Merge remote-tracking branch 'remotes/philmd/tags/sdmmc-20210803' into staging
[qemu.git] / replay / replay-snapshot.c
1 /*
2 * replay-snapshot.c
3 *
4 * Copyright (c) 2010-2016 Institute for System Programming
5 * of the Russian Academy of Sciences.
6 *
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.
9 *
10 */
11
12 #include "qemu/osdep.h"
13 #include "qapi/error.h"
14 #include "sysemu/replay.h"
15 #include "replay-internal.h"
16 #include "monitor/monitor.h"
17 #include "qapi/qmp/qstring.h"
18 #include "qemu/error-report.h"
19 #include "migration/vmstate.h"
20 #include "migration/snapshot.h"
21
22 static int replay_pre_save(void *opaque)
23 {
24 ReplayState *state = opaque;
25 state->file_offset = ftell(replay_file);
26
27 return 0;
28 }
29
30 static int replay_post_load(void *opaque, int version_id)
31 {
32 ReplayState *state = opaque;
33 if (replay_mode == REPLAY_MODE_PLAY) {
34 fseek(replay_file, state->file_offset, SEEK_SET);
35 /* If this was a vmstate, saved in recording mode,
36 we need to initialize replay data fields. */
37 replay_fetch_data_kind();
38 } else if (replay_mode == REPLAY_MODE_RECORD) {
39 /* This is only useful for loading the initial state.
40 Therefore reset all the counters. */
41 state->instruction_count = 0;
42 state->block_request_id = 0;
43 }
44
45 return 0;
46 }
47
48 static const VMStateDescription vmstate_replay = {
49 .name = "replay",
50 .version_id = 2,
51 .minimum_version_id = 2,
52 .pre_save = replay_pre_save,
53 .post_load = replay_post_load,
54 .fields = (VMStateField[]) {
55 VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
56 VMSTATE_UINT64(current_icount, ReplayState),
57 VMSTATE_INT32(instruction_count, ReplayState),
58 VMSTATE_UINT32(data_kind, ReplayState),
59 VMSTATE_UINT32(has_unread_data, ReplayState),
60 VMSTATE_UINT64(file_offset, ReplayState),
61 VMSTATE_UINT64(block_request_id, ReplayState),
62 VMSTATE_INT32(read_event_kind, ReplayState),
63 VMSTATE_UINT64(read_event_id, ReplayState),
64 VMSTATE_INT32(read_event_checkpoint, ReplayState),
65 VMSTATE_END_OF_LIST()
66 },
67 };
68
69 void replay_vmstate_register(void)
70 {
71 vmstate_register(NULL, 0, &vmstate_replay, &replay_state);
72 }
73
74 void replay_vmstate_init(void)
75 {
76 Error *err = NULL;
77
78 if (replay_snapshot) {
79 if (replay_mode == REPLAY_MODE_RECORD) {
80 if (!save_snapshot(replay_snapshot,
81 true, NULL, false, NULL, &err)) {
82 error_report_err(err);
83 error_report("Could not create snapshot for icount record");
84 exit(1);
85 }
86 } else if (replay_mode == REPLAY_MODE_PLAY) {
87 if (!load_snapshot(replay_snapshot, NULL, false, NULL, &err)) {
88 error_report_err(err);
89 error_report("Could not load snapshot for icount replay");
90 exit(1);
91 }
92 }
93 }
94 }
95
96 bool replay_can_snapshot(void)
97 {
98 return replay_mode == REPLAY_MODE_NONE
99 || !replay_has_events();
100 }