| /* |
| * 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 "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 "qemu/sockets.h" |
| #include "qemu/rcu.h" |
| #include "migration/block.h" |
| #include "qemu/thread.h" |
| #include "qmp-commands.h" |
| #include "trace.h" |
| #include "qapi/util.h" |
| #include "qapi-event.h" |
| #include "qom/cpu.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; |
| |
| /* 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 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, |
| }; |
| |
| return ¤t_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->file = f; |
| QLIST_INIT(&mis_current->loadvm_handlers); |
| |
| return mis_current; |
| } |
| |
| void migration_incoming_state_destroy(void) |
| { |
| 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; |
| } |
| |
| 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_co(void *opaque) |
| { |
| QEMUFile *f = opaque; |
| Error *local_err = NULL; |
| int ret; |
| |
| migration_incoming_state_new(f); |
| migrate_generate_event(MIGRATION_STATUS_ACTIVE); |
| ret = qemu_loadvm_state(f); |
| |
| qemu_fclose(f); |
| free_xbzrle_decoded_buf(); |
| migration_incoming_state_destroy(); |
| |
| if (ret < 0) { |
| migrate_generate_event(MIGRATION_STATUS_FAILED); |
| error_report("load of migration failed: %s", strerror(-ret)); |
| migrate_decompress_threads_join(); |
| exit(EXIT_FAILURE); |
| } |
| |
| /* Make sure all file formats flush their mutable metadata */ |
| bdrv_invalidate_cache_all(&local_err); |
| if (local_err) { |
| migrate_generate_event(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_generate_event(MIGRATION_STATUS_COMPLETED); |
| } |
| |
| 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); |
| } |
| |
| /* 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; |
| } |
| |
| 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_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 (s->state == MIGRATION_STATUS_ACTIVE || |
| s->state == MIGRATION_STATUS_SETUP) { |
| error_setg(errp, QERR_MIGRATION_ACTIVE); |
| return; |
| } |
| |
| for (cap = params; cap; cap = cap->next) { |
| s->enabled_capabilities[cap->value->capability] = cap->value->state; |
| } |
| } |
| |
| 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; |
| } |
| } |
| |
| /* shared migration helpers */ |
| |
| static void migrate_set_state(MigrationState *s, int old_state, int new_state) |
| { |
| if (atomic_cmpxchg(&s->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; |
| |
| if (s->file) { |
| trace_migrate_fd_cleanup(); |
| qemu_mutex_unlock_iothread(); |
| qemu_thread_join(&s->thread); |
| qemu_mutex_lock_iothread(); |
| |
| migrate_compress_threads_join(); |
| qemu_fclose(s->file); |
| s->file = NULL; |
| } |
| |
| assert(s->state != MIGRATION_STATUS_ACTIVE); |
| |
| if (s->state != MIGRATION_STATUS_COMPLETED) { |
| qemu_savevm_state_cancel(); |
| if (s->state == MIGRATION_STATUS_CANCELLING) { |
| migrate_set_state(s, 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->file == NULL); |
| migrate_set_state(s, 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()->file; |
| trace_migrate_fd_cancel(); |
| |
| do { |
| old_state = s->state; |
| if (old_state != MIGRATION_STATUS_SETUP && |
| old_state != MIGRATION_STATUS_ACTIVE) { |
| break; |
| } |
| migrate_set_state(s, 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); |
| } |
| |
| 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; |
| int compress_level = s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL]; |
| int compress_thread_count = |
| s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS]; |
| int decompress_thread_count = |
| s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS]; |
| int x_cpu_throttle_initial = |
| s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL]; |
| int x_cpu_throttle_increment = |
| s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT]; |
| |
| memcpy(enabled_capabilities, s->enabled_capabilities, |
| sizeof(enabled_capabilities)); |
| |
| memset(s, 0, sizeof(*s)); |
| s->params = *params; |
| memcpy(s->enabled_capabilities, enabled_capabilities, |
| sizeof(enabled_capabilities)); |
| s->xbzrle_cache_size = xbzrle_cache_size; |
| |
| s->parameters[MIGRATION_PARAMETER_COMPRESS_LEVEL] = compress_level; |
| s->parameters[MIGRATION_PARAMETER_COMPRESS_THREADS] = |
| compress_thread_count; |
| s->parameters[MIGRATION_PARAMETER_DECOMPRESS_THREADS] = |
| decompress_thread_count; |
| s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INITIAL] = |
| x_cpu_throttle_initial; |
| s->parameters[MIGRATION_PARAMETER_X_CPU_THROTTLE_INCREMENT] = |
| x_cpu_throttle_increment; |
| s->bandwidth_limit = bandwidth_limit; |
| migrate_set_state(s, MIGRATION_STATUS_NONE, MIGRATION_STATUS_SETUP); |
| |
| 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 (s->state == MIGRATION_STATUS_ACTIVE || |
| s->state == MIGRATION_STATUS_SETUP || |
| 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; |
| } |
| |
| /* We are starting a new migration, so we want to start in a clean |
| state. This change is only needed if previous migration |
| failed/was cancelled. We don't use migrate_set_state() because |
| we are setting the initial state, not changing it. */ |
| s->state = MIGRATION_STATUS_NONE; |
| |
| s = migrate_init(¶ms); |
| |
| 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, 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->file) { |
| qemu_file_set_rate_limit(s->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_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_completion: Used by migration_thread when there's not much left. |
| * The caller 'breaks' the loop when this returns. |
| * |
| * @s: Current migration state |
| * @*old_vm_running: Pointer to old_vm_running flag |
| * @*start_time: Pointer to time to update |
| */ |
| static void migration_completion(MigrationState *s, bool *old_vm_running, |
| int64_t *start_time) |
| { |
| int ret; |
| |
| 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) { |
| qemu_file_set_rate_limit(s->file, INT64_MAX); |
| qemu_savevm_state_complete(s->file); |
| } |
| } |
| qemu_mutex_unlock_iothread(); |
| |
| if (ret < 0) { |
| goto fail; |
| } |
| |
| if (qemu_file_get_error(s->file)) { |
| trace_migration_completion_file_err(); |
| goto fail; |
| } |
| |
| migrate_set_state(s, MIGRATION_STATUS_ACTIVE, MIGRATION_STATUS_COMPLETED); |
| return; |
| |
| fail: |
| migrate_set_state(s, MIGRATION_STATUS_ACTIVE, MIGRATION_STATUS_FAILED); |
| } |
| |
| /* migration thread support */ |
| |
| static void *migration_thread(void *opaque) |
| { |
| MigrationState *s = opaque; |
| 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; |
| bool old_vm_running = false; |
| |
| rcu_register_thread(); |
| |
| qemu_savevm_state_header(s->file); |
| qemu_savevm_state_begin(s->file, &s->params); |
| |
| s->setup_time = qemu_clock_get_ms(QEMU_CLOCK_HOST) - setup_start; |
| migrate_set_state(s, MIGRATION_STATUS_SETUP, MIGRATION_STATUS_ACTIVE); |
| |
| while (s->state == MIGRATION_STATUS_ACTIVE) { |
| int64_t current_time; |
| uint64_t pending_size; |
| |
| if (!qemu_file_rate_limit(s->file)) { |
| pending_size = qemu_savevm_state_pending(s->file, max_size); |
| trace_migrate_pending(pending_size, max_size); |
| if (pending_size && pending_size >= max_size) { |
| qemu_savevm_state_iterate(s->file); |
| } else { |
| trace_migration_thread_low_pending(pending_size); |
| migration_completion(s, &old_vm_running, &start_time); |
| break; |
| } |
| } |
| |
| if (qemu_file_get_error(s->file)) { |
| migrate_set_state(s, MIGRATION_STATUS_ACTIVE, |
| MIGRATION_STATUS_FAILED); |
| break; |
| } |
| current_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
| if (current_time >= initial_time + BUFFER_DELAY) { |
| uint64_t transferred_bytes = qemu_ftell(s->file) - initial_bytes; |
| uint64_t time_spent = current_time - initial_time; |
| double bandwidth = transferred_bytes / time_spent; |
| max_size = bandwidth * migrate_max_downtime() / 1000000; |
| |
| s->mbps = time_spent ? (((double) transferred_bytes * 8.0) / |
| ((double) time_spent / 1000.0)) / 1000.0 / 1000.0 : -1; |
| |
| 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->file); |
| initial_time = current_time; |
| initial_bytes = qemu_ftell(s->file); |
| } |
| if (qemu_file_rate_limit(s->file)) { |
| /* usleep expects microseconds */ |
| g_usleep((initial_time + BUFFER_DELAY - current_time)*1000); |
| } |
| } |
| |
| /* If we enabled cpu throttling for auto-converge, turn it off. */ |
| cpu_throttle_stop(); |
| |
| qemu_mutex_lock_iothread(); |
| if (s->state == MIGRATION_STATUS_COMPLETED) { |
| int64_t end_time = qemu_clock_get_ms(QEMU_CLOCK_REALTIME); |
| uint64_t transferred_bytes = qemu_ftell(s->file); |
| s->total_time = end_time - s->total_time; |
| 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) { |
| 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->file, |
| s->bandwidth_limit / XFER_LIMIT_RATIO); |
| |
| /* Notify before starting migration thread */ |
| notifier_list_notify(&migration_state_notifiers, s); |
| |
| migrate_compress_threads_create(); |
| qemu_thread_create(&s->thread, "migration", migration_thread, s, |
| QEMU_THREAD_JOINABLE); |
| } |
