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/*
* COarse-grain LOck-stepping Virtual Machines for Non-stop Service (COLO)
* (a.k.a. Fault Tolerance or Continuous Replication)
*
* Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
* Copyright (c) 2016 FUJITSU LIMITED
* Copyright (c) 2016 Intel Corporation
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include "migration.h"
#include "migration/colo.h"
#include "migration/vmstate.h"
#include "trace.h"
typedef struct {
bool colo_requested;
} COLOInfo;
static COLOInfo colo_info;
COLOMode get_colo_mode(void)
{
if (migration_in_colo_state()) {
return COLO_MODE_PRIMARY;
} else if (migration_incoming_in_colo_state()) {
return COLO_MODE_SECONDARY;
} else {
return COLO_MODE_UNKNOWN;
}
}
static int colo_info_pre_save(void *opaque)
{
COLOInfo *s = opaque;
s->colo_requested = migrate_colo_enabled();
return 0;
}
static bool colo_info_need(void *opaque)
{
return migrate_colo_enabled();
}
static const VMStateDescription colo_state = {
.name = "COLOState",
.version_id = 1,
.minimum_version_id = 1,
.pre_save = colo_info_pre_save,
.needed = colo_info_need,
.fields = (VMStateField[]) {
VMSTATE_BOOL(colo_requested, COLOInfo),
VMSTATE_END_OF_LIST()
},
};
void colo_info_init(void)
{
vmstate_register(NULL, 0, &colo_state, &colo_info);
}
bool migration_incoming_enable_colo(void)
{
return colo_info.colo_requested;
}
void migration_incoming_exit_colo(void)
{
colo_info.colo_requested = false;
}
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