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
  23 static void replay_pre_save(void *opaque)
  24 {
  25     ReplayState *state = opaque;
  26     state->file_offset = ftell(replay_file);
  27 }
  28
  29 static int replay_post_load(void *opaque, int version_id)
  30 {
  31     ReplayState *state = opaque;
  32     fseek(replay_file, state->file_offset, SEEK_SET);
  33     /* If this was a vmstate, saved in recording mode,
  34        we need to initialize replay data fields. */
  35     replay_fetch_data_kind();
  36
  37     return 0;
  38 }
  39
  40 static const VMStateDescription vmstate_replay = {
  41     .name = "replay",
  42     .version_id = 1,
  43     .minimum_version_id = 1,
  44     .pre_save = replay_pre_save,
  45     .post_load = replay_post_load,
  46     .fields = (VMStateField[]) {
  47         VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT),
  48         VMSTATE_UINT64(current_step, ReplayState),
  49         VMSTATE_INT32(instructions_count, ReplayState),
  50         VMSTATE_UINT32(data_kind, ReplayState),
  51         VMSTATE_UINT32(has_unread_data, ReplayState),
  52         VMSTATE_UINT64(file_offset, ReplayState),
  53         VMSTATE_UINT64(block_request_id, ReplayState),
  54         VMSTATE_END_OF_LIST()
  55     },
  56 };
  57
  58 void replay_vmstate_register(void)
  59 {
  60     vmstate_register(NULL, 0, &vmstate_replay, &replay_state);
  61 }
  62
  63 void replay_vmstate_init(void)
  64 {
  65     if (replay_snapshot) {
  66         if (replay_mode == REPLAY_MODE_RECORD) {
  67             if (save_vmstate(cur_mon, replay_snapshot) != 0) {
  68                 error_report("Could not create snapshot for icount record");
  69                 exit(1);
  70             }
  71         } else if (replay_mode == REPLAY_MODE_PLAY) {
  72             if (load_vmstate(replay_snapshot) != 0) {
  73                 error_report("Could not load snapshot for icount replay");
  74                 exit(1);
  75             }
  76         }
  77     }
  78 }