Adding qemu as a submodule of KVMFORNFV

This Patch includes the changes to add qemu as a submodule to
kvmfornfv repo and make use of the updated latest qemu for the
execution of all testcase
Change-Id: I1280af507a857675c7f81d30c95255635667bdd7
Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>

1 files changed, 0 insertions, 1810 deletions

diff --git a/qemu/migration/migration.c b/qemu/migration/migration.c
deleted file mode 100644
index 991313a86..000000000
--- a/qemu/migration/migration.c
+++ /dev/null
@@ -1,1810 +0,0 @@
-/*
- * QEMU live migration
- *
- * Copyright IBM, Corp. 2008
- *
- * Authors:
- *  Anthony Liguori   <aliguori@us.ibm.com>
- *
- * This work is licensed under the terms of the GNU GPL, version 2.  See
- * the COPYING file in the top-level directory.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include "qemu/osdep.h"
-#include "qemu/cutils.h"
-#include "qemu/error-report.h"
-#include "qemu/main-loop.h"
-#include "migration/migration.h"
-#include "migration/qemu-file.h"
-#include "sysemu/sysemu.h"
-#include "block/block.h"
-#include "qapi/qmp/qerror.h"
-#include "qapi/util.h"
-#include "qemu/sockets.h"
-#include "qemu/rcu.h"
-#include "migration/block.h"
-#include "migration/postcopy-ram.h"
-#include "qemu/thread.h"
-#include "qmp-commands.h"
-#include "trace.h"
-#include "qapi-event.h"
-#include "qom/cpu.h"
-#include "exec/memory.h"
-#include "exec/address-spaces.h"
-
-#define MAX_THROTTLE  (32 << 20)      /* Migration transfer speed throttling */
-
-/* Amount of time to allocate to each "chunk" of bandwidth-throttled
- * data. */
-#define BUFFER_DELAY     100
-#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
-
-/* Default compression thread count */
-#define DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT 8
-/* Default decompression thread count, usually decompression is at
- * least 4 times as fast as compression.*/
-#define DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT 2
-/*0: means nocompress, 1: best speed, ... 9: best compress ratio */
-#define DEFAULT_MIGRATE_COMPRESS_LEVEL 1
-/* Define default autoconverge cpu throttle migration parameters */
-#define DEFAULT_MIGRATE_X_CPU_THROTTLE_INITIAL 20
-#define DEFAULT_MIGRATE_X_CPU_THROTTLE_INCREMENT 10
-
-/* Migration XBZRLE default cache size */
-#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024)
-
-static NotifierList migration_state_notifiers =
-    NOTIFIER_LIST_INITIALIZER(migration_state_notifiers);
-
-static bool deferred_incoming;
-
-/*
- * Current state of incoming postcopy; note this is not part of
- * MigrationIncomingState since it's state is used during cleanup
- * at the end as MIS is being freed.
- */
-static PostcopyState incoming_postcopy_state;
-
-/* When we add fault tolerance, we could have several
-   migrations at once.  For now we don't need to add
-   dynamic creation of migration */
-
-/* For outgoing */
-MigrationState *migrate_get_current(void)
-{
-    static bool once;
-    static MigrationState current_migration = {
-        .state = MIGRATION_STATUS_NONE,
-        .bandwidth_limit = MAX_THROTTLE,
-        .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE,
-        .mbps = -1,
-        .parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] =
-                DEFAULT_MIGRATE_COMPRESS_LEVEL,
-        .parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] =
-                DEFAULT_MIGRATE_COMPRESS_THREAD_COUNT,
-        .parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
-                DEFAULT_MIGRATE_DECOMPRESS_THREAD_COUNT,
-        .parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] =
-                DEFAULT_MIGRATE_X_CPU_THROTTLE_INITIAL,
-        .parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] =
-                DEFAULT_MIGRATE_X_CPU_THROTTLE_INCREMENT,
-    };
-
-    if (!once) {
-        qemu_mutex_init(&current_migration.src_page_req_mutex);
-        once = true;
-    }
-    return &current_migration;
-}
-
-/* For incoming */
-static MigrationIncomingState *mis_current;
-
-MigrationIncomingState *migration_incoming_get_current(void)
-{
-    return mis_current;
-}
-
-MigrationIncomingState *migration_incoming_state_new(QEMUFile* f)
-{
-    mis_current = g_new0(MigrationIncomingState, 1);
-    mis_current->from_src_file = f;
-    mis_current->state = MIGRATION_STATUS_NONE;
-    QLIST_INIT(&mis_current->loadvm_handlers);
-    qemu_mutex_init(&mis_current->rp_mutex);
-    qemu_event_init(&mis_current->main_thread_load_event, false);
-
-    return mis_current;
-}
-
-void migration_incoming_state_destroy(void)
-{
-    qemu_event_destroy(&mis_current->main_thread_load_event);
-    loadvm_free_handlers(mis_current);
-    g_free(mis_current);
-    mis_current = NULL;
-}
-
-
-typedef struct {
-    bool optional;
-    uint32_t size;
-    uint8_t runstate[100];
-    RunState state;
-    bool received;
-} GlobalState;
-
-static GlobalState global_state;
-
-int global_state_store(void)
-{
-    if (!runstate_store((char *)global_state.runstate,
-                        sizeof(global_state.runstate))) {
-        error_report("runstate name too big: %s", global_state.runstate);
-        trace_migrate_state_too_big();
-        return -EINVAL;
-    }
-    return 0;
-}
-
-void global_state_store_running(void)
-{
-    const char *state = RunState_lookup[RUN_STATE_RUNNING];
-    strncpy((char *)global_state.runstate,
-           state, sizeof(global_state.runstate));
-}
-
-static bool global_state_received(void)
-{
-    return global_state.received;
-}
-
-static RunState global_state_get_runstate(void)
-{
-    return global_state.state;
-}
-
-void global_state_set_optional(void)
-{
-    global_state.optional = true;
-}
-
-static bool global_state_needed(void *opaque)
-{
-    GlobalState *s = opaque;
-    char *runstate = (char *)s->runstate;
-
-    /* If it is not optional, it is mandatory */
-
-    if (s->optional == false) {
-        return true;
-    }
-
-    /* If state is running or paused, it is not needed */
-
-    if (strcmp(runstate, "running") == 0 ||
-        strcmp(runstate, "paused") == 0) {
-        return false;
-    }
-
-    /* for any other state it is needed */
-    return true;
-}
-
-static int global_state_post_load(void *opaque, int version_id)
-{
-    GlobalState *s = opaque;
-    Error *local_err = NULL;
-    int r;
-    char *runstate = (char *)s->runstate;
-
-    s->received = true;
-    trace_migrate_global_state_post_load(runstate);
-
-    r = qapi_enum_parse(RunState_lookup, runstate, RUN_STATE__MAX,
-                                -1, &local_err);
-
-    if (r == -1) {
-        if (local_err) {
-            error_report_err(local_err);
-        }
-        return -EINVAL;
-    }
-    s->state = r;
-
-    return 0;
-}
-
-static void global_state_pre_save(void *opaque)
-{
-    GlobalState *s = opaque;
-
-    trace_migrate_global_state_pre_save((char *)s->runstate);
-    s->size = strlen((char *)s->runstate) + 1;
-}
-
-static const VMStateDescription vmstate_globalstate = {
-    .name = "globalstate",
-    .version_id = 1,
-    .minimum_version_id = 1,
-    .post_load = global_state_post_load,
-    .pre_save = global_state_pre_save,
-    .needed = global_state_needed,
-    .fields = (VMStateField[]) {
-        VMSTATE_UINT32(size, GlobalState),
-        VMSTATE_BUFFER(runstate, GlobalState),
-        VMSTATE_END_OF_LIST()
-    },
-};
-
-void register_global_state(void)
-{
-    /* We would use it independently that we receive it */
-    strcpy((char *)&global_state.runstate, "");
-    global_state.received = false;
-    vmstate_register(NULL, 0, &vmstate_globalstate, &global_state);
-}
-
-static void migrate_generate_event(int new_state)
-{
-    if (migrate_use_events()) {
-        qapi_event_send_migration(new_state, &error_abort);
-    }
-}
-
-/*
- * Called on -incoming with a defer: uri.
- * The migration can be started later after any parameters have been
- * changed.
- */
-static void deferred_incoming_migration(Error **errp)
-{
-    if (deferred_incoming) {
-        error_setg(errp, "Incoming migration already deferred");
-    }
-    deferred_incoming = true;
-}
-
-/* Request a range of pages from the source VM at the given
- * start address.
- *   rbname: Name of the RAMBlock to request the page in, if NULL it's the same
- *           as the last request (a name must have been given previously)
- *   Start: Address offset within the RB
- *   Len: Length in bytes required - must be a multiple of pagesize
- */
-void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
-                               ram_addr_t start, size_t len)
-{
-    uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname upto 256 */
-    size_t msglen = 12; /* start + len */
-
-    *(uint64_t *)bufc = cpu_to_be64((uint64_t)start);
-    *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len);
-
-    if (rbname) {
-        int rbname_len = strlen(rbname);
-        assert(rbname_len < 256);
-
-        bufc[msglen++] = rbname_len;
-        memcpy(bufc + msglen, rbname, rbname_len);
-        msglen += rbname_len;
-        migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc);
-    } else {
-        migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc);
-    }
-}
-
-void qemu_start_incoming_migration(const char *uri, Error **errp)
-{
-    const char *p;
-
-    qapi_event_send_migration(MIGRATION_STATUS_SETUP, &error_abort);
-    if (!strcmp(uri, "defer")) {
-        deferred_incoming_migration(errp);
-    } else if (strstart(uri, "tcp:", &p)) {
-        tcp_start_incoming_migration(p, errp);
-#ifdef CONFIG_RDMA
-    } else if (strstart(uri, "rdma:", &p)) {
-        rdma_start_incoming_migration(p, errp);
-#endif
-#if !defined(WIN32)
-    } else if (strstart(uri, "exec:", &p)) {
-        exec_start_incoming_migration(p, errp);
-    } else if (strstart(uri, "unix:", &p)) {
-        unix_start_incoming_migration(p, errp);
-    } else if (strstart(uri, "fd:", &p)) {
-        fd_start_incoming_migration(p, errp);
-#endif
-    } else {
-        error_setg(errp, "unknown migration protocol: %s", uri);
-    }
-}
-
-static void process_incoming_migration_bh(void *opaque)
-{
-    Error *local_err = NULL;
-    MigrationIncomingState *mis = opaque;
-
-    /* Make sure all file formats flush their mutable metadata */
-    bdrv_invalidate_cache_all(&local_err);
-    if (local_err) {
-        migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
-                          MIGRATION_STATUS_FAILED);
-        error_report_err(local_err);
-        migrate_decompress_threads_join();
-        exit(EXIT_FAILURE);
-    }
-
-    /*
-     * This must happen after all error conditions are dealt with and
-     * we're sure the VM is going to be running on this host.
-     */
-    qemu_announce_self();
-
-    /* If global state section was not received or we are in running
-       state, we need to obey autostart. Any other state is set with
-       runstate_set. */
-
-    if (!global_state_received() ||
-        global_state_get_runstate() == RUN_STATE_RUNNING) {
-        if (autostart) {
-            vm_start();
-        } else {
-            runstate_set(RUN_STATE_PAUSED);
-        }
-    } else {
-        runstate_set(global_state_get_runstate());
-    }
-    migrate_decompress_threads_join();
-    /*
-     * This must happen after any state changes since as soon as an external
-     * observer sees this event they might start to prod at the VM assuming
-     * it's ready to use.
-     */
-    migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
-                      MIGRATION_STATUS_COMPLETED);
-    qemu_bh_delete(mis->bh);
-    migration_incoming_state_destroy();
-}
-
-static void process_incoming_migration_co(void *opaque)
-{
-    QEMUFile *f = opaque;
-    MigrationIncomingState *mis;
-    PostcopyState ps;
-    int ret;
-
-    mis = migration_incoming_state_new(f);
-    postcopy_state_set(POSTCOPY_INCOMING_NONE);
-    migrate_set_state(&mis->state, MIGRATION_STATUS_NONE,
-                      MIGRATION_STATUS_ACTIVE);
-    ret = qemu_loadvm_state(f);
-
-    ps = postcopy_state_get();
-    trace_process_incoming_migration_co_end(ret, ps);
-    if (ps != POSTCOPY_INCOMING_NONE) {
-        if (ps == POSTCOPY_INCOMING_ADVISE) {
-            /*
-             * Where a migration had postcopy enabled (and thus went to advise)
-             * but managed to complete within the precopy period, we can use
-             * the normal exit.
-             */
-            postcopy_ram_incoming_cleanup(mis);
-        } else if (ret >= 0) {
-            /*
-             * Postcopy was started, cleanup should happen at the end of the
-             * postcopy thread.
-             */
-            trace_process_incoming_migration_co_postcopy_end_main();
-            return;
-        }
-        /* Else if something went wrong then just fall out of the normal exit */
-    }
-
-    qemu_fclose(f);
-    free_xbzrle_decoded_buf();
-
-    if (ret < 0) {
-        migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE,
-                          MIGRATION_STATUS_FAILED);
-        error_report("load of migration failed: %s", strerror(-ret));
-        migrate_decompress_threads_join();
-        exit(EXIT_FAILURE);
-    }
-
-    mis->bh = qemu_bh_new(process_incoming_migration_bh, mis);
-    qemu_bh_schedule(mis->bh);
-}
-
-void process_incoming_migration(QEMUFile *f)
-{
-    Coroutine *co = qemu_coroutine_create(process_incoming_migration_co);
-    int fd = qemu_get_fd(f);
-
-    assert(fd != -1);
-    migrate_decompress_threads_create();
-    qemu_set_nonblock(fd);
-    qemu_coroutine_enter(co, f);
-}
-
-/*
- * Send a message on the return channel back to the source
- * of the migration.
- */
-void migrate_send_rp_message(MigrationIncomingState *mis,
-                             enum mig_rp_message_type message_type,
-                             uint16_t len, void *data)
-{
-    trace_migrate_send_rp_message((int)message_type, len);
-    qemu_mutex_lock(&mis->rp_mutex);
-    qemu_put_be16(mis->to_src_file, (unsigned int)message_type);
-    qemu_put_be16(mis->to_src_file, len);
-    qemu_put_buffer(mis->to_src_file, data, len);
-    qemu_fflush(mis->to_src_file);
-    qemu_mutex_unlock(&mis->rp_mutex);
-}
-
-/*
- * Send a 'SHUT' message on the return channel with the given value
- * to indicate that we've finished with the RP.  Non-0 value indicates
- * error.
- */
-void migrate_send_rp_shut(MigrationIncomingState *mis,
-                          uint32_t value)
-{
-    uint32_t buf;
-
-    buf = cpu_to_be32(value);
-    migrate_send_rp_message(mis, MIG_RP_MSG_SHUT, sizeof(buf), &buf);
-}
-
-/*
- * Send a 'PONG' message on the return channel with the given value
- * (normally in response to a 'PING')
- */
-void migrate_send_rp_pong(MigrationIncomingState *mis,
-                          uint32_t value)
-{
-    uint32_t buf;
-
-    buf = cpu_to_be32(value);
-    migrate_send_rp_message(mis, MIG_RP_MSG_PONG, sizeof(buf), &buf);
-}
-
-/* amount of nanoseconds we are willing to wait for migration to be down.
- * the choice of nanoseconds is because it is the maximum resolution that
- * get_clock() can achieve. It is an internal measure. All user-visible
- * units must be in seconds */
-static uint64_t max_downtime = 300000000;
-
-uint64_t migrate_max_downtime(void)
-{
-    return max_downtime;
-}
-
-MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp)
-{
-    MigrationCapabilityStatusList *head = NULL;
-    MigrationCapabilityStatusList *caps;
-    MigrationState *s = migrate_get_current();
-    int i;
-
-    caps = NULL; /* silence compiler warning */
-    for (i = 0; i < MIGRATION_CAPABILITY__MAX; i++) {
-        if (head == NULL) {
-            head = g_malloc0(sizeof(*caps));
-            caps = head;
-        } else {
-            caps->next = g_malloc0(sizeof(*caps));
-            caps = caps->next;
-        }
-        caps->value =
-            g_malloc(sizeof(*caps->value));
-        caps->value->capability = i;
-        caps->value->state = s->enabled_capabilities[i];
-    }
-
-    return head;
-}
-
-MigrationParameters *qmp_query_migrate_parameters(Error **errp)
-{
-    MigrationParameters *params;
-    MigrationState *s = migrate_get_current();
-
-    params = g_malloc0(sizeof(*params));
-    params->compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL];
-    params->compress_threads =
-            s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
-    params->decompress_threads =
-            s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
-    params->x_cpu_throttle_initial =
-            s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL];
-    params->x_cpu_throttle_increment =
-            s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT];
-
-    return params;
-}
-
-/*
- * Return true if we're already in the middle of a migration
- * (i.e. any of the active or setup states)
- */
-static bool migration_is_setup_or_active(int state)
-{
-    switch (state) {
-    case MIGRATION_STATUS_ACTIVE:
-    case MIGRATION_STATUS_POSTCOPY_ACTIVE:
-    case MIGRATION_STATUS_SETUP:
-        return true;
-
-    default:
-        return false;
-
-    }
-}
-
-static void get_xbzrle_cache_stats(MigrationInfo *info)
-{
-    if (migrate_use_xbzrle()) {
-        info->has_xbzrle_cache = true;
-        info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
-        info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size();
-        info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred();
-        info->xbzrle_cache->pages = xbzrle_mig_pages_transferred();
-        info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss();
-        info->xbzrle_cache->cache_miss_rate = xbzrle_mig_cache_miss_rate();
-        info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow();
-    }
-}
-
-MigrationInfo *qmp_query_migrate(Error **errp)
-{
-    MigrationInfo *info = g_malloc0(sizeof(*info));
-    MigrationState *s = migrate_get_current();
-
-    switch (s->state) {
-    case MIGRATION_STATUS_NONE:
-        /* no migration has happened ever */
-        break;
-    case MIGRATION_STATUS_SETUP:
-        info->has_status = true;
-        info->has_total_time = false;
-        break;
-    case MIGRATION_STATUS_ACTIVE:
-    case MIGRATION_STATUS_CANCELLING:
-        info->has_status = true;
-        info->has_total_time = true;
-        info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
-            - s->total_time;
-        info->has_expected_downtime = true;
-        info->expected_downtime = s->expected_downtime;
-        info->has_setup_time = true;
-        info->setup_time = s->setup_time;
-
-        info->has_ram = true;
-        info->ram = g_malloc0(sizeof(*info->ram));
-        info->ram->transferred = ram_bytes_transferred();
-        info->ram->remaining = ram_bytes_remaining();
-        info->ram->total = ram_bytes_total();
-        info->ram->duplicate = dup_mig_pages_transferred();
-        info->ram->skipped = skipped_mig_pages_transferred();
-        info->ram->normal = norm_mig_pages_transferred();
-        info->ram->normal_bytes = norm_mig_bytes_transferred();
-        info->ram->dirty_pages_rate = s->dirty_pages_rate;
-        info->ram->mbps = s->mbps;
-        info->ram->dirty_sync_count = s->dirty_sync_count;
-
-        if (blk_mig_active()) {
-            info->has_disk = true;
-            info->disk = g_malloc0(sizeof(*info->disk));
-            info->disk->transferred = blk_mig_bytes_transferred();
-            info->disk->remaining = blk_mig_bytes_remaining();
-            info->disk->total = blk_mig_bytes_total();
-        }
-
-        if (cpu_throttle_active()) {
-            info->has_x_cpu_throttle_percentage = true;
-            info->x_cpu_throttle_percentage = cpu_throttle_get_percentage();
-        }
-
-        get_xbzrle_cache_stats(info);
-        break;
-    case MIGRATION_STATUS_POSTCOPY_ACTIVE:
-        /* Mostly the same as active; TODO add some postcopy stats */
-        info->has_status = true;
-        info->has_total_time = true;
-        info->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME)
-            - s->total_time;
-        info->has_expected_downtime = true;
-        info->expected_downtime = s->expected_downtime;
-        info->has_setup_time = true;
-        info->setup_time = s->setup_time;
-
-        info->has_ram = true;
-        info->ram = g_malloc0(sizeof(*info->ram));
-        info->ram->transferred = ram_bytes_transferred();
-        info->ram->remaining = ram_bytes_remaining();
-        info->ram->total = ram_bytes_total();
-        info->ram->duplicate = dup_mig_pages_transferred();
-        info->ram->skipped = skipped_mig_pages_transferred();
-        info->ram->normal = norm_mig_pages_transferred();
-        info->ram->normal_bytes = norm_mig_bytes_transferred();
-        info->ram->dirty_pages_rate = s->dirty_pages_rate;
-        info->ram->mbps = s->mbps;
-        info->ram->dirty_sync_count = s->dirty_sync_count;
-
-        if (blk_mig_active()) {
-            info->has_disk = true;
-            info->disk = g_malloc0(sizeof(*info->disk));
-            info->disk->transferred = blk_mig_bytes_transferred();
-            info->disk->remaining = blk_mig_bytes_remaining();
-            info->disk->total = blk_mig_bytes_total();
-        }
-
-        get_xbzrle_cache_stats(info);
-        break;
-    case MIGRATION_STATUS_COMPLETED:
-        get_xbzrle_cache_stats(info);
-
-        info->has_status = true;
-        info->has_total_time = true;
-        info->total_time = s->total_time;
-        info->has_downtime = true;
-        info->downtime = s->downtime;
-        info->has_setup_time = true;
-        info->setup_time = s->setup_time;
-
-        info->has_ram = true;
-        info->ram = g_malloc0(sizeof(*info->ram));
-        info->ram->transferred = ram_bytes_transferred();
-        info->ram->remaining = 0;
-        info->ram->total = ram_bytes_total();
-        info->ram->duplicate = dup_mig_pages_transferred();
-        info->ram->skipped = skipped_mig_pages_transferred();
-        info->ram->normal = norm_mig_pages_transferred();
-        info->ram->normal_bytes = norm_mig_bytes_transferred();
-        info->ram->mbps = s->mbps;
-        info->ram->dirty_sync_count = s->dirty_sync_count;
-        break;
-    case MIGRATION_STATUS_FAILED:
-        info->has_status = true;
-        break;
-    case MIGRATION_STATUS_CANCELLED:
-        info->has_status = true;
-        break;
-    }
-    info->status = s->state;
-
-    return info;
-}
-
-void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
-                                  Error **errp)
-{
-    MigrationState *s = migrate_get_current();
-    MigrationCapabilityStatusList *cap;
-
-    if (migration_is_setup_or_active(s->state)) {
-        error_setg(errp, QERR_MIGRATION_ACTIVE);
-        return;
-    }
-
-    for (cap = params; cap; cap = cap->next) {
-        s->enabled_capabilities[cap->value->capability] = cap->value->state;
-    }
-
-    if (migrate_postcopy_ram()) {
-        if (migrate_use_compression()) {
-            /* The decompression threads asynchronously write into RAM
-             * rather than use the atomic copies needed to avoid
-             * userfaulting.  It should be possible to fix the decompression
-             * threads for compatibility in future.
-             */
-            error_report("Postcopy is not currently compatible with "
-                         "compression");
-            s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM] =
-                false;
-        }
-    }
-}
-
-void qmp_migrate_set_parameters(bool has_compress_level,
-                                int64_t compress_level,
-                                bool has_compress_threads,
-                                int64_t compress_threads,
-                                bool has_decompress_threads,
-                                int64_t decompress_threads,
-                                bool has_x_cpu_throttle_initial,
-                                int64_t x_cpu_throttle_initial,
-                                bool has_x_cpu_throttle_increment,
-                                int64_t x_cpu_throttle_increment, Error **errp)
-{
-    MigrationState *s = migrate_get_current();
-
-    if (has_compress_level && (compress_level < 0 || compress_level > 9)) {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "compress_level",
-                   "is invalid, it should be in the range of 0 to 9");
-        return;
-    }
-    if (has_compress_threads &&
-            (compress_threads < 1 || compress_threads > 255)) {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                   "compress_threads",
-                   "is invalid, it should be in the range of 1 to 255");
-        return;
-    }
-    if (has_decompress_threads &&
-            (decompress_threads < 1 || decompress_threads > 255)) {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                   "decompress_threads",
-                   "is invalid, it should be in the range of 1 to 255");
-        return;
-    }
-    if (has_x_cpu_throttle_initial &&
-            (x_cpu_throttle_initial < 1 || x_cpu_throttle_initial > 99)) {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                   "x_cpu_throttle_initial",
-                   "an integer in the range of 1 to 99");
-    }
-    if (has_x_cpu_throttle_increment &&
-            (x_cpu_throttle_increment < 1 || x_cpu_throttle_increment > 99)) {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
-                   "x_cpu_throttle_increment",
-                   "an integer in the range of 1 to 99");
-    }
-
-    if (has_compress_level) {
-        s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level;
-    }
-    if (has_compress_threads) {
-        s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = compress_threads;
-    }
-    if (has_decompress_threads) {
-        s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] =
-                                                    decompress_threads;
-    }
-    if (has_x_cpu_throttle_initial) {
-        s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] =
-                                                    x_cpu_throttle_initial;
-    }
-
-    if (has_x_cpu_throttle_increment) {
-        s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] =
-                                                    x_cpu_throttle_increment;
-    }
-}
-
-void qmp_migrate_start_postcopy(Error **errp)
-{
-    MigrationState *s = migrate_get_current();
-
-    if (!migrate_postcopy_ram()) {
-        error_setg(errp, "Enable postcopy with migrate_set_capability before"
-                         " the start of migration");
-        return;
-    }
-
-    if (s->state == MIGRATION_STATUS_NONE) {
-        error_setg(errp, "Postcopy must be started after migration has been"
-                         " started");
-        return;
-    }
-    /*
-     * we don't error if migration has finished since that would be racy
-     * with issuing this command.
-     */
-    atomic_set(&s->start_postcopy, true);
-}
-
-/* shared migration helpers */
-
-void migrate_set_state(int *state, int old_state, int new_state)
-{
-    if (atomic_cmpxchg(state, old_state, new_state) == old_state) {
-        trace_migrate_set_state(new_state);
-        migrate_generate_event(new_state);
-    }
-}
-
-static void migrate_fd_cleanup(void *opaque)
-{
-    MigrationState *s = opaque;
-
-    qemu_bh_delete(s->cleanup_bh);
-    s->cleanup_bh = NULL;
-
-    flush_page_queue(s);
-
-    if (s->to_dst_file) {
-        trace_migrate_fd_cleanup();
-        qemu_mutex_unlock_iothread();
-        if (s->migration_thread_running) {
-            qemu_thread_join(&s->thread);
-            s->migration_thread_running = false;
-        }
-        qemu_mutex_lock_iothread();
-
-        migrate_compress_threads_join();
-        qemu_fclose(s->to_dst_file);
-        s->to_dst_file = NULL;
-    }
-
-    assert((s->state != MIGRATION_STATUS_ACTIVE) &&
-           (s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE));
-
-    if (s->state == MIGRATION_STATUS_CANCELLING) {
-        migrate_set_state(&s->state, MIGRATION_STATUS_CANCELLING,
-                          MIGRATION_STATUS_CANCELLED);
-    }
-
-    notifier_list_notify(&migration_state_notifiers, s);
-}
-
-void migrate_fd_error(MigrationState *s)
-{
-    trace_migrate_fd_error();
-    assert(s->to_dst_file == NULL);
-    migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
-                      MIGRATION_STATUS_FAILED);
-    notifier_list_notify(&migration_state_notifiers, s);
-}
-
-static void migrate_fd_cancel(MigrationState *s)
-{
-    int old_state ;
-    QEMUFile *f = migrate_get_current()->to_dst_file;
-    trace_migrate_fd_cancel();
-
-    if (s->rp_state.from_dst_file) {
-        /* shutdown the rp socket, so causing the rp thread to shutdown */
-        qemu_file_shutdown(s->rp_state.from_dst_file);
-    }
-
-    do {
-        old_state = s->state;
-        if (!migration_is_setup_or_active(old_state)) {
-            break;
-        }
-        migrate_set_state(&s->state, old_state, MIGRATION_STATUS_CANCELLING);
-    } while (s->state != MIGRATION_STATUS_CANCELLING);
-
-    /*
-     * If we're unlucky the migration code might be stuck somewhere in a
-     * send/write while the network has failed and is waiting to timeout;
-     * if we've got shutdown(2) available then we can force it to quit.
-     * The outgoing qemu file gets closed in migrate_fd_cleanup that is
-     * called in a bh, so there is no race against this cancel.
-     */
-    if (s->state == MIGRATION_STATUS_CANCELLING && f) {
-        qemu_file_shutdown(f);
-    }
-}
-
-void add_migration_state_change_notifier(Notifier *notify)
-{
-    notifier_list_add(&migration_state_notifiers, notify);
-}
-
-void remove_migration_state_change_notifier(Notifier *notify)
-{
-    notifier_remove(notify);
-}
-
-bool migration_in_setup(MigrationState *s)
-{
-    return s->state == MIGRATION_STATUS_SETUP;
-}
-
-bool migration_has_finished(MigrationState *s)
-{
-    return s->state == MIGRATION_STATUS_COMPLETED;
-}
-
-bool migration_has_failed(MigrationState *s)
-{
-    return (s->state == MIGRATION_STATUS_CANCELLED ||
-            s->state == MIGRATION_STATUS_FAILED);
-}
-
-bool migration_in_postcopy(MigrationState *s)
-{
-    return (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE);
-}
-
-bool migration_in_postcopy_after_devices(MigrationState *s)
-{
-    return migration_in_postcopy(s) && s->postcopy_after_devices;
-}
-
-MigrationState *migrate_init(const MigrationParams *params)
-{
-    MigrationState *s = migrate_get_current();
-
-    /*
-     * Reinitialise all migration state, except
-     * parameters/capabilities that the user set, and
-     * locks.
-     */
-    s->bytes_xfer = 0;
-    s->xfer_limit = 0;
-    s->cleanup_bh = 0;
-    s->to_dst_file = NULL;
-    s->state = MIGRATION_STATUS_NONE;
-    s->params = *params;
-    s->rp_state.from_dst_file = NULL;
-    s->rp_state.error = false;
-    s->mbps = 0.0;
-    s->downtime = 0;
-    s->expected_downtime = 0;
-    s->dirty_pages_rate = 0;
-    s->dirty_bytes_rate = 0;
-    s->setup_time = 0;
-    s->dirty_sync_count = 0;
-    s->start_postcopy = false;
-    s->postcopy_after_devices = false;
-    s->migration_thread_running = false;
-    s->last_req_rb = NULL;
-
-    migrate_set_state(&s->state, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP);
-
-    QSIMPLEQ_INIT(&s->src_page_requests);
-
-    s->total_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-    return s;
-}
-
-static GSList *migration_blockers;
-
-void migrate_add_blocker(Error *reason)
-{
-    migration_blockers = g_slist_prepend(migration_blockers, reason);
-}
-
-void migrate_del_blocker(Error *reason)
-{
-    migration_blockers = g_slist_remove(migration_blockers, reason);
-}
-
-void qmp_migrate_incoming(const char *uri, Error **errp)
-{
-    Error *local_err = NULL;
-    static bool once = true;
-
-    if (!deferred_incoming) {
-        error_setg(errp, "For use with '-incoming defer'");
-        return;
-    }
-    if (!once) {
-        error_setg(errp, "The incoming migration has already been started");
-    }
-
-    qemu_start_incoming_migration(uri, &local_err);
-
-    if (local_err) {
-        error_propagate(errp, local_err);
-        return;
-    }
-
-    once = false;
-}
-
-void qmp_migrate(const char *uri, bool has_blk, bool blk,
-                 bool has_inc, bool inc, bool has_detach, bool detach,
-                 Error **errp)
-{
-    Error *local_err = NULL;
-    MigrationState *s = migrate_get_current();
-    MigrationParams params;
-    const char *p;
-
-    params.blk = has_blk && blk;
-    params.shared = has_inc && inc;
-
-    if (migration_is_setup_or_active(s->state) ||
-        s->state == MIGRATION_STATUS_CANCELLING) {
-        error_setg(errp, QERR_MIGRATION_ACTIVE);
-        return;
-    }
-    if (runstate_check(RUN_STATE_INMIGRATE)) {
-        error_setg(errp, "Guest is waiting for an incoming migration");
-        return;
-    }
-
-    if (qemu_savevm_state_blocked(errp)) {
-        return;
-    }
-
-    if (migration_blockers) {
-        *errp = error_copy(migration_blockers->data);
-        return;
-    }
-
-    s = migrate_init(&params);
-
-    if (strstart(uri, "tcp:", &p)) {
-        tcp_start_outgoing_migration(s, p, &local_err);
-#ifdef CONFIG_RDMA
-    } else if (strstart(uri, "rdma:", &p)) {
-        rdma_start_outgoing_migration(s, p, &local_err);
-#endif
-#if !defined(WIN32)
-    } else if (strstart(uri, "exec:", &p)) {
-        exec_start_outgoing_migration(s, p, &local_err);
-    } else if (strstart(uri, "unix:", &p)) {
-        unix_start_outgoing_migration(s, p, &local_err);
-    } else if (strstart(uri, "fd:", &p)) {
-        fd_start_outgoing_migration(s, p, &local_err);
-#endif
-    } else {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "uri",
-                   "a valid migration protocol");
-        migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
-                          MIGRATION_STATUS_FAILED);
-        return;
-    }
-
-    if (local_err) {
-        migrate_fd_error(s);
-        error_propagate(errp, local_err);
-        return;
-    }
-}
-
-void qmp_migrate_cancel(Error **errp)
-{
-    migrate_fd_cancel(migrate_get_current());
-}
-
-void qmp_migrate_set_cache_size(int64_t value, Error **errp)
-{
-    MigrationState *s = migrate_get_current();
-    int64_t new_size;
-
-    /* Check for truncation */
-    if (value != (size_t)value) {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
-                   "exceeding address space");
-        return;
-    }
-
-    /* Cache should not be larger than guest ram size */
-    if (value > ram_bytes_total()) {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
-                   "exceeds guest ram size ");
-        return;
-    }
-
-    new_size = xbzrle_cache_resize(value);
-    if (new_size < 0) {
-        error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
-                   "is smaller than page size");
-        return;
-    }
-
-    s->xbzrle_cache_size = new_size;
-}
-
-int64_t qmp_query_migrate_cache_size(Error **errp)
-{
-    return migrate_xbzrle_cache_size();
-}
-
-void qmp_migrate_set_speed(int64_t value, Error **errp)
-{
-    MigrationState *s;
-
-    if (value < 0) {
-        value = 0;
-    }
-    if (value > SIZE_MAX) {
-        value = SIZE_MAX;
-    }
-
-    s = migrate_get_current();
-    s->bandwidth_limit = value;
-    if (s->to_dst_file) {
-        qemu_file_set_rate_limit(s->to_dst_file,
-                                 s->bandwidth_limit / XFER_LIMIT_RATIO);
-    }
-}
-
-void qmp_migrate_set_downtime(double value, Error **errp)
-{
-    value *= 1e9;
-    value = MAX(0, MIN(UINT64_MAX, value));
-    max_downtime = (uint64_t)value;
-}
-
-bool migrate_postcopy_ram(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->enabled_capabilities[MIGRATION_CAPABILITY_POSTCOPY_RAM];
-}
-
-bool migrate_auto_converge(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->enabled_capabilities[MIGRATION_CAPABILITY_AUTO_CONVERGE];
-}
-
-bool migrate_zero_blocks(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->enabled_capabilities[MIGRATION_CAPABILITY_ZERO_BLOCKS];
-}
-
-bool migrate_use_compression(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->enabled_capabilities[MIGRATION_CAPABILITY_COMPRESS];
-}
-
-int migrate_compress_level(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL];
-}
-
-int migrate_compress_threads(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS];
-}
-
-int migrate_decompress_threads(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS];
-}
-
-bool migrate_use_events(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->enabled_capabilities[MIGRATION_CAPABILITY_EVENTS];
-}
-
-int migrate_use_xbzrle(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
-}
-
-int64_t migrate_xbzrle_cache_size(void)
-{
-    MigrationState *s;
-
-    s = migrate_get_current();
-
-    return s->xbzrle_cache_size;
-}
-
-/* migration thread support */
-/*
- * Something bad happened to the RP stream, mark an error
- * The caller shall print or trace something to indicate why
- */
-static void mark_source_rp_bad(MigrationState *s)
-{
-    s->rp_state.error = true;
-}
-
-static struct rp_cmd_args {
-    ssize_t     len; /* -1 = variable */
-    const char *name;
-} rp_cmd_args[] = {
-    [MIG_RP_MSG_INVALID]        = { .len = -1, .name = "INVALID" },
-    [MIG_RP_MSG_SHUT]           = { .len =  4, .name = "SHUT" },
-    [MIG_RP_MSG_PONG]           = { .len =  4, .name = "PONG" },
-    [MIG_RP_MSG_REQ_PAGES]      = { .len = 12, .name = "REQ_PAGES" },
-    [MIG_RP_MSG_REQ_PAGES_ID]   = { .len = -1, .name = "REQ_PAGES_ID" },
-    [MIG_RP_MSG_MAX]            = { .len = -1, .name = "MAX" },
-};
-
-/*
- * Process a request for pages received on the return path,
- * We're allowed to send more than requested (e.g. to round to our page size)
- * and we don't need to send pages that have already been sent.
- */
-static void migrate_handle_rp_req_pages(MigrationState *ms, const char* rbname,
-                                       ram_addr_t start, size_t len)
-{
-    long our_host_ps = getpagesize();
-
-    trace_migrate_handle_rp_req_pages(rbname, start, len);
-
-    /*
-     * Since we currently insist on matching page sizes, just sanity check
-     * we're being asked for whole host pages.
-     */
-    if (start & (our_host_ps-1) ||
-       (len & (our_host_ps-1))) {
-        error_report("%s: Misaligned page request, start: " RAM_ADDR_FMT
-                     " len: %zd", __func__, start, len);
-        mark_source_rp_bad(ms);
-        return;
-    }
-
-    if (ram_save_queue_pages(ms, rbname, start, len)) {
-        mark_source_rp_bad(ms);
-    }
-}
-
-/*
- * Handles messages sent on the return path towards the source VM
- *
- */
-static void *source_return_path_thread(void *opaque)
-{
-    MigrationState *ms = opaque;
-    QEMUFile *rp = ms->rp_state.from_dst_file;
-    uint16_t header_len, header_type;
-    uint8_t buf[512];
-    uint32_t tmp32, sibling_error;
-    ram_addr_t start = 0; /* =0 to silence warning */
-    size_t  len = 0, expected_len;
-    int res;
-
-    trace_source_return_path_thread_entry();
-    while (!ms->rp_state.error && !qemu_file_get_error(rp) &&
-           migration_is_setup_or_active(ms->state)) {
-        trace_source_return_path_thread_loop_top();
-        header_type = qemu_get_be16(rp);
-        header_len = qemu_get_be16(rp);
-
-        if (header_type >= MIG_RP_MSG_MAX ||
-            header_type == MIG_RP_MSG_INVALID) {
-            error_report("RP: Received invalid message 0x%04x length 0x%04x",
-                    header_type, header_len);
-            mark_source_rp_bad(ms);
-            goto out;
-        }
-
-        if ((rp_cmd_args[header_type].len != -1 &&
-            header_len != rp_cmd_args[header_type].len) ||
-            header_len > sizeof(buf)) {
-            error_report("RP: Received '%s' message (0x%04x) with"
-                    "incorrect length %d expecting %zu",
-                    rp_cmd_args[header_type].name, header_type, header_len,
-                    (size_t)rp_cmd_args[header_type].len);
-            mark_source_rp_bad(ms);
-            goto out;
-        }
-
-        /* We know we've got a valid header by this point */
-        res = qemu_get_buffer(rp, buf, header_len);
-        if (res != header_len) {
-            error_report("RP: Failed reading data for message 0x%04x"
-                         " read %d expected %d",
-                         header_type, res, header_len);
-            mark_source_rp_bad(ms);
-            goto out;
-        }
-
-        /* OK, we have the message and the data */
-        switch (header_type) {
-        case MIG_RP_MSG_SHUT:
-            sibling_error = be32_to_cpup((uint32_t *)buf);
-            trace_source_return_path_thread_shut(sibling_error);
-            if (sibling_error) {
-                error_report("RP: Sibling indicated error %d", sibling_error);
-                mark_source_rp_bad(ms);
-            }
-            /*
-             * We'll let the main thread deal with closing the RP
-             * we could do a shutdown(2) on it, but we're the only user
-             * anyway, so there's nothing gained.
-             */
-            goto out;
-
-        case MIG_RP_MSG_PONG:
-            tmp32 = be32_to_cpup((uint32_t *)buf);
-            trace_source_return_path_thread_pong(tmp32);
-            break;
-
-        case MIG_RP_MSG_REQ_PAGES:
-            start = be64_to_cpup((uint64_t *)buf);
-            len = be32_to_cpup((uint32_t *)(buf + 8));
-            migrate_handle_rp_req_pages(ms, NULL, start, len);
-            break;
-
-        case MIG_RP_MSG_REQ_PAGES_ID:
-            expected_len = 12 + 1; /* header + termination */
-
-            if (header_len >= expected_len) {
-                start = be64_to_cpup((uint64_t *)buf);
-                len = be32_to_cpup((uint32_t *)(buf + 8));
-                /* Now we expect an idstr */
-                tmp32 = buf[12]; /* Length of the following idstr */
-                buf[13 + tmp32] = '\0';
-                expected_len += tmp32;
-            }
-            if (header_len != expected_len) {
-                error_report("RP: Req_Page_id with length %d expecting %zd",
-                        header_len, expected_len);
-                mark_source_rp_bad(ms);
-                goto out;
-            }
-            migrate_handle_rp_req_pages(ms, (char *)&buf[13], start, len);
-            break;
-
-        default:
-            break;
-        }
-    }
-    if (qemu_file_get_error(rp)) {
-        trace_source_return_path_thread_bad_end();
-        mark_source_rp_bad(ms);
-    }
-
-    trace_source_return_path_thread_end();
-out:
-    ms->rp_state.from_dst_file = NULL;
-    qemu_fclose(rp);
-    return NULL;
-}
-
-static int open_return_path_on_source(MigrationState *ms)
-{
-
-    ms->rp_state.from_dst_file = qemu_file_get_return_path(ms->to_dst_file);
-    if (!ms->rp_state.from_dst_file) {
-        return -1;
-    }
-
-    trace_open_return_path_on_source();
-    qemu_thread_create(&ms->rp_state.rp_thread, "return path",
-                       source_return_path_thread, ms, QEMU_THREAD_JOINABLE);
-
-    trace_open_return_path_on_source_continue();
-
-    return 0;
-}
-
-/* Returns 0 if the RP was ok, otherwise there was an error on the RP */
-static int await_return_path_close_on_source(MigrationState *ms)
-{
-    /*
-     * If this is a normal exit then the destination will send a SHUT and the
-     * rp_thread will exit, however if there's an error we need to cause
-     * it to exit.
-     */
-    if (qemu_file_get_error(ms->to_dst_file) && ms->rp_state.from_dst_file) {
-        /*
-         * shutdown(2), if we have it, will cause it to unblock if it's stuck
-         * waiting for the destination.
-         */
-        qemu_file_shutdown(ms->rp_state.from_dst_file);
-        mark_source_rp_bad(ms);
-    }
-    trace_await_return_path_close_on_source_joining();
-    qemu_thread_join(&ms->rp_state.rp_thread);
-    trace_await_return_path_close_on_source_close();
-    return ms->rp_state.error;
-}
-
-/*
- * Switch from normal iteration to postcopy
- * Returns non-0 on error
- */
-static int postcopy_start(MigrationState *ms, bool *old_vm_running)
-{
-    int ret;
-    const QEMUSizedBuffer *qsb;
-    int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-    migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
-                      MIGRATION_STATUS_POSTCOPY_ACTIVE);
-
-    trace_postcopy_start();
-    qemu_mutex_lock_iothread();
-    trace_postcopy_start_set_run();
-
-    qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
-    *old_vm_running = runstate_is_running();
-    global_state_store();
-    ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
-    if (ret < 0) {
-        goto fail;
-    }
-
-    ret = bdrv_inactivate_all();
-    if (ret < 0) {
-        goto fail;
-    }
-
-    /*
-     * Cause any non-postcopiable, but iterative devices to
-     * send out their final data.
-     */
-    qemu_savevm_state_complete_precopy(ms->to_dst_file, true);
-
-    /*
-     * in Finish migrate and with the io-lock held everything should
-     * be quiet, but we've potentially still got dirty pages and we
-     * need to tell the destination to throw any pages it's already received
-     * that are dirty
-     */
-    if (ram_postcopy_send_discard_bitmap(ms)) {
-        error_report("postcopy send discard bitmap failed");
-        goto fail;
-    }
-
-    /*
-     * send rest of state - note things that are doing postcopy
-     * will notice we're in POSTCOPY_ACTIVE and not actually
-     * wrap their state up here
-     */
-    qemu_file_set_rate_limit(ms->to_dst_file, INT64_MAX);
-    /* Ping just for debugging, helps line traces up */
-    qemu_savevm_send_ping(ms->to_dst_file, 2);
-
-    /*
-     * While loading the device state we may trigger page transfer
-     * requests and the fd must be free to process those, and thus
-     * the destination must read the whole device state off the fd before
-     * it starts processing it.  Unfortunately the ad-hoc migration format
-     * doesn't allow the destination to know the size to read without fully
-     * parsing it through each devices load-state code (especially the open
-     * coded devices that use get/put).
-     * So we wrap the device state up in a package with a length at the start;
-     * to do this we use a qemu_buf to hold the whole of the device state.
-     */
-    QEMUFile *fb = qemu_bufopen("w", NULL);
-    if (!fb) {
-        error_report("Failed to create buffered file");
-        goto fail;
-    }
-
-    /*
-     * Make sure the receiver can get incoming pages before we send the rest
-     * of the state
-     */
-    qemu_savevm_send_postcopy_listen(fb);
-
-    qemu_savevm_state_complete_precopy(fb, false);
-    qemu_savevm_send_ping(fb, 3);
-
-    qemu_savevm_send_postcopy_run(fb);
-
-    /* <><> end of stuff going into the package */
-    qsb = qemu_buf_get(fb);
-
-    /* Now send that blob */
-    if (qemu_savevm_send_packaged(ms->to_dst_file, qsb)) {
-        goto fail_closefb;
-    }
-    qemu_fclose(fb);
-
-    /* Send a notify to give a chance for anything that needs to happen
-     * at the transition to postcopy and after the device state; in particular
-     * spice needs to trigger a transition now
-     */
-    ms->postcopy_after_devices = true;
-    notifier_list_notify(&migration_state_notifiers, ms);
-
-    ms->downtime =  qemu_clock_get_ms(QEMU_CLOCK_REALTIME) - time_at_stop;
-
-    qemu_mutex_unlock_iothread();
-
-    /*
-     * Although this ping is just for debug, it could potentially be
-     * used for getting a better measurement of downtime at the source.
-     */
-    qemu_savevm_send_ping(ms->to_dst_file, 4);
-
-    ret = qemu_file_get_error(ms->to_dst_file);
-    if (ret) {
-        error_report("postcopy_start: Migration stream errored");
-        migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
-                              MIGRATION_STATUS_FAILED);
-    }
-
-    return ret;
-
-fail_closefb:
-    qemu_fclose(fb);
-fail:
-    migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
-                          MIGRATION_STATUS_FAILED);
-    qemu_mutex_unlock_iothread();
-    return -1;
-}
-
-/**
- * migration_completion: Used by migration_thread when there's not much left.
- *   The caller 'breaks' the loop when this returns.
- *
- * @s: Current migration state
- * @current_active_state: The migration state we expect to be in
- * @*old_vm_running: Pointer to old_vm_running flag
- * @*start_time: Pointer to time to update
- */
-static void migration_completion(MigrationState *s, int current_active_state,
-                                 bool *old_vm_running,
-                                 int64_t *start_time)
-{
-    int ret;
-
-    if (s->state == MIGRATION_STATUS_ACTIVE) {
-        qemu_mutex_lock_iothread();
-        *start_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-        qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
-        *old_vm_running = runstate_is_running();
-        ret = global_state_store();
-
-        if (!ret) {
-            ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
-            if (ret >= 0) {
-                ret = bdrv_inactivate_all();
-            }
-            if (ret >= 0) {
-                qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
-                qemu_savevm_state_complete_precopy(s->to_dst_file, false);
-            }
-        }
-        qemu_mutex_unlock_iothread();
-
-        if (ret < 0) {
-            goto fail;
-        }
-    } else if (s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
-        trace_migration_completion_postcopy_end();
-
-        qemu_savevm_state_complete_postcopy(s->to_dst_file);
-        trace_migration_completion_postcopy_end_after_complete();
-    }
-
-    /*
-     * If rp was opened we must clean up the thread before
-     * cleaning everything else up (since if there are no failures
-     * it will wait for the destination to send it's status in
-     * a SHUT command).
-     * Postcopy opens rp if enabled (even if it's not avtivated)
-     */
-    if (migrate_postcopy_ram()) {
-        int rp_error;
-        trace_migration_completion_postcopy_end_before_rp();
-        rp_error = await_return_path_close_on_source(s);
-        trace_migration_completion_postcopy_end_after_rp(rp_error);
-        if (rp_error) {
-            goto fail;
-        }
-    }
-
-    if (qemu_file_get_error(s->to_dst_file)) {
-        trace_migration_completion_file_err();
-        goto fail;
-    }
-
-    migrate_set_state(&s->state, current_active_state,
-                      MIGRATION_STATUS_COMPLETED);
-    return;
-
-fail:
-    migrate_set_state(&s->state, current_active_state,
-                      MIGRATION_STATUS_FAILED);
-}
-
-/*
- * Master migration thread on the source VM.
- * It drives the migration and pumps the data down the outgoing channel.
- */
-static void *migration_thread(void *opaque)
-{
-    MigrationState *s = opaque;
-    /* Used by the bandwidth calcs, updated later */
-    int64_t initial_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-    int64_t setup_start = qemu_clock_get_ms(QEMU_CLOCK_HOST);
-    int64_t initial_bytes = 0;
-    int64_t max_size = 0;
-    int64_t start_time = initial_time;
-    int64_t end_time;
-    bool old_vm_running = false;
-    bool entered_postcopy = false;
-    /* The active state we expect to be in; ACTIVE or POSTCOPY_ACTIVE */
-    enum MigrationStatus current_active_state = MIGRATION_STATUS_ACTIVE;
-
-    rcu_register_thread();
-
-    qemu_savevm_state_header(s->to_dst_file);
-
-    if (migrate_postcopy_ram()) {
-        /* Now tell the dest that it should open its end so it can reply */
-        qemu_savevm_send_open_return_path(s->to_dst_file);
-
-        /* And do a ping that will make stuff easier to debug */
-        qemu_savevm_send_ping(s->to_dst_file, 1);
-
-        /*
-         * Tell the destination that we *might* want to do postcopy later;
-         * if the other end can't do postcopy it should fail now, nice and
-         * early.
-         */
-        qemu_savevm_send_postcopy_advise(s->to_dst_file);
-    }
-
-    qemu_savevm_state_begin(s->to_dst_file, &s->params);
-
-    s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start;
-    current_active_state = MIGRATION_STATUS_ACTIVE;
-    migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
-                      MIGRATION_STATUS_ACTIVE);
-
-    trace_migration_thread_setup_complete();
-
-    while (s->state == MIGRATION_STATUS_ACTIVE ||
-           s->state == MIGRATION_STATUS_POSTCOPY_ACTIVE) {
-        int64_t current_time;
-        uint64_t pending_size;
-
-        if (!qemu_file_rate_limit(s->to_dst_file)) {
-            uint64_t pend_post, pend_nonpost;
-
-            qemu_savevm_state_pending(s->to_dst_file, max_size, &pend_nonpost,
-                                      &pend_post);
-            pending_size = pend_nonpost + pend_post;
-            trace_migrate_pending(pending_size, max_size,
-                                  pend_post, pend_nonpost);
-            if (pending_size && pending_size >= max_size) {
-                /* Still a significant amount to transfer */
-
-                if (migrate_postcopy_ram() &&
-                    s->state != MIGRATION_STATUS_POSTCOPY_ACTIVE &&
-                    pend_nonpost <= max_size &&
-                    atomic_read(&s->start_postcopy)) {
-
-                    if (!postcopy_start(s, &old_vm_running)) {
-                        current_active_state = MIGRATION_STATUS_POSTCOPY_ACTIVE;
-                        entered_postcopy = true;
-                    }
-
-                    continue;
-                }
-                /* Just another iteration step */
-                qemu_savevm_state_iterate(s->to_dst_file, entered_postcopy);
-            } else {
-                trace_migration_thread_low_pending(pending_size);
-                migration_completion(s, current_active_state,
-                                     &old_vm_running, &start_time);
-                break;
-            }
-        }
-
-        if (qemu_file_get_error(s->to_dst_file)) {
-            migrate_set_state(&s->state, current_active_state,
-                              MIGRATION_STATUS_FAILED);
-            trace_migration_thread_file_err();
-            break;
-        }
-        current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-        if (current_time >= initial_time + BUFFER_DELAY) {
-            uint64_t transferred_bytes = qemu_ftell(s->to_dst_file) -
-                                         initial_bytes;
-            uint64_t time_spent = current_time - initial_time;
-            double bandwidth = (double)transferred_bytes / time_spent;
-            max_size = bandwidth * migrate_max_downtime() / 1000000;
-
-            s->mbps = (((double) transferred_bytes * 8.0) /
-                    ((double) time_spent / 1000.0)) / 1000.0 / 1000.0;
-
-            trace_migrate_transferred(transferred_bytes, time_spent,
-                                      bandwidth, max_size);
-            /* if we haven't sent anything, we don't want to recalculate
-               10000 is a small enough number for our purposes */
-            if (s->dirty_bytes_rate && transferred_bytes > 10000) {
-                s->expected_downtime = s->dirty_bytes_rate / bandwidth;
-            }
-
-            qemu_file_reset_rate_limit(s->to_dst_file);
-            initial_time = current_time;
-            initial_bytes = qemu_ftell(s->to_dst_file);
-        }
-        if (qemu_file_rate_limit(s->to_dst_file)) {
-            /* usleep expects microseconds */
-            g_usleep((initial_time + BUFFER_DELAY - current_time)*1000);
-        }
-    }
-
-    trace_migration_thread_after_loop();
-    /* If we enabled cpu throttling for auto-converge, turn it off. */
-    cpu_throttle_stop();
-    end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
-
-    qemu_mutex_lock_iothread();
-    qemu_savevm_state_cleanup();
-    if (s->state == MIGRATION_STATUS_COMPLETED) {
-        uint64_t transferred_bytes = qemu_ftell(s->to_dst_file);
-        s->total_time = end_time - s->total_time;
-        if (!entered_postcopy) {
-            s->downtime = end_time - start_time;
-        }
-        if (s->total_time) {
-            s->mbps = (((double) transferred_bytes * 8.0) /
-                       ((double) s->total_time)) / 1000;
-        }
-        runstate_set(RUN_STATE_POSTMIGRATE);
-    } else {
-        if (old_vm_running && !entered_postcopy) {
-            vm_start();
-        }
-    }
-    qemu_bh_schedule(s->cleanup_bh);
-    qemu_mutex_unlock_iothread();
-
-    rcu_unregister_thread();
-    return NULL;
-}
-
-void migrate_fd_connect(MigrationState *s)
-{
-    /* This is a best 1st approximation. ns to ms */
-    s->expected_downtime = max_downtime/1000000;
-    s->cleanup_bh = qemu_bh_new(migrate_fd_cleanup, s);
-
-    qemu_file_set_rate_limit(s->to_dst_file,
-                             s->bandwidth_limit / XFER_LIMIT_RATIO);
-
-    /* Notify before starting migration thread */
-    notifier_list_notify(&migration_state_notifiers, s);
-
-    /*
-     * Open the return path; currently for postcopy but other things might
-     * also want it.
-     */
-    if (migrate_postcopy_ram()) {
-        if (open_return_path_on_source(s)) {
-            error_report("Unable to open return-path for postcopy");
-            migrate_set_state(&s->state, MIGRATION_STATUS_SETUP,
-                              MIGRATION_STATUS_FAILED);
-            migrate_fd_cleanup(s);
-            return;
-        }
-    }
-
-    migrate_compress_threads_create();
-    qemu_thread_create(&s->thread, "migration", migration_thread, s,
-                       QEMU_THREAD_JOINABLE);
-    s->migration_thread_running = true;
-}
-
-PostcopyState  postcopy_state_get(void)
-{
-    return atomic_mb_read(&incoming_postcopy_state);
-}
-
-/* Set the state and return the old state */
-PostcopyState postcopy_state_set(PostcopyState new_state)
-{
-    return atomic_xchg(&incoming_postcopy_state, new_state);
-}
-