qemu/migration/colo-comm.c
Dr. David Alan Gilbert 44b1ff319c migration: pre_save return int
Modify the pre_save method on VMStateDescription to return an int
rather than void so that it potentially can fail.

Changed zillions of devices to make them return 0; the only
case I've made it return non-0 is hw/intc/s390_flic_kvm.c that already
had an error_report/return case.

Note: If you add an error exit in your pre_save you must emit
an error_report to say why.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20170925112917.21340-2-dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2017-09-27 11:35:59 +01:00

77 lines
1.6 KiB
C

/*
* 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;
}