9c2037d0a4
This patch implements initial vmstate creation or loading at the start of record/replay. It is needed for rewinding the execution in the replay mode. v4 changes: - snapshots are not created by default anymore v3 changes: - added rrsnapshot option Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru> Message-Id: <20170124071746.4572.61449.stgit@PASHA-ISP> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/*
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* replay-snapshot.c
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*
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* Copyright (c) 2010-2016 Institute for System Programming
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* of the Russian Academy of Sciences.
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* 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 "qapi/error.h"
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#include "qemu-common.h"
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#include "sysemu/replay.h"
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#include "replay-internal.h"
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#include "sysemu/sysemu.h"
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#include "monitor/monitor.h"
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#include "qapi/qmp/qstring.h"
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#include "qemu/error-report.h"
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#include "migration/vmstate.h"
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static void replay_pre_save(void *opaque)
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{
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ReplayState *state = opaque;
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state->file_offset = ftell(replay_file);
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}
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static int replay_post_load(void *opaque, int version_id)
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{
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ReplayState *state = opaque;
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fseek(replay_file, state->file_offset, SEEK_SET);
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/* If this was a vmstate, saved in recording mode,
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we need to initialize replay data fields. */
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replay_fetch_data_kind();
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return 0;
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}
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static const VMStateDescription vmstate_replay = {
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.name = "replay",
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.version_id = 1,
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.minimum_version_id = 1,
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.pre_save = replay_pre_save,
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.post_load = replay_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
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VMSTATE_UINT64(current_step, ReplayState),
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VMSTATE_INT32(instructions_count, ReplayState),
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VMSTATE_UINT32(data_kind, ReplayState),
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VMSTATE_UINT32(has_unread_data, ReplayState),
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VMSTATE_UINT64(file_offset, ReplayState),
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VMSTATE_UINT64(block_request_id, ReplayState),
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VMSTATE_END_OF_LIST()
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},
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};
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void replay_vmstate_register(void)
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{
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vmstate_register(NULL, 0, &vmstate_replay, &replay_state);
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}
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void replay_vmstate_init(void)
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{
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if (replay_snapshot) {
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if (replay_mode == REPLAY_MODE_RECORD) {
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if (save_vmstate(cur_mon, replay_snapshot) != 0) {
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error_report("Could not create snapshot for icount record");
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exit(1);
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}
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} else if (replay_mode == REPLAY_MODE_PLAY) {
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if (load_vmstate(replay_snapshot) != 0) {
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error_report("Could not load snapshot for icount replay");
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exit(1);
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}
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}
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}
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}
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