#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 <linux/irqflags.h>
#include <linux/context_tracking.h>
#include <linux/irqbypass.h>
#include <asm/signal.h>

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

#include <linux/kvm_types.h>

#include <asm/kvm_host.h>

/*
 * 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)
#define KVM_MEMSLOT_INCOHERENT  (1UL << 17)

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

#ifndef KVM_ADDRESS_SPACE_NUM
#define KVM_ADDRESS_SPACE_NUM   1
#endif

/*
 * For the normal pfn, the highest 12 bits should be zero,
 * so we can mask bit 62 ~ bit 52  to indicate the error pfn,
 * mask bit 63 to indicate the noslot pfn.
 */
#define KVM_PFN_ERR_MASK        (0x7ffULL << 52)
#define KVM_PFN_ERR_NOSLOT_MASK (0xfffULL << 52)
#define KVM_PFN_NOSLOT          (0x1ULL << 63)

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

/*
 * error pfns indicate that the gfn is in slot but faild to
 * translate it to pfn on host.
 */
static inline bool is_error_pfn(kvm_pfn_t pfn)
{
        return !!(pfn & KVM_PFN_ERR_MASK);
}

/*
 * error_noslot pfns indicate that the gfn can not be
 * translated to pfn - it is not in slot or failed to
 * translate it to pfn.
 */
static inline bool is_error_noslot_pfn(kvm_pfn_t pfn)
{
        return !!(pfn & KVM_PFN_ERR_NOSLOT_MASK);
}

/* noslot pfn indicates that the gfn is not in slot. */
static inline bool is_noslot_pfn(kvm_pfn_t pfn)
{
        return pfn == KVM_PFN_NOSLOT;
}

/*
 * architectures with KVM_HVA_ERR_BAD other than PAGE_OFFSET (e.g. s390)
 * provide own defines and kvm_is_error_hva
 */
#ifndef KVM_HVA_ERR_BAD

#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;
}

#endif

#define KVM_ERR_PTR_BAD_PAGE    (ERR_PTR(-ENOENT))

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

/*
 * Architecture-independent vcpu->requests bit members
 * Bits 4-7 are reserved for more arch-independent bits.
 */
#define KVM_REQ_TLB_FLUSH          0
#define KVM_REQ_MMU_RELOAD         1
#define KVM_REQ_PENDING_TIMER      2
#define KVM_REQ_UNHALT             3

#define KVM_USERSPACE_IRQ_SOURCE_ID             0
#define KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID        1

extern struct kmem_cache *kvm_vcpu_cache;

extern spinlock_t kvm_lock;
extern struct list_head vm_list;

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;
        int ioeventfd_count;
        struct kvm_io_range range[];
};

enum kvm_bus {
        KVM_MMIO_BUS,
        KVM_PIO_BUS,
        KVM_VIRTIO_CCW_NOTIFY_BUS,
        KVM_FAST_MMIO_BUS,
        KVM_NR_BUSES
};

int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
                     int len, const void *val);
int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
                            gpa_t addr, int len, const void *val, long cookie);
int kvm_io_bus_read(struct kvm_vcpu *vcpu, 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;
        bool   wakeup_all;
};

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, unsigned long hva,
                       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;

        int pre_pcpu;
        struct list_head blocked_vcpu_list;

        struct mutex mutex;
        struct kvm_run *run;

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

#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
        bool preempted;
        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 *dirty_bitmap;
        struct kvm_arch_memory_slot arch;
        unsigned long userspace_addr;
        u32 flags;
        short id;
};

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

struct kvm_s390_adapter_int {
        u64 ind_addr;
        u64 summary_addr;
        u64 ind_offset;
        u32 summary_offset;
        u32 adapter_id;
};

struct kvm_hv_sint {
        u32 vcpu;
        u32 sint;
};

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,
                   bool line_status);
        union {
                struct {
                        unsigned irqchip;
                        unsigned pin;
                } irqchip;
                struct msi_msg msi;
                struct kvm_s390_adapter_int adapter;
                struct kvm_hv_sint hv_sint;
        };
        struct hlist_node link;
};

#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
struct kvm_irq_routing_table {
        int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
        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];
};
#endif

#ifndef KVM_PRIVATE_MEM_SLOTS
#define KVM_PRIVATE_MEM_SLOTS 0
#endif

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

#ifndef __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
static inline int kvm_arch_vcpu_memslots_id(struct kvm_vcpu *vcpu)
{
        return 0;
}
#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[]. */
        short id_to_index[KVM_MEM_SLOTS_NUM];
        atomic_t lru_slot;
        int used_slots;
};

struct kvm {
        spinlock_t mmu_lock;
        struct mutex slots_lock;
        struct mm_struct *mm; /* userspace tied to this vm */
        struct kvm_memslots *memslots[KVM_ADDRESS_SPACE_NUM];
        struct srcu_struct srcu;
        struct srcu_struct irq_srcu;
        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.
         */
        struct kvm_irq_routing_table __rcu *irq_routing;
#endif
#ifdef CONFIG_HAVE_KVM_IRQFD
        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;
        struct list_head devices;
};

#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, guest rIP: 0x%lx " fmt,                  \
                        (vcpu)->vcpu_id, kvm_rip_read(vcpu), ## __VA_ARGS__)

#define vcpu_debug(vcpu, fmt, ...)                                      \
        kvm_debug("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)
#define vcpu_err(vcpu, fmt, ...)                                        \
        kvm_err("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__)

static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i)
{
        /* Pairs with smp_wmb() in kvm_vm_ioctl_create_vcpu, in case
         * the caller has read kvm->online_vcpus before (as is the case
         * for kvm_for_each_vcpu, for example).
         */
        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++)

static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id)
{
        struct kvm_vcpu *vcpu;
        int i;

        if (id < 0 || id >= KVM_MAX_VCPUS)
                return NULL;
        vcpu = kvm_get_vcpu(kvm, id);
        if (vcpu && vcpu->vcpu_id == id)
                return vcpu;
        kvm_for_each_vcpu(i, vcpu, kvm)
                if (vcpu->vcpu_id == id)
                        return vcpu;
        return NULL;
}

#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);

#ifdef __KVM_HAVE_IOAPIC
void kvm_vcpu_request_scan_ioapic(struct kvm *kvm);
void kvm_arch_post_irq_routing_update(struct kvm *kvm);
#else
static inline void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
{
}
static inline void kvm_arch_post_irq_routing_update(struct kvm *kvm)
{
}
#endif

#ifdef CONFIG_HAVE_KVM_IRQFD
int kvm_irqfd_init(void);
void kvm_irqfd_exit(void);
#else
static inline int kvm_irqfd_init(void)
{
        return 0;
}

static inline void kvm_irqfd_exit(void)
{
}
#endif
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);

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

static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)
{
        return __kvm_memslots(kvm, 0);
}

static inline struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu)
{
        int as_id = kvm_arch_vcpu_memslots_id(vcpu);

        return __kvm_memslots(vcpu->kvm, as_id);
}

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;
}

/*
 * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations:
 * - create a new memory slot
 * - delete an existing memory slot
 * - modify an existing memory slot
 *   -- move it in the guest physical memory space
 *   -- just change its flags
 *
 * Since flags can be changed by some of these operations, the following
 * differentiation is the best we can do for __kvm_set_memory_region():
 */
enum kvm_mr_change {
        KVM_MR_CREATE,
        KVM_MR_DELETE,
        KVM_MR_MOVE,
        KVM_MR_FLAGS_ONLY,
};

int kvm_set_memory_region(struct kvm *kvm,
                          const struct kvm_userspace_memory_region *mem);
int __kvm_set_memory_region(struct kvm *kvm,
                            const struct kvm_userspace_memory_region *mem);
void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
                           struct kvm_memory_slot *dont);
int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
                            unsigned long npages);
void kvm_arch_memslots_updated(struct kvm *kvm, struct kvm_memslots *slots);
int kvm_arch_prepare_memory_region(struct kvm *kvm,
                                struct kvm_memory_slot *memslot,
                                const struct kvm_userspace_memory_region *mem,
                                enum kvm_mr_change change);
void kvm_arch_commit_memory_region(struct kvm *kvm,
                                const struct kvm_userspace_memory_region *mem,
                                const struct kvm_memory_slot *old,
                                const struct kvm_memory_slot *new,
                                enum kvm_mr_change change);
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_memory_slot *slot, 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_prot(struct kvm *kvm, gfn_t gfn, bool *writable);
unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn);
unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, gfn_t gfn,
                                      bool *writable);
void kvm_release_page_clean(struct page *page);
void kvm_release_page_dirty(struct page *page);
void kvm_set_page_accessed(struct page *page);

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

void kvm_release_pfn_clean(kvm_pfn_t pfn);
void kvm_set_pfn_dirty(kvm_pfn_t pfn);
void kvm_set_pfn_accessed(kvm_pfn_t pfn);
void kvm_get_pfn(kvm_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, unsigned long len);
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);
bool 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);

struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);
struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn);
kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn);
unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);
unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable);
int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset,
                             int len);
int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
                               unsigned long len);
int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data,
                        unsigned long len);
int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, const void *data,
                              int offset, int len);
int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
                         unsigned long len);
void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn);

void kvm_vcpu_block(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu);
void kvm_vcpu_kick(struct kvm_vcpu *vcpu);
int kvm_vcpu_yield_to(struct kvm_vcpu *target);
void kvm_vcpu_on_spin(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);
bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req);

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_vm_ioctl_check_extension(struct kvm *kvm, long ext);

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

int kvm_get_dirty_log_protect(struct kvm *kvm,
                        struct kvm_dirty_log *log, bool *is_dirty);

void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm,
                                        struct kvm_memory_slot *slot,
                                        gfn_t gfn_offset,
                                        unsigned long mask);

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

int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
                        bool line_status);
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_sched_in(struct kvm_vcpu *vcpu, int cpu);

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_postcreate(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu);

int kvm_arch_hardware_enable(void);
void kvm_arch_hardware_disable(void);
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_kvzalloc(unsigned long size);

#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

#ifdef __KVM_HAVE_ARCH_NONCOHERENT_DMA
void kvm_arch_register_noncoherent_dma(struct kvm *kvm);
void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm);
bool kvm_arch_has_noncoherent_dma(struct kvm *kvm);
#else
static inline void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
{
}

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

static inline bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
{
        return false;
}
#endif
#ifdef __KVM_HAVE_ARCH_ASSIGNED_DEVICE
void kvm_arch_start_assignment(struct kvm *kvm);
void kvm_arch_end_assignment(struct kvm *kvm);
bool kvm_arch_has_assigned_device(struct kvm *kvm);
#else
static inline void kvm_arch_start_assignment(struct kvm *kvm)
{
}

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

static inline bool kvm_arch_has_assigned_device(struct kvm *kvm)
{
        return false;
}
#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
}

#ifdef __KVM_HAVE_ARCH_INTC_INITIALIZED
/*
 * returns true if the virtual interrupt controller is initialized and
 * ready to accept virtual IRQ. On some architectures the virtual interrupt
 * controller is dynamically instantiated and this is not always true.
 */
bool kvm_arch_intc_initialized(struct kvm *kvm);
#else
static inline bool kvm_arch_intc_initialized(struct kvm *kvm)
{
        return true;
}
#endif

int kvm_arch_init_vm(struct kvm *kvm, unsigned long type);
void kvm_arch_destroy_vm(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_reserved_pfn(kvm_pfn_t pfn);

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

int kvm_irq_map_gsi(struct kvm *kvm,
                    struct kvm_kernel_irq_routing_entry *entries, int gsi);
int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin);

int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
                bool line_status);
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
                int irq_source_id, int level, bool line_status);
int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
                               struct kvm *kvm, int irq_source_id,
                               int level, bool line_status);
bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
void kvm_notify_acked_gsi(struct kvm *kvm, int gsi);
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);

#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
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);
#else
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)
{
}
#endif

/* must be called with irqs disabled */
static inline void __kvm_guest_enter(void)
{
        guest_enter();
        /* 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 userspace 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.
         */
        if (!context_tracking_cpu_is_enabled())
                rcu_virt_note_context_switch(smp_processor_id());
}

/* must be called with irqs disabled */
static inline void __kvm_guest_exit(void)
{
        guest_exit();
}

static inline void kvm_guest_enter(void)
{
        unsigned long flags;

        local_irq_save(flags);
        __kvm_guest_enter();
        local_irq_restore(flags);
}

static inline void kvm_guest_exit(void)
{
        unsigned long flags;

        local_irq_save(flags);
        __kvm_guest_exit();
        local_irq_restore(flags);
}

/*
 * 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)
{
        int start = 0, end = slots->used_slots;
        int slot = atomic_read(&slots->lru_slot);
        struct kvm_memory_slot *memslots = slots->memslots;

        if (gfn >= memslots[slot].base_gfn &&
            gfn < memslots[slot].base_gfn + memslots[slot].npages)
                return &memslots[slot];

        while (start < end) {
                slot = start + (end - start) / 2;

                if (gfn >= memslots[slot].base_gfn)
                        end = slot;
                else
                        start = slot + 1;
        }

        if (gfn >= memslots[start].base_gfn &&
            gfn < memslots[start].base_gfn + memslots[start].npages) {
                atomic_set(&slots->lru_slot, start);
                return &memslots[start];
        }

        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
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(kvm_pfn_t pfn)
{
        return (hpa_t)pfn << PAGE_SHIFT;
}

static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
{
        unsigned long hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));

        return kvm_is_error_hva(hva);
}

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;
};
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 *kvm, unsigned long mmu_seq)
{
        if (unlikely(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 (kvm->mmu_notifier_seq != mmu_seq)
                return 1;
        return 0;
}
#endif

#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING

#ifdef CONFIG_S390
#define KVM_MAX_IRQ_ROUTES 4096 //FIXME: we can have more than that...
#else
#define KVM_MAX_IRQ_ROUTES 1024
#endif

int kvm_setup_default_irq_routing(struct kvm *kvm);
int kvm_setup_empty_irq_routing(struct kvm *kvm);
int kvm_set_irq_routing(struct kvm *kvm,
                        const struct kvm_irq_routing_entry *entries,
                        unsigned nr,
                        unsigned flags);
int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
                          const struct kvm_irq_routing_entry *ue);
void kvm_free_irq_routing(struct kvm *kvm);

#else

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

#endif

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

#ifdef CONFIG_HAVE_KVM_EVENTFD

void kvm_eventfd_init(struct kvm *kvm);
int kvm_ioeventfd(struct kvm *kvm, struct kvm_ioeventfd *args);

#ifdef CONFIG_HAVE_KVM_IRQFD
int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args);
void kvm_irqfd_release(struct kvm *kvm);
void kvm_irq_routing_update(struct kvm *);
#else
static inline int kvm_irqfd(struct kvm *kvm, struct kvm_irqfd *args)
{
        return -EINVAL;
}

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

#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)
{
}
#endif
void kvm_arch_irq_routing_update(struct kvm *kvm);

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

#endif /* CONFIG_HAVE_KVM_EVENTFD */

#ifdef CONFIG_KVM_APIC_ARCHITECTURE
bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu);
#else
static inline bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) { return true; }
#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;
        }
}

extern bool kvm_rebooting;

struct kvm_device {
        struct kvm_device_ops *ops;
        struct kvm *kvm;
        void *private;
        struct list_head vm_node;
};

/* create, destroy, and name are mandatory */
struct kvm_device_ops {
        const char *name;
        int (*create)(struct kvm_device *dev, u32 type);

        /*
         * Destroy is responsible for freeing dev.
         *
         * Destroy may be called before or after destructors are called
         * on emulated I/O regions, depending on whether a reference is
         * held by a vcpu or other kvm component that gets destroyed
         * after the emulated I/O.
         */
        void (*destroy)(struct kvm_device *dev);

        int (*set_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
        int (*get_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
        int (*has_attr)(struct kvm_device *dev, struct kvm_device_attr *attr);
        long (*ioctl)(struct kvm_device *dev, unsigned int ioctl,
                      unsigned long arg);
};

void kvm_device_get(struct kvm_device *dev);
void kvm_device_put(struct kvm_device *dev);
struct kvm_device *kvm_device_from_filp(struct file *filp);
int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type);
void kvm_unregister_device_ops(u32 type);

extern struct kvm_device_ops kvm_mpic_ops;
extern struct kvm_device_ops kvm_xics_ops;
extern struct kvm_device_ops kvm_arm_vgic_v2_ops;
extern struct kvm_device_ops kvm_arm_vgic_v3_ops;

#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)
{
}
#endif /* CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT */

#ifdef CONFIG_HAVE_KVM_IRQ_BYPASS
int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *,
                           struct irq_bypass_producer *);
void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *,
                           struct irq_bypass_producer *);
void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *);
void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *);
int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
                                  uint32_t guest_irq, bool set);
#endif /* CONFIG_HAVE_KVM_IRQ_BYPASS */

#endif