arch/x86/kvm/vmx.c

/*
 * 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.
 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
 *
 * 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.
 *
 */

#include "irq.h"
#include "mmu.h"
#include "cpuid.h"
#include "lapic.h"

#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/sched.h>
#include <linux/moduleparam.h>
#include <linux/mod_devicetable.h>
#include <linux/trace_events.h>
#include <linux/slab.h>
#include <linux/tboot.h>
#include <linux/hrtimer.h>
#include <linux/frame.h>
#include "kvm_cache_regs.h"
#include "x86.h"

#include <asm/cpu.h>
#include <asm/io.h>
#include <asm/desc.h>
#include <asm/vmx.h>
#include <asm/virtext.h>
#include <asm/mce.h>
#include <asm/fpu/internal.h>
#include <asm/perf_event.h>
#include <asm/debugreg.h>
#include <asm/kexec.h>
#include <asm/apic.h>
#include <asm/irq_remapping.h>
#include <asm/mmu_context.h>

#include "trace.h"
#include "pmu.h"

#define __ex(x) __kvm_handle_fault_on_reboot(x)
#define __ex_clear(x, reg) \
	____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg)

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

static const struct x86_cpu_id vmx_cpu_id[] = {
	X86_FEATURE_MATCH(X86_FEATURE_VMX),
	{}
};
MODULE_DEVICE_TABLE(x86cpu, vmx_cpu_id);

static bool __read_mostly enable_vpid = 1;
module_param_named(vpid, enable_vpid, bool, 0444);

static bool __read_mostly flexpriority_enabled = 1;
module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);

static bool __read_mostly enable_ept = 1;
module_param_named(ept, enable_ept, bool, S_IRUGO);

static bool __read_mostly enable_unrestricted_guest = 1;
module_param_named(unrestricted_guest,
			enable_unrestricted_guest, bool, S_IRUGO);

static bool __read_mostly enable_ept_ad_bits = 1;
module_param_named(eptad, enable_ept_ad_bits, bool, S_IRUGO);

static bool __read_mostly emulate_invalid_guest_state = true;
module_param(emulate_invalid_guest_state, bool, S_IRUGO);

static bool __read_mostly fasteoi = 1;
module_param(fasteoi, bool, S_IRUGO);

static bool __read_mostly enable_apicv = 1;
module_param(enable_apicv, bool, S_IRUGO);

static bool __read_mostly enable_shadow_vmcs = 1;
module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO);
/*
 * If nested=1, nested virtualization is supported, i.e., guests may use
 * VMX and be a hypervisor for its own guests. If nested=0, guests may not
 * use VMX instructions.
 */
static bool __read_mostly nested = 0;
module_param(nested, bool, S_IRUGO);

static u64 __read_mostly host_xss;

static bool __read_mostly enable_pml = 1;
module_param_named(pml, enable_pml, bool, S_IRUGO);

#define KVM_VMX_TSC_MULTIPLIER_MAX     0xffffffffffffffffULL

/* Guest_tsc -> host_tsc conversion requires 64-bit division.  */
static int __read_mostly cpu_preemption_timer_multi;
static bool __read_mostly enable_preemption_timer = 1;
#ifdef CONFIG_X86_64
module_param_named(preemption_timer, enable_preemption_timer, bool, S_IRUGO);
#endif

#define KVM_GUEST_CR0_MASK (X86_CR0_NW | X86_CR0_CD)
#define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST (X86_CR0_WP | X86_CR0_NE)
#define KVM_VM_CR0_ALWAYS_ON						\
	(KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
#define KVM_CR4_GUEST_OWNED_BITS				      \
	(X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR      \
	 | X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_TSD)

#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)

#define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM))

#define VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE 5

/*
 * Hyper-V requires all of these, so mark them as supported even though
 * they are just treated the same as all-context.
 */
#define VMX_VPID_EXTENT_SUPPORTED_MASK		\
	(VMX_VPID_EXTENT_INDIVIDUAL_ADDR_BIT |	\
	VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT |	\
	VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT |	\
	VMX_VPID_EXTENT_SINGLE_NON_GLOBAL_BIT)

/*
 * 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 smaller than 128 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           128
#define KVM_VMX_DEFAULT_PLE_WINDOW        4096
#define KVM_VMX_DEFAULT_PLE_WINDOW_GROW   2
#define KVM_VMX_DEFAULT_PLE_WINDOW_SHRINK 0
#define KVM_VMX_DEFAULT_PLE_WINDOW_MAX    \
		INT_MAX / KVM_VMX_DEFAULT_PLE_WINDOW_GROW

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);

/* Default doubles per-vcpu window every exit. */
static int ple_window_grow = KVM_VMX_DEFAULT_PLE_WINDOW_GROW;
module_param(ple_window_grow, int, S_IRUGO);

/* Default resets per-vcpu window every exit to ple_window. */
static int ple_window_shrink = KVM_VMX_DEFAULT_PLE_WINDOW_SHRINK;
module_param(ple_window_shrink, int, S_IRUGO);

/* Default is to compute the maximum so we can never overflow. */
static int ple_window_actual_max = KVM_VMX_DEFAULT_PLE_WINDOW_MAX;
static int ple_window_max        = KVM_VMX_DEFAULT_PLE_WINDOW_MAX;
module_param(ple_window_max, int, S_IRUGO);

extern const ulong vmx_return;

#define NR_AUTOLOAD_MSRS 8
#define VMCS02_POOL_SIZE 1

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

/*
 * Track a VMCS that may be loaded on a certain CPU. If it is (cpu!=-1), also
 * remember whether it was VMLAUNCHed, and maintain a linked list of all VMCSs
 * loaded on this CPU (so we can clear them if the CPU goes down).
 */
struct loaded_vmcs {
	struct vmcs *vmcs;
	struct vmcs *shadow_vmcs;
	int cpu;
	bool launched;
	bool nmi_known_unmasked;
	unsigned long vmcs_host_cr3;	/* May not match real cr3 */
	unsigned long vmcs_host_cr4;	/* May not match real cr4 */
	struct list_head loaded_vmcss_on_cpu_link;
};

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

/*
 * struct vmcs12 describes the state that our guest hypervisor (L1) keeps for a
 * single nested guest (L2), hence the name vmcs12. Any VMX implementation has
 * a VMCS structure, and vmcs12 is our emulated VMX's VMCS. This structure is
 * stored in guest memory specified by VMPTRLD, but is opaque to the guest,
 * which must access it using VMREAD/VMWRITE/VMCLEAR instructions.
 * More than one of these structures may exist, if L1 runs multiple L2 guests.
 * nested_vmx_run() will use the data here to build a vmcs02: a VMCS for the
 * underlying hardware which will be used to run L2.
 * This structure is packed to ensure that its layout is identical across
 * machines (necessary for live migration).
 * If there are changes in this struct, VMCS12_REVISION must be changed.
 */
typedef u64 natural_width;
struct __packed vmcs12 {
	/* According to the Intel spec, a VMCS region must start with the
	 * following two fields. Then follow implementation-specific data.
	 */
	u32 revision_id;
	u32 abort;

	u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */
	u32 padding[7]; /* room for future expansion */

	u64 io_bitmap_a;
	u64 io_bitmap_b;
	u64 msr_bitmap;
	u64 vm_exit_msr_store_addr;
	u64 vm_exit_msr_load_addr;
	u64 vm_entry_msr_load_addr;
	u64 tsc_offset;
	u64 virtual_apic_page_addr;
	u64 apic_access_addr;
	u64 posted_intr_desc_addr;
	u64 vm_function_control;
	u64 ept_pointer;
	u64 eoi_exit_bitmap0;
	u64 eoi_exit_bitmap1;
	u64 eoi_exit_bitmap2;
	u64 eoi_exit_bitmap3;
	u64 eptp_list_address;
	u64 xss_exit_bitmap;
	u64 guest_physical_address;
	u64 vmcs_link_pointer;
	u64 pml_address;
	u64 guest_ia32_debugctl;
	u64 guest_ia32_pat;
	u64 guest_ia32_efer;
	u64 guest_ia32_perf_global_ctrl;
	u64 guest_pdptr0;
	u64 guest_pdptr1;
	u64 guest_pdptr2;
	u64 guest_pdptr3;
	u64 guest_bndcfgs;
	u64 host_ia32_pat;
	u64 host_ia32_efer;
	u64 host_ia32_perf_global_ctrl;
	u64 padding64[8]; /* room for future expansion */
	/*
	 * To allow migration of L1 (complete with its L2 guests) between
	 * machines of different natural widths (32 or 64 bit), we cannot have
	 * unsigned long fields with no explict size. We use u64 (aliased
	 * natural_width) instead. Luckily, x86 is little-endian.
	 */
	natural_width cr0_guest_host_mask;
	natural_width cr4_guest_host_mask;
	natural_width cr0_read_shadow;
	natural_width cr4_read_shadow;
	natural_width cr3_target_value0;
	natural_width cr3_target_value1;
	natural_width cr3_target_value2;
	natural_width cr3_target_value3;
	natural_width exit_qualification;
	natural_width guest_linear_address;
	natural_width guest_cr0;
	natural_width guest_cr3;
	natural_width guest_cr4;
	natural_width guest_es_base;
	natural_width guest_cs_base;
	natural_width guest_ss_base;
	natural_width guest_ds_base;
	natural_width guest_fs_base;
	natural_width guest_gs_base;
	natural_width guest_ldtr_base;
	natural_width guest_tr_base;
	natural_width guest_gdtr_base;
	natural_width guest_idtr_base;
	natural_width guest_dr7;
	natural_width guest_rsp;
	natural_width guest_rip;
	natural_width guest_rflags;
	natural_width guest_pending_dbg_exceptions;
	natural_width guest_sysenter_esp;
	natural_width guest_sysenter_eip;
	natural_width host_cr0;
	natural_width host_cr3;
	natural_width host_cr4;
	natural_width host_fs_base;
	natural_width host_gs_base;
	natural_width host_tr_base;
	natural_width host_gdtr_base;
	natural_width host_idtr_base;
	natural_width host_ia32_sysenter_esp;
	natural_width host_ia32_sysenter_eip;
	natural_width host_rsp;
	natural_width host_rip;
	natural_width paddingl[8]; /* room for future expansion */
	u32 pin_based_vm_exec_control;
	u32 cpu_based_vm_exec_control;
	u32 exception_bitmap;
	u32 page_fault_error_code_mask;
	u32 page_fault_error_code_match;
	u32 cr3_target_count;
	u32 vm_exit_controls;
	u32 vm_exit_msr_store_count;
	u32 vm_exit_msr_load_count;
	u32 vm_entry_controls;
	u32 vm_entry_msr_load_count;
	u32 vm_entry_intr_info_field;
	u32 vm_entry_exception_error_code;
	u32 vm_entry_instruction_len;
	u32 tpr_threshold;
	u32 secondary_vm_exec_control;
	u32 vm_instruction_error;
	u32 vm_exit_reason;
	u32 vm_exit_intr_info;
	u32 vm_exit_intr_error_code;
	u32 idt_vectoring_info_field;
	u32 idt_vectoring_error_code;
	u32 vm_exit_instruction_len;
	u32 vmx_instruction_info;
	u32 guest_es_limit;
	u32 guest_cs_limit;
	u32 guest_ss_limit;
	u32 guest_ds_limit;
	u32 guest_fs_limit;
	u32 guest_gs_limit;
	u32 guest_ldtr_limit;
	u32 guest_tr_limit;
	u32 guest_gdtr_limit;
	u32 guest_idtr_limit;
	u32 guest_es_ar_bytes;
	u32 guest_cs_ar_bytes;
	u32 guest_ss_ar_bytes;
	u32 guest_ds_ar_bytes;
	u32 guest_fs_ar_bytes;
	u32 guest_gs_ar_bytes;
	u32 guest_ldtr_ar_bytes;
	u32 guest_tr_ar_bytes;
	u32 guest_interruptibility_info;
	u32 guest_activity_state;
	u32 guest_sysenter_cs;
	u32 host_ia32_sysenter_cs;
	u32 vmx_preemption_timer_value;
	u32 padding32[7]; /* room for future expansion */
	u16 virtual_processor_id;
	u16 posted_intr_nv;
	u16 guest_es_selector;
	u16 guest_cs_selector;
	u16 guest_ss_selector;
	u16 guest_ds_selector;
	u16 guest_fs_selector;
	u16 guest_gs_selector;
	u16 guest_ldtr_selector;
	u16 guest_tr_selector;
	u16 guest_intr_status;
	u16 guest_pml_index;
	u16 host_es_selector;
	u16 host_cs_selector;
	u16 host_ss_selector;
	u16 host_ds_selector;
	u16 host_fs_selector;
	u16 host_gs_selector;
	u16 host_tr_selector;
};

/*
 * VMCS12_REVISION is an arbitrary id that should be changed if the content or
 * layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and
 * VMPTRLD verifies that the VMCS region that L1 is loading contains this id.
 */
#define VMCS12_REVISION 0x11e57ed0

/*
 * VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region
 * and any VMCS region. Although only sizeof(struct vmcs12) are used by the
 * current implementation, 4K are reserved to avoid future complications.
 */
#define VMCS12_SIZE 0x1000

/* Used to remember the last vmcs02 used for some recently used vmcs12s */
struct vmcs02_list {
	struct list_head list;
	gpa_t vmptr;
	struct loaded_vmcs vmcs02;
};

/*
 * The nested_vmx structure is part of vcpu_vmx, and holds information we need
 * for correct emulation of VMX (i.e., nested VMX) on this vcpu.
 */
struct nested_vmx {
	/* Has the level1 guest done vmxon? */
	bool vmxon;
	gpa_t vmxon_ptr;
	bool pml_full;

	/* The guest-physical address of the current VMCS L1 keeps for L2 */
	gpa_t current_vmptr;
	/*
	 * Cache of the guest's VMCS, existing outside of guest memory.
	 * Loaded from guest memory during VMPTRLD. Flushed to guest
	 * memory during VMCLEAR and VMPTRLD.
	 */
	struct vmcs12 *cached_vmcs12;
	/*
	 * Indicates if the shadow vmcs must be updated with the
	 * data hold by vmcs12
	 */
	bool sync_shadow_vmcs;

	/* vmcs02_list cache of VMCSs recently used to run L2 guests */
	struct list_head vmcs02_pool;
	int vmcs02_num;
	bool change_vmcs01_virtual_x2apic_mode;
	/* L2 must run next, and mustn't decide to exit to L1. */
	bool nested_run_pending;
	/*
	 * Guest pages referred to in vmcs02 with host-physical pointers, so
	 * we must keep them pinned while L2 runs.
	 */
	struct page *apic_access_page;
	struct page *virtual_apic_page;
	struct page *pi_desc_page;
	struct pi_desc *pi_desc;
	bool pi_pending;
	u16 posted_intr_nv;

	unsigned long *msr_bitmap;

	struct hrtimer preemption_timer;
	bool preemption_timer_expired;

	/* to migrate it to L2 if VM_ENTRY_LOAD_DEBUG_CONTROLS is off */
	u64 vmcs01_debugctl;

	u16 vpid02;
	u16 last_vpid;

	/*
	 * We only store the "true" versions of the VMX capability MSRs. We
	 * generate the "non-true" versions by setting the must-be-1 bits
	 * according to the SDM.
	 */
	u32 nested_vmx_procbased_ctls_low;
	u32 nested_vmx_procbased_ctls_high;
	u32 nested_vmx_secondary_ctls_low;
	u32 nested_vmx_secondary_ctls_high;
	u32 nested_vmx_pinbased_ctls_low;
	u32 nested_vmx_pinbased_ctls_high;
	u32 nested_vmx_exit_ctls_low;
	u32 nested_vmx_exit_ctls_high;
	u32 nested_vmx_entry_ctls_low;
	u32 nested_vmx_entry_ctls_high;
	u32 nested_vmx_misc_low;
	u32 nested_vmx_misc_high;
	u32 nested_vmx_ept_caps;
	u32 nested_vmx_vpid_caps;
	u64 nested_vmx_basic;
	u64 nested_vmx_cr0_fixed0;
	u64 nested_vmx_cr0_fixed1;
	u64 nested_vmx_cr4_fixed0;
	u64 nested_vmx_cr4_fixed1;
	u64 nested_vmx_vmcs_enum;
	u64 nested_vmx_vmfunc_controls;
};

#define POSTED_INTR_ON  0
#define POSTED_INTR_SN  1

/* Posted-Interrupt Descriptor */
struct pi_desc {
	u32 pir[8];     /* Posted interrupt requested */
	union {
		struct {
				/* bit 256 - Outstanding Notification */
			u16	on	: 1,
				/* bit 257 - Suppress Notification */
				sn	: 1,
				/* bit 271:258 - Reserved */
				rsvd_1	: 14;
				/* bit 279:272 - Notification Vector */
			u8	nv;
				/* bit 287:280 - Reserved */
			u8	rsvd_2;
				/* bit 319:288 - Notification Destination */
			u32	ndst;
		};
		u64 control;
	};
	u32 rsvd[6];
} __aligned(64);

static bool pi_test_and_set_on(struct pi_desc *pi_desc)
{
	return test_and_set_bit(POSTED_INTR_ON,
			(unsigned long *)&pi_desc->control);
}

static bool pi_test_and_clear_on(struct pi_desc *pi_desc)
{
	return test_and_clear_bit(POSTED_INTR_ON,
			(unsigned long *)&pi_desc->control);
}

static int pi_test_and_set_pir(int vector, struct pi_desc *pi_desc)
{
	return test_and_set_bit(vector, (unsigned long *)pi_desc->pir);
}

static inline void pi_clear_sn(struct pi_desc *pi_desc)
{
	return clear_bit(POSTED_INTR_SN,
			(unsigned long *)&pi_desc->control);
}

static inline void pi_set_sn(struct pi_desc *pi_desc)
{
	return set_bit(POSTED_INTR_SN,
			(unsigned long *)&pi_desc->control);
}

static inline void pi_clear_on(struct pi_desc *pi_desc)
{
	clear_bit(POSTED_INTR_ON,
  		  (unsigned long *)&pi_desc->control);
}

static inline int pi_test_on(struct pi_desc *pi_desc)
{
	return test_bit(POSTED_INTR_ON,
			(unsigned long *)&pi_desc->control);
}

static inline int pi_test_sn(struct pi_desc *pi_desc)
{
	return test_bit(POSTED_INTR_SN,
			(unsigned long *)&pi_desc->control);
}

struct vcpu_vmx {
	struct kvm_vcpu       vcpu;
	unsigned long         host_rsp;
	u8                    fail;
	u32                   exit_intr_info;
	u32                   idt_vectoring_info;
	ulong                 rflags;
	struct shared_msr_entry *guest_msrs;
	int                   nmsrs;
	int                   save_nmsrs;
	unsigned long	      host_idt_base;
#ifdef CONFIG_X86_64
	u64 		      msr_host_kernel_gs_base;
	u64 		      msr_guest_kernel_gs_base;
#endif
	u32 vm_entry_controls_shadow;
	u32 vm_exit_controls_shadow;
	u32 secondary_exec_control;

	/*
	 * loaded_vmcs points to the VMCS currently used in this vcpu. For a
	 * non-nested (L1) guest, it always points to vmcs01. For a nested
	 * guest (L2), it points to a different VMCS.
	 */
	struct loaded_vmcs    vmcs01;
	struct loaded_vmcs   *loaded_vmcs;
	bool                  __launched; /* temporary, used in vmx_vcpu_run */
	struct msr_autoload {
		unsigned nr;
		struct vmx_msr_entry guest[NR_AUTOLOAD_MSRS];
		struct vmx_msr_entry host[NR_AUTOLOAD_MSRS];
	} msr_autoload;
	struct {
		int           loaded;
		u16           fs_sel, gs_sel, ldt_sel;
#ifdef CONFIG_X86_64
		u16           ds_sel, es_sel;
#endif
		int           gs_ldt_reload_needed;
		int           fs_reload_needed;
		u64           msr_host_bndcfgs;
	} host_state;
	struct {
		int vm86_active;
		ulong save_rflags;
		struct kvm_segment segs[8];
	} rmode;
	struct {
		u32 bitmask; /* 4 bits per segment (1 bit per field) */
		struct kvm_save_segment {
			u16 selector;
			unsigned long base;
			u32 limit;
			u32 ar;
		} seg[8];
	} segment_cache;
	int vpid;
	bool emulation_required;

	u32 exit_reason;

	/* Posted interrupt descriptor */
	struct pi_desc pi_desc;

	/* Support for a guest hypervisor (nested VMX) */
	struct nested_vmx nested;

	/* Dynamic PLE window. */
	int ple_window;
	bool ple_window_dirty;

	/* Support for PML */
#define PML_ENTITY_NUM		512
	struct page *pml_pg;

	/* apic deadline value in host tsc */
	u64 hv_deadline_tsc;

	u64 current_tsc_ratio;

	u32 host_pkru;

	/*
	 * Only bits masked by msr_ia32_feature_control_valid_bits can be set in
	 * msr_ia32_feature_control. FEATURE_CONTROL_LOCKED is always included
	 * in msr_ia32_feature_control_valid_bits.
	 */
	u64 msr_ia32_feature_control;
	u64 msr_ia32_feature_control_valid_bits;
};

enum segment_cache_field {
	SEG_FIELD_SEL = 0,
	SEG_FIELD_BASE = 1,
	SEG_FIELD_LIMIT = 2,
	SEG_FIELD_AR = 3,

	SEG_FIELD_NR = 4
};

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

static struct pi_desc *vcpu_to_pi_desc(struct kvm_vcpu *vcpu)
{
	return &(to_vmx(vcpu)->pi_desc);
}

#define VMCS12_OFFSET(x) offsetof(struct vmcs12, x)
#define FIELD(number, name)	[number] = VMCS12_OFFSET(name)
#define FIELD64(number, name)	[number] = VMCS12_OFFSET(name), \
				[number##_HIGH] = VMCS12_OFFSET(name)+4


static unsigned long shadow_read_only_fields[] = {
	/*
	 * We do NOT shadow fields that are modified when L0
	 * traps and emulates any vmx instruction (e.g. VMPTRLD,
	 * VMXON...) executed by L1.
	 * For example, VM_INSTRUCTION_ERROR is read
	 * by L1 if a vmx instruction fails (part of the error path).
	 * Note the code assumes this logic. If for some reason
	 * we start shadowing these fields then we need to
	 * force a shadow sync when L0 emulates vmx instructions
	 * (e.g. force a sync if VM_INSTRUCTION_ERROR is modified
	 * by nested_vmx_failValid)
	 */
	VM_EXIT_REASON,
	VM_EXIT_INTR_INFO,
	VM_EXIT_INSTRUCTION_LEN,
	IDT_VECTORING_INFO_FIELD,
	IDT_VECTORING_ERROR_CODE,
	VM_EXIT_INTR_ERROR_CODE,
	EXIT_QUALIFICATION,
	GUEST_LINEAR_ADDRESS,
	GUEST_PHYSICAL_ADDRESS
};
static int max_shadow_read_only_fields =
	ARRAY_SIZE(shadow_read_only_fields);

static unsigned long shadow_read_write_fields[] = {
	TPR_THRESHOLD,
	GUEST_RIP,
	GUEST_RSP,
	GUEST_CR0,
	GUEST_CR3,
	GUEST_CR4,
	GUEST_INTERRUPTIBILITY_INFO,
	GUEST_RFLAGS,
	GUEST_CS_SELECTOR,
	GUEST_CS_AR_BYTES,
	GUEST_CS_LIMIT,
	GUEST_CS_BASE,
	GUEST_ES_BASE,
	GUEST_BNDCFGS,
	CR0_GUEST_HOST_MASK,
	CR0_READ_SHADOW,
	CR4_READ_SHADOW,
	TSC_OFFSET,
	EXCEPTION_BITMAP,
	CPU_BASED_VM_EXEC_CONTROL,
	VM_ENTRY_EXCEPTION_ERROR_CODE,
	VM_ENTRY_INTR_INFO_FIELD,
	VM_ENTRY_INSTRUCTION_LEN,
	VM_ENTRY_EXCEPTION_ERROR_CODE,
	HOST_FS_BASE,
	HOST_GS_BASE,
	HOST_FS_SELECTOR,
	HOST_GS_SELECTOR
};
static int max_shadow_read_write_fields =
	ARRAY_SIZE(shadow_read_write_fields);

static const unsigned short vmcs_field_to_offset_table[] = {
	FIELD(VIRTUAL_PROCESSOR_ID, virtual_processor_id),
	FIELD(POSTED_INTR_NV, posted_intr_nv),
	FIELD(GUEST_ES_SELECTOR, guest_es_selector),
	FIELD(GUEST_CS_SELECTOR, guest_cs_selector),
	FIELD(GUEST_SS_SELECTOR, guest_ss_selector),
	FIELD(GUEST_DS_SELECTOR, guest_ds_selector),
	FIELD(GUEST_FS_SELECTOR, guest_fs_selector),
	FIELD(GUEST_GS_SELECTOR, guest_gs_selector),
	FIELD(GUEST_LDTR_SELECTOR, guest_ldtr_selector),
	FIELD(GUEST_TR_SELECTOR, guest_tr_selector),
	FIELD(GUEST_INTR_STATUS, guest_intr_status),
	FIELD(GUEST_PML_INDEX, guest_pml_index),
	FIELD(HOST_ES_SELECTOR, host_es_selector),
	FIELD(HOST_CS_SELECTOR, host_cs_selector),
	FIELD(HOST_SS_SELECTOR, host_ss_selector),
	FIELD(HOST_DS_SELECTOR, host_ds_selector),
	FIELD(HOST_FS_SELECTOR, host_fs_selector),
	FIELD(HOST_GS_SELECTOR, host_gs_selector),
	FIELD(HOST_TR_SELECTOR, host_tr_selector),
	FIELD64(IO_BITMAP_A, io_bitmap_a),
	FIELD64(IO_BITMAP_B, io_bitmap_b),
	FIELD64(MSR_BITMAP, msr_bitmap),
	FIELD64(VM_EXIT_MSR_STORE_ADDR, vm_exit_msr_store_addr),
	FIELD64(VM_EXIT_MSR_LOAD_ADDR, vm_exit_msr_load_addr),
	FIELD64(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr),
	FIELD64(TSC_OFFSET, tsc_offset),
	FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr),
	FIELD64(APIC_ACCESS_ADDR, apic_access_addr),
	FIELD64(POSTED_INTR_DESC_ADDR, posted_intr_desc_addr),
	FIELD64(VM_FUNCTION_CONTROL, vm_function_control),
	FIELD64(EPT_POINTER, ept_pointer),
	FIELD64(EOI_EXIT_BITMAP0, eoi_exit_bitmap0),
	FIELD64(EOI_EXIT_BITMAP1, eoi_exit_bitmap1),
	FIELD64(EOI_EXIT_BITMAP2, eoi_exit_bitmap2),
	FIELD64(EOI_EXIT_BITMAP3, eoi_exit_bitmap3),
	FIELD64(EPTP_LIST_ADDRESS, eptp_list_address),
	FIELD64(XSS_EXIT_BITMAP, xss_exit_bitmap),
	FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address),
	FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer),
	FIELD64(PML_ADDRESS, pml_address),
	FIELD64(GUEST_IA32_DEBUGCTL, guest_ia32_debugctl),
	FIELD64(GUEST_IA32_PAT, guest_ia32_pat),
	FIELD64(GUEST_IA32_EFER, guest_ia32_efer),
	FIELD64(GUEST_IA32_PERF_GLOBAL_CTRL, guest_ia32_perf_global_ctrl),
	FIELD64(GUEST_PDPTR0, guest_pdptr0),
	FIELD64(GUEST_PDPTR1, guest_pdptr1),
	FIELD64(GUEST_PDPTR2, guest_pdptr2),
	FIELD64(GUEST_PDPTR3, guest_pdptr3),
	FIELD64(GUEST_BNDCFGS, guest_bndcfgs),
	FIELD64(HOST_IA32_PAT, host_ia32_pat),
	FIELD64(HOST_IA32_EFER, host_ia32_efer),
	FIELD64(HOST_IA32_PERF_GLOBAL_CTRL, host_ia32_perf_global_ctrl),
	FIELD(PIN_BASED_VM_EXEC_CONTROL, pin_based_vm_exec_control),
	FIELD(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control),
	FIELD(EXCEPTION_BITMAP, exception_bitmap),
	FIELD(PAGE_FAULT_ERROR_CODE_MASK, page_fault_error_code_mask),
	FIELD(PAGE_FAULT_ERROR_CODE_MATCH, page_fault_error_code_match),
	FIELD(CR3_TARGET_COUNT, cr3_target_count),
	FIELD(VM_EXIT_CONTROLS, vm_exit_controls),
	FIELD(VM_EXIT_MSR_STORE_COUNT, vm_exit_msr_store_count),
	FIELD(VM_EXIT_MSR_LOAD_COUNT, vm_exit_msr_load_count),
	FIELD(VM_ENTRY_CONTROLS, vm_entry_controls),
	FIELD(VM_ENTRY_MSR_LOAD_COUNT, vm_entry_msr_load_count),
	FIELD(VM_ENTRY_INTR_INFO_FIELD, vm_entry_intr_info_field),
	FIELD(VM_ENTRY_EXCEPTION_ERROR_CODE, vm_entry_exception_error_code),
	FIELD(VM_ENTRY_INSTRUCTION_LEN, vm_entry_instruction_len),
	FIELD(TPR_THRESHOLD, tpr_threshold),
	FIELD(SECONDARY_VM_EXEC_CONTROL, secondary_vm_exec_control),
	FIELD(VM_INSTRUCTION_ERROR, vm_instruction_error),
	FIELD(VM_EXIT_REASON, vm_exit_reason),
	FIELD(VM_EXIT_INTR_INFO, vm_exit_intr_info),
	FIELD(VM_EXIT_INTR_ERROR_CODE, vm_exit_intr_error_code),
	FIELD(IDT_VECTORING_INFO_FIELD, idt_vectoring_info_field),
	FIELD(IDT_VECTORING_ERROR_CODE, idt_vectoring_error_code),
	FIELD(VM_EXIT_INSTRUCTION_LEN, vm_exit_instruction_len),
	FIELD(VMX_INSTRUCTION_INFO, vmx_instruction_info),
	FIELD(GUEST_ES_LIMIT, guest_es_limit),
	FIELD(GUEST_CS_LIMIT, guest_cs_limit),
	FIELD(GUEST_SS_LIMIT, guest_ss_limit),
	FIELD(GUEST_DS_LIMIT, guest_ds_limit),
	FIELD(GUEST_FS_LIMIT, guest_fs_limit),
	FIELD(GUEST_GS_LIMIT, guest_gs_limit),
	FIELD(GUEST_LDTR_LIMIT, guest_ldtr_limit),
	FIELD(GUEST_TR_LIMIT, guest_tr_limit),
	FIELD(GUEST_GDTR_LIMIT, guest_gdtr_limit),
	FIELD(GUEST_IDTR_LIMIT, guest_idtr_limit),
	FIELD(GUEST_ES_AR_BYTES, guest_es_ar_bytes),
	FIELD(GUEST_CS_AR_BYTES, guest_cs_ar_bytes),
	FIELD(GUEST_SS_AR_BYTES, guest_ss_ar_bytes),
	FIELD(GUEST_DS_AR_BYTES, guest_ds_ar_bytes),
	FIELD(GUEST_FS_AR_BYTES, guest_fs_ar_bytes),
	FIELD(GUEST_GS_AR_BYTES, guest_gs_ar_bytes),
	FIELD(GUEST_LDTR_AR_BYTES, guest_ldtr_ar_bytes),
	FIELD(GUEST_TR_AR_BYTES, guest_tr_ar_bytes),
	FIELD(GUEST_INTERRUPTIBILITY_INFO, guest_interruptibility_info),
	FIELD(GUEST_ACTIVITY_STATE, guest_activity_state),
	FIELD(GUEST_SYSENTER_CS, guest_sysenter_cs),
	FIELD(HOST_IA32_SYSENTER_CS, host_ia32_sysenter_cs),
	FIELD(VMX_PREEMPTION_TIMER_VALUE, vmx_preemption_timer_value),
	FIELD(CR0_GUEST_HOST_MASK, cr0_guest_host_mask),
	FIELD(CR4_GUEST_HOST_MASK, cr4_guest_host_mask),
	FIELD(CR0_READ_SHADOW, cr0_read_shadow),
	FIELD(CR4_READ_SHADOW, cr4_read_shadow),
	FIELD(CR3_TARGET_VALUE0, cr3_target_value0),
	FIELD(CR3_TARGET_VALUE1, cr3_target_value1),
	FIELD(CR3_TARGET_VALUE2, cr3_target_value2),
	FIELD(CR3_TARGET_VALUE3, cr3_target_value3),
	FIELD(EXIT_QUALIFICATION, exit_qualification),
	FIELD(GUEST_LINEAR_ADDRESS, guest_linear_address),
	FIELD(GUEST_CR0, guest_cr0),
	FIELD(GUEST_CR3, guest_cr3),
	FIELD(GUEST_CR4, guest_cr4),
	FIELD(GUEST_ES_BASE, guest_es_base),
	FIELD(GUEST_CS_BASE, guest_cs_base),
	FIELD(GUEST_SS_BASE, guest_ss_base),
	FIELD(GUEST_DS_BASE, guest_ds_base),
	FIELD(GUEST_FS_BASE, guest_fs_base),
	FIELD(GUEST_GS_BASE, guest_gs_base),
	FIELD(GUEST_LDTR_BASE, guest_ldtr_base),
	FIELD(GUEST_TR_BASE, guest_tr_base),
	FIELD(GUEST_GDTR_BASE, guest_gdtr_base),
	FIELD(GUEST_IDTR_BASE, guest_idtr_base),
	FIELD(GUEST_DR7, guest_dr7),
	FIELD(GUEST_RSP, guest_rsp),
	FIELD(GUEST_RIP, guest_rip),
	FIELD(GUEST_RFLAGS, guest_rflags),
	FIELD(GUEST_PENDING_DBG_EXCEPTIONS, guest_pending_dbg_exceptions),
	FIELD(GUEST_SYSENTER_ESP, guest_sysenter_esp),
	FIELD(GUEST_SYSENTER_EIP, guest_sysenter_eip),
	FIELD(HOST_CR0, host_cr0),
	FIELD(HOST_CR3, host_cr3),
	FIELD(HOST_CR4, host_cr4),
	FIELD(HOST_FS_BASE, host_fs_base),
	FIELD(HOST_GS_BASE, host_gs_base),
	FIELD(HOST_TR_BASE, host_tr_base),
	FIELD(HOST_GDTR_BASE, host_gdtr_base),
	FIELD(HOST_IDTR_BASE, host_idtr_base),
	FIELD(HOST_IA32_SYSENTER_ESP, host_ia32_sysenter_esp),
	FIELD(HOST_IA32_SYSENTER_EIP, host_ia32_sysenter_eip),
	FIELD(HOST_RSP, host_rsp),
	FIELD(HOST_RIP, host_rip),
};

static inline short vmcs_field_to_offset(unsigned long field)
{
	BUILD_BUG_ON(ARRAY_SIZE(vmcs_field_to_offset_table) > SHRT_MAX);

	if (field >= ARRAY_SIZE(vmcs_field_to_offset_table) ||
	    vmcs_field_to_offset_table[field] == 0)
		return -ENOENT;

	return vmcs_field_to_offset_table[field];
}

static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu)
{
	return to_vmx(vcpu)->nested.cached_vmcs12;
}

static bool nested_ept_ad_enabled(struct kvm_vcpu *vcpu);
static unsigned long nested_ept_get_cr3(struct kvm_vcpu *vcpu);
static u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa);
static bool vmx_xsaves_supported(void);
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr);
static void vmx_set_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg);
static void vmx_get_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg);
static bool guest_state_valid(struct kvm_vcpu *vcpu);
static u32 vmx_segment_access_rights(struct kvm_segment *var);
static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx);
static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx);
static int alloc_identity_pagetable(struct kvm *kvm);
static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu);
static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked);
static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12,
					    u16 error_code);

static DEFINE_PER_CPU(struct vmcs *, vmxarea);
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
/*
 * We maintain a per-CPU linked-list of VMCS loaded on that CPU. This is needed
 * when a CPU is brought down, and we need to VMCLEAR all VMCSs loaded on it.
 */
static DEFINE_PER_CPU(struct list_head, loaded_vmcss_on_cpu);

/*
 * We maintian a per-CPU linked-list of vCPU, so in wakeup_handler() we
 * can find which vCPU should be waken up.
 */
static DEFINE_PER_CPU(struct list_head, blocked_vcpu_on_cpu);
static DEFINE_PER_CPU(spinlock_t, blocked_vcpu_on_cpu_lock);

enum {
	VMX_IO_BITMAP_A,
	VMX_IO_BITMAP_B,
	VMX_MSR_BITMAP_LEGACY,
	VMX_MSR_BITMAP_LONGMODE,
	VMX_MSR_BITMAP_LEGACY_X2APIC_APICV,
	VMX_MSR_BITMAP_LONGMODE_X2APIC_APICV,
	VMX_MSR_BITMAP_LEGACY_X2APIC,
	VMX_MSR_BITMAP_LONGMODE_X2APIC,
	VMX_VMREAD_BITMAP,
	VMX_VMWRITE_BITMAP,
	VMX_BITMAP_NR
};

static unsigned long *vmx_bitmap[VMX_BITMAP_NR];

#define vmx_io_bitmap_a                      (vmx_bitmap[VMX_IO_BITMAP_A])
#define vmx_io_bitmap_b                      (vmx_bitmap[VMX_IO_BITMAP_B])
#define vmx_msr_bitmap_legacy                (vmx_bitmap[VMX_MSR_BITMAP_LEGACY])
#define vmx_msr_bitmap_longmode              (vmx_bitmap[VMX_MSR_BITMAP_LONGMODE])
#define vmx_msr_bitmap_legacy_x2apic_apicv   (vmx_bitmap[VMX_MSR_BITMAP_LEGACY_X2APIC_APICV])
#define vmx_msr_bitmap_longmode_x2apic_apicv (vmx_bitmap[VMX_MSR_BITMAP_LONGMODE_X2APIC_APICV])
#define vmx_msr_bitmap_legacy_x2apic         (vmx_bitmap[VMX_MSR_BITMAP_LEGACY_X2APIC])
#define vmx_msr_bitmap_longmode_x2apic       (vmx_bitmap[VMX_MSR_BITMAP_LONGMODE_X2APIC])
#define vmx_vmread_bitmap                    (vmx_bitmap[VMX_VMREAD_BITMAP])
#define vmx_vmwrite_bitmap                   (vmx_bitmap[VMX_VMWRITE_BITMAP])

static bool cpu_has_load_ia32_efer;
static bool cpu_has_load_perf_global_ctrl;

static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
static DEFINE_SPINLOCK(vmx_vpid_lock);

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

static struct vmx_capability {
	u32 ept;
	u32 vpid;
} vmx_capability;

#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 const 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),
};

static u64 host_efer;

static void ept_save_pdptrs(struct kvm_vcpu *vcpu);

/*
 * Keep MSR_STAR at the end, as setup_msrs() will try to optimize it
 * away by decrementing the array size.
 */
static const u32 vmx_msr_index[] = {
#ifdef CONFIG_X86_64
	MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR,
#endif
	MSR_EFER, MSR_TSC_AUX, MSR_STAR,
};

static inline bool is_exception_n(u32 intr_info, u8 vector)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
			     INTR_INFO_VALID_MASK)) ==
		(INTR_TYPE_HARD_EXCEPTION | vector | INTR_INFO_VALID_MASK);
}

static inline bool is_debug(u32 intr_info)
{
	return is_exception_n(intr_info, DB_VECTOR);
}

static inline bool is_breakpoint(u32 intr_info)
{
	return is_exception_n(intr_info, BP_VECTOR);
}

static inline bool is_page_fault(u32 intr_info)
{
	return is_exception_n(intr_info, PF_VECTOR);
}

static inline bool is_no_device(u32 intr_info)
{
	return is_exception_n(intr_info, NM_VECTOR);
}

static inline bool is_invalid_opcode(u32 intr_info)
{
	return is_exception_n(intr_info, UD_VECTOR);
}

static inline bool 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);
}

static inline bool 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);
}

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

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

static inline bool cpu_need_tpr_shadow(struct kvm_vcpu *vcpu)
{
	return cpu_has_vmx_tpr_shadow() && lapic_in_kernel(vcpu);
}

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

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

static inline bool cpu_has_vmx_virtualize_x2apic_mode(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE;
}

static inline bool cpu_has_vmx_apic_register_virt(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_APIC_REGISTER_VIRT;
}

static inline bool cpu_has_vmx_virtual_intr_delivery(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY;
}

/*
 * Comment's format: document - errata name - stepping - processor name.
 * Refer from
 * https://www.virtualbox.org/svn/vbox/trunk/src/VBox/VMM/VMMR0/HMR0.cpp
 */
static u32 vmx_preemption_cpu_tfms[] = {
/* 323344.pdf - BA86   - D0 - Xeon 7500 Series */
0x000206E6,
/* 323056.pdf - AAX65  - C2 - Xeon L3406 */
/* 322814.pdf - AAT59  - C2 - i7-600, i5-500, i5-400 and i3-300 Mobile */
/* 322911.pdf - AAU65  - C2 - i5-600, i3-500 Desktop and Pentium G6950 */
0x00020652,
/* 322911.pdf - AAU65  - K0 - i5-600, i3-500 Desktop and Pentium G6950 */
0x00020655,
/* 322373.pdf - AAO95  - B1 - Xeon 3400 Series */
/* 322166.pdf - AAN92  - B1 - i7-800 and i5-700 Desktop */
/*
 * 320767.pdf - AAP86  - B1 -
 * i7-900 Mobile Extreme, i7-800 and i7-700 Mobile
 */
0x000106E5,
/* 321333.pdf - AAM126 - C0 - Xeon 3500 */
0x000106A0,
/* 321333.pdf - AAM126 - C1 - Xeon 3500 */
0x000106A1,
/* 320836.pdf - AAJ124 - C0 - i7-900 Desktop Extreme and i7-900 Desktop */
0x000106A4,
 /* 321333.pdf - AAM126 - D0 - Xeon 3500 */
 /* 321324.pdf - AAK139 - D0 - Xeon 5500 */
 /* 320836.pdf - AAJ124 - D0 - i7-900 Extreme and i7-900 Desktop */
0x000106A5,
};

static inline bool cpu_has_broken_vmx_preemption_timer(void)
{
	u32 eax = cpuid_eax(0x00000001), i;

	/* Clear the reserved bits */
	eax &= ~(0x3U << 14 | 0xfU << 28);
	for (i = 0; i < ARRAY_SIZE(vmx_preemption_cpu_tfms); i++)
		if (eax == vmx_preemption_cpu_tfms[i])
			return true;

	return false;
}

static inline bool cpu_has_vmx_preemption_timer(void)
{
	return vmcs_config.pin_based_exec_ctrl &
		PIN_BASED_VMX_PREEMPTION_TIMER;
}

static inline bool cpu_has_vmx_posted_intr(void)
{
	return IS_ENABLED(CONFIG_X86_LOCAL_APIC) &&
		vmcs_config.pin_based_exec_ctrl & PIN_BASED_POSTED_INTR;
}

static inline bool cpu_has_vmx_apicv(void)
{
	return cpu_has_vmx_apic_register_virt() &&
		cpu_has_vmx_virtual_intr_delivery() &&
		cpu_has_vmx_posted_intr();
}

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

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_ept_2m_page(void)
{
	return vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT;
}

static inline bool cpu_has_vmx_ept_1g_page(void)
{
	return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT;
}

static inline bool cpu_has_vmx_ept_4levels(void)
{
	return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT;
}

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

static inline bool cpu_has_vmx_ept_5levels(void)
{
	return vmx_capability.ept & VMX_EPT_PAGE_WALK_5_BIT;
}

static inline bool cpu_has_vmx_ept_ad_bits(void)
{
	return vmx_capability.ept & VMX_EPT_AD_BIT;
}

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

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

static inline bool cpu_has_vmx_invvpid_single(void)
{
	return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT;
}

static inline bool cpu_has_vmx_invvpid_global(void)
{
	return vmx_capability.vpid & VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT;
}

static inline bool cpu_has_vmx_invvpid(void)
{
	return vmx_capability.vpid & VMX_VPID_INVVPID_BIT;
}

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

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

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

static inline bool cpu_has_vmx_basic_inout(void)
{
	return	(((u64)vmcs_config.basic_cap << 32) & VMX_BASIC_INOUT);
}

static inline bool cpu_need_virtualize_apic_accesses(struct kvm_vcpu *vcpu)
{
	return flexpriority_enabled && lapic_in_kernel(vcpu);
}

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

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

static inline bool cpu_has_vmx_invpcid(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_ENABLE_INVPCID;
}

static inline bool cpu_has_vmx_wbinvd_exit(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_WBINVD_EXITING;
}

static inline bool cpu_has_vmx_shadow_vmcs(void)
{
	u64 vmx_msr;
	rdmsrl(MSR_IA32_VMX_MISC, vmx_msr);
	/* check if the cpu supports writing r/o exit information fields */
	if (!(vmx_msr & MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS))
		return false;

	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_SHADOW_VMCS;
}

static inline bool cpu_has_vmx_pml(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl & SECONDARY_EXEC_ENABLE_PML;
}

static inline bool cpu_has_vmx_tsc_scaling(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_TSC_SCALING;
}

static inline bool cpu_has_vmx_vmfunc(void)
{
	return vmcs_config.cpu_based_2nd_exec_ctrl &
		SECONDARY_EXEC_ENABLE_VMFUNC;
}

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

static inline unsigned nested_cpu_vmx_misc_cr3_count(struct kvm_vcpu *vcpu)
{
	return vmx_misc_cr3_count(to_vmx(vcpu)->nested.nested_vmx_misc_low);
}

static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit)
{
	return vmcs12->cpu_based_vm_exec_control & bit;
}

static inline bool nested_cpu_has2(struct vmcs12 *vmcs12, u32 bit)
{
	return (vmcs12->cpu_based_vm_exec_control &
			CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) &&
		(vmcs12->secondary_vm_exec_control & bit);
}

static inline bool nested_cpu_has_virtual_nmis(struct vmcs12 *vmcs12)
{
	return vmcs12->pin_based_vm_exec_control & PIN_BASED_VIRTUAL_NMIS;
}

static inline bool nested_cpu_has_preemption_timer(struct vmcs12 *vmcs12)
{
	return vmcs12->pin_based_vm_exec_control &
		PIN_BASED_VMX_PREEMPTION_TIMER;
}

static inline int nested_cpu_has_ept(struct vmcs12 *vmcs12)
{
	return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_EPT);
}

static inline bool nested_cpu_has_xsaves(struct vmcs12 *vmcs12)
{
	return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES);
}

static inline bool nested_cpu_has_pml(struct vmcs12 *vmcs12)
{
	return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_PML);
}

static inline bool nested_cpu_has_virt_x2apic_mode(struct vmcs12 *vmcs12)
{
	return nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE);
}

static inline bool nested_cpu_has_vpid(struct vmcs12 *vmcs12)
{
	return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_VPID);
}

static inline bool nested_cpu_has_apic_reg_virt(struct vmcs12 *vmcs12)
{
	return nested_cpu_has2(vmcs12, SECONDARY_EXEC_APIC_REGISTER_VIRT);
}

static inline bool nested_cpu_has_vid(struct vmcs12 *vmcs12)
{
	return nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY);
}

static inline bool nested_cpu_has_posted_intr(struct vmcs12 *vmcs12)
{
	return vmcs12->pin_based_vm_exec_control & PIN_BASED_POSTED_INTR;
}

static inline bool nested_cpu_has_vmfunc(struct vmcs12 *vmcs12)
{
	return nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_VMFUNC);
}

static inline bool nested_cpu_has_eptp_switching(struct vmcs12 *vmcs12)
{
	return nested_cpu_has_vmfunc(vmcs12) &&
		(vmcs12->vm_function_control &
		 VMX_VMFUNC_EPTP_SWITCHING);
}

static inline bool is_nmi(u32 intr_info)
{
	return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
		== (INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK);
}

static void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason,
			      u32 exit_intr_info,
			      unsigned long exit_qualification);
static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu,
			struct vmcs12 *vmcs12,
			u32 reason, unsigned long qualification);

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

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

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

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

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

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

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

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

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

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

static inline void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs)
{
	vmcs_clear(loaded_vmcs->vmcs);
	if (loaded_vmcs->shadow_vmcs && loaded_vmcs->launched)
		vmcs_clear(loaded_vmcs->shadow_vmcs);
	loaded_vmcs->cpu = -1;
	loaded_vmcs->launched = 0;
}

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

	asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
			: "=qm"(error) : "a"(&phys_addr), "m"(phys_addr)
			: "cc", "memory");
	if (error)
		printk(KERN_ERR "kvm: vmptrld %p/%llx failed\n",
		       vmcs, phys_addr);
}

#ifdef CONFIG_KEXEC_CORE
/*
 * This bitmap is used to indicate whether the vmclear
 * operation is enabled on all cpus. All disabled by
 * default.
 */
static cpumask_t crash_vmclear_enabled_bitmap = CPU_MASK_NONE;

static inline void crash_enable_local_vmclear(int cpu)
{
	cpumask_set_cpu(cpu, &crash_vmclear_enabled_bitmap);
}

static inline void crash_disable_local_vmclear(int cpu)
{
	cpumask_clear_cpu(cpu, &crash_vmclear_enabled_bitmap);
}

static inline int crash_local_vmclear_enabled(int cpu)
{
	return cpumask_test_cpu(cpu, &crash_vmclear_enabled_bitmap);
}

static void crash_vmclear_local_loaded_vmcss(void)
{
	int cpu = raw_smp_processor_id();
	struct loaded_vmcs *v;

	if (!crash_local_vmclear_enabled(cpu))
		return;

	list_for_each_entry(v, &per_cpu(loaded_vmcss_on_cpu, cpu),
			    loaded_vmcss_on_cpu_link)
		vmcs_clear(v->vmcs);
}
#else
static inline void crash_enable_local_vmclear(int cpu) { }
static inline void crash_disable_local_vmclear(int cpu) { }
#endif /* CONFIG_KEXEC_CORE */

static void __loaded_vmcs_clear(void *arg)
{
	struct loaded_vmcs *loaded_vmcs = arg;
	int cpu = raw_smp_processor_id();

	if (loaded_vmcs->cpu != cpu)
		return; /* vcpu migration can race with cpu offline */
	if (per_cpu(current_vmcs, cpu) == loaded_vmcs->vmcs)
		per_cpu(current_vmcs, cpu) = NULL;
	crash_disable_local_vmclear(cpu);
	list_del(&loaded_vmcs->loaded_vmcss_on_cpu_link);

	/*
	 * we should ensure updating loaded_vmcs->loaded_vmcss_on_cpu_link
	 * is before setting loaded_vmcs->vcpu to -1 which is done in
	 * loaded_vmcs_init. Otherwise, other cpu can see vcpu = -1 fist
	 * then adds the vmcs into percpu list before it is deleted.
	 */
	smp_wmb();

	loaded_vmcs_init(loaded_vmcs);
	crash_enable_local_vmclear(cpu);
}

static void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs)
{
	int cpu = loaded_vmcs->cpu;

	if (cpu != -1)
		smp_call_function_single(cpu,
			 __loaded_vmcs_clear, loaded_vmcs, 1);
}

static inline void vpid_sync_vcpu_single(int vpid)
{
	if (vpid == 0)
		return;

	if (cpu_has_vmx_invvpid_single())
		__invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
}

static inline void vpid_sync_vcpu_global(void)
{
	if (cpu_has_vmx_invvpid_global())
		__invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
}

static inline void vpid_sync_context(int vpid)
{
	if (cpu_has_vmx_invvpid_single())
		vpid_sync_vcpu_single(vpid);
	else
		vpid_sync_vcpu_global();
}

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

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

static __always_inline void vmcs_check16(unsigned long field)
{
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
			 "16-bit accessor invalid for 64-bit field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
			 "16-bit accessor invalid for 64-bit high field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
			 "16-bit accessor invalid for 32-bit high field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
			 "16-bit accessor invalid for natural width field");
}

static __always_inline void vmcs_check32(unsigned long field)
{
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
			 "32-bit accessor invalid for 16-bit field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
			 "32-bit accessor invalid for natural width field");
}

static __always_inline void vmcs_check64(unsigned long field)
{
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
			 "64-bit accessor invalid for 16-bit field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
			 "64-bit accessor invalid for 64-bit high field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
			 "64-bit accessor invalid for 32-bit field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
			 "64-bit accessor invalid for natural width field");
}

static __always_inline void vmcs_checkl(unsigned long field)
{
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
			 "Natural width accessor invalid for 16-bit field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
			 "Natural width accessor invalid for 64-bit field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
			 "Natural width accessor invalid for 64-bit high field");
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
			 "Natural width accessor invalid for 32-bit field");
}

static __always_inline unsigned long __vmcs_readl(unsigned long field)
{
	unsigned long value;

	asm volatile (__ex_clear(ASM_VMX_VMREAD_RDX_RAX, "%0")
		      : "=a"(value) : "d"(field) : "cc");
	return value;
}

static __always_inline u16 vmcs_read16(unsigned long field)
{
	vmcs_check16(field);
	return __vmcs_readl(field);
}

static __always_inline u32 vmcs_read32(unsigned long field)
{
	vmcs_check32(field);
	return __vmcs_readl(field);
}

static __always_inline u64 vmcs_read64(unsigned long field)
{
	vmcs_check64(field);
#ifdef CONFIG_X86_64
	return __vmcs_readl(field);
#else
	return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
#endif
}

static __always_inline unsigned long vmcs_readl(unsigned long field)
{
	vmcs_checkl(field);
	return __vmcs_readl(field);
}

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();
}

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

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

static __always_inline void vmcs_write16(unsigned long field, u16 value)
{
	vmcs_check16(field);
	__vmcs_writel(field, value);
}

static __always_inline void vmcs_write32(unsigned long field, u32 value)
{
	vmcs_check32(field);
	__vmcs_writel(field, value);
}

static __always_inline void vmcs_write64(unsigned long field, u64 value)
{
	vmcs_check64(field);
	__vmcs_writel(field, value);
#ifndef CONFIG_X86_64
	asm volatile ("");
	__vmcs_writel(field+1, value >> 32);
#endif
}

static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
{
	vmcs_checkl(field);
	__vmcs_writel(field, value);
}

static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
{
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
			 "vmcs_clear_bits does not support 64-bit fields");
	__vmcs_writel(field, __vmcs_readl(field) & ~mask);
}

static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
{
        BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
			 "vmcs_set_bits does not support 64-bit fields");
	__vmcs_writel(field, __vmcs_readl(field) | mask);
}

static inline void vm_entry_controls_reset_shadow(struct vcpu_vmx *vmx)
{
	vmx->vm_entry_controls_shadow = vmcs_read32(VM_ENTRY_CONTROLS);
}

static inline void vm_entry_controls_init(struct vcpu_vmx *vmx, u32 val)
{
	vmcs_write32(VM_ENTRY_CONTROLS, val);
	vmx->vm_entry_controls_shadow = val;
}

static inline void vm_entry_controls_set(struct vcpu_vmx *vmx, u32 val)
{
	if (vmx->vm_entry_controls_shadow != val)
		vm_entry_controls_init(vmx, val);
}

static inline u32 vm_entry_controls_get(struct vcpu_vmx *vmx)
{
	return vmx->vm_entry_controls_shadow;
}


static inline void vm_entry_controls_setbit(struct vcpu_vmx *vmx, u32 val)
{
	vm_entry_controls_set(vmx, vm_entry_controls_get(vmx) | val);
}

static inline void vm_entry_controls_clearbit(struct vcpu_vmx *vmx, u32 val)
{
	vm_entry_controls_set(vmx, vm_entry_controls_get(vmx) & ~val);
}

static inline void vm_exit_controls_reset_shadow(struct vcpu_vmx *vmx)
{
	vmx->vm_exit_controls_shadow = vmcs_read32(VM_EXIT_CONTROLS);
}

static inline void vm_exit_controls_init(struct vcpu_vmx *vmx, u32 val)
{
	vmcs_write32(VM_EXIT_CONTROLS, val);
	vmx->vm_exit_controls_shadow = val;
}

static inline void vm_exit_controls_set(struct vcpu_vmx *vmx, u32 val)
{
	if (vmx->vm_exit_controls_shadow != val)
		vm_exit_controls_init(vmx, val);
}

static inline u32 vm_exit_controls_get(struct vcpu_vmx *vmx)
{
	return vmx->vm_exit_controls_shadow;
}


static inline void vm_exit_controls_setbit(struct vcpu_vmx *vmx, u32 val)
{
	vm_exit_controls_set(vmx, vm_exit_controls_get(vmx) | val);
}

static inline void vm_exit_controls_clearbit(struct vcpu_vmx *vmx, u32 val)
{
	vm_exit_controls_set(vmx, vm_exit_controls_get(vmx) & ~val);
}

static void vmx_segment_cache_clear(struct vcpu_vmx *vmx)
{
	vmx->segment_cache.bitmask = 0;
}

static bool vmx_segment_cache_test_set(struct vcpu_vmx *vmx, unsigned seg,
				       unsigned field)
{
	bool ret;
	u32 mask = 1 << (seg * SEG_FIELD_NR + field);

	if (!(vmx->vcpu.arch.regs_avail & (1 << VCPU_EXREG_SEGMENTS))) {
		vmx->vcpu.arch.regs_avail |= (1 << VCPU_EXREG_SEGMENTS);
		vmx->segment_cache.bitmask = 0;
	}
	ret = vmx->segment_cache.bitmask & mask;
	vmx->segment_cache.bitmask |= mask;
	return ret;
}

static u16 vmx_read_guest_seg_selector(struct vcpu_vmx *vmx, unsigned seg)
{
	u16 *p = &vmx->segment_cache.seg[seg].selector;

	if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_SEL))
		*p = vmcs_read16(kvm_vmx_segment_fields[seg].selector);
	return *p;
}

static ulong vmx_read_guest_seg_base(struct vcpu_vmx *vmx, unsigned seg)
{
	ulong *p = &vmx->segment_cache.seg[seg].base;

	if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_BASE))
		*p = vmcs_readl(kvm_vmx_segment_fields[seg].base);
	return *p;
}

static u32 vmx_read_guest_seg_limit(struct vcpu_vmx *vmx, unsigned seg)
{
	u32 *p = &vmx->segment_cache.seg[seg].limit;

	if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_LIMIT))
		*p = vmcs_read32(kvm_vmx_segment_fields[seg].limit);
	return *p;
}

static u32 vmx_read_guest_seg_ar(struct vcpu_vmx *vmx, unsigned seg)
{
	u32 *p = &vmx->segment_cache.seg[seg].ar;

	if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_AR))
		*p = vmcs_read32(kvm_vmx_segment_fields[seg].ar_bytes);
	return *p;
}

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

	eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) |
	     (1u << DB_VECTOR) | (1u << AC_VECTOR);
	if ((vcpu->guest_debug &
	     (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) ==
	    (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP))
		eb |= 1u << BP_VECTOR;
	if (to_vmx(vcpu)->rmode.vm86_active)
		eb = ~0;
	if (enable_ept)
		eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */

	/* When we are running a nested L2 guest and L1 specified for it a
	 * certain exception bitmap, we must trap the same exceptions and pass
	 * them to L1. When running L2, we will only handle the exceptions
	 * specified above if L1 did not want them.
	 */
	if (is_guest_mode(vcpu))
		eb |= get_vmcs12(vcpu)->exception_bitmap;

	vmcs_write32(EXCEPTION_BITMAP, eb);
}

static void clear_atomic_switch_msr_special(struct vcpu_vmx *vmx,
		unsigned long entry, unsigned long exit)
{
	vm_entry_controls_clearbit(vmx, entry);
	vm_exit_controls_clearbit(vmx, exit);
}

static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr)
{
	unsigned i;
	struct msr_autoload *m = &vmx->msr_autoload;

	switch (msr) {
	case MSR_EFER:
		if (cpu_has_load_ia32_efer) {
			clear_atomic_switch_msr_special(vmx,
					VM_ENTRY_LOAD_IA32_EFER,
					VM_EXIT_LOAD_IA32_EFER);
			return;
		}
		break;
	case MSR_CORE_PERF_GLOBAL_CTRL:
		if (cpu_has_load_perf_global_ctrl) {
			clear_atomic_switch_msr_special(vmx,
					VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL,
					VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL);
			return;
		}
		break;
	}

	for (i = 0; i < m->nr; ++i)
		if (m->guest[i].index == msr)
			break;

	if (i == m->nr)
		return;
	--m->nr;
	m->guest[i] = m->guest[m->nr];
	m->host[i] = m->host[m->nr];
	vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
	vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
}

static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx,
		unsigned long entry, unsigned long exit,
		unsigned long guest_val_vmcs, unsigned long host_val_vmcs,
		u64 guest_val, u64 host_val)
{
	vmcs_write64(guest_val_vmcs, guest_val);
	vmcs_write64(host_val_vmcs, host_val);
	vm_entry_controls_setbit(vmx, entry);
	vm_exit_controls_setbit(vmx, exit);
}

static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
				  u64 guest_val, u64 host_val)
{
	unsigned i;
	struct msr_autoload *m = &vmx->msr_autoload;

	switch (msr) {
	case MSR_EFER:
		if (cpu_has_load_ia32_efer) {
			add_atomic_switch_msr_special(vmx,
					VM_ENTRY_LOAD_IA32_EFER,
					VM_EXIT_LOAD_IA32_EFER,
					GUEST_IA32_EFER,
					HOST_IA32_EFER,
					guest_val, host_val);
			return;
		}
		break;
	case MSR_CORE_PERF_GLOBAL_CTRL:
		if (cpu_has_load_perf_global_ctrl) {
			add_atomic_switch_msr_special(vmx,
					VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL,
					VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL,
					GUEST_IA32_PERF_GLOBAL_CTRL,
					HOST_IA32_PERF_GLOBAL_CTRL,
					guest_val, host_val);
			return;
		}
		break;
	case MSR_IA32_PEBS_ENABLE:
		/* PEBS needs a quiescent period after being disabled (to write
		 * a record).  Disabling PEBS through VMX MSR swapping doesn't
		 * provide that period, so a CPU could write host's record into
		 * guest's memory.
		 */
		wrmsrl(MSR_IA32_PEBS_ENABLE, 0);
	}

	for (i = 0; i < m->nr; ++i)
		if (m->guest[i].index == msr)
			break;

	if (i == NR_AUTOLOAD_MSRS) {
		printk_once(KERN_WARNING "Not enough msr switch entries. "
				"Can't add msr %x\n", msr);
		return;
	} else if (i == m->nr) {
		++m->nr;
		vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
		vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
	}

	m->guest[i].index = msr;
	m->guest[i].value = guest_val;
	m->host[i].index = msr;
	m->host[i].value = host_val;
}

static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
{
	u64 guest_efer = vmx->vcpu.arch.efer;
	u64 ignore_bits = 0;

	if (!enable_ept) {
		/*
		 * NX is needed to handle CR0.WP=1, CR4.SMEP=1.  Testing
		 * host CPUID is more efficient than testing guest CPUID
		 * or CR4.  Host SMEP is anyway a requirement for guest SMEP.
		 */
		if (boot_cpu_has(X86_FEATURE_SMEP))
			guest_efer |= EFER_NX;
		else if (!(guest_efer & EFER_NX))
			ignore_bits |= EFER_NX;
	}

	/*
	 * LMA and LME handled by hardware; SCE meaningless outside long mode.
	 */
	ignore_bits |= 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

	clear_atomic_switch_msr(vmx, MSR_EFER);

	/*
	 * On EPT, we can't emulate NX, so we must switch EFER atomically.
	 * On CPUs that support "load IA32_EFER", always switch EFER
	 * atomically, since it's faster than switching it manually.
	 */
	if (cpu_has_load_ia32_efer ||
	    (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX))) {
		if (!(guest_efer & EFER_LMA))
			guest_efer &= ~EFER_LME;
		if (guest_efer != host_efer)
			add_atomic_switch_msr(vmx, MSR_EFER,
					      guest_efer, host_efer);
		return false;
	} else {
		guest_efer &= ~ignore_bits;
		guest_efer |= host_efer & ignore_bits;

		vmx->guest_msrs[efer_offset].data = guest_efer;
		vmx->guest_msrs[efer_offset].mask = ~ignore_bits;

		return true;
	}
}

#ifdef CONFIG_X86_32
/*
 * On 32-bit kernels, VM exits still load the FS and GS bases from the
 * VMCS rather than the segment table.  KVM uses this helper to figure
 * out the current bases to poke them into the VMCS before entry.
 */
static unsigned long segment_base(u16 selector)
{
	struct desc_struct *table;
	unsigned long v;

	if (!(selector & ~SEGMENT_RPL_MASK))
		return 0;

	table = get_current_gdt_ro();

	if ((selector & SEGMENT_TI_MASK) == SEGMENT_LDT) {
		u16 ldt_selector = kvm_read_ldt();

		if (!(ldt_selector & ~SEGMENT_RPL_MASK))
			return 0;

		table = (struct desc_struct *)segment_base(ldt_selector);
	}
	v = get_desc_base(&table[selector >> 3]);
	return v;
}
#endif

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

	if (vmx->host_state.loaded)
		return;

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

#ifdef CONFIG_X86_64
	savesegment(ds, vmx->host_state.ds_sel);
	savesegment(es, vmx->host_state.es_sel);
#endif

#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
	vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
	vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
#endif

#ifdef CONFIG_X86_64
	rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
	if (is_long_mode(&vmx->vcpu))
		wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
#endif
	if (boot_cpu_has(X86_FEATURE_MPX))
		rdmsrl(MSR_IA32_BNDCFGS, vmx->host_state.msr_host_bndcfgs);
	for (i = 0; i < vmx->save_nmsrs; ++i)
		kvm_set_shared_msr(vmx->guest_msrs[i].index,
				   vmx->guest_msrs[i].data,
				   vmx->guest_msrs[i].mask);
}

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

	++vmx->vcpu.stat.host_state_reload;
	vmx->host_state.loaded = 0;
#ifdef CONFIG_X86_64
	if (is_long_mode(&vmx->vcpu))
		rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
#endif
	if (vmx->host_state.gs_ldt_reload_needed) {
		kvm_load_ldt(vmx->host_state.ldt_sel);
#ifdef CONFIG_X86_64
		load_gs_index(vmx->host_state.gs_sel);
#else
		loadsegment(gs, vmx->host_state.gs_sel);
#endif
	}
	if (vmx->host_state.fs_reload_needed)
		loadsegment(fs, vmx->host_state.fs_sel);
#ifdef CONFIG_X86_64
	if (unlikely(vmx->host_state.ds_sel | vmx->host_state.es_sel)) {
		loadsegment(ds, vmx->host_state.ds_sel);
		loadsegment(es, vmx->host_state.es_sel);
	}
#endif
	invalidate_tss_limit();
#ifdef CONFIG_X86_64
	wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
#endif
	if (vmx->host_state.msr_host_bndcfgs)
		wrmsrl(MSR_IA32_BNDCFGS, vmx->host_state.msr_host_bndcfgs);
	load_fixmap_gdt(raw_smp_processor_id());
}

static void vmx_load_host_state(struct vcpu_vmx *vmx)
{
	preempt_disable();
	__vmx_load_host_state(vmx);
	preempt_enable();
}

static void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu)
{
	struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
	struct pi_desc old, new;
	unsigned int dest;

	/*
	 * In case of hot-plug or hot-unplug, we may have to undo
	 * vmx_vcpu_pi_put even if there is no assigned device.  And we
	 * always keep PI.NDST up to date for simplicity: it makes the
	 * code easier, and CPU migration is not a fast path.
	 */
	if (!pi_test_sn(pi_desc) && vcpu->cpu == cpu)
		return;

	/*
	 * First handle the simple case where no cmpxchg is necessary; just
	 * allow posting non-urgent interrupts.
	 *
	 * If the 'nv' field is POSTED_INTR_WAKEUP_VECTOR, do not change
	 * PI.NDST: pi_post_block will do it for us and the wakeup_handler
	 * expects the VCPU to be on the blocked_vcpu_list that matches
	 * PI.NDST.
	 */
	if (pi_desc->nv == POSTED_INTR_WAKEUP_VECTOR ||
	    vcpu->cpu == cpu) {
		pi_clear_sn(pi_desc);
		return;
	}

	/* The full case.  */
	do {
		old.control = new.control = pi_desc->control;

		dest = cpu_physical_id(cpu);

		if (x2apic_enabled())
			new.ndst = dest;
		else
			new.ndst = (dest << 8) & 0xFF00;

		new.sn = 0;
	} while (cmpxchg64(&pi_desc->control, old.control,
			   new.control) != old.control);
}

static void decache_tsc_multiplier(struct vcpu_vmx *vmx)
{
	vmx->current_tsc_ratio = vmx->vcpu.arch.tsc_scaling_ratio;
	vmcs_write64(TSC_MULTIPLIER, vmx->current_tsc_ratio);
}

/*
 * Switches to specified vcpu, until a matching vcpu_put(), but assumes
 * vcpu mutex is already taken.
 */
static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	bool already_loaded = vmx->loaded_vmcs->cpu == cpu;

	if (!already_loaded) {
		loaded_vmcs_clear(vmx->loaded_vmcs);
		local_irq_disable();
		crash_disable_local_vmclear(cpu);

		/*
		 * Read loaded_vmcs->cpu should be before fetching
		 * loaded_vmcs->loaded_vmcss_on_cpu_link.
		 * See the comments in __loaded_vmcs_clear().
		 */
		smp_rmb();

		list_add(&vmx->loaded_vmcs->loaded_vmcss_on_cpu_link,
			 &per_cpu(loaded_vmcss_on_cpu, cpu));
		crash_enable_local_vmclear(cpu);
		local_irq_enable();
	}

	if (per_cpu(current_vmcs, cpu) != vmx->loaded_vmcs->vmcs) {
		per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs;
		vmcs_load(vmx->loaded_vmcs->vmcs);
	}

	if (!already_loaded) {
		void *gdt = get_current_gdt_ro();
		unsigned long sysenter_esp;

		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);

		/*
		 * Linux uses per-cpu TSS and GDT, so set these when switching
		 * processors.  See 22.2.4.
		 */
		vmcs_writel(HOST_TR_BASE,
			    (unsigned long)this_cpu_ptr(&cpu_tss));
		vmcs_writel(HOST_GDTR_BASE, (unsigned long)gdt);   /* 22.2.4 */

		/*
		 * VM exits change the host TR limit to 0x67 after a VM
		 * exit.  This is okay, since 0x67 covers everything except
		 * the IO bitmap and have have code to handle the IO bitmap
		 * being lost after a VM exit.
		 */
		BUILD_BUG_ON(IO_BITMAP_OFFSET - 1 != 0x67);

		rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
		vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */

		vmx->loaded_vmcs->cpu = cpu;
	}

	/* Setup TSC multiplier */
	if (kvm_has_tsc_control &&
	    vmx->current_tsc_ratio != vcpu->arch.tsc_scaling_ratio)
		decache_tsc_multiplier(vmx);

	vmx_vcpu_pi_load(vcpu, cpu);
	vmx->host_pkru = read_pkru();
}

static void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu)
{
	struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);

	if (!kvm_arch_has_assigned_device(vcpu->kvm) ||
		!irq_remapping_cap(IRQ_POSTING_CAP)  ||
		!kvm_vcpu_apicv_active(vcpu))
		return;

	/* Set SN when the vCPU is preempted */
	if (vcpu->preempted)
		pi_set_sn(pi_desc);
}

static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
{
	vmx_vcpu_pi_put(vcpu);

	__vmx_load_host_state(to_vmx(vcpu));
}

static bool emulation_required(struct kvm_vcpu *vcpu)
{
	return emulate_invalid_guest_state && !guest_state_valid(vcpu);
}

static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu);

/*
 * Return the cr0 value that a nested guest would read. This is a combination
 * of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by
 * its hypervisor (cr0_read_shadow).
 */
static inline unsigned long nested_read_cr0(struct vmcs12 *fields)
{
	return (fields->guest_cr0 & ~fields->cr0_guest_host_mask) |
		(fields->cr0_read_shadow & fields->cr0_guest_host_mask);
}
static inline unsigned long nested_read_cr4(struct vmcs12 *fields)
{
	return (fields->guest_cr4 & ~fields->cr4_guest_host_mask) |
		(fields->cr4_read_shadow & fields->cr4_guest_host_mask);
}

static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
{
	unsigned long rflags, save_rflags;

	if (!test_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail)) {
		__set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
		rflags = vmcs_readl(GUEST_RFLAGS);
		if (to_vmx(vcpu)->rmode.vm86_active) {
			rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
			save_rflags = to_vmx(vcpu)->rmode.save_rflags;
			rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
		}
		to_vmx(vcpu)->rflags = rflags;
	}
	return to_vmx(vcpu)->rflags;
}

static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
	unsigned long old_rflags = vmx_get_rflags(vcpu);

	__set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
	to_vmx(vcpu)->rflags = rflags;
	if (to_vmx(vcpu)->rmode.vm86_active) {
		to_vmx(vcpu)->rmode.save_rflags = rflags;
		rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
	}
	vmcs_writel(GUEST_RFLAGS, rflags);

	if ((old_rflags ^ to_vmx(vcpu)->rflags) & X86_EFLAGS_VM)
		to_vmx(vcpu)->emulation_required = emulation_required(vcpu);
}

static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu)
{
	u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
	int ret = 0;

	if (interruptibility & GUEST_INTR_STATE_STI)
		ret |= KVM_X86_SHADOW_INT_STI;
	if (interruptibility & GUEST_INTR_STATE_MOV_SS)
		ret |= KVM_X86_SHADOW_INT_MOV_SS;

	return ret;
}

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 & KVM_X86_SHADOW_INT_MOV_SS)
		interruptibility |= GUEST_INTR_STATE_MOV_SS;
	else if (mask & KVM_X86_SHADOW_INT_STI)
		interruptibility |= GUEST_INTR_STATE_STI;

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

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

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

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

static void nested_vmx_inject_exception_vmexit(struct kvm_vcpu *vcpu,
					       unsigned long exit_qual)
{
	struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
	unsigned int nr = vcpu->arch.exception.nr;
	u32 intr_info = nr | INTR_INFO_VALID_MASK;

	if (vcpu->arch.exception.has_error_code) {
		vmcs12->vm_exit_intr_error_code = vcpu->arch.exception.error_code;
		intr_info |= INTR_INFO_DELIVER_CODE_MASK;
	}

	if (kvm_exception_is_soft(nr))
		intr_info |= INTR_TYPE_SOFT_EXCEPTION;
	else
		intr_info |= INTR_TYPE_HARD_EXCEPTION;

	if (!(vmcs12->idt_vectoring_info_field & VECTORING_INFO_VALID_MASK) &&
	    vmx_get_nmi_mask(vcpu))
		intr_info |= INTR_INFO_UNBLOCK_NMI;

	nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI, intr_info, exit_qual);
}

/*
 * KVM wants to inject page-faults which it got to the guest. This function
 * checks whether in a nested guest, we need to inject them to L1 or L2.
 */
static int nested_vmx_check_exception(struct kvm_vcpu *vcpu, unsigned long *exit_qual)
{
	struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
	unsigned int nr = vcpu->arch.exception.nr;

	if (nr == PF_VECTOR) {
		if (vcpu->arch.exception.nested_apf) {
			*exit_qual = vcpu->arch.apf.nested_apf_token;
			return 1;
		}
		/*
		 * FIXME: we must not write CR2 when L1 intercepts an L2 #PF exception.
		 * The fix is to add the ancillary datum (CR2 or DR6) to structs
		 * kvm_queued_exception and kvm_vcpu_events, so that CR2 and DR6
		 * can be written only when inject_pending_event runs.  This should be
		 * conditional on a new capability---if the capability is disabled,
		 * kvm_multiple_exception would write the ancillary information to
		 * CR2 or DR6, for backwards ABI-compatibility.
		 */
		if (nested_vmx_is_page_fault_vmexit(vmcs12,
						    vcpu->arch.exception.error_code)) {
			*exit_qual = vcpu->arch.cr2;
			return 1;
		}
	} else {
		if (vmcs12->exception_bitmap & (1u << nr)) {
			if (nr == DB_VECTOR)
				*exit_qual = vcpu->arch.dr6;
			else
				*exit_qual = 0;
			return 1;
		}
	}

	return 0;
}

static void vmx_queue_exception(struct kvm_vcpu *vcpu)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	unsigned nr = vcpu->arch.exception.nr;
	bool has_error_code = vcpu->arch.exception.has_error_code;
	u32 error_code = vcpu->arch.exception.error_code;
	u32 intr_info = nr | INTR_INFO_VALID_MASK;

	if (has_error_code) {
		vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
		intr_info |= INTR_INFO_DELIVER_CODE_MASK;
	}

	if (vmx->rmode.vm86_active) {
		int inc_eip = 0;
		if (kvm_exception_is_soft(nr))
			inc_eip = vcpu->arch.event_exit_inst_len;
		if (kvm_inject_realmode_interrupt(vcpu, nr, inc_eip) != EMULATE_DONE)
			kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
		return;
	}

	if (kvm_exception_is_soft(nr)) {
		vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
			     vmx->vcpu.arch.event_exit_inst_len);
		intr_info |= INTR_TYPE_SOFT_EXCEPTION;
	} else
		intr_info |= INTR_TYPE_HARD_EXCEPTION;

	vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
}

static bool vmx_rdtscp_supported(void)
{
	return cpu_has_vmx_rdtscp();
}

static bool vmx_invpcid_supported(void)
{
	return cpu_has_vmx_invpcid() && enable_ept;
}

/*
 * Swap MSR entry in host/guest MSR entry array.
 */
static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
{
	struct shared_msr_entry tmp;

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

static void vmx_set_msr_bitmap(struct kvm_vcpu *vcpu)
{
	unsigned long *msr_bitmap;

	if (is_guest_mode(vcpu))
		msr_bitmap = to_vmx(vcpu)->nested.msr_bitmap;
	else if (cpu_has_secondary_exec_ctrls() &&
		 (vmcs_read32(SECONDARY_VM_EXEC_CONTROL) &
		  SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE)) {
		if (enable_apicv && kvm_vcpu_apicv_active(vcpu)) {
			if (is_long_mode(vcpu))
				msr_bitmap = vmx_msr_bitmap_longmode_x2apic_apicv;
			else
				msr_bitmap = vmx_msr_bitmap_legacy_x2apic_apicv;
		} else {
			if (is_long_mode(vcpu))
				msr_bitmap = vmx_msr_bitmap_longmode_x2apic;
			else
				msr_bitmap = vmx_msr_bitmap_legacy_x2apic;
		}
	} else {
		if (is_long_mode(vcpu))
			msr_bitmap = vmx_msr_bitmap_longmode;
		else
			msr_bitmap = vmx_msr_bitmap_legacy;
	}

	vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
}

/*
 * 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.
 */
static void setup_msrs(struct vcpu_vmx *vmx)
{
	int save_nmsrs, index;

	save_nmsrs = 0;
#ifdef CONFIG_X86_64
	if (is_long_mode(&vmx->vcpu)) {
		index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
		if (index >= 0)
			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_LSTAR);
		if (index >= 0)
			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_CSTAR);
		if (index >= 0)
			move_msr_up(vmx, index, save_nmsrs++);
		index = __find_msr_index(vmx, MSR_TSC_AUX);
		if (index >= 0 && guest_cpuid_has(&vmx->vcpu, X86_FEATURE_RDTSCP))
			move_msr_up(vmx, index, save_nmsrs++);
		/*
		 * MSR_STAR is only needed on long mode guests, and only
		 * if efer.sce is enabled.
		 */
		index = __find_msr_index(vmx, MSR_STAR);
		if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE))
			move_msr_up(vmx, index, save_nmsrs++);
	}
#endif
	index = __find_msr_index(vmx, MSR_EFER);
	if (index >= 0 && update_transition_efer(vmx, index))
		move_msr_up(vmx, index, save_nmsrs++);

	vmx->save_nmsrs = save_nmsrs;

	if (cpu_has_vmx_msr_bitmap())
		vmx_set_msr_bitmap(&vmx->vcpu);
}

/*
 * reads and returns guest's timestamp counter "register"
 * guest_tsc = (host_tsc * tsc multiplier) >> 48 + tsc_offset
 * -- Intel TSC Scaling for Virtualization White Paper, sec 1.3
 */
static u64 guest_read_tsc(struct kvm_vcpu *vcpu)
{
	u64 host_tsc, tsc_offset;

	host_tsc = rdtsc();
	tsc_offset = vmcs_read64(TSC_OFFSET);
	return kvm_scale_tsc(vcpu, host_tsc) + tsc_offset;
}

/*
 * writes 'offset' into guest's timestamp counter offset register
 */
static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
{
	if (is_guest_mode(vcpu)) {
		/*
		 * We're here if L1 chose not to trap WRMSR to TSC. According
		 * to the spec, this should set L1's TSC; The offset that L1
		 * set for L2 remains unchanged, and still needs to be added
		 * to the newly set TSC to get L2's TSC.
		 */
		struct vmcs12 *vmcs12;
		/* recalculate vmcs02.TSC_OFFSET: */
		vmcs12 = get_vmcs12(vcpu);
		vmcs_write64(TSC_OFFSET, offset +
			(nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETING) ?
			 vmcs12->tsc_offset : 0));
	} else {
		trace_kvm_write_tsc_offset(vcpu->vcpu_id,
					   vmcs_read64(TSC_OFFSET), offset);
		vmcs_write64(TSC_OFFSET, offset);
	}
}

/*
 * nested_vmx_allowed() checks whether a guest should be allowed to use VMX
 * instructions and MSRs (i.e., nested VMX). Nested VMX is disabled for
 * all guests if the "nested" module option is off, and can also be disabled
 * for a single guest by disabling its VMX cpuid bit.
 */
static inline bool nested_vmx_allowed(struct kvm_vcpu *vcpu)
{
	return nested && guest_cpuid_has(vcpu, X86_FEATURE_VMX);
}

/*
 * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be
 * returned for the various VMX controls MSRs when nested VMX is enabled.
 * The same values should also be used to verify that vmcs12 control fields are
 * valid during nested entry from L1 to L2.
 * Each of these control msrs has a low and high 32-bit half: A low bit is on
 * if the corresponding bit in the (32-bit) control field *must* be on, and a
 * bit in the high half is on if the corresponding bit in the control field
 * may be on. See also vmx_control_verify().
 */
static void nested_vmx_setup_ctls_msrs(struct vcpu_vmx *vmx)
{
	/*
	 * Note that as a general rule, the high half of the MSRs (bits in
	 * the control fields which may be 1) should be initialized by the
	 * intersection of the underlying hardware's MSR (i.e., features which
	 * can be supported) and the list of features we want to expose -
	 * because they are known to be properly supported in our code.
	 * Also, usually, the low half of the MSRs (bits which must be 1) can
	 * be set to 0, meaning that L1 may turn off any of these bits. The
	 * reason is that if one of these bits is necessary, it will appear
	 * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control
	 * fields of vmcs01 and vmcs02, will turn these bits off - and
	 * nested_vmx_exit_reflected() will not pass related exits to L1.
	 * These rules have exceptions below.
	 */

	/* pin-based controls */
	rdmsr(MSR_IA32_VMX_PINBASED_CTLS,
		vmx->nested.nested_vmx_pinbased_ctls_low,
		vmx->nested.nested_vmx_pinbased_ctls_high);
	vmx->nested.nested_vmx_pinbased_ctls_low |=
		PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
	vmx->nested.nested_vmx_pinbased_ctls_high &=
		PIN_BASED_EXT_INTR_MASK |
		PIN_BASED_NMI_EXITING |
		PIN_BASED_VIRTUAL_NMIS;
	vmx->nested.nested_vmx_pinbased_ctls_high |=
		PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR |
		PIN_BASED_VMX_PREEMPTION_TIMER;
	if (kvm_vcpu_apicv_active(&vmx->vcpu))
		vmx->nested.nested_vmx_pinbased_ctls_high |=
			PIN_BASED_POSTED_INTR;

	/* exit controls */
	rdmsr(MSR_IA32_VMX_EXIT_CTLS,
		vmx->nested.nested_vmx_exit_ctls_low,
		vmx->nested.nested_vmx_exit_ctls_high);
	vmx->nested.nested_vmx_exit_ctls_low =
		VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR;

	vmx->nested.nested_vmx_exit_ctls_high &=
#ifdef CONFIG_X86_64
		VM_EXIT_HOST_ADDR_SPACE_SIZE |
#endif
		VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT;
	vmx->nested.nested_vmx_exit_ctls_high |=
		VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR |
		VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER |
		VM_EXIT_SAVE_VMX_PREEMPTION_TIMER | VM_EXIT_ACK_INTR_ON_EXIT;

	if (kvm_mpx_supported())
		vmx->nested.nested_vmx_exit_ctls_high |= VM_EXIT_CLEAR_BNDCFGS;

	/* We support free control of debug control saving. */
	vmx->nested.nested_vmx_exit_ctls_low &= ~VM_EXIT_SAVE_DEBUG_CONTROLS;

	/* entry controls */
	rdmsr(MSR_IA32_VMX_ENTRY_CTLS,
		vmx->nested.nested_vmx_entry_ctls_low,
		vmx->nested.nested_vmx_entry_ctls_high);
	vmx->nested.nested_vmx_entry_ctls_low =
		VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR;
	vmx->nested.nested_vmx_entry_ctls_high &=
#ifdef CONFIG_X86_64
		VM_ENTRY_IA32E_MODE |
#endif
		VM_ENTRY_LOAD_IA32_PAT;
	vmx->nested.nested_vmx_entry_ctls_high |=
		(VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR | VM_ENTRY_LOAD_IA32_EFER);
	if (kvm_mpx_supported())
		vmx->nested.nested_vmx_entry_ctls_high |= VM_ENTRY_LOAD_BNDCFGS;

	/* We support free control of debug control loading. */
	vmx->nested.nested_vmx_entry_ctls_low &= ~VM_ENTRY_LOAD_DEBUG_CONTROLS;

	/* cpu-based controls */
	rdmsr(MSR_IA32_VMX_PROCBASED_CTLS,
		vmx->nested.nested_vmx_procbased_ctls_low,
		vmx->nested.nested_vmx_procbased_ctls_high);
	vmx->nested.nested_vmx_procbased_ctls_low =
		CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
	vmx->nested.nested_vmx_procbased_ctls_high &=
		CPU_BASED_VIRTUAL_INTR_PENDING |
		CPU_BASED_VIRTUAL_NMI_PENDING | CPU_BASED_USE_TSC_OFFSETING |
		CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING |
		CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING |
		CPU_BASED_CR3_STORE_EXITING |
#ifdef CONFIG_X86_64
		CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING |
#endif
		CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING |
		CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_TRAP_FLAG |
		CPU_BASED_MONITOR_EXITING | CPU_BASED_RDPMC_EXITING |
		CPU_BASED_RDTSC_EXITING | CPU_BASED_PAUSE_EXITING |
		CPU_BASED_TPR_SHADOW | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
	/*
	 * We can allow some features even when not supported by the
	 * hardware. For example, L1 can specify an MSR bitmap - and we
	 * can use it to avoid exits to L1 - even when L0 runs L2
	 * without MSR bitmaps.
	 */
	vmx->nested.nested_vmx_procbased_ctls_high |=
		CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR |
		CPU_BASED_USE_MSR_BITMAPS;

	/* We support free control of CR3 access interception. */
	vmx->nested.nested_vmx_procbased_ctls_low &=
		~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING);

	/*
	 * secondary cpu-based controls.  Do not include those that
	 * depend on CPUID bits, they are added later by vmx_cpuid_update.
	 */
	rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
		vmx->nested.nested_vmx_secondary_ctls_low,
		vmx->nested.nested_vmx_secondary_ctls_high);
	vmx->nested.nested_vmx_secondary_ctls_low = 0;
	vmx->nested.nested_vmx_secondary_ctls_high &=
		SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
		SECONDARY_EXEC_DESC |
		SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
		SECONDARY_EXEC_APIC_REGISTER_VIRT |
		SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
		SECONDARY_EXEC_WBINVD_EXITING;

	if (enable_ept) {
		/* nested EPT: emulate EPT also to L1 */
		vmx->nested.nested_vmx_secondary_ctls_high |=
			SECONDARY_EXEC_ENABLE_EPT;
		vmx->nested.nested_vmx_ept_caps = VMX_EPT_PAGE_WALK_4_BIT |
			 VMX_EPTP_WB_BIT | VMX_EPT_INVEPT_BIT;
		if (cpu_has_vmx_ept_execute_only())
			vmx->nested.nested_vmx_ept_caps |=
				VMX_EPT_EXECUTE_ONLY_BIT;
		vmx->nested.nested_vmx_ept_caps &= vmx_capability.ept;
		vmx->nested.nested_vmx_ept_caps |= VMX_EPT_EXTENT_GLOBAL_BIT |
			VMX_EPT_EXTENT_CONTEXT_BIT | VMX_EPT_2MB_PAGE_BIT |
			VMX_EPT_1GB_PAGE_BIT;
		if (enable_ept_ad_bits) {
			vmx->nested.nested_vmx_secondary_ctls_high |=
				SECONDARY_EXEC_ENABLE_PML;
			vmx->nested.nested_vmx_ept_caps |= VMX_EPT_AD_BIT;
		}
	} else
		vmx->nested.nested_vmx_ept_caps = 0;

	if (cpu_has_vmx_vmfunc()) {
		vmx->nested.nested_vmx_secondary_ctls_high |=
			SECONDARY_EXEC_ENABLE_VMFUNC;
		/*
		 * Advertise EPTP switching unconditionally
		 * since we emulate it
		 */
		vmx->nested.nested_vmx_vmfunc_controls =
			VMX_VMFUNC_EPTP_SWITCHING;
	}

	/*
	 * Old versions of KVM use the single-context version without
	 * checking for support, so declare that it is supported even
	 * though it is treated as global context.  The alternative is
	 * not failing the single-context invvpid, and it is worse.
	 */
	if (enable_vpid) {
		vmx->nested.nested_vmx_secondary_ctls_high |=
			SECONDARY_EXEC_ENABLE_VPID;
		vmx->nested.nested_vmx_vpid_caps = VMX_VPID_INVVPID_BIT |
			VMX_VPID_EXTENT_SUPPORTED_MASK;
	} else
		vmx->nested.nested_vmx_vpid_caps = 0;

	if (enable_unrestricted_guest)
		vmx->nested.nested_vmx_secondary_ctls_high |=
			SECONDARY_EXEC_UNRESTRICTED_GUEST;

	/* miscellaneous data */
	rdmsr(MSR_IA32_VMX_MISC,
		vmx->nested.nested_vmx_misc_low,
		vmx->nested.nested_vmx_misc_high);
	vmx->nested.nested_vmx_misc_low &= VMX_MISC_SAVE_EFER_LMA;
	vmx->nested.nested_vmx_misc_low |=
		VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE |
		VMX_MISC_ACTIVITY_HLT;
	vmx->nested.nested_vmx_misc_high = 0;

	/*
	 * This MSR reports some information about VMX support. We
	 * should return information about the VMX we emulate for the
	 * guest, and the VMCS structure we give it - not about the
	 * VMX support of the underlying hardware.
	 */
	vmx->nested.nested_vmx_basic =
		VMCS12_REVISION |
		VMX_BASIC_TRUE_CTLS |
		((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
		(VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);

	if (cpu_has_vmx_basic_inout())
		vmx->nested.nested_vmx_basic |= VMX_BASIC_INOUT;

	/*
	 * These MSRs specify bits which the guest must keep fixed on
	 * while L1 is in VMXON mode (in L1's root mode, or running an L2).
	 * We picked the standard core2 setting.
	 */
#define VMXON_CR0_ALWAYSON     (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE)
#define VMXON_CR4_ALWAYSON     X86_CR4_VMXE
	vmx->nested.nested_vmx_cr0_fixed0 = VMXON_CR0_ALWAYSON;
	vmx->nested.nested_vmx_cr4_fixed0 = VMXON_CR4_ALWAYSON;

	/* These MSRs specify bits which the guest must keep fixed off. */
	rdmsrl(MSR_IA32_VMX_CR0_FIXED1, vmx->nested.nested_vmx_cr0_fixed1);
	rdmsrl(MSR_IA32_VMX_CR4_FIXED1, vmx->nested.nested_vmx_cr4_fixed1);

	/* highest index: VMX_PREEMPTION_TIMER_VALUE */
	vmx->nested.nested_vmx_vmcs_enum = 0x2e;
}

/*
 * if fixed0[i] == 1: val[i] must be 1
 * if fixed1[i] == 0: val[i] must be 0
 */
static inline bool fixed_bits_valid(u64 val, u64 fixed0, u64 fixed1)
{
	return ((val & fixed1) | fixed0) == val;
}

static inline bool vmx_control_verify(u32 control, u32 low, u32 high)
{
	return fixed_bits_valid(control, low, high);
}

static inline u64 vmx_control_msr(u32 low, u32 high)
{
	return low | ((u64)high << 32);
}

static bool is_bitwise_subset(u64 superset, u64 subset, u64 mask)
{
	superset &= mask;
	subset &= mask;

	return (superset | subset) == superset;
}

static int vmx_restore_vmx_basic(struct vcpu_vmx *vmx, u64 data)
{
	const u64 feature_and_reserved =
		/* feature (except bit 48; see below) */
		BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55) |
		/* reserved */
		BIT_ULL(31) | GENMASK_ULL(47, 45) | GENMASK_ULL(63, 56);
	u64 vmx_basic = vmx->nested.nested_vmx_basic;

	if (!is_bitwise_subset(vmx_basic, data, feature_and_reserved))
		return -EINVAL;

	/*
	 * KVM does not emulate a version of VMX that constrains physical
	 * addresses of VMX structures (e.g. VMCS) to 32-bits.
	 */
	if (data & BIT_ULL(48))
		return -EINVAL;

	if (vmx_basic_vmcs_revision_id(vmx_basic) !=
	    vmx_basic_vmcs_revision_id(data))
		return -EINVAL;

	if (vmx_basic_vmcs_size(vmx_basic) > vmx_basic_vmcs_size(data))
		return -EINVAL;

	vmx->nested.nested_vmx_basic = data;
	return 0;
}

static int
vmx_restore_control_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data)
{
	u64 supported;
	u32 *lowp, *highp;

	switch (msr_index) {
	case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
		lowp = &vmx->nested.nested_vmx_pinbased_ctls_low;
		highp = &vmx->nested.nested_vmx_pinbased_ctls_high;
		break;
	case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
		lowp = &vmx->nested.nested_vmx_procbased_ctls_low;
		highp = &vmx->nested.nested_vmx_procbased_ctls_high;
		break;
	case MSR_IA32_VMX_TRUE_EXIT_CTLS:
		lowp = &vmx->nested.nested_vmx_exit_ctls_low;
		highp = &vmx->nested.nested_vmx_exit_ctls_high;
		break;
	case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
		lowp = &vmx->nested.nested_vmx_entry_ctls_low;
		highp = &vmx->nested.nested_vmx_entry_ctls_high;
		break;
	case MSR_IA32_VMX_PROCBASED_CTLS2:
		lowp = &vmx->nested.nested_vmx_secondary_ctls_low;
		highp = &vmx->nested.nested_vmx_secondary_ctls_high;
		break;
	default:
		BUG();
	}

	supported = vmx_control_msr(*lowp, *highp);

	/* Check must-be-1 bits are still 1. */
	if (!is_bitwise_subset(data, supported, GENMASK_ULL(31, 0)))
		return -EINVAL;

	/* Check must-be-0 bits are still 0. */
	if (!is_bitwise_subset(supported, data, GENMASK_ULL(63, 32)))
		return -EINVAL;

	*lowp = data;
	*highp = data >> 32;
	return 0;
}

static int vmx_restore_vmx_misc(struct vcpu_vmx *vmx, u64 data)
{
	const u64 feature_and_reserved_bits =
		/* feature */
		BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) | BIT_ULL(15) |
		BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30) |
		/* reserved */
		GENMASK_ULL(13, 9) | BIT_ULL(31);
	u64 vmx_misc;

	vmx_misc = vmx_control_msr(vmx->nested.nested_vmx_misc_low,
				   vmx->nested.nested_vmx_misc_high);

	if (!is_bitwise_subset(vmx_misc, data, feature_and_reserved_bits))
		return -EINVAL;

	if ((vmx->nested.nested_vmx_pinbased_ctls_high &
	     PIN_BASED_VMX_PREEMPTION_TIMER) &&
	    vmx_misc_preemption_timer_rate(data) !=
	    vmx_misc_preemption_timer_rate(vmx_misc))
		return -EINVAL;

	if (vmx_misc_cr3_count(data) > vmx_misc_cr3_count(vmx_misc))
		return -EINVAL;

	if (vmx_misc_max_msr(data) > vmx_misc_max_msr(vmx_misc))
		return -EINVAL;

	if (vmx_misc_mseg_revid(data) != vmx_misc_mseg_revid(vmx_misc))
		return -EINVAL;

	vmx->nested.nested_vmx_misc_low = data;
	vmx->nested.nested_vmx_misc_high = data >> 32;
	return 0;
}

static int vmx_restore_vmx_ept_vpid_cap(struct vcpu_vmx *vmx, u64 data)
{
	u64 vmx_ept_vpid_cap;

	vmx_ept_vpid_cap = vmx_control_msr(vmx->nested.nested_vmx_ept_caps,
					   vmx->nested.nested_vmx_vpid_caps);

	/* Every bit is either reserved or a feature bit. */
	if (!is_bitwise_subset(vmx_ept_vpid_cap, data, -1ULL))
		return -EINVAL;

	vmx->nested.nested_vmx_ept_caps = data;
	vmx->nested.nested_vmx_vpid_caps = data >> 32;
	return 0;
}

static int vmx_restore_fixed0_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data)
{
	u64 *msr;

	switch (msr_index) {
	case MSR_IA32_VMX_CR0_FIXED0:
		msr = &vmx->nested.nested_vmx_cr0_fixed0;
		break;
	case MSR_IA32_VMX_CR4_FIXED0:
		msr = &vmx->nested.nested_vmx_cr4_fixed0;
		break;
	default:
		BUG();
	}

	/*
	 * 1 bits (which indicates bits which "must-be-1" during VMX operation)
	 * must be 1 in the restored value.
	 */
	if (!is_bitwise_subset(data, *msr, -1ULL))
		return -EINVAL;

	*msr = data;
	return 0;
}

/*
 * Called when userspace is restoring VMX MSRs.
 *
 * Returns 0 on success, non-0 otherwise.
 */
static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);

	switch (msr_index) {
	case MSR_IA32_VMX_BASIC:
		return vmx_restore_vmx_basic(vmx, data);
	case MSR_IA32_VMX_PINBASED_CTLS:
	case MSR_IA32_VMX_PROCBASED_CTLS:
	case MSR_IA32_VMX_EXIT_CTLS:
	case MSR_IA32_VMX_ENTRY_CTLS:
		/*
		 * The "non-true" VMX capability MSRs are generated from the
		 * "true" MSRs, so we do not support restoring them directly.
		 *
		 * If userspace wants to emulate VMX_BASIC[55]=0, userspace
		 * should restore the "true" MSRs with the must-be-1 bits
		 * set according to the SDM Vol 3. A.2 "RESERVED CONTROLS AND
		 * DEFAULT SETTINGS".
		 */
		return -EINVAL;
	case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
	case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
	case MSR_IA32_VMX_TRUE_EXIT_CTLS:
	case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
	case MSR_IA32_VMX_PROCBASED_CTLS2:
		return vmx_restore_control_msr(vmx, msr_index, data);
	case MSR_IA32_VMX_MISC:
		return vmx_restore_vmx_misc(vmx, data);
	case MSR_IA32_VMX_CR0_FIXED0:
	case MSR_IA32_VMX_CR4_FIXED0:
		return vmx_restore_fixed0_msr(vmx, msr_index, data);
	case MSR_IA32_VMX_CR0_FIXED1:
	case MSR_IA32_VMX_CR4_FIXED1:
		/*
		 * These MSRs are generated based on the vCPU's CPUID, so we
		 * do not support restoring them directly.
		 */
		return -EINVAL;
	case MSR_IA32_VMX_EPT_VPID_CAP:
		return vmx_restore_vmx_ept_vpid_cap(vmx, data);
	case MSR_IA32_VMX_VMCS_ENUM:
		vmx->nested.nested_vmx_vmcs_enum = data;
		return 0;
	default:
		/*
		 * The rest of the VMX capability MSRs do not support restore.
		 */
		return -EINVAL;
	}
}

/* Returns 0 on success, non-0 otherwise. */
static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);

	switch (msr_index) {
	case MSR_IA32_VMX_BASIC:
		*pdata = vmx->nested.nested_vmx_basic;
		break;
	case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
	case MSR_IA32_VMX_PINBASED_CTLS:
		*pdata = vmx_control_msr(
			vmx->nested.nested_vmx_pinbased_ctls_low,
			vmx->nested.nested_vmx_pinbased_ctls_high);
		if (msr_index == MSR_IA32_VMX_PINBASED_CTLS)
			*pdata |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
		break;
	case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
	case MSR_IA32_VMX_PROCBASED_CTLS:
		*pdata = vmx_control_msr(
			vmx->nested.nested_vmx_procbased_ctls_low,
			vmx->nested.nested_vmx_procbased_ctls_high);
		if (msr_index == MSR_IA32_VMX_PROCBASED_CTLS)
			*pdata |= CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
		break;
	case MSR_IA32_VMX_TRUE_EXIT_CTLS:
	case MSR_IA32_VMX_EXIT_CTLS:
		*pdata = vmx_control_msr(
			vmx->nested.nested_vmx_exit_ctls_low,
			vmx->nested.nested_vmx_exit_ctls_high);
		if (msr_index == MSR_IA32_VMX_EXIT_CTLS)
			*pdata |= VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR;
		break;
	case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
	case MSR_IA32_VMX_ENTRY_CTLS:
		*pdata = vmx_control_msr(
			vmx->nested.nested_vmx_entry_ctls_low,
			vmx->nested.nested_vmx_entry_ctls_high);
		if (msr_index == MSR_IA32_VMX_ENTRY_CTLS)
			*pdata |= VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR;
		break;
	case MSR_IA32_VMX_MISC:
		*pdata = vmx_control_msr(
			vmx->nested.nested_vmx_misc_low,
			vmx->nested.nested_vmx_misc_high);
		break;
	case MSR_IA32_VMX_CR0_FIXED0:
		*pdata = vmx->nested.nested_vmx_cr0_fixed0;
		break;
	case MSR_IA32_VMX_CR0_FIXED1:
		*pdata = vmx->nested.nested_vmx_cr0_fixed1;
		break;
	case MSR_IA32_VMX_CR4_FIXED0:
		*pdata = vmx->nested.nested_vmx_cr4_fixed0;
		break;
	case MSR_IA32_VMX_CR4_FIXED1:
		*pdata = vmx->nested.nested_vmx_cr4_fixed1;
		break;
	case MSR_IA32_VMX_VMCS_ENUM:
		*pdata = vmx->nested.nested_vmx_vmcs_enum;
		break;
	case MSR_IA32_VMX_PROCBASED_CTLS2:
		*pdata = vmx_control_msr(
			vmx->nested.nested_vmx_secondary_ctls_low,
			vmx->nested.nested_vmx_secondary_ctls_high);
		break;
	case MSR_IA32_VMX_EPT_VPID_CAP:
		*pdata = vmx->nested.nested_vmx_ept_caps |
			((u64)vmx->nested.nested_vmx_vpid_caps << 32);