qemu/replay/replay-snapshot.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

86 lines
2.4 KiB
C

/*
* replay-snapshot.c
*
* Copyright (c) 2010-2016 Institute for System Programming
* of the Russian Academy of Sciences.
*
* 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 "qapi/error.h"
#include "qemu-common.h"
#include "sysemu/replay.h"
#include "replay-internal.h"
#include "sysemu/sysemu.h"
#include "monitor/monitor.h"
#include "qapi/qmp/qstring.h"
#include "qemu/error-report.h"
#include "migration/vmstate.h"
#include "migration/snapshot.h"
static int replay_pre_save(void *opaque)
{
ReplayState *state = opaque;
state->file_offset = ftell(replay_file);
return 0;
}
static int replay_post_load(void *opaque, int version_id)
{
ReplayState *state = opaque;
fseek(replay_file, state->file_offset, SEEK_SET);
/* If this was a vmstate, saved in recording mode,
we need to initialize replay data fields. */
replay_fetch_data_kind();
return 0;
}
static const VMStateDescription vmstate_replay = {
.name = "replay",
.version_id = 1,
.minimum_version_id = 1,
.pre_save = replay_pre_save,
.post_load = replay_post_load,
.fields = (VMStateField[]) {
VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
VMSTATE_UINT64(current_step, ReplayState),
VMSTATE_INT32(instructions_count, ReplayState),
VMSTATE_UINT32(data_kind, ReplayState),
VMSTATE_UINT32(has_unread_data, ReplayState),
VMSTATE_UINT64(file_offset, ReplayState),
VMSTATE_UINT64(block_request_id, ReplayState),
VMSTATE_END_OF_LIST()
},
};
void replay_vmstate_register(void)
{
vmstate_register(NULL, 0, &vmstate_replay, &replay_state);
}
void replay_vmstate_init(void)
{
Error *err = NULL;
if (replay_snapshot) {
if (replay_mode == REPLAY_MODE_RECORD) {
if (save_snapshot(replay_snapshot, &err) != 0) {
error_report_err(err);
error_report("Could not create snapshot for icount record");
exit(1);
}
} else if (replay_mode == REPLAY_MODE_PLAY) {
if (load_snapshot(replay_snapshot, &err) != 0) {
error_report_err(err);
error_report("Could not load snapshot for icount replay");
exit(1);
}
}
}
}