migration/colo-failover.c

   1 /*
   2  * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
   3  * (a.k.a. Fault Tolerance or Continuous Replication)
   4  *
   5  * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
   6  * Copyright (c) 2016 FUJITSU LIMITED
   7  * Copyright (c) 2016 Intel Corporation
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or
  10  * later.  See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "migration/colo.h"
  15 #include "migration/failover.h"
  16 #include "qmp-commands.h"
  17 #include "qapi/qmp/qerror.h"
  18
  19 static QEMUBH *failover_bh;
  20
  21 static void colo_failover_bh(void *opaque)
  22 {
  23     qemu_bh_delete(failover_bh);
  24     failover_bh = NULL;
  25     /* TODO: Do failover work */
  26 }
  27
  28 void failover_request_active(Error **errp)
  29 {
  30     failover_bh = qemu_bh_new(colo_failover_bh, NULL);
  31     qemu_bh_schedule(failover_bh);
  32 }
  33
  34 void qmp_x_colo_lost_heartbeat(Error **errp)
  35 {
  36     if (get_colo_mode() == COLO_MODE_UNKNOWN) {
  37         error_setg(errp, QERR_FEATURE_DISABLED, "colo");
  38         return;
  39     }
  40
  41     failover_request_active(errp);
  42 }