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 } 86