318

L
Laurent Vivier 已提交
2319
	return kvm_emulate_pio(vcpu, kvm_run, in, size, port);
A
Avi Kivity 已提交
2320 2321
}

I
Ingo Molnar 已提交
2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332
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
2333 2334
static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2335
	unsigned long exit_qualification;
A
Avi Kivity 已提交
2336 2337 2338
	int cr;
	int reg;

2339
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
A
Avi Kivity 已提交
2340 2341 2342 2343
	cr = exit_qualification & 15;
	reg = (exit_qualification >> 8) & 15;
	switch ((exit_qualification >> 4) & 3) {
	case 0: /* mov to cr */
F
Feng (Eric) Liu 已提交
2344 2345
		KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr, (u32)vcpu->arch.regs[reg],
			    (u32)((u64)vcpu->arch.regs[reg] >> 32), handler);
A
Avi Kivity 已提交
2346 2347 2348
		switch (cr) {
		case 0:
			vcpu_load_rsp_rip(vcpu);
2349
			kvm_set_cr0(vcpu, vcpu->arch.regs[reg]);
A
Avi Kivity 已提交
2350 2351 2352 2353
			skip_emulated_instruction(vcpu);
			return 1;
		case 3:
			vcpu_load_rsp_rip(vcpu);
2354
			kvm_set_cr3(vcpu, vcpu->arch.regs[reg]);
A
Avi Kivity 已提交
2355 2356 2357 2358
			skip_emulated_instruction(vcpu);
			return 1;
		case 4:
			vcpu_load_rsp_rip(vcpu);
2359
			kvm_set_cr4(vcpu, vcpu->arch.regs[reg]);
A
Avi Kivity 已提交
2360 2361 2362 2363
			skip_emulated_instruction(vcpu);
			return 1;
		case 8:
			vcpu_load_rsp_rip(vcpu);
2364
			kvm_set_cr8(vcpu, vcpu->arch.regs[reg]);
A
Avi Kivity 已提交
2365
			skip_emulated_instruction(vcpu);
2366 2367
			if (irqchip_in_kernel(vcpu->kvm))
				return 1;
2368 2369
			kvm_run->exit_reason = KVM_EXIT_SET_TPR;
			return 0;
A
Avi Kivity 已提交
2370 2371
		};
		break;
2372 2373
	case 2: /* clts */
		vcpu_load_rsp_rip(vcpu);
2374
		vmx_fpu_deactivate(vcpu);
2375 2376
		vcpu->arch.cr0 &= ~X86_CR0_TS;
		vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
2377
		vmx_fpu_activate(vcpu);
F
Feng (Eric) Liu 已提交
2378
		KVMTRACE_0D(CLTS, vcpu, handler);
2379 2380
		skip_emulated_instruction(vcpu);
		return 1;
A
Avi Kivity 已提交
2381 2382 2383 2384
	case 1: /*mov from cr*/
		switch (cr) {
		case 3:
			vcpu_load_rsp_rip(vcpu);
2385
			vcpu->arch.regs[reg] = vcpu->arch.cr3;
A
Avi Kivity 已提交
2386
			vcpu_put_rsp_rip(vcpu);
F
Feng (Eric) Liu 已提交
2387 2388 2389 2390
			KVMTRACE_3D(CR_READ, vcpu, (u32)cr,
				    (u32)vcpu->arch.regs[reg],
				    (u32)((u64)vcpu->arch.regs[reg] >> 32),
				    handler);
A
Avi Kivity 已提交
2391 2392 2393 2394
			skip_emulated_instruction(vcpu);
			return 1;
		case 8:
			vcpu_load_rsp_rip(vcpu);
2395
			vcpu->arch.regs[reg] = kvm_get_cr8(vcpu);
A
Avi Kivity 已提交
2396
			vcpu_put_rsp_rip(vcpu);
F
Feng (Eric) Liu 已提交
2397 2398
			KVMTRACE_2D(CR_READ, vcpu, (u32)cr,
				    (u32)vcpu->arch.regs[reg], handler);
A
Avi Kivity 已提交
2399 2400 2401 2402 2403
			skip_emulated_instruction(vcpu);
			return 1;
		}
		break;
	case 3: /* lmsw */
2404
		kvm_lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
A
Avi Kivity 已提交
2405 2406 2407 2408 2409 2410 2411

		skip_emulated_instruction(vcpu);
		return 1;
	default:
		break;
	}
	kvm_run->exit_reason = 0;
2412
	pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
A
Avi Kivity 已提交
2413 2414 2415 2416 2417 2418
	       (int)(exit_qualification >> 4) & 3, cr);
	return 0;
}

static int handle_dr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2419
	unsigned long exit_qualification;
A
Avi Kivity 已提交
2420 2421 2422 2423 2424 2425 2426
	unsigned long val;
	int dr, reg;

	/*
	 * FIXME: this code assumes the host is debugging the guest.
	 *        need to deal with guest debugging itself too.
	 */
2427
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
A
Avi Kivity 已提交
2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442
	dr = exit_qualification & 7;
	reg = (exit_qualification >> 8) & 15;
	vcpu_load_rsp_rip(vcpu);
	if (exit_qualification & 16) {
		/* mov from dr */
		switch (dr) {
		case 6:
			val = 0xffff0ff0;
			break;
		case 7:
			val = 0x400;
			break;
		default:
			val = 0;
		}
2443
		vcpu->arch.regs[reg] = val;
F
Feng (Eric) Liu 已提交
2444
		KVMTRACE_2D(DR_READ, vcpu, (u32)dr, (u32)val, handler);
A
Avi Kivity 已提交
2445 2446 2447 2448 2449 2450 2451 2452 2453 2454
	} else {
		/* mov to dr */
	}
	vcpu_put_rsp_rip(vcpu);
	skip_emulated_instruction(vcpu);
	return 1;
}

static int handle_cpuid(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2455 2456
	kvm_emulate_cpuid(vcpu);
	return 1;
A
Avi Kivity 已提交
2457 2458 2459 2460
}

static int handle_rdmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2461
	u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
A
Avi Kivity 已提交
2462 2463 2464
	u64 data;

	if (vmx_get_msr(vcpu, ecx, &data)) {
2465
		kvm_inject_gp(vcpu, 0);
A
Avi Kivity 已提交
2466 2467 2468
		return 1;
	}

F
Feng (Eric) Liu 已提交
2469 2470 2471
	KVMTRACE_3D(MSR_READ, vcpu, ecx, (u32)data, (u32)(data >> 32),
		    handler);

A
Avi Kivity 已提交
2472
	/* FIXME: handling of bits 32:63 of rax, rdx */
2473 2474
	vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
	vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
A
Avi Kivity 已提交
2475 2476 2477 2478 2479 2480
	skip_emulated_instruction(vcpu);
	return 1;
}

static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2481 2482 2483
	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
2484

F
Feng (Eric) Liu 已提交
2485 2486 2487
	KVMTRACE_3D(MSR_WRITE, vcpu, ecx, (u32)data, (u32)(data >> 32),
		    handler);

A
Avi Kivity 已提交
2488
	if (vmx_set_msr(vcpu, ecx, data) != 0) {
2489
		kvm_inject_gp(vcpu, 0);
A
Avi Kivity 已提交
2490 2491 2492 2493 2494 2495 2496
		return 1;
	}

	skip_emulated_instruction(vcpu);
	return 1;
}

2497 2498 2499 2500 2501 2502
static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu,
				      struct kvm_run *kvm_run)
{
	return 1;
}

A
Avi Kivity 已提交
2503 2504 2505
static int handle_interrupt_window(struct kvm_vcpu *vcpu,
				   struct kvm_run *kvm_run)
{
2506 2507 2508 2509 2510 2511
	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
2512 2513 2514

	KVMTRACE_0D(PEND_INTR, vcpu, handler);

2515 2516 2517 2518 2519
	/*
	 * If the user space waits to inject interrupts, exit as soon as
	 * possible
	 */
	if (kvm_run->request_interrupt_window &&
2520
	    !vcpu->arch.irq_summary) {
2521
		kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
A
Avi Kivity 已提交
2522
		++vcpu->stat.irq_window_exits;
2523 2524
		return 0;
	}
A
Avi Kivity 已提交
2525 2526 2527 2528 2529 2530
	return 1;
}

static int handle_halt(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	skip_emulated_instruction(vcpu);
2531
	return kvm_emulate_halt(vcpu);
A
Avi Kivity 已提交
2532 2533
}

2534 2535
static int handle_vmcall(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
2536
	skip_emulated_instruction(vcpu);
2537 2538
	kvm_emulate_hypercall(vcpu);
	return 1;
2539 2540
}

E
Eddie Dong 已提交
2541 2542 2543 2544 2545 2546 2547
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;
}

2548 2549 2550 2551 2552 2553 2554 2555 2556
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;

F
Feng (Eric) Liu 已提交
2557 2558
	KVMTRACE_1D(APIC_ACCESS, vcpu, (u32)offset, handler);

2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569
	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;
}

2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583
static int handle_task_switch(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
	unsigned long exit_qualification;
	u16 tss_selector;
	int reason;

	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);

	reason = (u32)exit_qualification >> 30;
	tss_selector = exit_qualification;

	return kvm_task_switch(vcpu, tss_selector, reason);
}

2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641
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;
}

A
Avi Kivity 已提交
2642 2643 2644 2645 2646 2647 2648 2649 2650
/*
 * 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,
2651
	[EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
A
Avi Kivity 已提交
2652 2653 2654 2655 2656 2657 2658 2659
	[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,
2660
	[EXIT_REASON_VMCALL]                  = handle_vmcall,
2661 2662
	[EXIT_REASON_TPR_BELOW_THRESHOLD]     = handle_tpr_below_threshold,
	[EXIT_REASON_APIC_ACCESS]             = handle_apic_access,
E
Eddie Dong 已提交
2663
	[EXIT_REASON_WBINVD]                  = handle_wbinvd,
2664
	[EXIT_REASON_TASK_SWITCH]             = handle_task_switch,
2665
	[EXIT_REASON_EPT_VIOLATION]	      = handle_ept_violation,
A
Avi Kivity 已提交
2666 2667 2668
};

static const int kvm_vmx_max_exit_handlers =
2669
	ARRAY_SIZE(kvm_vmx_exit_handlers);
A
Avi Kivity 已提交
2670 2671 2672 2673 2674 2675 2676 2677

/*
 * 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);
2678
	struct vcpu_vmx *vmx = to_vmx(vcpu);
2679
	u32 vectoring_info = vmx->idt_vectoring_info;
2680

F
Feng (Eric) Liu 已提交
2681 2682 2683
	KVMTRACE_3D(VMEXIT, vcpu, exit_reason, (u32)vmcs_readl(GUEST_RIP),
		    (u32)((u64)vmcs_readl(GUEST_RIP) >> 32), entryexit);

2684 2685 2686 2687 2688 2689 2690
	/* 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);
	}

2691 2692 2693 2694 2695 2696
	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
2697

M
Mike Day 已提交
2698
	if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
2699 2700
			(exit_reason != EXIT_REASON_EXCEPTION_NMI &&
			exit_reason != EXIT_REASON_EPT_VIOLATION))
A
Avi Kivity 已提交
2701
		printk(KERN_WARNING "%s: unexpected, valid vectoring info and "
2702
		       "exit reason is 0x%x\n", __func__, exit_reason);
A
Avi Kivity 已提交
2703 2704 2705 2706 2707 2708 2709 2710 2711 2712
	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;
}

2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729
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);
}

2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740
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 vmx_intr_assist(struct kvm_vcpu *vcpu)
{
2741
	struct vcpu_vmx *vmx = to_vmx(vcpu);
2742 2743
	u32 idtv_info_field, intr_info_field;
	int has_ext_irq, interrupt_window_open;
2744
	int vector;
2745

2746 2747
	update_tpr_threshold(vcpu);

2748 2749
	has_ext_irq = kvm_cpu_has_interrupt(vcpu);
	intr_info_field = vmcs_read32(VM_ENTRY_INTR_INFO_FIELD);
2750
	idtv_info_field = vmx->idt_vectoring_info;
2751 2752 2753
	if (intr_info_field & INTR_INFO_VALID_MASK) {
		if (idtv_info_field & INTR_INFO_VALID_MASK) {
			/* TODO: fault when IDT_Vectoring */
2754 2755
			if (printk_ratelimit())
				printk(KERN_ERR "Fault when IDT_Vectoring\n");
2756 2757 2758 2759 2760 2761
		}
		if (has_ext_irq)
			enable_irq_window(vcpu);
		return;
	}
	if (unlikely(idtv_info_field & INTR_INFO_VALID_MASK)) {
2762 2763
		if ((idtv_info_field & VECTORING_INFO_TYPE_MASK)
		    == INTR_TYPE_EXT_INTR
2764
		    && vcpu->arch.rmode.active) {
2765 2766 2767 2768 2769 2770 2771 2772
			u8 vect = idtv_info_field & VECTORING_INFO_VECTOR_MASK;

			vmx_inject_irq(vcpu, vect);
			if (unlikely(has_ext_irq))
				enable_irq_window(vcpu);
			return;
		}

F
Feng (Eric) Liu 已提交
2773 2774
		KVMTRACE_1D(REDELIVER_EVT, vcpu, idtv_info_field, handler);

2775 2776 2777 2778
		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, idtv_info_field);
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
				vmcs_read32(VM_EXIT_INSTRUCTION_LEN));

2779
		if (unlikely(idtv_info_field & INTR_INFO_DELIVER_CODE_MASK))
2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790
			vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
				vmcs_read32(IDT_VECTORING_ERROR_CODE));
		if (unlikely(has_ext_irq))
			enable_irq_window(vcpu);
		return;
	}
	if (!has_ext_irq)
		return;
	interrupt_window_open =
		((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
		 (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);
2791 2792 2793 2794 2795
	if (interrupt_window_open) {
		vector = kvm_cpu_get_interrupt(vcpu);
		vmx_inject_irq(vcpu, vector);
		kvm_timer_intr_post(vcpu, vector);
	} else
2796 2797 2798
		enable_irq_window(vcpu);
}

2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821
/*
 * 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;
	if (vmcs_readl(GUEST_RIP) + 1 != vmx->rmode.irq.rip)
		return;
	vmcs_writel(GUEST_RIP, vmx->rmode.irq.rip);
	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;
}

2822
static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
A
Avi Kivity 已提交
2823
{
2824
	struct vcpu_vmx *vmx = to_vmx(vcpu);
2825
	u32 intr_info;
2826 2827 2828 2829 2830 2831

	/*
	 * Loading guest fpu may have cleared host cr0.ts
	 */
	vmcs_writel(HOST_CR0, read_cr0());

M
Mike Day 已提交
2832
	asm(
A
Avi Kivity 已提交
2833
		/* Store host registers */
2834
#ifdef CONFIG_X86_64
2835
		"push %%rdx; push %%rbp;"
A
Avi Kivity 已提交
2836 2837
		"push %%rcx \n\t"
#else
2838 2839
		"push %%edx; push %%ebp;"
		"push %%ecx \n\t"
A
Avi Kivity 已提交
2840
#endif
2841
		ASM_VMX_VMWRITE_RSP_RDX "\n\t"
A
Avi Kivity 已提交
2842
		/* Check if vmlaunch of vmresume is needed */
2843
		"cmpl $0, %c[launched](%0) \n\t"
A
Avi Kivity 已提交
2844
		/* Load guest registers.  Don't clobber flags. */
2845
#ifdef CONFIG_X86_64
2846
		"mov %c[cr2](%0), %%rax \n\t"
A
Avi Kivity 已提交
2847
		"mov %%rax, %%cr2 \n\t"
2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862
		"mov %c[rax](%0), %%rax \n\t"
		"mov %c[rbx](%0), %%rbx \n\t"
		"mov %c[rdx](%0), %%rdx \n\t"
		"mov %c[rsi](%0), %%rsi \n\t"
		"mov %c[rdi](%0), %%rdi \n\t"
		"mov %c[rbp](%0), %%rbp \n\t"
		"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"
		"mov %c[rcx](%0), %%rcx \n\t" /* kills %0 (rcx) */
A
Avi Kivity 已提交
2863
#else
2864
		"mov %c[cr2](%0), %%eax \n\t"
A
Avi Kivity 已提交
2865
		"mov %%eax,   %%cr2 \n\t"
2866 2867 2868 2869 2870 2871 2872
		"mov %c[rax](%0), %%eax \n\t"
		"mov %c[rbx](%0), %%ebx \n\t"
		"mov %c[rdx](%0), %%edx \n\t"
		"mov %c[rsi](%0), %%esi \n\t"
		"mov %c[rdi](%0), %%edi \n\t"
		"mov %c[rbp](%0), %%ebp \n\t"
		"mov %c[rcx](%0), %%ecx \n\t" /* kills %0 (ecx) */
A
Avi Kivity 已提交
2873 2874
#endif
		/* Enter guest mode */
2875
		"jne .Llaunched \n\t"
A
Avi Kivity 已提交
2876
		ASM_VMX_VMLAUNCH "\n\t"
2877 2878 2879
		"jmp .Lkvm_vmx_return \n\t"
		".Llaunched: " ASM_VMX_VMRESUME "\n\t"
		".Lkvm_vmx_return: "
A
Avi Kivity 已提交
2880
		/* Save guest registers, load host registers, keep flags */
2881
#ifdef CONFIG_X86_64
2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897
		"xchg %0,     (%%rsp) \n\t"
		"mov %%rax, %c[rax](%0) \n\t"
		"mov %%rbx, %c[rbx](%0) \n\t"
		"pushq (%%rsp); popq %c[rcx](%0) \n\t"
		"mov %%rdx, %c[rdx](%0) \n\t"
		"mov %%rsi, %c[rsi](%0) \n\t"
		"mov %%rdi, %c[rdi](%0) \n\t"
		"mov %%rbp, %c[rbp](%0) \n\t"
		"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
2898
		"mov %%cr2, %%rax   \n\t"
2899
		"mov %%rax, %c[cr2](%0) \n\t"
A
Avi Kivity 已提交
2900

2901
		"pop  %%rbp; pop  %%rbp; pop  %%rdx \n\t"
A
Avi Kivity 已提交
2902
#else
2903 2904 2905 2906 2907 2908 2909 2910
		"xchg %0, (%%esp) \n\t"
		"mov %%eax, %c[rax](%0) \n\t"
		"mov %%ebx, %c[rbx](%0) \n\t"
		"pushl (%%esp); popl %c[rcx](%0) \n\t"
		"mov %%edx, %c[rdx](%0) \n\t"
		"mov %%esi, %c[rsi](%0) \n\t"
		"mov %%edi, %c[rdi](%0) \n\t"
		"mov %%ebp, %c[rbp](%0) \n\t"
A
Avi Kivity 已提交
2911
		"mov %%cr2, %%eax  \n\t"
2912
		"mov %%eax, %c[cr2](%0) \n\t"
A
Avi Kivity 已提交
2913

2914
		"pop %%ebp; pop %%ebp; pop %%edx \n\t"
A
Avi Kivity 已提交
2915
#endif
2916 2917 2918 2919
		"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)),
2920 2921 2922 2923 2924 2925 2926
		[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])),
2927
#ifdef CONFIG_X86_64
2928 2929 2930 2931 2932 2933 2934 2935
		[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
2936
#endif
2937
		[cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
2938 2939 2940 2941
	      : "cc", "memory"
#ifdef CONFIG_X86_64
		, "rbx", "rdi", "rsi"
		, "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
2942 2943
#else
		, "ebx", "edi", "rsi"
2944 2945
#endif
	      );
A
Avi Kivity 已提交
2946

2947
	vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
2948 2949
	if (vmx->rmode.irq.pending)
		fixup_rmode_irq(vmx);
2950

2951
	vcpu->arch.interrupt_window_open =
M
Mike Day 已提交
2952
		(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0;
A
Avi Kivity 已提交
2953

M
Mike Day 已提交
2954
	asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
2955
	vmx->launched = 1;
2956 2957 2958 2959

	intr_info = vmcs_read32(VM_EXIT_INTR_INFO);

	/* We need to handle NMIs before interrupts are enabled */
F
Feng (Eric) Liu 已提交
2960 2961
	if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */
		KVMTRACE_0D(NMI, vcpu, handler);
2962
		asm("int $2");
F
Feng (Eric) Liu 已提交
2963
	}
A
Avi Kivity 已提交
2964 2965 2966 2967
}

static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
{
2968 2969 2970
	struct vcpu_vmx *vmx = to_vmx(vcpu);

	if (vmx->vmcs) {
2971
		on_each_cpu(__vcpu_clear, vmx, 1);
2972 2973
		free_vmcs(vmx->vmcs);
		vmx->vmcs = NULL;
A
Avi Kivity 已提交
2974 2975 2976 2977 2978
	}
}

static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
{
R
Rusty Russell 已提交
2979 2980
	struct vcpu_vmx *vmx = to_vmx(vcpu);

2981 2982 2983 2984
	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
2985
	vmx_free_vmcs(vcpu);
R
Rusty Russell 已提交
2986 2987 2988
	kfree(vmx->host_msrs);
	kfree(vmx->guest_msrs);
	kvm_vcpu_uninit(vcpu);
2989
	kmem_cache_free(kvm_vcpu_cache, vmx);
A
Avi Kivity 已提交
2990 2991
}

R
Rusty Russell 已提交
2992
static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
A
Avi Kivity 已提交
2993
{
R
Rusty Russell 已提交
2994
	int err;
2995
	struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
2996
	int cpu;
A
Avi Kivity 已提交
2997

2998
	if (!vmx)
R
Rusty Russell 已提交
2999 3000
		return ERR_PTR(-ENOMEM);

3001
	allocate_vpid(vmx);
3002 3003 3004 3005 3006 3007 3008 3009 3010
	if (id == 0 && vm_need_ept()) {
		kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK |
			VMX_EPT_WRITABLE_MASK |
			VMX_EPT_DEFAULT_MT << VMX_EPT_MT_EPTE_SHIFT);
		kvm_mmu_set_mask_ptes(0ull, VMX_EPT_FAKE_ACCESSED_MASK,
				VMX_EPT_FAKE_DIRTY_MASK, 0ull,
				VMX_EPT_EXECUTABLE_MASK);
		kvm_enable_tdp();
	}
3011

R
Rusty Russell 已提交
3012 3013 3014
	err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
	if (err)
		goto free_vcpu;
3015

3016
	vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
R
Rusty Russell 已提交
3017 3018 3019 3020
	if (!vmx->guest_msrs) {
		err = -ENOMEM;
		goto uninit_vcpu;
	}
3021

3022 3023
	vmx->host_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!vmx->host_msrs)
R
Rusty Russell 已提交
3024
		goto free_guest_msrs;
3025

3026 3027
	vmx->vmcs = alloc_vmcs();
	if (!vmx->vmcs)
R
Rusty Russell 已提交
3028
		goto free_msrs;
3029 3030 3031

	vmcs_clear(vmx->vmcs);

3032 3033
	cpu = get_cpu();
	vmx_vcpu_load(&vmx->vcpu, cpu);
R
Rusty Russell 已提交
3034
	err = vmx_vcpu_setup(vmx);
R
Rusty Russell 已提交
3035
	vmx_vcpu_put(&vmx->vcpu);
3036
	put_cpu();
R
Rusty Russell 已提交
3037 3038
	if (err)
		goto free_vmcs;
3039 3040 3041
	if (vm_need_virtualize_apic_accesses(kvm))
		if (alloc_apic_access_page(kvm) != 0)
			goto free_vmcs;
R
Rusty Russell 已提交
3042

3043 3044 3045 3046
	if (vm_need_ept())
		if (alloc_identity_pagetable(kvm) != 0)
			goto free_vmcs;

R
Rusty Russell 已提交
3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057
	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:
3058
	kmem_cache_free(kvm_vcpu_cache, vmx);
R
Rusty Russell 已提交
3059
	return ERR_PTR(err);
A
Avi Kivity 已提交
3060 3061
}

Y
Yang, Sheng 已提交
3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075
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;
	}
}

3076 3077 3078 3079 3080
static int get_ept_level(void)
{
	return VMX_EPT_DEFAULT_GAW + 1;
}

3081
static struct kvm_x86_ops vmx_x86_ops = {
A
Avi Kivity 已提交
3082 3083 3084 3085
	.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
3086
	.check_processor_compatibility = vmx_check_processor_compat,
A
Avi Kivity 已提交
3087 3088
	.hardware_enable = hardware_enable,
	.hardware_disable = hardware_disable,
3089
	.cpu_has_accelerated_tpr = cpu_has_vmx_virtualize_apic_accesses,
A
Avi Kivity 已提交
3090 3091 3092

	.vcpu_create = vmx_create_vcpu,
	.vcpu_free = vmx_free_vcpu,
3093
	.vcpu_reset = vmx_vcpu_reset,
A
Avi Kivity 已提交
3094

3095
	.prepare_guest_switch = vmx_save_host_state,
A
Avi Kivity 已提交
3096 3097
	.vcpu_load = vmx_vcpu_load,
	.vcpu_put = vmx_vcpu_put,
A
Avi Kivity 已提交
3098
	.vcpu_decache = vmx_vcpu_decache,
A
Avi Kivity 已提交
3099 3100

	.set_guest_debug = set_guest_debug,
3101
	.guest_debug_pre = kvm_guest_debug_pre,
A
Avi Kivity 已提交
3102 3103 3104 3105 3106
	.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,
3107
	.get_cpl = vmx_get_cpl,
A
Avi Kivity 已提交
3108
	.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
3109
	.decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
A
Avi Kivity 已提交
3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125
	.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,
	.cache_regs = vcpu_load_rsp_rip,
	.decache_regs = vcpu_put_rsp_rip,
	.get_rflags = vmx_get_rflags,
	.set_rflags = vmx_set_rflags,

	.tlb_flush = vmx_flush_tlb,

	.run = vmx_vcpu_run,
3126
	.handle_exit = kvm_handle_exit,
A
Avi Kivity 已提交
3127
	.skip_emulated_instruction = skip_emulated_instruction,
I
Ingo Molnar 已提交
3128
	.patch_hypercall = vmx_patch_hypercall,
E
Eddie Dong 已提交
3129 3130
	.get_irq = vmx_get_irq,
	.set_irq = vmx_inject_irq,
3131 3132
	.queue_exception = vmx_queue_exception,
	.exception_injected = vmx_exception_injected,
3133 3134
	.inject_pending_irq = vmx_intr_assist,
	.inject_pending_vectors = do_interrupt_requests,
3135 3136

	.set_tss_addr = vmx_set_tss_addr,
3137
	.get_tdp_level = get_ept_level,
A
Avi Kivity 已提交
3138 3139 3140 3141
};

static int __init vmx_init(void)
{
S
Sheng Yang 已提交
3142
	void *va;
3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154
	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
3155 3156 3157 3158 3159 3160
	vmx_msr_bitmap = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
	if (!vmx_msr_bitmap) {
		r = -ENOMEM;
		goto out1;
	}

3161 3162 3163 3164
	/*
	 * 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
3165 3166 3167
	va = kmap(vmx_io_bitmap_a);
	memset(va, 0xff, PAGE_SIZE);
	clear_bit(0x80, va);
3168
	kunmap(vmx_io_bitmap_a);
3169

S
Sheng Yang 已提交
3170 3171
	va = kmap(vmx_io_bitmap_b);
	memset(va, 0xff, PAGE_SIZE);
3172
	kunmap(vmx_io_bitmap_b);
3173

S
Sheng Yang 已提交
3174 3175 3176 3177
	va = kmap(vmx_msr_bitmap);
	memset(va, 0xff, PAGE_SIZE);
	kunmap(vmx_msr_bitmap);

3178 3179
	set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */

3180
	r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE);
3181
	if (r)
S
Sheng Yang 已提交
3182 3183 3184 3185 3186 3187 3188
		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);
3189

3190 3191 3192
	if (cpu_has_vmx_ept())
		bypass_guest_pf = 0;

3193 3194 3195
	if (bypass_guest_pf)
		kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);

3196 3197
	ept_sync_global();

3198 3199
	return 0;

S
Sheng Yang 已提交
3200 3201
out2:
	__free_page(vmx_msr_bitmap);
3202 3203 3204 3205 3206
out1:
	__free_page(vmx_io_bitmap_b);
out:
	__free_page(vmx_io_bitmap_a);
	return r;
A
Avi Kivity 已提交
3207 3208 3209 3210
}

static void __exit vmx_exit(void)
{
S
Sheng Yang 已提交
3211
	__free_page(vmx_msr_bitmap);
3212 3213 3214
	__free_page(vmx_io_bitmap_b);
	__free_page(vmx_io_bitmap_a);

3215
	kvm_exit();
A
Avi Kivity 已提交
3216 3217 3218 3219
}

module_init(vmx_init)
module_exit(vmx_exit)