nbd: Let server know when client gives up negotiation
[qemu/ar7.git] / migration / colo-comm.c
blob20b60ec3847981c39a0f2e4bebcdb7e4e6096aad
1 /*
2 * COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
3 * (a.k.a. Fault Tolerance or Continuous Replication)
5 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
6 * Copyright (c) 2016 FUJITSU LIMITED
7 * Copyright (c) 2016 Intel Corporation
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.
14 #include "qemu/osdep.h"
15 #include <migration/colo.h>
16 #include "trace.h"
18 typedef struct {
19 bool colo_requested;
20 } COLOInfo;
22 static COLOInfo colo_info;
24 COLOMode get_colo_mode(void)
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;
35 static void colo_info_pre_save(void *opaque)
37 COLOInfo *s = opaque;
39 s->colo_requested = migrate_colo_enabled();
42 static bool colo_info_need(void *opaque)
44 return migrate_colo_enabled();
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()
59 void colo_info_init(void)
61 vmstate_register(NULL, 0, &colo_state, &colo_info);
64 bool migration_incoming_enable_colo(void)
66 return colo_info.colo_requested;
69 void migration_incoming_exit_colo(void)
71 colo_info.colo_requested = false;