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

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  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 = perf_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 = perf_evsel__intval(evsel, sample,
420                                                           vcpu_id_str);
421                 thread__set_priv(thread, vcpu_record);
422         }
423 
424         return thread__priv(thread);
425 }
426 
427 static bool handle_kvm_event(struct perf_kvm_stat *kvm,
428                              struct thread *thread,
429                              struct evsel *evsel,
430                              struct perf_sample *sample)
431 {
432         struct vcpu_event_record *vcpu_record;
433         struct event_key key = { .key = INVALID_KEY,
434                                  .exit_reasons = kvm->exit_reasons };
435 
436         vcpu_record = per_vcpu_record(thread, evsel, sample);
437         if (!vcpu_record)
438                 return true;
439 
440         /* only process events for vcpus user cares about */
441         if ((kvm->trace_vcpu != -1) &&
442             (kvm->trace_vcpu != vcpu_record->vcpu_id))
443                 return true;
444 
445         if (kvm->events_ops->is_begin_event(evsel, sample, &key))
446                 return handle_begin_event(kvm, vcpu_record, &key, sample->time);
447 
448         if (is_child_event(kvm, evsel, sample, &key))
449                 return handle_child_event(kvm, vcpu_record, &key, sample);
450 
451         if (kvm->events_ops->is_end_event(evsel, sample, &key))
452                 return handle_end_event(kvm, vcpu_record, &key, sample);
453 
454         return true;
455 }
456 
457 #define GET_EVENT_KEY(func, field)                                      \
458 static u64 get_event_ ##func(struct kvm_event *event, int vcpu)         \
459 {                                                                       \
460         if (vcpu == -1)                                                 \
461                 return event->total.field;                              \
462                                                                         \
463         if (vcpu >= event->max_vcpu)                                    \
464                 return 0;                                               \
465                                                                         \
466         return event->vcpu[vcpu].field;                                 \
467 }
468 
469 #define COMPARE_EVENT_KEY(func, field)                                  \
470 GET_EVENT_KEY(func, field)                                              \
471 static int compare_kvm_event_ ## func(struct kvm_event *one,            \
472                                         struct kvm_event *two, int vcpu)\
473 {                                                                       \
474         return get_event_ ##func(one, vcpu) >                           \
475                                 get_event_ ##func(two, vcpu);           \
476 }
477 
478 GET_EVENT_KEY(time, time);
479 COMPARE_EVENT_KEY(count, stats.n);
480 COMPARE_EVENT_KEY(mean, stats.mean);
481 GET_EVENT_KEY(max, stats.max);
482 GET_EVENT_KEY(min, stats.min);
483 
484 #define DEF_SORT_NAME_KEY(name, compare_key)                            \
485         { #name, compare_kvm_event_ ## compare_key }
486 
487 static struct kvm_event_key keys[] = {
488         DEF_SORT_NAME_KEY(sample, count),
489         DEF_SORT_NAME_KEY(time, mean),
490         { NULL, NULL }
491 };
492 
493 static bool select_key(struct perf_kvm_stat *kvm)
494 {
495         int i;
496 
497         for (i = 0; keys[i].name; i++) {
498                 if (!strcmp(keys[i].name, kvm->sort_key)) {
499                         kvm->compare = keys[i].key;
500                         return true;
501                 }
502         }
503 
504         pr_err("Unknown compare key:%s\n", kvm->sort_key);
505         return false;
506 }
507 
508 static void insert_to_result(struct rb_root *result, struct kvm_event *event,
509                              key_cmp_fun bigger, int vcpu)
510 {
511         struct rb_node **rb = &result->rb_node;
512         struct rb_node *parent = NULL;
513         struct kvm_event *p;
514 
515         while (*rb) {
516                 p = container_of(*rb, struct kvm_event, rb);
517                 parent = *rb;
518 
519                 if (bigger(event, p, vcpu))
520                         rb = &(*rb)->rb_left;
521                 else
522                         rb = &(*rb)->rb_right;
523         }
524 
525         rb_link_node(&event->rb, parent, rb);
526         rb_insert_color(&event->rb, result);
527 }
528 
529 static void
530 update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event)
531 {
532         int vcpu = kvm->trace_vcpu;
533 
534         kvm->total_count += get_event_count(event, vcpu);
535         kvm->total_time += get_event_time(event, vcpu);
536 }
537 
538 static bool event_is_valid(struct kvm_event *event, int vcpu)
539 {
540         return !!get_event_count(event, vcpu);
541 }
542 
543 static void sort_result(struct perf_kvm_stat *kvm)
544 {
545         unsigned int i;
546         int vcpu = kvm->trace_vcpu;
547         struct kvm_event *event;
548 
549         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
550                 list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) {
551                         if (event_is_valid(event, vcpu)) {
552                                 update_total_count(kvm, event);
553                                 insert_to_result(&kvm->result, event,
554                                                  kvm->compare, vcpu);
555                         }
556                 }
557         }
558 }
559 
560 /* returns left most element of result, and erase it */
561 static struct kvm_event *pop_from_result(struct rb_root *result)
562 {
563         struct rb_node *node = rb_first(result);
564 
565         if (!node)
566                 return NULL;
567 
568         rb_erase(node, result);
569         return container_of(node, struct kvm_event, rb);
570 }
571 
572 static void print_vcpu_info(struct perf_kvm_stat *kvm)
573 {
574         int vcpu = kvm->trace_vcpu;
575 
576         pr_info("Analyze events for ");
577 
578         if (kvm->opts.target.system_wide)
579                 pr_info("all VMs, ");
580         else if (kvm->opts.target.pid)
581                 pr_info("pid(s) %s, ", kvm->opts.target.pid);
582         else
583                 pr_info("dazed and confused on what is monitored, ");
584 
585         if (vcpu == -1)
586                 pr_info("all VCPUs:\n\n");
587         else
588                 pr_info("VCPU %d:\n\n", vcpu);
589 }
590 
591 static void show_timeofday(void)
592 {
593         char date[64];
594         struct timeval tv;
595         struct tm ltime;
596 
597         gettimeofday(&tv, NULL);
598         if (localtime_r(&tv.tv_sec, &ltime)) {
599                 strftime(date, sizeof(date), "%H:%M:%S", &ltime);
600                 pr_info("%s.%06ld", date, tv.tv_usec);
601         } else
602                 pr_info("00:00:00.000000");
603 
604         return;
605 }
606 
607 static void print_result(struct perf_kvm_stat *kvm)
608 {
609         char decode[decode_str_len];
610         struct kvm_event *event;
611         int vcpu = kvm->trace_vcpu;
612 
613         if (kvm->live) {
614                 puts(CONSOLE_CLEAR);
615                 show_timeofday();
616         }
617 
618         pr_info("\n\n");
619         print_vcpu_info(kvm);
620         pr_info("%*s ", decode_str_len, kvm->events_ops->name);
621         pr_info("%10s ", "Samples");
622         pr_info("%9s ", "Samples%");
623 
624         pr_info("%9s ", "Time%");
625         pr_info("%11s ", "Min Time");
626         pr_info("%11s ", "Max Time");
627         pr_info("%16s ", "Avg time");
628         pr_info("\n\n");
629 
630         while ((event = pop_from_result(&kvm->result))) {
631                 u64 ecount, etime, max, min;
632 
633                 ecount = get_event_count(event, vcpu);
634                 etime = get_event_time(event, vcpu);
635                 max = get_event_max(event, vcpu);
636                 min = get_event_min(event, vcpu);
637 
638                 kvm->events_ops->decode_key(kvm, &event->key, decode);
639                 pr_info("%*s ", decode_str_len, decode);
640                 pr_info("%10llu ", (unsigned long long)ecount);
641                 pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
642                 pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
643                 pr_info("%9.2fus ", (double)min / NSEC_PER_USEC);
644                 pr_info("%9.2fus ", (double)max / NSEC_PER_USEC);
645                 pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount / NSEC_PER_USEC,
646                         kvm_event_rel_stddev(vcpu, event));
647                 pr_info("\n");
648         }
649 
650         pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n",
651                 kvm->total_count, kvm->total_time / (double)NSEC_PER_USEC);
652 
653         if (kvm->lost_events)
654                 pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events);
655 }
656 
657 #ifdef HAVE_TIMERFD_SUPPORT
658 static int process_lost_event(struct perf_tool *tool,
659                               union perf_event *event __maybe_unused,
660                               struct perf_sample *sample __maybe_unused,
661                               struct machine *machine __maybe_unused)
662 {
663         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, tool);
664 
665         kvm->lost_events++;
666         return 0;
667 }
668 #endif
669 
670 static bool skip_sample(struct perf_kvm_stat *kvm,
671                         struct perf_sample *sample)
672 {
673         if (kvm->pid_list && intlist__find(kvm->pid_list, sample->pid) == NULL)
674                 return true;
675 
676         return false;
677 }
678 
679 static int process_sample_event(struct perf_tool *tool,
680                                 union perf_event *event,
681                                 struct perf_sample *sample,
682                                 struct evsel *evsel,
683                                 struct machine *machine)
684 {
685         int err = 0;
686         struct thread *thread;
687         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat,
688                                                  tool);
689 
690         if (skip_sample(kvm, sample))
691                 return 0;
692 
693         thread = machine__findnew_thread(machine, sample->pid, sample->tid);
694         if (thread == NULL) {
695                 pr_debug("problem processing %d event, skipping it.\n",
696                         event->header.type);
697                 return -1;
698         }
699 
700         if (!handle_kvm_event(kvm, thread, evsel, sample))
701                 err = -1;
702 
703         thread__put(thread);
704         return err;
705 }
706 
707 static int cpu_isa_config(struct perf_kvm_stat *kvm)
708 {
709         char buf[128], *cpuid;
710         int err;
711 
712         if (kvm->live) {
713                 err = get_cpuid(buf, sizeof(buf));
714                 if (err != 0) {
715                         pr_err("Failed to look up CPU type: %s\n",
716                                str_error_r(err, buf, sizeof(buf)));
717                         return -err;
718                 }
719                 cpuid = buf;
720         } else
721                 cpuid = kvm->session->header.env.cpuid;
722 
723         if (!cpuid) {
724                 pr_err("Failed to look up CPU type\n");
725                 return -EINVAL;
726         }
727 
728         err = cpu_isa_init(kvm, cpuid);
729         if (err == -ENOTSUP)
730                 pr_err("CPU %s is not supported.\n", cpuid);
731 
732         return err;
733 }
734 
735 static bool verify_vcpu(int vcpu)
736 {
737         if (vcpu != -1 && vcpu < 0) {
738                 pr_err("Invalid vcpu:%d.\n", vcpu);
739                 return false;
740         }
741 
742         return true;
743 }
744 
745 #ifdef HAVE_TIMERFD_SUPPORT
746 /* keeping the max events to a modest level to keep
747  * the processing of samples per mmap smooth.
748  */
749 #define PERF_KVM__MAX_EVENTS_PER_MMAP  25
750 
751 static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
752                                    u64 *mmap_time)
753 {
754         struct evlist *evlist = kvm->evlist;
755         union perf_event *event;
756         struct mmap *md;
757         u64 timestamp;
758         s64 n = 0;
759         int err;
760 
761         *mmap_time = ULLONG_MAX;
762         md = &evlist->mmap[idx];
763         err = perf_mmap__read_init(&md->core);
764         if (err < 0)
765                 return (err == -EAGAIN) ? 0 : -1;
766 
767         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
768                 err = perf_evlist__parse_sample_timestamp(evlist, event, &timestamp);
769                 if (err) {
770                         perf_mmap__consume(&md->core);
771                         pr_err("Failed to parse sample\n");
772                         return -1;
773                 }
774 
775                 err = perf_session__queue_event(kvm->session, event, timestamp, 0);
776                 /*
777                  * FIXME: Here we can't consume the event, as perf_session__queue_event will
778                  *        point to it, and it'll get possibly overwritten by the kernel.
779                  */
780                 perf_mmap__consume(&md->core);
781 
782                 if (err) {
783                         pr_err("Failed to enqueue sample: %d\n", err);
784                         return -1;
785                 }
786 
787                 /* save time stamp of our first sample for this mmap */
788                 if (n == 0)
789                         *mmap_time = timestamp;
790 
791                 /* limit events per mmap handled all at once */
792                 n++;
793                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
794                         break;
795         }
796 
797         perf_mmap__read_done(&md->core);
798         return n;
799 }
800 
801 static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm)
802 {
803         int i, err, throttled = 0;
804         s64 n, ntotal = 0;
805         u64 flush_time = ULLONG_MAX, mmap_time;
806 
807         for (i = 0; i < kvm->evlist->core.nr_mmaps; i++) {
808                 n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time);
809                 if (n < 0)
810                         return -1;
811 
812                 /* flush time is going to be the minimum of all the individual
813                  * mmap times. Essentially, we flush all the samples queued up
814                  * from the last pass under our minimal start time -- that leaves
815                  * a very small race for samples to come in with a lower timestamp.
816                  * The ioctl to return the perf_clock timestamp should close the
817                  * race entirely.
818                  */
819                 if (mmap_time < flush_time)
820                         flush_time = mmap_time;
821 
822                 ntotal += n;
823                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
824                         throttled = 1;
825         }
826 
827         /* flush queue after each round in which we processed events */
828         if (ntotal) {
829                 struct ordered_events *oe = &kvm->session->ordered_events;
830 
831                 oe->next_flush = flush_time;
832                 err = ordered_events__flush(oe, OE_FLUSH__ROUND);
833                 if (err) {
834                         if (kvm->lost_events)
835                                 pr_info("\nLost events: %" PRIu64 "\n\n",
836                                         kvm->lost_events);
837                         return err;
838                 }
839         }
840 
841         return throttled;
842 }
843 
844 static volatile int done;
845 
846 static void sig_handler(int sig __maybe_unused)
847 {
848         done = 1;
849 }
850 
851 static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm)
852 {
853         struct itimerspec new_value;
854         int rc = -1;
855 
856         kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
857         if (kvm->timerfd < 0) {
858                 pr_err("timerfd_create failed\n");
859                 goto out;
860         }
861 
862         new_value.it_value.tv_sec = kvm->display_time;
863         new_value.it_value.tv_nsec = 0;
864         new_value.it_interval.tv_sec = kvm->display_time;
865         new_value.it_interval.tv_nsec = 0;
866 
867         if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) {
868                 pr_err("timerfd_settime failed: %d\n", errno);
869                 close(kvm->timerfd);
870                 goto out;
871         }
872 
873         rc = 0;
874 out:
875         return rc;
876 }
877 
878 static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
879 {
880         uint64_t c;
881         int rc;
882 
883         rc = read(kvm->timerfd, &c, sizeof(uint64_t));
884         if (rc < 0) {
885                 if (errno == EAGAIN)
886                         return 0;
887 
888                 pr_err("Failed to read timer fd: %d\n", errno);
889                 return -1;
890         }
891 
892         if (rc != sizeof(uint64_t)) {
893                 pr_err("Error reading timer fd - invalid size returned\n");
894                 return -1;
895         }
896 
897         if (c != 1)
898                 pr_debug("Missed timer beats: %" PRIu64 "\n", c-1);
899 
900         /* update display */
901         sort_result(kvm);
902         print_result(kvm);
903 
904         /* reset counts */
905         clear_events_cache_stats(kvm->kvm_events_cache);
906         kvm->total_count = 0;
907         kvm->total_time = 0;
908         kvm->lost_events = 0;
909 
910         return 0;
911 }
912 
913 static int fd_set_nonblock(int fd)
914 {
915         long arg = 0;
916 
917         arg = fcntl(fd, F_GETFL);
918         if (arg < 0) {
919                 pr_err("Failed to get current flags for fd %d\n", fd);
920                 return -1;
921         }
922 
923         if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) {
924                 pr_err("Failed to set non-block option on fd %d\n", fd);
925                 return -1;
926         }
927 
928         return 0;
929 }
930 
931 static int perf_kvm__handle_stdin(void)
932 {
933         int c;
934 
935         c = getc(stdin);
936         if (c == 'q')
937                 return 1;
938 
939         return 0;
940 }
941 
942 static int kvm_events_live_report(struct perf_kvm_stat *kvm)
943 {
944         int nr_stdin, ret, err = -EINVAL;
945         struct termios save;
946 
947         /* live flag must be set first */
948         kvm->live = true;
949 
950         ret = cpu_isa_config(kvm);
951         if (ret < 0)
952                 return ret;
953 
954         if (!verify_vcpu(kvm->trace_vcpu) ||
955             !select_key(kvm) ||
956             !register_kvm_events_ops(kvm)) {
957                 goto out;
958         }
959 
960         set_term_quiet_input(&save);
961         init_kvm_event_record(kvm);
962 
963         signal(SIGINT, sig_handler);
964         signal(SIGTERM, sig_handler);
965 
966         /* add timer fd */
967         if (perf_kvm__timerfd_create(kvm) < 0) {
968                 err = -1;
969                 goto out;
970         }
971 
972         if (evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
973                 goto out;
974 
975         nr_stdin = evlist__add_pollfd(kvm->evlist, fileno(stdin));
976         if (nr_stdin < 0)
977                 goto out;
978 
979         if (fd_set_nonblock(fileno(stdin)) != 0)
980                 goto out;
981 
982         /* everything is good - enable the events and process */
983         evlist__enable(kvm->evlist);
984 
985         while (!done) {
986                 struct fdarray *fda = &kvm->evlist->core.pollfd;
987                 int rc;
988 
989                 rc = perf_kvm__mmap_read(kvm);
990                 if (rc < 0)
991                         break;
992 
993                 err = perf_kvm__handle_timerfd(kvm);
994                 if (err)
995                         goto out;
996 
997                 if (fda->entries[nr_stdin].revents & POLLIN)
998                         done = perf_kvm__handle_stdin();
999 
1000                 if (!rc && !done)
1001                         err = evlist__poll(kvm->evlist, 100);
1002         }
1003 
1004         evlist__disable(kvm->evlist);
1005 
1006         if (err == 0) {
1007                 sort_result(kvm);
1008                 print_result(kvm);
1009         }
1010 
1011 out:
1012         if (kvm->timerfd >= 0)
1013                 close(kvm->timerfd);
1014 
1015         tcsetattr(0, TCSAFLUSH, &save);
1016         return err;
1017 }
1018 
1019 static int kvm_live_open_events(struct perf_kvm_stat *kvm)
1020 {
1021         int err, rc = -1;
1022         struct evsel *pos;
1023         struct evlist *evlist = kvm->evlist;
1024         char sbuf[STRERR_BUFSIZE];
1025 
1026         perf_evlist__config(evlist, &kvm->opts, NULL);
1027 
1028         /*
1029          * Note: exclude_{guest,host} do not apply here.
1030          *       This command processes KVM tracepoints from host only
1031          */
1032         evlist__for_each_entry(evlist, pos) {
1033                 struct perf_event_attr *attr = &pos->core.attr;
1034 
1035                 /* make sure these *are* set */
1036                 perf_evsel__set_sample_bit(pos, TID);
1037                 perf_evsel__set_sample_bit(pos, TIME);
1038                 perf_evsel__set_sample_bit(pos, CPU);
1039                 perf_evsel__set_sample_bit(pos, RAW);
1040                 /* make sure these are *not*; want as small a sample as possible */
1041                 perf_evsel__reset_sample_bit(pos, PERIOD);
1042                 perf_evsel__reset_sample_bit(pos, IP);
1043                 perf_evsel__reset_sample_bit(pos, CALLCHAIN);
1044                 perf_evsel__reset_sample_bit(pos, ADDR);
1045                 perf_evsel__reset_sample_bit(pos, READ);
1046                 attr->mmap = 0;
1047                 attr->comm = 0;
1048                 attr->task = 0;
1049 
1050                 attr->sample_period = 1;
1051 
1052                 attr->watermark = 0;
1053                 attr->wakeup_events = 1000;
1054 
1055                 /* will enable all once we are ready */
1056                 attr->disabled = 1;
1057         }
1058 
1059         err = evlist__open(evlist);
1060         if (err < 0) {
1061                 printf("Couldn't create the events: %s\n",
1062                        str_error_r(errno, sbuf, sizeof(sbuf)));
1063                 goto out;
1064         }
1065 
1066         if (evlist__mmap(evlist, kvm->opts.mmap_pages) < 0) {
1067                 ui__error("Failed to mmap the events: %s\n",
1068                           str_error_r(errno, sbuf, sizeof(sbuf)));
1069                 evlist__close(evlist);
1070                 goto out;
1071         }
1072 
1073         rc = 0;
1074 
1075 out:
1076         return rc;
1077 }
1078 #endif
1079 
1080 static int read_events(struct perf_kvm_stat *kvm)
1081 {
1082         int ret;
1083 
1084         struct perf_tool eops = {
1085                 .sample                 = process_sample_event,
1086                 .comm                   = perf_event__process_comm,
1087                 .namespaces             = perf_event__process_namespaces,
1088                 .ordered_events         = true,
1089         };
1090         struct perf_data file = {
1091                 .path  = kvm->file_name,
1092                 .mode  = PERF_DATA_MODE_READ,
1093                 .force = kvm->force,
1094         };
1095 
1096         kvm->tool = eops;
1097         kvm->session = perf_session__new(&file, false, &kvm->tool);
1098         if (IS_ERR(kvm->session)) {
1099                 pr_err("Initializing perf session failed\n");
1100                 return PTR_ERR(kvm->session);
1101         }
1102 
1103         symbol__init(&kvm->session->header.env);
1104 
1105         if (!perf_session__has_traces(kvm->session, "kvm record")) {
1106                 ret = -EINVAL;
1107                 goto out_delete;
1108         }
1109 
1110         /*
1111          * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
1112          * traced in the old kernel.
1113          */
1114         ret = cpu_isa_config(kvm);
1115         if (ret < 0)
1116                 goto out_delete;
1117 
1118         ret = perf_session__process_events(kvm->session);
1119 
1120 out_delete:
1121         perf_session__delete(kvm->session);
1122         return ret;
1123 }
1124 
1125 static int parse_target_str(struct perf_kvm_stat *kvm)
1126 {
1127         if (kvm->opts.target.pid) {
1128                 kvm->pid_list = intlist__new(kvm->opts.target.pid);
1129                 if (kvm->pid_list == NULL) {
1130                         pr_err("Error parsing process id string\n");
1131                         return -EINVAL;
1132                 }
1133         }
1134 
1135         return 0;
1136 }
1137 
1138 static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
1139 {
1140         int ret = -EINVAL;
1141         int vcpu = kvm->trace_vcpu;
1142 
1143         if (parse_target_str(kvm) != 0)
1144                 goto exit;
1145 
1146         if (!verify_vcpu(vcpu))
1147                 goto exit;
1148 
1149         if (!select_key(kvm))
1150                 goto exit;
1151 
1152         if (!register_kvm_events_ops(kvm))
1153                 goto exit;
1154 
1155         init_kvm_event_record(kvm);
1156         setup_pager();
1157 
1158         ret = read_events(kvm);
1159         if (ret)
1160                 goto exit;
1161 
1162         sort_result(kvm);
1163         print_result(kvm);
1164 
1165 exit:
1166         return ret;
1167 }
1168 
1169 #define STRDUP_FAIL_EXIT(s)             \
1170         ({      char *_p;               \
1171         _p = strdup(s);         \
1172                 if (!_p)                \
1173                         return -ENOMEM; \
1174                 _p;                     \
1175         })
1176 
1177 int __weak setup_kvm_events_tp(struct perf_kvm_stat *kvm __maybe_unused)
1178 {
1179         return 0;
1180 }
1181 
1182 static int
1183 kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
1184 {
1185         unsigned int rec_argc, i, j, events_tp_size;
1186         const char **rec_argv;
1187         const char * const record_args[] = {
1188                 "record",
1189                 "-R",
1190                 "-m", "1024",
1191                 "-c", "1",
1192         };
1193         const char * const kvm_stat_record_usage[] = {
1194                 "perf kvm stat record [<options>]",
1195                 NULL
1196         };
1197         const char * const *events_tp;
1198         int ret;
1199 
1200         events_tp_size = 0;
1201         ret = setup_kvm_events_tp(kvm);
1202         if (ret < 0) {
1203                 pr_err("Unable to setup the kvm tracepoints\n");
1204                 return ret;
1205         }
1206 
1207         for (events_tp = kvm_events_tp; *events_tp; events_tp++)
1208                 events_tp_size++;
1209 
1210         rec_argc = ARRAY_SIZE(record_args) + argc + 2 +
1211                    2 * events_tp_size;
1212         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1213 
1214         if (rec_argv == NULL)
1215                 return -ENOMEM;
1216 
1217         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1218                 rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);
1219 
1220         for (j = 0; j < events_tp_size; j++) {
1221                 rec_argv[i++] = "-e";
1222                 rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]);
1223         }
1224 
1225         rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
1226         rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);
1227 
1228         for (j = 1; j < (unsigned int)argc; j++, i++)
1229                 rec_argv[i] = argv[j];
1230 
1231         set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
1232         set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
1233         set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);
1234 
1235         set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
1236         set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
1237         set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
1238         set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
1239         set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
1240         set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
1241         set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
1242         set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
1243         set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
1244         set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
1245         set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
1246         set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
1247         set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
1248         set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
1249         set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
1250 
1251         record_usage = kvm_stat_record_usage;
1252         return cmd_record(i, rec_argv);
1253 }
1254 
1255 static int
1256 kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
1257 {
1258         const struct option kvm_events_report_options[] = {
1259                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1260                            "event for reporting: vmexit, "
1261                            "mmio (x86 only), ioport (x86 only)"),
1262                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1263                             "vcpu id to report"),
1264                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1265                             "key for sorting: sample(sort by samples number)"
1266                             " time (sort by avg time)"),
1267                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1268                            "analyze events only for given process id(s)"),
1269                 OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"),
1270                 OPT_END()
1271         };
1272 
1273         const char * const kvm_events_report_usage[] = {
1274                 "perf kvm stat report [<options>]",
1275                 NULL
1276         };
1277 
1278         if (argc) {
1279                 argc = parse_options(argc, argv,
1280                                      kvm_events_report_options,
1281                                      kvm_events_report_usage, 0);
1282                 if (argc)
1283                         usage_with_options(kvm_events_report_usage,
1284                                            kvm_events_report_options);
1285         }
1286 
1287         if (!kvm->opts.target.pid)
1288                 kvm->opts.target.system_wide = true;
1289 
1290         return kvm_events_report_vcpu(kvm);
1291 }
1292 
1293 #ifdef HAVE_TIMERFD_SUPPORT
1294 static struct evlist *kvm_live_event_list(void)
1295 {
1296         struct evlist *evlist;
1297         char *tp, *name, *sys;
1298         int err = -1;
1299         const char * const *events_tp;
1300 
1301         evlist = evlist__new();
1302         if (evlist == NULL)
1303                 return NULL;
1304 
1305         for (events_tp = kvm_events_tp; *events_tp; events_tp++) {
1306 
1307                 tp = strdup(*events_tp);
1308                 if (tp == NULL)
1309                         goto out;
1310 
1311                 /* split tracepoint into subsystem and name */
1312                 sys = tp;
1313                 name = strchr(tp, ':');
1314                 if (name == NULL) {
1315                         pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n",
1316                                *events_tp);
1317                         free(tp);
1318                         goto out;
1319                 }
1320                 *name = '\0';
1321                 name++;
1322 
1323                 if (perf_evlist__add_newtp(evlist, sys, name, NULL)) {
1324                         pr_err("Failed to add %s tracepoint to the list\n", *events_tp);
1325                         free(tp);
1326                         goto out;
1327                 }
1328 
1329                 free(tp);
1330         }
1331 
1332         err = 0;
1333 
1334 out:
1335         if (err) {
1336                 evlist__delete(evlist);
1337                 evlist = NULL;
1338         }
1339 
1340         return evlist;
1341 }
1342 
1343 static int kvm_events_live(struct perf_kvm_stat *kvm,
1344                            int argc, const char **argv)
1345 {
1346         char errbuf[BUFSIZ];
1347         int err;
1348 
1349         const struct option live_options[] = {
1350                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1351                         "record events on existing process id"),
1352                 OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
1353                         "number of mmap data pages",
1354                         perf_evlist__parse_mmap_pages),
1355                 OPT_INCR('v', "verbose", &verbose,
1356                         "be more verbose (show counter open errors, etc)"),
1357                 OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
1358                         "system-wide collection from all CPUs"),
1359                 OPT_UINTEGER('d', "display", &kvm->display_time,
1360                         "time in seconds between display updates"),
1361                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1362                         "event for reporting: "
1363                         "vmexit, mmio (x86 only), ioport (x86 only)"),
1364                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1365                         "vcpu id to report"),
1366                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1367                         "key for sorting: sample(sort by samples number)"
1368                         " time (sort by avg time)"),
1369                 OPT_U64(0, "duration", &kvm->duration,
1370                         "show events other than"
1371                         " HLT (x86 only) or Wait state (s390 only)"
1372                         " that take longer than duration usecs"),
1373                 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
1374                                 "per thread proc mmap processing timeout in ms"),
1375                 OPT_END()
1376         };
1377         const char * const live_usage[] = {
1378                 "perf kvm stat live [<options>]",
1379                 NULL
1380         };
1381         struct perf_data data = {
1382                 .mode = PERF_DATA_MODE_WRITE,
1383         };
1384 
1385 
1386         /* event handling */
1387         kvm->tool.sample = process_sample_event;
1388         kvm->tool.comm   = perf_event__process_comm;
1389         kvm->tool.exit   = perf_event__process_exit;
1390         kvm->tool.fork   = perf_event__process_fork;
1391         kvm->tool.lost   = process_lost_event;
1392         kvm->tool.namespaces  = perf_event__process_namespaces;
1393         kvm->tool.ordered_events = true;
1394         perf_tool__fill_defaults(&kvm->tool);
1395 
1396         /* set defaults */
1397         kvm->display_time = 1;
1398         kvm->opts.user_interval = 1;
1399         kvm->opts.mmap_pages = 512;
1400         kvm->opts.target.uses_mmap = false;
1401         kvm->opts.target.uid_str = NULL;
1402         kvm->opts.target.uid = UINT_MAX;
1403 
1404         symbol__init(NULL);
1405         disable_buildid_cache();
1406 
1407         use_browser = 0;
1408 
1409         if (argc) {
1410                 argc = parse_options(argc, argv, live_options,
1411                                      live_usage, 0);
1412                 if (argc)
1413                         usage_with_options(live_usage, live_options);
1414         }
1415 
1416         kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */
1417 
1418         /*
1419          * target related setups
1420          */
1421         err = target__validate(&kvm->opts.target);
1422         if (err) {
1423                 target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ);
1424                 ui__warning("%s", errbuf);
1425         }
1426 
1427         if (target__none(&kvm->opts.target))
1428                 kvm->opts.target.system_wide = true;
1429 
1430 
1431         /*
1432          * generate the event list
1433          */
1434         err = setup_kvm_events_tp(kvm);
1435         if (err < 0) {
1436                 pr_err("Unable to setup the kvm tracepoints\n");
1437                 return err;
1438         }
1439 
1440         kvm->evlist = kvm_live_event_list();
1441         if (kvm->evlist == NULL) {
1442                 err = -1;
1443                 goto out;
1444         }
1445 
1446         if (perf_evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0)
1447                 usage_with_options(live_usage, live_options);
1448 
1449         /*
1450          * perf session
1451          */
1452         kvm->session = perf_session__new(&data, false, &kvm->tool);
1453         if (IS_ERR(kvm->session)) {
1454                 err = PTR_ERR(kvm->session);
1455                 goto out;
1456         }
1457         kvm->session->evlist = kvm->evlist;
1458         perf_session__set_id_hdr_size(kvm->session);
1459         ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
1460         machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
1461                                     kvm->evlist->core.threads, false, 1);
1462         err = kvm_live_open_events(kvm);
1463         if (err)
1464                 goto out;
1465 
1466         err = kvm_events_live_report(kvm);
1467 
1468 out:
1469         perf_session__delete(kvm->session);
1470         kvm->session = NULL;
1471         evlist__delete(kvm->evlist);
1472 
1473         return err;
1474 }
1475 #endif
1476 
1477 static void print_kvm_stat_usage(void)
1478 {
1479         printf("Usage: perf kvm stat <command>\n\n");
1480 
1481         printf("# Available commands:\n");
1482         printf("\trecord: record kvm events\n");
1483         printf("\treport: report statistical data of kvm events\n");
1484         printf("\tlive:   live reporting of statistical data of kvm events\n");
1485 
1486         printf("\nOtherwise, it is the alias of 'perf stat':\n");
1487 }
1488 
1489 static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
1490 {
1491         struct perf_kvm_stat kvm = {
1492                 .file_name = file_name,
1493 
1494                 .trace_vcpu     = -1,
1495                 .report_event   = "vmexit",
1496                 .sort_key       = "sample",
1497 
1498         };
1499 
1500         if (argc == 1) {
1501                 print_kvm_stat_usage();
1502                 goto perf_stat;
1503         }
1504 
1505         if (!strncmp(argv[1], "rec", 3))
1506                 return kvm_events_record(&kvm, argc - 1, argv + 1);
1507 
1508         if (!strncmp(argv[1], "rep", 3))
1509                 return kvm_events_report(&kvm, argc - 1 , argv + 1);
1510 
1511 #ifdef HAVE_TIMERFD_SUPPORT
1512         if (!strncmp(argv[1], "live", 4))
1513                 return kvm_events_live(&kvm, argc - 1 , argv + 1);
1514 #endif
1515 
1516 perf_stat:
1517         return cmd_stat(argc, argv);
1518 }
1519 #endif /* HAVE_KVM_STAT_SUPPORT */
1520 
1521 int __weak kvm_add_default_arch_event(int *argc __maybe_unused,
1522                                         const char **argv __maybe_unused)
1523 {
1524         return 0;
1525 }
1526 
1527 static int __cmd_record(const char *file_name, int argc, const char **argv)
1528 {
1529         int rec_argc, i = 0, j, ret;
1530         const char **rec_argv;
1531 
1532         ret = kvm_add_default_arch_event(&argc, argv);
1533         if (ret)
1534                 return -EINVAL;
1535 
1536         rec_argc = argc + 2;
1537         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1538         rec_argv[i++] = strdup("record");
1539         rec_argv[i++] = strdup("-o");
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_record(i, rec_argv);
1547 }
1548 
1549 static int __cmd_report(const char *file_name, int argc, const char **argv)
1550 {
1551         int rec_argc, i = 0, j;
1552         const char **rec_argv;
1553 
1554         rec_argc = argc + 2;
1555         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1556         rec_argv[i++] = strdup("report");
1557         rec_argv[i++] = strdup("-i");
1558         rec_argv[i++] = strdup(file_name);
1559         for (j = 1; j < argc; j++, i++)
1560                 rec_argv[i] = argv[j];
1561 
1562         BUG_ON(i != rec_argc);
1563 
1564         return cmd_report(i, rec_argv);
1565 }
1566 
1567 static int
1568 __cmd_buildid_list(const char *file_name, int argc, const char **argv)
1569 {
1570         int rec_argc, i = 0, j;
1571         const char **rec_argv;
1572 
1573         rec_argc = argc + 2;
1574         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1575         rec_argv[i++] = strdup("buildid-list");
1576         rec_argv[i++] = strdup("-i");
1577         rec_argv[i++] = strdup(file_name);
1578         for (j = 1; j < argc; j++, i++)
1579                 rec_argv[i] = argv[j];
1580 
1581         BUG_ON(i != rec_argc);
1582 
1583         return cmd_buildid_list(i, rec_argv);
1584 }
1585 
1586 int cmd_kvm(int argc, const char **argv)
1587 {
1588         const char *file_name = NULL;
1589         const struct option kvm_options[] = {
1590                 OPT_STRING('i', "input", &file_name, "file",
1591                            "Input file name"),
1592                 OPT_STRING('o', "output", &file_name, "file",
1593                            "Output file name"),
1594                 OPT_BOOLEAN(0, "guest", &perf_guest,
1595                             "Collect guest os data"),
1596                 OPT_BOOLEAN(0, "host", &perf_host,
1597                             "Collect host os data"),
1598                 OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
1599                            "guest mount directory under which every guest os"
1600                            " instance has a subdir"),
1601                 OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
1602                            "file", "file saving guest os vmlinux"),
1603                 OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
1604                            "file", "file saving guest os /proc/kallsyms"),
1605                 OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
1606                            "file", "file saving guest os /proc/modules"),
1607                 OPT_INCR('v', "verbose", &verbose,
1608                             "be more verbose (show counter open errors, etc)"),
1609                 OPT_END()
1610         };
1611 
1612         const char *const kvm_subcommands[] = { "top", "record", "report", "diff",
1613                                                 "buildid-list", "stat", NULL };
1614         const char *kvm_usage[] = { NULL, NULL };
1615 
1616         perf_host  = 0;
1617         perf_guest = 1;
1618 
1619         argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, kvm_usage,
1620                                         PARSE_OPT_STOP_AT_NON_OPTION);
1621         if (!argc)
1622                 usage_with_options(kvm_usage, kvm_options);
1623 
1624         if (!perf_host)
1625                 perf_guest = 1;
1626 
1627         if (!file_name) {
1628                 file_name = get_filename_for_perf_kvm();
1629 
1630                 if (!file_name) {
1631                         pr_err("Failed to allocate memory for filename\n");
1632                         return -ENOMEM;
1633                 }
1634         }
1635 
1636         if (!strncmp(argv[0], "rec", 3))
1637                 return __cmd_record(file_name, argc, argv);
1638         else if (!strncmp(argv[0], "rep", 3))
1639                 return __cmd_report(file_name, argc, argv);
1640         else if (!strncmp(argv[0], "diff", 4))
1641                 return cmd_diff(argc, argv);
1642         else if (!strncmp(argv[0], "top", 3))
1643                 return cmd_top(argc, argv);
1644         else if (!strncmp(argv[0], "buildid-list", 12))
1645                 return __cmd_buildid_list(file_name, argc, argv);
1646 #ifdef HAVE_KVM_STAT_SUPPORT
1647         else if (!strncmp(argv[0], "stat", 4))
1648                 return kvm_cmd_stat(file_name, argc, argv);
1649 #endif
1650         else
1651                 usage_with_options(kvm_usage, kvm_options);
1652 
1653         return 0;
1654 }
1655 

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