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>

1 files changed, 7 insertions, 1 deletions

diff --git a/include/migration/misc.h b/include/migration/misc.h
index 4dc06a92b7..e4933b815b 100644
--- a/include/migration/misc.h
+++ b/include/migration/misc.h
@@ -72,6 +72,11 @@ typedef struct MigrationEvent {
     MigrationEventType type;
 } MigrationEvent;
 
+/*
+ * A MigrationNotifyFunc may return an error code and an Error object,
+ * but only when @e->type is MIG_EVENT_PRECOPY_SETUP.  The code is an int
+ * to allow for different failure modes and recovery actions.
+ */
 typedef int (*MigrationNotifyFunc)(NotifierWithReturn *notify,
                                    MigrationEvent *e, Error **errp);
 
@@ -93,7 +98,8 @@ void migration_add_notifier_mode(NotifierWithReturn *notify,
                                  MigrationNotifyFunc func, MigMode mode);
 
 void migration_remove_notifier(NotifierWithReturn *notify);
-void migration_call_notifiers(MigrationState *s, MigrationEventType type);
+int migration_call_notifiers(MigrationState *s, MigrationEventType type,
+                             Error **errp);
 bool migration_in_setup(MigrationState *);
 bool migration_has_finished(MigrationState *);
 bool migration_has_failed(MigrationState *);