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