| /* |
| * 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-common.h" |
| #include "migration/migration.h" |
| #include "monitor/monitor.h" |
| #include "migration/qemu-file.h" |
| #include "sysemu/sysemu.h" |
| #include "block/block.h" |
| #include "qemu/sockets.h" |
| #include "migration/block.h" |
| #include "qemu/thread.h" |
| #include "qmp-commands.h" |
| |
| //#define DEBUG_MIGRATION |
| |
| #ifdef DEBUG_MIGRATION |
| #define DPRINTF(fmt, ...) \ |
| do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) |
| #else |
| #define DPRINTF(fmt, ...) \ |
| do { } while (0) |
| #endif |
| |
| enum { |
| MIG_STATE_ERROR, |
| MIG_STATE_SETUP, |
| MIG_STATE_CANCELLED, |
| MIG_STATE_ACTIVE, |
| MIG_STATE_COMPLETED, |
| }; |
| |
| #define MAX_THROTTLE (32 << 20) /* Migration 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) |
| |
| /* Migration XBZRLE default cache size */ |
| #define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) |
| |
| static NotifierList migration_state_notifiers = |
| NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); |
| |
| /* When we add fault tolerance, we could have several |
| migrations at once. For now we don't need to add |
| dynamic creation of migration */ |
| |
| MigrationState *migrate_get_current(void) |
| { |
| static MigrationState current_migration = { |
| .state = MIG_STATE_SETUP, |
| .bandwidth_limit = MAX_THROTTLE, |
| .xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, |
| }; |
| |
| return ¤t_migration; |
| } |
| |
| void qemu_start_incoming_migration(const char *uri, Error **errp) |
| { |
| const char *p; |
| |
| if (strstart(uri, "tcp:", &p)) |
| tcp_start_incoming_migration(p, errp); |
| #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_co(void *opaque) |
| { |
| QEMUFile *f = opaque; |
| int ret; |
| |
| ret = qemu_loadvm_state(f); |
| qemu_fclose(f); |
| if (ret < 0) { |
| fprintf(stderr, "load of migration failed\n"); |
| exit(0); |
| } |
| qemu_announce_self(); |
| DPRINTF("successfully loaded vm state\n"); |
| |
| bdrv_clear_incoming_migration_all(); |
| /* Make sure all file formats flush their mutable metadata */ |
| bdrv_invalidate_cache_all(); |
| |
| if (autostart) { |
| vm_start(); |
| } else { |
| runstate_set(RUN_STATE_PAUSED); |
| } |
| } |
| |
| void process_incoming_migration(QEMUFile *f) |
| { |
| Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); |
| int fd = qemu_get_fd(f); |
| |
| assert(fd != -1); |
| qemu_set_nonblock(fd); |
| qemu_coroutine_enter(co, f); |
| } |
| |
| /* 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 = 30000000; |
| |
| 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; |
| |
| 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; |
| } |
| |
| 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->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 MIG_STATE_SETUP: |
| /* no migration has happened ever */ |
| break; |
| case MIG_STATE_ACTIVE: |
| info->has_status = true; |
| info->status = g_strdup("active"); |
| info->has_total_time = true; |
| info->total_time = qemu_get_clock_ms(rt_clock) |
| - s->total_time; |
| info->has_expected_downtime = true; |
| info->expected_downtime = s->expected_downtime; |
| |
| 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->normal = norm_mig_pages_transferred(); |
| info->ram->normal_bytes = norm_mig_bytes_transferred(); |
| info->ram->dirty_pages_rate = s->dirty_pages_rate; |
| |
| |
| 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 MIG_STATE_COMPLETED: |
| get_xbzrle_cache_stats(info); |
| |
| info->has_status = true; |
| info->status = g_strdup("completed"); |
| info->total_time = s->total_time; |
| info->has_downtime = true; |
| info->downtime = s->downtime; |
| |
| 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->normal = norm_mig_pages_transferred(); |
| info->ram->normal_bytes = norm_mig_bytes_transferred(); |
| break; |
| case MIG_STATE_ERROR: |
| info->has_status = true; |
| info->status = g_strdup("failed"); |
| break; |
| case MIG_STATE_CANCELLED: |
| info->has_status = true; |
| info->status = g_strdup("cancelled"); |
| break; |
| } |
| |
| return info; |
| } |
| |
| void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params, |
| Error **errp) |
| { |
| MigrationState *s = migrate_get_current(); |
| MigrationCapabilityStatusList *cap; |
| |
| if (s->state == MIG_STATE_ACTIVE) { |
| error_set(errp, QERR_MIGRATION_ACTIVE); |
| return; |
| } |
| |
| for (cap = params; cap; cap = cap->next) { |
| s->enabled_capabilities[cap->value->capability] = cap->value->state; |
| } |
| } |
| |
| /* shared migration helpers */ |
| |
| static int migrate_fd_cleanup(MigrationState *s) |
| { |
| int ret = 0; |
| |
| if (s->file) { |
| DPRINTF("closing file\n"); |
| ret = qemu_fclose(s->file); |
| s->file = NULL; |
| } |
| |
| assert(s->fd == -1); |
| return ret; |
| } |
| |
| void migrate_fd_error(MigrationState *s) |
| { |
| DPRINTF("setting error state\n"); |
| s->state = MIG_STATE_ERROR; |
| notifier_list_notify(&migration_state_notifiers, s); |
| migrate_fd_cleanup(s); |
| } |
| |
| static void migrate_fd_completed(MigrationState *s) |
| { |
| DPRINTF("setting completed state\n"); |
| if (migrate_fd_cleanup(s) < 0) { |
| s->state = MIG_STATE_ERROR; |
| } else { |
| s->state = MIG_STATE_COMPLETED; |
| runstate_set(RUN_STATE_POSTMIGRATE); |
| } |
| notifier_list_notify(&migration_state_notifiers, s); |
| } |
| |
| static ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data, |
| size_t size) |
| { |
| ssize_t ret; |
| |
| if (s->state != MIG_STATE_ACTIVE) { |
| return -EIO; |
| } |
| |
| do { |
| ret = s->write(s, data, size); |
| } while (ret == -1 && ((s->get_error(s)) == EINTR)); |
| |
| if (ret == -1) |
| ret = -(s->get_error(s)); |
| |
| return ret; |
| } |
| |
| static void migrate_fd_cancel(MigrationState *s) |
| { |
| if (s->state != MIG_STATE_ACTIVE) |
| return; |
| |
| DPRINTF("cancelling migration\n"); |
| |
| s->state = MIG_STATE_CANCELLED; |
| notifier_list_notify(&migration_state_notifiers, s); |
| qemu_savevm_state_cancel(); |
| |
| migrate_fd_cleanup(s); |
| } |
| |
| int migrate_fd_close(MigrationState *s) |
| { |
| int rc = 0; |
| if (s->fd != -1) { |
| rc = s->close(s); |
| s->fd = -1; |
| } |
| return rc; |
| } |
| |
| 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_is_active(MigrationState *s) |
| { |
| return s->state == MIG_STATE_ACTIVE; |
| } |
| |
| bool migration_has_finished(MigrationState *s) |
| { |
| return s->state == MIG_STATE_COMPLETED; |
| } |
| |
| bool migration_has_failed(MigrationState *s) |
| { |
| return (s->state == MIG_STATE_CANCELLED || |
| s->state == MIG_STATE_ERROR); |
| } |
| |
| static MigrationState *migrate_init(const MigrationParams *params) |
| { |
| MigrationState *s = migrate_get_current(); |
| int64_t bandwidth_limit = s->bandwidth_limit; |
| bool enabled_capabilities[MIGRATION_CAPABILITY_MAX]; |
| int64_t xbzrle_cache_size = s->xbzrle_cache_size; |
| |
| memcpy(enabled_capabilities, s->enabled_capabilities, |
| sizeof(enabled_capabilities)); |
| |
| memset(s, 0, sizeof(*s)); |
| s->bandwidth_limit = bandwidth_limit; |
| s->params = *params; |
| memcpy(s->enabled_capabilities, enabled_capabilities, |
| sizeof(enabled_capabilities)); |
| s->xbzrle_cache_size = xbzrle_cache_size; |
| |
| s->bandwidth_limit = bandwidth_limit; |
| s->state = MIG_STATE_SETUP; |
| s->total_time = qemu_get_clock_ms(rt_clock); |
| |
| 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(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 = blk; |
| params.shared = inc; |
| |
| if (s->state == MIG_STATE_ACTIVE) { |
| error_set(errp, QERR_MIGRATION_ACTIVE); |
| return; |
| } |
| |
| if (qemu_savevm_state_blocked(errp)) { |
| return; |
| } |
| |
| if (migration_blockers) { |
| *errp = error_copy(migration_blockers->data); |
| return; |
| } |
| |
| s = migrate_init(¶ms); |
| |
| if (strstart(uri, "tcp:", &p)) { |
| tcp_start_outgoing_migration(s, p, &local_err); |
| #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_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol"); |
| 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(); |
| |
| /* Check for truncation */ |
| if (value != (size_t)value) { |
| error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size", |
| "exceeding address space"); |
| return; |
| } |
| |
| s->xbzrle_cache_size = xbzrle_cache_resize(value); |
| } |
| |
| 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; |
| } |
| |
| s = migrate_get_current(); |
| s->bandwidth_limit = value; |
| qemu_file_set_rate_limit(s->file, s->bandwidth_limit); |
| } |
| |
| void qmp_migrate_set_downtime(double value, Error **errp) |
| { |
| value *= 1e9; |
| value = MAX(0, MIN(UINT64_MAX, value)); |
| max_downtime = (uint64_t)value; |
| } |
| |
| 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 */ |
| |
| |
| static ssize_t buffered_flush(MigrationState *s) |
| { |
| size_t offset = 0; |
| ssize_t ret = 0; |
| |
| DPRINTF("flushing %zu byte(s) of data\n", s->buffer_size); |
| |
| while (s->bytes_xfer < s->xfer_limit && offset < s->buffer_size) { |
| size_t to_send = MIN(s->buffer_size - offset, s->xfer_limit - s->bytes_xfer); |
| ret = migrate_fd_put_buffer(s, s->buffer + offset, to_send); |
| if (ret <= 0) { |
| DPRINTF("error flushing data, %zd\n", ret); |
| break; |
| } else { |
| DPRINTF("flushed %zd byte(s)\n", ret); |
| offset += ret; |
| s->bytes_xfer += ret; |
| } |
| } |
| |
| DPRINTF("flushed %zu of %zu byte(s)\n", offset, s->buffer_size); |
| memmove(s->buffer, s->buffer + offset, s->buffer_size - offset); |
| s->buffer_size -= offset; |
| |
| if (ret < 0) { |
| return ret; |
| } |
| return offset; |
| } |
| |
| static int buffered_put_buffer(void *opaque, const uint8_t *buf, |
| int64_t pos, int size) |
| { |
| MigrationState *s = opaque; |
| ssize_t error; |
| |
| DPRINTF("putting %d bytes at %" PRId64 "\n", size, pos); |
| |
| error = qemu_file_get_error(s->file); |
| if (error) { |
| DPRINTF("flush when error, bailing: %s\n", strerror(-error)); |
| return error; |
| } |
| |
| if (size <= 0) { |
| return size; |
| } |
| |
| if (size > (s->buffer_capacity - s->buffer_size)) { |
| DPRINTF("increasing buffer capacity from %zu by %zu\n", |
| s->buffer_capacity, size + 1024); |
| |
| s->buffer_capacity += size + 1024; |
| |
| s->buffer = g_realloc(s->buffer, s->buffer_capacity); |
| } |
| |
| memcpy(s->buffer + s->buffer_size, buf, size); |
| s->buffer_size += size; |
| |
| return size; |
| } |
| |
| static int buffered_close(void *opaque) |
| { |
| MigrationState *s = opaque; |
| ssize_t ret = 0; |
| int ret2; |
| |
| DPRINTF("closing\n"); |
| |
| s->xfer_limit = INT_MAX; |
| while (!qemu_file_get_error(s->file) && s->buffer_size) { |
| ret = buffered_flush(s); |
| if (ret < 0) { |
| break; |
| } |
| } |
| |
| ret2 = migrate_fd_close(s); |
| if (ret >= 0) { |
| ret = ret2; |
| } |
| s->complete = true; |
| return ret; |
| } |
| |
| static int buffered_get_fd(void *opaque) |
| { |
| MigrationState *s = opaque; |
| |
| return s->fd; |
| } |
| |
| /* |
| * The meaning of the return values is: |
| * 0: We can continue sending |
| * 1: Time to stop |
| * negative: There has been an error |
| */ |
| static int buffered_rate_limit(void *opaque) |
| { |
| MigrationState *s = opaque; |
| int ret; |
| |
| ret = qemu_file_get_error(s->file); |
| if (ret) { |
| return ret; |
| } |
| |
| if (s->bytes_xfer >= s->xfer_limit) { |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int64_t buffered_set_rate_limit(void *opaque, int64_t new_rate) |
| { |
| MigrationState *s = opaque; |
| if (qemu_file_get_error(s->file)) { |
| goto out; |
| } |
| if (new_rate > SIZE_MAX) { |
| new_rate = SIZE_MAX; |
| } |
| |
| s->xfer_limit = new_rate / XFER_LIMIT_RATIO; |
| |
| out: |
| return s->xfer_limit; |
| } |
| |
| static int64_t buffered_get_rate_limit(void *opaque) |
| { |
| MigrationState *s = opaque; |
| |
| return s->xfer_limit; |
| } |
| |
| static void *buffered_file_thread(void *opaque) |
| { |
| MigrationState *s = opaque; |
| int64_t initial_time = qemu_get_clock_ms(rt_clock); |
| int64_t max_size = 0; |
| bool last_round = false; |
| int ret; |
| |
| qemu_mutex_lock_iothread(); |
| DPRINTF("beginning savevm\n"); |
| ret = qemu_savevm_state_begin(s->file, &s->params); |
| if (ret < 0) { |
| DPRINTF("failed, %d\n", ret); |
| qemu_mutex_unlock_iothread(); |
| goto out; |
| } |
| qemu_mutex_unlock_iothread(); |
| |
| while (true) { |
| int64_t current_time = qemu_get_clock_ms(rt_clock); |
| uint64_t pending_size; |
| |
| qemu_mutex_lock_iothread(); |
| if (s->state != MIG_STATE_ACTIVE) { |
| DPRINTF("put_ready returning because of non-active state\n"); |
| qemu_mutex_unlock_iothread(); |
| break; |
| } |
| if (s->complete) { |
| qemu_mutex_unlock_iothread(); |
| break; |
| } |
| if (s->bytes_xfer < s->xfer_limit) { |
| DPRINTF("iterate\n"); |
| pending_size = qemu_savevm_state_pending(s->file, max_size); |
| DPRINTF("pending size %lu max %lu\n", pending_size, max_size); |
| if (pending_size && pending_size >= max_size) { |
| ret = qemu_savevm_state_iterate(s->file); |
| if (ret < 0) { |
| qemu_mutex_unlock_iothread(); |
| break; |
| } |
| } else { |
| int old_vm_running = runstate_is_running(); |
| int64_t start_time, end_time; |
| |
| DPRINTF("done iterating\n"); |
| start_time = qemu_get_clock_ms(rt_clock); |
| qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); |
| if (old_vm_running) { |
| vm_stop(RUN_STATE_FINISH_MIGRATE); |
| } else { |
| vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); |
| } |
| ret = qemu_savevm_state_complete(s->file); |
| if (ret < 0) { |
| qemu_mutex_unlock_iothread(); |
| break; |
| } else { |
| migrate_fd_completed(s); |
| } |
| end_time = qemu_get_clock_ms(rt_clock); |
| s->total_time = end_time - s->total_time; |
| s->downtime = end_time - start_time; |
| if (s->state != MIG_STATE_COMPLETED) { |
| if (old_vm_running) { |
| vm_start(); |
| } |
| } |
| last_round = true; |
| } |
| } |
| qemu_mutex_unlock_iothread(); |
| if (current_time >= initial_time + BUFFER_DELAY) { |
| uint64_t transferred_bytes = s->bytes_xfer; |
| uint64_t time_spent = current_time - initial_time; |
| double bandwidth = transferred_bytes / time_spent; |
| max_size = bandwidth * migrate_max_downtime() / 1000000; |
| |
| DPRINTF("transferred %" PRIu64 " time_spent %" PRIu64 |
| " bandwidth %g max_size %" PRId64 "\n", |
| transferred_bytes, time_spent, bandwidth, max_size); |
| |
| s->bytes_xfer = 0; |
| initial_time = current_time; |
| } |
| if (!last_round && (s->bytes_xfer >= s->xfer_limit)) { |
| /* usleep expects microseconds */ |
| g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); |
| } |
| ret = buffered_flush(s); |
| if (ret < 0) { |
| break; |
| } |
| } |
| |
| out: |
| if (ret < 0) { |
| migrate_fd_error(s); |
| } |
| g_free(s->buffer); |
| return NULL; |
| } |
| |
| static const QEMUFileOps buffered_file_ops = { |
| .get_fd = buffered_get_fd, |
| .put_buffer = buffered_put_buffer, |
| .close = buffered_close, |
| .rate_limit = buffered_rate_limit, |
| .get_rate_limit = buffered_get_rate_limit, |
| .set_rate_limit = buffered_set_rate_limit, |
| }; |
| |
| void migrate_fd_connect(MigrationState *s) |
| { |
| s->state = MIG_STATE_ACTIVE; |
| s->bytes_xfer = 0; |
| s->buffer = NULL; |
| s->buffer_size = 0; |
| s->buffer_capacity = 0; |
| |
| s->xfer_limit = s->bandwidth_limit / XFER_LIMIT_RATIO; |
| s->complete = false; |
| |
| s->file = qemu_fopen_ops(s, &buffered_file_ops); |
| |
| qemu_thread_create(&s->thread, buffered_file_thread, s, |
| QEMU_THREAD_DETACHED); |
| notifier_list_notify(&migration_state_notifiers, s); |
| } |
