vl.c: remove outdated comment
[qemu/ar7.git] / replay / replay-snapshot.c
blob16bacc98bc2b05f6ee0330342dced33d08ddc08a
1 /*
2 * replay-snapshot.c
4 * Copyright (c) 2010-2016 Institute for System Programming
5 * of the Russian Academy of Sciences.
7 * This work is licensed under the terms of the GNU GPL, version 2 or later.
8 * See the COPYING file in the top-level directory.
12 #include "qemu/osdep.h"
13 #include "qapi/error.h"
14 #include "qemu-common.h"
15 #include "sysemu/replay.h"
16 #include "replay-internal.h"
17 #include "sysemu/sysemu.h"
18 #include "monitor/monitor.h"
19 #include "qapi/qmp/qstring.h"
20 #include "qemu/error-report.h"
21 #include "migration/vmstate.h"
22 #include "migration/snapshot.h"
24 static int replay_pre_save(void *opaque)
26 ReplayState *state = opaque;
27 state->file_offset = ftell(replay_file);
28 state->host_clock_last = qemu_clock_get_last(QEMU_CLOCK_HOST);
30 return 0;
33 static int replay_post_load(void *opaque, int version_id)
35 ReplayState *state = opaque;
36 if (replay_mode == REPLAY_MODE_PLAY) {
37 fseek(replay_file, state->file_offset, SEEK_SET);
38 qemu_clock_set_last(QEMU_CLOCK_HOST, state->host_clock_last);
39 /* If this was a vmstate, saved in recording mode,
40 we need to initialize replay data fields. */
41 replay_fetch_data_kind();
42 } else if (replay_mode == REPLAY_MODE_RECORD) {
43 /* This is only useful for loading the initial state.
44 Therefore reset all the counters. */
45 state->instructions_count = 0;
46 state->block_request_id = 0;
49 return 0;
52 static const VMStateDescription vmstate_replay = {
53 .name = "replay",
54 .version_id = 1,
55 .minimum_version_id = 1,
56 .pre_save = replay_pre_save,
57 .post_load = replay_post_load,
58 .fields = (VMStateField[]) {
59 VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
60 VMSTATE_UINT64(current_step, ReplayState),
61 VMSTATE_INT32(instructions_count, ReplayState),
62 VMSTATE_UINT32(data_kind, ReplayState),
63 VMSTATE_UINT32(has_unread_data, ReplayState),
64 VMSTATE_UINT64(file_offset, ReplayState),
65 VMSTATE_UINT64(block_request_id, ReplayState),
66 VMSTATE_UINT64(host_clock_last, ReplayState),
67 VMSTATE_INT32(read_event_kind, ReplayState),
68 VMSTATE_UINT64(read_event_id, ReplayState),
69 VMSTATE_INT32(read_event_checkpoint, ReplayState),
70 VMSTATE_END_OF_LIST()
74 void replay_vmstate_register(void)
76 vmstate_register(NULL, 0, &vmstate_replay, &replay_state);
79 void replay_vmstate_init(void)
81 Error *err = NULL;
83 if (replay_snapshot) {
84 if (replay_mode == REPLAY_MODE_RECORD) {
85 if (save_snapshot(replay_snapshot, &err) != 0) {
86 error_report_err(err);
87 error_report("Could not create snapshot for icount record");
88 exit(1);
90 } else if (replay_mode == REPLAY_MODE_PLAY) {
91 if (load_snapshot(replay_snapshot, &err) != 0) {
92 error_report_err(err);
93 error_report("Could not load snapshot for icount replay");
94 exit(1);
100 bool replay_can_snapshot(void)
102 return replay_mode == REPLAY_MODE_NONE
103 || !replay_has_events();