diff options
Diffstat (limited to 'qemu/migration/migration.c')
| -rw-r--r-- | qemu/migration/migration.c | 1048 |
1 files changed, 1048 insertions, 0 deletions
diff --git a/qemu/migration/migration.c b/qemu/migration/migration.c new file mode 100644 index 000000000..662e77e4e --- /dev/null +++ b/qemu/migration/migration.c @@ -0,0 +1,1048 @@ +/* + * 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" + +#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) + +/* 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 + +/* 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, + }; + + 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_malloc0(sizeof(MigrationIncomingState)); + 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); + } + migrate_generate_event(MIGRATION_STATUS_COMPLETED); + qemu_announce_self(); + + /* Make sure all file formats flush their mutable metadata */ + bdrv_invalidate_cache_all(&local_err); + if (local_err) { + error_report_err(local_err); + migrate_decompress_threads_join(); + exit(EXIT_FAILURE); + } + + /* 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(); +} + +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]; + + 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(); + } + + 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, 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_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; + } +} + +/* 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]; + + 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->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 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 { + 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) { + migrate_set_state(s, MIGRATION_STATUS_ACTIVE, + MIGRATION_STATUS_FAILED); + break; + } + + if (!qemu_file_get_error(s->file)) { + migrate_set_state(s, MIGRATION_STATUS_ACTIVE, + MIGRATION_STATUS_COMPLETED); + 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); + } + } + + 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); +} |