3 files changed, 31 insertions, 0 deletions

diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
index f91015a4f8..1f675b792f 100644
--- a/migration/block-dirty-bitmap.c
+++ b/migration/block-dirty-bitmap.c
@@ -657,6 +657,22 @@ static void cancel_incoming_locked(DBMLoadState *s)
     s->bitmaps = NULL;
 }
 
+void dirty_bitmap_mig_cancel_outgoing(void)
+{
+    dirty_bitmap_do_save_cleanup(&dbm_state.save);
+}
+
+void dirty_bitmap_mig_cancel_incoming(void)
+{
+    DBMLoadState *s = &dbm_state.load;
+
+    qemu_mutex_lock(&s->lock);
+
+    cancel_incoming_locked(s);
+
+    qemu_mutex_unlock(&s->lock);
+}
+
 static void dirty_bitmap_load_complete(QEMUFile *f, DBMLoadState *s)
 {
     GSList *item;
diff --git a/migration/migration.c b/migration/migration.c
index 1c61428988..8fe36339db 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -188,6 +188,19 @@ void migration_shutdown(void)
      */
     migrate_fd_cancel(current_migration);
     object_unref(OBJECT(current_migration));
+
+    /*
+     * Cancel outgoing migration of dirty bitmaps. It should
+     * at least unref used block nodes.
+     */
+    dirty_bitmap_mig_cancel_outgoing();
+
+    /*
+     * Cancel incoming migration of dirty bitmaps. Dirty bitmaps
+     * are non-critical data, and their loss never considered as
+     * something serious.
+     */
+    dirty_bitmap_mig_cancel_incoming();
 }
 
 /* For outgoing */
diff --git a/migration/migration.h b/migration/migration.h
index ab20c756f5..6c6a931d0d 100644
--- a/migration/migration.h
+++ b/migration/migration.h
@@ -335,6 +335,8 @@ void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis,
 void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value);
 
 void dirty_bitmap_mig_before_vm_start(void);
+void dirty_bitmap_mig_cancel_outgoing(void);
+void dirty_bitmap_mig_cancel_incoming(void);
 void migrate_add_address(SocketAddress *address);
 
 int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque);