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 "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"
  23
  24 static int replay_pre_save(void *opaque)
  25 {
  26     ReplayState *state = opaque;
  27     state->file_offset = ftell(replay_file);
  28     state->host_clock_last = qemu_clock_get_last(QEMU_CLOCK_HOST);
  29
  30     return 0;
  31 }
  32
  33 static int replay_post_load(void *opaque, int version_id)
  34 {
  35     ReplayState *state = opaque;
  36     fseek(replay_file, state->file_offset, SEEK_SET);
  37     qemu_clock_set_last(QEMU_CLOCK_HOST, state->host_clock_last);
  38     /* If this was a vmstate, saved in recording mode,
  39        we need to initialize replay data fields. */
  40     replay_fetch_data_kind();
  41
  42     return 0;
  43 }
  44
  45 static const VMStateDescription vmstate_replay = {
  46     .name = "replay",
  47     .version_id = 1,
  48     .minimum_version_id = 1,
  49     .pre_save = replay_pre_save,
  50     .post_load = replay_post_load,
  51     .fields = (VMStateField[]) {
  52         VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
  53         VMSTATE_UINT64(current_step, ReplayState),
  54         VMSTATE_INT32(instructions_count, ReplayState),
  55         VMSTATE_UINT32(data_kind, ReplayState),
  56         VMSTATE_UINT32(has_unread_data, ReplayState),
  57         VMSTATE_UINT64(file_offset, ReplayState),
  58         VMSTATE_UINT64(block_request_id, ReplayState),
  59         VMSTATE_UINT64(host_clock_last, ReplayState),
  60         VMSTATE_INT32(read_event_kind, ReplayState),
  61         VMSTATE_UINT64(read_event_id, ReplayState),
  62         VMSTATE_INT32(read_event_checkpoint, ReplayState),
  63         VMSTATE_END_OF_LIST()
  64     },
  65 };
  66
  67 void replay_vmstate_register(void)
  68 {
  69     vmstate_register(NULL, 0, &vmstate_replay, &replay_state);
  70 }
  71
  72 void replay_vmstate_init(void)
  73 {
  74     Error *err = NULL;
  75
  76     if (replay_snapshot) {
  77         if (replay_mode == REPLAY_MODE_RECORD) {
  78             if (save_snapshot(replay_snapshot, &err) != 0) {
  79                 error_report_err(err);
  80                 error_report("Could not create snapshot for icount record");
  81                 exit(1);
  82             }
  83         } else if (replay_mode == REPLAY_MODE_PLAY) {
  84             if (load_snapshot(replay_snapshot, &err) != 0) {
  85                 error_report_err(err);
  86                 error_report("Could not load snapshot for icount replay");
  87                 exit(1);
  88             }
  89         }
  90     }
  91 }
  92
  93 bool replay_can_snapshot(void)
  94 {
  95     return replay_mode == REPLAY_MODE_NONE
  96         || !replay_has_events();
  97 }