xref: /openbmc/qemu/include/migration/colo.h (revision 2e1cacfb)
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 void coroutine_fn colo_incoming_co(void);
53 
54 void colo_shutdown(void);
55 #endif
56