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