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We leave users to choose whatever heartbeat solution they want, if the heartbeat is lost, or other errors they detect, they can use experimental command 'x_colo_lost_heartbeat' to tell COLO to do failover, COLO will do operations accordingly. For example, if the command is sent to the Primary side, the Primary side will exit COLO mode, does cleanup work, and then, PVM will take over the service work. If sent to the Secondary side, the Secondary side will run failover work, then takes over PVM's service work. Cc: Luiz Capitulino <lcapitulino@redhat.com> Cc: Eric Blake <eblake@redhat.com> Cc: Markus Armbruster <armbru@redhat.com> Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Amit Shah <amit@amitshah.net>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/*
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* COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
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* (a.k.a. Fault Tolerance or Continuous Replication)
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*
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* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
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* Copyright (c) 2016 FUJITSU LIMITED
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* Copyright (c) 2016 Intel Corporation
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include <migration/colo.h>
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#include "trace.h"
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typedef struct {
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bool colo_requested;
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} COLOInfo;
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static COLOInfo colo_info;
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COLOMode get_colo_mode(void)
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{
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if (migration_in_colo_state()) {
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return COLO_MODE_PRIMARY;
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} else if (migration_incoming_in_colo_state()) {
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return COLO_MODE_SECONDARY;
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} else {
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return COLO_MODE_UNKNOWN;
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}
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}
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static void colo_info_pre_save(void *opaque)
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{
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COLOInfo *s = opaque;
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s->colo_requested = migrate_colo_enabled();
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}
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static bool colo_info_need(void *opaque)
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{
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return migrate_colo_enabled();
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}
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static const VMStateDescription colo_state = {
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.name = "COLOState",
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.version_id = 1,
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.minimum_version_id = 1,
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.pre_save = colo_info_pre_save,
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.needed = colo_info_need,
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.fields = (VMStateField[]) {
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VMSTATE_BOOL(colo_requested, COLOInfo),
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VMSTATE_END_OF_LIST()
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},
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};
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void colo_info_init(void)
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{
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vmstate_register(NULL, 0, &colo_state, &colo_info);
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}
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bool migration_incoming_enable_colo(void)
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{
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return colo_info.colo_requested;
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}
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void migration_incoming_exit_colo(void)
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{
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colo_info.colo_requested = false;
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}
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