migration: Create migration_has_all_channels

This function allows us to decide when to close the listener socket.
For now, we only need one connection.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Daniel P. Berrange <berrange@redhat.com>

migration/migration.c

@@ -384,6 +384,17 @@ void migration_ioc_process_incoming(QIOChannel *ioc)
     /* We still only have a single channel.  Nothing to do here yet */
 }
 
+/**
+ * @migration_has_all_channels: We have received all channels that we need
+ *
+ * Returns true when we have got connections to all the channels that
+ * we need for migration.
+ */
+bool migration_has_all_channels(void)
+{
+    return true;
+}
+
 /*
  * Send a 'SHUT' message on the return channel with the given value
  * to indicate that we've finished with the RP.  Non-0 value indicates

migration/migration.h

@@ -155,6 +155,8 @@ void migrate_set_state(int *state, int old_state, int new_state);
 void migration_fd_process_incoming(QEMUFile *f);
 void migration_ioc_process_incoming(QIOChannel *ioc);
 
+bool  migration_has_all_channels(void);
+
 uint64_t migrate_max_downtime(void);
 
 void migrate_fd_error(MigrationState *s, const Error *error);

migration/socket.c

@@ -152,9 +152,13 @@ static gboolean socket_accept_incoming_migration(QIOChannel *ioc,
     object_unref(OBJECT(sioc));
 
 out:
+    if (migration_has_all_channels()) {
         /* Close listening socket as its no longer needed */
         qio_channel_close(ioc, NULL);
         return G_SOURCE_REMOVE;
+    } else {
+        return G_SOURCE_CONTINUE;
+    }
 }