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 "sysemu/sysemu.h" 17 #include "monitor/monitor.h" 18 #include "qapi/qmp/qstring.h" 19 #include "qemu/error-report.h" 20 #include "migration/vmstate.h" 21 #include "migration/snapshot.h" 22 23 static int replay_pre_save(void *opaque) 24 { 25 ReplayState *state = opaque; 26 state->file_offset = ftell(replay_file); 27 state->host_clock_last = qemu_clock_get_last(QEMU_CLOCK_HOST); 28 29 return 0; 30 } 31 32 static int replay_post_load(void *opaque, int version_id) 33 { 34 ReplayState *state = opaque; 35 if (replay_mode == REPLAY_MODE_PLAY) { 36 fseek(replay_file, state->file_offset, SEEK_SET); 37 qemu_clock_set_last(QEMU_CLOCK_HOST, state->host_clock_last); 38 /* If this was a vmstate, saved in recording mode, 39 we need to initialize replay data fields. */ 40 replay_fetch_data_kind(); 41 } else if (replay_mode == REPLAY_MODE_RECORD) { 42 /* This is only useful for loading the initial state. 43 Therefore reset all the counters. */ 44 state->instructions_count = 0; 45 state->block_request_id = 0; 46 } 47 48 return 0; 49 } 50 51 static const VMStateDescription vmstate_replay = { 52 .name = "replay", 53 .version_id = 1, 54 .minimum_version_id = 1, 55 .pre_save = replay_pre_save, 56 .post_load = replay_post_load, 57 .fields = (VMStateField[]) { 58 VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT), 59 VMSTATE_UINT64(current_step, ReplayState), 60 VMSTATE_INT32(instructions_count, ReplayState), 61 VMSTATE_UINT32(data_kind, ReplayState), 62 VMSTATE_UINT32(has_unread_data, ReplayState), 63 VMSTATE_UINT64(file_offset, ReplayState), 64 VMSTATE_UINT64(block_request_id, ReplayState), 65 VMSTATE_UINT64(host_clock_last, ReplayState), 66 VMSTATE_INT32(read_event_kind, ReplayState), 67 VMSTATE_UINT64(read_event_id, ReplayState), 68 VMSTATE_INT32(read_event_checkpoint, ReplayState), 69 VMSTATE_END_OF_LIST() 70 }, 71 }; 72 73 void replay_vmstate_register(void) 74 { 75 vmstate_register(NULL, 0, &vmstate_replay, &replay_state); 76 } 77 78 void replay_vmstate_init(void) 79 { 80 Error *err = NULL; 81 82 if (replay_snapshot) { 83 if (replay_mode == REPLAY_MODE_RECORD) { 84 if (save_snapshot(replay_snapshot, &err) != 0) { 85 error_report_err(err); 86 error_report("Could not create snapshot for icount record"); 87 exit(1); 88 } 89 } else if (replay_mode == REPLAY_MODE_PLAY) { 90 if (load_snapshot(replay_snapshot, &err) != 0) { 91 error_report_err(err); 92 error_report("Could not load snapshot for icount replay"); 93 exit(1); 94 } 95 } 96 } 97 } 98 99 bool replay_can_snapshot(void) 100 { 101 return replay_mode == REPLAY_MODE_NONE 102 || !replay_has_events(); 103 } 104