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 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 42 return 0; 43 } 44 45 static const VMStateDescription vmstate_replay = { 46 .name = "replay", 47 .version_id = 1, 48 .minimum_version_id = 1, 49 .pre_save = replay_pre_save, 50 .post_load = replay_post_load, 51 .fields = (VMStateField[]) { 52 VMSTATE_INT64_ARRAY(cached_clock, ReplayState, REPLAY_CLOCK_COUNT), 53 VMSTATE_UINT64(current_step, ReplayState), 54 VMSTATE_INT32(instructions_count, ReplayState), 55 VMSTATE_UINT32(data_kind, ReplayState), 56 VMSTATE_UINT32(has_unread_data, ReplayState), 57 VMSTATE_UINT64(file_offset, ReplayState), 58 VMSTATE_UINT64(block_request_id, ReplayState), 59 VMSTATE_UINT64(host_clock_last, ReplayState), 60 VMSTATE_INT32(read_event_kind, ReplayState), 61 VMSTATE_UINT64(read_event_id, ReplayState), 62 VMSTATE_INT32(read_event_checkpoint, ReplayState), 63 VMSTATE_END_OF_LIST() 64 }, 65 }; 66 67 void replay_vmstate_register(void) 68 { 69 vmstate_register(NULL, 0, &vmstate_replay, &replay_state); 70 } 71 72 void replay_vmstate_init(void) 73 { 74 Error *err = NULL; 75 76 if (replay_snapshot) { 77 if (replay_mode == REPLAY_MODE_RECORD) { 78 if (save_snapshot(replay_snapshot, &err) != 0) { 79 error_report_err(err); 80 error_report("Could not create snapshot for icount record"); 81 exit(1); 82 } 83 } else if (replay_mode == REPLAY_MODE_PLAY) { 84 if (load_snapshot(replay_snapshot, &err) != 0) { 85 error_report_err(err); 86 error_report("Could not load snapshot for icount replay"); 87 exit(1); 88 } 89 } 90 } 91 } 92 93 bool replay_can_snapshot(void) 94 { 95 return replay_mode == REPLAY_MODE_NONE 96 || !replay_has_events(); 97 } 98