/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * This header defines architecture specific interfaces, x86 version
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#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/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 <asm/pvclock-abi.h>
#include <asm/desc.h>
#include <asm/mtrr.h>
#include <asm/msr-index.h>
#include <asm/asm.h>

#define KVM_MAX_VCPUS 255
#define KVM_SOFT_MAX_VCPUS 160
#define KVM_USER_MEM_SLOTS 509
/* memory slots that are not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 3
#define KVM_MEM_SLOTS_NUM (KVM_USER_MEM_SLOTS + KVM_PRIVATE_MEM_SLOTS)

#define KVM_PIO_PAGE_OFFSET 1
#define KVM_COALESCED_MMIO_PAGE_OFFSET 2

#define KVM_IRQCHIP_NUM_PINS  KVM_IOAPIC_NUM_PINS

#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 CR3_L_MODE_RESERVED_BITS 0xFFFFFF0000000000ULL
#define CR3_PCID_INVD            BIT_64(63)
#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_VMXE | X86_CR4_SMAP))

#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)



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

#define UNMAPPED_GVA (~(gpa_t)0)

/* KVM Hugepage definitions for x86 */
#define KVM_NR_PAGE_SIZES       3
#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)

static inline gfn_t gfn_to_index(gfn_t gfn, gfn_t base_gfn, int level)
{
        /* KVM_HPAGE_GFN_SHIFT(PT_PAGE_TABLE_LEVEL) must be 0. */
        return (gfn >> KVM_HPAGE_GFN_SHIFT(level)) -
                (base_gfn >> KVM_HPAGE_GFN_SHIFT(level));
}

#define KVM_PERMILLE_MMU_PAGES 20
#define KVM_MIN_ALLOC_MMU_PAGES 64
#define KVM_MMU_HASH_SHIFT 10
#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 80
#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 = 0,
        VCPU_REGS_RCX = 1,
        VCPU_REGS_RDX = 2,
        VCPU_REGS_RBX = 3,
        VCPU_REGS_RSP = 4,
        VCPU_REGS_RBP = 5,
        VCPU_REGS_RSI = 6,
        VCPU_REGS_RDI = 7,
#ifdef CONFIG_X86_64
        VCPU_REGS_R8 = 8,
        VCPU_REGS_R9 = 9,
        VCPU_REGS_R10 = 10,
        VCPU_REGS_R11 = 11,
        VCPU_REGS_R12 = 12,
        VCPU_REGS_R13 = 13,
        VCPU_REGS_R14 = 14,
        VCPU_REGS_R15 = 15,
#endif
        VCPU_REGS_RIP,
        NR_VCPU_REGS
};

enum kvm_reg_ex {
        VCPU_EXREG_PDPTR = NR_VCPU_REGS,
        VCPU_EXREG_CR3,
        VCPU_EXREG_RFLAGS,
        VCPU_EXREG_SEGMENTS,
};

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,
};

#include <asm/kvm_emulate.h>

#define KVM_NR_MEM_OBJS 40

#define KVM_NR_DB_REGS  4

#define DR6_BD          (1 << 13)
#define DR6_BS          (1 << 14)
#define DR6_RTM         (1 << 16)
#define DR6_FIXED_1     0xfffe0ff0
#define DR6_INIT        0xffff0ff0
#define DR6_VOLATILE    0x0001e00f

#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 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_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)

/* 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

/*
 * We don't want allocation failures within the mmu code, so we preallocate
 * enough memory for a single page fault in a cache.
 */
struct kvm_mmu_memory_cache {
        int nobjs;
        void *objects[KVM_NR_MEM_OBJS];
};

/*
 * kvm_mmu_page_role, below, is defined as:
 *
 *   bits 0:3 - total guest paging levels (2-4, or zero for real mode)
 *   bits 4:7 - page table level for this shadow (1-4)
 *   bits 8:9 - page table quadrant for 2-level guests
 *   bit   16 - direct mapping of virtual to physical mapping at gfn
 *              used for real mode and two-dimensional paging
 *   bits 17:19 - common access permissions for all ptes in this shadow page
 */
union kvm_mmu_page_role {
        unsigned word;
        struct {
                unsigned level:4;
                unsigned cr4_pae:1;
                unsigned quadrant:2;
                unsigned pad_for_nice_hex_output:6;
                unsigned direct:1;
                unsigned access:3;
                unsigned invalid:1;
                unsigned nxe:1;
                unsigned cr0_wp:1;
                unsigned smep_andnot_wp:1;
                unsigned smap_andnot_wp:1;
        };
};

struct kvm_mmu_page {
        struct list_head link;
        struct hlist_node hash_link;

        /*
         * The following two entries are used to key the shadow page in the
         * hash table.
         */
        gfn_t gfn;
        union kvm_mmu_page_role role;

        u64 *spt;
        /* hold the gfn of each spte inside spt */
        gfn_t *gfns;
        bool unsync;
        int root_count;          /* Currently serving as active root */
        unsigned int unsync_children;
        unsigned long parent_ptes;      /* Reverse mapping for parent_pte */

        /* The page is obsolete if mmu_valid_gen != kvm->arch.mmu_valid_gen.  */
        unsigned long mmu_valid_gen;

        DECLARE_BITMAP(unsync_child_bitmap, 512);

#ifdef CONFIG_X86_32
        /*
         * Used out of the mmu-lock to avoid reading spte values while an
         * update is in progress; see the comments in __get_spte_lockless().
         */
        int clear_spte_count;
#endif

        /* Number of writes since the last time traversal visited this page.  */
        int write_flooding_count;
};

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

/*
 * x86 supports 3 paging modes (4-level 64-bit, 3-level 64-bit, and 2-level
 * 32-bit).  The kvm_mmu structure abstracts the details of the current mmu
 * mode.
 */
struct kvm_mmu {
        void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long root);
        unsigned long (*get_cr3)(struct kvm_vcpu *vcpu);
        u64 (*get_pdptr)(struct kvm_vcpu *vcpu, int index);
        int (*page_fault)(struct kvm_vcpu *vcpu, gva_t gva, u32 err,
                          bool prefault);
        void (*inject_page_fault)(struct kvm_vcpu *vcpu,
                                  struct x86_exception *fault);
        gpa_t (*gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t gva, u32 access,
                            struct x86_exception *exception);
        gpa_t (*translate_gpa)(struct kvm_vcpu *vcpu, gpa_t gpa, u32 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);
        void (*update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
                           u64 *spte, const void *pte);
        hpa_t root_hpa;
        int root_level;
        int shadow_root_level;
        union kvm_mmu_page_role base_role;
        bool direct_map;

        /*
         * 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 *lm_root;
        u64 rsvd_bits_mask[2][4];
        u64 bad_mt_xwr;

        /*
         * Bitmap: bit set = last pte in walk
         * index[0:1]: level (zero-based)
         * index[2]: pte.ps
         */
        u8 last_pte_bitmap;

        bool nx;

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

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;
};

struct kvm_pmu {
        unsigned nr_arch_gp_counters;
        unsigned nr_arch_fixed_counters;
        unsigned available_event_types;
        u64 fixed_ctr_ctrl;
        u64 global_ctrl;
        u64 global_status;
        u64 global_ovf_ctrl;
        u64 counter_bitmask[2];
        u64 global_ctrl_mask;
        u64 reserved_bits;
        u8 version;
        struct kvm_pmc gp_counters[INTEL_PMC_MAX_GENERIC];
        struct kvm_pmc fixed_counters[INTEL_PMC_MAX_FIXED];
        struct irq_work irq_work;
        u64 reprogram_pmi;
};

enum {
        KVM_DEBUGREG_BP_ENABLED = 1,
        KVM_DEBUGREG_WONT_EXIT = 2,
        KVM_DEBUGREG_RELOAD = 4,
};

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 cr8;
        u32 hflags;
        u64 efer;
        u64 apic_base;
        struct kvm_lapic *apic;    /* kernel irqchip context */
        unsigned long apic_attention;
        int32_t apic_arb_prio;
        int mp_state;
        u64 ia32_misc_enable_msr;
        bool tpr_access_reporting;
        u64 ia32_xss;

        /*
         * 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;

        /*
         * Paging state of an L2 guest (used for nested npt)
         *
         * This context will save all necessary information to walk page tables
         * of the 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_page_cache;
        struct kvm_mmu_memory_cache mmu_page_header_cache;

        struct fpu guest_fpu;
        bool eager_fpu;
        u64 xcr0;
        u64 guest_supported_xcr0;
        u32 guest_xstate_size;

        struct kvm_pio_request pio;
        void *pio_data;

        u8 event_exit_inst_len;

        struct kvm_queued_exception {
                bool pending;
                bool has_error_code;
                bool reinject;
                u8 nr;
                u32 error_code;
        } exception;

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

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

        int cpuid_nent;
        struct kvm_cpuid_entry2 cpuid_entries[KVM_MAX_CPUID_ENTRIES];

        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_hva_cache pv_time;
        bool pv_time_enabled;
        /* set guest stopped flag in pvclock flags field */
        bool pvclock_set_guest_stopped_request;

        struct {
                u64 msr_val;
                u64 last_steal;
                u64 accum_steal;
                struct gfn_to_hva_cache stime;
                struct kvm_steal_time steal;
        } st;

        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;

        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 */

        struct mtrr_state_type 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 mcg_cap;
        u64 mcg_status;
        u64 mcg_ctl;
        u64 *mce_banks;

        /* Cache MMIO info */
        u64 mmio_gva;
        unsigned 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;

        /* fields used by HYPER-V emulation */
        u64 hv_vapic;

        cpumask_var_t wbinvd_dirty_mask;

        unsigned long last_retry_eip;
        unsigned long last_retry_addr;

        struct {
                bool halted;
                gfn_t gfns[roundup_pow_of_two(ASYNC_PF_PER_VCPU)];
                struct gfn_to_hva_cache data;
                u64 msr_val;
                u32 id;
                bool send_user_only;
        } apf;

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

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

        /*
         * Indicate whether the access faults on its page table in guest
         * which is set when fix page fault and used to detect unhandeable
         * instruction.
         */
        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;
};

struct kvm_lpage_info {
        int write_count;
};

struct kvm_arch_memory_slot {
        unsigned long *rmap[KVM_NR_PAGE_SIZES];
        struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
};

/*
 * 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;
        struct kvm_lapic *phys_map[256];
        /* first index is cluster id second is cpu id in a cluster */
        struct kvm_lapic *logical_map[16][16];
};

struct kvm_arch {
        unsigned int n_used_mmu_pages;
        unsigned int n_requested_mmu_pages;
        unsigned int n_max_mmu_pages;
        unsigned int indirect_shadow_pages;
        unsigned long mmu_valid_gen;
        struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
        /*
         * Hash table of struct kvm_mmu_page.
         */
        struct list_head active_mmu_pages;
        struct list_head zapped_obsolete_pages;

        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;
        struct kvm_pic *vpic;
        struct kvm_ioapic *vioapic;
        struct kvm_pit *vpit;
        int vapics_in_nmi_mode;
        struct mutex apic_map_lock;
        struct kvm_apic_map *apic_map;

        unsigned int tss_addr;
        bool apic_access_page_done;

        gpa_t wall_clock;

        bool ept_identity_pagetable_done;
        gpa_t ept_identity_map_addr;

        unsigned long irq_sources_bitmap;
        s64 kvmclock_offset;
        raw_spinlock_t tsc_write_lock;
        u64 last_tsc_nsec;
        u64 last_tsc_write;
        u32 last_tsc_khz;
        u64 cur_tsc_nsec;
        u64 cur_tsc_write;
        u64 cur_tsc_offset;
        u64 cur_tsc_generation;
        int nr_vcpus_matched_tsc;

        spinlock_t pvclock_gtod_sync_lock;
        bool use_master_clock;
        u64 master_kernel_ns;
        cycle_t 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;

        /* fields used by HYPER-V emulation */
        u64 hv_guest_os_id;
        u64 hv_hypercall;
        u64 hv_tsc_page;

        #ifdef CONFIG_KVM_MMU_AUDIT
        int audit_point;
        #endif

        bool boot_vcpu_runs_old_kvmclock;
};

struct kvm_vm_stat {
        u32 mmu_shadow_zapped;
        u32 mmu_pte_write;
        u32 mmu_pte_updated;
        u32 mmu_pde_zapped;
        u32 mmu_flooded;
        u32 mmu_recycled;
        u32 mmu_cache_miss;
        u32 mmu_unsync;
        u32 remote_tlb_flush;
        u32 lpages;
};

struct kvm_vcpu_stat {
        u32 pf_fixed;
        u32 pf_guest;
        u32 tlb_flush;
        u32 invlpg;

        u32 exits;
        u32 io_exits;
        u32 mmio_exits;
        u32 signal_exits;
        u32 irq_window_exits;
        u32 nmi_window_exits;
        u32 halt_exits;
        u32 halt_successful_poll;
        u32 halt_wakeup;
        u32 request_irq_exits;
        u32 irq_exits;
        u32 host_state_reload;
        u32 efer_reload;
        u32 fpu_reload;
        u32 insn_emulation;
        u32 insn_emulation_fail;
        u32 hypercalls;
        u32 irq_injections;
        u32 nmi_injections;
};

struct x86_instruction_info;

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

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

struct kvm_x86_ops {
        int (*cpu_has_kvm_support)(void);          /* __init */
        int (*disabled_by_bios)(void);             /* __init */
        int (*hardware_enable)(void);
        void (*hardware_disable)(void);
        void (*check_processor_compatibility)(void *rtn);
        int (*hardware_setup)(void);               /* __init */
        void (*hardware_unsetup)(void);            /* __exit */
        bool (*cpu_has_accelerated_tpr)(void);
        void (*cpuid_update)(struct kvm_vcpu *vcpu);

        /* Create, but do not attach this VCPU */
        struct kvm_vcpu *(*vcpu_create)(struct kvm *kvm, unsigned id);
        void (*vcpu_free)(struct kvm_vcpu *vcpu);
        void (*vcpu_reset)(struct kvm_vcpu *vcpu);

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

        void (*update_db_bp_intercept)(struct kvm_vcpu *vcpu);
        int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);
        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 (*decache_cr0_guest_bits)(struct kvm_vcpu *vcpu);
        void (*decache_cr3)(struct kvm_vcpu *vcpu);
        void (*decache_cr4_guest_bits)(struct kvm_vcpu *vcpu);
        void (*set_cr0)(struct kvm_vcpu *vcpu, unsigned long cr0);
        void (*set_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);
        int (*set_cr4)(struct kvm_vcpu *vcpu, unsigned long cr4);
        void (*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);
        u64 (*get_dr6)(struct kvm_vcpu *vcpu);
        void (*set_dr6)(struct kvm_vcpu *vcpu, unsigned long value);
        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);
        void (*fpu_activate)(struct kvm_vcpu *vcpu);
        void (*fpu_deactivate)(struct kvm_vcpu *vcpu);

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

        void (*run)(struct kvm_vcpu *vcpu);
        int (*handle_exit)(struct kvm_vcpu *vcpu);
        void (*skip_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 (*set_irq)(struct kvm_vcpu *vcpu);
        void (*set_nmi)(struct kvm_vcpu *vcpu);
        void (*queue_exception)(struct kvm_vcpu *vcpu, unsigned nr,
                                bool has_error_code, u32 error_code,
                                bool reinject);
        void (*cancel_injection)(struct kvm_vcpu *vcpu);
        int (*interrupt_allowed)(struct kvm_vcpu *vcpu);
        int (*nmi_allowed)(struct kvm_vcpu *vcpu);
        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);
        int (*vm_has_apicv)(struct kvm *kvm);
        void (*hwapic_irr_update)(struct kvm_vcpu *vcpu, int max_irr);
        void (*hwapic_isr_update)(struct kvm *kvm, int isr);
        void (*load_eoi_exitmap)(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
        void (*set_virtual_x2apic_mode)(struct kvm_vcpu *vcpu, bool set);
        void (*set_apic_access_page_addr)(struct kvm_vcpu *vcpu, hpa_t hpa);
        void (*deliver_posted_interrupt)(struct kvm_vcpu *vcpu, int vector);
        void (*sync_pir_to_irr)(struct kvm_vcpu *vcpu);
        int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
        int (*get_tdp_level)(void);
        u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
        int (*get_lpage_level)(void);
        bool (*rdtscp_supported)(void);
        bool (*invpcid_supported)(void);
        void (*adjust_tsc_offset)(struct kvm_vcpu *vcpu, s64 adjustment, bool host);

        void (*set_tdp_cr3)(struct kvm_vcpu *vcpu, unsigned long cr3);

        void (*set_supported_cpuid)(u32 func, struct kvm_cpuid_entry2 *entry);

        bool (*has_wbinvd_exit)(void);

        void (*set_tsc_khz)(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale);
        u64 (*read_tsc_offset)(struct kvm_vcpu *vcpu);
        void (*write_tsc_offset)(struct kvm_vcpu *vcpu, u64 offset);

        u64 (*compute_tsc_offset)(struct kvm_vcpu *vcpu, u64 target_tsc);
        u64 (*read_l1_tsc)(struct kvm_vcpu *vcpu, u64 host_tsc);

        void (*get_exit_info)(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2);

        int (*check_intercept)(struct kvm_vcpu *vcpu,
                               struct x86_instruction_info *info,
                               enum x86_intercept_stage stage);
        void (*handle_external_intr)(struct kvm_vcpu *vcpu);
        bool (*mpx_supported)(void);
        bool (*xsaves_supported)(void);

        int (*check_nested_events)(struct kvm_vcpu *vcpu, bool external_intr);

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

        /*
         * Arch-specific dirty logging hooks. These hooks are only supposed to
         * be valid if the specific arch has hardware-accelerated dirty logging
         * mechanism. Currently only for PML on VMX.
         *
         *  - slot_enable_log_dirty:
         *      called when enabling log dirty mode for the slot.
         *  - slot_disable_log_dirty:
         *      called when disabling log dirty mode for the slot.
         *      also called when slot is created with log dirty disabled.
         *  - flush_log_dirty:
         *      called before reporting dirty_bitmap to userspace.
         *  - enable_log_dirty_pt_masked:
         *      called when reenabling log dirty for the GFNs in the mask after
         *      corresponding bits are cleared in slot->dirty_bitmap.
         */
        void (*slot_enable_log_dirty)(struct kvm *kvm,
                                      struct kvm_memory_slot *slot);
        void (*slot_disable_log_dirty)(struct kvm *kvm,
                                       struct kvm_memory_slot *slot);
        void (*flush_log_dirty)(struct kvm *kvm);
        void (*enable_log_dirty_pt_masked)(struct kvm *kvm,
                                           struct kvm_memory_slot *slot,
                                           gfn_t offset, unsigned long mask);
};

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

extern struct kvm_x86_ops *kvm_x86_ops;

static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
                                           s64 adjustment)
{
        kvm_x86_ops->adjust_tsc_offset(vcpu, adjustment, false);
}

static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment)
{
        kvm_x86_ops->adjust_tsc_offset(vcpu, adjustment, true);
}

int kvm_mmu_module_init(void);
void kvm_mmu_module_exit(void);

void kvm_mmu_destroy(struct kvm_vcpu *vcpu);
int kvm_mmu_create(struct kvm_vcpu *vcpu);
void kvm_mmu_setup(struct kvm_vcpu *vcpu);
void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
                u64 dirty_mask, u64 nx_mask, u64 x_mask);

void kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm,
                                      struct kvm_memory_slot *memslot);
void kvm_mmu_zap_collapsible_sptes(struct kvm *kvm,
                                        struct kvm_memory_slot *memslot);
void kvm_mmu_slot_leaf_clear_dirty(struct kvm *kvm,
                                   struct kvm_memory_slot *memslot);
void kvm_mmu_slot_largepage_remove_write_access(struct kvm *kvm,
                                        struct kvm_memory_slot *memslot);
void kvm_mmu_slot_set_dirty(struct kvm *kvm,
                            struct kvm_memory_slot *memslot);
void kvm_mmu_clear_dirty_pt_masked(struct kvm *kvm,
                                   struct kvm_memory_slot *slot,
                                   gfn_t gfn_offset, unsigned long mask);
void kvm_mmu_zap_all(struct kvm *kvm);
void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm);
unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);

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

int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
                          const void *val, int bytes);
u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn);

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);

/* control of guest tsc rate supported? */
extern bool kvm_has_tsc_control;
/* minimum supported tsc_khz for guests */
extern u32  kvm_min_guest_tsc_khz;
/* maximum supported tsc_khz for guests */
extern u32  kvm_max_guest_tsc_khz;

enum emulation_result {
        EMULATE_DONE,         /* no further processing */
        EMULATE_USER_EXIT,    /* kvm_run ready for userspace exit */
        EMULATE_FAIL,         /* can't emulate this instruction */
};

#define EMULTYPE_NO_DECODE          (1 << 0)
#define EMULTYPE_TRAP_UD            (1 << 1)
#define EMULTYPE_SKIP               (1 << 2)
#define EMULTYPE_RETRY              (1 << 3)
#define EMULTYPE_NO_REEXECUTE       (1 << 4)
int x86_emulate_instruction(struct kvm_vcpu *vcpu, unsigned long cr2,
                            int emulation_type, void *insn, int insn_len);

static inline int emulate_instruction(struct kvm_vcpu *vcpu,
                        int emulation_type)
{
        return x86_emulate_instruction(vcpu, 0, emulation_type, NULL, 0);
}

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 msr_index, u64 *data);
int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr);

struct x86_emulate_ctxt;

int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port);
void kvm_emulate_cpuid(struct kvm_vcpu *vcpu);
int kvm_emulate_halt(struct kvm_vcpu *vcpu);
int kvm_vcpu_halt(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);

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);
int 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);
void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l);
int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr);

int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata);
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);
bool kvm_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_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);
int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
                            gfn_t gfn, void *data, int offset, int len,
                            u32 access);
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);
}

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);

int fx_init(struct kvm_vcpu *vcpu);

void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
                       const u8 *new, int bytes);
int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn);
int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva);
void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
int kvm_mmu_load(struct kvm_vcpu *vcpu);
void kvm_mmu_unload(struct kvm_vcpu *vcpu);
void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access,
                           struct x86_exception *exception);
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);

int kvm_emulate_hypercall(struct kvm_vcpu *vcpu);

int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t gva, u32 error_code,
                       void *insn, int insn_len);
void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva);
void kvm_mmu_new_cr3(struct kvm_vcpu *vcpu);

void kvm_enable_tdp(void);
void kvm_disable_tdp(void);

static inline gpa_t translate_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access,
                                  struct x86_exception *exception)
{
        return gpa;
}

static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
{
        struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);

        return (struct kvm_mmu_page *)page_private(page);
}

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 u32 get_rdx_init_val(void)
{
        return 0x600; /* P6 family */
}

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

static inline u64 get_canonical(u64 la)
{
        return ((int64_t)la << 16) >> 16;
}

static inline bool is_noncanonical_address(u64 la)
{
#ifdef CONFIG_X86_64
        return get_canonical(la) != la;
#else
        return false;
#endif
}

#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_HIF_MASK             (1 << 1)
#define HF_VINTR_MASK           (1 << 2)
#define HF_NMI_MASK             (1 << 3)
#define HF_IRET_MASK            (1 << 4)
#define HF_GUEST_MASK           (1 << 5) /* VCPU is in guest-mode */

/*
 * Hardware virtualization extension instructions may fault if a
 * reboot turns off virtualization while processes are running.
 * Trap the fault and ignore the instruction if that happens.
 */
asmlinkage void kvm_spurious_fault(void);

#define ____kvm_handle_fault_on_reboot(insn, cleanup_insn)      \
        "666: " insn "\n\t" \
        "668: \n\t"                           \
        ".pushsection .fixup, \"ax\" \n" \
        "667: \n\t" \
        cleanup_insn "\n\t"                   \
        "cmpb $0, kvm_rebooting \n\t"         \
        "jne 668b \n\t"                       \
        __ASM_SIZE(push) " $666b \n\t"        \
        "call kvm_spurious_fault \n\t"        \
        ".popsection \n\t" \
        _ASM_EXTABLE(666b, 667b)

#define __kvm_handle_fault_on_reboot(insn)              \
        ____kvm_handle_fault_on_reboot(insn, "")

#define KVM_ARCH_WANT_MMU_NOTIFIER
int kvm_unmap_hva(struct kvm *kvm, unsigned long hva);
int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end);
int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
int kvm_cpu_has_injectable_intr(struct kvm_vcpu *v);
int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu);
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);
void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu);
void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
                                           unsigned long address);

void kvm_define_shared_msr(unsigned index, u32 msr);
int kvm_set_shared_msr(unsigned index, u64 val, u64 mask);

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_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);
bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu);
extern bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn);

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

int kvm_is_in_guest(void);

void kvm_pmu_init(struct kvm_vcpu *vcpu);
void kvm_pmu_destroy(struct kvm_vcpu *vcpu);
void kvm_pmu_reset(struct kvm_vcpu *vcpu);
void kvm_pmu_cpuid_update(struct kvm_vcpu *vcpu);
bool kvm_pmu_msr(struct kvm_vcpu *vcpu, u32 msr);
int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
int kvm_pmu_check_pmc(struct kvm_vcpu *vcpu, unsigned pmc);
int kvm_pmu_read_pmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data);
void kvm_handle_pmu_event(struct kvm_vcpu *vcpu);
void kvm_deliver_pmi(struct kvm_vcpu *vcpu);

#endif /* _ASM_X86_KVM_HOST_H */