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TOMOYO Linux Cross Reference
Linux/tools/perf/builtin-kvm.c

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Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

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