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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 | #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 | #include "qemu/error-report.h" | |
19 | #include "trace.h" | |
20 | ||
21 | static QEMUBH *failover_bh; | |
22 | static FailoverStatus failover_state; | |
23 | ||
24 | static void colo_failover_bh(void *opaque) | |
25 | { | |
26 | int old_state; | |
27 | ||
28 | qemu_bh_delete(failover_bh); | |
29 | failover_bh = NULL; | |
30 | ||
31 | old_state = failover_set_state(FAILOVER_STATUS_REQUIRE, | |
32 | FAILOVER_STATUS_ACTIVE); | |
33 | if (old_state != FAILOVER_STATUS_REQUIRE) { | |
34 | error_report("Unknown error for failover, old_state = %s", | |
35 | FailoverStatus_lookup[old_state]); | |
36 | return; | |
37 | } | |
38 | ||
39 | colo_do_failover(NULL); | |
40 | } | |
41 | ||
42 | void failover_request_active(Error **errp) | |
43 | { | |
44 | if (failover_set_state(FAILOVER_STATUS_NONE, | |
45 | FAILOVER_STATUS_REQUIRE) != FAILOVER_STATUS_NONE) { | |
46 | error_setg(errp, "COLO failover is already actived"); | |
47 | return; | |
48 | } | |
49 | failover_bh = qemu_bh_new(colo_failover_bh, NULL); | |
50 | qemu_bh_schedule(failover_bh); | |
51 | } | |
52 | ||
53 | void failover_init_state(void) | |
54 | { | |
55 | failover_state = FAILOVER_STATUS_NONE; | |
56 | } | |
57 | ||
58 | FailoverStatus failover_set_state(FailoverStatus old_state, | |
59 | FailoverStatus new_state) | |
60 | { | |
61 | FailoverStatus old; | |
62 | ||
63 | old = atomic_cmpxchg(&failover_state, old_state, new_state); | |
64 | if (old == old_state) { | |
65 | trace_colo_failover_set_state(FailoverStatus_lookup[new_state]); | |
66 | } | |
67 | return old; | |
68 | } | |
69 | ||
70 | FailoverStatus failover_get_state(void) | |
71 | { | |
72 | return atomic_read(&failover_state); | |
73 | } | |
74 | ||
75 | void qmp_x_colo_lost_heartbeat(Error **errp) | |
76 | { | |
77 | if (get_colo_mode() == COLO_MODE_UNKNOWN) { | |
78 | error_setg(errp, QERR_FEATURE_DISABLED, "colo"); | |
79 | return; | |
80 | } | |
81 | ||
82 | failover_request_active(errp); | |
83 | } |