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
14 #include "qemu/osdep.h"
15 #include "migration.h"
16 #include "migration/colo.h"
17 #include "migration/vmstate.h"
18 #include "trace.h"
19
20 typedef struct {
21 bool colo_requested;
22 } COLOInfo;
23
24 static COLOInfo colo_info;
25
get_colo_mode(void)26 COLOMode get_colo_mode(void)
27 {
28 if (migration_in_colo_state()) {
29 return COLO_MODE_PRIMARY;
30 } else if (migration_incoming_in_colo_state()) {
31 return COLO_MODE_SECONDARY;
32 } else {
33 return COLO_MODE_UNKNOWN;
34 }
35 }
36
colo_info_pre_save(void * opaque)37 static int colo_info_pre_save(void *opaque)
38 {
39 COLOInfo *s = opaque;
40
41 s->colo_requested = migrate_colo_enabled();
42
43 return 0;
44 }
45
colo_info_need(void * opaque)46 static bool colo_info_need(void *opaque)
47 {
48 return migrate_colo_enabled();
49 }
50
51 static const VMStateDescription colo_state = {
52 .name = "COLOState",
53 .version_id = 1,
54 .minimum_version_id = 1,
55 .pre_save = colo_info_pre_save,
56 .needed = colo_info_need,
57 .fields = (VMStateField[]) {
58 VMSTATE_BOOL(colo_requested, COLOInfo),
59 VMSTATE_END_OF_LIST()
60 },
61 };
62
colo_info_init(void)63 void colo_info_init(void)
64 {
65 vmstate_register(NULL, 0, &colo_state, &colo_info);
66 }
67
migration_incoming_enable_colo(void)68 bool migration_incoming_enable_colo(void)
69 {
70 return colo_info.colo_requested;
71 }
72
migration_incoming_exit_colo(void)73 void migration_incoming_exit_colo(void)
74 {
75 colo_info.colo_requested = false;
76 }
77