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 "sysemu/replay.h" 15 #include "replay-internal.h" 16 #include "monitor/monitor.h" 17 #include "qapi/qmp/qstring.h" 18 #include "qemu/error-report.h" 19 #include "migration/vmstate.h" 20 #include "migration/snapshot.h" 21 22 static int replay_pre_save(void *opaque) 23 { 24 ReplayState *state = opaque; 25 state->file_offset = ftell(replay_file); 26 state->host_clock_last = qemu_clock_get_last(QEMU_CLOCK_HOST); 27 28 return 0; 29 } 30 31 static int replay_post_load(void *opaque, int version_id) 32 { 33 ReplayState *state = opaque; 34 if (replay_mode == REPLAY_MODE_PLAY) { 35 fseek(replay_file, state->file_offset, SEEK_SET); 36 qemu_clock_set_last(QEMU_CLOCK_HOST, state->host_clock_last); 37 /* If this was a vmstate, saved in recording mode, 38 we need to initialize replay data fields. */ 39 replay_fetch_data_kind(); 40 } else if (replay_mode == REPLAY_MODE_RECORD) { 41 /* This is only useful for loading the initial state. 42 Therefore reset all the counters. */ 43 state->instructions_count = 0; 44 state->block_request_id = 0; 45 } 46 47 return 0; 48 } 49 50 static const VMStateDescription vmstate_replay = { 51 .name = "replay", 52 .version_id = 1, 53 .minimum_version_id = 1, 54 .pre_save = replay_pre_save, 55 .post_load = replay_post_load, 56 .fields = (VMStateField[]) { 57 VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT), 58 VMSTATE_UINT64(current_step, ReplayState), 59 VMSTATE_INT32(instructions_count, ReplayState), 60 VMSTATE_UINT32(data_kind, ReplayState), 61 VMSTATE_UINT32(has_unread_data, ReplayState), 62 VMSTATE_UINT64(file_offset, ReplayState), 63 VMSTATE_UINT64(block_request_id, ReplayState), 64 VMSTATE_UINT64(host_clock_last, ReplayState), 65 VMSTATE_INT32(read_event_kind, ReplayState), 66 VMSTATE_UINT64(read_event_id, ReplayState), 67 VMSTATE_INT32(read_event_checkpoint, ReplayState), 68 VMSTATE_END_OF_LIST() 69 }, 70 }; 71 72 void replay_vmstate_register(void) 73 { 74 vmstate_register(NULL, 0, &vmstate_replay, &replay_state); 75 } 76 77 void replay_vmstate_init(void) 78 { 79 Error *err = NULL; 80 81 if (replay_snapshot) { 82 if (replay_mode == REPLAY_MODE_RECORD) { 83 if (save_snapshot(replay_snapshot, &err) != 0) { 84 error_report_err(err); 85 error_report("Could not create snapshot for icount record"); 86 exit(1); 87 } 88 } else if (replay_mode == REPLAY_MODE_PLAY) { 89 if (load_snapshot(replay_snapshot, &err) != 0) { 90 error_report_err(err); 91 error_report("Could not load snapshot for icount replay"); 92 exit(1); 93 } 94 } 95 } 96 } 97 98 bool replay_can_snapshot(void) 99 { 100 return replay_mode == REPLAY_MODE_NONE 101 || !replay_has_events(); 102 } 103