diff options
Diffstat (limited to 'qemu/migration/migration.c')
| -rw-r--r-- | qemu/migration/migration.c | 1810 |
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(¤t_migration.src_page_req_mutex); - once = true; - } - 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->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(¶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->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); -} - |