vmx.c 108.0 KB
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/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * This module enables machines with Intel VT-x extensions to run virtual
 * machines without emulation or binary translation.
 *
 * Copyright (C) 2006 Qumranet, Inc.
 *
 * Authors:
 *   Avi Kivity   <avi@qumranet.com>
 *   Yaniv Kamay  <yaniv@qumranet.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

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#include "irq.h"
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#include "mmu.h"
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#include <linux/kvm_host.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
#include <linux/highmem.h>
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#include <linux/sched.h>
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#include <linux/moduleparam.h>
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#include <linux/ftrace_event.h>
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#include "kvm_cache_regs.h"
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#include "x86.h"
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#include <asm/io.h>
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#include <asm/desc.h>
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#include <asm/vmx.h>
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#include <asm/virtext.h>
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#include <asm/mce.h>
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#include "trace.h"

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#define __ex(x) __kvm_handle_fault_on_reboot(x)

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

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static int __read_mostly bypass_guest_pf = 1;
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module_param(bypass_guest_pf, bool, S_IRUGO);
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static int __read_mostly enable_vpid = 1;
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module_param_named(vpid, enable_vpid, bool, 0444);
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static int __read_mostly flexpriority_enabled = 1;
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module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
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static int __read_mostly enable_ept = 1;
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module_param_named(ept, enable_ept, bool, S_IRUGO);
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static int __read_mostly enable_unrestricted_guest = 1;
module_param_named(unrestricted_guest,
			enable_unrestricted_guest, bool, S_IRUGO);

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static int __read_mostly emulate_invalid_guest_state = 0;
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module_param(emulate_invalid_guest_state, bool, S_IRUGO);
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#define KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST				\
	(X86_CR0_WP | X86_CR0_NE | X86_CR0_NW | X86_CR0_CD)
#define KVM_GUEST_CR0_MASK						\
	(KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
#define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST				\
	(X86_CR0_WP | X86_CR0_NE | X86_CR0_TS | X86_CR0_MP)
#define KVM_VM_CR0_ALWAYS_ON						\
	(KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
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#define KVM_CR4_GUEST_OWNED_BITS				      \
	(X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR      \
	 | X86_CR4_OSXMMEXCPT)

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#define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
#define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)

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/*
 * These 2 parameters are used to config the controls for Pause-Loop Exiting:
 * ple_gap:    upper bound on the amount of time between two successive
 *             executions of PAUSE in a loop. Also indicate if ple enabled.
 *             According to test, this time is usually small than 41 cycles.
 * ple_window: upper bound on the amount of time a guest is allowed to execute
 *             in a PAUSE loop. Tests indicate that most spinlocks are held for
 *             less than 2^12 cycles
 * Time is measured based on a counter that runs at the same rate as the TSC,
 * refer SDM volume 3b section 21.6.13 & 22.1.3.
 */
#define KVM_VMX_DEFAULT_PLE_GAP    41
#define KVM_VMX_DEFAULT_PLE_WINDOW 4096
static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP;
module_param(ple_gap, int, S_IRUGO);

static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW;
module_param(ple_window, int, S_IRUGO);

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

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struct shared_msr_entry {
	unsigned index;
	u64 data;
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	u64 mask;
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};

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struct vcpu_vmx {
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	struct kvm_vcpu       vcpu;
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	struct list_head      local_vcpus_link;
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	unsigned long         host_rsp;
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	int                   launched;
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	u8                    fail;
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	u32                   idt_vectoring_info;
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	struct shared_msr_entry *guest_msrs;
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	int                   nmsrs;
	int                   save_nmsrs;
#ifdef CONFIG_X86_64
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	u64 		      msr_host_kernel_gs_base;
	u64 		      msr_guest_kernel_gs_base;
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#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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	} host_state;
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	struct {
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		int vm86_active;
		u8 save_iopl;
		struct kvm_save_segment {
			u16 selector;
			unsigned long base;
			u32 limit;
			u32 ar;
		} tr, es, ds, fs, gs;
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		struct {
			bool pending;
			u8 vector;
			unsigned rip;
		} irq;
	} rmode;
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	int vpid;
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	bool emulation_required;
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	/* Support for vnmi-less CPUs */
	int soft_vnmi_blocked;
	ktime_t entry_time;
	s64 vnmi_blocked_time;
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	u32 exit_reason;
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	bool rdtscp_enabled;
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};

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

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

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

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

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

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static u64 host_efer;

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static void ept_save_pdptrs(struct kvm_vcpu *vcpu);

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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,
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#endif
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	MSR_EFER, MSR_TSC_AUX, MSR_K6_STAR,
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};
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#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
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static inline int is_page_fault(u32 intr_info)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
			     INTR_INFO_VALID_MASK)) ==
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		(INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
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}

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

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

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

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

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

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

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

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

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

static inline bool cpu_has_vmx_flexpriority(void)
{
	return cpu_has_vmx_tpr_shadow() &&
		cpu_has_vmx_virtualize_apic_accesses();
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}

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static inline bool cpu_has_vmx_ept_execute_only(void)
{
	return !!(vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT);
}

static inline bool cpu_has_vmx_eptp_uncacheable(void)
{
	return !!(vmx_capability.ept & VMX_EPTP_UC_BIT);
}

static inline bool cpu_has_vmx_eptp_writeback(void)
{
	return !!(vmx_capability.ept & VMX_EPTP_WB_BIT);
}

static inline bool cpu_has_vmx_ept_2m_page(void)
{
	return !!(vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT);
}

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

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

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

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

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static inline int cpu_has_vmx_unrestricted_guest(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_UNRESTRICTED_GUEST;
}

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static inline int cpu_has_vmx_ple(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_PAUSE_LOOP_EXITING;
}

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

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

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static inline int cpu_has_vmx_rdtscp(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_RDTSCP;
}

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

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static inline bool report_flexpriority(void)
{
	return flexpriority_enabled;
}

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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)
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		if (vmx_msr_index[vmx->guest_msrs[i].index] == msr)
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			return i;
	return -1;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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	eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR);
578 579
	if (!vcpu->fpu_active)
		eb |= 1u << NM_VECTOR;
580 581 582 583 584
	/*
	 * Unconditionally intercept #DB so we can maintain dr6 without
	 * reading it every exit.
	 */
	eb |= 1u << DB_VECTOR;
J
Jan Kiszka 已提交
585 586 587 588
	if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
			eb |= 1u << BP_VECTOR;
	}
589
	if (to_vmx(vcpu)->rmode.vm86_active)
590
		eb = ~0;
591
	if (enable_ept)
592
		eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
593 594 595
	vmcs_write32(EXCEPTION_BITMAP, eb);
}

596 597 598 599 600 601
static void reload_tss(void)
{
	/*
	 * VT restores TR but not its size.  Useless.
	 */
	struct descriptor_table gdt;
602
	struct desc_struct *descs;
603

604
	kvm_get_gdt(&gdt);
605 606 607 608 609
	descs = (void *)gdt.base;
	descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
	load_TR_desc();
}

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610
static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
611
{
R
Roel Kluin 已提交
612
	u64 guest_efer;
613 614
	u64 ignore_bits;

615
	guest_efer = vmx->vcpu.arch.shadow_efer;
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Roel Kluin 已提交
616

617 618 619 620 621 622 623 624 625 626 627 628 629
	/*
	 * 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
	guest_efer &= ~ignore_bits;
	guest_efer |= host_efer & ignore_bits;
630
	vmx->guest_msrs[efer_offset].data = guest_efer;
631
	vmx->guest_msrs[efer_offset].mask = ~ignore_bits;
632
	return true;
633 634
}

635
static void vmx_save_host_state(struct kvm_vcpu *vcpu)
636
{
637
	struct vcpu_vmx *vmx = to_vmx(vcpu);
638
	int i;
639

640
	if (vmx->host_state.loaded)
641 642
		return;

643
	vmx->host_state.loaded = 1;
644 645 646 647
	/*
	 * Set host fs and gs selectors.  Unfortunately, 22.2.3 does not
	 * allow segment selectors with cpl > 0 or ti == 1.
	 */
648
	vmx->host_state.ldt_sel = kvm_read_ldt();
649
	vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
650
	vmx->host_state.fs_sel = kvm_read_fs();
651
	if (!(vmx->host_state.fs_sel & 7)) {
652
		vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
653 654
		vmx->host_state.fs_reload_needed = 0;
	} else {
655
		vmcs_write16(HOST_FS_SELECTOR, 0);
656
		vmx->host_state.fs_reload_needed = 1;
657
	}
658
	vmx->host_state.gs_sel = kvm_read_gs();
659 660
	if (!(vmx->host_state.gs_sel & 7))
		vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
661 662
	else {
		vmcs_write16(HOST_GS_SELECTOR, 0);
663
		vmx->host_state.gs_ldt_reload_needed = 1;
664 665 666 667 668 669
	}

#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
670 671
	vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
	vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
672
#endif
673 674

#ifdef CONFIG_X86_64
675 676 677 678
	if (is_long_mode(&vmx->vcpu)) {
		rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
		wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
	}
679
#endif
680 681
	for (i = 0; i < vmx->save_nmsrs; ++i)
		kvm_set_shared_msr(vmx->guest_msrs[i].index,
682 683
				   vmx->guest_msrs[i].data,
				   vmx->guest_msrs[i].mask);
684 685
}

686
static void __vmx_load_host_state(struct vcpu_vmx *vmx)
687
{
688
	unsigned long flags;
689

690
	if (!vmx->host_state.loaded)
691 692
		return;

693
	++vmx->vcpu.stat.host_state_reload;
694
	vmx->host_state.loaded = 0;
695
	if (vmx->host_state.fs_reload_needed)
696
		kvm_load_fs(vmx->host_state.fs_sel);
697
	if (vmx->host_state.gs_ldt_reload_needed) {
698
		kvm_load_ldt(vmx->host_state.ldt_sel);
699 700 701 702
		/*
		 * If we have to reload gs, we must take care to
		 * preserve our gs base.
		 */
703
		local_irq_save(flags);
704
		kvm_load_gs(vmx->host_state.gs_sel);
705 706 707
#ifdef CONFIG_X86_64
		wrmsrl(MSR_GS_BASE, vmcs_readl(HOST_GS_BASE));
#endif
708
		local_irq_restore(flags);
709
	}
710
	reload_tss();
711 712 713 714 715 716
#ifdef CONFIG_X86_64
	if (is_long_mode(&vmx->vcpu)) {
		rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
		wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
	}
#endif
717 718
}

719 720 721 722 723 724 725
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.
 */
730
static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
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731
{
732 733
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	u64 phys_addr = __pa(vmx->vmcs);
734
	u64 tsc_this, delta, new_offset;
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735

736
	if (vcpu->cpu != cpu) {
R
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737
		vcpu_clear(vmx);
M
Marcelo Tosatti 已提交
738
		kvm_migrate_timers(vcpu);
739
		set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests);
740 741 742 743
		local_irq_disable();
		list_add(&vmx->local_vcpus_link,
			 &per_cpu(vcpus_on_cpu, cpu));
		local_irq_enable();
744
	}
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745

746
	if (per_cpu(current_vmcs, cpu) != vmx->vmcs) {
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747 748
		u8 error;

749
		per_cpu(current_vmcs, cpu) = vmx->vmcs;
750
		asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
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751 752 753 754
			      : "=g"(error) : "a"(&phys_addr), "m"(phys_addr)
			      : "cc");
		if (error)
			printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
755
			       vmx->vmcs, phys_addr);
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756 757 758 759 760 761 762 763 764 765 766
	}

	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.
		 */
767 768
		vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
		kvm_get_gdt(&dt);
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769 770 771 772
		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 */
773 774 775 776 777

		/*
		 * Make sure the time stamp counter is monotonous.
		 */
		rdtscll(tsc_this);
778 779 780 781 782
		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)
{
788
	__vmx_load_host_state(to_vmx(vcpu));
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}

791 792 793 794 795
static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
{
	if (vcpu->fpu_active)
		return;
	vcpu->fpu_active = 1;
796
	vmcs_clear_bits(GUEST_CR0, X86_CR0_TS);
797
	if (vcpu->arch.cr0 & X86_CR0_TS)
798
		vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
799 800 801 802 803 804 805 806
	update_exception_bitmap(vcpu);
}

static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
{
	if (!vcpu->fpu_active)
		return;
	vcpu->fpu_active = 0;
807
	vmcs_set_bits(GUEST_CR0, X86_CR0_TS);
808 809 810
	update_exception_bitmap(vcpu);
}

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static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
{
813 814 815 816 817 818
	unsigned long rflags;

	rflags = vmcs_readl(GUEST_RFLAGS);
	if (to_vmx(vcpu)->rmode.vm86_active)
		rflags &= ~(unsigned long)(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
	return rflags;
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}

static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
823
	if (to_vmx(vcpu)->rmode.vm86_active)
824
		rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
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	vmcs_writel(GUEST_RFLAGS, rflags);
}

828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
{
	u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
	int ret = 0;

	if (interruptibility & GUEST_INTR_STATE_STI)
		ret |= X86_SHADOW_INT_STI;
	if (interruptibility & GUEST_INTR_STATE_MOV_SS)
		ret |= X86_SHADOW_INT_MOV_SS;

	return ret & mask;
}

static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
{
	u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
	u32 interruptibility = interruptibility_old;

	interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);

	if (mask & X86_SHADOW_INT_MOV_SS)
		interruptibility |= GUEST_INTR_STATE_MOV_SS;
	if (mask & X86_SHADOW_INT_STI)
		interruptibility |= GUEST_INTR_STATE_STI;

	if ((interruptibility != interruptibility_old))
		vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
}

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

861
	rip = kvm_rip_read(vcpu);
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	rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
863
	kvm_rip_write(vcpu, rip);
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864

865 866
	/* skipping an emulated instruction also counts */
	vmx_set_interrupt_shadow(vcpu, 0);
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867 868
}

869 870 871
static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
				bool has_error_code, u32 error_code)
{
872
	struct vcpu_vmx *vmx = to_vmx(vcpu);
873
	u32 intr_info = nr | INTR_INFO_VALID_MASK;
874

875
	if (has_error_code) {
876
		vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
877 878
		intr_info |= INTR_INFO_DELIVER_CODE_MASK;
	}
879

880
	if (vmx->rmode.vm86_active) {
881 882 883
		vmx->rmode.irq.pending = true;
		vmx->rmode.irq.vector = nr;
		vmx->rmode.irq.rip = kvm_rip_read(vcpu);
884 885 886
		if (kvm_exception_is_soft(nr))
			vmx->rmode.irq.rip +=
				vmx->vcpu.arch.event_exit_inst_len;
887 888
		intr_info |= INTR_TYPE_SOFT_INTR;
		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
889 890 891 892 893
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
		kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
		return;
	}

894 895 896
	if (kvm_exception_is_soft(nr)) {
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
			     vmx->vcpu.arch.event_exit_inst_len);
897 898 899 900 901
		intr_info |= INTR_TYPE_SOFT_EXCEPTION;
	} else
		intr_info |= INTR_TYPE_HARD_EXCEPTION;

	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
902 903
}

904 905 906 907 908
static bool vmx_rdtscp_supported(void)
{
	return cpu_has_vmx_rdtscp();
}

909 910 911
/*
 * Swap MSR entry in host/guest MSR entry array.
 */
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912
static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
913
{
914
	struct shared_msr_entry tmp;
915 916 917 918

	tmp = vmx->guest_msrs[to];
	vmx->guest_msrs[to] = vmx->guest_msrs[from];
	vmx->guest_msrs[from] = tmp;
919 920
}

921 922 923 924 925
/*
 * Set up the vmcs to automatically save and restore system
 * msrs.  Don't touch the 64-bit msrs if the guest is in legacy
 * mode, as fiddling with msrs is very expensive.
 */
R
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926
static void setup_msrs(struct vcpu_vmx *vmx)
927
{
928
	int save_nmsrs, index;
929
	unsigned long *msr_bitmap;
930

931
	vmx_load_host_state(vmx);
932 933
	save_nmsrs = 0;
#ifdef CONFIG_X86_64
R
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934 935
	if (is_long_mode(&vmx->vcpu)) {
		index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
936
		if (index >= 0)
R
Rusty Russell 已提交
937 938
			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_LSTAR);
939
		if (index >= 0)
R
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940 941
			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_CSTAR);
942
		if (index >= 0)
R
Rusty Russell 已提交
943
			move_msr_up(vmx, index, save_nmsrs++);
944 945 946
		index = __find_msr_index(vmx, MSR_TSC_AUX);
		if (index >= 0 && vmx->rdtscp_enabled)
			move_msr_up(vmx, index, save_nmsrs++);
947 948 949 950
		/*
		 * MSR_K6_STAR is only needed on long mode guests, and only
		 * if efer.sce is enabled.
		 */
R
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951
		index = __find_msr_index(vmx, MSR_K6_STAR);
952
		if ((index >= 0) && (vmx->vcpu.arch.shadow_efer & EFER_SCE))
R
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953
			move_msr_up(vmx, index, save_nmsrs++);
954 955
	}
#endif
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956 957
	index = __find_msr_index(vmx, MSR_EFER);
	if (index >= 0 && update_transition_efer(vmx, index))
958
		move_msr_up(vmx, index, save_nmsrs++);
959

960
	vmx->save_nmsrs = save_nmsrs;
961 962 963 964 965 966 967 968 969

	if (cpu_has_vmx_msr_bitmap()) {
		if (is_long_mode(&vmx->vcpu))
			msr_bitmap = vmx_msr_bitmap_longmode;
		else
			msr_bitmap = vmx_msr_bitmap_legacy;

		vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
	}
970 971
}

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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
 */
989
static void guest_write_tsc(u64 guest_tsc, u64 host_tsc)
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{
	vmcs_write64(TSC_OFFSET, guest_tsc - host_tsc);
}

/*
 * Reads an msr value (of 'msr_index') into 'pdata'.
 * Returns 0 on success, non-0 otherwise.
 * Assumes vcpu_load() was already called.
 */
static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
{
	u64 data;
1002
	struct shared_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) {
1010
#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;
1017 1018 1019 1020
	case MSR_KERNEL_GS_BASE:
		vmx_load_host_state(to_vmx(vcpu));
		data = to_vmx(vcpu)->msr_guest_kernel_gs_base;
		break;
1021
#endif
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1022
	case MSR_EFER:
1023
		return kvm_get_msr_common(vcpu, msr_index, pdata);
1024
	case MSR_IA32_TSC:
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		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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1031
		data = vmcs_readl(GUEST_SYSENTER_EIP);
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1032 1033
		break;
	case MSR_IA32_SYSENTER_ESP:
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1034
		data = vmcs_readl(GUEST_SYSENTER_ESP);
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1035
		break;
1036 1037 1038 1039
	case MSR_TSC_AUX:
		if (!to_vmx(vcpu)->rdtscp_enabled)
			return 1;
		/* Otherwise falls through */
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1040
	default:
1041
		vmx_load_host_state(to_vmx(vcpu));
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Rusty Russell 已提交
1042
		msr = find_msr_entry(to_vmx(vcpu), msr_index);
1043
		if (msr) {
1044
			vmx_load_host_state(to_vmx(vcpu));
1045 1046
			data = msr->data;
			break;
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		}
1048
		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)
{
1062
	struct vcpu_vmx *vmx = to_vmx(vcpu);
1063
	struct shared_msr_entry *msr;
1064
	u64 host_tsc;
1065 1066
	int ret = 0;

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1067
	switch (msr_index) {
1068
	case MSR_EFER:
1069
		vmx_load_host_state(vmx);
1070 1071
		ret = kvm_set_msr_common(vcpu, msr_index, data);
		break;
1072
#ifdef CONFIG_X86_64
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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;
1079 1080 1081 1082
	case MSR_KERNEL_GS_BASE:
		vmx_load_host_state(vmx);
		vmx->msr_guest_kernel_gs_base = data;
		break;
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1083 1084 1085 1086 1087
#endif
	case MSR_IA32_SYSENTER_CS:
		vmcs_write32(GUEST_SYSENTER_CS, data);
		break;
	case MSR_IA32_SYSENTER_EIP:
A
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1088
		vmcs_writel(GUEST_SYSENTER_EIP, data);
A
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1089 1090
		break;
	case MSR_IA32_SYSENTER_ESP:
A
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1091
		vmcs_writel(GUEST_SYSENTER_ESP, data);
A
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1092
		break;
1093
	case MSR_IA32_TSC:
1094 1095
		rdtscll(host_tsc);
		guest_write_tsc(data, host_tsc);
A
Avi Kivity 已提交
1096
		break;
S
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1097 1098 1099 1100 1101 1102
	case MSR_IA32_CR_PAT:
		if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
			vmcs_write64(GUEST_IA32_PAT, data);
			vcpu->arch.pat = data;
			break;
		}
1103 1104 1105 1106 1107 1108 1109 1110 1111
		ret = kvm_set_msr_common(vcpu, msr_index, data);
		break;
	case MSR_TSC_AUX:
		if (!vmx->rdtscp_enabled)
			return 1;
		/* Check reserved bit, higher 32 bits should be zero */
		if ((data >> 32) != 0)
			return 1;
		/* Otherwise falls through */
A
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1112
	default:
R
Rusty Russell 已提交
1113
		msr = find_msr_entry(vmx, msr_index);
1114
		if (msr) {
1115
			vmx_load_host_state(vmx);
1116 1117
			msr->data = data;
			break;
A
Avi Kivity 已提交
1118
		}
1119
		ret = kvm_set_msr_common(vcpu, msr_index, data);
A
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1120 1121
	}

1122
	return ret;
A
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1123 1124
}

1125
static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
A
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1126
{
1127 1128 1129 1130 1131 1132 1133 1134
	__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
	switch (reg) {
	case VCPU_REGS_RSP:
		vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
		break;
	case VCPU_REGS_RIP:
		vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
		break;
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1135 1136 1137 1138
	case VCPU_EXREG_PDPTR:
		if (enable_ept)
			ept_save_pdptrs(vcpu);
		break;
1139 1140 1141
	default:
		break;
	}
A
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1142 1143
}

1144
static void set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
A
Avi Kivity 已提交
1145
{
1146 1147 1148 1149 1150
	if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
		vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
	else
		vmcs_writel(GUEST_DR7, vcpu->arch.dr7);

1151
	update_exception_bitmap(vcpu);
A
Avi Kivity 已提交
1152 1153 1154 1155
}

static __init int cpu_has_kvm_support(void)
{
1156
	return cpu_has_vmx();
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1157 1158 1159 1160 1161 1162 1163
}

static __init int vmx_disabled_by_bios(void)
{
	u64 msr;

	rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
1164 1165 1166
	return (msr & (FEATURE_CONTROL_LOCKED |
		       FEATURE_CONTROL_VMXON_ENABLED))
	    == FEATURE_CONTROL_LOCKED;
1167
	/* locked but not enabled */
A
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1168 1169
}

1170
static int hardware_enable(void *garbage)
A
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1171 1172 1173 1174 1175
{
	int cpu = raw_smp_processor_id();
	u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
	u64 old;

1176 1177 1178
	if (read_cr4() & X86_CR4_VMXE)
		return -EBUSY;

1179
	INIT_LIST_HEAD(&per_cpu(vcpus_on_cpu, cpu));
A
Avi Kivity 已提交
1180
	rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
1181 1182 1183 1184
	if ((old & (FEATURE_CONTROL_LOCKED |
		    FEATURE_CONTROL_VMXON_ENABLED))
	    != (FEATURE_CONTROL_LOCKED |
		FEATURE_CONTROL_VMXON_ENABLED))
A
Avi Kivity 已提交
1185
		/* enable and lock */
1186
		wrmsrl(MSR_IA32_FEATURE_CONTROL, old |
1187 1188
		       FEATURE_CONTROL_LOCKED |
		       FEATURE_CONTROL_VMXON_ENABLED);
1189
	write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
1190 1191
	asm volatile (ASM_VMX_VMXON_RAX
		      : : "a"(&phys_addr), "m"(phys_addr)
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1192
		      : "memory", "cc");
1193 1194 1195 1196

	ept_sync_global();

	return 0;
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1197 1198
}

1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
static void vmclear_local_vcpus(void)
{
	int cpu = raw_smp_processor_id();
	struct vcpu_vmx *vmx, *n;

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

1209 1210 1211 1212 1213

/* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
 * tricks.
 */
static void kvm_cpu_vmxoff(void)
A
Avi Kivity 已提交
1214
{
1215
	asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
1216
	write_cr4(read_cr4() & ~X86_CR4_VMXE);
A
Avi Kivity 已提交
1217 1218
}

1219 1220 1221 1222 1223 1224
static void hardware_disable(void *garbage)
{
	vmclear_local_vcpus();
	kvm_cpu_vmxoff();
}

1225
static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
M
Mike Day 已提交
1226
				      u32 msr, u32 *result)
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
{
	u32 vmx_msr_low, vmx_msr_high;
	u32 ctl = ctl_min | ctl_opt;

	rdmsr(msr, vmx_msr_low, vmx_msr_high);

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

	/* Ensure minimum (required) set of control bits are supported. */
	if (ctl_min & ~ctl)
Y
Yang, Sheng 已提交
1238
		return -EIO;
1239 1240 1241 1242 1243

	*result = ctl;
	return 0;
}

Y
Yang, Sheng 已提交
1244
static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
A
Avi Kivity 已提交
1245 1246
{
	u32 vmx_msr_low, vmx_msr_high;
S
Sheng Yang 已提交
1247
	u32 min, opt, min2, opt2;
1248 1249
	u32 _pin_based_exec_control = 0;
	u32 _cpu_based_exec_control = 0;
1250
	u32 _cpu_based_2nd_exec_control = 0;
1251 1252 1253 1254
	u32 _vmexit_control = 0;
	u32 _vmentry_control = 0;

	min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
1255
	opt = PIN_BASED_VIRTUAL_NMIS;
1256 1257
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
				&_pin_based_exec_control) < 0)
Y
Yang, Sheng 已提交
1258
		return -EIO;
1259 1260 1261 1262 1263 1264

	min = CPU_BASED_HLT_EXITING |
#ifdef CONFIG_X86_64
	      CPU_BASED_CR8_LOAD_EXITING |
	      CPU_BASED_CR8_STORE_EXITING |
#endif
S
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1265 1266
	      CPU_BASED_CR3_LOAD_EXITING |
	      CPU_BASED_CR3_STORE_EXITING |
1267 1268
	      CPU_BASED_USE_IO_BITMAPS |
	      CPU_BASED_MOV_DR_EXITING |
M
Marcelo Tosatti 已提交
1269
	      CPU_BASED_USE_TSC_OFFSETING |
1270 1271
	      CPU_BASED_MWAIT_EXITING |
	      CPU_BASED_MONITOR_EXITING |
M
Marcelo Tosatti 已提交
1272
	      CPU_BASED_INVLPG_EXITING;
1273
	opt = CPU_BASED_TPR_SHADOW |
S
Sheng Yang 已提交
1274
	      CPU_BASED_USE_MSR_BITMAPS |
1275
	      CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1276 1277
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
				&_cpu_based_exec_control) < 0)
Y
Yang, Sheng 已提交
1278
		return -EIO;
1279 1280 1281 1282 1283
#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
1284
	if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
S
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		min2 = 0;
		opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
1287
			SECONDARY_EXEC_WBINVD_EXITING |
S
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1288
			SECONDARY_EXEC_ENABLE_VPID |
1289
			SECONDARY_EXEC_ENABLE_EPT |
1290
			SECONDARY_EXEC_UNRESTRICTED_GUEST |
1291 1292
			SECONDARY_EXEC_PAUSE_LOOP_EXITING |
			SECONDARY_EXEC_RDTSCP;
S
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1293 1294
		if (adjust_vmx_controls(min2, opt2,
					MSR_IA32_VMX_PROCBASED_CTLS2,
1295 1296 1297 1298 1299 1300 1301 1302
					&_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
S
Sheng Yang 已提交
1303
	if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
M
Marcelo Tosatti 已提交
1304 1305
		/* CR3 accesses and invlpg don't need to cause VM Exits when EPT
		   enabled */
1306 1307 1308
		_cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
					     CPU_BASED_CR3_STORE_EXITING |
					     CPU_BASED_INVLPG_EXITING);
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		rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
		      vmx_capability.ept, vmx_capability.vpid);
	}
1312 1313 1314 1315 1316

	min = 0;
#ifdef CONFIG_X86_64
	min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
#endif
S
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1317
	opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
1318 1319
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
				&_vmexit_control) < 0)
Y
Yang, Sheng 已提交
1320
		return -EIO;
1321

S
Sheng Yang 已提交
1322 1323
	min = 0;
	opt = VM_ENTRY_LOAD_IA32_PAT;
1324 1325
	if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
				&_vmentry_control) < 0)
Y
Yang, Sheng 已提交
1326
		return -EIO;
A
Avi Kivity 已提交
1327

N
Nguyen Anh Quynh 已提交
1328
	rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
1329 1330 1331

	/* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
	if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
Y
Yang, Sheng 已提交
1332
		return -EIO;
1333 1334 1335 1336

#ifdef CONFIG_X86_64
	/* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
	if (vmx_msr_high & (1u<<16))
Y
Yang, Sheng 已提交
1337
		return -EIO;
1338 1339 1340 1341
#endif

	/* Require Write-Back (WB) memory type for VMCS accesses. */
	if (((vmx_msr_high >> 18) & 15) != 6)
Y
Yang, Sheng 已提交
1342
		return -EIO;
1343

Y
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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;
1347

Y
Yang, Sheng 已提交
1348 1349
	vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
	vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
1350
	vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
Y
Yang, Sheng 已提交
1351 1352
	vmcs_conf->vmexit_ctrl         = _vmexit_control;
	vmcs_conf->vmentry_ctrl        = _vmentry_control;
1353 1354

	return 0;
N
Nguyen Anh Quynh 已提交
1355
}
A
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1356 1357 1358 1359 1360 1361 1362

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

1363
	pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order);
A
Avi Kivity 已提交
1364 1365 1366
	if (!pages)
		return NULL;
	vmcs = page_address(pages);
1367 1368
	memset(vmcs, 0, vmcs_config.size);
	vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
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1369 1370 1371 1372 1373
	return vmcs;
}

static struct vmcs *alloc_vmcs(void)
{
1374
	return alloc_vmcs_cpu(raw_smp_processor_id());
A
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1375 1376 1377 1378
}

static void free_vmcs(struct vmcs *vmcs)
{
1379
	free_pages((unsigned long)vmcs, vmcs_config.order);
A
Avi Kivity 已提交
1380 1381
}

1382
static void free_kvm_area(void)
A
Avi Kivity 已提交
1383 1384 1385
{
	int cpu;

Z
Zachary Amsden 已提交
1386
	for_each_possible_cpu(cpu) {
A
Avi Kivity 已提交
1387
		free_vmcs(per_cpu(vmxarea, cpu));
Z
Zachary Amsden 已提交
1388 1389
		per_cpu(vmxarea, cpu) = NULL;
	}
A
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1390 1391 1392 1393 1394 1395
}

static __init int alloc_kvm_area(void)
{
	int cpu;

Z
Zachary Amsden 已提交
1396
	for_each_possible_cpu(cpu) {
A
Avi Kivity 已提交
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411
		struct vmcs *vmcs;

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

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

static __init int hardware_setup(void)
{
Y
Yang, Sheng 已提交
1412 1413
	if (setup_vmcs_config(&vmcs_config) < 0)
		return -EIO;
1414 1415 1416 1417

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

S
Sheng Yang 已提交
1418 1419 1420
	if (!cpu_has_vmx_vpid())
		enable_vpid = 0;

1421
	if (!cpu_has_vmx_ept()) {
S
Sheng Yang 已提交
1422
		enable_ept = 0;
1423 1424 1425 1426 1427
		enable_unrestricted_guest = 0;
	}

	if (!cpu_has_vmx_unrestricted_guest())
		enable_unrestricted_guest = 0;
S
Sheng Yang 已提交
1428 1429 1430 1431

	if (!cpu_has_vmx_flexpriority())
		flexpriority_enabled = 0;

1432 1433 1434
	if (!cpu_has_vmx_tpr_shadow())
		kvm_x86_ops->update_cr8_intercept = NULL;

1435 1436 1437
	if (enable_ept && !cpu_has_vmx_ept_2m_page())
		kvm_disable_largepages();

1438 1439 1440
	if (!cpu_has_vmx_ple())
		ple_gap = 0;

A
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1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
	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];

1453
	if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
A
Avi Kivity 已提交
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467
		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;
1468
	struct vcpu_vmx *vmx = to_vmx(vcpu);
A
Avi Kivity 已提交
1469

1470
	vmx->emulation_required = 1;
1471
	vmx->rmode.vm86_active = 0;
A
Avi Kivity 已提交
1472

1473 1474 1475
	vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base);
	vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit);
	vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar);
A
Avi Kivity 已提交
1476 1477

	flags = vmcs_readl(GUEST_RFLAGS);
1478
	flags &= ~(X86_EFLAGS_IOPL | X86_EFLAGS_VM);
1479
	flags |= (vmx->rmode.save_iopl << IOPL_SHIFT);
A
Avi Kivity 已提交
1480 1481
	vmcs_writel(GUEST_RFLAGS, flags);

1482 1483
	vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
			(vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
A
Avi Kivity 已提交
1484 1485 1486

	update_exception_bitmap(vcpu);

1487 1488 1489
	if (emulate_invalid_guest_state)
		return;

1490 1491 1492 1493
	fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es);
	fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds);
	fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs);
	fix_pmode_dataseg(VCPU_SREG_FS, &vmx->rmode.fs);
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1494 1495 1496 1497 1498 1499 1500 1501 1502

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

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

M
Mike Day 已提交
1503
static gva_t rmode_tss_base(struct kvm *kvm)
A
Avi Kivity 已提交
1504
{
1505
	if (!kvm->arch.tss_addr) {
1506 1507 1508 1509 1510
		struct kvm_memslots *slots;
		gfn_t base_gfn;

		slots = rcu_dereference(kvm->memslots);
		base_gfn = kvm->memslots->memslots[0].base_gfn +
1511
				 kvm->memslots->memslots[0].npages - 3;
1512 1513
		return base_gfn << PAGE_SHIFT;
	}
1514
	return kvm->arch.tss_addr;
A
Avi Kivity 已提交
1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
}

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);
1525 1526
	vmcs_write16(sf->selector, save->base >> 4);
	vmcs_write32(sf->base, save->base & 0xfffff);
A
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1527 1528 1529 1530 1531 1532 1533
	vmcs_write32(sf->limit, 0xffff);
	vmcs_write32(sf->ar_bytes, 0xf3);
}

static void enter_rmode(struct kvm_vcpu *vcpu)
{
	unsigned long flags;
1534
	struct vcpu_vmx *vmx = to_vmx(vcpu);
A
Avi Kivity 已提交
1535

1536 1537 1538
	if (enable_unrestricted_guest)
		return;

1539
	vmx->emulation_required = 1;
1540
	vmx->rmode.vm86_active = 1;
A
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1541

1542
	vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
A
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1543 1544
	vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));

1545
	vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
A
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1546 1547
	vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);

1548
	vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
A
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1549 1550 1551
	vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);

	flags = vmcs_readl(GUEST_RFLAGS);
1552
	vmx->rmode.save_iopl
1553
		= (flags & X86_EFLAGS_IOPL) >> IOPL_SHIFT;
A
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1554

1555
	flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
A
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1556 1557

	vmcs_writel(GUEST_RFLAGS, flags);
1558
	vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
A
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1559 1560
	update_exception_bitmap(vcpu);

1561 1562 1563
	if (emulate_invalid_guest_state)
		goto continue_rmode;

A
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1564 1565 1566 1567 1568
	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);
1569
	vmcs_write32(GUEST_CS_LIMIT, 0xffff);
1570 1571
	if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
		vmcs_writel(GUEST_CS_BASE, 0xf0000);
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1572 1573
	vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);

1574 1575 1576 1577
	fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es);
	fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds);
	fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs);
	fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs);
1578

1579
continue_rmode:
1580
	kvm_mmu_reset_context(vcpu);
1581
	init_rmode(vcpu->kvm);
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1582 1583
}

1584 1585 1586
static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);
1587 1588 1589 1590
	struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);

	if (!msr)
		return;
1591

1592 1593 1594 1595 1596
	/*
	 * Force kernel_gs_base reloading before EFER changes, as control
	 * of this msr depends on is_long_mode().
	 */
	vmx_load_host_state(to_vmx(vcpu));
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
	vcpu->arch.shadow_efer = efer;
	if (!msr)
		return;
	if (efer & EFER_LMA) {
		vmcs_write32(VM_ENTRY_CONTROLS,
			     vmcs_read32(VM_ENTRY_CONTROLS) |
			     VM_ENTRY_IA32E_MODE);
		msr->data = efer;
	} else {
		vmcs_write32(VM_ENTRY_CONTROLS,
			     vmcs_read32(VM_ENTRY_CONTROLS) &
			     ~VM_ENTRY_IA32E_MODE);

		msr->data = efer & ~EFER_LME;
	}
	setup_msrs(vmx);
}

1615
#ifdef CONFIG_X86_64
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1616 1617 1618 1619 1620 1621 1622 1623

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",
1624
		       __func__);
A
Avi Kivity 已提交
1625 1626 1627 1628
		vmcs_write32(GUEST_TR_AR_BYTES,
			     (guest_tr_ar & ~AR_TYPE_MASK)
			     | AR_TYPE_BUSY_64_TSS);
	}
1629
	vcpu->arch.shadow_efer |= EFER_LMA;
1630
	vmx_set_efer(vcpu, vcpu->arch.shadow_efer);
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1631 1632 1633 1634
}

static void exit_lmode(struct kvm_vcpu *vcpu)
{
1635
	vcpu->arch.shadow_efer &= ~EFER_LMA;
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1636 1637 1638

	vmcs_write32(VM_ENTRY_CONTROLS,
		     vmcs_read32(VM_ENTRY_CONTROLS)
1639
		     & ~VM_ENTRY_IA32E_MODE);
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1640 1641 1642 1643
}

#endif

1644 1645 1646
static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
{
	vpid_sync_vcpu_all(to_vmx(vcpu));
1647
	if (enable_ept)
1648
		ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
1649 1650
}

1651
static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
1652
{
1653 1654 1655 1656
	ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits;

	vcpu->arch.cr4 &= ~cr4_guest_owned_bits;
	vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits;
1657 1658
}

1659 1660
static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
{
A
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1661 1662 1663 1664
	if (!test_bit(VCPU_EXREG_PDPTR,
		      (unsigned long *)&vcpu->arch.regs_dirty))
		return;

1665 1666 1667 1668 1669 1670 1671 1672
	if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
		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]);
	}
}

1673 1674 1675 1676 1677 1678 1679 1680
static void ept_save_pdptrs(struct kvm_vcpu *vcpu)
{
	if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
		vcpu->arch.pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
		vcpu->arch.pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
		vcpu->arch.pdptrs[2] = vmcs_read64(GUEST_PDPTR2);
		vcpu->arch.pdptrs[3] = vmcs_read64(GUEST_PDPTR3);
	}
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1681 1682 1683 1684 1685

	__set_bit(VCPU_EXREG_PDPTR,
		  (unsigned long *)&vcpu->arch.regs_avail);
	__set_bit(VCPU_EXREG_PDPTR,
		  (unsigned long *)&vcpu->arch.regs_dirty);
1686 1687
}

1688 1689 1690 1691 1692 1693 1694 1695 1696
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,
1697
			     vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
1698 1699 1700
			     (CPU_BASED_CR3_LOAD_EXITING |
			      CPU_BASED_CR3_STORE_EXITING));
		vcpu->arch.cr0 = cr0;
1701
		vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
1702 1703 1704
	} else if (!is_paging(vcpu)) {
		/* From nonpaging to paging */
		vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
1705
			     vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
1706 1707 1708
			     ~(CPU_BASED_CR3_LOAD_EXITING |
			       CPU_BASED_CR3_STORE_EXITING));
		vcpu->arch.cr0 = cr0;
1709
		vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
1710
	}
1711 1712 1713

	if (!(cr0 & X86_CR0_WP))
		*hw_cr0 &= ~X86_CR0_WP;
1714 1715
}

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1716 1717
static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
1718
	struct vcpu_vmx *vmx = to_vmx(vcpu);
1719 1720 1721 1722 1723 1724 1725
	unsigned long hw_cr0;

	if (enable_unrestricted_guest)
		hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST)
			| KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST;
	else
		hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON;
1726

1727 1728
	vmx_fpu_deactivate(vcpu);

1729
	if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE))
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1730 1731
		enter_pmode(vcpu);

1732
	if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE))
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1733 1734
		enter_rmode(vcpu);

1735
#ifdef CONFIG_X86_64
1736
	if (vcpu->arch.shadow_efer & EFER_LME) {
1737
		if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
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1738
			enter_lmode(vcpu);
1739
		if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
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1740 1741 1742 1743
			exit_lmode(vcpu);
	}
#endif

1744
	if (enable_ept)
1745 1746
		ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);

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1747
	vmcs_writel(CR0_READ_SHADOW, cr0);
1748
	vmcs_writel(GUEST_CR0, hw_cr0);
1749
	vcpu->arch.cr0 = cr0;
1750

1751
	if (!(cr0 & X86_CR0_TS) || !(cr0 & X86_CR0_PE))
1752
		vmx_fpu_activate(vcpu);
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1753 1754
}

1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766
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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1767 1768
static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
1769 1770 1771 1772
	unsigned long guest_cr3;
	u64 eptp;

	guest_cr3 = cr3;
1773
	if (enable_ept) {
1774 1775 1776
		eptp = construct_eptp(cr3);
		vmcs_write64(EPT_POINTER, eptp);
		guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
1777
			vcpu->kvm->arch.ept_identity_map_addr;
1778
		ept_load_pdptrs(vcpu);
1779 1780
	}

1781
	vmx_flush_tlb(vcpu);
1782
	vmcs_writel(GUEST_CR3, guest_cr3);
1783
	if (vcpu->arch.cr0 & X86_CR0_PE)
1784
		vmx_fpu_deactivate(vcpu);
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1785 1786 1787 1788
}

static void vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
1789
	unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ?
1790 1791
		    KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);

1792
	vcpu->arch.cr4 = cr4;
1793 1794 1795 1796 1797 1798 1799 1800
	if (enable_ept) {
		if (!is_paging(vcpu)) {
			hw_cr4 &= ~X86_CR4_PAE;
			hw_cr4 |= X86_CR4_PSE;
		} else if (!(cr4 & X86_CR4_PAE)) {
			hw_cr4 &= ~X86_CR4_PAE;
		}
	}
1801 1802 1803

	vmcs_writel(CR4_READ_SHADOW, cr4);
	vmcs_writel(GUEST_CR4, hw_cr4);
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1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822
}

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);
1823
	if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
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1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835
		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;
}

1836 1837 1838 1839 1840 1841 1842 1843
static int vmx_get_cpl(struct kvm_vcpu *vcpu)
{
	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;

A
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1844
	return vmcs_read16(GUEST_CS_SELECTOR) & 3;
1845 1846
}

1847
static u32 vmx_segment_access_rights(struct kvm_segment *var)
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1848 1849 1850
{
	u32 ar;

1851
	if (var->unusable)
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1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862
		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;
	}
1863 1864
	if (ar == 0) /* a 0 value means unusable */
		ar = AR_UNUSABLE_MASK;
1865 1866 1867 1868 1869 1870 1871

	return ar;
}

static void vmx_set_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
1872
	struct vcpu_vmx *vmx = to_vmx(vcpu);
1873 1874 1875
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
	u32 ar;

1876 1877 1878 1879 1880
	if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) {
		vmx->rmode.tr.selector = var->selector;
		vmx->rmode.tr.base = var->base;
		vmx->rmode.tr.limit = var->limit;
		vmx->rmode.tr.ar = vmx_segment_access_rights(var);
1881 1882 1883 1884 1885
		return;
	}
	vmcs_writel(sf->base, var->base);
	vmcs_write32(sf->limit, var->limit);
	vmcs_write16(sf->selector, var->selector);
1886
	if (vmx->rmode.vm86_active && var->s) {
1887 1888 1889 1890 1891 1892 1893 1894
		/*
		 * 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);
1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909

	/*
	 *   Fix the "Accessed" bit in AR field of segment registers for older
	 * qemu binaries.
	 *   IA32 arch specifies that at the time of processor reset the
	 * "Accessed" bit in the AR field of segment registers is 1. And qemu
	 * is setting it to 0 in the usedland code. This causes invalid guest
	 * state vmexit when "unrestricted guest" mode is turned on.
	 *    Fix for this setup issue in cpu_reset is being pushed in the qemu
	 * tree. Newer qemu binaries with that qemu fix would not need this
	 * kvm hack.
	 */
	if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR))
		ar |= 0x1; /* Accessed */

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1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944
	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);
}

1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
{
	struct kvm_segment var;
	u32 ar;

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

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

	return true;
}

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

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

1971 1972
	if (cs.unusable)
		return false;
1973 1974 1975 1976
	if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
		return false;
	if (!cs.s)
		return false;
1977
	if (cs.type & AR_TYPE_WRITEABLE_MASK) {
1978 1979
		if (cs.dpl > cs_rpl)
			return false;
1980
	} else {
1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998
		if (cs.dpl != cs_rpl)
			return false;
	}
	if (!cs.present)
		return false;

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

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

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

1999 2000 2001
	if (ss.unusable)
		return true;
	if (ss.type != 3 && ss.type != 7)
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
		return false;
	if (!ss.s)
		return false;
	if (ss.dpl != ss_rpl) /* DPL != RPL */
		return false;
	if (!ss.present)
		return false;

	return true;
}

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

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

2021 2022
	if (var.unusable)
		return true;
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043
	if (!var.s)
		return false;
	if (!var.present)
		return false;
	if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
		if (var.dpl < rpl) /* DPL < RPL */
			return false;
	}

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

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

	vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);

2044 2045
	if (tr.unusable)
		return false;
2046 2047
	if (tr.selector & SELECTOR_TI_MASK)	/* TI = 1 */
		return false;
2048
	if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061
		return false;
	if (!tr.present)
		return false;

	return true;
}

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

	vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);

2062 2063
	if (ldtr.unusable)
		return true;
2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
	if (ldtr.selector & SELECTOR_TI_MASK)	/* TI = 1 */
		return false;
	if (ldtr.type != 2)
		return false;
	if (!ldtr.present)
		return false;

	return true;
}

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

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

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

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

	return true;
}

M
Mike Day 已提交
2135
static int init_rmode_tss(struct kvm *kvm)
A
Avi Kivity 已提交
2136 2137
{
	gfn_t fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
2138
	u16 data = 0;
2139
	int ret = 0;
2140
	int r;
A
Avi Kivity 已提交
2141

2142 2143
	r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
	if (r < 0)
2144
		goto out;
2145
	data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
2146 2147
	r = kvm_write_guest_page(kvm, fn++, &data,
			TSS_IOPB_BASE_OFFSET, sizeof(u16));
2148
	if (r < 0)
2149
		goto out;
2150 2151
	r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
	if (r < 0)
2152
		goto out;
2153 2154
	r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
	if (r < 0)
2155
		goto out;
2156
	data = ~0;
2157 2158 2159
	r = kvm_write_guest_page(kvm, fn, &data,
				 RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
				 sizeof(u8));
2160
	if (r < 0)
2161 2162 2163 2164 2165
		goto out;

	ret = 1;
out:
	return ret;
A
Avi Kivity 已提交
2166 2167
}

2168 2169 2170 2171 2172 2173
static int init_rmode_identity_map(struct kvm *kvm)
{
	int i, r, ret;
	pfn_t identity_map_pfn;
	u32 tmp;

2174
	if (!enable_ept)
2175 2176 2177 2178 2179 2180 2181 2182 2183
		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;
2184
	identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT;
2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202
	r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
	if (r < 0)
		goto out;
	/* Set up identity-mapping pagetable for EPT in real mode */
	for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
		tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
			_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
		r = kvm_write_guest_page(kvm, identity_map_pfn,
				&tmp, i * sizeof(tmp), sizeof(tmp));
		if (r < 0)
			goto out;
	}
	kvm->arch.ept_identity_pagetable_done = true;
	ret = 1;
out:
	return ret;
}

A
Avi Kivity 已提交
2203 2204 2205
static void seg_setup(int seg)
{
	struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2206
	unsigned int ar;
A
Avi Kivity 已提交
2207 2208 2209 2210

	vmcs_write16(sf->selector, 0);
	vmcs_writel(sf->base, 0);
	vmcs_write32(sf->limit, 0xffff);
2211 2212 2213 2214 2215 2216 2217 2218
	if (enable_unrestricted_guest) {
		ar = 0x93;
		if (seg == VCPU_SREG_CS)
			ar |= 0x08; /* code segment */
	} else
		ar = 0xf3;

	vmcs_write32(sf->ar_bytes, ar);
A
Avi Kivity 已提交
2219 2220
}

2221 2222 2223 2224 2225
static int alloc_apic_access_page(struct kvm *kvm)
{
	struct kvm_userspace_memory_region kvm_userspace_mem;
	int r = 0;

2226
	mutex_lock(&kvm->slots_lock);
2227
	if (kvm->arch.apic_access_page)
2228 2229 2230 2231 2232 2233 2234 2235
		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;
2236

2237
	kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
2238
out:
2239
	mutex_unlock(&kvm->slots_lock);
2240 2241 2242
	return r;
}

2243 2244 2245 2246 2247
static int alloc_identity_pagetable(struct kvm *kvm)
{
	struct kvm_userspace_memory_region kvm_userspace_mem;
	int r = 0;

2248
	mutex_lock(&kvm->slots_lock);
2249 2250 2251 2252
	if (kvm->arch.ept_identity_pagetable)
		goto out;
	kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
	kvm_userspace_mem.flags = 0;
2253 2254
	kvm_userspace_mem.guest_phys_addr =
		kvm->arch.ept_identity_map_addr;
2255 2256 2257 2258 2259 2260
	kvm_userspace_mem.memory_size = PAGE_SIZE;
	r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
	if (r)
		goto out;

	kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
2261
			kvm->arch.ept_identity_map_addr >> PAGE_SHIFT);
2262
out:
2263
	mutex_unlock(&kvm->slots_lock);
2264 2265 2266
	return r;
}

2267 2268 2269 2270 2271
static void allocate_vpid(struct vcpu_vmx *vmx)
{
	int vpid;

	vmx->vpid = 0;
2272
	if (!enable_vpid)
2273 2274 2275 2276 2277 2278 2279 2280 2281 2282
		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);
}

2283
static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr)
S
Sheng Yang 已提交
2284
{
2285
	int f = sizeof(unsigned long);
S
Sheng Yang 已提交
2286 2287 2288 2289 2290 2291 2292 2293 2294 2295

	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.
	 */
	if (msr <= 0x1fff) {
2296 2297
		__clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */
		__clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */
S
Sheng Yang 已提交
2298 2299
	} else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
		msr &= 0x1fff;
2300 2301
		__clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */
		__clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */
S
Sheng Yang 已提交
2302 2303 2304
	}
}

2305 2306 2307 2308 2309 2310 2311
static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
{
	if (!longmode_only)
		__vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr);
	__vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr);
}

A
Avi Kivity 已提交
2312 2313 2314
/*
 * Sets up the vmcs for emulated real mode.
 */
R
Rusty Russell 已提交
2315
static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
A
Avi Kivity 已提交
2316
{
S
Sheng Yang 已提交
2317
	u32 host_sysenter_cs, msr_low, msr_high;
A
Avi Kivity 已提交
2318
	u32 junk;
2319
	u64 host_pat, tsc_this, tsc_base;
A
Avi Kivity 已提交
2320 2321 2322
	unsigned long a;
	struct descriptor_table dt;
	int i;
2323
	unsigned long kvm_vmx_return;
2324
	u32 exec_control;
A
Avi Kivity 已提交
2325 2326

	/* I/O */
2327 2328
	vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
	vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b));
A
Avi Kivity 已提交
2329

S
Sheng Yang 已提交
2330
	if (cpu_has_vmx_msr_bitmap())
2331
		vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy));
S
Sheng Yang 已提交
2332

A
Avi Kivity 已提交
2333 2334 2335
	vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */

	/* Control */
2336 2337
	vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
		vmcs_config.pin_based_exec_ctrl);
2338 2339 2340 2341 2342 2343 2344 2345 2346

	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
	}
2347
	if (!enable_ept)
S
Sheng Yang 已提交
2348
		exec_control |= CPU_BASED_CR3_STORE_EXITING |
2349 2350
				CPU_BASED_CR3_LOAD_EXITING  |
				CPU_BASED_INVLPG_EXITING;
2351
	vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
A
Avi Kivity 已提交
2352

2353 2354 2355 2356 2357
	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;
2358 2359
		if (vmx->vpid == 0)
			exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
2360
		if (!enable_ept) {
S
Sheng Yang 已提交
2361
			exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
2362 2363
			enable_unrestricted_guest = 0;
		}
2364 2365
		if (!enable_unrestricted_guest)
			exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
2366 2367
		if (!ple_gap)
			exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING;
2368 2369
		vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
	}
2370

2371 2372 2373 2374 2375
	if (ple_gap) {
		vmcs_write32(PLE_GAP, ple_gap);
		vmcs_write32(PLE_WINDOW, ple_window);
	}

2376 2377
	vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
	vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
A
Avi Kivity 已提交
2378 2379 2380 2381 2382 2383 2384 2385 2386
	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 */
2387 2388
	vmcs_write16(HOST_FS_SELECTOR, kvm_read_fs());    /* 22.2.4 */
	vmcs_write16(HOST_GS_SELECTOR, kvm_read_gs());    /* 22.2.4 */
A
Avi Kivity 已提交
2389
	vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
2390
#ifdef CONFIG_X86_64
A
Avi Kivity 已提交
2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401
	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 */

2402
	kvm_get_idt(&dt);
A
Avi Kivity 已提交
2403 2404
	vmcs_writel(HOST_IDTR_BASE, dt.base);   /* 22.2.4 */

M
Mike Day 已提交
2405
	asm("mov $.Lkvm_vmx_return, %0" : "=r"(kvm_vmx_return));
2406
	vmcs_writel(HOST_RIP, kvm_vmx_return); /* 22.2.5 */
2407 2408 2409
	vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
	vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
A
Avi Kivity 已提交
2410 2411 2412 2413 2414 2415 2416 2417

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

S
Sheng Yang 已提交
2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431
	if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
		rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
		host_pat = msr_low | ((u64) msr_high << 32);
		vmcs_write64(HOST_IA32_PAT, host_pat);
	}
	if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
		rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
		host_pat = msr_low | ((u64) msr_high << 32);
		/* Write the default value follow host pat */
		vmcs_write64(GUEST_IA32_PAT, host_pat);
		/* Keep arch.pat sync with GUEST_IA32_PAT */
		vmx->vcpu.arch.pat = host_pat;
	}

A
Avi Kivity 已提交
2432 2433 2434
	for (i = 0; i < NR_VMX_MSR; ++i) {
		u32 index = vmx_msr_index[i];
		u32 data_low, data_high;
2435
		int j = vmx->nmsrs;
A
Avi Kivity 已提交
2436 2437 2438

		if (rdmsr_safe(index, &data_low, &data_high) < 0)
			continue;
2439 2440
		if (wrmsr_safe(index, data_low, data_high) < 0)
			continue;
2441 2442
		vmx->guest_msrs[j].index = i;
		vmx->guest_msrs[j].data = 0;
2443
		vmx->guest_msrs[j].mask = -1ull;
2444
		++vmx->nmsrs;
A
Avi Kivity 已提交
2445 2446
	}

2447
	vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
A
Avi Kivity 已提交
2448 2449

	/* 22.2.1, 20.8.1 */
2450 2451
	vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);

2452
	vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
2453
	vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS;
2454 2455
	if (enable_ept)
		vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE;
2456
	vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits);
2457

2458 2459 2460 2461 2462 2463
	tsc_base = vmx->vcpu.kvm->arch.vm_init_tsc;
	rdtscll(tsc_this);
	if (tsc_this < vmx->vcpu.kvm->arch.vm_init_tsc)
		tsc_base = tsc_this;

	guest_write_tsc(0, tsc_base);
2464

2465 2466 2467
	return 0;
}

2468 2469 2470 2471 2472 2473 2474 2475 2476
static int init_rmode(struct kvm *kvm)
{
	if (!init_rmode_tss(kvm))
		return 0;
	if (!init_rmode_identity_map(kvm))
		return 0;
	return 1;
}

2477 2478 2479 2480
static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	u64 msr;
2481
	int ret, idx;
2482

2483
	vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
2484
	idx = srcu_read_lock(&vcpu->kvm->srcu);
2485
	if (!init_rmode(vmx->vcpu.kvm)) {
2486 2487 2488 2489
		ret = -ENOMEM;
		goto out;
	}

2490
	vmx->rmode.vm86_active = 0;
2491

2492 2493
	vmx->soft_vnmi_blocked = 0;

2494
	vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
2495
	kvm_set_cr8(&vmx->vcpu, 0);
2496
	msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
2497
	if (kvm_vcpu_is_bsp(&vmx->vcpu))
2498 2499 2500 2501 2502
		msr |= MSR_IA32_APICBASE_BSP;
	kvm_set_apic_base(&vmx->vcpu, msr);

	fx_init(&vmx->vcpu);

2503
	seg_setup(VCPU_SREG_CS);
2504 2505 2506 2507
	/*
	 * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
	 * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4.  Sigh.
	 */
2508
	if (kvm_vcpu_is_bsp(&vmx->vcpu)) {
2509 2510 2511
		vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
		vmcs_writel(GUEST_CS_BASE, 0x000f0000);
	} else {
2512 2513
		vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
		vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536
	}

	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);
2537
	if (kvm_vcpu_is_bsp(&vmx->vcpu))
2538
		kvm_rip_write(vcpu, 0xfff0);
2539
	else
2540 2541
		kvm_rip_write(vcpu, 0);
	kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559

	vmcs_writel(GUEST_DR7, 0x400);

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

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

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

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

	setup_msrs(vmx);

A
Avi Kivity 已提交
2560 2561
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */

2562 2563 2564 2565
	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,
2566
				page_to_phys(vmx->vcpu.arch.apic->regs_page));
2567 2568 2569 2570 2571
		vmcs_write32(TPR_THRESHOLD, 0);
	}

	if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
		vmcs_write64(APIC_ACCESS_ADDR,
2572
			     page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
A
Avi Kivity 已提交
2573

2574 2575 2576
	if (vmx->vpid != 0)
		vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);

2577
	vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
2578
	vmx_set_cr0(&vmx->vcpu, vmx->vcpu.arch.cr0); /* enter rmode */
R
Rusty Russell 已提交
2579 2580 2581 2582
	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
2583

2584 2585
	vpid_sync_vcpu_all(vmx);

2586
	ret = 0;
A
Avi Kivity 已提交
2587

2588 2589 2590
	/* HACK: Don't enable emulation on guest boot/reset */
	vmx->emulation_required = 0;

A
Avi Kivity 已提交
2591
out:
2592
	srcu_read_unlock(&vcpu->kvm->srcu, idx);
A
Avi Kivity 已提交
2593 2594 2595
	return ret;
}

2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618
static void enable_irq_window(struct kvm_vcpu *vcpu)
{
	u32 cpu_based_vm_exec_control;

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

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

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

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

2619
static void vmx_inject_irq(struct kvm_vcpu *vcpu)
2620
{
2621
	struct vcpu_vmx *vmx = to_vmx(vcpu);
2622 2623
	uint32_t intr;
	int irq = vcpu->arch.interrupt.nr;
2624

2625
	trace_kvm_inj_virq(irq);
F
Feng (Eric) Liu 已提交
2626

2627
	++vcpu->stat.irq_injections;
2628
	if (vmx->rmode.vm86_active) {
2629 2630
		vmx->rmode.irq.pending = true;
		vmx->rmode.irq.vector = irq;
2631
		vmx->rmode.irq.rip = kvm_rip_read(vcpu);
2632 2633 2634
		if (vcpu->arch.interrupt.soft)
			vmx->rmode.irq.rip +=
				vmx->vcpu.arch.event_exit_inst_len;
2635 2636 2637
		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			     irq | INTR_TYPE_SOFT_INTR | INTR_INFO_VALID_MASK);
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
2638
		kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
2639 2640
		return;
	}
2641 2642 2643 2644 2645 2646 2647 2648
	intr = irq | INTR_INFO_VALID_MASK;
	if (vcpu->arch.interrupt.soft) {
		intr |= INTR_TYPE_SOFT_INTR;
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
			     vmx->vcpu.arch.event_exit_inst_len);
	} else
		intr |= INTR_TYPE_EXT_INTR;
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
2649 2650
}

2651 2652
static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
{
J
Jan Kiszka 已提交
2653 2654
	struct vcpu_vmx *vmx = to_vmx(vcpu);

2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667
	if (!cpu_has_virtual_nmis()) {
		/*
		 * Tracking the NMI-blocked state in software is built upon
		 * finding the next open IRQ window. This, in turn, depends on
		 * well-behaving guests: They have to keep IRQs disabled at
		 * least as long as the NMI handler runs. Otherwise we may
		 * cause NMI nesting, maybe breaking the guest. But as this is
		 * highly unlikely, we can live with the residual risk.
		 */
		vmx->soft_vnmi_blocked = 1;
		vmx->vnmi_blocked_time = 0;
	}

2668
	++vcpu->stat.nmi_injections;
2669
	if (vmx->rmode.vm86_active) {
J
Jan Kiszka 已提交
2670 2671 2672 2673 2674 2675 2676 2677 2678 2679
		vmx->rmode.irq.pending = true;
		vmx->rmode.irq.vector = NMI_VECTOR;
		vmx->rmode.irq.rip = kvm_rip_read(vcpu);
		vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			     NMI_VECTOR | INTR_TYPE_SOFT_INTR |
			     INTR_INFO_VALID_MASK);
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN, 1);
		kvm_rip_write(vcpu, vmx->rmode.irq.rip - 1);
		return;
	}
2680 2681 2682 2683
	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
			INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
}

2684
static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
2685
{
2686
	if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
2687
		return 0;
2688

2689 2690 2691
	return	!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
			(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS |
				GUEST_INTR_STATE_NMI));
2692 2693
}

J
Jan Kiszka 已提交
2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721
static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu)
{
	if (!cpu_has_virtual_nmis())
		return to_vmx(vcpu)->soft_vnmi_blocked;
	else
		return !!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
			  GUEST_INTR_STATE_NMI);
}

static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);

	if (!cpu_has_virtual_nmis()) {
		if (vmx->soft_vnmi_blocked != masked) {
			vmx->soft_vnmi_blocked = masked;
			vmx->vnmi_blocked_time = 0;
		}
	} else {
		if (masked)
			vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
				      GUEST_INTR_STATE_NMI);
		else
			vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
					GUEST_INTR_STATE_NMI);
	}
}

2722 2723
static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
{
2724 2725 2726
	return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
		!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
			(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
2727 2728
}

2729 2730 2731 2732
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
{
	int ret;
	struct kvm_userspace_memory_region tss_mem = {
2733
		.slot = TSS_PRIVATE_MEMSLOT,
2734 2735 2736 2737 2738 2739 2740 2741
		.guest_phys_addr = addr,
		.memory_size = PAGE_SIZE * 3,
		.flags = 0,
	};

	ret = kvm_set_memory_region(kvm, &tss_mem, 0);
	if (ret)
		return ret;
2742
	kvm->arch.tss_addr = addr;
2743 2744 2745
	return 0;
}

A
Avi Kivity 已提交
2746 2747 2748
static int handle_rmode_exception(struct kvm_vcpu *vcpu,
				  int vec, u32 err_code)
{
2749 2750 2751 2752 2753
	/*
	 * 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)
A
Avi Kivity 已提交
2754
		if (emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DONE)
A
Avi Kivity 已提交
2755
			return 1;
2756 2757 2758 2759 2760 2761 2762
	/*
	 * Forward all other exceptions that are valid in real mode.
	 * FIXME: Breaks guest debugging in real mode, needs to be fixed with
	 *        the required debugging infrastructure rework.
	 */
	switch (vec) {
	case DB_VECTOR:
J
Jan Kiszka 已提交
2763 2764 2765 2766 2767
		if (vcpu->guest_debug &
		    (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
			return 0;
		kvm_queue_exception(vcpu, vec);
		return 1;
2768
	case BP_VECTOR:
J
Jan Kiszka 已提交
2769 2770 2771 2772
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
			return 0;
		/* fall through */
	case DE_VECTOR:
2773 2774 2775 2776 2777 2778 2779 2780 2781 2782
	case OF_VECTOR:
	case BR_VECTOR:
	case UD_VECTOR:
	case DF_VECTOR:
	case SS_VECTOR:
	case GP_VECTOR:
	case MF_VECTOR:
		kvm_queue_exception(vcpu, vec);
		return 1;
	}
A
Avi Kivity 已提交
2783 2784 2785
	return 0;
}

A
Andi Kleen 已提交
2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804
/*
 * Trigger machine check on the host. We assume all the MSRs are already set up
 * by the CPU and that we still run on the same CPU as the MCE occurred on.
 * We pass a fake environment to the machine check handler because we want
 * the guest to be always treated like user space, no matter what context
 * it used internally.
 */
static void kvm_machine_check(void)
{
#if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
	struct pt_regs regs = {
		.cs = 3, /* Fake ring 3 no matter what the guest ran on */
		.flags = X86_EFLAGS_IF,
	};

	do_machine_check(&regs, 0);
#endif
}

A
Avi Kivity 已提交
2805
static int handle_machine_check(struct kvm_vcpu *vcpu)
A
Andi Kleen 已提交
2806 2807 2808 2809 2810
{
	/* already handled by vcpu_run */
	return 1;
}

A
Avi Kivity 已提交
2811
static int handle_exception(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
2812
{
2813
	struct vcpu_vmx *vmx = to_vmx(vcpu);
A
Avi Kivity 已提交
2814
	struct kvm_run *kvm_run = vcpu->run;
J
Jan Kiszka 已提交
2815
	u32 intr_info, ex_no, error_code;
2816
	unsigned long cr2, rip, dr6;
A
Avi Kivity 已提交
2817 2818 2819
	u32 vect_info;
	enum emulation_result er;

2820
	vect_info = vmx->idt_vectoring_info;
A
Avi Kivity 已提交
2821 2822
	intr_info = vmcs_read32(VM_EXIT_INTR_INFO);

A
Andi Kleen 已提交
2823
	if (is_machine_check(intr_info))
A
Avi Kivity 已提交
2824
		return handle_machine_check(vcpu);
A
Andi Kleen 已提交
2825

A
Avi Kivity 已提交
2826
	if ((vect_info & VECTORING_INFO_VALID_MASK) &&
2827 2828 2829 2830 2831 2832 2833 2834
	    !is_page_fault(intr_info)) {
		vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
		vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX;
		vcpu->run->internal.ndata = 2;
		vcpu->run->internal.data[0] = vect_info;
		vcpu->run->internal.data[1] = intr_info;
		return 0;
	}
A
Avi Kivity 已提交
2835

2836
	if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
2837
		return 1;  /* already handled by vmx_vcpu_run() */
2838 2839

	if (is_no_device(intr_info)) {
2840
		vmx_fpu_activate(vcpu);
2841 2842 2843
		return 1;
	}

2844
	if (is_invalid_opcode(intr_info)) {
A
Avi Kivity 已提交
2845
		er = emulate_instruction(vcpu, 0, 0, EMULTYPE_TRAP_UD);
2846
		if (er != EMULATE_DONE)
2847
			kvm_queue_exception(vcpu, UD_VECTOR);
2848 2849 2850
		return 1;
	}

A
Avi Kivity 已提交
2851
	error_code = 0;
2852
	rip = kvm_rip_read(vcpu);
2853
	if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
A
Avi Kivity 已提交
2854 2855
		error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
	if (is_page_fault(intr_info)) {
2856
		/* EPT won't cause page fault directly */
2857
		if (enable_ept)
2858
			BUG();
A
Avi Kivity 已提交
2859
		cr2 = vmcs_readl(EXIT_QUALIFICATION);
2860 2861
		trace_kvm_page_fault(cr2, error_code);

2862
		if (kvm_event_needs_reinjection(vcpu))
2863
			kvm_mmu_unprotect_page_virt(vcpu, cr2);
2864
		return kvm_mmu_page_fault(vcpu, cr2, error_code);
A
Avi Kivity 已提交
2865 2866
	}

2867
	if (vmx->rmode.vm86_active &&
A
Avi Kivity 已提交
2868
	    handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
2869
								error_code)) {
2870 2871
		if (vcpu->arch.halt_request) {
			vcpu->arch.halt_request = 0;
2872 2873
			return kvm_emulate_halt(vcpu);
		}
A
Avi Kivity 已提交
2874
		return 1;
2875
	}
A
Avi Kivity 已提交
2876

J
Jan Kiszka 已提交
2877
	ex_no = intr_info & INTR_INFO_VECTOR_MASK;
2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890
	switch (ex_no) {
	case DB_VECTOR:
		dr6 = vmcs_readl(EXIT_QUALIFICATION);
		if (!(vcpu->guest_debug &
		      (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
			vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
			kvm_queue_exception(vcpu, DB_VECTOR);
			return 1;
		}
		kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
		kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
		/* fall through */
	case BP_VECTOR:
A
Avi Kivity 已提交
2891
		kvm_run->exit_reason = KVM_EXIT_DEBUG;
J
Jan Kiszka 已提交
2892 2893
		kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
		kvm_run->debug.arch.exception = ex_no;
2894 2895
		break;
	default:
J
Jan Kiszka 已提交
2896 2897 2898
		kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
		kvm_run->ex.exception = ex_no;
		kvm_run->ex.error_code = error_code;
2899
		break;
A
Avi Kivity 已提交
2900 2901 2902 2903
	}
	return 0;
}

A
Avi Kivity 已提交
2904
static int handle_external_interrupt(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
2905
{
A
Avi Kivity 已提交
2906
	++vcpu->stat.irq_exits;
A
Avi Kivity 已提交
2907 2908 2909
	return 1;
}

A
Avi Kivity 已提交
2910
static int handle_triple_fault(struct kvm_vcpu *vcpu)
2911
{
A
Avi Kivity 已提交
2912
	vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
2913 2914
	return 0;
}
A
Avi Kivity 已提交
2915

A
Avi Kivity 已提交
2916
static int handle_io(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
2917
{
2918
	unsigned long exit_qualification;
2919
	int size, in, string;
2920
	unsigned port;
A
Avi Kivity 已提交
2921

A
Avi Kivity 已提交
2922
	++vcpu->stat.io_exits;
2923
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
2924
	string = (exit_qualification & 16) != 0;
2925 2926

	if (string) {
A
Avi Kivity 已提交
2927
		if (emulate_instruction(vcpu, 0, 0, 0) == EMULATE_DO_MMIO)
2928 2929 2930 2931 2932 2933
			return 0;
		return 1;
	}

	size = (exit_qualification & 7) + 1;
	in = (exit_qualification & 8) != 0;
2934
	port = exit_qualification >> 16;
2935

2936
	skip_emulated_instruction(vcpu);
A
Avi Kivity 已提交
2937
	return kvm_emulate_pio(vcpu, in, size, port);
A
Avi Kivity 已提交
2938 2939
}

I
Ingo Molnar 已提交
2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950
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
2951
static int handle_cr(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
2952
{
2953
	unsigned long exit_qualification, val;
A
Avi Kivity 已提交
2954 2955 2956
	int cr;
	int reg;

2957
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
A
Avi Kivity 已提交
2958 2959 2960 2961
	cr = exit_qualification & 15;
	reg = (exit_qualification >> 8) & 15;
	switch ((exit_qualification >> 4) & 3) {
	case 0: /* mov to cr */
2962 2963
		val = kvm_register_read(vcpu, reg);
		trace_kvm_cr_write(cr, val);
A
Avi Kivity 已提交
2964 2965
		switch (cr) {
		case 0:
2966
			kvm_set_cr0(vcpu, val);
A
Avi Kivity 已提交
2967 2968 2969
			skip_emulated_instruction(vcpu);
			return 1;
		case 3:
2970
			kvm_set_cr3(vcpu, val);
A
Avi Kivity 已提交
2971 2972 2973
			skip_emulated_instruction(vcpu);
			return 1;
		case 4:
2974
			kvm_set_cr4(vcpu, val);
A
Avi Kivity 已提交
2975 2976
			skip_emulated_instruction(vcpu);
			return 1;
2977 2978 2979 2980 2981 2982 2983 2984 2985
		case 8: {
				u8 cr8_prev = kvm_get_cr8(vcpu);
				u8 cr8 = kvm_register_read(vcpu, reg);
				kvm_set_cr8(vcpu, cr8);
				skip_emulated_instruction(vcpu);
				if (irqchip_in_kernel(vcpu->kvm))
					return 1;
				if (cr8_prev <= cr8)
					return 1;
A
Avi Kivity 已提交
2986
				vcpu->run->exit_reason = KVM_EXIT_SET_TPR;
2987 2988
				return 0;
			}
A
Avi Kivity 已提交
2989 2990
		};
		break;
2991
	case 2: /* clts */
2992
		vmx_fpu_deactivate(vcpu);
2993 2994
		vcpu->arch.cr0 &= ~X86_CR0_TS;
		vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
2995
		vmx_fpu_activate(vcpu);
2996 2997
		skip_emulated_instruction(vcpu);
		return 1;
A
Avi Kivity 已提交
2998 2999 3000
	case 1: /*mov from cr*/
		switch (cr) {
		case 3:
3001
			kvm_register_write(vcpu, reg, vcpu->arch.cr3);
3002
			trace_kvm_cr_read(cr, vcpu->arch.cr3);
A
Avi Kivity 已提交
3003 3004 3005
			skip_emulated_instruction(vcpu);
			return 1;
		case 8:
3006 3007 3008
			val = kvm_get_cr8(vcpu);
			kvm_register_write(vcpu, reg, val);
			trace_kvm_cr_read(cr, val);
A
Avi Kivity 已提交
3009 3010 3011 3012 3013
			skip_emulated_instruction(vcpu);
			return 1;
		}
		break;
	case 3: /* lmsw */
3014
		kvm_lmsw(vcpu, (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f);
A
Avi Kivity 已提交
3015 3016 3017 3018 3019 3020

		skip_emulated_instruction(vcpu);
		return 1;
	default:
		break;
	}
A
Avi Kivity 已提交
3021
	vcpu->run->exit_reason = 0;
3022
	pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
A
Avi Kivity 已提交
3023 3024 3025 3026
	       (int)(exit_qualification >> 4) & 3, cr);
	return 0;
}

A
Avi Kivity 已提交
3027
static int handle_dr(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
3028
{
3029
	unsigned long exit_qualification;
A
Avi Kivity 已提交
3030 3031 3032
	unsigned long val;
	int dr, reg;

3033 3034
	if (!kvm_require_cpl(vcpu, 0))
		return 1;
3035 3036 3037 3038 3039 3040 3041 3042
	dr = vmcs_readl(GUEST_DR7);
	if (dr & DR7_GD) {
		/*
		 * As the vm-exit takes precedence over the debug trap, we
		 * need to emulate the latter, either for the host or the
		 * guest debugging itself.
		 */
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
A
Avi Kivity 已提交
3043 3044 3045
			vcpu->run->debug.arch.dr6 = vcpu->arch.dr6;
			vcpu->run->debug.arch.dr7 = dr;
			vcpu->run->debug.arch.pc =
3046 3047
				vmcs_readl(GUEST_CS_BASE) +
				vmcs_readl(GUEST_RIP);
A
Avi Kivity 已提交
3048 3049
			vcpu->run->debug.arch.exception = DB_VECTOR;
			vcpu->run->exit_reason = KVM_EXIT_DEBUG;
3050 3051 3052 3053 3054 3055 3056 3057 3058 3059
			return 0;
		} else {
			vcpu->arch.dr7 &= ~DR7_GD;
			vcpu->arch.dr6 |= DR6_BD;
			vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
			kvm_queue_exception(vcpu, DB_VECTOR);
			return 1;
		}
	}

3060
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3061 3062 3063
	dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
	reg = DEBUG_REG_ACCESS_REG(exit_qualification);
	if (exit_qualification & TYPE_MOV_FROM_DR) {
A
Avi Kivity 已提交
3064
		switch (dr) {
3065 3066 3067
		case 0 ... 3:
			val = vcpu->arch.db[dr];
			break;
A
Avi Kivity 已提交
3068
		case 6:
3069
			val = vcpu->arch.dr6;
A
Avi Kivity 已提交
3070 3071
			break;
		case 7:
3072
			val = vcpu->arch.dr7;
A
Avi Kivity 已提交
3073 3074 3075 3076
			break;
		default:
			val = 0;
		}
3077
		kvm_register_write(vcpu, reg, val);
A
Avi Kivity 已提交
3078
	} else {
3079 3080 3081 3082 3083 3084 3085 3086
		val = vcpu->arch.regs[reg];
		switch (dr) {
		case 0 ... 3:
			vcpu->arch.db[dr] = val;
			if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
				vcpu->arch.eff_db[dr] = val;
			break;
		case 4 ... 5:
3087
			if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109
				kvm_queue_exception(vcpu, UD_VECTOR);
			break;
		case 6:
			if (val & 0xffffffff00000000ULL) {
				kvm_queue_exception(vcpu, GP_VECTOR);
				break;
			}
			vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
			break;
		case 7:
			if (val & 0xffffffff00000000ULL) {
				kvm_queue_exception(vcpu, GP_VECTOR);
				break;
			}
			vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
			if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
				vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
				vcpu->arch.switch_db_regs =
					(val & DR7_BP_EN_MASK);
			}
			break;
		}
A
Avi Kivity 已提交
3110 3111 3112 3113 3114
	}
	skip_emulated_instruction(vcpu);
	return 1;
}

A
Avi Kivity 已提交
3115
static int handle_cpuid(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
3116
{
3117 3118
	kvm_emulate_cpuid(vcpu);
	return 1;
A
Avi Kivity 已提交
3119 3120
}

A
Avi Kivity 已提交
3121
static int handle_rdmsr(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
3122
{
3123
	u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
A
Avi Kivity 已提交
3124 3125 3126
	u64 data;

	if (vmx_get_msr(vcpu, ecx, &data)) {
3127
		kvm_inject_gp(vcpu, 0);
A
Avi Kivity 已提交
3128 3129 3130
		return 1;
	}

3131
	trace_kvm_msr_read(ecx, data);
F
Feng (Eric) Liu 已提交
3132

A
Avi Kivity 已提交
3133
	/* FIXME: handling of bits 32:63 of rax, rdx */
3134 3135
	vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
	vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
A
Avi Kivity 已提交
3136 3137 3138 3139
	skip_emulated_instruction(vcpu);
	return 1;
}

A
Avi Kivity 已提交
3140
static int handle_wrmsr(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
3141
{
3142 3143 3144
	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
3145

3146
	trace_kvm_msr_write(ecx, data);
F
Feng (Eric) Liu 已提交
3147

A
Avi Kivity 已提交
3148
	if (vmx_set_msr(vcpu, ecx, data) != 0) {
3149
		kvm_inject_gp(vcpu, 0);
A
Avi Kivity 已提交
3150 3151 3152 3153 3154 3155 3156
		return 1;
	}

	skip_emulated_instruction(vcpu);
	return 1;
}

A
Avi Kivity 已提交
3157
static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
3158 3159 3160 3161
{
	return 1;
}

A
Avi Kivity 已提交
3162
static int handle_interrupt_window(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
3163
{
3164 3165 3166 3167 3168 3169
	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
3170

3171
	++vcpu->stat.irq_window_exits;
F
Feng (Eric) Liu 已提交
3172

3173 3174 3175 3176
	/*
	 * If the user space waits to inject interrupts, exit as soon as
	 * possible
	 */
3177
	if (!irqchip_in_kernel(vcpu->kvm) &&
A
Avi Kivity 已提交
3178
	    vcpu->run->request_interrupt_window &&
3179
	    !kvm_cpu_has_interrupt(vcpu)) {
A
Avi Kivity 已提交
3180
		vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
3181 3182
		return 0;
	}
A
Avi Kivity 已提交
3183 3184 3185
	return 1;
}

A
Avi Kivity 已提交
3186
static int handle_halt(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
3187 3188
{
	skip_emulated_instruction(vcpu);
3189
	return kvm_emulate_halt(vcpu);
A
Avi Kivity 已提交
3190 3191
}

A
Avi Kivity 已提交
3192
static int handle_vmcall(struct kvm_vcpu *vcpu)
3193
{
3194
	skip_emulated_instruction(vcpu);
3195 3196
	kvm_emulate_hypercall(vcpu);
	return 1;
3197 3198
}

A
Avi Kivity 已提交
3199
static int handle_vmx_insn(struct kvm_vcpu *vcpu)
3200 3201 3202 3203 3204
{
	kvm_queue_exception(vcpu, UD_VECTOR);
	return 1;
}

A
Avi Kivity 已提交
3205
static int handle_invlpg(struct kvm_vcpu *vcpu)
M
Marcelo Tosatti 已提交
3206
{
3207
	unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
M
Marcelo Tosatti 已提交
3208 3209 3210 3211 3212 3213

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

A
Avi Kivity 已提交
3214
static int handle_wbinvd(struct kvm_vcpu *vcpu)
E
Eddie Dong 已提交
3215 3216 3217 3218 3219 3220
{
	skip_emulated_instruction(vcpu);
	/* TODO: Add support for VT-d/pass-through device */
	return 1;
}

A
Avi Kivity 已提交
3221
static int handle_apic_access(struct kvm_vcpu *vcpu)
3222
{
3223
	unsigned long exit_qualification;
3224 3225 3226
	enum emulation_result er;
	unsigned long offset;

3227
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3228 3229
	offset = exit_qualification & 0xffful;

A
Avi Kivity 已提交
3230
	er = emulate_instruction(vcpu, 0, 0, 0);
3231 3232 3233 3234 3235

	if (er !=  EMULATE_DONE) {
		printk(KERN_ERR
		       "Fail to handle apic access vmexit! Offset is 0x%lx\n",
		       offset);
3236
		return -ENOEXEC;
3237 3238 3239 3240
	}
	return 1;
}

A
Avi Kivity 已提交
3241
static int handle_task_switch(struct kvm_vcpu *vcpu)
3242
{
J
Jan Kiszka 已提交
3243
	struct vcpu_vmx *vmx = to_vmx(vcpu);
3244 3245
	unsigned long exit_qualification;
	u16 tss_selector;
3246 3247 3248 3249
	int reason, type, idt_v;

	idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
	type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK);
3250 3251 3252 3253

	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);

	reason = (u32)exit_qualification >> 30;
3254 3255 3256 3257 3258 3259 3260 3261 3262
	if (reason == TASK_SWITCH_GATE && idt_v) {
		switch (type) {
		case INTR_TYPE_NMI_INTR:
			vcpu->arch.nmi_injected = false;
			if (cpu_has_virtual_nmis())
				vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
					      GUEST_INTR_STATE_NMI);
			break;
		case INTR_TYPE_EXT_INTR:
3263
		case INTR_TYPE_SOFT_INTR:
3264 3265 3266 3267 3268 3269 3270 3271 3272
			kvm_clear_interrupt_queue(vcpu);
			break;
		case INTR_TYPE_HARD_EXCEPTION:
		case INTR_TYPE_SOFT_EXCEPTION:
			kvm_clear_exception_queue(vcpu);
			break;
		default:
			break;
		}
J
Jan Kiszka 已提交
3273
	}
3274 3275
	tss_selector = exit_qualification;

3276 3277 3278 3279 3280
	if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION &&
		       type != INTR_TYPE_EXT_INTR &&
		       type != INTR_TYPE_NMI_INTR))
		skip_emulated_instruction(vcpu);

3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292
	if (!kvm_task_switch(vcpu, tss_selector, reason))
		return 0;

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

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

	return 1;
3293 3294
}

A
Avi Kivity 已提交
3295
static int handle_ept_violation(struct kvm_vcpu *vcpu)
3296
{
3297
	unsigned long exit_qualification;
3298 3299 3300
	gpa_t gpa;
	int gla_validity;

3301
	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
3302 3303 3304

	if (exit_qualification & (1 << 6)) {
		printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
3305
		return -EINVAL;
3306 3307 3308 3309 3310 3311 3312
	}

	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),
3313
			vmcs_readl(GUEST_LINEAR_ADDRESS));
3314 3315
		printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
			(long unsigned int)exit_qualification);
A
Avi Kivity 已提交
3316 3317
		vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
		vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION;
3318
		return 0;
3319 3320 3321
	}

	gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
3322
	trace_kvm_page_fault(gpa, exit_qualification);
3323
	return kvm_mmu_page_fault(vcpu, gpa & PAGE_MASK, 0);
3324 3325
}

3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386
static u64 ept_rsvd_mask(u64 spte, int level)
{
	int i;
	u64 mask = 0;

	for (i = 51; i > boot_cpu_data.x86_phys_bits; i--)
		mask |= (1ULL << i);

	if (level > 2)
		/* bits 7:3 reserved */
		mask |= 0xf8;
	else if (level == 2) {
		if (spte & (1ULL << 7))
			/* 2MB ref, bits 20:12 reserved */
			mask |= 0x1ff000;
		else
			/* bits 6:3 reserved */
			mask |= 0x78;
	}

	return mask;
}

static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte,
				       int level)
{
	printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level);

	/* 010b (write-only) */
	WARN_ON((spte & 0x7) == 0x2);

	/* 110b (write/execute) */
	WARN_ON((spte & 0x7) == 0x6);

	/* 100b (execute-only) and value not supported by logical processor */
	if (!cpu_has_vmx_ept_execute_only())
		WARN_ON((spte & 0x7) == 0x4);

	/* not 000b */
	if ((spte & 0x7)) {
		u64 rsvd_bits = spte & ept_rsvd_mask(spte, level);

		if (rsvd_bits != 0) {
			printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n",
					 __func__, rsvd_bits);
			WARN_ON(1);
		}

		if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) {
			u64 ept_mem_type = (spte & 0x38) >> 3;

			if (ept_mem_type == 2 || ept_mem_type == 3 ||
			    ept_mem_type == 7) {
				printk(KERN_ERR "%s: ept_mem_type=0x%llx\n",
						__func__, ept_mem_type);
				WARN_ON(1);
			}
		}
	}
}

A
Avi Kivity 已提交
3387
static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402
{
	u64 sptes[4];
	int nr_sptes, i;
	gpa_t gpa;

	gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);

	printk(KERN_ERR "EPT: Misconfiguration.\n");
	printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa);

	nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes);

	for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i)
		ept_misconfig_inspect_spte(vcpu, sptes[i-1], i);

A
Avi Kivity 已提交
3403 3404
	vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
	vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG;
3405 3406 3407 3408

	return 0;
}

A
Avi Kivity 已提交
3409
static int handle_nmi_window(struct kvm_vcpu *vcpu)
3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421
{
	u32 cpu_based_vm_exec_control;

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

	return 1;
}

3422
static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
3423
{
3424 3425
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	enum emulation_result err = EMULATE_DONE;
3426
	int ret = 1;
3427 3428

	while (!guest_state_valid(vcpu)) {
A
Avi Kivity 已提交
3429
		err = emulate_instruction(vcpu, 0, 0, 0);
3430

3431 3432 3433 3434
		if (err == EMULATE_DO_MMIO) {
			ret = 0;
			goto out;
		}
3435 3436 3437

		if (err != EMULATE_DONE) {
			kvm_report_emulation_failure(vcpu, "emulation failure");
3438 3439
			vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
			vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
3440
			vcpu->run->internal.ndata = 0;
3441 3442
			ret = 0;
			goto out;
3443 3444 3445
		}

		if (signal_pending(current))
3446
			goto out;
3447 3448 3449 3450
		if (need_resched())
			schedule();
	}

3451 3452 3453
	vmx->emulation_required = 0;
out:
	return ret;
3454 3455
}

3456 3457 3458 3459
/*
 * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE
 * exiting, so only get here on cpu with PAUSE-Loop-Exiting.
 */
3460
static int handle_pause(struct kvm_vcpu *vcpu)
3461 3462 3463 3464 3465 3466 3467
{
	skip_emulated_instruction(vcpu);
	kvm_vcpu_on_spin(vcpu);

	return 1;
}

3468 3469 3470 3471 3472 3473
static int handle_invalid_op(struct kvm_vcpu *vcpu)
{
	kvm_queue_exception(vcpu, UD_VECTOR);
	return 1;
}

A
Avi Kivity 已提交
3474 3475 3476 3477 3478
/*
 * 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.
 */
A
Avi Kivity 已提交
3479
static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
A
Avi Kivity 已提交
3480 3481
	[EXIT_REASON_EXCEPTION_NMI]           = handle_exception,
	[EXIT_REASON_EXTERNAL_INTERRUPT]      = handle_external_interrupt,
3482
	[EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
3483
	[EXIT_REASON_NMI_WINDOW]	      = handle_nmi_window,
A
Avi Kivity 已提交
3484 3485 3486 3487 3488 3489 3490 3491
	[EXIT_REASON_IO_INSTRUCTION]          = handle_io,
	[EXIT_REASON_CR_ACCESS]               = handle_cr,
	[EXIT_REASON_DR_ACCESS]               = handle_dr,
	[EXIT_REASON_CPUID]                   = handle_cpuid,
	[EXIT_REASON_MSR_READ]                = handle_rdmsr,
	[EXIT_REASON_MSR_WRITE]               = handle_wrmsr,
	[EXIT_REASON_PENDING_INTERRUPT]       = handle_interrupt_window,
	[EXIT_REASON_HLT]                     = handle_halt,
M
Marcelo Tosatti 已提交
3492
	[EXIT_REASON_INVLPG]		      = handle_invlpg,
3493
	[EXIT_REASON_VMCALL]                  = handle_vmcall,
3494 3495 3496 3497 3498 3499 3500 3501 3502
	[EXIT_REASON_VMCLEAR]	              = handle_vmx_insn,
	[EXIT_REASON_VMLAUNCH]                = handle_vmx_insn,
	[EXIT_REASON_VMPTRLD]                 = handle_vmx_insn,
	[EXIT_REASON_VMPTRST]                 = handle_vmx_insn,
	[EXIT_REASON_VMREAD]                  = handle_vmx_insn,
	[EXIT_REASON_VMRESUME]                = handle_vmx_insn,
	[EXIT_REASON_VMWRITE]                 = handle_vmx_insn,
	[EXIT_REASON_VMOFF]                   = handle_vmx_insn,
	[EXIT_REASON_VMON]                    = handle_vmx_insn,
3503 3504
	[EXIT_REASON_TPR_BELOW_THRESHOLD]     = handle_tpr_below_threshold,
	[EXIT_REASON_APIC_ACCESS]             = handle_apic_access,
E
Eddie Dong 已提交
3505
	[EXIT_REASON_WBINVD]                  = handle_wbinvd,
3506
	[EXIT_REASON_TASK_SWITCH]             = handle_task_switch,
A
Andi Kleen 已提交
3507
	[EXIT_REASON_MCE_DURING_VMENTRY]      = handle_machine_check,
3508 3509
	[EXIT_REASON_EPT_VIOLATION]	      = handle_ept_violation,
	[EXIT_REASON_EPT_MISCONFIG]           = handle_ept_misconfig,
3510
	[EXIT_REASON_PAUSE_INSTRUCTION]       = handle_pause,
3511 3512
	[EXIT_REASON_MWAIT_INSTRUCTION]	      = handle_invalid_op,
	[EXIT_REASON_MONITOR_INSTRUCTION]     = handle_invalid_op,
A
Avi Kivity 已提交
3513 3514 3515
};

static const int kvm_vmx_max_exit_handlers =
3516
	ARRAY_SIZE(kvm_vmx_exit_handlers);
A
Avi Kivity 已提交
3517 3518 3519 3520 3521

/*
 * The guest has exited.  See if we can fix it or if we need userspace
 * assistance.
 */
A
Avi Kivity 已提交
3522
static int vmx_handle_exit(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
3523
{
3524
	struct vcpu_vmx *vmx = to_vmx(vcpu);
A
Andi Kleen 已提交
3525
	u32 exit_reason = vmx->exit_reason;
3526
	u32 vectoring_info = vmx->idt_vectoring_info;
3527

3528
	trace_kvm_exit(exit_reason, kvm_rip_read(vcpu));
F
Feng (Eric) Liu 已提交
3529

3530 3531 3532
	/* If guest state is invalid, start emulating */
	if (vmx->emulation_required && emulate_invalid_guest_state)
		return handle_invalid_guest_state(vcpu);
3533

3534 3535
	/* Access CR3 don't cause VMExit in paging mode, so we need
	 * to sync with guest real CR3. */
A
Avi Kivity 已提交
3536
	if (enable_ept && is_paging(vcpu))
3537 3538
		vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);

3539
	if (unlikely(vmx->fail)) {
A
Avi Kivity 已提交
3540 3541
		vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
		vcpu->run->fail_entry.hardware_entry_failure_reason
3542 3543 3544
			= vmcs_read32(VM_INSTRUCTION_ERROR);
		return 0;
	}
A
Avi Kivity 已提交
3545

M
Mike Day 已提交
3546
	if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
3547
			(exit_reason != EXIT_REASON_EXCEPTION_NMI &&
J
Jan Kiszka 已提交
3548 3549 3550 3551 3552
			exit_reason != EXIT_REASON_EPT_VIOLATION &&
			exit_reason != EXIT_REASON_TASK_SWITCH))
		printk(KERN_WARNING "%s: unexpected, valid vectoring info "
		       "(0x%x) and exit reason is 0x%x\n",
		       __func__, vectoring_info, exit_reason);
3553 3554

	if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
3555
		if (vmx_interrupt_allowed(vcpu)) {
3556 3557
			vmx->soft_vnmi_blocked = 0;
		} else if (vmx->vnmi_blocked_time > 1000000000LL &&
3558
			   vcpu->arch.nmi_pending) {
3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571
			/*
			 * This CPU don't support us in finding the end of an
			 * NMI-blocked window if the guest runs with IRQs
			 * disabled. So we pull the trigger after 1 s of
			 * futile waiting, but inform the user about this.
			 */
			printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
			       "state on VCPU %d after 1 s timeout\n",
			       __func__, vcpu->vcpu_id);
			vmx->soft_vnmi_blocked = 0;
		}
	}

A
Avi Kivity 已提交
3572 3573
	if (exit_reason < kvm_vmx_max_exit_handlers
	    && kvm_vmx_exit_handlers[exit_reason])
A
Avi Kivity 已提交
3574
		return kvm_vmx_exit_handlers[exit_reason](vcpu);
A
Avi Kivity 已提交
3575
	else {
A
Avi Kivity 已提交
3576 3577
		vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
		vcpu->run->hw.hardware_exit_reason = exit_reason;
A
Avi Kivity 已提交
3578 3579 3580 3581
	}
	return 0;
}

3582
static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
3583
{
3584
	if (irr == -1 || tpr < irr) {
3585 3586 3587 3588
		vmcs_write32(TPR_THRESHOLD, 0);
		return;
	}

3589
	vmcs_write32(TPR_THRESHOLD, irr);
3590 3591
}

3592 3593 3594
static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
{
	u32 exit_intr_info;
3595
	u32 idt_vectoring_info = vmx->idt_vectoring_info;
3596 3597
	bool unblock_nmi;
	u8 vector;
3598 3599
	int type;
	bool idtv_info_valid;
3600 3601

	exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
3602

A
Andi Kleen 已提交
3603 3604 3605 3606 3607 3608 3609 3610
	vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);

	/* Handle machine checks before interrupts are enabled */
	if ((vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY)
	    || (vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI
		&& is_machine_check(exit_intr_info)))
		kvm_machine_check();

3611 3612
	/* We need to handle NMIs before interrupts are enabled */
	if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
3613
	    (exit_intr_info & INTR_INFO_VALID_MASK))
3614 3615 3616 3617
		asm("int $2");

	idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;

3618 3619 3620 3621
	if (cpu_has_virtual_nmis()) {
		unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
		vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
		/*
3622
		 * SDM 3: 27.7.1.2 (September 2008)
3623 3624
		 * Re-set bit "block by NMI" before VM entry if vmexit caused by
		 * a guest IRET fault.
3625 3626 3627 3628 3629
		 * SDM 3: 23.2.2 (September 2008)
		 * Bit 12 is undefined in any of the following cases:
		 *  If the VM exit sets the valid bit in the IDT-vectoring
		 *   information field.
		 *  If the VM exit is due to a double fault.
3630
		 */
3631 3632
		if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi &&
		    vector != DF_VECTOR && !idtv_info_valid)
3633 3634
			vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
				      GUEST_INTR_STATE_NMI);
3635 3636 3637
	} else if (unlikely(vmx->soft_vnmi_blocked))
		vmx->vnmi_blocked_time +=
			ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
3638

3639 3640 3641 3642 3643 3644 3645
	vmx->vcpu.arch.nmi_injected = false;
	kvm_clear_exception_queue(&vmx->vcpu);
	kvm_clear_interrupt_queue(&vmx->vcpu);

	if (!idtv_info_valid)
		return;

3646 3647
	vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
	type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
3648

3649
	switch (type) {
3650 3651
	case INTR_TYPE_NMI_INTR:
		vmx->vcpu.arch.nmi_injected = true;
3652
		/*
3653
		 * SDM 3: 27.7.1.2 (September 2008)
3654 3655
		 * Clear bit "block by NMI" before VM entry if a NMI
		 * delivery faulted.
3656
		 */
3657 3658 3659 3660
		vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
				GUEST_INTR_STATE_NMI);
		break;
	case INTR_TYPE_SOFT_EXCEPTION:
3661 3662 3663 3664
		vmx->vcpu.arch.event_exit_inst_len =
			vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
		/* fall through */
	case INTR_TYPE_HARD_EXCEPTION:
3665
		if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
3666 3667
			u32 err = vmcs_read32(IDT_VECTORING_ERROR_CODE);
			kvm_queue_exception_e(&vmx->vcpu, vector, err);
3668 3669
		} else
			kvm_queue_exception(&vmx->vcpu, vector);
3670
		break;
3671 3672 3673 3674
	case INTR_TYPE_SOFT_INTR:
		vmx->vcpu.arch.event_exit_inst_len =
			vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
		/* fall through */
3675
	case INTR_TYPE_EXT_INTR:
3676 3677
		kvm_queue_interrupt(&vmx->vcpu, vector,
			type == INTR_TYPE_SOFT_INTR);
3678 3679 3680
		break;
	default:
		break;
3681
	}
3682 3683
}

3684 3685 3686 3687 3688 3689 3690 3691 3692
/*
 * 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;
3693
	if (kvm_rip_read(&vmx->vcpu) + 1 != vmx->rmode.irq.rip)
3694
		return;
3695
	kvm_rip_write(&vmx->vcpu, vmx->rmode.irq.rip);
3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706
	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;
}

3707 3708 3709 3710 3711 3712 3713 3714
#ifdef CONFIG_X86_64
#define R "r"
#define Q "q"
#else
#define R "e"
#define Q "l"
#endif

A
Avi Kivity 已提交
3715
static void vmx_vcpu_run(struct kvm_vcpu *vcpu)
A
Avi Kivity 已提交
3716
{
3717
	struct vcpu_vmx *vmx = to_vmx(vcpu);
3718

3719 3720 3721 3722
	/* Record the guest's net vcpu time for enforced NMI injections. */
	if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
		vmx->entry_time = ktime_get();

3723 3724 3725
	/* Don't enter VMX if guest state is invalid, let the exit handler
	   start emulation until we arrive back to a valid state */
	if (vmx->emulation_required && emulate_invalid_guest_state)
3726 3727
		return;

3728 3729 3730 3731 3732
	if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
		vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
	if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
		vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);

3733 3734 3735 3736 3737 3738 3739 3740
	/* When single-stepping over STI and MOV SS, we must clear the
	 * corresponding interruptibility bits in the guest state. Otherwise
	 * vmentry fails as it then expects bit 14 (BS) in pending debug
	 * exceptions being set, but that's not correct for the guest debugging
	 * case. */
	if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
		vmx_set_interrupt_shadow(vcpu, 0);

3741 3742 3743 3744 3745
	/*
	 * Loading guest fpu may have cleared host cr0.ts
	 */
	vmcs_writel(HOST_CR0, read_cr0());

3746 3747
	if (vcpu->arch.switch_db_regs)
		set_debugreg(vcpu->arch.dr6, 6);
3748

M
Mike Day 已提交
3749
	asm(
A
Avi Kivity 已提交
3750
		/* Store host registers */
3751 3752
		"push %%"R"dx; push %%"R"bp;"
		"push %%"R"cx \n\t"
3753 3754 3755
		"cmp %%"R"sp, %c[host_rsp](%0) \n\t"
		"je 1f \n\t"
		"mov %%"R"sp, %c[host_rsp](%0) \n\t"
3756
		__ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
3757
		"1: \n\t"
3758 3759 3760 3761 3762 3763 3764
		/* Reload cr2 if changed */
		"mov %c[cr2](%0), %%"R"ax \n\t"
		"mov %%cr2, %%"R"dx \n\t"
		"cmp %%"R"ax, %%"R"dx \n\t"
		"je 2f \n\t"
		"mov %%"R"ax, %%cr2 \n\t"
		"2: \n\t"
A
Avi Kivity 已提交
3765
		/* Check if vmlaunch of vmresume is needed */
3766
		"cmpl $0, %c[launched](%0) \n\t"
A
Avi Kivity 已提交
3767
		/* Load guest registers.  Don't clobber flags. */
3768 3769 3770 3771 3772 3773
		"mov %c[rax](%0), %%"R"ax \n\t"
		"mov %c[rbx](%0), %%"R"bx \n\t"
		"mov %c[rdx](%0), %%"R"dx \n\t"
		"mov %c[rsi](%0), %%"R"si \n\t"
		"mov %c[rdi](%0), %%"R"di \n\t"
		"mov %c[rbp](%0), %%"R"bp \n\t"
3774
#ifdef CONFIG_X86_64
3775 3776 3777 3778 3779 3780 3781 3782
		"mov %c[r8](%0),  %%r8  \n\t"
		"mov %c[r9](%0),  %%r9  \n\t"
		"mov %c[r10](%0), %%r10 \n\t"
		"mov %c[r11](%0), %%r11 \n\t"
		"mov %c[r12](%0), %%r12 \n\t"
		"mov %c[r13](%0), %%r13 \n\t"
		"mov %c[r14](%0), %%r14 \n\t"
		"mov %c[r15](%0), %%r15 \n\t"
A
Avi Kivity 已提交
3783
#endif
3784 3785
		"mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */

A
Avi Kivity 已提交
3786
		/* Enter guest mode */
3787
		"jne .Llaunched \n\t"
3788
		__ex(ASM_VMX_VMLAUNCH) "\n\t"
3789
		"jmp .Lkvm_vmx_return \n\t"
3790
		".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
3791
		".Lkvm_vmx_return: "
A
Avi Kivity 已提交
3792
		/* Save guest registers, load host registers, keep flags */
3793 3794 3795 3796 3797 3798 3799 3800
		"xchg %0,     (%%"R"sp) \n\t"
		"mov %%"R"ax, %c[rax](%0) \n\t"
		"mov %%"R"bx, %c[rbx](%0) \n\t"
		"push"Q" (%%"R"sp); pop"Q" %c[rcx](%0) \n\t"
		"mov %%"R"dx, %c[rdx](%0) \n\t"
		"mov %%"R"si, %c[rsi](%0) \n\t"
		"mov %%"R"di, %c[rdi](%0) \n\t"
		"mov %%"R"bp, %c[rbp](%0) \n\t"
3801
#ifdef CONFIG_X86_64
3802 3803 3804 3805 3806 3807 3808 3809
		"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
3810
#endif
3811 3812 3813 3814
		"mov %%cr2, %%"R"ax   \n\t"
		"mov %%"R"ax, %c[cr2](%0) \n\t"

		"pop  %%"R"bp; pop  %%"R"bp; pop  %%"R"dx \n\t"
3815 3816 3817 3818
		"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)),
3819
		[host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
3820 3821 3822 3823 3824 3825 3826
		[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])),
3827
#ifdef CONFIG_X86_64
3828 3829 3830 3831 3832 3833 3834 3835
		[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
3836
#endif
3837
		[cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2))
3838
	      : "cc", "memory"
3839
		, R"bx", R"di", R"si"
3840 3841 3842 3843
#ifdef CONFIG_X86_64
		, "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
#endif
	      );
A
Avi Kivity 已提交
3844

A
Avi Kivity 已提交
3845 3846
	vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
				  | (1 << VCPU_EXREG_PDPTR));
3847 3848
	vcpu->arch.regs_dirty = 0;

3849 3850
	if (vcpu->arch.switch_db_regs)
		get_debugreg(vcpu->arch.dr6, 6);
3851

3852
	vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
3853 3854
	if (vmx->rmode.irq.pending)
		fixup_rmode_irq(vmx);
3855

M
Mike Day 已提交
3856
	asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
3857
	vmx->launched = 1;
3858

3859
	vmx_complete_interrupts(vmx);
A
Avi Kivity 已提交
3860 3861
}

3862 3863 3864
#undef R
#undef Q

A
Avi Kivity 已提交
3865 3866
static void vmx_free_vmcs(struct kvm_vcpu *vcpu)
{
3867 3868 3869
	struct vcpu_vmx *vmx = to_vmx(vcpu);

	if (vmx->vmcs) {
3870
		vcpu_clear(vmx);
3871 3872
		free_vmcs(vmx->vmcs);
		vmx->vmcs = NULL;
A
Avi Kivity 已提交
3873 3874 3875 3876 3877
	}
}

static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
{
R
Rusty Russell 已提交
3878 3879
	struct vcpu_vmx *vmx = to_vmx(vcpu);

3880 3881 3882 3883
	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
3884
	vmx_free_vmcs(vcpu);
R
Rusty Russell 已提交
3885 3886
	kfree(vmx->guest_msrs);
	kvm_vcpu_uninit(vcpu);
3887
	kmem_cache_free(kvm_vcpu_cache, vmx);
A
Avi Kivity 已提交
3888 3889
}

R
Rusty Russell 已提交
3890
static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
A
Avi Kivity 已提交
3891
{
R
Rusty Russell 已提交
3892
	int err;
3893
	struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
3894
	int cpu;
A
Avi Kivity 已提交
3895

3896
	if (!vmx)
R
Rusty Russell 已提交
3897 3898
		return ERR_PTR(-ENOMEM);

3899 3900
	allocate_vpid(vmx);

R
Rusty Russell 已提交
3901 3902 3903
	err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
	if (err)
		goto free_vcpu;
3904

3905
	vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
R
Rusty Russell 已提交
3906 3907 3908 3909
	if (!vmx->guest_msrs) {
		err = -ENOMEM;
		goto uninit_vcpu;
	}
3910

3911 3912
	vmx->vmcs = alloc_vmcs();
	if (!vmx->vmcs)
R
Rusty Russell 已提交
3913
		goto free_msrs;
3914 3915 3916

	vmcs_clear(vmx->vmcs);

3917 3918
	cpu = get_cpu();
	vmx_vcpu_load(&vmx->vcpu, cpu);
R
Rusty Russell 已提交
3919
	err = vmx_vcpu_setup(vmx);
R
Rusty Russell 已提交
3920
	vmx_vcpu_put(&vmx->vcpu);
3921
	put_cpu();
R
Rusty Russell 已提交
3922 3923
	if (err)
		goto free_vmcs;
3924 3925 3926
	if (vm_need_virtualize_apic_accesses(kvm))
		if (alloc_apic_access_page(kvm) != 0)
			goto free_vmcs;
R
Rusty Russell 已提交
3927

3928 3929 3930 3931
	if (enable_ept) {
		if (!kvm->arch.ept_identity_map_addr)
			kvm->arch.ept_identity_map_addr =
				VMX_EPT_IDENTITY_PAGETABLE_ADDR;
3932 3933
		if (alloc_identity_pagetable(kvm) != 0)
			goto free_vmcs;
3934
	}
3935

R
Rusty Russell 已提交
3936 3937 3938 3939 3940 3941 3942 3943 3944
	return &vmx->vcpu;

free_vmcs:
	free_vmcs(vmx->vmcs);
free_msrs:
	kfree(vmx->guest_msrs);
uninit_vcpu:
	kvm_vcpu_uninit(&vmx->vcpu);
free_vcpu:
3945
	kmem_cache_free(kvm_vcpu_cache, vmx);
R
Rusty Russell 已提交
3946
	return ERR_PTR(err);
A
Avi Kivity 已提交
3947 3948
}

Y
Yang, Sheng 已提交
3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962
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;
	}
}

3963 3964 3965 3966 3967
static int get_ept_level(void)
{
	return VMX_EPT_DEFAULT_GAW + 1;
}

3968
static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
S
Sheng Yang 已提交
3969
{
3970 3971
	u64 ret;

3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982
	/* For VT-d and EPT combination
	 * 1. MMIO: always map as UC
	 * 2. EPT with VT-d:
	 *   a. VT-d without snooping control feature: can't guarantee the
	 *	result, try to trust guest.
	 *   b. VT-d with snooping control feature: snooping control feature of
	 *	VT-d engine can guarantee the cache correctness. Just set it
	 *	to WB to keep consistent with host. So the same as item 3.
	 * 3. EPT without VT-d: always map as WB and set IGMT=1 to keep
	 *    consistent with host MTRR
	 */
3983 3984
	if (is_mmio)
		ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT;
3985 3986 3987 3988
	else if (vcpu->kvm->arch.iommu_domain &&
		!(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY))
		ret = kvm_get_guest_memory_type(vcpu, gfn) <<
		      VMX_EPT_MT_EPTE_SHIFT;
3989
	else
3990 3991
		ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT)
			| VMX_EPT_IGMT_BIT;
3992 3993

	return ret;
S
Sheng Yang 已提交
3994 3995
}

3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018
static const struct trace_print_flags vmx_exit_reasons_str[] = {
	{ EXIT_REASON_EXCEPTION_NMI,           "exception" },
	{ EXIT_REASON_EXTERNAL_INTERRUPT,      "ext_irq" },
	{ EXIT_REASON_TRIPLE_FAULT,            "triple_fault" },
	{ EXIT_REASON_NMI_WINDOW,              "nmi_window" },
	{ EXIT_REASON_IO_INSTRUCTION,          "io_instruction" },
	{ EXIT_REASON_CR_ACCESS,               "cr_access" },
	{ EXIT_REASON_DR_ACCESS,               "dr_access" },
	{ EXIT_REASON_CPUID,                   "cpuid" },
	{ EXIT_REASON_MSR_READ,                "rdmsr" },
	{ EXIT_REASON_MSR_WRITE,               "wrmsr" },
	{ EXIT_REASON_PENDING_INTERRUPT,       "interrupt_window" },
	{ EXIT_REASON_HLT,                     "halt" },
	{ EXIT_REASON_INVLPG,                  "invlpg" },
	{ EXIT_REASON_VMCALL,                  "hypercall" },
	{ EXIT_REASON_TPR_BELOW_THRESHOLD,     "tpr_below_thres" },
	{ EXIT_REASON_APIC_ACCESS,             "apic_access" },
	{ EXIT_REASON_WBINVD,                  "wbinvd" },
	{ EXIT_REASON_TASK_SWITCH,             "task_switch" },
	{ EXIT_REASON_EPT_VIOLATION,           "ept_violation" },
	{ -1, NULL }
};

4019 4020 4021 4022 4023
static bool vmx_gb_page_enable(void)
{
	return false;
}

4024 4025 4026 4027 4028
static inline u32 bit(int bitno)
{
	return 1 << (bitno & 31);
}

4029 4030
static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
{
4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048
	struct kvm_cpuid_entry2 *best;
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	u32 exec_control;

	vmx->rdtscp_enabled = false;
	if (vmx_rdtscp_supported()) {
		exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
		if (exec_control & SECONDARY_EXEC_RDTSCP) {
			best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
			if (best && (best->edx & bit(X86_FEATURE_RDTSCP)))
				vmx->rdtscp_enabled = true;
			else {
				exec_control &= ~SECONDARY_EXEC_RDTSCP;
				vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
						exec_control);
			}
		}
	}
4049 4050
}

4051
static struct kvm_x86_ops vmx_x86_ops = {
A
Avi Kivity 已提交
4052 4053 4054 4055
	.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
4056
	.check_processor_compatibility = vmx_check_processor_compat,
A
Avi Kivity 已提交
4057 4058
	.hardware_enable = hardware_enable,
	.hardware_disable = hardware_disable,
4059
	.cpu_has_accelerated_tpr = report_flexpriority,
A
Avi Kivity 已提交
4060 4061 4062

	.vcpu_create = vmx_create_vcpu,
	.vcpu_free = vmx_free_vcpu,
4063
	.vcpu_reset = vmx_vcpu_reset,
A
Avi Kivity 已提交
4064

4065
	.prepare_guest_switch = vmx_save_host_state,
A
Avi Kivity 已提交
4066 4067 4068 4069 4070 4071 4072 4073 4074
	.vcpu_load = vmx_vcpu_load,
	.vcpu_put = vmx_vcpu_put,

	.set_guest_debug = set_guest_debug,
	.get_msr = vmx_get_msr,
	.set_msr = vmx_set_msr,
	.get_segment_base = vmx_get_segment_base,
	.get_segment = vmx_get_segment,
	.set_segment = vmx_set_segment,
4075
	.get_cpl = vmx_get_cpl,
A
Avi Kivity 已提交
4076
	.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
4077
	.decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
A
Avi Kivity 已提交
4078 4079 4080 4081 4082 4083 4084 4085
	.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,
4086
	.cache_reg = vmx_cache_reg,
A
Avi Kivity 已提交
4087 4088 4089 4090 4091 4092
	.get_rflags = vmx_get_rflags,
	.set_rflags = vmx_set_rflags,

	.tlb_flush = vmx_flush_tlb,

	.run = vmx_vcpu_run,
4093
	.handle_exit = vmx_handle_exit,
A
Avi Kivity 已提交
4094
	.skip_emulated_instruction = skip_emulated_instruction,
4095 4096
	.set_interrupt_shadow = vmx_set_interrupt_shadow,
	.get_interrupt_shadow = vmx_get_interrupt_shadow,
I
Ingo Molnar 已提交
4097
	.patch_hypercall = vmx_patch_hypercall,
E
Eddie Dong 已提交
4098
	.set_irq = vmx_inject_irq,
4099
	.set_nmi = vmx_inject_nmi,
4100
	.queue_exception = vmx_queue_exception,
4101
	.interrupt_allowed = vmx_interrupt_allowed,
4102
	.nmi_allowed = vmx_nmi_allowed,
J
Jan Kiszka 已提交
4103 4104
	.get_nmi_mask = vmx_get_nmi_mask,
	.set_nmi_mask = vmx_set_nmi_mask,
4105 4106 4107 4108
	.enable_nmi_window = enable_nmi_window,
	.enable_irq_window = enable_irq_window,
	.update_cr8_intercept = update_cr8_intercept,

4109
	.set_tss_addr = vmx_set_tss_addr,
4110
	.get_tdp_level = get_ept_level,
4111
	.get_mt_mask = vmx_get_mt_mask,
4112 4113

	.exit_reasons_str = vmx_exit_reasons_str,
4114
	.gb_page_enable = vmx_gb_page_enable,
4115 4116

	.cpuid_update = vmx_cpuid_update,
4117 4118

	.rdtscp_supported = vmx_rdtscp_supported,
A
Avi Kivity 已提交
4119 4120 4121 4122
};

static int __init vmx_init(void)
{
4123 4124 4125 4126 4127 4128
	int r, i;

	rdmsrl_safe(MSR_EFER, &host_efer);

	for (i = 0; i < NR_VMX_MSR; ++i)
		kvm_define_shared_msr(i, vmx_msr_index[i]);
4129

4130
	vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);
4131 4132 4133
	if (!vmx_io_bitmap_a)
		return -ENOMEM;

4134
	vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
4135 4136 4137 4138 4139
	if (!vmx_io_bitmap_b) {
		r = -ENOMEM;
		goto out;
	}

4140 4141
	vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_msr_bitmap_legacy) {
S
Sheng Yang 已提交
4142 4143 4144 4145
		r = -ENOMEM;
		goto out1;
	}

4146 4147 4148 4149 4150 4151
	vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
	if (!vmx_msr_bitmap_longmode) {
		r = -ENOMEM;
		goto out2;
	}

4152 4153 4154 4155
	/*
	 * Allow direct access to the PC debug port (it is often used for I/O
	 * delays, but the vmexits simply slow things down).
	 */
4156 4157
	memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE);
	clear_bit(0x80, vmx_io_bitmap_a);
4158

4159
	memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE);
4160

4161 4162
	memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
	memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
S
Sheng Yang 已提交
4163

4164 4165
	set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */

4166
	r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx), THIS_MODULE);
4167
	if (r)
4168
		goto out3;
S
Sheng Yang 已提交
4169

4170 4171 4172 4173 4174 4175
	vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
	vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
	vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
	vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
	vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
	vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
4176

4177
	if (enable_ept) {
4178
		bypass_guest_pf = 0;
4179
		kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK |
4180
			VMX_EPT_WRITABLE_MASK);
4181
		kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
4182
				VMX_EPT_EXECUTABLE_MASK);
4183 4184 4185
		kvm_enable_tdp();
	} else
		kvm_disable_tdp();
4186

4187 4188 4189
	if (bypass_guest_pf)
		kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);

4190 4191
	return 0;

4192 4193
out3:
	free_page((unsigned long)vmx_msr_bitmap_longmode);
S
Sheng Yang 已提交
4194
out2:
4195
	free_page((unsigned long)vmx_msr_bitmap_legacy);
4196
out1:
4197
	free_page((unsigned long)vmx_io_bitmap_b);
4198
out:
4199
	free_page((unsigned long)vmx_io_bitmap_a);
4200
	return r;
A
Avi Kivity 已提交
4201 4202 4203 4204
}

static void __exit vmx_exit(void)
{
4205 4206
	free_page((unsigned long)vmx_msr_bitmap_legacy);
	free_page((unsigned long)vmx_msr_bitmap_longmode);
4207 4208
	free_page((unsigned long)vmx_io_bitmap_b);
	free_page((unsigned long)vmx_io_bitmap_a);
4209

4210
	kvm_exit();
A
Avi Kivity 已提交
4211 4212 4213 4214
}

module_init(vmx_init)
module_exit(vmx_exit)