migration: pause-before-switchover for postcopy
Add pause-before-switchover support for postcopy. After starting postcopy it will transition active->pre-switchover->postcopy_active Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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@ -104,6 +104,9 @@ enum mig_rp_message_type {
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static MigrationState *current_migration;
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static MigrationState *current_migration;
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static bool migration_object_check(MigrationState *ms, Error **errp);
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static bool migration_object_check(MigrationState *ms, Error **errp);
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static int migration_maybe_pause(MigrationState *s,
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int *current_active_state,
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int new_state);
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void migration_object_init(void)
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void migration_object_init(void)
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{
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{
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@ -1820,8 +1823,11 @@ static int postcopy_start(MigrationState *ms, bool *old_vm_running)
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QEMUFile *fb;
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QEMUFile *fb;
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int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
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int64_t time_at_stop = qemu_clock_get_ms(QEMU_CLOCK_REALTIME);
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bool restart_block = false;
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bool restart_block = false;
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migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
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int cur_state = MIGRATION_STATUS_ACTIVE;
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MIGRATION_STATUS_POSTCOPY_ACTIVE);
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if (!migrate_pause_before_switchover()) {
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migrate_set_state(&ms->state, MIGRATION_STATUS_ACTIVE,
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MIGRATION_STATUS_POSTCOPY_ACTIVE);
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}
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trace_postcopy_start();
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trace_postcopy_start();
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qemu_mutex_lock_iothread();
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qemu_mutex_lock_iothread();
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@ -1835,6 +1841,12 @@ static int postcopy_start(MigrationState *ms, bool *old_vm_running)
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goto fail;
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goto fail;
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}
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}
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ret = migration_maybe_pause(ms, &cur_state,
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MIGRATION_STATUS_POSTCOPY_ACTIVE);
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if (ret < 0) {
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goto fail;
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}
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ret = bdrv_inactivate_all();
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ret = bdrv_inactivate_all();
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if (ret < 0) {
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if (ret < 0) {
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goto fail;
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goto fail;
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@ -1977,7 +1989,9 @@ fail:
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* migrate_pause_before_switchover called with the iothread locked
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* migrate_pause_before_switchover called with the iothread locked
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* Returns: 0 on success
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* Returns: 0 on success
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*/
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*/
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static int migration_maybe_pause(MigrationState *s, int *current_active_state)
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static int migration_maybe_pause(MigrationState *s,
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int *current_active_state,
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int new_state)
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{
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{
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if (!migrate_pause_before_switchover()) {
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if (!migrate_pause_before_switchover()) {
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return 0;
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return 0;
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@ -1998,11 +2012,11 @@ static int migration_maybe_pause(MigrationState *s, int *current_active_state)
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MIGRATION_STATUS_PRE_SWITCHOVER);
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MIGRATION_STATUS_PRE_SWITCHOVER);
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qemu_sem_wait(&s->pause_sem);
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qemu_sem_wait(&s->pause_sem);
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migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
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migrate_set_state(&s->state, MIGRATION_STATUS_PRE_SWITCHOVER,
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MIGRATION_STATUS_DEVICE);
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new_state);
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*current_active_state = MIGRATION_STATUS_DEVICE;
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*current_active_state = new_state;
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qemu_mutex_lock_iothread();
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qemu_mutex_lock_iothread();
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return s->state == MIGRATION_STATUS_DEVICE ? 0 : -EINVAL;
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return s->state == new_state ? 0 : -EINVAL;
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}
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}
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/**
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/**
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@ -2031,7 +2045,8 @@ static void migration_completion(MigrationState *s, int current_active_state,
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bool inactivate = !migrate_colo_enabled();
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bool inactivate = !migrate_colo_enabled();
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ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
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ret = vm_stop_force_state(RUN_STATE_FINISH_MIGRATE);
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if (ret >= 0) {
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if (ret >= 0) {
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ret = migration_maybe_pause(s, ¤t_active_state);
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ret = migration_maybe_pause(s, ¤t_active_state,
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MIGRATION_STATUS_DEVICE);
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}
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}
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if (ret >= 0) {
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if (ret >= 0) {
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qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
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qemu_file_set_rate_limit(s->to_dst_file, INT64_MAX);
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