kvm_host.h

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#ifndef __KVM_HOST_H
#define __KVM_HOST_H

/*
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 */

#include <linux/types.h>
#include <linux/hardirq.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/bug.h>
#include <linux/mm.h>
#include <linux/mmu_notifier.h>
#include <linux/preempt.h>
#include <linux/msi.h>
#include <linux/slab.h>
#include <linux/rcupdate.h>
#include <linux/ratelimit.h>
#include <linux/err.h>
#include <asm/signal.h>

#include <linux/kvm.h>
#include <linux/kvm_para.h>

#include <linux/kvm_types.h>

#include <asm/kvm_host.h>

#ifndef KVM_MMIO_SIZE
#define KVM_MMIO_SIZE 8
#endif

/*
 * The bit 16 ~ bit 31 of kvm_memory_region::flags are internally used
 * in kvm, other bits are visible for userspace which are defined in
 * include/linux/kvm_h.
 */
#define KVM_MEMSLOT_INVALID (1UL << 16)

/* Two fragments for cross MMIO pages. */
#define KVM_MAX_MMIO_FRAGMENTS  2

/*
 * For the normal pfn, the highest 12 bits should be zero,
 * so we can mask these bits to indicate the error.
 */
#define KVM_PFN_ERR_MASK    (0xfffULL << 52)

#define KVM_PFN_ERR_FAULT   (KVM_PFN_ERR_MASK)
#define KVM_PFN_ERR_HWPOISON    (KVM_PFN_ERR_MASK + 1)
#define KVM_PFN_ERR_BAD     (KVM_PFN_ERR_MASK + 2)
#define KVM_PFN_ERR_RO_FAULT    (KVM_PFN_ERR_MASK + 3)

static inline bool is_error_pfn(pfn_t pfn)
{
    return !!(pfn & KVM_PFN_ERR_MASK);
}

static inline bool is_noslot_pfn(pfn_t pfn)
{
    return pfn == KVM_PFN_ERR_BAD;
}

static inline bool is_invalid_pfn(pfn_t pfn)
{
    return !is_noslot_pfn(pfn) && is_error_pfn(pfn);
}

#define KVM_HVA_ERR_BAD     (PAGE_OFFSET)
#define KVM_HVA_ERR_RO_BAD  (PAGE_OFFSET + PAGE_SIZE)

static inline bool kvm_is_error_hva(unsigned long addr)
{
    return addr >= PAGE_OFFSET;
}

#define KVM_ERR_PTR_BAD_PAGE    (ERR_PTR(-ENOENT))

static inline bool is_error_page(struct page *page)
{
    return IS_ERR(page);
}

/*
 * vcpu->requests bit members
 */
#define KVM_REQ_TLB_FLUSH          0
#define KVM_REQ_MIGRATE_TIMER      1
#define KVM_REQ_REPORT_TPR_ACCESS  2
#define KVM_REQ_MMU_RELOAD         3
#define KVM_REQ_TRIPLE_FAULT       4
#define KVM_REQ_PENDING_TIMER      5
#define KVM_REQ_UNHALT             6
#define KVM_REQ_MMU_SYNC           7
#define KVM_REQ_CLOCK_UPDATE       8
#define KVM_REQ_KICK               9
#define KVM_REQ_DEACTIVATE_FPU    10
#define KVM_REQ_EVENT             11
#define KVM_REQ_APF_HALT          12
#define KVM_REQ_STEAL_UPDATE      13
#define KVM_REQ_NMI               14
#define KVM_REQ_IMMEDIATE_EXIT    15
#define KVM_REQ_PMU               16
#define KVM_REQ_PMI               17

#define KVM_USERSPACE_IRQ_SOURCE_ID     0
#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID    1

struct kvm;
struct kvm_vcpu;
extern struct kmem_cache *kvm_vcpu_cache;

struct kvm_io_range {
    gpa_t addr;
    int len;
    struct kvm_io_device *dev;
};

#define NR_IOBUS_DEVS 1000

struct kvm_io_bus {
    int                   dev_count;
    struct kvm_io_range range[];
};

enum kvm_bus {
    KVM_MMIO_BUS,
    KVM_PIO_BUS,
    KVM_NR_BUSES
};

int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
             int len, const void *val);
int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, int len,
            void *val);
int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
                int len, struct kvm_io_device *dev);
int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
                  struct kvm_io_device *dev);

#ifdef CONFIG_KVM_ASYNC_PF
struct kvm_async_pf {
    struct work_struct work;
    struct list_head link;
    struct list_head queue;
    struct kvm_vcpu *vcpu;
    struct mm_struct *mm;
    gva_t gva;
    unsigned long addr;
    struct kvm_arch_async_pf arch;
    struct page *page;
    bool done;
};

void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu);
void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu);
int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
               struct kvm_arch_async_pf *arch);
int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
#endif

enum {
    OUTSIDE_GUEST_MODE,
    IN_GUEST_MODE,
    EXITING_GUEST_MODE,
    READING_SHADOW_PAGE_TABLES,
};

/*
 * Sometimes a large or cross-page mmio needs to be broken up into separate
 * exits for userspace servicing.
 */
struct kvm_mmio_fragment {
    gpa_t gpa;
    void *data;
    unsigned len;
};

struct kvm_vcpu {
    struct kvm *kvm;
#ifdef CONFIG_PREEMPT_NOTIFIERS
    struct preempt_notifier preempt_notifier;
#endif
    int cpu;
    int vcpu_id;
    int srcu_idx;
    int mode;
    unsigned long requests;
    unsigned long guest_debug;

    struct mutex mutex;
    struct kvm_run *run;

    int fpu_active;
    int guest_fpu_loaded, guest_xcr0_loaded;
    wait_queue_head_t wq;
    struct pid *pid;
    int sigset_active;
    sigset_t sigset;
    struct kvm_vcpu_stat stat;

#ifdef CONFIG_HAS_IOMEM
    int mmio_needed;
    int mmio_read_completed;
    int mmio_is_write;
    int mmio_cur_fragment;
    int mmio_nr_fragments;
    struct kvm_mmio_fragment mmio_fragments[KVM_MAX_MMIO_FRAGMENTS];
#endif

#ifdef CONFIG_KVM_ASYNC_PF
    struct {
        u32 queued;
        struct list_head queue;
        struct list_head done;
        spinlock_t lock;
    } async_pf;
#endif

#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
    /*
     * Cpu relax intercept or pause loop exit optimization
     * in_spin_loop: set when a vcpu does a pause loop exit
     *  or cpu relax intercepted.
     * dy_eligible: indicates whether vcpu is eligible for directed yield.
     */
    struct {
        bool in_spin_loop;
        bool dy_eligible;
    } spin_loop;
#endif
    struct kvm_vcpu_arch arch;
};

static inline int kvm_vcpu_exiting_guest_mode(struct kvm_vcpu *vcpu)
{
    return cmpxchg(&vcpu->mode, IN_GUEST_MODE, EXITING_GUEST_MODE);
}

/*
 * Some of the bitops functions do not support too long bitmaps.
 * This number must be determined not to exceed such limits.
 */
#define KVM_MEM_MAX_NR_PAGES ((1UL << 31) - 1)

struct kvm_memory_slot {
    gfn_t base_gfn;
    unsigned long npages;
    unsigned long flags;
    unsigned long *dirty_bitmap;
    struct kvm_arch_memory_slot arch;
    unsigned long userspace_addr;
    int user_alloc;
    int id;
};

static inline unsigned long kvm_dirty_bitmap_bytes(struct kvm_memory_slot *memslot)
{
    return ALIGN(memslot->npages, BITS_PER_LONG) / 8;
}

struct kvm_kernel_irq_routing_entry {
    u32 gsi;
    u32 type;
    int (*set)(struct kvm_kernel_irq_routing_entry *e,
           struct kvm *kvm, int irq_source_id, int level);
    union {
        struct {
            unsigned irqchip;
            unsigned pin;
        } irqchip;
        struct msi_msg msi;
    };
    struct hlist_node link;
};

#ifdef __KVM_HAVE_IOAPIC

struct kvm_irq_routing_table {
    int chip[KVM_NR_IRQCHIPS][KVM_IOAPIC_NUM_PINS];
    struct kvm_kernel_irq_routing_entry *rt_entries;
    u32 nr_rt_entries;
    /*
     * Array indexed by gsi. Each entry contains list of irq chips
     * the gsi is connected to.
     */
    struct hlist_head map[0];
};

#else

struct kvm_irq_routing_table {};

#endif

#ifndef KVM_MEM_SLOTS_NUM
#define KVM_MEM_SLOTS_NUM (KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
#endif

/*
 * Note:
 * memslots are not sorted by id anymore, please use id_to_memslot()
 * to get the memslot by its id.
 */
struct kvm_memslots {
    u64 generation;
    struct kvm_memory_slot memslots[KVM_MEM_SLOTS_NUM];
    /* The mapping table from slot id to the index in memslots[]. */
    int id_to_index[KVM_MEM_SLOTS_NUM];
};

struct kvm {
    spinlock_t mmu_lock;
    struct mutex slots_lock;
    struct mm_struct *mm; /* userspace tied to this vm */
    struct kvm_memslots *memslots;
    struct srcu_struct srcu;
#ifdef CONFIG_KVM_APIC_ARCHITECTURE
    u32 bsp_vcpu_id;
#endif
    struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
    atomic_t online_vcpus;
    int last_boosted_vcpu;
    struct list_head vm_list;
    struct mutex lock;
    struct kvm_io_bus *buses[KVM_NR_BUSES];
#ifdef CONFIG_HAVE_KVM_EVENTFD
    struct {
        spinlock_t        lock;
        struct list_head  items;
        struct list_head  resampler_list;
        struct mutex      resampler_lock;
    } irqfds;
    struct list_head ioeventfds;
#endif
    struct kvm_vm_stat stat;
    struct kvm_arch arch;
    atomic_t users_count;
#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
    struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
    spinlock_t ring_lock;
    struct list_head coalesced_zones;
#endif

    struct mutex irq_lock;
#ifdef CONFIG_HAVE_KVM_IRQCHIP
    /*
     * Update side is protected by irq_lock and,
     * if configured, irqfds.lock.
     */
    struct kvm_irq_routing_table __rcu *irq_routing;
    struct hlist_head mask_notifier_list;
    struct hlist_head irq_ack_notifier_list;
#endif

#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
    struct mmu_notifier mmu_notifier;
    unsigned long mmu_notifier_seq;
    long mmu_notifier_count;
#endif
    long tlbs_dirty;
};

#define kvm_err(fmt, ...) \
    pr_err("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
#define kvm_info(fmt, ...) \
    pr_info("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
#define kvm_debug(fmt, ...) \
    pr_debug("kvm [%i]: " fmt, task_pid_nr(current), ## __VA_ARGS__)
#define kvm_pr_unimpl(fmt, ...) \
    pr_err_ratelimited("kvm [%i]: " fmt, \
               task_tgid_nr(current), ## __VA_ARGS__)

/* The guest did something we don't support. */
#define vcpu_unimpl(vcpu, fmt, ...)                 \
    kvm_pr_unimpl("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)

static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
{
    smp_rmb();
    return kvm->vcpus[i];
}

#define kvm_for_each_vcpu(idx, vcpup, kvm) \
    for (idx = 0; \
         idx < atomic_read(&kvm->online_vcpus) && \
         (vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
         idx++)

#define kvm_for_each_memslot(memslot, slots)    \
    for (memslot = &slots->memslots[0]; \
          memslot < slots->memslots + KVM_MEM_SLOTS_NUM && memslot->npages;\
        memslot++)

int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id);
void kvm_vcpu_uninit(struct kvm_vcpu *vcpu);

int __must_check vcpu_load(struct kvm_vcpu *vcpu);
void vcpu_put(struct kvm_vcpu *vcpu);

int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
          struct module *module);
void kvm_exit(void);

void kvm_get_kvm(struct kvm *kvm);
void kvm_put_kvm(struct kvm *kvm);
void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new);

static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
{
    return rcu_dereference_check(kvm->memslots,
            srcu_read_lock_held(&kvm->srcu)
            || lockdep_is_held(&kvm->slots_lock));
}

static inline struct kvm_memory_slot *
id_to_memslot(struct kvm_memslots *slots, int id)
{
    int index = slots->id_to_index[id];
    struct kvm_memory_slot *slot;

    slot = &slots->memslots[index];

    WARN_ON(slot->id != id);
    return slot;
}

int kvm_set_memory_region(struct kvm *kvm,
              struct kvm_userspace_memory_region *mem,
              int user_alloc);
int __kvm_set_memory_region(struct kvm *kvm,
                struct kvm_userspace_memory_region *mem,
                int user_alloc);
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
               struct kvm_memory_slot *dont);
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages);
int kvm_arch_prepare_memory_region(struct kvm *kvm,
                struct kvm_memory_slot *memslot,
                struct kvm_memory_slot old,
                struct kvm_userspace_memory_region *mem,
                int user_alloc);
void kvm_arch_commit_memory_region(struct kvm *kvm,
                struct kvm_userspace_memory_region *mem,
                struct kvm_memory_slot old,
                int user_alloc);
bool kvm_largepages_enabled(void);
void kvm_disable_largepages(void);
/* flush all memory translations */
void kvm_arch_flush_shadow_all(struct kvm *kvm);
/* flush memory translations pointing to 'slot' */
void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
                   struct kvm_memory_slot *slot);

int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
                int nr_pages);

struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
void kvm_release_page_clean(struct page *page);
void kvm_release_page_dirty(struct page *page);
void kvm_set_page_dirty(struct page *page);
void kvm_set_page_accessed(struct page *page);

pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn);
pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
               bool write_fault, bool *writable);
pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn);
pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
              bool *writable);
pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn);

void kvm_release_pfn_dirty(pfn_t pfn);
void kvm_release_pfn_clean(pfn_t pfn);
void kvm_set_pfn_dirty(pfn_t pfn);
void kvm_set_pfn_accessed(pfn_t pfn);
void kvm_get_pfn(pfn_t pfn);

int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
            int len);
int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
              unsigned long len);
int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len);
int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
               void *data, unsigned long len);
int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
             int offset, int len);
int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
            unsigned long len);
int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
               void *data, unsigned long len);
int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
                  gpa_t gpa);
int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len);
int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len);
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn);
int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn);
unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty(struct kvm *kvm, gfn_t gfn);
void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
                 gfn_t gfn);

void kvm_vcpu_block(struct kvm_vcpu *vcpu);
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
bool kvm_vcpu_yield_to(struct kvm_vcpu *target);
void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu);
void kvm_resched(struct kvm_vcpu *vcpu);
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu);
void kvm_put_guest_fpu(struct kvm_vcpu *vcpu);

void kvm_flush_remote_tlbs(struct kvm *kvm);
void kvm_reload_remote_mmus(struct kvm *kvm);

long kvm_arch_dev_ioctl(struct file *filp,
            unsigned int ioctl, unsigned long arg);
long kvm_arch_vcpu_ioctl(struct file *filp,
             unsigned int ioctl, unsigned long arg);
int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf);

int kvm_dev_ioctl_check_extension(long ext);

int kvm_get_dirty_log(struct kvm *kvm,
            struct kvm_dirty_log *log, int *is_dirty);
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
                struct kvm_dirty_log *log);

int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
                   struct
                   kvm_userspace_memory_region *mem,
                   int user_alloc);
int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level);
long kvm_arch_vm_ioctl(struct file *filp,
               unsigned int ioctl, unsigned long arg);

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);

int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
                    struct kvm_translation *tr);

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs);
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
                  struct kvm_sregs *sregs);
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
                  struct kvm_sregs *sregs);
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
                    struct kvm_mp_state *mp_state);
int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                    struct kvm_mp_state *mp_state);
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
                    struct kvm_guest_debug *dbg);
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);

int kvm_arch_init(void *opaque);
void kvm_arch_exit(void);

int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);

void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);

int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
int kvm_arch_hardware_enable(void *garbage);
void kvm_arch_hardware_disable(void *garbage);
int kvm_arch_hardware_setup(void);
void kvm_arch_hardware_unsetup(void);
void kvm_arch_check_processor_compat(void *rtn);
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu);
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu);

void kvm_free_physmem(struct kvm *kvm);

void *kvm_kvzalloc(unsigned long size);
void kvm_kvfree(const void *addr);

#ifndef __KVM_HAVE_ARCH_VM_ALLOC
static inline struct kvm *kvm_arch_alloc_vm(void)
{
    return kzalloc(sizeof(struct kvm), GFP_KERNEL);
}

static inline void kvm_arch_free_vm(struct kvm *kvm)
{
    kfree(kvm);
}
#endif

static inline wait_queue_head_t *kvm_arch_vcpu_wq(struct kvm_vcpu *vcpu)
{
#ifdef __KVM_HAVE_ARCH_WQP
    return vcpu->arch.wqp;
#else
    return &vcpu->wq;
#endif
}

int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
void kvm_arch_destroy_vm(struct kvm *kvm);
void kvm_free_all_assigned_devices(struct kvm *kvm);
void kvm_arch_sync_events(struct kvm *kvm);

int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu);
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);

bool kvm_is_mmio_pfn(pfn_t pfn);

struct kvm_irq_ack_notifier {
    struct hlist_node link;
    unsigned gsi;
    void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
};

struct kvm_assigned_dev_kernel {
    struct kvm_irq_ack_notifier ack_notifier;
    struct list_head list;
    int assigned_dev_id;
    int host_segnr;
    int host_busnr;
    int host_devfn;
    unsigned int entries_nr;
    int host_irq;
    bool host_irq_disabled;
    bool pci_2_3;
    struct msix_entry *host_msix_entries;
    int guest_irq;
    struct msix_entry *guest_msix_entries;
    unsigned long irq_requested_type;
    int irq_source_id;
    int flags;
    struct pci_dev *dev;
    struct kvm *kvm;
    spinlock_t intx_lock;
    spinlock_t intx_mask_lock;
    char irq_name[32];
    struct pci_saved_state *pci_saved_state;
};

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);

#ifdef __KVM_HAVE_IOAPIC
void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic,
                   union kvm_ioapic_redirect_entry *entry,
                   unsigned long *deliver_bitmask);
#endif
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level);
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
        int irq_source_id, int level);
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
void kvm_register_irq_ack_notifier(struct kvm *kvm,
                   struct kvm_irq_ack_notifier *kian);
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
                   struct kvm_irq_ack_notifier *kian);
int kvm_request_irq_source_id(struct kvm *kvm);
void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);

/* For vcpu->arch.iommu_flags */
#define KVM_IOMMU_CACHE_COHERENCY   0x1

#ifdef CONFIG_IOMMU_API
int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot);
int kvm_iommu_map_guest(struct kvm *kvm);
int kvm_iommu_unmap_guest(struct kvm *kvm);
int kvm_assign_device(struct kvm *kvm,
              struct kvm_assigned_dev_kernel *assigned_dev);
int kvm_deassign_device(struct kvm *kvm,
            struct kvm_assigned_dev_kernel *assigned_dev);
#else /* CONFIG_IOMMU_API */
static inline int kvm_iommu_map_pages(struct kvm *kvm,
                      struct kvm_memory_slot *slot)
{
    return 0;
}

static inline void kvm_iommu_unmap_pages(struct kvm *kvm,
                     struct kvm_memory_slot *slot)
{
}

static inline int kvm_iommu_map_guest(struct kvm *kvm)
{
    return -ENODEV;
}

static inline int kvm_iommu_unmap_guest(struct kvm *kvm)
{
    return 0;
}

static inline int kvm_assign_device(struct kvm *kvm,
        struct kvm_assigned_dev_kernel *assigned_dev)
{
    return 0;
}

static inline int kvm_deassign_device(struct kvm *kvm,
        struct kvm_assigned_dev_kernel *assigned_dev)
{
    return 0;
}
#endif /* CONFIG_IOMMU_API */

static inline void kvm_guest_enter(void)
{
    BUG_ON(preemptible());
    vtime_account(current);
    current->flags |= PF_VCPU;
    /* KVM does not hold any references to rcu protected data when it
     * switches CPU into a guest mode. In fact switching to a guest mode
     * is very similar to exiting to userspase from rcu point of view. In
     * addition CPU may stay in a guest mode for quite a long time (up to
     * one time slice). Lets treat guest mode as quiescent state, just like
     * we do with user-mode execution.
     */
    rcu_virt_note_context_switch(smp_processor_id());
}

static inline void kvm_guest_exit(void)
{
    vtime_account(current);
    current->flags &= ~PF_VCPU;
}

/*
 * search_memslots() and __gfn_to_memslot() are here because they are
 * used in non-modular code in arch/powerpc/kvm/book3s_hv_rm_mmu.c.
 * gfn_to_memslot() itself isn't here as an inline because that would
 * bloat other code too much.
 */
static inline struct kvm_memory_slot *
search_memslots(struct kvm_memslots *slots, gfn_t gfn)
{
    struct kvm_memory_slot *memslot;

    kvm_for_each_memslot(memslot, slots)
        if (gfn >= memslot->base_gfn &&
              gfn < memslot->base_gfn + memslot->npages)
            return memslot;

    return NULL;
}

static inline struct kvm_memory_slot *
__gfn_to_memslot(struct kvm_memslots *slots, gfn_t gfn)
{
    return search_memslots(slots, gfn);
}

static inline unsigned long
__gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
{
    return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
}

static inline int memslot_id(struct kvm *kvm, gfn_t gfn)
{
    return gfn_to_memslot(kvm, gfn)->id;
}

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));
}

static inline gfn_t
hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot)
{
    gfn_t gfn_offset = (hva - slot->userspace_addr) >> PAGE_SHIFT;

    return slot->base_gfn + gfn_offset;
}

static inline gpa_t gfn_to_gpa(gfn_t gfn)
{
    return (gpa_t)gfn << PAGE_SHIFT;
}

static inline gfn_t gpa_to_gfn(gpa_t gpa)
{
    return (gfn_t)(gpa >> PAGE_SHIFT);
}

static inline hpa_t pfn_to_hpa(pfn_t pfn)
{
    return (hpa_t)pfn << PAGE_SHIFT;
}

static inline void kvm_migrate_timers(struct kvm_vcpu *vcpu)
{
    set_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests);
}

enum kvm_stat_kind {
    KVM_STAT_VM,
    KVM_STAT_VCPU,
};

struct kvm_stats_debugfs_item {
    const char *name;
    int offset;
    enum kvm_stat_kind kind;
    struct dentry *dentry;
};
extern struct kvm_stats_debugfs_item debugfs_entries[];
extern struct dentry *kvm_debugfs_dir;

#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_seq)
{
    if (unlikely(vcpu->kvm->mmu_notifier_count))
        return 1;
    /*
     * Ensure the read of mmu_notifier_count happens before the read
     * of mmu_notifier_seq.  This interacts with the smp_wmb() in
     * mmu_notifier_invalidate_range_end to make sure that the caller
     * either sees the old (non-zero) value of mmu_notifier_count or
     * the new (incremented) value of mmu_notifier_seq.
     * PowerPC Book3s HV KVM calls this under a per-page lock
     * rather than under kvm->mmu_lock, for scalability, so
     * can't rely on kvm->mmu_lock to keep things ordered.
     */
    smp_rmb();
    if (vcpu->kvm->mmu_notifier_seq != mmu_seq)
        return 1;
    return 0;
}
#endif

#ifdef KVM_CAP_IRQ_ROUTING

#define KVM_MAX_IRQ_ROUTES 1024

int kvm_setup_default_irq_routing(struct kvm *kvm);
int kvm_set_irq_routing(struct kvm *kvm,
            const struct kvm_irq_routing_entry *entries,
            unsigned nr,
            unsigned flags);
void kvm_free_irq_routing(struct kvm *kvm);

int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi);

#else

static inline void kvm_free_irq_routing(struct kvm *kvm) {}

#endif

#ifdef CONFIG_HAVE_KVM_EVENTFD

void kvm_eventfd_init(struct kvm *kvm);
int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
void kvm_irqfd_release(struct kvm *kvm);
void kvm_irq_routing_update(struct kvm *, struct kvm_irq_routing_table *);
int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);

#else

static inline void kvm_eventfd_init(struct kvm *kvm) {}

static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
{
    return -EINVAL;
}

static inline void kvm_irqfd_release(struct kvm *kvm) {}

#ifdef CONFIG_HAVE_KVM_IRQCHIP
static inline void kvm_irq_routing_update(struct kvm *kvm,
                      struct kvm_irq_routing_table *irq_rt)
{
    rcu_assign_pointer(kvm->irq_routing, irq_rt);
}
#endif

static inline int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args)
{
    return -ENOSYS;
}

#endif /* CONFIG_HAVE_KVM_EVENTFD */

#ifdef CONFIG_KVM_APIC_ARCHITECTURE
static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
{
    return vcpu->kvm->bsp_vcpu_id == vcpu->vcpu_id;
}

bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);

#else

static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }

#endif

#ifdef __KVM_HAVE_DEVICE_ASSIGNMENT

long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
                  unsigned long arg);

#else

static inline long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
                        unsigned long arg)
{
    return -ENOTTY;
}

#endif

static inline void kvm_make_request(int req, struct kvm_vcpu *vcpu)
{
    set_bit(req, &vcpu->requests);
}

static inline bool kvm_check_request(int req, struct kvm_vcpu *vcpu)
{
    if (test_bit(req, &vcpu->requests)) {
        clear_bit(req, &vcpu->requests);
        return true;
    } else {
        return false;
    }
}

#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT

static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
{
    vcpu->spin_loop.in_spin_loop = val;
}
static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
{
    vcpu->spin_loop.dy_eligible = val;
}

#else /* !CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */

static inline void kvm_vcpu_set_in_spin_loop(struct kvm_vcpu *vcpu, bool val)
{
}

static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
{
}

static inline bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
{
    return true;
}

#endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */
#endif