GNU Linux-libre 5.10.219-gnu1
[releases.git] / tools / perf / builtin-kvm.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include "builtin.h"
3 #include "perf.h"
4
5 #include "util/build-id.h"
6 #include "util/evsel.h"
7 #include "util/evlist.h"
8 #include "util/mmap.h"
9 #include "util/term.h"
10 #include "util/symbol.h"
11 #include "util/thread.h"
12 #include "util/header.h"
13 #include "util/session.h"
14 #include "util/intlist.h"
15 #include <subcmd/pager.h>
16 #include <subcmd/parse-options.h>
17 #include "util/trace-event.h"
18 #include "util/debug.h"
19 #include "util/tool.h"
20 #include "util/stat.h"
21 #include "util/synthetic-events.h"
22 #include "util/top.h"
23 #include "util/data.h"
24 #include "util/ordered-events.h"
25 #include "util/kvm-stat.h"
26 #include "ui/ui.h"
27
28 #include <sys/prctl.h>
29 #ifdef HAVE_TIMERFD_SUPPORT
30 #include <sys/timerfd.h>
31 #endif
32 #include <sys/time.h>
33 #include <sys/types.h>
34 #include <sys/stat.h>
35 #include <fcntl.h>
36
37 #include <linux/err.h>
38 #include <linux/kernel.h>
39 #include <linux/string.h>
40 #include <linux/time64.h>
41 #include <linux/zalloc.h>
42 #include <errno.h>
43 #include <inttypes.h>
44 #include <poll.h>
45 #include <termios.h>
46 #include <semaphore.h>
47 #include <signal.h>
48 #include <math.h>
49 #include <perf/mmap.h>
50
51 static const char *get_filename_for_perf_kvm(void)
52 {
53         const char *filename;
54
55         if (perf_host && !perf_guest)
56                 filename = strdup("perf.data.host");
57         else if (!perf_host && perf_guest)
58                 filename = strdup("perf.data.guest");
59         else
60                 filename = strdup("perf.data.kvm");
61
62         return filename;
63 }
64
65 #ifdef HAVE_KVM_STAT_SUPPORT
66
67 void exit_event_get_key(struct evsel *evsel,
68                         struct perf_sample *sample,
69                         struct event_key *key)
70 {
71         key->info = 0;
72         key->key  = evsel__intval(evsel, sample, kvm_exit_reason);
73 }
74
75 bool kvm_exit_event(struct evsel *evsel)
76 {
77         return !strcmp(evsel->name, kvm_exit_trace);
78 }
79
80 bool exit_event_begin(struct evsel *evsel,
81                       struct perf_sample *sample, struct event_key *key)
82 {
83         if (kvm_exit_event(evsel)) {
84                 exit_event_get_key(evsel, sample, key);
85                 return true;
86         }
87
88         return false;
89 }
90
91 bool kvm_entry_event(struct evsel *evsel)
92 {
93         return !strcmp(evsel->name, kvm_entry_trace);
94 }
95
96 bool exit_event_end(struct evsel *evsel,
97                     struct perf_sample *sample __maybe_unused,
98                     struct event_key *key __maybe_unused)
99 {
100         return kvm_entry_event(evsel);
101 }
102
103 static const char *get_exit_reason(struct perf_kvm_stat *kvm,
104                                    struct exit_reasons_table *tbl,
105                                    u64 exit_code)
106 {
107         while (tbl->reason != NULL) {
108                 if (tbl->exit_code == exit_code)
109                         return tbl->reason;
110                 tbl++;
111         }
112
113         pr_err("unknown kvm exit code:%lld on %s\n",
114                 (unsigned long long)exit_code, kvm->exit_reasons_isa);
115         return "UNKNOWN";
116 }
117
118 void exit_event_decode_key(struct perf_kvm_stat *kvm,
119                            struct event_key *key,
120                            char *decode)
121 {
122         const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
123                                                   key->key);
124
125         scnprintf(decode, decode_str_len, "%s", exit_reason);
126 }
127
128 static bool register_kvm_events_ops(struct perf_kvm_stat *kvm)
129 {
130         struct kvm_reg_events_ops *events_ops = kvm_reg_events_ops;
131
132         for (events_ops = kvm_reg_events_ops; events_ops->name; events_ops++) {
133                 if (!strcmp(events_ops->name, kvm->report_event)) {
134                         kvm->events_ops = events_ops->ops;
135                         return true;
136                 }
137         }
138
139         return false;
140 }
141
142 struct vcpu_event_record {
143         int vcpu_id;
144         u64 start_time;
145         struct kvm_event *last_event;
146 };
147
148
149 static void init_kvm_event_record(struct perf_kvm_stat *kvm)
150 {
151         unsigned int i;
152
153         for (i = 0; i < EVENTS_CACHE_SIZE; i++)
154                 INIT_LIST_HEAD(&kvm->kvm_events_cache[i]);
155 }
156
157 #ifdef HAVE_TIMERFD_SUPPORT
158 static void clear_events_cache_stats(struct list_head *kvm_events_cache)
159 {
160         struct list_head *head;
161         struct kvm_event *event;
162         unsigned int i;
163         int j;
164
165         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
166                 head = &kvm_events_cache[i];
167                 list_for_each_entry(event, head, hash_entry) {
168                         /* reset stats for event */
169                         event->total.time = 0;
170                         init_stats(&event->total.stats);
171
172                         for (j = 0; j < event->max_vcpu; ++j) {
173                                 event->vcpu[j].time = 0;
174                                 init_stats(&event->vcpu[j].stats);
175                         }
176                 }
177         }
178 }
179 #endif
180
181 static int kvm_events_hash_fn(u64 key)
182 {
183         return key & (EVENTS_CACHE_SIZE - 1);
184 }
185
186 static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
187 {
188         int old_max_vcpu = event->max_vcpu;
189         void *prev;
190
191         if (vcpu_id < event->max_vcpu)
192                 return true;
193
194         while (event->max_vcpu <= vcpu_id)
195                 event->max_vcpu += DEFAULT_VCPU_NUM;
196
197         prev = event->vcpu;
198         event->vcpu = realloc(event->vcpu,
199                               event->max_vcpu * sizeof(*event->vcpu));
200         if (!event->vcpu) {
201                 free(prev);
202                 pr_err("Not enough memory\n");
203                 return false;
204         }
205
206         memset(event->vcpu + old_max_vcpu, 0,
207                (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
208         return true;
209 }
210
211 static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
212 {
213         struct kvm_event *event;
214
215         event = zalloc(sizeof(*event));
216         if (!event) {
217                 pr_err("Not enough memory\n");
218                 return NULL;
219         }
220
221         event->key = *key;
222         init_stats(&event->total.stats);
223         return event;
224 }
225
226 static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm,
227                                                struct event_key *key)
228 {
229         struct kvm_event *event;
230         struct list_head *head;
231
232         BUG_ON(key->key == INVALID_KEY);
233
234         head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)];
235         list_for_each_entry(event, head, hash_entry) {
236                 if (event->key.key == key->key && event->key.info == key->info)
237                         return event;
238         }
239
240         event = kvm_alloc_init_event(key);
241         if (!event)
242                 return NULL;
243
244         list_add(&event->hash_entry, head);
245         return event;
246 }
247
248 static bool handle_begin_event(struct perf_kvm_stat *kvm,
249                                struct vcpu_event_record *vcpu_record,
250                                struct event_key *key, u64 timestamp)
251 {
252         struct kvm_event *event = NULL;
253
254         if (key->key != INVALID_KEY)
255                 event = find_create_kvm_event(kvm, key);
256
257         vcpu_record->last_event = event;
258         vcpu_record->start_time = timestamp;
259         return true;
260 }
261
262 static void
263 kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff)
264 {
265         kvm_stats->time += time_diff;
266         update_stats(&kvm_stats->stats, time_diff);
267 }
268
269 static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
270 {
271         struct kvm_event_stats *kvm_stats = &event->total;
272
273         if (vcpu_id != -1)
274                 kvm_stats = &event->vcpu[vcpu_id];
275
276         return rel_stddev_stats(stddev_stats(&kvm_stats->stats),
277                                 avg_stats(&kvm_stats->stats));
278 }
279
280 static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
281                              u64 time_diff)
282 {
283         if (vcpu_id == -1) {
284                 kvm_update_event_stats(&event->total, time_diff);
285                 return true;
286         }
287
288         if (!kvm_event_expand(event, vcpu_id))
289                 return false;
290
291         kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
292         return true;
293 }
294
295 static bool is_child_event(struct perf_kvm_stat *kvm,
296                            struct evsel *evsel,
297                            struct perf_sample *sample,
298                            struct event_key *key)
299 {
300         struct child_event_ops *child_ops;
301
302         child_ops = kvm->events_ops->child_ops;
303
304         if (!child_ops)
305                 return false;
306
307         for (; child_ops->name; child_ops++) {
308                 if (!strcmp(evsel->name, child_ops->name)) {
309                         child_ops->get_key(evsel, sample, key);
310                         return true;
311                 }
312         }
313
314         return false;
315 }
316
317 static bool handle_child_event(struct perf_kvm_stat *kvm,
318                                struct vcpu_event_record *vcpu_record,
319                                struct event_key *key,
320                                struct perf_sample *sample __maybe_unused)
321 {
322         struct kvm_event *event = NULL;
323
324         if (key->key != INVALID_KEY)
325                 event = find_create_kvm_event(kvm, key);
326
327         vcpu_record->last_event = event;
328
329         return true;
330 }
331
332 static bool skip_event(const char *event)
333 {
334         const char * const *skip_events;
335
336         for (skip_events = kvm_skip_events; *skip_events; skip_events++)
337                 if (!strcmp(event, *skip_events))
338                         return true;
339
340         return false;
341 }
342
343 static bool handle_end_event(struct perf_kvm_stat *kvm,
344                              struct vcpu_event_record *vcpu_record,
345                              struct event_key *key,
346                              struct perf_sample *sample)
347 {
348         struct kvm_event *event;
349         u64 time_begin, time_diff;
350         int vcpu;
351
352         if (kvm->trace_vcpu == -1)
353                 vcpu = -1;
354         else
355                 vcpu = vcpu_record->vcpu_id;
356
357         event = vcpu_record->last_event;
358         time_begin = vcpu_record->start_time;
359
360         /* The begin event is not caught. */
361         if (!time_begin)
362                 return true;
363
364         /*
365          * In some case, the 'begin event' only records the start timestamp,
366          * the actual event is recognized in the 'end event' (e.g. mmio-event).
367          */
368
369         /* Both begin and end events did not get the key. */
370         if (!event && key->key == INVALID_KEY)
371                 return true;
372
373         if (!event)
374                 event = find_create_kvm_event(kvm, key);
375
376         if (!event)
377                 return false;
378
379         vcpu_record->last_event = NULL;
380         vcpu_record->start_time = 0;
381
382         /* seems to happen once in a while during live mode */
383         if (sample->time < time_begin) {
384                 pr_debug("End time before begin time; skipping event.\n");
385                 return true;
386         }
387
388         time_diff = sample->time - time_begin;
389
390         if (kvm->duration && time_diff > kvm->duration) {
391                 char decode[decode_str_len];
392
393                 kvm->events_ops->decode_key(kvm, &event->key, decode);
394                 if (!skip_event(decode)) {
395                         pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
396                                  sample->time, sample->pid, vcpu_record->vcpu_id,
397                                  decode, time_diff / NSEC_PER_USEC);
398                 }
399         }
400
401         return update_kvm_event(event, vcpu, time_diff);
402 }
403
404 static
405 struct vcpu_event_record *per_vcpu_record(struct thread *thread,
406                                           struct evsel *evsel,
407                                           struct perf_sample *sample)
408 {
409         /* Only kvm_entry records vcpu id. */
410         if (!thread__priv(thread) && kvm_entry_event(evsel)) {
411                 struct vcpu_event_record *vcpu_record;
412
413                 vcpu_record = zalloc(sizeof(*vcpu_record));
414                 if (!vcpu_record) {
415                         pr_err("%s: Not enough memory\n", __func__);
416                         return NULL;
417                 }
418
419                 vcpu_record->vcpu_id = evsel__intval(evsel, sample, vcpu_id_str);
420                 thread__set_priv(thread, vcpu_record);
421         }
422
423         return thread__priv(thread);
424 }
425
426 static bool handle_kvm_event(struct perf_kvm_stat *kvm,
427                              struct thread *thread,
428                              struct evsel *evsel,
429                              struct perf_sample *sample)
430 {
431         struct vcpu_event_record *vcpu_record;
432         struct event_key key = { .key = INVALID_KEY,
433                                  .exit_reasons = kvm->exit_reasons };
434
435         vcpu_record = per_vcpu_record(thread, evsel, sample);
436         if (!vcpu_record)
437                 return true;
438
439         /* only process events for vcpus user cares about */
440         if ((kvm->trace_vcpu != -1) &&
441             (kvm->trace_vcpu != vcpu_record->vcpu_id))
442                 return true;
443
444         if (kvm->events_ops->is_begin_event(evsel, sample, &key))
445                 return handle_begin_event(kvm, vcpu_record, &key, sample->time);
446
447         if (is_child_event(kvm, evsel, sample, &key))
448                 return handle_child_event(kvm, vcpu_record, &key, sample);
449
450         if (kvm->events_ops->is_end_event(evsel, sample, &key))
451                 return handle_end_event(kvm, vcpu_record, &key, sample);
452
453         return true;
454 }
455
456 #define GET_EVENT_KEY(func, field)                                      \
457 static u64 get_event_ ##func(struct kvm_event *event, int vcpu)         \
458 {                                                                       \
459         if (vcpu == -1)                                                 \
460                 return event->total.field;                              \
461                                                                         \
462         if (vcpu >= event->max_vcpu)                                    \
463                 return 0;                                               \
464                                                                         \
465         return event->vcpu[vcpu].field;                                 \
466 }
467
468 #define COMPARE_EVENT_KEY(func, field)                                  \
469 GET_EVENT_KEY(func, field)                                              \
470 static int compare_kvm_event_ ## func(struct kvm_event *one,            \
471                                         struct kvm_event *two, int vcpu)\
472 {                                                                       \
473         return get_event_ ##func(one, vcpu) >                           \
474                                 get_event_ ##func(two, vcpu);           \
475 }
476
477 GET_EVENT_KEY(time, time);
478 COMPARE_EVENT_KEY(count, stats.n);
479 COMPARE_EVENT_KEY(mean, stats.mean);
480 GET_EVENT_KEY(max, stats.max);
481 GET_EVENT_KEY(min, stats.min);
482
483 #define DEF_SORT_NAME_KEY(name, compare_key)                            \
484         { #name, compare_kvm_event_ ## compare_key }
485
486 static struct kvm_event_key keys[] = {
487         DEF_SORT_NAME_KEY(sample, count),
488         DEF_SORT_NAME_KEY(time, mean),
489         { NULL, NULL }
490 };
491
492 static bool select_key(struct perf_kvm_stat *kvm)
493 {
494         int i;
495
496         for (i = 0; keys[i].name; i++) {
497                 if (!strcmp(keys[i].name, kvm->sort_key)) {
498                         kvm->compare = keys[i].key;
499                         return true;
500                 }
501         }
502
503         pr_err("Unknown compare key:%s\n", kvm->sort_key);
504         return false;
505 }
506
507 static void insert_to_result(struct rb_root *result, struct kvm_event *event,
508                              key_cmp_fun bigger, int vcpu)
509 {
510         struct rb_node **rb = &result->rb_node;
511         struct rb_node *parent = NULL;
512         struct kvm_event *p;
513
514         while (*rb) {
515                 p = container_of(*rb, struct kvm_event, rb);
516                 parent = *rb;
517
518                 if (bigger(event, p, vcpu))
519                         rb = &(*rb)->rb_left;
520                 else
521                         rb = &(*rb)->rb_right;
522         }
523
524         rb_link_node(&event->rb, parent, rb);
525         rb_insert_color(&event->rb, result);
526 }
527
528 static void
529 update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event)
530 {
531         int vcpu = kvm->trace_vcpu;
532
533         kvm->total_count += get_event_count(event, vcpu);
534         kvm->total_time += get_event_time(event, vcpu);
535 }
536
537 static bool event_is_valid(struct kvm_event *event, int vcpu)
538 {
539         return !!get_event_count(event, vcpu);
540 }
541
542 static void sort_result(struct perf_kvm_stat *kvm)
543 {
544         unsigned int i;
545         int vcpu = kvm->trace_vcpu;
546         struct kvm_event *event;
547
548         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
549                 list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) {
550                         if (event_is_valid(event, vcpu)) {
551                                 update_total_count(kvm, event);
552                                 insert_to_result(&kvm->result, event,
553                                                  kvm->compare, vcpu);
554                         }
555                 }
556         }
557 }
558
559 /* returns left most element of result, and erase it */
560 static struct kvm_event *pop_from_result(struct rb_root *result)
561 {
562         struct rb_node *node = rb_first(result);
563
564         if (!node)
565                 return NULL;
566
567         rb_erase(node, result);
568         return container_of(node, struct kvm_event, rb);
569 }
570
571 static void print_vcpu_info(struct perf_kvm_stat *kvm)
572 {
573         int vcpu = kvm->trace_vcpu;
574
575         pr_info("Analyze events for ");
576
577         if (kvm->opts.target.system_wide)
578                 pr_info("all VMs, ");
579         else if (kvm->opts.target.pid)
580                 pr_info("pid(s) %s, ", kvm->opts.target.pid);
581         else
582                 pr_info("dazed and confused on what is monitored, ");
583
584         if (vcpu == -1)
585                 pr_info("all VCPUs:\n\n");
586         else
587                 pr_info("VCPU %d:\n\n", vcpu);
588 }
589
590 static void show_timeofday(void)
591 {
592         char date[64];
593         struct timeval tv;
594         struct tm ltime;
595
596         gettimeofday(&tv, NULL);
597         if (localtime_r(&tv.tv_sec, &ltime)) {
598                 strftime(date, sizeof(date), "%H:%M:%S", &ltime);
599                 pr_info("%s.%06ld", date, tv.tv_usec);
600         } else
601                 pr_info("00:00:00.000000");
602
603         return;
604 }
605
606 static void print_result(struct perf_kvm_stat *kvm)
607 {
608         char decode[decode_str_len];
609         struct kvm_event *event;
610         int vcpu = kvm->trace_vcpu;
611
612         if (kvm->live) {
613                 puts(CONSOLE_CLEAR);
614                 show_timeofday();
615         }
616
617         pr_info("\n\n");
618         print_vcpu_info(kvm);
619         pr_info("%*s ", decode_str_len, kvm->events_ops->name);
620         pr_info("%10s ", "Samples");
621         pr_info("%9s ", "Samples%");
622
623         pr_info("%9s ", "Time%");
624         pr_info("%11s ", "Min Time");
625         pr_info("%11s ", "Max Time");
626         pr_info("%16s ", "Avg time");
627         pr_info("\n\n");
628
629         while ((event = pop_from_result(&kvm->result))) {
630                 u64 ecount, etime, max, min;
631
632                 ecount = get_event_count(event, vcpu);
633                 etime = get_event_time(event, vcpu);
634                 max = get_event_max(event, vcpu);
635                 min = get_event_min(event, vcpu);
636
637                 kvm->events_ops->decode_key(kvm, &event->key, decode);
638                 pr_info("%*s ", decode_str_len, decode);
639                 pr_info("%10llu ", (unsigned long long)ecount);
640                 pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
641                 pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
642                 pr_info("%9.2fus ", (double)min / NSEC_PER_USEC);
643                 pr_info("%9.2fus ", (double)max / NSEC_PER_USEC);
644                 pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount / NSEC_PER_USEC,
645                         kvm_event_rel_stddev(vcpu, event));
646                 pr_info("\n");
647         }
648
649         pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n",
650                 kvm->total_count, kvm->total_time / (double)NSEC_PER_USEC);
651
652         if (kvm->lost_events)
653                 pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events);
654 }
655
656 #ifdef HAVE_TIMERFD_SUPPORT
657 static int process_lost_event(struct perf_tool *tool,
658                               union perf_event *event __maybe_unused,
659                               struct perf_sample *sample __maybe_unused,
660                               struct machine *machine __maybe_unused)
661 {
662         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, tool);
663
664         kvm->lost_events++;
665         return 0;
666 }
667 #endif
668
669 static bool skip_sample(struct perf_kvm_stat *kvm,
670                         struct perf_sample *sample)
671 {
672         if (kvm->pid_list && intlist__find(kvm->pid_list, sample->pid) == NULL)
673                 return true;
674
675         return false;
676 }
677
678 static int process_sample_event(struct perf_tool *tool,
679                                 union perf_event *event,
680                                 struct perf_sample *sample,
681                                 struct evsel *evsel,
682                                 struct machine *machine)
683 {
684         int err = 0;
685         struct thread *thread;
686         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat,
687                                                  tool);
688
689         if (skip_sample(kvm, sample))
690                 return 0;
691
692         thread = machine__findnew_thread(machine, sample->pid, sample->tid);
693         if (thread == NULL) {
694                 pr_debug("problem processing %d event, skipping it.\n",
695                         event->header.type);
696                 return -1;
697         }
698
699         if (!handle_kvm_event(kvm, thread, evsel, sample))
700                 err = -1;
701
702         thread__put(thread);
703         return err;
704 }
705
706 static int cpu_isa_config(struct perf_kvm_stat *kvm)
707 {
708         char buf[128], *cpuid;
709         int err;
710
711         if (kvm->live) {
712                 err = get_cpuid(buf, sizeof(buf));
713                 if (err != 0) {
714                         pr_err("Failed to look up CPU type: %s\n",
715                                str_error_r(err, buf, sizeof(buf)));
716                         return -err;
717                 }
718                 cpuid = buf;
719         } else
720                 cpuid = kvm->session->header.env.cpuid;
721
722         if (!cpuid) {
723                 pr_err("Failed to look up CPU type\n");
724                 return -EINVAL;
725         }
726
727         err = cpu_isa_init(kvm, cpuid);
728         if (err == -ENOTSUP)
729                 pr_err("CPU %s is not supported.\n", cpuid);
730
731         return err;
732 }
733
734 static bool verify_vcpu(int vcpu)
735 {
736         if (vcpu != -1 && vcpu < 0) {
737                 pr_err("Invalid vcpu:%d.\n", vcpu);
738                 return false;
739         }
740
741         return true;
742 }
743
744 #ifdef HAVE_TIMERFD_SUPPORT
745 /* keeping the max events to a modest level to keep
746  * the processing of samples per mmap smooth.
747  */
748 #define PERF_KVM__MAX_EVENTS_PER_MMAP  25
749
750 static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
751                                    u64 *mmap_time)
752 {
753         struct evlist *evlist = kvm->evlist;
754         union perf_event *event;
755         struct mmap *md;
756         u64 timestamp;
757         s64 n = 0;
758         int err;
759
760         *mmap_time = ULLONG_MAX;
761         md = &evlist->mmap[idx];
762         err = perf_mmap__read_init(&md->core);
763         if (err < 0)
764                 return (err == -EAGAIN) ? 0 : -1;
765
766         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
767                 err = perf_evlist__parse_sample_timestamp(evlist, event, &timestamp);
768                 if (err) {
769                         perf_mmap__consume(&md->core);
770                         pr_err("Failed to parse sample\n");
771                         return -1;
772                 }
773
774                 err = perf_session__queue_event(kvm->session, event, timestamp, 0);
775                 /*
776                  * FIXME: Here we can't consume the event, as perf_session__queue_event will
777                  *        point to it, and it'll get possibly overwritten by the kernel.
778                  */
779                 perf_mmap__consume(&md->core);
780
781                 if (err) {
782                         pr_err("Failed to enqueue sample: %d\n", err);
783                         return -1;
784                 }
785
786                 /* save time stamp of our first sample for this mmap */
787                 if (n == 0)
788                         *mmap_time = timestamp;
789
790                 /* limit events per mmap handled all at once */
791                 n++;
792                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
793                         break;
794         }
795
796         perf_mmap__read_done(&md->core);
797         return n;
798 }
799
800 static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm)
801 {
802         int i, err, throttled = 0;
803         s64 n, ntotal = 0;
804         u64 flush_time = ULLONG_MAX, mmap_time;
805
806         for (i = 0; i < kvm->evlist->core.nr_mmaps; i++) {
807                 n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time);
808                 if (n < 0)
809                         return -1;
810
811                 /* flush time is going to be the minimum of all the individual
812                  * mmap times. Essentially, we flush all the samples queued up
813                  * from the last pass under our minimal start time -- that leaves
814                  * a very small race for samples to come in with a lower timestamp.
815                  * The ioctl to return the perf_clock timestamp should close the
816                  * race entirely.
817                  */
818                 if (mmap_time < flush_time)
819                         flush_time = mmap_time;
820
821                 ntotal += n;
822                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
823                         throttled = 1;
824         }
825
826         /* flush queue after each round in which we processed events */
827         if (ntotal) {
828                 struct ordered_events *oe = &kvm->session->ordered_events;
829
830                 oe->next_flush = flush_time;
831                 err = ordered_events__flush(oe, OE_FLUSH__ROUND);
832                 if (err) {
833                         if (kvm->lost_events)
834                                 pr_info("\nLost events: %" PRIu64 "\n\n",
835                                         kvm->lost_events);
836                         return err;
837                 }
838         }
839
840         return throttled;
841 }
842
843 static volatile int done;
844
845 static void sig_handler(int sig __maybe_unused)
846 {
847         done = 1;
848 }
849
850 static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm)
851 {
852         struct itimerspec new_value;
853         int rc = -1;
854
855         kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
856         if (kvm->timerfd < 0) {
857                 pr_err("timerfd_create failed\n");
858                 goto out;
859         }
860
861         new_value.it_value.tv_sec = kvm->display_time;
862         new_value.it_value.tv_nsec = 0;
863         new_value.it_interval.tv_sec = kvm->display_time;
864         new_value.it_interval.tv_nsec = 0;
865
866         if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) {
867                 pr_err("timerfd_settime failed: %d\n", errno);
868                 close(kvm->timerfd);
869                 goto out;
870         }
871
872         rc = 0;
873 out:
874         return rc;
875 }
876
877 static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
878 {
879         uint64_t c;
880         int rc;
881
882         rc = read(kvm->timerfd, &c, sizeof(uint64_t));
883         if (rc < 0) {
884                 if (errno == EAGAIN)
885                         return 0;
886
887                 pr_err("Failed to read timer fd: %d\n", errno);
888                 return -1;
889         }
890
891         if (rc != sizeof(uint64_t)) {
892                 pr_err("Error reading timer fd - invalid size returned\n");
893                 return -1;
894         }
895
896         if (c != 1)
897                 pr_debug("Missed timer beats: %" PRIu64 "\n", c-1);
898
899         /* update display */
900         sort_result(kvm);
901         print_result(kvm);
902
903         /* reset counts */
904         clear_events_cache_stats(kvm->kvm_events_cache);
905         kvm->total_count = 0;
906         kvm->total_time = 0;
907         kvm->lost_events = 0;
908
909         return 0;
910 }
911
912 static int fd_set_nonblock(int fd)
913 {
914         long arg = 0;
915
916         arg = fcntl(fd, F_GETFL);
917         if (arg < 0) {
918                 pr_err("Failed to get current flags for fd %d\n", fd);
919                 return -1;
920         }
921
922         if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) {
923                 pr_err("Failed to set non-block option on fd %d\n", fd);
924                 return -1;
925         }
926
927         return 0;
928 }
929
930 static int perf_kvm__handle_stdin(void)
931 {
932         int c;
933
934         c = getc(stdin);
935         if (c == 'q')
936                 return 1;
937
938         return 0;
939 }
940
941 static int kvm_events_live_report(struct perf_kvm_stat *kvm)
942 {
943         int nr_stdin, ret, err = -EINVAL;
944         struct termios save;
945
946         /* live flag must be set first */
947         kvm->live = true;
948
949         ret = cpu_isa_config(kvm);
950         if (ret < 0)
951                 return ret;
952
953         if (!verify_vcpu(kvm->trace_vcpu) ||
954             !select_key(kvm) ||
955             !register_kvm_events_ops(kvm)) {
956                 goto out;
957         }
958
959         set_term_quiet_input(&save);
960         init_kvm_event_record(kvm);
961
962         signal(SIGINT, sig_handler);
963         signal(SIGTERM, sig_handler);
964
965         /* add timer fd */
966         if (perf_kvm__timerfd_create(kvm) < 0) {
967                 err = -1;
968                 goto out;
969         }
970
971         if (evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
972                 goto out;
973
974         nr_stdin = evlist__add_pollfd(kvm->evlist, fileno(stdin));
975         if (nr_stdin < 0)
976                 goto out;
977
978         if (fd_set_nonblock(fileno(stdin)) != 0)
979                 goto out;
980
981         /* everything is good - enable the events and process */
982         evlist__enable(kvm->evlist);
983
984         while (!done) {
985                 struct fdarray *fda = &kvm->evlist->core.pollfd;
986                 int rc;
987
988                 rc = perf_kvm__mmap_read(kvm);
989                 if (rc < 0)
990                         break;
991
992                 err = perf_kvm__handle_timerfd(kvm);
993                 if (err)
994                         goto out;
995
996                 if (fda->entries[nr_stdin].revents & POLLIN)
997                         done = perf_kvm__handle_stdin();
998
999                 if (!rc && !done)
1000                         err = evlist__poll(kvm->evlist, 100);
1001         }
1002
1003         evlist__disable(kvm->evlist);
1004
1005         if (err == 0) {
1006                 sort_result(kvm);
1007                 print_result(kvm);
1008         }
1009
1010 out:
1011         if (kvm->timerfd >= 0)
1012                 close(kvm->timerfd);
1013
1014         tcsetattr(0, TCSAFLUSH, &save);
1015         return err;
1016 }
1017
1018 static int kvm_live_open_events(struct perf_kvm_stat *kvm)
1019 {
1020         int err, rc = -1;
1021         struct evsel *pos;
1022         struct evlist *evlist = kvm->evlist;
1023         char sbuf[STRERR_BUFSIZE];
1024
1025         perf_evlist__config(evlist, &kvm->opts, NULL);
1026
1027         /*
1028          * Note: exclude_{guest,host} do not apply here.
1029          *       This command processes KVM tracepoints from host only
1030          */
1031         evlist__for_each_entry(evlist, pos) {
1032                 struct perf_event_attr *attr = &pos->core.attr;
1033
1034                 /* make sure these *are* set */
1035                 evsel__set_sample_bit(pos, TID);
1036                 evsel__set_sample_bit(pos, TIME);
1037                 evsel__set_sample_bit(pos, CPU);
1038                 evsel__set_sample_bit(pos, RAW);
1039                 /* make sure these are *not*; want as small a sample as possible */
1040                 evsel__reset_sample_bit(pos, PERIOD);
1041                 evsel__reset_sample_bit(pos, IP);
1042                 evsel__reset_sample_bit(pos, CALLCHAIN);
1043                 evsel__reset_sample_bit(pos, ADDR);
1044                 evsel__reset_sample_bit(pos, READ);
1045                 attr->mmap = 0;
1046                 attr->comm = 0;
1047                 attr->task = 0;
1048
1049                 attr->sample_period = 1;
1050
1051                 attr->watermark = 0;
1052                 attr->wakeup_events = 1000;
1053
1054                 /* will enable all once we are ready */
1055                 attr->disabled = 1;
1056         }
1057
1058         err = evlist__open(evlist);
1059         if (err < 0) {
1060                 printf("Couldn't create the events: %s\n",
1061                        str_error_r(errno, sbuf, sizeof(sbuf)));
1062                 goto out;
1063         }
1064
1065         if (evlist__mmap(evlist, kvm->opts.mmap_pages) < 0) {
1066                 ui__error("Failed to mmap the events: %s\n",
1067                           str_error_r(errno, sbuf, sizeof(sbuf)));
1068                 evlist__close(evlist);
1069                 goto out;
1070         }
1071
1072         rc = 0;
1073
1074 out:
1075         return rc;
1076 }
1077 #endif
1078
1079 static int read_events(struct perf_kvm_stat *kvm)
1080 {
1081         int ret;
1082
1083         struct perf_tool eops = {
1084                 .sample                 = process_sample_event,
1085                 .comm                   = perf_event__process_comm,
1086                 .namespaces             = perf_event__process_namespaces,
1087                 .ordered_events         = true,
1088         };
1089         struct perf_data file = {
1090                 .path  = kvm->file_name,
1091                 .mode  = PERF_DATA_MODE_READ,
1092                 .force = kvm->force,
1093         };
1094
1095         kvm->tool = eops;
1096         kvm->session = perf_session__new(&file, false, &kvm->tool);
1097         if (IS_ERR(kvm->session)) {
1098                 pr_err("Initializing perf session failed\n");
1099                 return PTR_ERR(kvm->session);
1100         }
1101
1102         symbol__init(&kvm->session->header.env);
1103
1104         if (!perf_session__has_traces(kvm->session, "kvm record")) {
1105                 ret = -EINVAL;
1106                 goto out_delete;
1107         }
1108
1109         /*
1110          * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
1111          * traced in the old kernel.
1112          */
1113         ret = cpu_isa_config(kvm);
1114         if (ret < 0)
1115                 goto out_delete;
1116
1117         ret = perf_session__process_events(kvm->session);
1118
1119 out_delete:
1120         perf_session__delete(kvm->session);
1121         return ret;
1122 }
1123
1124 static int parse_target_str(struct perf_kvm_stat *kvm)
1125 {
1126         if (kvm->opts.target.pid) {
1127                 kvm->pid_list = intlist__new(kvm->opts.target.pid);
1128                 if (kvm->pid_list == NULL) {
1129                         pr_err("Error parsing process id string\n");
1130                         return -EINVAL;
1131                 }
1132         }
1133
1134         return 0;
1135 }
1136
1137 static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
1138 {
1139         int ret = -EINVAL;
1140         int vcpu = kvm->trace_vcpu;
1141
1142         if (parse_target_str(kvm) != 0)
1143                 goto exit;
1144
1145         if (!verify_vcpu(vcpu))
1146                 goto exit;
1147
1148         if (!select_key(kvm))
1149                 goto exit;
1150
1151         if (!register_kvm_events_ops(kvm))
1152                 goto exit;
1153
1154         init_kvm_event_record(kvm);
1155         setup_pager();
1156
1157         ret = read_events(kvm);
1158         if (ret)
1159                 goto exit;
1160
1161         sort_result(kvm);
1162         print_result(kvm);
1163
1164 exit:
1165         return ret;
1166 }
1167
1168 #define STRDUP_FAIL_EXIT(s)             \
1169         ({      char *_p;               \
1170         _p = strdup(s);         \
1171                 if (!_p)                \
1172                         return -ENOMEM; \
1173                 _p;                     \
1174         })
1175
1176 int __weak setup_kvm_events_tp(struct perf_kvm_stat *kvm __maybe_unused)
1177 {
1178         return 0;
1179 }
1180
1181 static int
1182 kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
1183 {
1184         unsigned int rec_argc, i, j, events_tp_size;
1185         const char **rec_argv;
1186         const char * const record_args[] = {
1187                 "record",
1188                 "-R",
1189                 "-m", "1024",
1190                 "-c", "1",
1191         };
1192         const char * const kvm_stat_record_usage[] = {
1193                 "perf kvm stat record [<options>]",
1194                 NULL
1195         };
1196         const char * const *events_tp;
1197         int ret;
1198
1199         events_tp_size = 0;
1200         ret = setup_kvm_events_tp(kvm);
1201         if (ret < 0) {
1202                 pr_err("Unable to setup the kvm tracepoints\n");
1203                 return ret;
1204         }
1205
1206         for (events_tp = kvm_events_tp; *events_tp; events_tp++)
1207                 events_tp_size++;
1208
1209         rec_argc = ARRAY_SIZE(record_args) + argc + 2 +
1210                    2 * events_tp_size;
1211         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1212
1213         if (rec_argv == NULL)
1214                 return -ENOMEM;
1215
1216         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1217                 rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);
1218
1219         for (j = 0; j < events_tp_size; j++) {
1220                 rec_argv[i++] = "-e";
1221                 rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]);
1222         }
1223
1224         rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
1225         rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);
1226
1227         for (j = 1; j < (unsigned int)argc; j++, i++)
1228                 rec_argv[i] = argv[j];
1229
1230         set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
1231         set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
1232         set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);
1233
1234         set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
1235         set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
1236         set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
1237         set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
1238         set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
1239         set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
1240         set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
1241         set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
1242         set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
1243         set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
1244         set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
1245         set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
1246         set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
1247         set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
1248         set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
1249
1250         record_usage = kvm_stat_record_usage;
1251         return cmd_record(i, rec_argv);
1252 }
1253
1254 static int
1255 kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
1256 {
1257         const struct option kvm_events_report_options[] = {
1258                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1259                            "event for reporting: vmexit, "
1260                            "mmio (x86 only), ioport (x86 only)"),
1261                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1262                             "vcpu id to report"),
1263                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1264                             "key for sorting: sample(sort by samples number)"
1265                             " time (sort by avg time)"),
1266                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1267                            "analyze events only for given process id(s)"),
1268                 OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"),
1269                 OPT_END()
1270         };
1271
1272         const char * const kvm_events_report_usage[] = {
1273                 "perf kvm stat report [<options>]",
1274                 NULL
1275         };
1276
1277         if (argc) {
1278                 argc = parse_options(argc, argv,
1279                                      kvm_events_report_options,
1280                                      kvm_events_report_usage, 0);
1281                 if (argc)
1282                         usage_with_options(kvm_events_report_usage,
1283                                            kvm_events_report_options);
1284         }
1285
1286         if (!kvm->opts.target.pid)
1287                 kvm->opts.target.system_wide = true;
1288
1289         return kvm_events_report_vcpu(kvm);
1290 }
1291
1292 #ifdef HAVE_TIMERFD_SUPPORT
1293 static struct evlist *kvm_live_event_list(void)
1294 {
1295         struct evlist *evlist;
1296         char *tp, *name, *sys;
1297         int err = -1;
1298         const char * const *events_tp;
1299
1300         evlist = evlist__new();
1301         if (evlist == NULL)
1302                 return NULL;
1303
1304         for (events_tp = kvm_events_tp; *events_tp; events_tp++) {
1305
1306                 tp = strdup(*events_tp);
1307                 if (tp == NULL)
1308                         goto out;
1309
1310                 /* split tracepoint into subsystem and name */
1311                 sys = tp;
1312                 name = strchr(tp, ':');
1313                 if (name == NULL) {
1314                         pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n",
1315                                *events_tp);
1316                         free(tp);
1317                         goto out;
1318                 }
1319                 *name = '\0';
1320                 name++;
1321
1322                 if (evlist__add_newtp(evlist, sys, name, NULL)) {
1323                         pr_err("Failed to add %s tracepoint to the list\n", *events_tp);
1324                         free(tp);
1325                         goto out;
1326                 }
1327
1328                 free(tp);
1329         }
1330
1331         err = 0;
1332
1333 out:
1334         if (err) {
1335                 evlist__delete(evlist);
1336                 evlist = NULL;
1337         }
1338
1339         return evlist;
1340 }
1341
1342 static int kvm_events_live(struct perf_kvm_stat *kvm,
1343                            int argc, const char **argv)
1344 {
1345         char errbuf[BUFSIZ];
1346         int err;
1347
1348         const struct option live_options[] = {
1349                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1350                         "record events on existing process id"),
1351                 OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
1352                         "number of mmap data pages",
1353                         perf_evlist__parse_mmap_pages),
1354                 OPT_INCR('v', "verbose", &verbose,
1355                         "be more verbose (show counter open errors, etc)"),
1356                 OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
1357                         "system-wide collection from all CPUs"),
1358                 OPT_UINTEGER('d', "display", &kvm->display_time,
1359                         "time in seconds between display updates"),
1360                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1361                         "event for reporting: "
1362                         "vmexit, mmio (x86 only), ioport (x86 only)"),
1363                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1364                         "vcpu id to report"),
1365                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1366                         "key for sorting: sample(sort by samples number)"
1367                         " time (sort by avg time)"),
1368                 OPT_U64(0, "duration", &kvm->duration,
1369                         "show events other than"
1370                         " HLT (x86 only) or Wait state (s390 only)"
1371                         " that take longer than duration usecs"),
1372                 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
1373                                 "per thread proc mmap processing timeout in ms"),
1374                 OPT_END()
1375         };
1376         const char * const live_usage[] = {
1377                 "perf kvm stat live [<options>]",
1378                 NULL
1379         };
1380         struct perf_data data = {
1381                 .mode = PERF_DATA_MODE_WRITE,
1382         };
1383
1384
1385         /* event handling */
1386         kvm->tool.sample = process_sample_event;
1387         kvm->tool.comm   = perf_event__process_comm;
1388         kvm->tool.exit   = perf_event__process_exit;
1389         kvm->tool.fork   = perf_event__process_fork;
1390         kvm->tool.lost   = process_lost_event;
1391         kvm->tool.namespaces  = perf_event__process_namespaces;
1392         kvm->tool.ordered_events = true;
1393         perf_tool__fill_defaults(&kvm->tool);
1394
1395         /* set defaults */
1396         kvm->display_time = 1;
1397         kvm->opts.user_interval = 1;
1398         kvm->opts.mmap_pages = 512;
1399         kvm->opts.target.uses_mmap = false;
1400         kvm->opts.target.uid_str = NULL;
1401         kvm->opts.target.uid = UINT_MAX;
1402
1403         symbol__init(NULL);
1404         disable_buildid_cache();
1405
1406         use_browser = 0;
1407
1408         if (argc) {
1409                 argc = parse_options(argc, argv, live_options,
1410                                      live_usage, 0);
1411                 if (argc)
1412                         usage_with_options(live_usage, live_options);
1413         }
1414
1415         kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */
1416
1417         /*
1418          * target related setups
1419          */
1420         err = target__validate(&kvm->opts.target);
1421         if (err) {
1422                 target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ);
1423                 ui__warning("%s", errbuf);
1424         }
1425
1426         if (target__none(&kvm->opts.target))
1427                 kvm->opts.target.system_wide = true;
1428
1429
1430         /*
1431          * generate the event list
1432          */
1433         err = setup_kvm_events_tp(kvm);
1434         if (err < 0) {
1435                 pr_err("Unable to setup the kvm tracepoints\n");
1436                 return err;
1437         }
1438
1439         kvm->evlist = kvm_live_event_list();
1440         if (kvm->evlist == NULL) {
1441                 err = -1;
1442                 goto out;
1443         }
1444
1445         if (perf_evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0)
1446                 usage_with_options(live_usage, live_options);
1447
1448         /*
1449          * perf session
1450          */
1451         kvm->session = perf_session__new(&data, false, &kvm->tool);
1452         if (IS_ERR(kvm->session)) {
1453                 err = PTR_ERR(kvm->session);
1454                 goto out;
1455         }
1456         kvm->session->evlist = kvm->evlist;
1457         perf_session__set_id_hdr_size(kvm->session);
1458         ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
1459         machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
1460                                     kvm->evlist->core.threads, false, 1);
1461         err = kvm_live_open_events(kvm);
1462         if (err)
1463                 goto out;
1464
1465         err = kvm_events_live_report(kvm);
1466
1467 out:
1468         perf_session__delete(kvm->session);
1469         kvm->session = NULL;
1470         evlist__delete(kvm->evlist);
1471
1472         return err;
1473 }
1474 #endif
1475
1476 static void print_kvm_stat_usage(void)
1477 {
1478         printf("Usage: perf kvm stat <command>\n\n");
1479
1480         printf("# Available commands:\n");
1481         printf("\trecord: record kvm events\n");
1482         printf("\treport: report statistical data of kvm events\n");
1483         printf("\tlive:   live reporting of statistical data of kvm events\n");
1484
1485         printf("\nOtherwise, it is the alias of 'perf stat':\n");
1486 }
1487
1488 static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
1489 {
1490         struct perf_kvm_stat kvm = {
1491                 .file_name = file_name,
1492
1493                 .trace_vcpu     = -1,
1494                 .report_event   = "vmexit",
1495                 .sort_key       = "sample",
1496
1497         };
1498
1499         if (argc == 1) {
1500                 print_kvm_stat_usage();
1501                 goto perf_stat;
1502         }
1503
1504         if (!strncmp(argv[1], "rec", 3))
1505                 return kvm_events_record(&kvm, argc - 1, argv + 1);
1506
1507         if (!strncmp(argv[1], "rep", 3))
1508                 return kvm_events_report(&kvm, argc - 1 , argv + 1);
1509
1510 #ifdef HAVE_TIMERFD_SUPPORT
1511         if (!strncmp(argv[1], "live", 4))
1512                 return kvm_events_live(&kvm, argc - 1 , argv + 1);
1513 #endif
1514
1515 perf_stat:
1516         return cmd_stat(argc, argv);
1517 }
1518 #endif /* HAVE_KVM_STAT_SUPPORT */
1519
1520 int __weak kvm_add_default_arch_event(int *argc __maybe_unused,
1521                                         const char **argv __maybe_unused)
1522 {
1523         return 0;
1524 }
1525
1526 static int __cmd_record(const char *file_name, int argc, const char **argv)
1527 {
1528         int rec_argc, i = 0, j, ret;
1529         const char **rec_argv;
1530
1531         ret = kvm_add_default_arch_event(&argc, argv);
1532         if (ret)
1533                 return -EINVAL;
1534
1535         rec_argc = argc + 2;
1536         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1537         rec_argv[i++] = strdup("record");
1538         rec_argv[i++] = strdup("-o");
1539         rec_argv[i++] = strdup(file_name);
1540         for (j = 1; j < argc; j++, i++)
1541                 rec_argv[i] = argv[j];
1542
1543         BUG_ON(i != rec_argc);
1544
1545         return cmd_record(i, rec_argv);
1546 }
1547
1548 static int __cmd_report(const char *file_name, int argc, const char **argv)
1549 {
1550         int rec_argc, i = 0, j;
1551         const char **rec_argv;
1552
1553         rec_argc = argc + 2;
1554         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1555         rec_argv[i++] = strdup("report");
1556         rec_argv[i++] = strdup("-i");
1557         rec_argv[i++] = strdup(file_name);
1558         for (j = 1; j < argc; j++, i++)
1559                 rec_argv[i] = argv[j];
1560
1561         BUG_ON(i != rec_argc);
1562
1563         return cmd_report(i, rec_argv);
1564 }
1565
1566 static int
1567 __cmd_buildid_list(const char *file_name, int argc, const char **argv)
1568 {
1569         int rec_argc, i = 0, j;
1570         const char **rec_argv;
1571
1572         rec_argc = argc + 2;
1573         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1574         rec_argv[i++] = strdup("buildid-list");
1575         rec_argv[i++] = strdup("-i");
1576         rec_argv[i++] = strdup(file_name);
1577         for (j = 1; j < argc; j++, i++)
1578                 rec_argv[i] = argv[j];
1579
1580         BUG_ON(i != rec_argc);
1581
1582         return cmd_buildid_list(i, rec_argv);
1583 }
1584
1585 int cmd_kvm(int argc, const char **argv)
1586 {
1587         const char *file_name = NULL;
1588         const struct option kvm_options[] = {
1589                 OPT_STRING('i', "input", &file_name, "file",
1590                            "Input file name"),
1591                 OPT_STRING('o', "output", &file_name, "file",
1592                            "Output file name"),
1593                 OPT_BOOLEAN(0, "guest", &perf_guest,
1594                             "Collect guest os data"),
1595                 OPT_BOOLEAN(0, "host", &perf_host,
1596                             "Collect host os data"),
1597                 OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
1598                            "guest mount directory under which every guest os"
1599                            " instance has a subdir"),
1600                 OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
1601                            "file", "file saving guest os vmlinux"),
1602                 OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
1603                            "file", "file saving guest os /proc/kallsyms"),
1604                 OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
1605                            "file", "file saving guest os /proc/modules"),
1606                 OPT_INCR('v', "verbose", &verbose,
1607                             "be more verbose (show counter open errors, etc)"),
1608                 OPT_END()
1609         };
1610
1611         const char *const kvm_subcommands[] = { "top", "record", "report", "diff",
1612                                                 "buildid-list", "stat", NULL };
1613         const char *kvm_usage[] = { NULL, NULL };
1614
1615         perf_host  = 0;
1616         perf_guest = 1;
1617
1618         argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, kvm_usage,
1619                                         PARSE_OPT_STOP_AT_NON_OPTION);
1620         if (!argc)
1621                 usage_with_options(kvm_usage, kvm_options);
1622
1623         if (!perf_host)
1624                 perf_guest = 1;
1625
1626         if (!file_name) {
1627                 file_name = get_filename_for_perf_kvm();
1628
1629                 if (!file_name) {
1630                         pr_err("Failed to allocate memory for filename\n");
1631                         return -ENOMEM;
1632                 }
1633         }
1634
1635         if (!strncmp(argv[0], "rec", 3))
1636                 return __cmd_record(file_name, argc, argv);
1637         else if (!strncmp(argv[0], "rep", 3))
1638                 return __cmd_report(file_name, argc, argv);
1639         else if (!strncmp(argv[0], "diff", 4))
1640                 return cmd_diff(argc, argv);
1641         else if (!strncmp(argv[0], "top", 3))
1642                 return cmd_top(argc, argv);
1643         else if (!strncmp(argv[0], "buildid-list", 12))
1644                 return __cmd_buildid_list(file_name, argc, argv);
1645 #ifdef HAVE_KVM_STAT_SUPPORT
1646         else if (!strncmp(argv[0], "stat", 4))
1647                 return kvm_cmd_stat(file_name, argc, argv);
1648 #endif
1649         else
1650                 usage_with_options(kvm_usage, kvm_options);
1651
1652         return 0;
1653 }