include/migration/colo.h

   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 #ifndef QEMU_COLO_H
  14 #define QEMU_COLO_H
  15
  16 #include "qapi/qapi-types-migration.h"
  17
  18 enum colo_event {
  19     COLO_EVENT_NONE,
  20     COLO_EVENT_CHECKPOINT,
  21     COLO_EVENT_FAILOVER,
  22 };
  23
  24 void migrate_start_colo_process(MigrationState *s);
  25 bool migration_in_colo_state(void);
  26
  27 /* loadvm */
  28 int migration_incoming_enable_colo(void);
  29 void migration_incoming_disable_colo(void);
  30 bool migration_incoming_colo_enabled(void);
  31 bool migration_incoming_in_colo_state(void);
  32
  33 COLOMode get_colo_mode(void);
  34
  35 /* failover */
  36 void colo_do_failover(void);
  37
  38 /*
  39  * colo_checkpoint_delay_set
  40  *
  41  * Handles change of x-checkpoint-delay migration parameter, called from
  42  * migrate_params_apply() to notify COLO module about the change.
  43  */
  44 void colo_checkpoint_delay_set(void);
  45
  46 /*
  47  * Starts COLO incoming process. Called from process_incoming_migration_co()
  48  * after loading the state.
  49  *
  50  * Called with BQL locked, may temporary release BQL.
  51  */
  52 int coroutine_fn colo_incoming_co(void);
  53
  54 void colo_shutdown(void);
  55 #endif