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 state->host_clock_last = qemu_clock_get_last(QEMU_CLOCK_HOST); 29 30 return 0; 31 } 32 33 static 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 52 static 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 74 void replay_vmstate_register(void) 75 { 76 vmstate_register(NULL, 0, &vmstate_replay, &replay_state); 77 } 78 79 void 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 } 99 100 bool replay_can_snapshot(void) 101 { 102 return replay_mode == REPLAY_MODE_NONE 103 || !replay_has_events(); 104 } 105