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