migration: notifier error checking
Check the status returned by migration notifiers for event type MIG_EVENT_PRECOPY_SETUP, and report errors. None of the notifiers return an error status at this time. Signed-off-by: Steve Sistare <steven.sistare@oracle.com> Reviewed-by: Peter Xu <peterx@redhat.com> Link: https://lore.kernel.org/r/1708622920-68779-10-git-send-email-steven.sistare@oracle.com Signed-off-by: Peter Xu <peterx@redhat.com>
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@ -72,6 +72,11 @@ typedef struct MigrationEvent {
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MigrationEventType type;
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} MigrationEvent;
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/*
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* A MigrationNotifyFunc may return an error code and an Error object,
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* but only when @e->type is MIG_EVENT_PRECOPY_SETUP. The code is an int
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* to allow for different failure modes and recovery actions.
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*/
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typedef int (*MigrationNotifyFunc)(NotifierWithReturn *notify,
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MigrationEvent *e, Error **errp);
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@ -93,7 +98,8 @@ void migration_add_notifier_mode(NotifierWithReturn *notify,
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MigrationNotifyFunc func, MigMode mode);
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void migration_remove_notifier(NotifierWithReturn *notify);
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void migration_call_notifiers(MigrationState *s, MigrationEventType type);
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int migration_call_notifiers(MigrationState *s, MigrationEventType type,
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Error **errp);
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bool migration_in_setup(MigrationState *);
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bool migration_has_finished(MigrationState *);
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bool migration_has_failed(MigrationState *);
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@ -1376,7 +1376,7 @@ static void migrate_fd_cleanup(MigrationState *s)
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}
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type = migration_has_failed(s) ? MIG_EVENT_PRECOPY_FAILED :
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MIG_EVENT_PRECOPY_DONE;
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migration_call_notifiers(s, type);
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migration_call_notifiers(s, type, NULL);
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block_cleanup_parameters();
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yank_unregister_instance(MIGRATION_YANK_INSTANCE);
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}
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@ -1489,13 +1489,18 @@ void migration_remove_notifier(NotifierWithReturn *notify)
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}
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}
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void migration_call_notifiers(MigrationState *s, MigrationEventType type)
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int migration_call_notifiers(MigrationState *s, MigrationEventType type,
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Error **errp)
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{
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MigMode mode = s->parameters.mode;
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MigrationEvent e;
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int ret;
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e.type = type;
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notifier_with_return_list_notify(&migration_state_notifiers[mode], &e, 0);
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ret = notifier_with_return_list_notify(&migration_state_notifiers[mode],
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&e, errp);
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assert(!ret || type == MIG_EVENT_PRECOPY_SETUP);
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return ret;
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}
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bool migration_in_setup(MigrationState *s)
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@ -2549,7 +2554,7 @@ static int postcopy_start(MigrationState *ms, Error **errp)
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* at the transition to postcopy and after the device state; in particular
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* spice needs to trigger a transition now
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*/
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migration_call_notifiers(ms, MIG_EVENT_PRECOPY_DONE);
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migration_call_notifiers(ms, MIG_EVENT_PRECOPY_DONE, NULL);
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migration_downtime_end(ms);
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@ -2569,11 +2574,10 @@ static int postcopy_start(MigrationState *ms, Error **errp)
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ret = qemu_file_get_error(ms->to_dst_file);
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if (ret) {
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error_setg(errp, "postcopy_start: Migration stream errored");
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migrate_set_state(&ms->state, MIGRATION_STATUS_POSTCOPY_ACTIVE,
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MIGRATION_STATUS_FAILED);
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error_setg_errno(errp, -ret, "postcopy_start: Migration stream error");
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bql_lock();
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goto fail;
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}
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trace_postcopy_preempt_enabled(migrate_postcopy_preempt());
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return ret;
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@ -2594,6 +2598,7 @@ fail:
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error_report_err(local_err);
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}
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}
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migration_call_notifiers(ms, MIG_EVENT_PRECOPY_FAILED, NULL);
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bql_unlock();
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return -1;
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}
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@ -3613,7 +3618,9 @@ void migrate_fd_connect(MigrationState *s, Error *error_in)
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rate_limit = migrate_max_bandwidth();
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/* Notify before starting migration thread */
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migration_call_notifiers(s, MIG_EVENT_PRECOPY_SETUP);
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if (migration_call_notifiers(s, MIG_EVENT_PRECOPY_SETUP, &local_err)) {
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goto fail;
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}
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}
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migration_rate_set(rate_limit);
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