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/*
* 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 "sysemu/replay.h"
#include "replay-internal.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;
if (replay_mode == REPLAY_MODE_PLAY) {
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();
} else if (replay_mode == REPLAY_MODE_RECORD) {
/* This is only useful for loading the initial state.
Therefore reset all the counters. */
state->instruction_count = 0;
state->block_request_id = 0;
}
return 0;
}
static const VMStateDescription vmstate_replay = {
.name = "replay",
.version_id = 2,
.minimum_version_id = 2,
.pre_save = replay_pre_save,
.post_load = replay_post_load,
.fields = (VMStateField[]) {
VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
VMSTATE_UINT64(current_icount, ReplayState),
VMSTATE_INT32(instruction_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_INT32(read_event_kind, ReplayState),
VMSTATE_UINT64(read_event_id, ReplayState),
VMSTATE_INT32(read_event_checkpoint, 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, true, &err)) {
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)) {
error_report_err(err);
error_report("Could not load snapshot for icount replay");
exit(1);
}
}
}
}
bool replay_can_snapshot(void)
{
return replay_mode == REPLAY_MODE_NONE
|| !replay_has_events();
}
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