aboutsummaryrefslogtreecommitdiff
path: root/tools/perf/builtin-kvm.c
blob: fc1cffb1b7a28c9b0d9856770530a0e8b3bf9606 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
#include "builtin.h"
#include "perf.h"

#include "util/evsel.h"
#include "util/evlist.h"
#include "util/util.h"
#include "util/cache.h"
#include "util/symbol.h"
#include "util/thread.h"
#include "util/header.h"
#include "util/session.h"
#include "util/intlist.h"
#include "util/parse-options.h"
#include "util/trace-event.h"
#include "util/debug.h"
#include <api/fs/debugfs.h>
#include "util/tool.h"
#include "util/stat.h"
#include "util/top.h"
#include "util/data.h"
#include "util/ordered-events.h"

#include <sys/prctl.h>
#ifdef HAVE_TIMERFD_SUPPORT
#include <sys/timerfd.h>
#endif

#include <termios.h>
#include <semaphore.h>
#include <pthread.h>
#include <math.h>

#ifdef HAVE_KVM_STAT_SUPPORT
#include <asm/kvm_perf.h>
#include "util/kvm-stat.h"

void exit_event_get_key(struct perf_evsel *evsel,
			struct perf_sample *sample,
			struct event_key *key)
{
	key->info = 0;
	key->key = perf_evsel__intval(evsel, sample, KVM_EXIT_REASON);
}

bool kvm_exit_event(struct perf_evsel *evsel)
{
	return !strcmp(evsel->name, KVM_EXIT_TRACE);
}

bool exit_event_begin(struct perf_evsel *evsel,
		      struct perf_sample *sample, struct event_key *key)
{
	if (kvm_exit_event(evsel)) {
		exit_event_get_key(evsel, sample, key);
		return true;
	}

	return false;
}

bool kvm_entry_event(struct perf_evsel *evsel)
{
	return !strcmp(evsel->name, KVM_ENTRY_TRACE);
}

bool exit_event_end(struct perf_evsel *evsel,
		    struct perf_sample *sample __maybe_unused,
		    struct event_key *key __maybe_unused)
{
	return kvm_entry_event(evsel);
}

static const char *get_exit_reason(struct perf_kvm_stat *kvm,
				   struct exit_reasons_table *tbl,
				   u64 exit_code)
{
	while (tbl->reason != NULL) {
		if (tbl->exit_code == exit_code)
			return tbl->reason;
		tbl++;
	}

	pr_err("unknown kvm exit code:%lld on %s\n",
		(unsigned long long)exit_code, kvm->exit_reasons_isa);
	return "UNKNOWN";
}

void exit_event_decode_key(struct perf_kvm_stat *kvm,
			   struct event_key *key,
			   char *decode)
{
	const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
						  key->key);

	scnprintf(decode, DECODE_STR_LEN, "%s", exit_reason);
}

static bool register_kvm_events_ops(struct perf_kvm_stat *kvm)
{
	struct kvm_reg_events_ops *events_ops = kvm_reg_events_ops;

	for (events_ops = kvm_reg_events_ops; events_ops->name; events_ops++) {
		if (!strcmp(events_ops->name, kvm->report_event)) {
			kvm->events_ops = events_ops->ops;
			return true;
		}
	}

	return false;
}

struct vcpu_event_record {
	int vcpu_id;
	u64 start_time;
	struct kvm_event *last_event;
};


static void init_kvm_event_record(struct perf_kvm_stat *kvm)
{
	unsigned int i;

	for (i = 0; i < EVENTS_CACHE_SIZE; i++)
		INIT_LIST_HEAD(&kvm->kvm_events_cache[i]);
}

#ifdef HAVE_TIMERFD_SUPPORT
static void clear_events_cache_stats(struct list_head *kvm_events_cache)
{
	struct list_head *head;
	struct kvm_event *event;
	unsigned int i;
	int j;

	for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
		head = &kvm_events_cache[i];
		list_for_each_entry(event, head, hash_entry) {
			/* reset stats for event */
			event->total.time = 0;
			init_stats(&event->total.stats);

			for (j = 0; j < event->max_vcpu; ++j) {
				event->vcpu[j].time = 0;
				init_stats(&event->vcpu[j].stats);
			}
		}
	}
}
#endif

static int kvm_events_hash_fn(u64 key)
{
	return key & (EVENTS_CACHE_SIZE - 1);
}

static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
{
	int old_max_vcpu = event->max_vcpu;
	void *prev;

	if (vcpu_id < event->max_vcpu)
		return true;

	while (event->max_vcpu <= vcpu_id)
		event->max_vcpu += DEFAULT_VCPU_NUM;

	prev = event->vcpu;
	event->vcpu = realloc(event->vcpu,
			      event->max_vcpu * sizeof(*event->vcpu));
	if (!event->vcpu) {
		free(prev);
		pr_err("Not enough memory\n");
		return false;
	}

	memset(event->vcpu + old_max_vcpu, 0,
	       (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
	return true;
}

static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
{
	struct kvm_event *event;

	event = zalloc(sizeof(*event));
	if (!event) {
		pr_err("Not enough memory\n");
		return NULL;
	}

	event->key = *key;
	init_stats(&event->total.stats);
	return event;
}

static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm,
					       struct event_key *key)
{
	struct kvm_event *event;
	struct list_head *head;

	BUG_ON(key->key == INVALID_KEY);

	head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)];
	list_for_each_entry(event, head, hash_entry) {
		if (event->key.key == key->key && event->key.info == key->info)
			return event;
	}

	event = kvm_alloc_init_event(key);
	if (!event)
		return NULL;

	list_add(&event->hash_entry, head);
	return event;
}

static bool handle_begin_event(struct perf_kvm_stat *kvm,
			       struct vcpu_event_record *vcpu_record,
			       struct event_key *key, u64 timestamp)
{
	struct kvm_event *event = NULL;

	if (key->key != INVALID_KEY)
		event = find_create_kvm_event(kvm, key);

	vcpu_record->last_event = event;
	vcpu_record->start_time = timestamp;
	return true;
}

static void
kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff)
{
	kvm_stats->time += time_diff;
	update_stats(&kvm_stats->stats, time_diff);
}

static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
{
	struct kvm_event_stats *kvm_stats = &event->total;

	if (vcpu_id != -1)
		kvm_stats = &event->vcpu[vcpu_id];

	return rel_stddev_stats(stddev_stats(&kvm_stats->stats),
				avg_stats(&kvm_stats->stats));
}

static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
			     u64 time_diff)
{
	if (vcpu_id == -1) {
		kvm_update_event_stats(&event->total, time_diff);
		return true;
	}

	if (!kvm_event_expand(event, vcpu_id))
		return false;

	kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
	return true;
}

static bool is_child_event(struct perf_kvm_stat *kvm,
			   struct perf_evsel *evsel,
			   struct perf_sample *sample,
			   struct event_key *key)
{
	struct child_event_ops *child_ops;

	child_ops = kvm->events_ops->child_ops;

	if (!child_ops)
		return false;

	for (; child_ops->name; child_ops++) {
		if (!strcmp(evsel->name, child_ops->name)) {
			child_ops->get_key(evsel, sample, key);
			return true;
		}
	}

	return false;
}

static bool handle_child_event(struct perf_kvm_stat *kvm,
			       struct vcpu_event_record *vcpu_record,
			       struct event_key *key,
			       struct perf_sample *sample __maybe_unused)
{
	struct kvm_event *event = NULL;

	if (key->key != INVALID_KEY)
		event = find_create_kvm_event(kvm, key);

	vcpu_record->last_event = event;

	return true;
}

static bool skip_event(const char *event)
{
	const char * const *skip_events;

	for (skip_events = kvm_skip_events; *skip_events; skip_events++)
		if (!strcmp(event, *skip_events))
			return true;

	return false;
}

static bool handle_end_event(struct perf_kvm_stat *kvm,
			     struct vcpu_event_record *vcpu_record,
			     struct event_key *key,
			     struct perf_sample *sample)
{
	struct kvm_event *event;
	u64 time_begin, time_diff;
	int vcpu;

	if (kvm->trace_vcpu == -1)
		vcpu = -1;
	else
		vcpu = vcpu_record->vcpu_id;

	event = vcpu_record->last_event;
	time_begin = vcpu_record->start_time;

	/* The begin event is not caught. */
	if (!time_begin)
		return true;

	/*
	 * In some case, the 'begin event' only records the start timestamp,
	 * the actual event is recognized in the 'end event' (e.g. mmio-event).
	 */

	/* Both begin and end events did not get the key. */
	if (!event && key->key == INVALID_KEY)
		return true;

	if (!event)
		event = find_create_kvm_event(kvm, key);

	if (!event)
		return false;

	vcpu_record->last_event = NULL;
	vcpu_record->start_time = 0;

	/* seems to happen once in a while during live mode */
	if (sample->time < time_begin) {
		pr_debug("End time before begin time; skipping event.\n");
		return true;
	}

	time_diff = sample->time - time_begin;

	if (kvm->duration && time_diff > kvm->duration) {
		char decode[DECODE_STR_LEN];

		kvm->events_ops->decode_key(kvm, &event->key, decode);
		if (!skip_event(decode)) {
			pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
				 sample->time, sample->pid, vcpu_record->vcpu_id,
				 decode, time_diff/1000);
		}
	}

	return update_kvm_event(event, vcpu, time_diff);
}

static
struct vcpu_event_record *per_vcpu_record(struct thread *thread,
					  struct perf_evsel *evsel,
					  struct perf_sample *sample)
{
	/* Only kvm_entry records vcpu id. */
	if (!thread__priv(thread) && kvm_entry_event(evsel)) {
		struct vcpu_event_record *vcpu_record;

		vcpu_record = zalloc(sizeof(*vcpu_record));
		if (!vcpu_record) {
			pr_err("%s: Not enough memory\n", __func__);
			return NULL;
		}

		vcpu_record->vcpu_id = perf_evsel__intval(evsel, sample, VCPU_ID);
		thread__set_priv(thread, vcpu_record);
	}

	return thread__priv(thread);
}

static bool handle_kvm_event(struct perf_kvm_stat *kvm,
			     struct thread *thread,
			     struct perf_evsel *evsel,
			     struct perf_sample *sample)
{
	struct vcpu_event_record *vcpu_record;
	struct event_key key = { .key = INVALID_KEY,
				 .exit_reasons = kvm->exit_reasons };

	vcpu_record = per_vcpu_record(thread, evsel, sample);
	if (!vcpu_record)
		return true;

	/* only process events for vcpus user cares about */
	if ((kvm->trace_vcpu != -1) &&
	    (kvm->trace_vcpu != vcpu_record->vcpu_id))
		return true;

	if (kvm->events_ops->is_begin_event(evsel, sample, &key))
		return handle_begin_event(kvm, vcpu_record, &key, sample->time);

	if (is_child_event(kvm, evsel, sample, &key))
		return handle_child_event(kvm, vcpu_record, &key, sample);

	if (kvm->events_ops->is_end_event(evsel, sample, &key))
		return handle_end_event(kvm, vcpu_record, &key, sample);

	return true;
}

#define GET_EVENT_KEY(func, field)					\
static u64 get_event_ ##func(struct kvm_event *event, int vcpu)		\
{									\
	if (vcpu == -1)							\
		return event->total.field;				\
									\
	if (vcpu >= event->max_vcpu)					\
		return 0;						\
									\
	return event->vcpu[vcpu].field;					\
}

#define COMPARE_EVENT_KEY(func, field)					\
GET_EVENT_KEY(func, field)						\
static int compare_kvm_event_ ## func(struct kvm_event *one,		\
					struct kvm_event *two, int vcpu)\
{									\
	return get_event_ ##func(one, vcpu) >				\
				get_event_ ##func(two, vcpu);		\
}

GET_EVENT_KEY(time, time);
COMPARE_EVENT_KEY(count, stats.n);
COMPARE_EVENT_KEY(mean, stats.mean);
GET_EVENT_KEY(max, stats.max);
GET_EVENT_KEY(min, stats.min);

#define DEF_SORT_NAME_KEY(name, compare_key)				\
	{ #name, compare_kvm_event_ ## compare_key }

static struct kvm_event_key keys[] = {
	DEF_SORT_NAME_KEY(sample, count),
	DEF_SORT_NAME_KEY(time, mean),
	{ NULL, NULL }
};

static bool select_key(struct perf_kvm_stat *kvm)
{
	int i;

	for (i = 0; keys[i].name; i++) {
		if (!strcmp(keys[i].name, kvm->sort_key)) {
			kvm->compare = keys[i].key;
			return true;
		}
	}

	pr_err("Unknown compare key:%s\n", kvm->sort_key);
	return false;
}

static void insert_to_result(struct rb_root *result, struct kvm_event *event,
			     key_cmp_fun bigger, int vcpu)
{
	struct rb_node **rb = &result->rb_node;
	struct rb_node *parent = NULL;
	struct kvm_event *p;

	while (*rb) {
		p = container_of(*rb, struct kvm_event, rb);
		parent = *rb;

		if (bigger(event, p, vcpu))
			rb = &(*rb)->rb_left;
		else
			rb = &(*rb)->rb_right;
	}

	rb_link_node(&event->rb, parent, rb);
	rb_insert_color(&event->rb, result);
}

static void
update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event)
{
	int vcpu = kvm->trace_vcpu;

	kvm->total_count += get_event_count(event, vcpu);
	kvm->total_time += get_event_time(event, vcpu);
}

static bool event_is_valid(struct kvm_event *event, int vcpu)
{
	return !!get_event_count(event, vcpu);
}

static void sort_result(struct perf_kvm_stat *kvm)
{
	unsigned int i;
	int vcpu = kvm->trace_vcpu;
	struct kvm_event *event;

	for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
		list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) {
			if (event_is_valid(event, vcpu)) {
				update_total_count(kvm, event);
				insert_to_result(&kvm->result, event,
						 kvm->compare, vcpu);
			}
		}
	}
}

/* returns left most element of result, and erase it */
static struct kvm_event *pop_from_result(struct rb_root *result)
{
	struct rb_node *node = rb_first(result);

	if (!node)
		return NULL;

	rb_erase(node, result);
	return container_of(node, struct kvm_event, rb);
}

static void print_vcpu_info(struct perf_kvm_stat *kvm)
{
	int vcpu = kvm->trace_vcpu;

	pr_info("Analyze events for ");

	if (kvm->opts.target.system_wide)
		pr_info("all VMs, ");
	else if (kvm->opts.target.pid)
		pr_info("pid(s) %s, ", kvm->opts.target.pid);
	else
		pr_info("dazed and confused on what is monitored, ");

	if (vcpu == -1)
		pr_info("all VCPUs:\n\n");
	else
		pr_info("VCPU %d:\n\n", vcpu);
}

static void show_timeofday(void)
{
	char date[64];
	struct timeval tv;
	struct tm ltime;

	gettimeofday(&tv, NULL);
	if (localtime_r(&tv.tv_sec, &ltime)) {
		strftime(date, sizeof(date), "%H:%M:%S", &ltime);
		pr_info("%s.%06ld", date, tv.tv_usec);
	} else
		pr_info("00:00:00.000000");

	return;
}

static void print_result(struct perf_kvm_stat *kvm)
{
	char decode[DECODE_STR_LEN];
	struct kvm_event *event;
	int vcpu = kvm->trace_vcpu;

	if (kvm->live) {
		puts(CONSOLE_CLEAR);
		show_timeofday();
	}

	pr_info("\n\n");
	print_vcpu_info(kvm);
	pr_info("%*s ", DECODE_STR_LEN, kvm->events_ops->name);
	pr_info("%10s ", "Samples");
	pr_info("%9s ", "Samples%");

	pr_info("%9s ", "Time%");
	pr_info("%11s ", "Min Time");
	pr_info("%11s ", "Max Time");
	pr_info("%16s ", "Avg time");
	pr_info("\n\n");

	while ((event = pop_from_result(&kvm->result))) {
		u64 ecount, etime, max, min;

		ecount = get_event_count(event, vcpu);
		etime = get_event_time(event, vcpu);
		max = get_event_max(event, vcpu);
		min = get_event_min(event, vcpu);

		kvm->events_ops->decode_key(kvm, &event->key, decode);
		pr_info("%*s ", DECODE_STR_LEN, decode);
		pr_info("%10llu ", (unsigned long long)ecount);
		pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
		pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
		pr_info("%9.2fus ", (double)min / 1e3);
		pr_info("%9.2fus ", (double)max / 1e3);
		pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount/1e3,
			kvm_event_rel_stddev(vcpu, event));
		pr_info("\n");
	}

	pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n",
		kvm->total_count, kvm->total_time / 1e3);

	if (kvm->lost_events)
		pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events);
}

#ifdef HAVE_TIMERFD_SUPPORT
static int process_lost_event(struct perf_tool *tool,
			      union perf_event *event __maybe_unused,
			      struct perf_sample *sample __maybe_unused,
			      struct machine *machine __maybe_unused)
{
	struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, tool);

	kvm->lost_events++;
	return 0;
}
#endif

static bool skip_sample(struct perf_kvm_stat *kvm,
			struct perf_sample *sample)
{
	if (kvm->pid_list && intlist__find(kvm->pid_list, sample->pid) == NULL)
		return true;

	return false;
}

static int process_sample_event(struct perf_tool *tool,
				union perf_event *event,
				struct perf_sample *sample,
				struct perf_evsel *evsel,
				struct machine *machine)
{
	int err = 0;
	struct thread *thread;
	struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat,
						 tool);

	if (skip_sample(kvm, sample))
		return 0;

	thread = machine__findnew_thread(machine, sample->pid, sample->tid);
	if (thread == NULL) {
		pr_debug("problem processing %d event, skipping it.\n",
			event->header.type);
		return -1;
	}

	if (!handle_kvm_event(kvm, thread, evsel, sample))
		err = -1;

	thread__put(thread);
	return err;
}

static int cpu_isa_config(struct perf_kvm_stat *kvm)
{
	char buf[64], *cpuid;
	int err;

	if (kvm->live) {
		err = get_cpuid(buf, sizeof(buf));
		if (err != 0) {
			pr_err("Failed to look up CPU type\n");
			return err;
		}
		cpuid = buf;
	} else
		cpuid = kvm->session->header.env.cpuid;

	if (!cpuid) {
		pr_err("Failed to look up CPU type\n");
		return -EINVAL;
	}

	err = cpu_isa_init(kvm, cpuid);
	if (err == -ENOTSUP)
		pr_err("CPU %s is not supported.\n", cpuid);

	return err;
}

static bool verify_vcpu(int vcpu)
{
	if (vcpu != -1 && vcpu < 0) {
		pr_err("Invalid vcpu:%d.\n", vcpu);
		return false;
	}

	return true;
}

#ifdef HAVE_TIMERFD_SUPPORT
/* keeping the max events to a modest level to keep
 * the processing of samples per mmap smooth.
 */
#define PERF_KVM__MAX_EVENTS_PER_MMAP  25

static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
				   u64 *mmap_time)
{
	union perf_event *event;
	struct perf_sample sample;
	s64 n = 0;
	int err;

	*mmap_time = ULLONG_MAX;
	while ((event = perf_evlist__mmap_read(kvm->evlist, idx)) != NULL) {
		err = perf_evlist__parse_sample(kvm->evlist, event, &sample);
		if (err) {
			perf_evlist__mmap_consume(kvm->evlist, idx);
			pr_err("Failed to parse sample\n");
			return -1;
		}

		err = perf_session__queue_event(kvm->session, event, &sample, 0);
		/*
		 * FIXME: Here we can't consume the event, as perf_session__queue_event will
		 *        point to it, and it'll get possibly overwritten by the kernel.
		 */
		perf_evlist__mmap_consume(kvm->evlist, idx);

		if (err) {
			pr_err("Failed to enqueue sample: %d\n", err);
			return -1;
		}

		/* save time stamp of our first sample for this mmap */
		if (n == 0)
			*mmap_time = sample.time;

		/* limit events per mmap handled all at once */
		n++;
		if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
			break;
	}

	return n;
}

static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm)
{
	int i, err, throttled = 0;
	s64 n, ntotal = 0;
	u64 flush_time = ULLONG_MAX, mmap_time;

	for (i = 0; i < kvm->evlist->nr_mmaps; i++) {
		n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time);
		if (n < 0)
			return -1;

		/* flush time is going to be the minimum of all the individual
		 * mmap times. Essentially, we flush all the samples queued up
		 * from the last pass under our minimal start time -- that leaves
		 * a very small race for samples to come in with a lower timestamp.
		 * The ioctl to return the perf_clock timestamp should close the
		 * race entirely.
		 */
		if (mmap_time < flush_time)
			flush_time = mmap_time;

		ntotal += n;
		if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
			throttled = 1;
	}

	/* flush queue after each round in which we processed events */
	if (ntotal) {
		struct ordered_events *oe = &kvm->session->ordered_events;

		oe->next_flush = flush_time;
		err = ordered_events__flush(oe, OE_FLUSH__ROUND);
		if (err) {
			if (kvm->lost_events)
				pr_info("\nLost events: %" PRIu64 "\n\n",
					kvm->lost_events);
			return err;
		}
	}

	return throttled;
}

static volatile int done;

static void sig_handler(int sig __maybe_unused)
{
	done = 1;
}

static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm)
{
	struct itimerspec new_value;
	int rc = -1;

	kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
	if (kvm->timerfd < 0) {
		pr_err("timerfd_create failed\n");
		goto out;
	}

	new_value.it_value.tv_sec = kvm->display_time;
	new_value.it_value.tv_nsec = 0;
	new_value.it_interval.tv_sec = kvm->display_time;
	new_value.it_interval.tv_nsec = 0;

	if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) {
		pr_err("timerfd_settime failed: %d\n", errno);
		close(kvm->timerfd);
		goto out;
	}

	rc = 0;
out:
	return rc;
}

static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
{
	uint64_t c;
	int rc;

	rc = read(kvm->timerfd, &c, sizeof(uint64_t));
	if (rc < 0) {
		if (errno == EAGAIN)
			return 0;

		pr_err("Failed to read timer fd: %d\n", errno);
		return -1;
	}

	if (rc != sizeof(uint64_t)) {
		pr_err("Error reading timer fd - invalid size returned\n");
		return -1;
	}

	if (c != 1)
		pr_debug("Missed timer beats: %" PRIu64 "\n", c-1);

	/* update display */
	sort_result(kvm);
	print_result(kvm);

	/* reset counts */
	clear_events_cache_stats(kvm->kvm_events_cache);
	kvm->total_count = 0;
	kvm->total_time = 0;
	kvm->lost_events = 0;

	return 0;
}

static int fd_set_nonblock(int fd)
{
	long arg = 0;

	arg = fcntl(fd, F_GETFL);
	if (arg < 0) {
		pr_err("Failed to get current flags for fd %d\n", fd);
		return -1;
	}

	if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) {
		pr_err("Failed to set non-block option on fd %d\n", fd);
		return -1;
	}

	return 0;
}

static int perf_kvm__handle_stdin(void)
{
	int c;

	c = getc(stdin);
	if (c == 'q')
		return 1;

	return 0;
}

static int kvm_events_live_report(struct perf_kvm_stat *kvm)
{
	int nr_stdin, ret, err = -EINVAL;
	struct termios save;

	/* live flag must be set first */
	kvm->live = true;

	ret = cpu_isa_config(kvm);
	if (ret < 0)
		return ret;

	if (!verify_vcpu(kvm->trace_vcpu) ||
	    !select_key(kvm) ||
	    !register_kvm_events_ops(kvm)) {
		goto out;
	}

	set_term_quiet_input(&save);
	init_kvm_event_record(kvm);

	signal(SIGINT, sig_handler);
	signal(SIGTERM, sig_handler);

	/* add timer fd */
	if (perf_kvm__timerfd_create(kvm) < 0) {
		err = -1;
		goto out;
	}

	if (perf_evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
		goto out;

	nr_stdin = perf_evlist__add_pollfd(kvm->evlist, fileno(stdin));
	if (nr_stdin < 0)
		goto out;

	if (fd_set_nonblock(fileno(stdin)) != 0)
		goto out;

	/* everything is good - enable the events and process */
	perf_evlist__enable(kvm->evlist);

	while (!done) {
		struct fdarray *fda = &kvm->evlist->pollfd;
		int rc;

		rc = perf_kvm__mmap_read(kvm);
		if (rc < 0)
			break;

		err = perf_kvm__handle_timerfd(kvm);
		if (err)
			goto out;

		if (fda->entries[nr_stdin].revents & POLLIN)
			done = perf_kvm__handle_stdin();

		if (!rc && !done)
			err = fdarray__poll(fda, 100);
	}

	perf_evlist__disable(kvm->evlist);

	if (err == 0) {
		sort_result(kvm);
		print_result(kvm);
	}

out:
	if (kvm->timerfd >= 0)
		close(kvm->timerfd);

	tcsetattr(0, TCSAFLUSH, &save);
	return err;
}

static int kvm_live_open_events(struct perf_kvm_stat *kvm)
{
	int err, rc = -1;
	struct perf_evsel *pos;
	struct perf_evlist *evlist = kvm->evlist;
	char sbuf[STRERR_BUFSIZE];

	perf_evlist__config(evlist, &kvm->opts);

	/*
	 * Note: exclude_{guest,host} do not apply here.
	 *       This command processes KVM tracepoints from host only
	 */
	evlist__for_each(evlist, pos) {
		struct perf_event_attr *attr = &pos->attr;

		/* make sure these *are* set */
		perf_evsel__set_sample_bit(pos, TID);
		perf_evsel__set_sample_bit(pos, TIME);
		perf_evsel__set_sample_bit(pos, CPU);
		perf_evsel__set_sample_bit(pos, RAW);
		/* make sure these are *not*; want as small a sample as possible */
		perf_evsel__reset_sample_bit(pos, PERIOD);
		perf_evsel__reset_sample_bit(pos, IP);
		perf_evsel__reset_sample_bit(pos, CALLCHAIN);
		perf_evsel__reset_sample_bit(pos, ADDR);
		perf_evsel__reset_sample_bit(pos, READ);
		attr->mmap = 0;
		attr->comm = 0;
		attr->task = 0;

		attr->sample_period = 1;

		attr->watermark = 0;
		attr->wakeup_events = 1000;

		/* will enable all once we are ready */
		attr->disabled = 1;
	}

	err = perf_evlist__open(evlist);
	if (err < 0) {
		printf("Couldn't create the events: %s\n",
		       strerror_r(errno, sbuf, sizeof(sbuf)));
		goto out;
	}

	if (perf_evlist__mmap(evlist, kvm->opts.mmap_pages, false) < 0) {
		ui__error("Failed to mmap the events: %s\n",
			  strerror_r(errno, sbuf, sizeof(sbuf)));
		perf_evlist__close(evlist);
		goto out;
	}

	rc = 0;

out:
	return rc;
}
#endif

static int read_events(struct perf_kvm_stat *kvm)
{
	int ret;

	struct perf_tool eops = {
		.sample			= process_sample_event,
		.comm			= perf_event__process_comm,
		.ordered_events		= true,
	};
	struct perf_data_file file = {
		.path = kvm->file_name,
		.mode = PERF_DATA_MODE_READ,
		.force = kvm->force,
	};

	kvm->tool = eops;
	kvm->session = perf_session__new(&file, false, &kvm->tool);
	if (!kvm->session) {
		pr_err("Initializing perf session failed\n");
		return -1;
	}

	symbol__init(&kvm->session->header.env);

	if (!perf_session__has_traces(kvm->session, "kvm record")) {
		ret = -EINVAL;
		goto out_delete;
	}

	/*
	 * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
	 * traced in the old kernel.
	 */
	ret = cpu_isa_config(kvm);
	if (ret < 0)
		goto out_delete;

	ret = perf_session__process_events(kvm->session);

out_delete:
	perf_session__delete(kvm->session);
	return ret;
}

static int parse_target_str(struct perf_kvm_stat *kvm)
{
	if (kvm->opts.target.pid) {
		kvm->pid_list = intlist__new(kvm->opts.target.pid);
		if (kvm->pid_list == NULL) {
			pr_err("Error parsing process id string\n");
			return -EINVAL;
		}
	}

	return 0;
}

static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
{
	int ret = -EINVAL;
	int vcpu = kvm->trace_vcpu;

	if (parse_target_str(kvm) != 0)
		goto exit;

	if (!verify_vcpu(vcpu))
		goto exit;

	if (!select_key(kvm))
		goto exit;

	if (!register_kvm_events_ops(kvm))
		goto exit;

	init_kvm_event_record(kvm);
	setup_pager();

	ret = read_events(kvm);
	if (ret)
		goto exit;

	sort_result(kvm);
	print_result(kvm);

exit:
	return ret;
}

#define STRDUP_FAIL_EXIT(s)		\
	({	char *_p;		\
	_p = strdup(s);		\
		if (!_p)		\
			return -ENOMEM;	\
		_p;			\
	})

static int
kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
{
	unsigned int rec_argc, i, j, events_tp_size;
	const char **rec_argv;
	const char * const record_args[] = {
		"record",
		"-R",
		"-m", "1024",
		"-c", "1",
	};
	const char * const kvm_stat_record_usage[] = {
		"perf kvm stat record [<options>]",
		NULL
	};
	const char * const *events_tp;
	events_tp_size = 0;

	for (events_tp = kvm_events_tp; *events_tp; events_tp++)
		events_tp_size++;

	rec_argc = ARRAY_SIZE(record_args) + argc + 2 +
		   2 * events_tp_size;
	rec_argv = calloc(rec_argc + 1, sizeof(char *));

	if (rec_argv == NULL)
		return -ENOMEM;

	for (i = 0; i < ARRAY_SIZE(record_args); i++)
		rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);

	for (j = 0; j < events_tp_size; j++) {
		rec_argv[i++] = "-e";
		rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]);
	}

	rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
	rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);

	for (j = 1; j < (unsigned int)argc; j++, i++)
		rec_argv[i] = argv[j];

	set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
	set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
	set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);

	set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
	set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
	set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);

	record_usage = kvm_stat_record_usage;
	return cmd_record(i, rec_argv, NULL);
}

static int
kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
{
	const struct option kvm_events_report_options[] = {
		OPT_STRING(0, "event", &kvm->report_event, "report event",
			   "event for reporting: vmexit, "
			   "mmio (x86 only), ioport (x86 only)"),
		OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
			    "vcpu id to report"),
		OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
			    "key for sorting: sample(sort by samples number)"
			    " time (sort by avg time)"),
		OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
			   "analyze events only for given process id(s)"),
		OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"),
		OPT_END()
	};

	const char * const kvm_events_report_usage[] = {
		"perf kvm stat report [<options>]",
		NULL
	};

	if (argc) {
		argc = parse_options(argc, argv,
				     kvm_events_report_options,
				     kvm_events_report_usage, 0);
		if (argc)
			usage_with_options(kvm_events_report_usage,
					   kvm_events_report_options);
	}

	if (!kvm->opts.target.pid)
		kvm->opts.target.system_wide = true;

	return kvm_events_report_vcpu(kvm);
}

#ifdef HAVE_TIMERFD_SUPPORT
static struct perf_evlist *kvm_live_event_list(void)
{
	struct perf_evlist *evlist;
	char *tp, *name, *sys;
	int err = -1;
	const char * const *events_tp;

	evlist = perf_evlist__new();
	if (evlist == NULL)
		return NULL;

	for (events_tp = kvm_events_tp; *events_tp; events_tp++) {

		tp = strdup(*events_tp);
		if (tp == NULL)
			goto out;

		/* split tracepoint into subsystem and name */
		sys = tp;
		name = strchr(tp, ':');
		if (name == NULL) {
			pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n",
			       *events_tp);
			free(tp);
			goto out;
		}
		*name = '\0';
		name++;

		if (perf_evlist__add_newtp(evlist, sys, name, NULL)) {
			pr_err("Failed to add %s tracepoint to the list\n", *events_tp);
			free(tp);
			goto out;
		}

		free(tp);
	}

	err = 0;

out:
	if (err) {
		perf_evlist__delete(evlist);
		evlist = NULL;
	}

	return evlist;
}

static int kvm_events_live(struct perf_kvm_stat *kvm,
			   int argc, const char **argv)
{
	char errbuf[BUFSIZ];
	int err;

	const struct option live_options[] = {
		OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
			"record events on existing process id"),
		OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
			"number of mmap data pages",
			perf_evlist__parse_mmap_pages),
		OPT_INCR('v', "verbose", &verbose,
			"be more verbose (show counter open errors, etc)"),
		OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
			"system-wide collection from all CPUs"),
		OPT_UINTEGER('d', "display", &kvm->display_time,
			"time in seconds between display updates"),
		OPT_STRING(0, "event", &kvm->report_event, "report event",
			"event for reporting: "
			"vmexit, mmio (x86 only), ioport (x86 only)"),
		OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
			"vcpu id to report"),
		OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
			"key for sorting: sample(sort by samples number)"
			" time (sort by avg time)"),
		OPT_U64(0, "duration", &kvm->duration,
			"show events other than"
			" HLT (x86 only) or Wait state (s390 only)"
			" that take longer than duration usecs"),
		OPT_UINTEGER(0, "proc-map-timeout", &kvm->opts.proc_map_timeout,
				"per thread proc mmap processing timeout in ms"),
		OPT_END()
	};
	const char * const live_usage[] = {
		"perf kvm stat live [<options>]",
		NULL
	};
	struct perf_data_file file = {
		.mode = PERF_DATA_MODE_WRITE,
	};


	/* event handling */
	kvm->tool.sample = process_sample_event;
	kvm->tool.comm   = perf_event__process_comm;
	kvm->tool.exit   = perf_event__process_exit;
	kvm->tool.fork   = perf_event__process_fork;
	kvm->tool.lost   = process_lost_event;
	kvm->tool.ordered_events = true;
	perf_tool__fill_defaults(&kvm->tool);

	/* set defaults */
	kvm->display_time = 1;
	kvm->opts.user_interval = 1;
	kvm->opts.mmap_pages = 512;
	kvm->opts.target.uses_mmap = false;
	kvm->opts.target.uid_str = NULL;
	kvm->opts.target.uid = UINT_MAX;
	kvm->opts.proc_map_timeout = 500;

	symbol__init(NULL);
	disable_buildid_cache();

	use_browser = 0;
	setup_browser(false);

	if (argc) {
		argc = parse_options(argc, argv, live_options,
				     live_usage, 0);
		if (argc)
			usage_with_options(live_usage, live_options);
	}

	kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */

	/*
	 * target related setups
	 */
	err = target__validate(&kvm->opts.target);
	if (err) {
		target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ);
		ui__warning("%s", errbuf);
	}

	if (target__none(&kvm->opts.target))
		kvm->opts.target.system_wide = true;


	/*
	 * generate the event list
	 */
	kvm->evlist = kvm_live_event_list();
	if (kvm->evlist == NULL) {
		err = -1;
		goto out;
	}

	symbol_conf.nr_events = kvm->evlist->nr_entries;

	if (perf_evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0)
		usage_with_options(live_usage, live_options);

	/*
	 * perf session
	 */
	kvm->session = perf_session__new(&file, false, &kvm->tool);
	if (kvm->session == NULL) {
		err = -1;
		goto out;
	}
	kvm->session->evlist = kvm->evlist;
	perf_session__set_id_hdr_size(kvm->session);
	ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
	machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
				    kvm->evlist->threads, false, kvm->opts.proc_map_timeout);
	err = kvm_live_open_events(kvm);
	if (err)
		goto out;

	err = kvm_events_live_report(kvm);

out:
	exit_browser(0);

	if (kvm->session)
		perf_session__delete(kvm->session);
	kvm->session = NULL;
	if (kvm->evlist)
		perf_evlist__delete(kvm->evlist);

	return err;
}
#endif

static void print_kvm_stat_usage(void)
{
	printf("Usage: perf kvm stat <command>\n\n");

	printf("# Available commands:\n");
	printf("\trecord: record kvm events\n");
	printf("\treport: report statistical data of kvm events\n");
	printf("\tlive:   live reporting of statistical data of kvm events\n");

	printf("\nOtherwise, it is the alias of 'perf stat':\n");
}

static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
{
	struct perf_kvm_stat kvm = {
		.file_name = file_name,

		.trace_vcpu	= -1,
		.report_event	= "vmexit",
		.sort_key	= "sample",

	};

	if (argc == 1) {
		print_kvm_stat_usage();
		goto perf_stat;
	}

	if (!strncmp(argv[1], "rec", 3))
		return kvm_events_record(&kvm, argc - 1, argv + 1);

	if (!strncmp(argv[1], "rep", 3))
		return kvm_events_report(&kvm, argc - 1 , argv + 1);

#ifdef HAVE_TIMERFD_SUPPORT
	if (!strncmp(argv[1], "live", 4))
		return kvm_events_live(&kvm, argc - 1 , argv + 1);
#endif

perf_stat:
	return cmd_stat(argc, argv, NULL);
}
#endif /* HAVE_KVM_STAT_SUPPORT */

static int __cmd_record(const char *file_name, int argc, const char **argv)
{
	int rec_argc, i = 0, j;
	const char **rec_argv;

	rec_argc = argc + 2;
	rec_argv = calloc(rec_argc + 1, sizeof(char *));
	rec_argv[i++] = strdup("record");
	rec_argv[i++] = strdup("-o");
	rec_argv[i++] = strdup(file_name);
	for (j = 1; j < argc; j++, i++)
		rec_argv[i] = argv[j];

	BUG_ON(i != rec_argc);

	return cmd_record(i, rec_argv, NULL);
}

static int __cmd_report(const char *file_name, int argc, const char **argv)
{
	int rec_argc, i = 0, j;
	const char **rec_argv;

	rec_argc = argc + 2;
	rec_argv = calloc(rec_argc + 1, sizeof(char *));
	rec_argv[i++] = strdup("report");
	rec_argv[i++] = strdup("-i");
	rec_argv[i++] = strdup(file_name);
	for (j = 1; j < argc; j++, i++)
		rec_argv[i] = argv[j];

	BUG_ON(i != rec_argc);

	return cmd_report(i, rec_argv, NULL);
}

static int
__cmd_buildid_list(const char *file_name, int argc, const char **argv)
{
	int rec_argc, i = 0, j;
	const char **rec_argv;

	rec_argc = argc + 2;
	rec_argv = calloc(rec_argc + 1, sizeof(char *));
	rec_argv[i++] = strdup("buildid-list");
	rec_argv[i++] = strdup("-i");
	rec_argv[i++] = strdup(file_name);
	for (j = 1; j < argc; j++, i++)
		rec_argv[i] = argv[j];

	BUG_ON(i != rec_argc);

	return cmd_buildid_list(i, rec_argv, NULL);
}

int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
{
	const char *file_name = NULL;
	const struct option kvm_options[] = {
		OPT_STRING('i', "input", &file_name, "file",
			   "Input file name"),
		OPT_STRING('o', "output", &file_name, "file",
			   "Output file name"),
		OPT_BOOLEAN(0, "guest", &perf_guest,
			    "Collect guest os data"),
		OPT_BOOLEAN(0, "host", &perf_host,
			    "Collect host os data"),
		OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
			   "guest mount directory under which every guest os"
			   " instance has a subdir"),
		OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
			   "file", "file saving guest os vmlinux"),
		OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
			   "file", "file saving guest os /proc/kallsyms"),
		OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
			   "file", "file saving guest os /proc/modules"),
		OPT_INCR('v', "verbose", &verbose,
			    "be more verbose (show counter open errors, etc)"),
		OPT_END()
	};

	const char *const kvm_subcommands[] = { "top", "record", "report", "diff",
						"buildid-list", "stat", NULL };
	const char *kvm_usage[] = { NULL, NULL };

	perf_host  = 0;
	perf_guest = 1;

	argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, kvm_usage,
					PARSE_OPT_STOP_AT_NON_OPTION);
	if (!argc)
		usage_with_options(kvm_usage, kvm_options);

	if (!perf_host)
		perf_guest = 1;

	if (!file_name) {
		file_name = get_filename_for_perf_kvm();

		if (!file_name) {
			pr_err("Failed to allocate memory for filename\n");
			return -ENOMEM;
		}
	}

	if (!strncmp(argv[0], "rec", 3))
		return __cmd_record(file_name, argc, argv);
	else if (!strncmp(argv[0], "rep", 3))
		return __cmd_report(file_name, argc, argv);
	else if (!strncmp(argv[0], "diff", 4))
		return cmd_diff(argc, argv, NULL);
	else if (!strncmp(argv[0], "top", 3))
		return cmd_top(argc, argv, NULL);
	else if (!strncmp(argv[0], "buildid-list", 12))
		return __cmd_buildid_list(file_name, argc, argv);
#ifdef HAVE_KVM_STAT_SUPPORT
	else if (!strncmp(argv[0], "stat", 4))
		return kvm_cmd_stat(file_name, argc, argv);
#endif
	else
		usage_with_options(kvm_usage, kvm_options);

	return 0;
}