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/*

 * QEMU KVM support

 *

 * Copyright IBM, Corp. 2008

 *           Red Hat, Inc. 2008

 *

 * Authors:

 *  Anthony Liguori   <aliguori@us.ibm.com>

 *  Glauber Costa     <gcosta@redhat.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 *

 */

#include <sys/types.h>

#include <sys/ioctl.h>

#include <sys/mman.h>

#include <stdarg.h>

#include <linux/kvm.h>

#include "qemu-common.h"

#include "qemu-barrier.h"

#include "sysemu.h"

#include "hw/hw.h"

#include "gdbstub.h"

#include "kvm.h"

#include "bswap.h"

/* KVM uses PAGE_SIZE in it's definition of COALESCED_MMIO_MAX */

#define PAGE_SIZE TARGET_PAGE_SIZE

//#define DEBUG_KVM

#ifdef DEBUG_KVM

#define DPRINTF(fmt, ...) \

    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)

#else

#define DPRINTF(fmt, ...) \

    do { } while (0)

#endif

typedef struct KVMSlot

{

    target_phys_addr_t start_addr;

    ram_addr_t memory_size;

    ram_addr_t phys_offset;

    int slot;

    int flags;

} KVMSlot;

typedef struct kvm_dirty_log KVMDirtyLog;

struct KVMState

{

    KVMSlot slots[32];

    int fd;

    int vmfd;

    int coalesced_mmio;

#ifdef KVM_CAP_COALESCED_MMIO

    struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;

#endif

    int broken_set_mem_region;

    int migration_log;

    int vcpu_events;

    int robust_singlestep;

    int debugregs;

#ifdef KVM_CAP_SET_GUEST_DEBUG

    struct kvm_sw_breakpoint_head kvm_sw_breakpoints;

#endif

    int irqchip_in_kernel;

    int pit_in_kernel;

    int xsave, xcrs;

};

static KVMState *kvm_state;

static KVMSlot *kvm_alloc_slot(KVMState *s)

{

    int i;

    for (i = 0; i < ARRAY_SIZE(s->slots); i++) {

        /* KVM private memory slots */

        if (i >= 8 && i < 12)

            continue;

        if (s->slots[i].memory_size == 0)

            return &s->slots[i];

    }

    fprintf(stderr, "%s: no free slot available\n", __func__);

    abort();

}

static KVMSlot *kvm_lookup_matching_slot(KVMState *s,

                                         target_phys_addr_t start_addr,

                                         target_phys_addr_t end_addr)

{

    int i;

    for (i = 0; i < ARRAY_SIZE(s->slots); i++) {

        KVMSlot *mem = &s->slots[i];

        if (start_addr == mem->start_addr &&

            end_addr == mem->start_addr + mem->memory_size) {

            return mem;

        }

    }

    return NULL;

}

/*

 * Find overlapping slot with lowest start address

 */

static KVMSlot *kvm_lookup_overlapping_slot(KVMState *s,

                                            target_phys_addr_t start_addr,

                                            target_phys_addr_t end_addr)

{

    KVMSlot *found = NULL;

    int i;

    for (i = 0; i < ARRAY_SIZE(s->slots); i++) {

        KVMSlot *mem = &s->slots[i];

        if (mem->memory_size == 0 ||

            (found && found->start_addr < mem->start_addr)) {

            continue;

        }

        if (end_addr > mem->start_addr &&

            start_addr < mem->start_addr + mem->memory_size) {

            found = mem;

        }

    }

    return found;

}

int kvm_physical_memory_addr_from_ram(KVMState *s, ram_addr_t ram_addr,

                                      target_phys_addr_t *phys_addr)

{

    int i;

    for (i = 0; i < ARRAY_SIZE(s->slots); i++) {

        KVMSlot *mem = &s->slots[i];

        if (ram_addr >= mem->phys_offset &&

            ram_addr < mem->phys_offset + mem->memory_size) {

            *phys_addr = mem->start_addr + (ram_addr - mem->phys_offset);

            return 1;

        }

    }

    return 0;

}

static int kvm_set_user_memory_region(KVMState *s, KVMSlot *slot)

{

    struct kvm_userspace_memory_region mem;

    mem.slot = slot->slot;

    mem.guest_phys_addr = slot->start_addr;

    mem.memory_size = slot->memory_size;

    mem.userspace_addr = (unsigned long)qemu_get_ram_ptr(slot->phys_offset);

    mem.flags = slot->flags;

    if (s->migration_log) {

        mem.flags |= KVM_MEM_LOG_DIRTY_PAGES;

    }

    return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);

}

static void kvm_reset_vcpu(void *opaque)

{

    CPUState *env = opaque;

    kvm_arch_reset_vcpu(env);

}

int kvm_irqchip_in_kernel(void)

{

    return kvm_state->irqchip_in_kernel;

}

int kvm_pit_in_kernel(void)

{

    return kvm_state->pit_in_kernel;

}

int kvm_init_vcpu(CPUState *env)

{

    KVMState *s = kvm_state;

    long mmap_size;

    int ret;

    DPRINTF("kvm_init_vcpu\n");

    ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);

    if (ret < 0) {

        DPRINTF("kvm_create_vcpu failed\n");

        goto err;

    }

    env->kvm_fd = ret;

    env->kvm_state = s;

    mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);

    if (mmap_size < 0) {

        DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");

        goto err;

    }

    env->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,

                        env->kvm_fd, 0);

    if (env->kvm_run == MAP_FAILED) {

        ret = -errno;

        DPRINTF("mmap'ing vcpu state failed\n");

        goto err;

    }

#ifdef KVM_CAP_COALESCED_MMIO

    if (s->coalesced_mmio && !s->coalesced_mmio_ring)

        s->coalesced_mmio_ring = (void *) env->kvm_run +

                s->coalesced_mmio * PAGE_SIZE;

#endif

    ret = kvm_arch_init_vcpu(env);

    if (ret == 0) {

        qemu_register_reset(kvm_reset_vcpu, env);

        kvm_arch_reset_vcpu(env);

    }

err:

    return ret;

}

/*

 * dirty pages logging control

 */

static int kvm_dirty_pages_log_change(target_phys_addr_t phys_addr,

                                      ram_addr_t size, int flags, int mask)

{

    KVMState *s = kvm_state;

    KVMSlot *mem = kvm_lookup_matching_slot(s, phys_addr, phys_addr + size);

    int old_flags;

    if (mem == NULL)  {

            fprintf(stderr, "BUG: %s: invalid parameters " TARGET_FMT_plx "-"

                    TARGET_FMT_plx "\n", __func__, phys_addr,

                    (target_phys_addr_t)(phys_addr + size - 1));

            return -EINVAL;

    }

    old_flags = mem->flags;

    flags = (mem->flags & ~mask) | flags;

    mem->flags = flags;

    /* If nothing changed effectively, no need to issue ioctl */

    if (s->migration_log) {

        flags |= KVM_MEM_LOG_DIRTY_PAGES;

    }

    if (flags == old_flags) {

            return 0;

    }

    return kvm_set_user_memory_region(s, mem);

}

int kvm_log_start(target_phys_addr_t phys_addr, ram_addr_t size)

{

        return kvm_dirty_pages_log_change(phys_addr, size,

                                          KVM_MEM_LOG_DIRTY_PAGES,

                                          KVM_MEM_LOG_DIRTY_PAGES);

}

int kvm_log_stop(target_phys_addr_t phys_addr, ram_addr_t size)

{

        return kvm_dirty_pages_log_change(phys_addr, size,

                                          0,

                                          KVM_MEM_LOG_DIRTY_PAGES);

}

static int kvm_set_migration_log(int enable)

{

    KVMState *s = kvm_state;

    KVMSlot *mem;

    int i, err;

    s->migration_log = enable;

    for (i = 0; i < ARRAY_SIZE(s->slots); i++) {

        mem = &s->slots[i];

        if (!mem->memory_size) {

            continue;

        }

        if (!!(mem->flags & KVM_MEM_LOG_DIRTY_PAGES) == enable) {

            continue;

        }

        err = kvm_set_user_memory_region(s, mem);

        if (err) {

            return err;

        }

    }

    return 0;

}

/* get kvm's dirty pages bitmap and update qemu's */

static int kvm_get_dirty_pages_log_range(unsigned long start_addr,

                                         unsigned long *bitmap,

                                         unsigned long offset,

                                         unsigned long mem_size)

{

    unsigned int i, j;

    unsigned long page_number, addr, addr1, c;

    ram_addr_t ram_addr;

    unsigned int len = ((mem_size / TARGET_PAGE_SIZE) + HOST_LONG_BITS - 1) /

        HOST_LONG_BITS;

    /*

     * bitmap-traveling is faster than memory-traveling (for addr...)

     * especially when most of the memory is not dirty.

     */

    for (i = 0; i < len; i++) {

        if (bitmap[i] != 0) {

            c = leul_to_cpu(bitmap[i]);

            do {

                j = ffsl(c) - 1;

                c &= ~(1ul << j);

                page_number = i * HOST_LONG_BITS + j;

                addr1 = page_number * TARGET_PAGE_SIZE;

                addr = offset + addr1;

                ram_addr = cpu_get_physical_page_desc(addr);

                cpu_physical_memory_set_dirty(ram_addr);

            } while (c != 0);

        }

    }

    return 0;

}

#define ALIGN(x, y)  (((x)+(y)-1) & ~((y)-1))

/**

 * kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space

 * This function updates qemu's dirty bitmap using cpu_physical_memory_set_dirty().

 * This means all bits are set to dirty.

 *

 * @start_add: start of logged region.

 * @end_addr: end of logged region.

 */

static int kvm_physical_sync_dirty_bitmap(target_phys_addr_t start_addr,

                                          target_phys_addr_t end_addr)

{

    KVMState *s = kvm_state;

    unsigned long size, allocated_size = 0;

    KVMDirtyLog d;

    KVMSlot *mem;

    int ret = 0;

    d.dirty_bitmap = NULL;

    while (start_addr < end_addr) {

        mem = kvm_lookup_overlapping_slot(s, start_addr, end_addr);

        if (mem == NULL) {

            break;

        }

        size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS), HOST_LONG_BITS) / 8;

        if (!d.dirty_bitmap) {

            d.dirty_bitmap = qemu_malloc(size);

        } else if (size > allocated_size) {

            d.dirty_bitmap = qemu_realloc(d.dirty_bitmap, size);

        }

        allocated_size = size;

        memset(d.dirty_bitmap, 0, allocated_size);

        d.slot = mem->slot;

        if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {

            DPRINTF("ioctl failed %d\n", errno);

            ret = -1;

            break;

        }

        kvm_get_dirty_pages_log_range(mem->start_addr, d.dirty_bitmap,

                                      mem->start_addr, mem->memory_size);

        start_addr = mem->start_addr + mem->memory_size;

    }

    qemu_free(d.dirty_bitmap);

    return ret;

}

int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)

{

    int ret = -ENOSYS;

#ifdef KVM_CAP_COALESCED_MMIO

    KVMState *s = kvm_state;

    if (s->coalesced_mmio) {

        struct kvm_coalesced_mmio_zone zone;

        zone.addr = start;

        zone.size = size;

        ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);

    }

#endif

    return ret;

}

int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)

{

    int ret = -ENOSYS;

#ifdef KVM_CAP_COALESCED_MMIO

    KVMState *s = kvm_state;

    if (s->coalesced_mmio) {

        struct kvm_coalesced_mmio_zone zone;

        zone.addr = start;

        zone.size = size;

        ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);

    }

#endif

    return ret;

}

int kvm_check_extension(KVMState *s, unsigned int extension)

{

    int ret;

    ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);

    if (ret < 0) {

        ret = 0;

    }

    return ret;

}

static void kvm_set_phys_mem(target_phys_addr_t start_addr,

                             ram_addr_t size,

                             ram_addr_t phys_offset)

{

    KVMState *s = kvm_state;

    ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;

    KVMSlot *mem, old;

    int err;

    /* kvm works in page size chunks, but the function may be called

       with sub-page size and unaligned start address. */

    size = TARGET_PAGE_ALIGN(size);

    start_addr = TARGET_PAGE_ALIGN(start_addr);

    /* KVM does not support read-only slots */

    phys_offset &= ~IO_MEM_ROM;

    while (1) {

        mem = kvm_lookup_overlapping_slot(s, start_addr, start_addr + size);

        if (!mem) {

            break;

        }

        if (flags < IO_MEM_UNASSIGNED && start_addr >= mem->start_addr &&

            (start_addr + size <= mem->start_addr + mem->memory_size) &&

            (phys_offset - start_addr == mem->phys_offset - mem->start_addr)) {

            /* The new slot fits into the existing one and comes with

             * identical parameters - nothing to be done. */

            return;

        }

        old = *mem;

        /* unregister the overlapping slot */

        mem->memory_size = 0;

        err = kvm_set_user_memory_region(s, mem);

        if (err) {

            fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",

                    __func__, strerror(-err));

            abort();

        }

        /* Workaround for older KVM versions: we can't join slots, even not by

         * unregistering the previous ones and then registering the larger

         * slot. We have to maintain the existing fragmentation. Sigh.

         *

         * This workaround assumes that the new slot starts at the same

         * address as the first existing one. If not or if some overlapping

         * slot comes around later, we will fail (not seen in practice so far)

         * - and actually require a recent KVM version. */

        if (s->broken_set_mem_region &&

            old.start_addr == start_addr && old.memory_size < size &&

            flags < IO_MEM_UNASSIGNED) {

            mem = kvm_alloc_slot(s);

            mem->memory_size = old.memory_size;

            mem->start_addr = old.start_addr;

            mem->phys_offset = old.phys_offset;

            mem->flags = 0;

            err = kvm_set_user_memory_region(s, mem);

            if (err) {

                fprintf(stderr, "%s: error updating slot: %s\n", __func__,

                        strerror(-err));

                abort();

            }

            start_addr += old.memory_size;

            phys_offset += old.memory_size;

            size -= old.memory_size;

            continue;

        }

        /* register prefix slot */

        if (old.start_addr < start_addr) {

            mem = kvm_alloc_slot(s);

            mem->memory_size = start_addr - old.start_addr;

            mem->start_addr = old.start_addr;

            mem->phys_offset = old.phys_offset;

            mem->flags = 0;

            err = kvm_set_user_memory_region(s, mem);

            if (err) {

                fprintf(stderr, "%s: error registering prefix slot: %s\n",

                        __func__, strerror(-err));

                abort();

            }

        }

        /* register suffix slot */

        if (old.start_addr + old.memory_size > start_addr + size) {

            ram_addr_t size_delta;

            mem = kvm_alloc_slot(s);

            mem->start_addr = start_addr + size;

            size_delta = mem->start_addr - old.start_addr;

            mem->memory_size = old.memory_size - size_delta;

            mem->phys_offset = old.phys_offset + size_delta;

            mem->flags = 0;

            err = kvm_set_user_memory_region(s, mem);

            if (err) {

                fprintf(stderr, "%s: error registering suffix slot: %s\n",

                        __func__, strerror(-err));

                abort();

            }

        }

    }

    /* in case the KVM bug workaround already "consumed" the new slot */

    if (!size)

        return;

    /* KVM does not need to know about this memory */

    if (flags >= IO_MEM_UNASSIGNED)

        return;

    mem = kvm_alloc_slot(s);

    mem->memory_size = size;

    mem->start_addr = start_addr;

    mem->phys_offset = phys_offset;

    mem->flags = 0;

    err = kvm_set_user_memory_region(s, mem);

    if (err) {

        fprintf(stderr, "%s: error registering slot: %s\n", __func__,

                strerror(-err));

        abort();

    }

}

static void kvm_client_set_memory(struct CPUPhysMemoryClient *client,

                                  target_phys_addr_t start_addr,

                                  ram_addr_t size,

                                  ram_addr_t phys_offset)

{

        kvm_set_phys_mem(start_addr, size, phys_offset);

}

static int kvm_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client,

                                        target_phys_addr_t start_addr,

                                        target_phys_addr_t end_addr)

{

        return kvm_physical_sync_dirty_bitmap(start_addr, end_addr);

}

static int kvm_client_migration_log(struct CPUPhysMemoryClient *client,

                                    int enable)

{

        return kvm_set_migration_log(enable);

}

static CPUPhysMemoryClient kvm_cpu_phys_memory_client = {

        .set_memory = kvm_client_set_memory,

        .sync_dirty_bitmap = kvm_client_sync_dirty_bitmap,

        .migration_log = kvm_client_migration_log,

};

int kvm_init(int smp_cpus)

{

    static const char upgrade_note[] =

        "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"

        "(see http://sourceforge.net/projects/kvm).\n";

    KVMState *s;

    int ret;

    int i;

    s = qemu_mallocz(sizeof(KVMState));

#ifdef KVM_CAP_SET_GUEST_DEBUG

    QTAILQ_INIT(&s->kvm_sw_breakpoints);

#endif

    for (i = 0; i < ARRAY_SIZE(s->slots); i++)

        s->slots[i].slot = i;

    s->vmfd = -1;

    s->fd = qemu_open("/dev/kvm", O_RDWR);

    if (s->fd == -1) {

        fprintf(stderr, "Could not access KVM kernel module: %m\n");

        ret = -errno;

        goto err;

    }

    ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);

    if (ret < KVM_API_VERSION) {

        if (ret > 0)

            ret = -EINVAL;

        fprintf(stderr, "kvm version too old\n");

        goto err;

    }

    if (ret > KVM_API_VERSION) {

        ret = -EINVAL;

        fprintf(stderr, "kvm version not supported\n");

        goto err;

    }

    s->vmfd = kvm_ioctl(s, KVM_CREATE_VM, 0);

    if (s->vmfd < 0) {

#ifdef TARGET_S390X

        fprintf(stderr, "Please add the 'switch_amode' kernel parameter to "

                        "your host kernel command line\n");

#endif

        goto err;

    }

    /* initially, KVM allocated its own memory and we had to jump through

     * hooks to make phys_ram_base point to this.  Modern versions of KVM

     * just use a user allocated buffer so we can use regular pages

     * unmodified.  Make sure we have a sufficiently modern version of KVM.

     */

    if (!kvm_check_extension(s, KVM_CAP_USER_MEMORY)) {

        ret = -EINVAL;

        fprintf(stderr, "kvm does not support KVM_CAP_USER_MEMORY\n%s",

                upgrade_note);

        goto err;

    }

    /* There was a nasty bug in < kvm-80 that prevents memory slots from being

     * destroyed properly.  Since we rely on this capability, refuse to work

     * with any kernel without this capability. */

    if (!kvm_check_extension(s, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {

        ret = -EINVAL;

        fprintf(stderr,

                "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",

                upgrade_note);

        goto err;

    }

    s->coalesced_mmio = 0;

#ifdef KVM_CAP_COALESCED_MMIO

    s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);

    s->coalesced_mmio_ring = NULL;

#endif

    s->broken_set_mem_region = 1;

#ifdef KVM_CAP_JOIN_MEMORY_REGIONS_WORKS

    ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);

    if (ret > 0) {

        s->broken_set_mem_region = 0;

    }

#endif

    s->vcpu_events = 0;

#ifdef KVM_CAP_VCPU_EVENTS

    s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);

#endif

    s->robust_singlestep = 0;

#ifdef KVM_CAP_X86_ROBUST_SINGLESTEP

    s->robust_singlestep =

        kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);

#endif

    s->debugregs = 0;

#ifdef KVM_CAP_DEBUGREGS

    s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);

#endif

    s->xsave = 0;

#ifdef KVM_CAP_XSAVE

    s->xsave = kvm_check_extension(s, KVM_CAP_XSAVE);

#endif

    s->xcrs = 0;

#ifdef KVM_CAP_XCRS

    s->xcrs = kvm_check_extension(s, KVM_CAP_XCRS);

#endif

    ret = kvm_arch_init(s, smp_cpus);

    if (ret < 0)

        goto err;

    kvm_state = s;

    cpu_register_phys_memory_client(&kvm_cpu_phys_memory_client);

    return 0;

err:

    if (s) {

        if (s->vmfd != -1)

            close(s->vmfd);

        if (s->fd != -1)

            close(s->fd);

    }

    qemu_free(s);

    return ret;

}

static int kvm_handle_io(uint16_t port, void *data, int direction, int size,

                         uint32_t count)

{

    int i;

    uint8_t *ptr = data;

    for (i = 0; i < count; i++) {

        if (direction == KVM_EXIT_IO_IN) {

            switch (size) {

            case 1:

                stb_p(ptr, cpu_inb(port));

                break;

            case 2:

                stw_p(ptr, cpu_inw(port));

                break;

            case 4:

                stl_p(ptr, cpu_inl(port));

                break;

            }

        } else {

            switch (size) {

            case 1:

                cpu_outb(port, ldub_p(ptr));

                break;

            case 2:

                cpu_outw(port, lduw_p(ptr));

                break;

            case 4:

                cpu_outl(port, ldl_p(ptr));

                break;

            }

        }

        ptr += size;

    }

    return 1;

}

#ifdef KVM_CAP_INTERNAL_ERROR_DATA

static void kvm_handle_internal_error(CPUState *env, struct kvm_run *run)

{

    if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {

        int i;

        fprintf(stderr, "KVM internal error. Suberror: %d\n",

                run->internal.suberror);

        for (i = 0; i < run->internal.ndata; ++i) {

            fprintf(stderr, "extra data[%d]: %"PRIx64"\n",

                    i, (uint64_t)run->internal.data[i]);

        }

    }

    cpu_dump_state(env, stderr, fprintf, 0);

    if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {

        fprintf(stderr, "emulation failure\n");

        if (!kvm_arch_stop_on_emulation_error(env))

                return;

    }

    /* FIXME: Should trigger a qmp message to let management know

     * something went wrong.

     */

    vm_stop(0);

}

#endif

void kvm_flush_coalesced_mmio_buffer(void)

{

#ifdef KVM_CAP_COALESCED_MMIO

    KVMState *s = kvm_state;

    if (s->coalesced_mmio_ring) {

        struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;

        while (ring->first != ring->last) {

            struct kvm_coalesced_mmio *ent;

            ent = &ring->coalesced_mmio[ring->first];

            cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);

            smp_wmb();

            ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;

        }

    }

#endif

}

static void do_kvm_cpu_synchronize_state(void *_env)

{

    CPUState *env = _env;

    if (!env->kvm_vcpu_dirty) {

        kvm_arch_get_registers(env);

        env->kvm_vcpu_dirty = 1;

    }

}

void kvm_cpu_synchronize_state(CPUState *env)

{

    if (!env->kvm_vcpu_dirty)

        run_on_cpu(env, do_kvm_cpu_synchronize_state, env);

}

void kvm_cpu_synchronize_post_reset(CPUState *env)

{

    kvm_arch_put_registers(env, KVM_PUT_RESET_STATE);

    env->kvm_vcpu_dirty = 0;

}

void kvm_cpu_synchronize_post_init(CPUState *env)

{

    kvm_arch_put_registers(env, KVM_PUT_FULL_STATE);

    env->kvm_vcpu_dirty = 0;

}

int kvm_cpu_exec(CPUState *env)

{

    struct kvm_run *run = env->kvm_run;

    int ret;

    DPRINTF("kvm_cpu_exec()\n");

    do {

#ifndef CONFIG_IOTHREAD

        if (env->exit_request) {

            DPRINTF("interrupt exit requested\n");

            ret = 0;

            break;

        }

#endif

        if (kvm_arch_process_irqchip_events(env)) {

            ret = 0;

            break;

        }

        if (env->kvm_vcpu_dirty) {

            kvm_arch_put_registers(env, KVM_PUT_RUNTIME_STATE);

            env->kvm_vcpu_dirty = 0;

        }

        kvm_arch_pre_run(env, run);

        cpu_single_env = NULL;

        qemu_mutex_unlock_iothread();

        ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);

        qemu_mutex_lock_iothread();

        cpu_single_env = env;

        kvm_arch_post_run(env, run);

        if (ret == -EINTR || ret == -EAGAIN) {

            cpu_exit(env);

            DPRINTF("io window exit\n");

            ret = 0;

            break;

        }

        if (ret < 0) {

            DPRINTF("kvm run failed %s\n", strerror(-ret));

            abort();

        }

        kvm_flush_coalesced_mmio_buffer();

        ret = 0; /* exit loop */

        switch (run->exit_reason) {

        case KVM_EXIT_IO:

            DPRINTF("handle_io\n");

            ret = kvm_handle_io(run->io.port,

                                (uint8_t *)run + run->io.data_offset,

                                run->io.direction,

                                run->io.size,

                                run->io.count);

            break;

        case KVM_EXIT_MMIO: