LXR qemu/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
  24static 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
  33static int replay_post_load(void *opaque, int version_id)
  34{
  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;
  47    }
  48
  49    return 0;
  50}
  51
  52static 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()
  71    },
  72};
  73
  74void replay_vmstate_register(void)
  75{
  76    vmstate_register(NULL, 0, &vmstate_replay, &replay_state);
  77}
  78
  79void replay_vmstate_init(void)
  80{
  81    Error *err = NULL;
  82
  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);
  89            }
  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);
  95            }
  96        }
  97    }
  98}
  99
 100bool replay_can_snapshot(void)
 101{
 102    return replay_mode == REPLAY_MODE_NONE
 103        || !replay_has_events();
 104}
 105