Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

[linux-block.git] / arch / x86 / include / asm / kvm_host.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * This header defines architecture specific interfaces, x86 version
 */

#ifndef _ASM_X86_KVM_HOST_H
#define _ASM_X86_KVM_HOST_H

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/mmu_notifier.h>
#include <linux/tracepoint.h>
#include <linux/cpumask.h>
#include <linux/irq_work.h>
#include <linux/irq.h>
#include <linux/workqueue.h>

#include <linux/kvm.h>
#include <linux/kvm_para.h>
#include <linux/kvm_types.h>
#include <linux/perf_event.h>
#include <linux/pvclock_gtod.h>
#include <linux/clocksource.h>
#include <linux/irqbypass.h>
#include <linux/hyperv.h>

#include <asm/apic.h>
#include <asm/pvclock-abi.h>
#include <asm/desc.h>
#include <asm/mtrr.h>
#include <asm/msr-index.h>
#include <asm/asm.h>
#include <asm/kvm_page_track.h>
#include <asm/kvm_vcpu_regs.h>
#include <asm/hyperv-tlfs.h>

#define __KVM_HAVE_ARCH_VCPU_DEBUGFS

#define KVM_MAX_VCPUS 1024

/*
 * In x86, the VCPU ID corresponds to the APIC ID, and APIC IDs
 * might be larger than the actual number of VCPUs because the
 * APIC ID encodes CPU topology information.
 *
 * In the worst case, we'll need less than one extra bit for the
 * Core ID, and less than one extra bit for the Package (Die) ID,
 * so ratio of 4 should be enough.
 */
#define KVM_VCPU_ID_RATIO 4
#define KVM_MAX_VCPU_IDS (KVM_MAX_VCPUS * KVM_VCPU_ID_RATIO)

/* memory slots that are not exposed to userspace */
#define KVM_INTERNAL_MEM_SLOTS 3

#define KVM_HALT_POLL_NS_DEFAULT 200000

#define KVM_IRQCHIP_NUM_PINS  KVM_IOAPIC_NUM_PINS

#define KVM_DIRTY_LOG_MANUAL_CAPS   (KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE | \
                                        KVM_DIRTY_LOG_INITIALLY_SET)

#define KVM_BUS_LOCK_DETECTION_VALID_MODE       (KVM_BUS_LOCK_DETECTION_OFF | \
                                                 KVM_BUS_LOCK_DETECTION_EXIT)

#define KVM_X86_NOTIFY_VMEXIT_VALID_BITS        (KVM_X86_NOTIFY_VMEXIT_ENABLED | \
                                                 KVM_X86_NOTIFY_VMEXIT_USER)

/* x86-specific vcpu->requests bit members */
#define KVM_REQ_MIGRATE_TIMER           KVM_ARCH_REQ(0)
#define KVM_REQ_REPORT_TPR_ACCESS       KVM_ARCH_REQ(1)
#define KVM_REQ_TRIPLE_FAULT            KVM_ARCH_REQ(2)
#define KVM_REQ_MMU_SYNC                KVM_ARCH_REQ(3)
#define KVM_REQ_CLOCK_UPDATE            KVM_ARCH_REQ(4)
#define KVM_REQ_LOAD_MMU_PGD            KVM_ARCH_REQ(5)
#define KVM_REQ_EVENT                   KVM_ARCH_REQ(6)
#define KVM_REQ_APF_HALT                KVM_ARCH_REQ(7)
#define KVM_REQ_STEAL_UPDATE            KVM_ARCH_REQ(8)
#define KVM_REQ_NMI                     KVM_ARCH_REQ(9)
#define KVM_REQ_PMU                     KVM_ARCH_REQ(10)
#define KVM_REQ_PMI                     KVM_ARCH_REQ(11)
#define KVM_REQ_SMI                     KVM_ARCH_REQ(12)
#define KVM_REQ_MASTERCLOCK_UPDATE      KVM_ARCH_REQ(13)
#define KVM_REQ_MCLOCK_INPROGRESS \
        KVM_ARCH_REQ_FLAGS(14, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_SCAN_IOAPIC \
        KVM_ARCH_REQ_FLAGS(15, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_GLOBAL_CLOCK_UPDATE     KVM_ARCH_REQ(16)
#define KVM_REQ_APIC_PAGE_RELOAD \
        KVM_ARCH_REQ_FLAGS(17, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_HV_CRASH                KVM_ARCH_REQ(18)
#define KVM_REQ_IOAPIC_EOI_EXIT         KVM_ARCH_REQ(19)
#define KVM_REQ_HV_RESET                KVM_ARCH_REQ(20)
#define KVM_REQ_HV_EXIT                 KVM_ARCH_REQ(21)
#define KVM_REQ_HV_STIMER               KVM_ARCH_REQ(22)
#define KVM_REQ_LOAD_EOI_EXITMAP        KVM_ARCH_REQ(23)
#define KVM_REQ_GET_NESTED_STATE_PAGES  KVM_ARCH_REQ(24)
#define KVM_REQ_APICV_UPDATE \
        KVM_ARCH_REQ_FLAGS(25, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_TLB_FLUSH_CURRENT       KVM_ARCH_REQ(26)
#define KVM_REQ_TLB_FLUSH_GUEST \
        KVM_ARCH_REQ_FLAGS(27, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_APF_READY               KVM_ARCH_REQ(28)
#define KVM_REQ_MSR_FILTER_CHANGED      KVM_ARCH_REQ(29)
#define KVM_REQ_UPDATE_CPU_DIRTY_LOGGING \
        KVM_ARCH_REQ_FLAGS(30, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
#define KVM_REQ_MMU_FREE_OBSOLETE_ROOTS \
        KVM_ARCH_REQ_FLAGS(31, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)

#define CR0_RESERVED_BITS                                               \
        (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
                          | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
                          | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))

#define CR4_RESERVED_BITS                                               \
        (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
                          | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE     \
                          | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR | X86_CR4_PCIDE \
                          | X86_CR4_OSXSAVE | X86_CR4_SMEP | X86_CR4_FSGSBASE \
                          | X86_CR4_OSXMMEXCPT | X86_CR4_LA57 | X86_CR4_VMXE \
                          | X86_CR4_SMAP | X86_CR4_PKE | X86_CR4_UMIP))

#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)



#define INVALID_PAGE (~(hpa_t)0)
#define VALID_PAGE(x) ((x) != INVALID_PAGE)

#define INVALID_GPA (~(gpa_t)0)

/* KVM Hugepage definitions for x86 */
#define KVM_MAX_HUGEPAGE_LEVEL  PG_LEVEL_1G
#define KVM_NR_PAGE_SIZES       (KVM_MAX_HUGEPAGE_LEVEL - PG_LEVEL_4K + 1)
#define KVM_HPAGE_GFN_SHIFT(x)  (((x) - 1) * 9)
#define KVM_HPAGE_SHIFT(x)      (PAGE_SHIFT + KVM_HPAGE_GFN_SHIFT(x))
#define KVM_HPAGE_SIZE(x)       (1UL << KVM_HPAGE_SHIFT(x))
#define KVM_HPAGE_MASK(x)       (~(KVM_HPAGE_SIZE(x) - 1))
#define KVM_PAGES_PER_HPAGE(x)  (KVM_HPAGE_SIZE(x) / PAGE_SIZE)

#define KVM_MEMSLOT_PAGES_TO_MMU_PAGES_RATIO 50
#define KVM_MIN_ALLOC_MMU_PAGES 64UL
#define KVM_MMU_HASH_SHIFT 12
#define KVM_NUM_MMU_PAGES (1 << KVM_MMU_HASH_SHIFT)
#define KVM_MIN_FREE_MMU_PAGES 5
#define KVM_REFILL_PAGES 25
#define KVM_MAX_CPUID_ENTRIES 256
#define KVM_NR_FIXED_MTRR_REGION 88
#define KVM_NR_VAR_MTRR 8

#define ASYNC_PF_PER_VCPU 64

enum kvm_reg {
        VCPU_REGS_RAX = __VCPU_REGS_RAX,
        VCPU_REGS_RCX = __VCPU_REGS_RCX,
        VCPU_REGS_RDX = __VCPU_REGS_RDX,
        VCPU_REGS_RBX = __VCPU_REGS_RBX,
        VCPU_REGS_RSP = __VCPU_REGS_RSP,
        VCPU_REGS_RBP = __VCPU_REGS_RBP,
        VCPU_REGS_RSI = __VCPU_REGS_RSI,
        VCPU_REGS_RDI = __VCPU_REGS_RDI,
#ifdef CONFIG_X86_64
        VCPU_REGS_R8  = __VCPU_REGS_R8,
        VCPU_REGS_R9  = __VCPU_REGS_R9,
        VCPU_REGS_R10 = __VCPU_REGS_R10,
        VCPU_REGS_R11 = __VCPU_REGS_R11,
        VCPU_REGS_R12 = __VCPU_REGS_R12,
        VCPU_REGS_R13 = __VCPU_REGS_R13,
        VCPU_REGS_R14 = __VCPU_REGS_R14,
        VCPU_REGS_R15 = __VCPU_REGS_R15,
#endif
        VCPU_REGS_RIP,
        NR_VCPU_REGS,

        VCPU_EXREG_PDPTR = NR_VCPU_REGS,
        VCPU_EXREG_CR0,
        VCPU_EXREG_CR3,
        VCPU_EXREG_CR4,
        VCPU_EXREG_RFLAGS,
        VCPU_EXREG_SEGMENTS,
        VCPU_EXREG_EXIT_INFO_1,
        VCPU_EXREG_EXIT_INFO_2,
};

enum {
        VCPU_SREG_ES,
        VCPU_SREG_CS,
        VCPU_SREG_SS,
        VCPU_SREG_DS,
        VCPU_SREG_FS,
        VCPU_SREG_GS,
        VCPU_SREG_TR,
        VCPU_SREG_LDTR,
};

enum exit_fastpath_completion {
        EXIT_FASTPATH_NONE,
        EXIT_FASTPATH_REENTER_GUEST,
        EXIT_FASTPATH_EXIT_HANDLED,
};
typedef enum exit_fastpath_completion fastpath_t;

struct x86_emulate_ctxt;
struct x86_exception;
enum x86_intercept;
enum x86_intercept_stage;

#define KVM_NR_DB_REGS  4

#define DR6_BUS_LOCK   (1 << 11)
#define DR6_BD          (1 << 13)
#define DR6_BS          (1 << 14)
#define DR6_BT          (1 << 15)
#define DR6_RTM         (1 << 16)
/*
 * DR6_ACTIVE_LOW combines fixed-1 and active-low bits.
 * We can regard all the bits in DR6_FIXED_1 as active_low bits;
 * they will never be 0 for now, but when they are defined
 * in the future it will require no code change.
 *
 * DR6_ACTIVE_LOW is also used as the init/reset value for DR6.
 */
#define DR6_ACTIVE_LOW  0xffff0ff0
#define DR6_VOLATILE    0x0001e80f
#define DR6_FIXED_1     (DR6_ACTIVE_LOW & ~DR6_VOLATILE)

#define DR7_BP_EN_MASK  0x000000ff
#define DR7_GE          (1 << 9)
#define DR7_GD          (1 << 13)
#define DR7_FIXED_1     0x00000400
#define DR7_VOLATILE    0xffff2bff

#define KVM_GUESTDBG_VALID_MASK \
        (KVM_GUESTDBG_ENABLE | \
        KVM_GUESTDBG_SINGLESTEP | \
        KVM_GUESTDBG_USE_HW_BP | \
        KVM_GUESTDBG_USE_SW_BP | \
        KVM_GUESTDBG_INJECT_BP | \
        KVM_GUESTDBG_INJECT_DB | \
        KVM_GUESTDBG_BLOCKIRQ)


#define PFERR_PRESENT_BIT 0
#define PFERR_WRITE_BIT 1
#define PFERR_USER_BIT 2
#define PFERR_RSVD_BIT 3
#define PFERR_FETCH_BIT 4
#define PFERR_PK_BIT 5
#define PFERR_SGX_BIT 15
#define PFERR_GUEST_FINAL_BIT 32
#define PFERR_GUEST_PAGE_BIT 33
#define PFERR_IMPLICIT_ACCESS_BIT 48

#define PFERR_PRESENT_MASK (1U << PFERR_PRESENT_BIT)
#define PFERR_WRITE_MASK (1U << PFERR_WRITE_BIT)
#define PFERR_USER_MASK (1U << PFERR_USER_BIT)
#define PFERR_RSVD_MASK (1U << PFERR_RSVD_BIT)
#define PFERR_FETCH_MASK (1U << PFERR_FETCH_BIT)
#define PFERR_PK_MASK (1U << PFERR_PK_BIT)
#define PFERR_SGX_MASK (1U << PFERR_SGX_BIT)
#define PFERR_GUEST_FINAL_MASK (1ULL << PFERR_GUEST_FINAL_BIT)
#define PFERR_GUEST_PAGE_MASK (1ULL << PFERR_GUEST_PAGE_BIT)
#define PFERR_IMPLICIT_ACCESS (1ULL << PFERR_IMPLICIT_ACCESS_BIT)

#define PFERR_NESTED_GUEST_PAGE (PFERR_GUEST_PAGE_MASK |        \
                                 PFERR_WRITE_MASK |             \
                                 PFERR_PRESENT_MASK)

/* apic attention bits */
#define KVM_APIC_CHECK_VAPIC    0
/*
 * The following bit is set with PV-EOI, unset on EOI.
 * We detect PV-EOI changes by guest by comparing
 * this bit with PV-EOI in guest memory.
 * See the implementation in apic_update_pv_eoi.
 */
#define KVM_APIC_PV_EOI_PENDING 1

struct kvm_kernel_irq_routing_entry;

/*
 * kvm_mmu_page_role tracks the properties of a shadow page (where shadow page
 * also includes TDP pages) to determine whether or not a page can be used in
 * the given MMU context.  This is a subset of the overall kvm_cpu_role to
 * minimize the size of kvm_memory_slot.arch.gfn_track, i.e. allows allocating
 * 2 bytes per gfn instead of 4 bytes per gfn.
 *
 * Upper-level shadow pages having gptes are tracked for write-protection via
 * gfn_track.  As above, gfn_track is a 16 bit counter, so KVM must not create
 * more than 2^16-1 upper-level shadow pages at a single gfn, otherwise
 * gfn_track will overflow and explosions will ensure.
 *
 * A unique shadow page (SP) for a gfn is created if and only if an existing SP
 * cannot be reused.  The ability to reuse a SP is tracked by its role, which
 * incorporates various mode bits and properties of the SP.  Roughly speaking,
 * the number of unique SPs that can theoretically be created is 2^n, where n
 * is the number of bits that are used to compute the role.
 *
 * But, even though there are 19 bits in the mask below, not all combinations
 * of modes and flags are possible:
 *
 *   - invalid shadow pages are not accounted, so the bits are effectively 18
 *
 *   - quadrant will only be used if has_4_byte_gpte=1 (non-PAE paging);
 *     execonly and ad_disabled are only used for nested EPT which has
 *     has_4_byte_gpte=0.  Therefore, 2 bits are always unused.
 *
 *   - the 4 bits of level are effectively limited to the values 2/3/4/5,
 *     as 4k SPs are not tracked (allowed to go unsync).  In addition non-PAE
 *     paging has exactly one upper level, making level completely redundant
 *     when has_4_byte_gpte=1.
 *
 *   - on top of this, smep_andnot_wp and smap_andnot_wp are only set if
 *     cr0_wp=0, therefore these three bits only give rise to 5 possibilities.
 *
 * Therefore, the maximum number of possible upper-level shadow pages for a
 * single gfn is a bit less than 2^13.
 */
union kvm_mmu_page_role {
        u32 word;
        struct {
                unsigned level:4;
                unsigned has_4_byte_gpte:1;
                unsigned quadrant:2;
                unsigned direct:1;
                unsigned access:3;
                unsigned invalid:1;
                unsigned efer_nx:1;
                unsigned cr0_wp:1;
                unsigned smep_andnot_wp:1;
                unsigned smap_andnot_wp:1;
                unsigned ad_disabled:1;
                unsigned guest_mode:1;
                unsigned passthrough:1;
                unsigned :5;

                /*
                 * This is left at the top of the word so that
                 * kvm_memslots_for_spte_role can extract it with a
                 * simple shift.  While there is room, give it a whole
                 * byte so it is also faster to load it from memory.
                 */
                unsigned smm:8;
        };
};

/*
 * kvm_mmu_extended_role complements kvm_mmu_page_role, tracking properties
 * relevant to the current MMU configuration.   When loading CR0, CR4, or EFER,
 * including on nested transitions, if nothing in the full role changes then
 * MMU re-configuration can be skipped. @valid bit is set on first usage so we
 * don't treat all-zero structure as valid data.
 *
 * The properties that are tracked in the extended role but not the page role
 * are for things that either (a) do not affect the validity of the shadow page
 * or (b) are indirectly reflected in the shadow page's role.  For example,
 * CR4.PKE only affects permission checks for software walks of the guest page
 * tables (because KVM doesn't support Protection Keys with shadow paging), and
 * CR0.PG, CR4.PAE, and CR4.PSE are indirectly reflected in role.level.
 *
 * Note, SMEP and SMAP are not redundant with sm*p_andnot_wp in the page role.
 * If CR0.WP=1, KVM can reuse shadow pages for the guest regardless of SMEP and
 * SMAP, but the MMU's permission checks for software walks need to be SMEP and
 * SMAP aware regardless of CR0.WP.
 */
union kvm_mmu_extended_role {
        u32 word;
        struct {
                unsigned int valid:1;
                unsigned int execonly:1;
                unsigned int cr4_pse:1;
                unsigned int cr4_pke:1;
                unsigned int cr4_smap:1;
                unsigned int cr4_smep:1;
                unsigned int cr4_la57:1;
                unsigned int efer_lma:1;
        };
};

union kvm_cpu_role {
        u64 as_u64;
        struct {
                union kvm_mmu_page_role base;
                union kvm_mmu_extended_role ext;
        };
};

struct kvm_rmap_head {
        unsigned long val;
};

struct kvm_pio_request {
        unsigned long linear_rip;
        unsigned long count;
        int in;
        int port;
        int size;
};

#define PT64_ROOT_MAX_LEVEL 5

struct rsvd_bits_validate {
        u64 rsvd_bits_mask[2][PT64_ROOT_MAX_LEVEL];
        u64 bad_mt_xwr;
};

struct kvm_mmu_root_info {
        gpa_t pgd;
        hpa_t hpa;
};

#define KVM_MMU_ROOT_INFO_INVALID \
        ((struct kvm_mmu_root_info) { .pgd = INVALID_PAGE, .hpa = INVALID_PAGE })

#define KVM_MMU_NUM_PREV_ROOTS 3

#define KVM_HAVE_MMU_RWLOCK

struct kvm_mmu_page;
struct kvm_page_fault;

/*
 * x86 supports 4 paging modes (5-level 64-bit, 4-level 64-bit, 3-level 32-bit,
 * and 2-level 32-bit).  The kvm_mmu structure abstracts the details of the
 * current mmu mode.
 */
struct kvm_mmu {
        unsigned long (*get_guest_pgd)(struct kvm_vcpu *vcpu);
        u64 (*get_pdptr)(struct kvm_vcpu *vcpu, int index);
        int (*page_fault)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault);
        void (*inject_page_fault)(struct kvm_vcpu *vcpu,
                                  struct x86_exception *fault);
        gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
                            gpa_t gva_or_gpa, u64 access,
                            struct x86_exception *exception);
        int (*sync_page)(struct kvm_vcpu *vcpu,
                         struct kvm_mmu_page *sp);
        void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa);
        struct kvm_mmu_root_info root;
        union kvm_cpu_role cpu_role;
        union kvm_mmu_page_role root_role;

        /*
        * The pkru_mask indicates if protection key checks are needed.  It
        * consists of 16 domains indexed by page fault error code bits [4:1],
        * with PFEC.RSVD replaced by ACC_USER_MASK from the page tables.
        * Each domain has 2 bits which are ANDed with AD and WD from PKRU.
        */
        u32 pkru_mask;

        struct kvm_mmu_root_info prev_roots[KVM_MMU_NUM_PREV_ROOTS];

        /*
         * Bitmap; bit set = permission fault
         * Byte index: page fault error code [4:1]
         * Bit index: pte permissions in ACC_* format
         */
        u8 permissions[16];

        u64 *pae_root;
        u64 *pml4_root;
        u64 *pml5_root;

        /*
         * check zero bits on shadow page table entries, these
         * bits include not only hardware reserved bits but also
         * the bits spte never used.
         */
        struct rsvd_bits_validate shadow_zero_check;

        struct rsvd_bits_validate guest_rsvd_check;

        u64 pdptrs[4]; /* pae */
};

struct kvm_tlb_range {
        u64 start_gfn;
        u64 pages;
};

enum pmc_type {
        KVM_PMC_GP = 0,
        KVM_PMC_FIXED,
};

struct kvm_pmc {
        enum pmc_type type;
        u8 idx;
        u64 counter;
        u64 eventsel;
        struct perf_event *perf_event;
        struct kvm_vcpu *vcpu;
        /*
         * eventsel value for general purpose counters,
         * ctrl value for fixed counters.
         */
        u64 current_config;
        bool is_paused;
        bool intr;
};

#define KVM_PMC_MAX_FIXED       3
struct kvm_pmu {
        unsigned nr_arch_gp_counters;
        unsigned nr_arch_fixed_counters;
        unsigned available_event_types;
        u64 fixed_ctr_ctrl;
        u64 fixed_ctr_ctrl_mask;
        u64 global_ctrl;
        u64 global_status;
        u64 counter_bitmask[2];
        u64 global_ctrl_mask;
        u64 global_ovf_ctrl_mask;
        u64 reserved_bits;
        u64 raw_event_mask;
        u8 version;
        struct kvm_pmc gp_counters[INTEL_PMC_MAX_GENERIC];
        struct kvm_pmc fixed_counters[KVM_PMC_MAX_FIXED];
        struct irq_work irq_work;
        DECLARE_BITMAP(reprogram_pmi, X86_PMC_IDX_MAX);
        DECLARE_BITMAP(all_valid_pmc_idx, X86_PMC_IDX_MAX);
        DECLARE_BITMAP(pmc_in_use, X86_PMC_IDX_MAX);

        u64 ds_area;
        u64 pebs_enable;
        u64 pebs_enable_mask;
        u64 pebs_data_cfg;
        u64 pebs_data_cfg_mask;

        /*
         * If a guest counter is cross-mapped to host counter with different
         * index, its PEBS capability will be temporarily disabled.
         *
         * The user should make sure that this mask is updated
         * after disabling interrupts and before perf_guest_get_msrs();
         */
        u64 host_cross_mapped_mask;

        /*
         * The gate to release perf_events not marked in
         * pmc_in_use only once in a vcpu time slice.
         */
        bool need_cleanup;

        /*
         * The total number of programmed perf_events and it helps to avoid
         * redundant check before cleanup if guest don't use vPMU at all.
         */
        u8 event_count;
};

struct kvm_pmu_ops;

enum {
        KVM_DEBUGREG_BP_ENABLED = 1,
        KVM_DEBUGREG_WONT_EXIT = 2,
};

struct kvm_mtrr_range {
        u64 base;
        u64 mask;
        struct list_head node;
};

struct kvm_mtrr {
        struct kvm_mtrr_range var_ranges[KVM_NR_VAR_MTRR];
        mtrr_type fixed_ranges[KVM_NR_FIXED_MTRR_REGION];
        u64 deftype;

        struct list_head head;
};

/* Hyper-V SynIC timer */
struct kvm_vcpu_hv_stimer {
        struct hrtimer timer;
        int index;
        union hv_stimer_config config;
        u64 count;
        u64 exp_time;
        struct hv_message msg;
        bool msg_pending;
};

/* Hyper-V synthetic interrupt controller (SynIC)*/
struct kvm_vcpu_hv_synic {
        u64 version;
        u64 control;
        u64 msg_page;
        u64 evt_page;
        atomic64_t sint[HV_SYNIC_SINT_COUNT];
        atomic_t sint_to_gsi[HV_SYNIC_SINT_COUNT];
        DECLARE_BITMAP(auto_eoi_bitmap, 256);
        DECLARE_BITMAP(vec_bitmap, 256);
        bool active;
        bool dont_zero_synic_pages;
};

/* Hyper-V per vcpu emulation context */
struct kvm_vcpu_hv {
        struct kvm_vcpu *vcpu;
        u32 vp_index;
        u64 hv_vapic;
        s64 runtime_offset;
        struct kvm_vcpu_hv_synic synic;
        struct kvm_hyperv_exit exit;
        struct kvm_vcpu_hv_stimer stimer[HV_SYNIC_STIMER_COUNT];
        DECLARE_BITMAP(stimer_pending_bitmap, HV_SYNIC_STIMER_COUNT);
        bool enforce_cpuid;
        struct {
                u32 features_eax; /* HYPERV_CPUID_FEATURES.EAX */
                u32 features_ebx; /* HYPERV_CPUID_FEATURES.EBX */
                u32 features_edx; /* HYPERV_CPUID_FEATURES.EDX */
                u32 enlightenments_eax; /* HYPERV_CPUID_ENLIGHTMENT_INFO.EAX */
                u32 enlightenments_ebx; /* HYPERV_CPUID_ENLIGHTMENT_INFO.EBX */
                u32 syndbg_cap_eax; /* HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX */
                u32 nested_eax; /* HYPERV_CPUID_NESTED_FEATURES.EAX */
                u32 nested_ebx; /* HYPERV_CPUID_NESTED_FEATURES.EBX */
        } cpuid_cache;
};

/* Xen HVM per vcpu emulation context */
struct kvm_vcpu_xen {
        u64 hypercall_rip;
        u32 current_runstate;
        u8 upcall_vector;
        struct gfn_to_pfn_cache vcpu_info_cache;
        struct gfn_to_pfn_cache vcpu_time_info_cache;
        struct gfn_to_pfn_cache runstate_cache;
        u64 last_steal;
        u64 runstate_entry_time;
        u64 runstate_times[4];
        unsigned long evtchn_pending_sel;
        u32 vcpu_id; /* The Xen / ACPI vCPU ID */
        u32 timer_virq;
        u64 timer_expires; /* In guest epoch */
        atomic_t timer_pending;
        struct hrtimer timer;
        int poll_evtchn;
        struct timer_list poll_timer;
};

struct kvm_queued_exception {
        bool pending;
        bool injected;
        bool has_error_code;
        u8 vector;
        u32 error_code;
        unsigned long payload;
        bool has_payload;
};

struct kvm_vcpu_arch {
        /*
         * rip and regs accesses must go through
         * kvm_{register,rip}_{read,write} functions.
         */
        unsigned long regs[NR_VCPU_REGS];
        u32 regs_avail;
        u32 regs_dirty;

        unsigned long cr0;
        unsigned long cr0_guest_owned_bits;
        unsigned long cr2;
        unsigned long cr3;
        unsigned long cr4;
        unsigned long cr4_guest_owned_bits;
        unsigned long cr4_guest_rsvd_bits;
        unsigned long cr8;
        u32 host_pkru;
        u32 pkru;
        u32 hflags;
        u64 efer;
        u64 apic_base;
        struct kvm_lapic *apic;    /* kernel irqchip context */
        bool load_eoi_exitmap_pending;
        DECLARE_BITMAP(ioapic_handled_vectors, 256);
        unsigned long apic_attention;
        int32_t apic_arb_prio;
        int mp_state;
        u64 ia32_misc_enable_msr;
        u64 smbase;
        u64 smi_count;
        bool at_instruction_boundary;
        bool tpr_access_reporting;
        bool xsaves_enabled;
        bool xfd_no_write_intercept;
        u64 ia32_xss;
        u64 microcode_version;
        u64 arch_capabilities;
        u64 perf_capabilities;

        /*
         * Paging state of the vcpu
         *
         * If the vcpu runs in guest mode with two level paging this still saves
         * the paging mode of the l1 guest. This context is always used to
         * handle faults.
         */
        struct kvm_mmu *mmu;

        /* Non-nested MMU for L1 */
        struct kvm_mmu root_mmu;

        /* L1 MMU when running nested */
        struct kvm_mmu guest_mmu;

        /*
         * Paging state of an L2 guest (used for nested npt)
         *
         * This context will save all necessary information to walk page tables
         * of an L2 guest. This context is only initialized for page table
         * walking and not for faulting since we never handle l2 page faults on
         * the host.
         */
        struct kvm_mmu nested_mmu;

        /*
         * Pointer to the mmu context currently used for
         * gva_to_gpa translations.
         */
        struct kvm_mmu *walk_mmu;

        struct kvm_mmu_memory_cache mmu_pte_list_desc_cache;
        struct kvm_mmu_memory_cache mmu_shadow_page_cache;
        struct kvm_mmu_memory_cache mmu_shadowed_info_cache;
        struct kvm_mmu_memory_cache mmu_page_header_cache;

        /*
         * QEMU userspace and the guest each have their own FPU state.
         * In vcpu_run, we switch between the user and guest FPU contexts.
         * While running a VCPU, the VCPU thread will have the guest FPU
         * context.
         *
         * Note that while the PKRU state lives inside the fpu registers,
         * it is switched out separately at VMENTER and VMEXIT time. The
         * "guest_fpstate" state here contains the guest FPU context, with the
         * host PRKU bits.
         */
        struct fpu_guest guest_fpu;

        u64 xcr0;
        u64 guest_supported_xcr0;

        struct kvm_pio_request pio;
        void *pio_data;
        void *sev_pio_data;
        unsigned sev_pio_count;

        u8 event_exit_inst_len;

        bool exception_from_userspace;

        /* Exceptions to be injected to the guest. */
        struct kvm_queued_exception exception;
        /* Exception VM-Exits to be synthesized to L1. */
        struct kvm_queued_exception exception_vmexit;

        struct kvm_queued_interrupt {
                bool injected;
                bool soft;
                u8 nr;
        } interrupt;

        int halt_request; /* real mode on Intel only */

        int cpuid_nent;
        struct kvm_cpuid_entry2 *cpuid_entries;
        u32 kvm_cpuid_base;

        u64 reserved_gpa_bits;
        int maxphyaddr;

        /* emulate context */

        struct x86_emulate_ctxt *emulate_ctxt;
        bool emulate_regs_need_sync_to_vcpu;
        bool emulate_regs_need_sync_from_vcpu;
        int (*complete_userspace_io)(struct kvm_vcpu *vcpu);

        gpa_t time;
        struct pvclock_vcpu_time_info hv_clock;
        unsigned int hw_tsc_khz;
        struct gfn_to_pfn_cache pv_time;
        /* set guest stopped flag in pvclock flags field */
        bool pvclock_set_guest_stopped_request;

        struct {
                u8 preempted;
                u64 msr_val;
                u64 last_steal;
                struct gfn_to_hva_cache cache;
        } st;

        u64 l1_tsc_offset;
        u64 tsc_offset; /* current tsc offset */
        u64 last_guest_tsc;
        u64 last_host_tsc;
        u64 tsc_offset_adjustment;
        u64 this_tsc_nsec;
        u64 this_tsc_write;
        u64 this_tsc_generation;
        bool tsc_catchup;
        bool tsc_always_catchup;
        s8 virtual_tsc_shift;
        u32 virtual_tsc_mult;
        u32 virtual_tsc_khz;
        s64 ia32_tsc_adjust_msr;
        u64 msr_ia32_power_ctl;
        u64 l1_tsc_scaling_ratio;
        u64 tsc_scaling_ratio; /* current scaling ratio */

        atomic_t nmi_queued;  /* unprocessed asynchronous NMIs */
        unsigned nmi_pending; /* NMI queued after currently running handler */
        bool nmi_injected;    /* Trying to inject an NMI this entry */
        bool smi_pending;    /* SMI queued after currently running handler */
        u8 handling_intr_from_guest;

        struct kvm_mtrr mtrr_state;
        u64 pat;

        unsigned switch_db_regs;
        unsigned long db[KVM_NR_DB_REGS];
        unsigned long dr6;
        unsigned long dr7;
        unsigned long eff_db[KVM_NR_DB_REGS];
        unsigned long guest_debug_dr7;
        u64 msr_platform_info;
        u64 msr_misc_features_enables;

        u64 mcg_cap;
        u64 mcg_status;
        u64 mcg_ctl;
        u64 mcg_ext_ctl;
        u64 *mce_banks;
        u64 *mci_ctl2_banks;

        /* Cache MMIO info */
        u64 mmio_gva;
        unsigned mmio_access;
        gfn_t mmio_gfn;
        u64 mmio_gen;

        struct kvm_pmu pmu;

        /* used for guest single stepping over the given code position */
        unsigned long singlestep_rip;

        bool hyperv_enabled;
        struct kvm_vcpu_hv *hyperv;
        struct kvm_vcpu_xen xen;

        cpumask_var_t wbinvd_dirty_mask;

        unsigned long last_retry_eip;
        unsigned long last_retry_addr;

        struct {
                bool halted;
                gfn_t gfns[ASYNC_PF_PER_VCPU];
                struct gfn_to_hva_cache data;
                u64 msr_en_val; /* MSR_KVM_ASYNC_PF_EN */
                u64 msr_int_val; /* MSR_KVM_ASYNC_PF_INT */
                u16 vec;
                u32 id;
                bool send_user_only;
                u32 host_apf_flags;
                bool delivery_as_pf_vmexit;
                bool pageready_pending;
        } apf;

        /* OSVW MSRs (AMD only) */
        struct {
                u64 length;
                u64 status;
        } osvw;

        struct {
                u64 msr_val;
                struct gfn_to_hva_cache data;
        } pv_eoi;

        u64 msr_kvm_poll_control;

        /*
         * Indicates the guest is trying to write a gfn that contains one or
         * more of the PTEs used to translate the write itself, i.e. the access
         * is changing its own translation in the guest page tables.  KVM exits
         * to userspace if emulation of the faulting instruction fails and this
         * flag is set, as KVM cannot make forward progress.
         *
         * If emulation fails for a write to guest page tables, KVM unprotects
         * (zaps) the shadow page for the target gfn and resumes the guest to
         * retry the non-emulatable instruction (on hardware).  Unprotecting the
         * gfn doesn't allow forward progress for a self-changing access because
         * doing so also zaps the translation for the gfn, i.e. retrying the
         * instruction will hit a !PRESENT fault, which results in a new shadow
         * page and sends KVM back to square one.
         */
        bool write_fault_to_shadow_pgtable;

        /* set at EPT violation at this point */
        unsigned long exit_qualification;

        /* pv related host specific info */
        struct {
                bool pv_unhalted;
        } pv;

        int pending_ioapic_eoi;
        int pending_external_vector;

        /* be preempted when it's in kernel-mode(cpl=0) */
        bool preempted_in_kernel;

        /* Flush the L1 Data cache for L1TF mitigation on VMENTER */
        bool l1tf_flush_l1d;

        /* Host CPU on which VM-entry was most recently attempted */
        int last_vmentry_cpu;

        /* AMD MSRC001_0015 Hardware Configuration */
        u64 msr_hwcr;

        /* pv related cpuid info */
        struct {
                /*
                 * value of the eax register in the KVM_CPUID_FEATURES CPUID
                 * leaf.
                 */
                u32 features;

                /*
                 * indicates whether pv emulation should be disabled if features
                 * are not present in the guest's cpuid
                 */
                bool enforce;
        } pv_cpuid;

        /* Protected Guests */
        bool guest_state_protected;

        /*
         * Set when PDPTS were loaded directly by the userspace without
         * reading the guest memory
         */
        bool pdptrs_from_userspace;

#if IS_ENABLED(CONFIG_HYPERV)
        hpa_t hv_root_tdp;
#endif
};

struct kvm_lpage_info {
        int disallow_lpage;
};

struct kvm_arch_memory_slot {
        struct kvm_rmap_head *rmap[KVM_NR_PAGE_SIZES];
        struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
        unsigned short *gfn_track[KVM_PAGE_TRACK_MAX];
};

/*
 * We use as the mode the number of bits allocated in the LDR for the
 * logical processor ID.  It happens that these are all powers of two.
 * This makes it is very easy to detect cases where the APICs are
 * configured for multiple modes; in that case, we cannot use the map and
 * hence cannot use kvm_irq_delivery_to_apic_fast either.
 */
#define KVM_APIC_MODE_XAPIC_CLUSTER          4
#define KVM_APIC_MODE_XAPIC_FLAT             8
#define KVM_APIC_MODE_X2APIC                16

struct kvm_apic_map {
        struct rcu_head rcu;
        u8 mode;
        u32 max_apic_id;
        union {
                struct kvm_lapic *xapic_flat_map[8];
                struct kvm_lapic *xapic_cluster_map[16][4];
        };
        struct kvm_lapic *phys_map[];
};

/* Hyper-V synthetic debugger (SynDbg)*/
struct kvm_hv_syndbg {
        struct {
                u64 control;
                u64 status;
                u64 send_page;
                u64 recv_page;
                u64 pending_page;
        } control;
        u64 options;
};

/* Current state of Hyper-V TSC page clocksource */
enum hv_tsc_page_status {
        /* TSC page was not set up or disabled */
        HV_TSC_PAGE_UNSET = 0,
        /* TSC page MSR was written by the guest, update pending */
        HV_TSC_PAGE_GUEST_CHANGED,
        /* TSC page update was triggered from the host side */
        HV_TSC_PAGE_HOST_CHANGED,
        /* TSC page was properly set up and is currently active  */
        HV_TSC_PAGE_SET,
        /* TSC page was set up with an inaccessible GPA */
        HV_TSC_PAGE_BROKEN,
};

/* Hyper-V emulation context */
struct kvm_hv {
        struct mutex hv_lock;
        u64 hv_guest_os_id;
        u64 hv_hypercall;
        u64 hv_tsc_page;
        enum hv_tsc_page_status hv_tsc_page_status;

        /* Hyper-v based guest crash (NT kernel bugcheck) parameters */
        u64 hv_crash_param[HV_X64_MSR_CRASH_PARAMS];
        u64 hv_crash_ctl;

        struct ms_hyperv_tsc_page tsc_ref;

        struct idr conn_to_evt;

        u64 hv_reenlightenment_control;
        u64 hv_tsc_emulation_control;
        u64 hv_tsc_emulation_status;

        /* How many vCPUs have VP index != vCPU index */
        atomic_t num_mismatched_vp_indexes;

        /*
         * How many SynICs use 'AutoEOI' feature
         * (protected by arch.apicv_update_lock)
         */
        unsigned int synic_auto_eoi_used;

        struct hv_partition_assist_pg *hv_pa_pg;
        struct kvm_hv_syndbg hv_syndbg;
};

struct msr_bitmap_range {
        u32 flags;
        u32 nmsrs;
        u32 base;
        unsigned long *bitmap;
};

/* Xen emulation context */
struct kvm_xen {
        u32 xen_version;
        bool long_mode;
        u8 upcall_vector;
        struct gfn_to_pfn_cache shinfo_cache;
        struct idr evtchn_ports;
        unsigned long poll_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)];
};

enum kvm_irqchip_mode {
        KVM_IRQCHIP_NONE,
        KVM_IRQCHIP_KERNEL,       /* created with KVM_CREATE_IRQCHIP */
        KVM_IRQCHIP_SPLIT,        /* created with KVM_CAP_SPLIT_IRQCHIP */
};

struct kvm_x86_msr_filter {
        u8 count;
        bool default_allow:1;
        struct msr_bitmap_range ranges[16];
};

enum kvm_apicv_inhibit {

        /********************************************************************/
        /* INHIBITs that are relevant to both Intel's APICv and AMD's AVIC. */
        /********************************************************************/

        /*
         * APIC acceleration is disabled by a module parameter
         * and/or not supported in hardware.
         */
        APICV_INHIBIT_REASON_DISABLE,

        /*
         * APIC acceleration is inhibited because AutoEOI feature is
         * being used by a HyperV guest.
         */
        APICV_INHIBIT_REASON_HYPERV,

        /*
         * APIC acceleration is inhibited because the userspace didn't yet
         * enable the kernel/split irqchip.
         */
        APICV_INHIBIT_REASON_ABSENT,

        /* APIC acceleration is inhibited because KVM_GUESTDBG_BLOCKIRQ
         * (out of band, debug measure of blocking all interrupts on this vCPU)
         * was enabled, to avoid AVIC/APICv bypassing it.
         */
        APICV_INHIBIT_REASON_BLOCKIRQ,

        /*
         * For simplicity, the APIC acceleration is inhibited
         * first time either APIC ID or APIC base are changed by the guest
         * from their reset values.
         */
        APICV_INHIBIT_REASON_APIC_ID_MODIFIED,
        APICV_INHIBIT_REASON_APIC_BASE_MODIFIED,

        /******************************************************/
        /* INHIBITs that are relevant only to the AMD's AVIC. */
        /******************************************************/

        /*
         * AVIC is inhibited on a vCPU because it runs a nested guest.
         *
         * This is needed because unlike APICv, the peers of this vCPU
         * cannot use the doorbell mechanism to signal interrupts via AVIC when
         * a vCPU runs nested.
         */
        APICV_INHIBIT_REASON_NESTED,

        /*
         * On SVM, the wait for the IRQ window is implemented with pending vIRQ,
         * which cannot be injected when the AVIC is enabled, thus AVIC
         * is inhibited while KVM waits for IRQ window.
         */
        APICV_INHIBIT_REASON_IRQWIN,

        /*
         * PIT (i8254) 're-inject' mode, relies on EOI intercept,
         * which AVIC doesn't support for edge triggered interrupts.
         */
        APICV_INHIBIT_REASON_PIT_REINJ,

        /*
         * AVIC is disabled because SEV doesn't support it.
         */
        APICV_INHIBIT_REASON_SEV,
};

struct kvm_arch {
        unsigned long n_used_mmu_pages;
        unsigned long n_requested_mmu_pages;
        unsigned long n_max_mmu_pages;
        unsigned int indirect_shadow_pages;
        u8 mmu_valid_gen;
        struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
        struct list_head active_mmu_pages;
        struct list_head zapped_obsolete_pages;
        struct list_head lpage_disallowed_mmu_pages;
        struct kvm_page_track_notifier_node mmu_sp_tracker;
        struct kvm_page_track_notifier_head track_notifier_head;
        /*
         * Protects marking pages unsync during page faults, as TDP MMU page
         * faults only take mmu_lock for read.  For simplicity, the unsync
         * pages lock is always taken when marking pages unsync regardless of
         * whether mmu_lock is held for read or write.
         */
        spinlock_t mmu_unsync_pages_lock;

        struct list_head assigned_dev_head;
        struct iommu_domain *iommu_domain;
        bool iommu_noncoherent;
#define __KVM_HAVE_ARCH_NONCOHERENT_DMA
        atomic_t noncoherent_dma_count;
#define __KVM_HAVE_ARCH_ASSIGNED_DEVICE
        atomic_t assigned_device_count;
        struct kvm_pic *vpic;
        struct kvm_ioapic *vioapic;
        struct kvm_pit *vpit;
        atomic_t vapics_in_nmi_mode;
        struct mutex apic_map_lock;
        struct kvm_apic_map __rcu *apic_map;
        atomic_t apic_map_dirty;

        /* Protects apic_access_memslot_enabled and apicv_inhibit_reasons */
        struct rw_semaphore apicv_update_lock;

        bool apic_access_memslot_enabled;
        unsigned long apicv_inhibit_reasons;

        gpa_t wall_clock;

        bool mwait_in_guest;
        bool hlt_in_guest;
        bool pause_in_guest;
        bool cstate_in_guest;

        unsigned long irq_sources_bitmap;
        s64 kvmclock_offset;

        /*
         * This also protects nr_vcpus_matched_tsc which is read from a
         * preemption-disabled region, so it must be a raw spinlock.
         */
        raw_spinlock_t tsc_write_lock;
        u64 last_tsc_nsec;
        u64 last_tsc_write;
        u32 last_tsc_khz;
        u64 last_tsc_offset;
        u64 cur_tsc_nsec;
        u64 cur_tsc_write;
        u64 cur_tsc_offset;
        u64 cur_tsc_generation;
        int nr_vcpus_matched_tsc;

        u32 default_tsc_khz;

        seqcount_raw_spinlock_t pvclock_sc;
        bool use_master_clock;
        u64 master_kernel_ns;
        u64 master_cycle_now;
        struct delayed_work kvmclock_update_work;
        struct delayed_work kvmclock_sync_work;

        struct kvm_xen_hvm_config xen_hvm_config;

        /* reads protected by irq_srcu, writes by irq_lock */
        struct hlist_head mask_notifier_list;

        struct kvm_hv hyperv;
        struct kvm_xen xen;

        bool backwards_tsc_observed;
        bool boot_vcpu_runs_old_kvmclock;
        u32 bsp_vcpu_id;

        u64 disabled_quirks;
        int cpu_dirty_logging_count;

        enum kvm_irqchip_mode irqchip_mode;
        u8 nr_reserved_ioapic_pins;

        bool disabled_lapic_found;

        bool x2apic_format;
        bool x2apic_broadcast_quirk_disabled;

        bool guest_can_read_msr_platform_info;
        bool exception_payload_enabled;

        bool triple_fault_event;

        bool bus_lock_detection_enabled;
        bool enable_pmu;

        u32 notify_window;
        u32 notify_vmexit_flags;
        /*
         * If exit_on_emulation_error is set, and the in-kernel instruction
         * emulator fails to emulate an instruction, allow userspace
         * the opportunity to look at it.
         */
        bool exit_on_emulation_error;

        /* Deflect RDMSR and WRMSR to user space when they trigger a #GP */
        u32 user_space_msr_mask;
        struct kvm_x86_msr_filter __rcu *msr_filter;

        u32 hypercall_exit_enabled;

        /* Guest can access the SGX PROVISIONKEY. */
        bool sgx_provisioning_allowed;

        struct kvm_pmu_event_filter __rcu *pmu_event_filter;
        struct task_struct *nx_lpage_recovery_thread;

#ifdef CONFIG_X86_64
        /*
         * Whether the TDP MMU is enabled for this VM. This contains a
         * snapshot of the TDP MMU module parameter from when the VM was
         * created and remains unchanged for the life of the VM. If this is
         * true, TDP MMU handler functions will run for various MMU
         * operations.
         */
        bool tdp_mmu_enabled;

        /*
         * List of struct kvm_mmu_pages being used as roots.
         * All struct kvm_mmu_pages in the list should have
         * tdp_mmu_page set.
         *
         * For reads, this list is protected by:
         *      the MMU lock in read mode + RCU or
         *      the MMU lock in write mode
         *
         * For writes, this list is protected by:
         *      the MMU lock in read mode + the tdp_mmu_pages_lock or
         *      the MMU lock in write mode
         *
         * Roots will remain in the list until their tdp_mmu_root_count
         * drops to zero, at which point the thread that decremented the
         * count to zero should removed the root from the list and clean
         * it up, freeing the root after an RCU grace period.
         */
        struct list_head tdp_mmu_roots;

        /*
         * List of struct kvmp_mmu_pages not being used as roots.
         * All struct kvm_mmu_pages in the list should have
         * tdp_mmu_page set and a tdp_mmu_root_count of 0.
         */
        struct list_head tdp_mmu_pages;

        /*
         * Protects accesses to the following fields when the MMU lock
         * is held in read mode:
         *  - tdp_mmu_roots (above)
         *  - tdp_mmu_pages (above)
         *  - the link field of struct kvm_mmu_pages used by the TDP MMU
         *  - lpage_disallowed_mmu_pages
         *  - the lpage_disallowed_link field of struct kvm_mmu_pages used
         *    by the TDP MMU
         * It is acceptable, but not necessary, to acquire this lock when
         * the thread holds the MMU lock in write mode.
         */
        spinlock_t tdp_mmu_pages_lock;
        struct workqueue_struct *tdp_mmu_zap_wq;
#endif /* CONFIG_X86_64 */

        /*
         * If set, at least one shadow root has been allocated. This flag
         * is used as one input when determining whether certain memslot
         * related allocations are necessary.
         */
        bool shadow_root_allocated;

#if IS_ENABLED(CONFIG_HYPERV)
        hpa_t   hv_root_tdp;
        spinlock_t hv_root_tdp_lock;
#endif
        /*
         * VM-scope maximum vCPU ID. Used to determine the size of structures
         * that increase along with the maximum vCPU ID, in which case, using
         * the global KVM_MAX_VCPU_IDS may lead to significant memory waste.
         */
        u32 max_vcpu_ids;

        bool disable_nx_huge_pages;

        /*
         * Memory caches used to allocate shadow pages when performing eager
         * page splitting. No need for a shadowed_info_cache since eager page
         * splitting only allocates direct shadow pages.
         *
         * Protected by kvm->slots_lock.
         */
        struct kvm_mmu_memory_cache split_shadow_page_cache;
        struct kvm_mmu_memory_cache split_page_header_cache;

        /*
         * Memory cache used to allocate pte_list_desc structs while splitting
         * huge pages. In the worst case, to split one huge page, 512
         * pte_list_desc structs are needed to add each lower level leaf sptep
         * to the rmap plus 1 to extend the parent_ptes rmap of the lower level
         * page table.
         *
         * Protected by kvm->slots_lock.
         */
#define SPLIT_DESC_CACHE_MIN_NR_OBJECTS (SPTE_ENT_PER_PAGE + 1)
        struct kvm_mmu_memory_cache split_desc_cache;
};

struct kvm_vm_stat {
        struct kvm_vm_stat_generic generic;
        u64 mmu_shadow_zapped;
        u64 mmu_pte_write;
        u64 mmu_pde_zapped;
        u64 mmu_flooded;
        u64 mmu_recycled;
        u64 mmu_cache_miss;
        u64 mmu_unsync;
        union {
                struct {
                        atomic64_t pages_4k;
                        atomic64_t pages_2m;
                        atomic64_t pages_1g;
                };
                atomic64_t pages[KVM_NR_PAGE_SIZES];
        };
        u64 nx_lpage_splits;
        u64 max_mmu_page_hash_collisions;
        u64 max_mmu_rmap_size;
};

struct kvm_vcpu_stat {
        struct kvm_vcpu_stat_generic generic;
        u64 pf_taken;
        u64 pf_fixed;
        u64 pf_emulate;
        u64 pf_spurious;
        u64 pf_fast;
        u64 pf_mmio_spte_created;
        u64 pf_guest;
        u64 tlb_flush;
        u64 invlpg;

        u64 exits;
        u64 io_exits;
        u64 mmio_exits;
        u64 signal_exits;
        u64 irq_window_exits;
        u64 nmi_window_exits;
        u64 l1d_flush;
        u64 halt_exits;
        u64 request_irq_exits;
        u64 irq_exits;
        u64 host_state_reload;
        u64 fpu_reload;
        u64 insn_emulation;
        u64 insn_emulation_fail;
        u64 hypercalls;
        u64 irq_injections;
        u64 nmi_injections;
        u64 req_event;
        u64 nested_run;
        u64 directed_yield_attempted;
        u64 directed_yield_successful;
        u64 preemption_reported;
        u64 preemption_other;
        u64 guest_mode;
        u64 notify_window_exits;
};

struct x86_instruction_info;

struct msr_data {
        bool host_initiated;
        u32 index;
        u64 data;
};

struct kvm_lapic_irq {
        u32 vector;
        u16 delivery_mode;
        u16 dest_mode;
        bool level;
        u16 trig_mode;
        u32 shorthand;
        u32 dest_id;
        bool msi_redir_hint;
};

static inline u16 kvm_lapic_irq_dest_mode(bool dest_mode_logical)
{
        return dest_mode_logical ? APIC_DEST_LOGICAL : APIC_DEST_PHYSICAL;
}

struct kvm_x86_ops {
        const char *name;

        int (*hardware_enable)(void);
        void (*hardware_disable)(void);
        void (*hardware_unsetup)(void);
        bool (*has_emulated_msr)(struct kvm *kvm, u32 index);
        void (*vcpu_after_set_cpuid)(struct kvm_vcpu *vcpu);

        unsigned int vm_size;
        int (*vm_init)(struct kvm *kvm);
        void (*vm_destroy)(struct kvm *kvm);

        /* Create, but do not attach this VCPU */
        int (*vcpu_precreate)(struct kvm *kvm);
        int (*vcpu_create)(struct kvm_vcpu *vcpu);
        void (*vcpu_free)(struct kvm_vcpu *vcpu);
        void (*vcpu_reset)(struct kvm_vcpu *vcpu, bool init_event);

        void (*prepare_switch_to_guest)(struct kvm_vcpu *vcpu);
        void (*vcpu_load)(struct kvm_vcpu *vcpu, int cpu);
        void (*vcpu_put)(struct kvm_vcpu *vcpu);

        void (*update_exception_bitmap)(struct kvm_vcpu *vcpu);
        int (*get_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
        int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr);
        u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg);
        void (*get_segment)(struct kvm_vcpu *vcpu,
                            struct kvm_segment *var, int seg);
        int (*get_cpl)(struct kvm_vcpu *vcpu);
        void (*set_segment)(struct kvm_vcpu *vcpu,
                            struct kvm_segment *var, int seg);
        void (*get_cs_db_l_bits)(struct kvm_vcpu *vcpu, int *db, int *l);
        void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
        void (*post_set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
        bool (*is_valid_cr4)(struct kvm_vcpu *vcpu, unsigned long cr0);
        void (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
        int (*set_efer)(struct kvm_vcpu *vcpu, u64 efer);
        void (*get_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
        void (*set_idt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
        void (*get_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
        void (*set_gdt)(struct kvm_vcpu *vcpu, struct desc_ptr *dt);
        void (*sync_dirty_debug_regs)(struct kvm_vcpu *vcpu);
        void (*set_dr7)(struct kvm_vcpu *vcpu, unsigned long value);
        void (*cache_reg)(struct kvm_vcpu *vcpu, enum kvm_reg reg);
        unsigned long (*get_rflags)(struct kvm_vcpu *vcpu);
        void (*set_rflags)(struct kvm_vcpu *vcpu, unsigned long rflags);
        bool (*get_if_flag)(struct kvm_vcpu *vcpu);

        void (*flush_tlb_all)(struct kvm_vcpu *vcpu);
        void (*flush_tlb_current)(struct kvm_vcpu *vcpu);
        int  (*tlb_remote_flush)(struct kvm *kvm);
        int  (*tlb_remote_flush_with_range)(struct kvm *kvm,
                        struct kvm_tlb_range *range);

        /*
         * Flush any TLB entries associated with the given GVA.
         * Does not need to flush GPA->HPA mappings.
         * Can potentially get non-canonical addresses through INVLPGs, which
         * the implementation may choose to ignore if appropriate.
         */
        void (*flush_tlb_gva)(struct kvm_vcpu *vcpu, gva_t addr);

        /*
         * Flush any TLB entries created by the guest.  Like tlb_flush_gva(),
         * does not need to flush GPA->HPA mappings.
         */
        void (*flush_tlb_guest)(struct kvm_vcpu *vcpu);

        int (*vcpu_pre_run)(struct kvm_vcpu *vcpu);
        enum exit_fastpath_completion (*vcpu_run)(struct kvm_vcpu *vcpu);
        int (*handle_exit)(struct kvm_vcpu *vcpu,
                enum exit_fastpath_completion exit_fastpath);
        int (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
        void (*update_emulated_instruction)(struct kvm_vcpu *vcpu);
        void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
        u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu);
        void (*patch_hypercall)(struct kvm_vcpu *vcpu,
                                unsigned char *hypercall_addr);
        void (*inject_irq)(struct kvm_vcpu *vcpu, bool reinjected);
        void (*inject_nmi)(struct kvm_vcpu *vcpu);
        void (*inject_exception)(struct kvm_vcpu *vcpu);
        void (*cancel_injection)(struct kvm_vcpu *vcpu);
        int (*interrupt_allowed)(struct kvm_vcpu *vcpu, bool for_injection);
        int (*nmi_allowed)(struct kvm_vcpu *vcpu, bool for_injection);
        bool (*get_nmi_mask)(struct kvm_vcpu *vcpu);
        void (*set_nmi_mask)(struct kvm_vcpu *vcpu, bool masked);
        void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
        void (*enable_irq_window)(struct kvm_vcpu *vcpu);
        void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
        bool (*check_apicv_inhibit_reasons)(enum kvm_apicv_inhibit reason);
        void (*refresh_apicv_exec_ctrl)(struct kvm_vcpu *vcpu);
        void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
        void (*hwapic_isr_update)(int isr);
        bool (*guest_apic_has_interrupt)(struct kvm_vcpu *vcpu);
        void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
        void (*set_virtual_apic_mode)(struct kvm_vcpu *vcpu);
        void (*set_apic_access_page_addr)(struct kvm_vcpu *vcpu);
        void (*deliver_interrupt)(struct kvm_lapic *apic, int delivery_mode,
                                  int trig_mode, int vector);
        int (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
        int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
        int (*set_identity_map_addr)(struct kvm *kvm, u64 ident_addr);
        u8 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);

        void (*load_mmu_pgd)(struct kvm_vcpu *vcpu, hpa_t root_hpa,
                             int root_level);

        bool (*has_wbinvd_exit)(void);

        u64 (*get_l2_tsc_offset)(struct kvm_vcpu *vcpu);
        u64 (*get_l2_tsc_multiplier)(struct kvm_vcpu *vcpu);
        void (*write_tsc_offset)(struct kvm_vcpu *vcpu, u64 offset);
        void (*write_tsc_multiplier)(struct kvm_vcpu *vcpu, u64 multiplier);

        /*
         * Retrieve somewhat arbitrary exit information.  Intended to
         * be used only from within tracepoints or error paths.
         */
        void (*get_exit_info)(struct kvm_vcpu *vcpu, u32 *reason,
                              u64 *info1, u64 *info2,
                              u32 *exit_int_info, u32 *exit_int_info_err_code);

        int (*check_intercept)(struct kvm_vcpu *vcpu,
                               struct x86_instruction_info *info,
                               enum x86_intercept_stage stage,
                               struct x86_exception *exception);
        void (*handle_exit_irqoff)(struct kvm_vcpu *vcpu);

        void (*request_immediate_exit)(struct kvm_vcpu *vcpu);

        void (*sched_in)(struct kvm_vcpu *kvm, int cpu);

        /*
         * Size of the CPU's dirty log buffer, i.e. VMX's PML buffer.  A zero
         * value indicates CPU dirty logging is unsupported or disabled.
         */
        int cpu_dirty_log_size;
        void (*update_cpu_dirty_logging)(struct kvm_vcpu *vcpu);

        const struct kvm_x86_nested_ops *nested_ops;

        void (*vcpu_blocking)(struct kvm_vcpu *vcpu);
        void (*vcpu_unblocking)(struct kvm_vcpu *vcpu);

        int (*pi_update_irte)(struct kvm *kvm, unsigned int host_irq,
                              uint32_t guest_irq, bool set);
        void (*pi_start_assignment)(struct kvm *kvm);
        void (*apicv_post_state_restore)(struct kvm_vcpu *vcpu);
        bool (*dy_apicv_has_pending_interrupt)(struct kvm_vcpu *vcpu);

        int (*set_hv_timer)(struct kvm_vcpu *vcpu, u64 guest_deadline_tsc,
                            bool *expired);
        void (*cancel_hv_timer)(struct kvm_vcpu *vcpu);

        void (*setup_mce)(struct kvm_vcpu *vcpu);

        int (*smi_allowed)(struct kvm_vcpu *vcpu, bool for_injection);
        int (*enter_smm)(struct kvm_vcpu *vcpu, char *smstate);
        int (*leave_smm)(struct kvm_vcpu *vcpu, const char *smstate);
        void (*enable_smi_window)(struct kvm_vcpu *vcpu);

        int (*mem_enc_ioctl)(struct kvm *kvm, void __user *argp);
        int (*mem_enc_register_region)(struct kvm *kvm, struct kvm_enc_region *argp);
        int (*mem_enc_unregister_region)(struct kvm *kvm, struct kvm_enc_region *argp);
        int (*vm_copy_enc_context_from)(struct kvm *kvm, unsigned int source_fd);
        int (*vm_move_enc_context_from)(struct kvm *kvm, unsigned int source_fd);
        void (*guest_memory_reclaimed)(struct kvm *kvm);

        int (*get_msr_feature)(struct kvm_msr_entry *entry);

        bool (*can_emulate_instruction)(struct kvm_vcpu *vcpu, int emul_type,
                                        void *insn, int insn_len);

        bool (*apic_init_signal_blocked)(struct kvm_vcpu *vcpu);
        int (*enable_direct_tlbflush)(struct kvm_vcpu *vcpu);

        void (*migrate_timers)(struct kvm_vcpu *vcpu);
        void (*msr_filter_changed)(struct kvm_vcpu *vcpu);
        int (*complete_emulated_msr)(struct kvm_vcpu *vcpu, int err);

        void (*vcpu_deliver_sipi_vector)(struct kvm_vcpu *vcpu, u8 vector);

        /*
         * Returns vCPU specific APICv inhibit reasons
         */
        unsigned long (*vcpu_get_apicv_inhibit_reasons)(struct kvm_vcpu *vcpu);
};

struct kvm_x86_nested_ops {
        void (*leave_nested)(struct kvm_vcpu *vcpu);
        bool (*is_exception_vmexit)(struct kvm_vcpu *vcpu, u8 vector,
                                    u32 error_code);
        int (*check_events)(struct kvm_vcpu *vcpu);
        bool (*has_events)(struct kvm_vcpu *vcpu);
        void (*triple_fault)(struct kvm_vcpu *vcpu);
        int (*get_state)(struct kvm_vcpu *vcpu,
                         struct kvm_nested_state __user *user_kvm_nested_state,
                         unsigned user_data_size);
        int (*set_state)(struct kvm_vcpu *vcpu,
                         struct kvm_nested_state __user *user_kvm_nested_state,
                         struct kvm_nested_state *kvm_state);
        bool (*get_nested_state_pages)(struct kvm_vcpu *vcpu);
        int (*write_log_dirty)(struct kvm_vcpu *vcpu, gpa_t l2_gpa);

        int (*enable_evmcs)(struct kvm_vcpu *vcpu,
                            uint16_t *vmcs_version);
        uint16_t (*get_evmcs_version)(struct kvm_vcpu *vcpu);
};

struct kvm_x86_init_ops {
        int (*cpu_has_kvm_support)(void);
        int (*disabled_by_bios)(void);
        int (*check_processor_compatibility)(void);
        int (*hardware_setup)(void);
        unsigned int (*handle_intel_pt_intr)(void);

        struct kvm_x86_ops *runtime_ops;
        struct kvm_pmu_ops *pmu_ops;
};

struct kvm_arch_async_pf {
        u32 token;
        gfn_t gfn;
        unsigned long cr3;
        bool direct_map;
};

extern u32 __read_mostly kvm_nr_uret_msrs;
extern u64 __read_mostly host_efer;
extern bool __read_mostly allow_smaller_maxphyaddr;
extern bool __read_mostly enable_apicv;
extern struct kvm_x86_ops kvm_x86_ops;

#define KVM_X86_OP(func) \
        DECLARE_STATIC_CALL(kvm_x86_##func, *(((struct kvm_x86_ops *)0)->func));
#define KVM_X86_OP_OPTIONAL KVM_X86_OP
#define KVM_X86_OP_OPTIONAL_RET0 KVM_X86_OP
#include <asm/kvm-x86-ops.h>

#define __KVM_HAVE_ARCH_VM_ALLOC
static inline struct kvm *kvm_arch_alloc_vm(void)
{
        return __vmalloc(kvm_x86_ops.vm_size, GFP_KERNEL_ACCOUNT | __GFP_ZERO);
}

#define __KVM_HAVE_ARCH_VM_FREE
void kvm_arch_free_vm(struct kvm *kvm);

#define __KVM_HAVE_ARCH_FLUSH_REMOTE_TLB
static inline int kvm_arch_flush_remote_tlb(struct kvm *kvm)
{
        if (kvm_x86_ops.tlb_remote_flush &&
            !static_call(kvm_x86_tlb_remote_flush)(kvm))
                return 0;
        else
                return -ENOTSUPP;
}

#define kvm_arch_pmi_in_guest(vcpu) \
        ((vcpu) && (vcpu)->arch.handling_intr_from_guest)

void __init kvm_mmu_x86_module_init(void);
int kvm_mmu_vendor_module_init(void);
void kvm_mmu_vendor_module_exit(void);

void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
int kvm_mmu_create(struct kvm_vcpu *vcpu);
int kvm_mmu_init_vm(struct kvm *kvm);
void kvm_mmu_uninit_vm(struct kvm *kvm);

void kvm_mmu_after_set_cpuid(struct kvm_vcpu *vcpu);
void kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm,
                                      const struct kvm_memory_slot *memslot,
                                      int start_level);
void kvm_mmu_slot_try_split_huge_pages(struct kvm *kvm,
                                       const struct kvm_memory_slot *memslot,
                                       int target_level);
void kvm_mmu_try_split_huge_pages(struct kvm *kvm,
                                  const struct kvm_memory_slot *memslot,
                                  u64 start, u64 end,
                                  int target_level);
void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm,
                                   const struct kvm_memory_slot *memslot);
void kvm_mmu_slot_leaf_clear_dirty(struct kvm *kvm,
                                   const struct kvm_memory_slot *memslot);
void kvm_mmu_zap_all(struct kvm *kvm);
void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm, u64 gen);
void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned long kvm_nr_mmu_pages);

int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);

int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
                          const void *val, int bytes);

struct kvm_irq_mask_notifier {
        void (*func)(struct kvm_irq_mask_notifier *kimn, bool masked);
        int irq;
        struct hlist_node link;
};

void kvm_register_irq_mask_notifier(struct kvm *kvm, int irq,
                                    struct kvm_irq_mask_notifier *kimn);
void kvm_unregister_irq_mask_notifier(struct kvm *kvm, int irq,
                                      struct kvm_irq_mask_notifier *kimn);
void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned irqchip, unsigned pin,
                             bool mask);

extern bool tdp_enabled;

u64 vcpu_tsc_khz(struct kvm_vcpu *vcpu);

/*
 * EMULTYPE_NO_DECODE - Set when re-emulating an instruction (after completing
 *                      userspace I/O) to indicate that the emulation context
 *                      should be reused as is, i.e. skip initialization of
 *                      emulation context, instruction fetch and decode.
 *
 * EMULTYPE_TRAP_UD - Set when emulating an intercepted #UD from hardware.
 *                    Indicates that only select instructions (tagged with
 *                    EmulateOnUD) should be emulated (to minimize the emulator
 *                    attack surface).  See also EMULTYPE_TRAP_UD_FORCED.
 *
 * EMULTYPE_SKIP - Set when emulating solely to skip an instruction, i.e. to
 *                 decode the instruction length.  For use *only* by
 *                 kvm_x86_ops.skip_emulated_instruction() implementations if
 *                 EMULTYPE_COMPLETE_USER_EXIT is not set.
 *
 * EMULTYPE_ALLOW_RETRY_PF - Set when the emulator should resume the guest to
 *                           retry native execution under certain conditions,
 *                           Can only be set in conjunction with EMULTYPE_PF.
 *
 * EMULTYPE_TRAP_UD_FORCED - Set when emulating an intercepted #UD that was
 *                           triggered by KVM's magic "force emulation" prefix,
 *                           which is opt in via module param (off by default).
 *                           Bypasses EmulateOnUD restriction despite emulating
 *                           due to an intercepted #UD (see EMULTYPE_TRAP_UD).
 *                           Used to test the full emulator from userspace.
 *
 * EMULTYPE_VMWARE_GP - Set when emulating an intercepted #GP for VMware
 *                      backdoor emulation, which is opt in via module param.
 *                      VMware backdoor emulation handles select instructions
 *                      and reinjects the #GP for all other cases.
 *
 * EMULTYPE_PF - Set when emulating MMIO by way of an intercepted #PF, in which
 *               case the CR2/GPA value pass on the stack is valid.
 *
 * EMULTYPE_COMPLETE_USER_EXIT - Set when the emulator should update interruptibility
 *                               state and inject single-step #DBs after skipping
 *                               an instruction (after completing userspace I/O).
 */
#define EMULTYPE_NO_DECODE          (1 << 0)
#define EMULTYPE_TRAP_UD            (1 << 1)
#define EMULTYPE_SKIP               (1 << 2)
#define EMULTYPE_ALLOW_RETRY_PF     (1 << 3)
#define EMULTYPE_TRAP_UD_FORCED     (1 << 4)
#define EMULTYPE_VMWARE_GP          (1 << 5)
#define EMULTYPE_PF                 (1 << 6)
#define EMULTYPE_COMPLETE_USER_EXIT (1 << 7)

int kvm_emulate_instruction(struct kvm_vcpu *vcpu, int emulation_type);
int kvm_emulate_instruction_from_buffer(struct kvm_vcpu *vcpu,
                                        void *insn, int insn_len);
void __kvm_prepare_emulation_failure_exit(struct kvm_vcpu *vcpu,
                                          u64 *data, u8 ndata);
void kvm_prepare_emulation_failure_exit(struct kvm_vcpu *vcpu);

void kvm_enable_efer_bits(u64);
bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer);
int __kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data, bool host_initiated);
int kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data);
int kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data);
int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu);
int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu);
int kvm_emulate_as_nop(struct kvm_vcpu *vcpu);
int kvm_emulate_invd(struct kvm_vcpu *vcpu);
int kvm_emulate_mwait(struct kvm_vcpu *vcpu);
int kvm_handle_invalid_op(struct kvm_vcpu *vcpu);
int kvm_emulate_monitor(struct kvm_vcpu *vcpu);

int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in);
int kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
int kvm_emulate_halt(struct kvm_vcpu *vcpu);
int kvm_emulate_halt_noskip(struct kvm_vcpu *vcpu);
int kvm_emulate_ap_reset_hold(struct kvm_vcpu *vcpu);
int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu);

void kvm_get_segment(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg);
int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector, int seg);
void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector);

int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
                    int reason, bool has_error_code, u32 error_code);

void kvm_post_set_cr0(struct kvm_vcpu *vcpu, unsigned long old_cr0, unsigned long cr0);
void kvm_post_set_cr4(struct kvm_vcpu *vcpu, unsigned long old_cr4, unsigned long cr4);
int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0);
int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8);
int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val);
void kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val);
unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu);
void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw);
int kvm_emulate_xsetbv(struct kvm_vcpu *vcpu);

int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr);
int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr);

unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu);
void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
int kvm_emulate_rdpmc(struct kvm_vcpu *vcpu);

void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
void kvm_queue_exception_p(struct kvm_vcpu *vcpu, unsigned nr, unsigned long payload);
void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr);
void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);
void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault);
void kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu,
                                    struct x86_exception *fault);
bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);
bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr);

static inline int __kvm_irq_line_state(unsigned long *irq_state,
                                       int irq_source_id, int level)
{
        /* Logical OR for level trig interrupt */
        if (level)
                __set_bit(irq_source_id, irq_state);
        else
                __clear_bit(irq_source_id, irq_state);

        return !!(*irq_state);
}

#define KVM_MMU_ROOT_CURRENT            BIT(0)
#define KVM_MMU_ROOT_PREVIOUS(i)        BIT(1+i)
#define KVM_MMU_ROOTS_ALL               (~0UL)

int kvm_pic_set_irq(struct kvm_pic *pic, int irq, int irq_source_id, int level);
void kvm_pic_clear_all(struct kvm_pic *pic, int irq_source_id);

void kvm_inject_nmi(struct kvm_vcpu *vcpu);

void kvm_update_dr7(struct kvm_vcpu *vcpu);

int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn);
void kvm_mmu_free_roots(struct kvm *kvm, struct kvm_mmu *mmu,
                        ulong roots_to_free);
void kvm_mmu_free_guest_mode_roots(struct kvm *kvm, struct kvm_mmu *mmu);
gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
                              struct x86_exception *exception);
gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
                               struct x86_exception *exception);
gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
                               struct x86_exception *exception);
gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
                                struct x86_exception *exception);

bool kvm_apicv_activated(struct kvm *kvm);
bool kvm_vcpu_apicv_activated(struct kvm_vcpu *vcpu);
void kvm_vcpu_update_apicv(struct kvm_vcpu *vcpu);
void __kvm_set_or_clear_apicv_inhibit(struct kvm *kvm,
                                      enum kvm_apicv_inhibit reason, bool set);
void kvm_set_or_clear_apicv_inhibit(struct kvm *kvm,
                                    enum kvm_apicv_inhibit reason, bool set);

static inline void kvm_set_apicv_inhibit(struct kvm *kvm,
                                         enum kvm_apicv_inhibit reason)
{
        kvm_set_or_clear_apicv_inhibit(kvm, reason, true);
}

static inline void kvm_clear_apicv_inhibit(struct kvm *kvm,
                                           enum kvm_apicv_inhibit reason)
{
        kvm_set_or_clear_apicv_inhibit(kvm, reason, false);
}

int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);

int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
                       void *insn, int insn_len);
void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
void kvm_mmu_invalidate_gva(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
                            gva_t gva, hpa_t root_hpa);
void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid);
void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd);

void kvm_configure_mmu(bool enable_tdp, int tdp_forced_root_level,
                       int tdp_max_root_level, int tdp_huge_page_level);

static inline u16 kvm_read_ldt(void)
{
        u16 ldt;
        asm("sldt %0" : "=g"(ldt));
        return ldt;
}

static inline void kvm_load_ldt(u16 sel)
{
        asm("lldt %0" : : "rm"(sel));
}

#ifdef CONFIG_X86_64
static inline unsigned long read_msr(unsigned long msr)
{
        u64 value;

        rdmsrl(msr, value);
        return value;
}
#endif

static inline void kvm_inject_gp(struct kvm_vcpu *vcpu, u32 error_code)
{
        kvm_queue_exception_e(vcpu, GP_VECTOR, error_code);
}

#define TSS_IOPB_BASE_OFFSET 0x66
#define TSS_BASE_SIZE 0x68
#define TSS_IOPB_SIZE (65536 / 8)
#define TSS_REDIRECTION_SIZE (256 / 8)
#define RMODE_TSS_SIZE                                                  \
        (TSS_BASE_SIZE + TSS_REDIRECTION_SIZE + TSS_IOPB_SIZE + 1)

enum {
        TASK_SWITCH_CALL = 0,
        TASK_SWITCH_IRET = 1,
        TASK_SWITCH_JMP = 2,
        TASK_SWITCH_GATE = 3,
};

#define HF_GIF_MASK             (1 << 0)
#define HF_NMI_MASK             (1 << 3)
#define HF_IRET_MASK            (1 << 4)
#define HF_GUEST_MASK           (1 << 5) /* VCPU is in guest-mode */
#define HF_SMM_MASK             (1 << 6)
#define HF_SMM_INSIDE_NMI_MASK  (1 << 7)

#define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
#define KVM_ADDRESS_SPACE_NUM 2

#define kvm_arch_vcpu_memslots_id(vcpu) ((vcpu)->arch.hflags & HF_SMM_MASK ? 1 : 0)
#define kvm_memslots_for_spte_role(kvm, role) __kvm_memslots(kvm, (role).smm)

#define KVM_ARCH_WANT_MMU_NOTIFIER

int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v);
int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
int kvm_cpu_has_extint(struct kvm_vcpu *v);
int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event);

int kvm_pv_send_ipi(struct kvm *kvm, unsigned long ipi_bitmap_low,
                    unsigned long ipi_bitmap_high, u32 min,
                    unsigned long icr, int op_64_bit);

int kvm_add_user_return_msr(u32 msr);
int kvm_find_user_return_msr(u32 msr);
int kvm_set_user_return_msr(unsigned index, u64 val, u64 mask);

static inline bool kvm_is_supported_user_return_msr(u32 msr)
{
        return kvm_find_user_return_msr(msr) >= 0;
}

u64 kvm_scale_tsc(u64 tsc, u64 ratio);
u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc);
u64 kvm_calc_nested_tsc_offset(u64 l1_offset, u64 l2_offset, u64 l2_multiplier);
u64 kvm_calc_nested_tsc_multiplier(u64 l1_multiplier, u64 l2_multiplier);

unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu);
bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip);

void kvm_make_scan_ioapic_request(struct kvm *kvm);
void kvm_make_scan_ioapic_request_mask(struct kvm *kvm,
                                       unsigned long *vcpu_bitmap);

bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
                                     struct kvm_async_pf *work);
void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
                                 struct kvm_async_pf *work);
void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
                               struct kvm_async_pf *work);
void kvm_arch_async_page_present_queued(struct kvm_vcpu *vcpu);
bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu);
extern bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn);

int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu);
int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err);
void __kvm_request_immediate_exit(struct kvm_vcpu *vcpu);

void __user *__x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa,
                                     u32 size);
bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu);
bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu);

bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq,
                             struct kvm_vcpu **dest_vcpu);

void kvm_set_msi_irq(struct kvm *kvm, struct kvm_kernel_irq_routing_entry *e,
                     struct kvm_lapic_irq *irq);

static inline bool kvm_irq_is_postable(struct kvm_lapic_irq *irq)
{
        /* We can only post Fixed and LowPrio IRQs */
        return (irq->delivery_mode == APIC_DM_FIXED ||
                irq->delivery_mode == APIC_DM_LOWEST);
}

static inline void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
{
        static_call_cond(kvm_x86_vcpu_blocking)(vcpu);
}

static inline void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
{
        static_call_cond(kvm_x86_vcpu_unblocking)(vcpu);
}

static inline int kvm_cpu_get_apicid(int mps_cpu)
{
#ifdef CONFIG_X86_LOCAL_APIC
        return default_cpu_present_to_apicid(mps_cpu);
#else
        WARN_ON_ONCE(1);
        return BAD_APICID;
#endif
}

#define put_smstate(type, buf, offset, val)                      \
        *(type *)((buf) + (offset) - 0x7e00) = val

#define GET_SMSTATE(type, buf, offset)          \
        (*(type *)((buf) + (offset) - 0x7e00))

int kvm_cpu_dirty_log_size(void);

int memslot_rmap_alloc(struct kvm_memory_slot *slot, unsigned long npages);

#define KVM_CLOCK_VALID_FLAGS                                           \
        (KVM_CLOCK_TSC_STABLE | KVM_CLOCK_REALTIME | KVM_CLOCK_HOST_TSC)

#define KVM_X86_VALID_QUIRKS                    \
        (KVM_X86_QUIRK_LINT0_REENABLED |        \
         KVM_X86_QUIRK_CD_NW_CLEARED |          \
         KVM_X86_QUIRK_LAPIC_MMIO_HOLE |        \
         KVM_X86_QUIRK_OUT_7E_INC_RIP |         \
         KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT |   \
         KVM_X86_QUIRK_FIX_HYPERCALL_INSN |     \
         KVM_X86_QUIRK_MWAIT_NEVER_UD_FAULTS)

#endif /* _ASM_X86_KVM_HOST_H */