migration: multi-mode notifier

Allow a notifier to be added for multiple migration modes.
To allow a notifier to appear on multiple per-node lists, use
a generic list type.  We can no longer use NotifierWithReturnList,
because it shoe horns the notifier onto a single list.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/1759332851-370353-2-git-send-email-steven.sistare@oracle.com
Signed-off-by: Peter Xu <peterx@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/migration/misc.h b/include/migration/misc.h
index a261f99d89..592b93021e 100644
--- a/include/migration/misc.h
+++ b/include/migration/misc.h
@@ -95,7 +95,19 @@ void migration_add_notifier(NotifierWithReturn *notify,
 void migration_add_notifier_mode(NotifierWithReturn *notify,
                                  MigrationNotifyFunc func, MigMode mode);
 
+/*
+ * Same as migration_add_notifier, but applies to all @mode in the argument
+ * list.  The list is terminated by -1 or MIG_MODE_ALL.  For the latter,
+ * the notifier is added for all modes.
+ */
+void migration_add_notifier_modes(NotifierWithReturn *notify,
+                                  MigrationNotifyFunc func, MigMode mode, ...);
+
+/*
+ * Remove a notifier from all modes.
+ */
 void migration_remove_notifier(NotifierWithReturn *notify);
+
 void migration_file_set_error(int ret, Error *err);
 
 /* True if incoming migration entered POSTCOPY_INCOMING_DISCARD */