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/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu-common.h" |
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#include "migration.h" |
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#include "monitor.h" |
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#include "buffered_file.h" |
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#include "sysemu.h" |
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#include "block/block.h" |
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#include "qemu_socket.h" |
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#include "block-migration.h" |
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#include "qmp-commands.h" |
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//#define DEBUG_MIGRATION
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#ifdef DEBUG_MIGRATION
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#define DPRINTF(fmt, ...) \
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do { printf("migration: " fmt, ## __VA_ARGS__); } while (0) |
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#else
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#define DPRINTF(fmt, ...) \
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do { } while (0) |
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#endif
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enum {
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MIG_STATE_ERROR, |
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MIG_STATE_SETUP, |
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MIG_STATE_CANCELLED, |
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MIG_STATE_ACTIVE, |
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MIG_STATE_COMPLETED, |
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}; |
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#define MAX_THROTTLE (32 << 20) /* Migration speed throttling */ |
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/* Migration XBZRLE default cache size */
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#define DEFAULT_MIGRATE_CACHE_SIZE (64 * 1024 * 1024) |
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static NotifierList migration_state_notifiers =
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NOTIFIER_LIST_INITIALIZER(migration_state_notifiers); |
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/* When we add fault tolerance, we could have several
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migrations at once. For now we don't need to add
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dynamic creation of migration */
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MigrationState *migrate_get_current(void)
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{ |
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static MigrationState current_migration = {
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.state = MIG_STATE_SETUP, |
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.bandwidth_limit = MAX_THROTTLE, |
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.xbzrle_cache_size = DEFAULT_MIGRATE_CACHE_SIZE, |
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}; |
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return ¤t_migration;
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} |
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void qemu_start_incoming_migration(const char *uri, Error **errp) |
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{ |
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const char *p; |
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if (strstart(uri, "tcp:", &p)) |
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tcp_start_incoming_migration(p, errp); |
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#if !defined(WIN32)
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else if (strstart(uri, "exec:", &p)) |
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exec_start_incoming_migration(p, errp); |
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else if (strstart(uri, "unix:", &p)) |
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unix_start_incoming_migration(p, errp); |
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else if (strstart(uri, "fd:", &p)) |
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fd_start_incoming_migration(p, errp); |
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#endif
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else {
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error_setg(errp, "unknown migration protocol: %s\n", uri);
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} |
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} |
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static void process_incoming_migration_co(void *opaque) |
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{ |
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QEMUFile *f = opaque; |
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int ret;
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ret = qemu_loadvm_state(f); |
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qemu_set_fd_handler(qemu_get_fd(f), NULL, NULL, NULL); |
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qemu_fclose(f); |
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if (ret < 0) { |
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fprintf(stderr, "load of migration failed\n");
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exit(0);
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} |
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qemu_announce_self(); |
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DPRINTF("successfully loaded vm state\n");
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bdrv_clear_incoming_migration_all(); |
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/* Make sure all file formats flush their mutable metadata */
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bdrv_invalidate_cache_all(); |
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if (autostart) {
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vm_start(); |
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} else {
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runstate_set(RUN_STATE_PAUSED); |
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} |
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} |
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static void enter_migration_coroutine(void *opaque) |
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{ |
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Coroutine *co = opaque; |
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qemu_coroutine_enter(co, NULL);
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} |
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void process_incoming_migration(QEMUFile *f)
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{ |
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Coroutine *co = qemu_coroutine_create(process_incoming_migration_co); |
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int fd = qemu_get_fd(f);
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assert(fd != -1);
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socket_set_nonblock(fd); |
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qemu_set_fd_handler(fd, enter_migration_coroutine, NULL, co);
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qemu_coroutine_enter(co, f); |
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} |
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/* amount of nanoseconds we are willing to wait for migration to be down.
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* the choice of nanoseconds is because it is the maximum resolution that
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* get_clock() can achieve. It is an internal measure. All user-visible
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* units must be in seconds */
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static uint64_t max_downtime = 30000000; |
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uint64_t migrate_max_downtime(void)
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{ |
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return max_downtime;
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} |
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MigrationCapabilityStatusList *qmp_query_migrate_capabilities(Error **errp) |
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{ |
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MigrationCapabilityStatusList *head = NULL;
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MigrationCapabilityStatusList *caps; |
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MigrationState *s = migrate_get_current(); |
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int i;
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for (i = 0; i < MIGRATION_CAPABILITY_MAX; i++) { |
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if (head == NULL) { |
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head = g_malloc0(sizeof(*caps));
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caps = head; |
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} else {
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caps->next = g_malloc0(sizeof(*caps));
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caps = caps->next; |
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} |
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caps->value = |
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g_malloc(sizeof(*caps->value));
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caps->value->capability = i; |
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caps->value->state = s->enabled_capabilities[i]; |
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} |
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return head;
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} |
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static void get_xbzrle_cache_stats(MigrationInfo *info) |
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{ |
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if (migrate_use_xbzrle()) {
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info->has_xbzrle_cache = true;
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info->xbzrle_cache = g_malloc0(sizeof(*info->xbzrle_cache));
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info->xbzrle_cache->cache_size = migrate_xbzrle_cache_size(); |
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info->xbzrle_cache->bytes = xbzrle_mig_bytes_transferred(); |
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info->xbzrle_cache->pages = xbzrle_mig_pages_transferred(); |
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info->xbzrle_cache->cache_miss = xbzrle_mig_pages_cache_miss(); |
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info->xbzrle_cache->overflow = xbzrle_mig_pages_overflow(); |
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} |
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} |
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MigrationInfo *qmp_query_migrate(Error **errp) |
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{ |
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MigrationInfo *info = g_malloc0(sizeof(*info));
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MigrationState *s = migrate_get_current(); |
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switch (s->state) {
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case MIG_STATE_SETUP:
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/* no migration has happened ever */
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break;
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case MIG_STATE_ACTIVE:
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info->has_status = true;
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info->status = g_strdup("active");
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info->has_total_time = true;
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info->total_time = qemu_get_clock_ms(rt_clock) |
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- s->total_time; |
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info->has_expected_downtime = true;
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info->expected_downtime = s->expected_downtime; |
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info->has_ram = true;
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info->ram = g_malloc0(sizeof(*info->ram));
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info->ram->transferred = ram_bytes_transferred(); |
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info->ram->remaining = ram_bytes_remaining(); |
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info->ram->total = ram_bytes_total(); |
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info->ram->duplicate = dup_mig_pages_transferred(); |
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info->ram->normal = norm_mig_pages_transferred(); |
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info->ram->normal_bytes = norm_mig_bytes_transferred(); |
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info->ram->dirty_pages_rate = s->dirty_pages_rate; |
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if (blk_mig_active()) {
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info->has_disk = true;
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info->disk = g_malloc0(sizeof(*info->disk));
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info->disk->transferred = blk_mig_bytes_transferred(); |
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info->disk->remaining = blk_mig_bytes_remaining(); |
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info->disk->total = blk_mig_bytes_total(); |
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} |
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get_xbzrle_cache_stats(info); |
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break;
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case MIG_STATE_COMPLETED:
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get_xbzrle_cache_stats(info); |
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info->has_status = true;
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info->status = g_strdup("completed");
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info->total_time = s->total_time; |
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info->has_downtime = true;
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info->downtime = s->downtime; |
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info->has_ram = true;
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info->ram = g_malloc0(sizeof(*info->ram));
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info->ram->transferred = ram_bytes_transferred(); |
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info->ram->remaining = 0;
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info->ram->total = ram_bytes_total(); |
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info->ram->duplicate = dup_mig_pages_transferred(); |
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info->ram->normal = norm_mig_pages_transferred(); |
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info->ram->normal_bytes = norm_mig_bytes_transferred(); |
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break;
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case MIG_STATE_ERROR:
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info->has_status = true;
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info->status = g_strdup("failed");
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break;
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case MIG_STATE_CANCELLED:
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info->has_status = true;
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info->status = g_strdup("cancelled");
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break;
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} |
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return info;
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} |
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void qmp_migrate_set_capabilities(MigrationCapabilityStatusList *params,
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Error **errp) |
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{ |
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MigrationState *s = migrate_get_current(); |
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MigrationCapabilityStatusList *cap; |
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if (s->state == MIG_STATE_ACTIVE) {
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error_set(errp, QERR_MIGRATION_ACTIVE); |
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return;
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} |
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for (cap = params; cap; cap = cap->next) {
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s->enabled_capabilities[cap->value->capability] = cap->value->state; |
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} |
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} |
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/* shared migration helpers */
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static int migrate_fd_cleanup(MigrationState *s) |
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{ |
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int ret = 0; |
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if (s->file) {
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DPRINTF("closing file\n");
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ret = qemu_fclose(s->file); |
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s->file = NULL;
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} |
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migrate_fd_close(s); |
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return ret;
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} |
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void migrate_fd_error(MigrationState *s)
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{ |
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DPRINTF("setting error state\n");
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s->state = MIG_STATE_ERROR; |
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notifier_list_notify(&migration_state_notifiers, s); |
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migrate_fd_cleanup(s); |
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} |
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static void migrate_fd_completed(MigrationState *s) |
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{ |
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DPRINTF("setting completed state\n");
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if (migrate_fd_cleanup(s) < 0) { |
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s->state = MIG_STATE_ERROR; |
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} else {
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s->state = MIG_STATE_COMPLETED; |
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runstate_set(RUN_STATE_POSTMIGRATE); |
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} |
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notifier_list_notify(&migration_state_notifiers, s); |
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} |
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static void migrate_fd_put_notify(void *opaque) |
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{ |
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MigrationState *s = opaque; |
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int ret;
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qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
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ret = qemu_file_put_notify(s->file); |
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if (ret) {
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migrate_fd_error(s); |
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} |
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} |
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ssize_t migrate_fd_put_buffer(MigrationState *s, const void *data, |
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size_t size) |
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{ |
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ssize_t ret; |
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if (s->state != MIG_STATE_ACTIVE) {
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return -EIO;
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} |
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do {
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ret = s->write(s, data, size); |
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} while (ret == -1 && ((s->get_error(s)) == EINTR)); |
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if (ret == -1) |
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ret = -(s->get_error(s)); |
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if (ret == -EAGAIN) {
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qemu_set_fd_handler2(s->fd, NULL, NULL, migrate_fd_put_notify, s); |
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} |
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return ret;
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} |
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void migrate_fd_put_ready(MigrationState *s)
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{ |
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int ret;
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if (s->state != MIG_STATE_ACTIVE) {
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DPRINTF("put_ready returning because of non-active state\n");
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return;
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} |
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DPRINTF("iterate\n");
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ret = qemu_savevm_state_iterate(s->file); |
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if (ret < 0) { |
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migrate_fd_error(s); |
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} else if (ret == 1) { |
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int old_vm_running = runstate_is_running();
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int64_t start_time, end_time; |
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DPRINTF("done iterating\n");
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start_time = qemu_get_clock_ms(rt_clock); |
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qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER); |
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vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); |
355 |
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if (qemu_savevm_state_complete(s->file) < 0) { |
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migrate_fd_error(s); |
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} else {
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migrate_fd_completed(s); |
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} |
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end_time = qemu_get_clock_ms(rt_clock); |
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s->total_time = end_time - s->total_time; |
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s->downtime = end_time - start_time; |
364 |
if (s->state != MIG_STATE_COMPLETED) {
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if (old_vm_running) {
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vm_start(); |
367 |
} |
368 |
} |
369 |
} |
370 |
} |
371 |
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static void migrate_fd_cancel(MigrationState *s) |
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{ |
374 |
if (s->state != MIG_STATE_ACTIVE)
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return;
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DPRINTF("cancelling migration\n");
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378 |
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s->state = MIG_STATE_CANCELLED; |
380 |
notifier_list_notify(&migration_state_notifiers, s); |
381 |
qemu_savevm_state_cancel(s->file); |
382 |
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migrate_fd_cleanup(s); |
384 |
} |
385 |
|
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int migrate_fd_wait_for_unfreeze(MigrationState *s)
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{ |
388 |
int ret;
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389 |
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DPRINTF("wait for unfreeze\n");
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391 |
if (s->state != MIG_STATE_ACTIVE)
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return -EINVAL;
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393 |
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394 |
do {
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395 |
fd_set wfds; |
396 |
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FD_ZERO(&wfds); |
398 |
FD_SET(s->fd, &wfds); |
399 |
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400 |
ret = select(s->fd + 1, NULL, &wfds, NULL, NULL); |
401 |
} while (ret == -1 && (s->get_error(s)) == EINTR); |
402 |
|
403 |
if (ret == -1) { |
404 |
return -s->get_error(s);
|
405 |
} |
406 |
return 0; |
407 |
} |
408 |
|
409 |
int migrate_fd_close(MigrationState *s)
|
410 |
{ |
411 |
int rc = 0; |
412 |
if (s->fd != -1) { |
413 |
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL); |
414 |
rc = s->close(s); |
415 |
s->fd = -1;
|
416 |
} |
417 |
return rc;
|
418 |
} |
419 |
|
420 |
void add_migration_state_change_notifier(Notifier *notify)
|
421 |
{ |
422 |
notifier_list_add(&migration_state_notifiers, notify); |
423 |
} |
424 |
|
425 |
void remove_migration_state_change_notifier(Notifier *notify)
|
426 |
{ |
427 |
notifier_remove(notify); |
428 |
} |
429 |
|
430 |
bool migration_is_active(MigrationState *s)
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431 |
{ |
432 |
return s->state == MIG_STATE_ACTIVE;
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433 |
} |
434 |
|
435 |
bool migration_has_finished(MigrationState *s)
|
436 |
{ |
437 |
return s->state == MIG_STATE_COMPLETED;
|
438 |
} |
439 |
|
440 |
bool migration_has_failed(MigrationState *s)
|
441 |
{ |
442 |
return (s->state == MIG_STATE_CANCELLED ||
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443 |
s->state == MIG_STATE_ERROR); |
444 |
} |
445 |
|
446 |
void migrate_fd_connect(MigrationState *s)
|
447 |
{ |
448 |
int ret;
|
449 |
|
450 |
s->state = MIG_STATE_ACTIVE; |
451 |
s->file = qemu_fopen_ops_buffered(s); |
452 |
|
453 |
DPRINTF("beginning savevm\n");
|
454 |
ret = qemu_savevm_state_begin(s->file, &s->params); |
455 |
if (ret < 0) { |
456 |
DPRINTF("failed, %d\n", ret);
|
457 |
migrate_fd_error(s); |
458 |
return;
|
459 |
} |
460 |
migrate_fd_put_ready(s); |
461 |
} |
462 |
|
463 |
static MigrationState *migrate_init(const MigrationParams *params) |
464 |
{ |
465 |
MigrationState *s = migrate_get_current(); |
466 |
int64_t bandwidth_limit = s->bandwidth_limit; |
467 |
bool enabled_capabilities[MIGRATION_CAPABILITY_MAX];
|
468 |
int64_t xbzrle_cache_size = s->xbzrle_cache_size; |
469 |
|
470 |
memcpy(enabled_capabilities, s->enabled_capabilities, |
471 |
sizeof(enabled_capabilities));
|
472 |
|
473 |
memset(s, 0, sizeof(*s)); |
474 |
s->bandwidth_limit = bandwidth_limit; |
475 |
s->params = *params; |
476 |
memcpy(s->enabled_capabilities, enabled_capabilities, |
477 |
sizeof(enabled_capabilities));
|
478 |
s->xbzrle_cache_size = xbzrle_cache_size; |
479 |
|
480 |
s->bandwidth_limit = bandwidth_limit; |
481 |
s->state = MIG_STATE_SETUP; |
482 |
s->total_time = qemu_get_clock_ms(rt_clock); |
483 |
|
484 |
return s;
|
485 |
} |
486 |
|
487 |
static GSList *migration_blockers;
|
488 |
|
489 |
void migrate_add_blocker(Error *reason)
|
490 |
{ |
491 |
migration_blockers = g_slist_prepend(migration_blockers, reason); |
492 |
} |
493 |
|
494 |
void migrate_del_blocker(Error *reason)
|
495 |
{ |
496 |
migration_blockers = g_slist_remove(migration_blockers, reason); |
497 |
} |
498 |
|
499 |
void qmp_migrate(const char *uri, bool has_blk, bool blk, |
500 |
bool has_inc, bool inc, bool has_detach, bool detach, |
501 |
Error **errp) |
502 |
{ |
503 |
Error *local_err = NULL;
|
504 |
MigrationState *s = migrate_get_current(); |
505 |
MigrationParams params; |
506 |
const char *p; |
507 |
|
508 |
params.blk = blk; |
509 |
params.shared = inc; |
510 |
|
511 |
if (s->state == MIG_STATE_ACTIVE) {
|
512 |
error_set(errp, QERR_MIGRATION_ACTIVE); |
513 |
return;
|
514 |
} |
515 |
|
516 |
if (qemu_savevm_state_blocked(errp)) {
|
517 |
return;
|
518 |
} |
519 |
|
520 |
if (migration_blockers) {
|
521 |
*errp = error_copy(migration_blockers->data); |
522 |
return;
|
523 |
} |
524 |
|
525 |
s = migrate_init(¶ms); |
526 |
|
527 |
if (strstart(uri, "tcp:", &p)) { |
528 |
tcp_start_outgoing_migration(s, p, &local_err); |
529 |
#if !defined(WIN32)
|
530 |
} else if (strstart(uri, "exec:", &p)) { |
531 |
exec_start_outgoing_migration(s, p, &local_err); |
532 |
} else if (strstart(uri, "unix:", &p)) { |
533 |
unix_start_outgoing_migration(s, p, &local_err); |
534 |
} else if (strstart(uri, "fd:", &p)) { |
535 |
fd_start_outgoing_migration(s, p, &local_err); |
536 |
#endif
|
537 |
} else {
|
538 |
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "uri", "a valid migration protocol"); |
539 |
return;
|
540 |
} |
541 |
|
542 |
if (local_err) {
|
543 |
migrate_fd_error(s); |
544 |
error_propagate(errp, local_err); |
545 |
return;
|
546 |
} |
547 |
|
548 |
notifier_list_notify(&migration_state_notifiers, s); |
549 |
} |
550 |
|
551 |
void qmp_migrate_cancel(Error **errp)
|
552 |
{ |
553 |
migrate_fd_cancel(migrate_get_current()); |
554 |
} |
555 |
|
556 |
void qmp_migrate_set_cache_size(int64_t value, Error **errp)
|
557 |
{ |
558 |
MigrationState *s = migrate_get_current(); |
559 |
|
560 |
/* Check for truncation */
|
561 |
if (value != (size_t)value) {
|
562 |
error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cache size",
|
563 |
"exceeding address space");
|
564 |
return;
|
565 |
} |
566 |
|
567 |
s->xbzrle_cache_size = xbzrle_cache_resize(value); |
568 |
} |
569 |
|
570 |
int64_t qmp_query_migrate_cache_size(Error **errp) |
571 |
{ |
572 |
return migrate_xbzrle_cache_size();
|
573 |
} |
574 |
|
575 |
void qmp_migrate_set_speed(int64_t value, Error **errp)
|
576 |
{ |
577 |
MigrationState *s; |
578 |
|
579 |
if (value < 0) { |
580 |
value = 0;
|
581 |
} |
582 |
|
583 |
s = migrate_get_current(); |
584 |
s->bandwidth_limit = value; |
585 |
qemu_file_set_rate_limit(s->file, s->bandwidth_limit); |
586 |
} |
587 |
|
588 |
void qmp_migrate_set_downtime(double value, Error **errp) |
589 |
{ |
590 |
value *= 1e9;
|
591 |
value = MAX(0, MIN(UINT64_MAX, value));
|
592 |
max_downtime = (uint64_t)value; |
593 |
} |
594 |
|
595 |
int migrate_use_xbzrle(void) |
596 |
{ |
597 |
MigrationState *s; |
598 |
|
599 |
s = migrate_get_current(); |
600 |
|
601 |
return s->enabled_capabilities[MIGRATION_CAPABILITY_XBZRLE];
|
602 |
} |
603 |
|
604 |
int64_t migrate_xbzrle_cache_size(void)
|
605 |
{ |
606 |
MigrationState *s; |
607 |
|
608 |
s = migrate_get_current(); |
609 |
|
610 |
return s->xbzrle_cache_size;
|
611 |
} |