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

Version: ~ [ linux-5.6-rc1 ] ~ [ linux-5.5.2 ] ~ [ linux-5.4.17 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.102 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.170 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.213 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.213 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #include "builtin.h"
  2 #include "perf.h"
  3 
  4 #include "util/evsel.h"
  5 #include "util/evlist.h"
  6 #include "util/util.h"
  7 #include "util/cache.h"
  8 #include "util/symbol.h"
  9 #include "util/thread.h"
 10 #include "util/header.h"
 11 #include "util/session.h"
 12 #include "util/intlist.h"
 13 #include <subcmd/parse-options.h>
 14 #include "util/trace-event.h"
 15 #include "util/debug.h"
 16 #include "util/tool.h"
 17 #include "util/stat.h"
 18 #include "util/top.h"
 19 #include "util/data.h"
 20 #include "util/ordered-events.h"
 21 
 22 #include <sys/prctl.h>
 23 #ifdef HAVE_TIMERFD_SUPPORT
 24 #include <sys/timerfd.h>
 25 #endif
 26 
 27 #include <termios.h>
 28 #include <semaphore.h>
 29 #include <pthread.h>
 30 #include <math.h>
 31 
 32 #ifdef HAVE_KVM_STAT_SUPPORT
 33 #include "util/kvm-stat.h"
 34 
 35 void exit_event_get_key(struct perf_evsel *evsel,
 36                         struct perf_sample *sample,
 37                         struct event_key *key)
 38 {
 39         key->info = 0;
 40         key->key = perf_evsel__intval(evsel, sample, kvm_exit_reason);
 41 }
 42 
 43 bool kvm_exit_event(struct perf_evsel *evsel)
 44 {
 45         return !strcmp(evsel->name, kvm_exit_trace);
 46 }
 47 
 48 bool exit_event_begin(struct perf_evsel *evsel,
 49                       struct perf_sample *sample, struct event_key *key)
 50 {
 51         if (kvm_exit_event(evsel)) {
 52                 exit_event_get_key(evsel, sample, key);
 53                 return true;
 54         }
 55 
 56         return false;
 57 }
 58 
 59 bool kvm_entry_event(struct perf_evsel *evsel)
 60 {
 61         return !strcmp(evsel->name, kvm_entry_trace);
 62 }
 63 
 64 bool exit_event_end(struct perf_evsel *evsel,
 65                     struct perf_sample *sample __maybe_unused,
 66                     struct event_key *key __maybe_unused)
 67 {
 68         return kvm_entry_event(evsel);
 69 }
 70 
 71 static const char *get_exit_reason(struct perf_kvm_stat *kvm,
 72                                    struct exit_reasons_table *tbl,
 73                                    u64 exit_code)
 74 {
 75         while (tbl->reason != NULL) {
 76                 if (tbl->exit_code == exit_code)
 77                         return tbl->reason;
 78                 tbl++;
 79         }
 80 
 81         pr_err("unknown kvm exit code:%lld on %s\n",
 82                 (unsigned long long)exit_code, kvm->exit_reasons_isa);
 83         return "UNKNOWN";
 84 }
 85 
 86 void exit_event_decode_key(struct perf_kvm_stat *kvm,
 87                            struct event_key *key,
 88                            char *decode)
 89 {
 90         const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
 91                                                   key->key);
 92 
 93         scnprintf(decode, decode_str_len, "%s", exit_reason);
 94 }
 95 
 96 static bool register_kvm_events_ops(struct perf_kvm_stat *kvm)
 97 {
 98         struct kvm_reg_events_ops *events_ops = kvm_reg_events_ops;
 99 
100         for (events_ops = kvm_reg_events_ops; events_ops->name; events_ops++) {
101                 if (!strcmp(events_ops->name, kvm->report_event)) {
102                         kvm->events_ops = events_ops->ops;
103                         return true;
104                 }
105         }
106 
107         return false;
108 }
109 
110 struct vcpu_event_record {
111         int vcpu_id;
112         u64 start_time;
113         struct kvm_event *last_event;
114 };
115 
116 
117 static void init_kvm_event_record(struct perf_kvm_stat *kvm)
118 {
119         unsigned int i;
120 
121         for (i = 0; i < EVENTS_CACHE_SIZE; i++)
122                 INIT_LIST_HEAD(&kvm->kvm_events_cache[i]);
123 }
124 
125 #ifdef HAVE_TIMERFD_SUPPORT
126 static void clear_events_cache_stats(struct list_head *kvm_events_cache)
127 {
128         struct list_head *head;
129         struct kvm_event *event;
130         unsigned int i;
131         int j;
132 
133         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
134                 head = &kvm_events_cache[i];
135                 list_for_each_entry(event, head, hash_entry) {
136                         /* reset stats for event */
137                         event->total.time = 0;
138                         init_stats(&event->total.stats);
139 
140                         for (j = 0; j < event->max_vcpu; ++j) {
141                                 event->vcpu[j].time = 0;
142                                 init_stats(&event->vcpu[j].stats);
143                         }
144                 }
145         }
146 }
147 #endif
148 
149 static int kvm_events_hash_fn(u64 key)
150 {
151         return key & (EVENTS_CACHE_SIZE - 1);
152 }
153 
154 static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
155 {
156         int old_max_vcpu = event->max_vcpu;
157         void *prev;
158 
159         if (vcpu_id < event->max_vcpu)
160                 return true;
161 
162         while (event->max_vcpu <= vcpu_id)
163                 event->max_vcpu += DEFAULT_VCPU_NUM;
164 
165         prev = event->vcpu;
166         event->vcpu = realloc(event->vcpu,
167                               event->max_vcpu * sizeof(*event->vcpu));
168         if (!event->vcpu) {
169                 free(prev);
170                 pr_err("Not enough memory\n");
171                 return false;
172         }
173 
174         memset(event->vcpu + old_max_vcpu, 0,
175                (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
176         return true;
177 }
178 
179 static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
180 {
181         struct kvm_event *event;
182 
183         event = zalloc(sizeof(*event));
184         if (!event) {
185                 pr_err("Not enough memory\n");
186                 return NULL;
187         }
188 
189         event->key = *key;
190         init_stats(&event->total.stats);
191         return event;
192 }
193 
194 static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm,
195                                                struct event_key *key)
196 {
197         struct kvm_event *event;
198         struct list_head *head;
199 
200         BUG_ON(key->key == INVALID_KEY);
201 
202         head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)];
203         list_for_each_entry(event, head, hash_entry) {
204                 if (event->key.key == key->key && event->key.info == key->info)
205                         return event;
206         }
207 
208         event = kvm_alloc_init_event(key);
209         if (!event)
210                 return NULL;
211 
212         list_add(&event->hash_entry, head);
213         return event;
214 }
215 
216 static bool handle_begin_event(struct perf_kvm_stat *kvm,
217                                struct vcpu_event_record *vcpu_record,
218                                struct event_key *key, u64 timestamp)
219 {
220         struct kvm_event *event = NULL;
221 
222         if (key->key != INVALID_KEY)
223                 event = find_create_kvm_event(kvm, key);
224 
225         vcpu_record->last_event = event;
226         vcpu_record->start_time = timestamp;
227         return true;
228 }
229 
230 static void
231 kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff)
232 {
233         kvm_stats->time += time_diff;
234         update_stats(&kvm_stats->stats, time_diff);
235 }
236 
237 static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
238 {
239         struct kvm_event_stats *kvm_stats = &event->total;
240 
241         if (vcpu_id != -1)
242                 kvm_stats = &event->vcpu[vcpu_id];
243 
244         return rel_stddev_stats(stddev_stats(&kvm_stats->stats),
245                                 avg_stats(&kvm_stats->stats));
246 }
247 
248 static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
249                              u64 time_diff)
250 {
251         if (vcpu_id == -1) {
252                 kvm_update_event_stats(&event->total, time_diff);
253                 return true;
254         }
255 
256         if (!kvm_event_expand(event, vcpu_id))
257                 return false;
258 
259         kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
260         return true;
261 }
262 
263 static bool is_child_event(struct perf_kvm_stat *kvm,
264                            struct perf_evsel *evsel,
265                            struct perf_sample *sample,
266                            struct event_key *key)
267 {
268         struct child_event_ops *child_ops;
269 
270         child_ops = kvm->events_ops->child_ops;
271 
272         if (!child_ops)
273                 return false;
274 
275         for (; child_ops->name; child_ops++) {
276                 if (!strcmp(evsel->name, child_ops->name)) {
277                         child_ops->get_key(evsel, sample, key);
278                         return true;
279                 }
280         }
281 
282         return false;
283 }
284 
285 static bool handle_child_event(struct perf_kvm_stat *kvm,
286                                struct vcpu_event_record *vcpu_record,
287                                struct event_key *key,
288                                struct perf_sample *sample __maybe_unused)
289 {
290         struct kvm_event *event = NULL;
291 
292         if (key->key != INVALID_KEY)
293                 event = find_create_kvm_event(kvm, key);
294 
295         vcpu_record->last_event = event;
296 
297         return true;
298 }
299 
300 static bool skip_event(const char *event)
301 {
302         const char * const *skip_events;
303 
304         for (skip_events = kvm_skip_events; *skip_events; skip_events++)
305                 if (!strcmp(event, *skip_events))
306                         return true;
307 
308         return false;
309 }
310 
311 static bool handle_end_event(struct perf_kvm_stat *kvm,
312                              struct vcpu_event_record *vcpu_record,
313                              struct event_key *key,
314                              struct perf_sample *sample)
315 {
316         struct kvm_event *event;
317         u64 time_begin, time_diff;
318         int vcpu;
319 
320         if (kvm->trace_vcpu == -1)
321                 vcpu = -1;
322         else
323                 vcpu = vcpu_record->vcpu_id;
324 
325         event = vcpu_record->last_event;
326         time_begin = vcpu_record->start_time;
327 
328         /* The begin event is not caught. */
329         if (!time_begin)
330                 return true;
331 
332         /*
333          * In some case, the 'begin event' only records the start timestamp,
334          * the actual event is recognized in the 'end event' (e.g. mmio-event).
335          */
336 
337         /* Both begin and end events did not get the key. */
338         if (!event && key->key == INVALID_KEY)
339                 return true;
340 
341         if (!event)
342                 event = find_create_kvm_event(kvm, key);
343 
344         if (!event)
345                 return false;
346 
347         vcpu_record->last_event = NULL;
348         vcpu_record->start_time = 0;
349 
350         /* seems to happen once in a while during live mode */
351         if (sample->time < time_begin) {
352                 pr_debug("End time before begin time; skipping event.\n");
353                 return true;
354         }
355 
356         time_diff = sample->time - time_begin;
357 
358         if (kvm->duration && time_diff > kvm->duration) {
359                 char decode[decode_str_len];
360 
361                 kvm->events_ops->decode_key(kvm, &event->key, decode);
362                 if (!skip_event(decode)) {
363                         pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
364                                  sample->time, sample->pid, vcpu_record->vcpu_id,
365                                  decode, time_diff/1000);
366                 }
367         }
368 
369         return update_kvm_event(event, vcpu, time_diff);
370 }
371 
372 static
373 struct vcpu_event_record *per_vcpu_record(struct thread *thread,
374                                           struct perf_evsel *evsel,
375                                           struct perf_sample *sample)
376 {
377         /* Only kvm_entry records vcpu id. */
378         if (!thread__priv(thread) && kvm_entry_event(evsel)) {
379                 struct vcpu_event_record *vcpu_record;
380 
381                 vcpu_record = zalloc(sizeof(*vcpu_record));
382                 if (!vcpu_record) {
383                         pr_err("%s: Not enough memory\n", __func__);
384                         return NULL;
385                 }
386 
387                 vcpu_record->vcpu_id = perf_evsel__intval(evsel, sample,
388                                                           vcpu_id_str);
389                 thread__set_priv(thread, vcpu_record);
390         }
391 
392         return thread__priv(thread);
393 }
394 
395 static bool handle_kvm_event(struct perf_kvm_stat *kvm,
396                              struct thread *thread,
397                              struct perf_evsel *evsel,
398                              struct perf_sample *sample)
399 {
400         struct vcpu_event_record *vcpu_record;
401         struct event_key key = { .key = INVALID_KEY,
402                                  .exit_reasons = kvm->exit_reasons };
403 
404         vcpu_record = per_vcpu_record(thread, evsel, sample);
405         if (!vcpu_record)
406                 return true;
407 
408         /* only process events for vcpus user cares about */
409         if ((kvm->trace_vcpu != -1) &&
410             (kvm->trace_vcpu != vcpu_record->vcpu_id))
411                 return true;
412 
413         if (kvm->events_ops->is_begin_event(evsel, sample, &key))
414                 return handle_begin_event(kvm, vcpu_record, &key, sample->time);
415 
416         if (is_child_event(kvm, evsel, sample, &key))
417                 return handle_child_event(kvm, vcpu_record, &key, sample);
418 
419         if (kvm->events_ops->is_end_event(evsel, sample, &key))
420                 return handle_end_event(kvm, vcpu_record, &key, sample);
421 
422         return true;
423 }
424 
425 #define GET_EVENT_KEY(func, field)                                      \
426 static u64 get_event_ ##func(struct kvm_event *event, int vcpu)         \
427 {                                                                       \
428         if (vcpu == -1)                                                 \
429                 return event->total.field;                              \
430                                                                         \
431         if (vcpu >= event->max_vcpu)                                    \
432                 return 0;                                               \
433                                                                         \
434         return event->vcpu[vcpu].field;                                 \
435 }
436 
437 #define COMPARE_EVENT_KEY(func, field)                                  \
438 GET_EVENT_KEY(func, field)                                              \
439 static int compare_kvm_event_ ## func(struct kvm_event *one,            \
440                                         struct kvm_event *two, int vcpu)\
441 {                                                                       \
442         return get_event_ ##func(one, vcpu) >                           \
443                                 get_event_ ##func(two, vcpu);           \
444 }
445 
446 GET_EVENT_KEY(time, time);
447 COMPARE_EVENT_KEY(count, stats.n);
448 COMPARE_EVENT_KEY(mean, stats.mean);
449 GET_EVENT_KEY(max, stats.max);
450 GET_EVENT_KEY(min, stats.min);
451 
452 #define DEF_SORT_NAME_KEY(name, compare_key)                            \
453         { #name, compare_kvm_event_ ## compare_key }
454 
455 static struct kvm_event_key keys[] = {
456         DEF_SORT_NAME_KEY(sample, count),
457         DEF_SORT_NAME_KEY(time, mean),
458         { NULL, NULL }
459 };
460 
461 static bool select_key(struct perf_kvm_stat *kvm)
462 {
463         int i;
464 
465         for (i = 0; keys[i].name; i++) {
466                 if (!strcmp(keys[i].name, kvm->sort_key)) {
467                         kvm->compare = keys[i].key;
468                         return true;
469                 }
470         }
471 
472         pr_err("Unknown compare key:%s\n", kvm->sort_key);
473         return false;
474 }
475 
476 static void insert_to_result(struct rb_root *result, struct kvm_event *event,
477                              key_cmp_fun bigger, int vcpu)
478 {
479         struct rb_node **rb = &result->rb_node;
480         struct rb_node *parent = NULL;
481         struct kvm_event *p;
482 
483         while (*rb) {
484                 p = container_of(*rb, struct kvm_event, rb);
485                 parent = *rb;
486 
487                 if (bigger(event, p, vcpu))
488                         rb = &(*rb)->rb_left;
489                 else
490                         rb = &(*rb)->rb_right;
491         }
492 
493         rb_link_node(&event->rb, parent, rb);
494         rb_insert_color(&event->rb, result);
495 }
496 
497 static void
498 update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event)
499 {
500         int vcpu = kvm->trace_vcpu;
501 
502         kvm->total_count += get_event_count(event, vcpu);
503         kvm->total_time += get_event_time(event, vcpu);
504 }
505 
506 static bool event_is_valid(struct kvm_event *event, int vcpu)
507 {
508         return !!get_event_count(event, vcpu);
509 }
510 
511 static void sort_result(struct perf_kvm_stat *kvm)
512 {
513         unsigned int i;
514         int vcpu = kvm->trace_vcpu;
515         struct kvm_event *event;
516 
517         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
518                 list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) {
519                         if (event_is_valid(event, vcpu)) {
520                                 update_total_count(kvm, event);
521                                 insert_to_result(&kvm->result, event,
522                                                  kvm->compare, vcpu);
523                         }
524                 }
525         }
526 }
527 
528 /* returns left most element of result, and erase it */
529 static struct kvm_event *pop_from_result(struct rb_root *result)
530 {
531         struct rb_node *node = rb_first(result);
532 
533         if (!node)
534                 return NULL;
535 
536         rb_erase(node, result);
537         return container_of(node, struct kvm_event, rb);
538 }
539 
540 static void print_vcpu_info(struct perf_kvm_stat *kvm)
541 {
542         int vcpu = kvm->trace_vcpu;
543 
544         pr_info("Analyze events for ");
545 
546         if (kvm->opts.target.system_wide)
547                 pr_info("all VMs, ");
548         else if (kvm->opts.target.pid)
549                 pr_info("pid(s) %s, ", kvm->opts.target.pid);
550         else
551                 pr_info("dazed and confused on what is monitored, ");
552 
553         if (vcpu == -1)
554                 pr_info("all VCPUs:\n\n");
555         else
556                 pr_info("VCPU %d:\n\n", vcpu);
557 }
558 
559 static void show_timeofday(void)
560 {
561         char date[64];
562         struct timeval tv;
563         struct tm ltime;
564 
565         gettimeofday(&tv, NULL);
566         if (localtime_r(&tv.tv_sec, &ltime)) {
567                 strftime(date, sizeof(date), "%H:%M:%S", &ltime);
568                 pr_info("%s.%06ld", date, tv.tv_usec);
569         } else
570                 pr_info("00:00:00.000000");
571 
572         return;
573 }
574 
575 static void print_result(struct perf_kvm_stat *kvm)
576 {
577         char decode[decode_str_len];
578         struct kvm_event *event;
579         int vcpu = kvm->trace_vcpu;
580 
581         if (kvm->live) {
582                 puts(CONSOLE_CLEAR);
583                 show_timeofday();
584         }
585 
586         pr_info("\n\n");
587         print_vcpu_info(kvm);
588         pr_info("%*s ", decode_str_len, kvm->events_ops->name);
589         pr_info("%10s ", "Samples");
590         pr_info("%9s ", "Samples%");
591 
592         pr_info("%9s ", "Time%");
593         pr_info("%11s ", "Min Time");
594         pr_info("%11s ", "Max Time");
595         pr_info("%16s ", "Avg time");
596         pr_info("\n\n");
597 
598         while ((event = pop_from_result(&kvm->result))) {
599                 u64 ecount, etime, max, min;
600 
601                 ecount = get_event_count(event, vcpu);
602                 etime = get_event_time(event, vcpu);
603                 max = get_event_max(event, vcpu);
604                 min = get_event_min(event, vcpu);
605 
606                 kvm->events_ops->decode_key(kvm, &event->key, decode);
607                 pr_info("%*s ", decode_str_len, decode);
608                 pr_info("%10llu ", (unsigned long long)ecount);
609                 pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
610                 pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
611                 pr_info("%9.2fus ", (double)min / 1e3);
612                 pr_info("%9.2fus ", (double)max / 1e3);
613                 pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount/1e3,
614                         kvm_event_rel_stddev(vcpu, event));
615                 pr_info("\n");
616         }
617 
618         pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n",
619                 kvm->total_count, kvm->total_time / 1e3);
620 
621         if (kvm->lost_events)
622                 pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events);
623 }
624 
625 #ifdef HAVE_TIMERFD_SUPPORT
626 static int process_lost_event(struct perf_tool *tool,
627                               union perf_event *event __maybe_unused,
628                               struct perf_sample *sample __maybe_unused,
629                               struct machine *machine __maybe_unused)
630 {
631         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, tool);
632 
633         kvm->lost_events++;
634         return 0;
635 }
636 #endif
637 
638 static bool skip_sample(struct perf_kvm_stat *kvm,
639                         struct perf_sample *sample)
640 {
641         if (kvm->pid_list && intlist__find(kvm->pid_list, sample->pid) == NULL)
642                 return true;
643 
644         return false;
645 }
646 
647 static int process_sample_event(struct perf_tool *tool,
648                                 union perf_event *event,
649                                 struct perf_sample *sample,
650                                 struct perf_evsel *evsel,
651                                 struct machine *machine)
652 {
653         int err = 0;
654         struct thread *thread;
655         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat,
656                                                  tool);
657 
658         if (skip_sample(kvm, sample))
659                 return 0;
660 
661         thread = machine__findnew_thread(machine, sample->pid, sample->tid);
662         if (thread == NULL) {
663                 pr_debug("problem processing %d event, skipping it.\n",
664                         event->header.type);
665                 return -1;
666         }
667 
668         if (!handle_kvm_event(kvm, thread, evsel, sample))
669                 err = -1;
670 
671         thread__put(thread);
672         return err;
673 }
674 
675 static int cpu_isa_config(struct perf_kvm_stat *kvm)
676 {
677         char buf[64], *cpuid;
678         int err;
679 
680         if (kvm->live) {
681                 err = get_cpuid(buf, sizeof(buf));
682                 if (err != 0) {
683                         pr_err("Failed to look up CPU type\n");
684                         return err;
685                 }
686                 cpuid = buf;
687         } else
688                 cpuid = kvm->session->header.env.cpuid;
689 
690         if (!cpuid) {
691                 pr_err("Failed to look up CPU type\n");
692                 return -EINVAL;
693         }
694 
695         err = cpu_isa_init(kvm, cpuid);
696         if (err == -ENOTSUP)
697                 pr_err("CPU %s is not supported.\n", cpuid);
698 
699         return err;
700 }
701 
702 static bool verify_vcpu(int vcpu)
703 {
704         if (vcpu != -1 && vcpu < 0) {
705                 pr_err("Invalid vcpu:%d.\n", vcpu);
706                 return false;
707         }
708 
709         return true;
710 }
711 
712 #ifdef HAVE_TIMERFD_SUPPORT
713 /* keeping the max events to a modest level to keep
714  * the processing of samples per mmap smooth.
715  */
716 #define PERF_KVM__MAX_EVENTS_PER_MMAP  25
717 
718 static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
719                                    u64 *mmap_time)
720 {
721         union perf_event *event;
722         struct perf_sample sample;
723         s64 n = 0;
724         int err;
725 
726         *mmap_time = ULLONG_MAX;
727         while ((event = perf_evlist__mmap_read(kvm->evlist, idx)) != NULL) {
728                 err = perf_evlist__parse_sample(kvm->evlist, event, &sample);
729                 if (err) {
730                         perf_evlist__mmap_consume(kvm->evlist, idx);
731                         pr_err("Failed to parse sample\n");
732                         return -1;
733                 }
734 
735                 err = perf_session__queue_event(kvm->session, event, &sample, 0);
736                 /*
737                  * FIXME: Here we can't consume the event, as perf_session__queue_event will
738                  *        point to it, and it'll get possibly overwritten by the kernel.
739                  */
740                 perf_evlist__mmap_consume(kvm->evlist, idx);
741 
742                 if (err) {
743                         pr_err("Failed to enqueue sample: %d\n", err);
744                         return -1;
745                 }
746 
747                 /* save time stamp of our first sample for this mmap */
748                 if (n == 0)
749                         *mmap_time = sample.time;
750 
751                 /* limit events per mmap handled all at once */
752                 n++;
753                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
754                         break;
755         }
756 
757         return n;
758 }
759 
760 static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm)
761 {
762         int i, err, throttled = 0;
763         s64 n, ntotal = 0;
764         u64 flush_time = ULLONG_MAX, mmap_time;
765 
766         for (i = 0; i < kvm->evlist->nr_mmaps; i++) {
767                 n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time);
768                 if (n < 0)
769                         return -1;
770 
771                 /* flush time is going to be the minimum of all the individual
772                  * mmap times. Essentially, we flush all the samples queued up
773                  * from the last pass under our minimal start time -- that leaves
774                  * a very small race for samples to come in with a lower timestamp.
775                  * The ioctl to return the perf_clock timestamp should close the
776                  * race entirely.
777                  */
778                 if (mmap_time < flush_time)
779                         flush_time = mmap_time;
780 
781                 ntotal += n;
782                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
783                         throttled = 1;
784         }
785 
786         /* flush queue after each round in which we processed events */
787         if (ntotal) {
788                 struct ordered_events *oe = &kvm->session->ordered_events;
789 
790                 oe->next_flush = flush_time;
791                 err = ordered_events__flush(oe, OE_FLUSH__ROUND);
792                 if (err) {
793                         if (kvm->lost_events)
794                                 pr_info("\nLost events: %" PRIu64 "\n\n",
795                                         kvm->lost_events);
796                         return err;
797                 }
798         }
799 
800         return throttled;
801 }
802 
803 static volatile int done;
804 
805 static void sig_handler(int sig __maybe_unused)
806 {
807         done = 1;
808 }
809 
810 static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm)
811 {
812         struct itimerspec new_value;
813         int rc = -1;
814 
815         kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
816         if (kvm->timerfd < 0) {
817                 pr_err("timerfd_create failed\n");
818                 goto out;
819         }
820 
821         new_value.it_value.tv_sec = kvm->display_time;
822         new_value.it_value.tv_nsec = 0;
823         new_value.it_interval.tv_sec = kvm->display_time;
824         new_value.it_interval.tv_nsec = 0;
825 
826         if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) {
827                 pr_err("timerfd_settime failed: %d\n", errno);
828                 close(kvm->timerfd);
829                 goto out;
830         }
831 
832         rc = 0;
833 out:
834         return rc;
835 }
836 
837 static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
838 {
839         uint64_t c;
840         int rc;
841 
842         rc = read(kvm->timerfd, &c, sizeof(uint64_t));
843         if (rc < 0) {
844                 if (errno == EAGAIN)
845                         return 0;
846 
847                 pr_err("Failed to read timer fd: %d\n", errno);
848                 return -1;
849         }
850 
851         if (rc != sizeof(uint64_t)) {
852                 pr_err("Error reading timer fd - invalid size returned\n");
853                 return -1;
854         }
855 
856         if (c != 1)
857                 pr_debug("Missed timer beats: %" PRIu64 "\n", c-1);
858 
859         /* update display */
860         sort_result(kvm);
861         print_result(kvm);
862 
863         /* reset counts */
864         clear_events_cache_stats(kvm->kvm_events_cache);
865         kvm->total_count = 0;
866         kvm->total_time = 0;
867         kvm->lost_events = 0;
868 
869         return 0;
870 }
871 
872 static int fd_set_nonblock(int fd)
873 {
874         long arg = 0;
875 
876         arg = fcntl(fd, F_GETFL);
877         if (arg < 0) {
878                 pr_err("Failed to get current flags for fd %d\n", fd);
879                 return -1;
880         }
881 
882         if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) {
883                 pr_err("Failed to set non-block option on fd %d\n", fd);
884                 return -1;
885         }
886 
887         return 0;
888 }
889 
890 static int perf_kvm__handle_stdin(void)
891 {
892         int c;
893 
894         c = getc(stdin);
895         if (c == 'q')
896                 return 1;
897 
898         return 0;
899 }
900 
901 static int kvm_events_live_report(struct perf_kvm_stat *kvm)
902 {
903         int nr_stdin, ret, err = -EINVAL;
904         struct termios save;
905 
906         /* live flag must be set first */
907         kvm->live = true;
908 
909         ret = cpu_isa_config(kvm);
910         if (ret < 0)
911                 return ret;
912 
913         if (!verify_vcpu(kvm->trace_vcpu) ||
914             !select_key(kvm) ||
915             !register_kvm_events_ops(kvm)) {
916                 goto out;
917         }
918 
919         set_term_quiet_input(&save);
920         init_kvm_event_record(kvm);
921 
922         signal(SIGINT, sig_handler);
923         signal(SIGTERM, sig_handler);
924 
925         /* add timer fd */
926         if (perf_kvm__timerfd_create(kvm) < 0) {
927                 err = -1;
928                 goto out;
929         }
930 
931         if (perf_evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
932                 goto out;
933 
934         nr_stdin = perf_evlist__add_pollfd(kvm->evlist, fileno(stdin));
935         if (nr_stdin < 0)
936                 goto out;
937 
938         if (fd_set_nonblock(fileno(stdin)) != 0)
939                 goto out;
940 
941         /* everything is good - enable the events and process */
942         perf_evlist__enable(kvm->evlist);
943 
944         while (!done) {
945                 struct fdarray *fda = &kvm->evlist->pollfd;
946                 int rc;
947 
948                 rc = perf_kvm__mmap_read(kvm);
949                 if (rc < 0)
950                         break;
951 
952                 err = perf_kvm__handle_timerfd(kvm);
953                 if (err)
954                         goto out;
955 
956                 if (fda->entries[nr_stdin].revents & POLLIN)
957                         done = perf_kvm__handle_stdin();
958 
959                 if (!rc && !done)
960                         err = fdarray__poll(fda, 100);
961         }
962 
963         perf_evlist__disable(kvm->evlist);
964 
965         if (err == 0) {
966                 sort_result(kvm);
967                 print_result(kvm);
968         }
969 
970 out:
971         if (kvm->timerfd >= 0)
972                 close(kvm->timerfd);
973 
974         tcsetattr(0, TCSAFLUSH, &save);
975         return err;
976 }
977 
978 static int kvm_live_open_events(struct perf_kvm_stat *kvm)
979 {
980         int err, rc = -1;
981         struct perf_evsel *pos;
982         struct perf_evlist *evlist = kvm->evlist;
983         char sbuf[STRERR_BUFSIZE];
984 
985         perf_evlist__config(evlist, &kvm->opts, NULL);
986 
987         /*
988          * Note: exclude_{guest,host} do not apply here.
989          *       This command processes KVM tracepoints from host only
990          */
991         evlist__for_each_entry(evlist, pos) {
992                 struct perf_event_attr *attr = &pos->attr;
993 
994                 /* make sure these *are* set */
995                 perf_evsel__set_sample_bit(pos, TID);
996                 perf_evsel__set_sample_bit(pos, TIME);
997                 perf_evsel__set_sample_bit(pos, CPU);
998                 perf_evsel__set_sample_bit(pos, RAW);
999                 /* make sure these are *not*; want as small a sample as possible */
1000                 perf_evsel__reset_sample_bit(pos, PERIOD);
1001                 perf_evsel__reset_sample_bit(pos, IP);
1002                 perf_evsel__reset_sample_bit(pos, CALLCHAIN);
1003                 perf_evsel__reset_sample_bit(pos, ADDR);
1004                 perf_evsel__reset_sample_bit(pos, READ);
1005                 attr->mmap = 0;
1006                 attr->comm = 0;
1007                 attr->task = 0;
1008 
1009                 attr->sample_period = 1;
1010 
1011                 attr->watermark = 0;
1012                 attr->wakeup_events = 1000;
1013 
1014                 /* will enable all once we are ready */
1015                 attr->disabled = 1;
1016         }
1017 
1018         err = perf_evlist__open(evlist);
1019         if (err < 0) {
1020                 printf("Couldn't create the events: %s\n",
1021                        str_error_r(errno, sbuf, sizeof(sbuf)));
1022                 goto out;
1023         }
1024 
1025         if (perf_evlist__mmap(evlist, kvm->opts.mmap_pages, false) < 0) {
1026                 ui__error("Failed to mmap the events: %s\n",
1027                           str_error_r(errno, sbuf, sizeof(sbuf)));
1028                 perf_evlist__close(evlist);
1029                 goto out;
1030         }
1031 
1032         rc = 0;
1033 
1034 out:
1035         return rc;
1036 }
1037 #endif
1038 
1039 static int read_events(struct perf_kvm_stat *kvm)
1040 {
1041         int ret;
1042 
1043         struct perf_tool eops = {
1044                 .sample                 = process_sample_event,
1045                 .comm                   = perf_event__process_comm,
1046                 .ordered_events         = true,
1047         };
1048         struct perf_data_file file = {
1049                 .path = kvm->file_name,
1050                 .mode = PERF_DATA_MODE_READ,
1051                 .force = kvm->force,
1052         };
1053 
1054         kvm->tool = eops;
1055         kvm->session = perf_session__new(&file, false, &kvm->tool);
1056         if (!kvm->session) {
1057                 pr_err("Initializing perf session failed\n");
1058                 return -1;
1059         }
1060 
1061         symbol__init(&kvm->session->header.env);
1062 
1063         if (!perf_session__has_traces(kvm->session, "kvm record")) {
1064                 ret = -EINVAL;
1065                 goto out_delete;
1066         }
1067 
1068         /*
1069          * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
1070          * traced in the old kernel.
1071          */
1072         ret = cpu_isa_config(kvm);
1073         if (ret < 0)
1074                 goto out_delete;
1075 
1076         ret = perf_session__process_events(kvm->session);
1077 
1078 out_delete:
1079         perf_session__delete(kvm->session);
1080         return ret;
1081 }
1082 
1083 static int parse_target_str(struct perf_kvm_stat *kvm)
1084 {
1085         if (kvm->opts.target.pid) {
1086                 kvm->pid_list = intlist__new(kvm->opts.target.pid);
1087                 if (kvm->pid_list == NULL) {
1088                         pr_err("Error parsing process id string\n");
1089                         return -EINVAL;
1090                 }
1091         }
1092 
1093         return 0;
1094 }
1095 
1096 static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
1097 {
1098         int ret = -EINVAL;
1099         int vcpu = kvm->trace_vcpu;
1100 
1101         if (parse_target_str(kvm) != 0)
1102                 goto exit;
1103 
1104         if (!verify_vcpu(vcpu))
1105                 goto exit;
1106 
1107         if (!select_key(kvm))
1108                 goto exit;
1109 
1110         if (!register_kvm_events_ops(kvm))
1111                 goto exit;
1112 
1113         init_kvm_event_record(kvm);
1114         setup_pager();
1115 
1116         ret = read_events(kvm);
1117         if (ret)
1118                 goto exit;
1119 
1120         sort_result(kvm);
1121         print_result(kvm);
1122 
1123 exit:
1124         return ret;
1125 }
1126 
1127 #define STRDUP_FAIL_EXIT(s)             \
1128         ({      char *_p;               \
1129         _p = strdup(s);         \
1130                 if (!_p)                \
1131                         return -ENOMEM; \
1132                 _p;                     \
1133         })
1134 
1135 int __weak setup_kvm_events_tp(struct perf_kvm_stat *kvm __maybe_unused)
1136 {
1137         return 0;
1138 }
1139 
1140 static int
1141 kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
1142 {
1143         unsigned int rec_argc, i, j, events_tp_size;
1144         const char **rec_argv;
1145         const char * const record_args[] = {
1146                 "record",
1147                 "-R",
1148                 "-m", "1024",
1149                 "-c", "1",
1150         };
1151         const char * const kvm_stat_record_usage[] = {
1152                 "perf kvm stat record [<options>]",
1153                 NULL
1154         };
1155         const char * const *events_tp;
1156         int ret;
1157 
1158         events_tp_size = 0;
1159         ret = setup_kvm_events_tp(kvm);
1160         if (ret < 0) {
1161                 pr_err("Unable to setup the kvm tracepoints\n");
1162                 return ret;
1163         }
1164 
1165         for (events_tp = kvm_events_tp; *events_tp; events_tp++)
1166                 events_tp_size++;
1167 
1168         rec_argc = ARRAY_SIZE(record_args) + argc + 2 +
1169                    2 * events_tp_size;
1170         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1171 
1172         if (rec_argv == NULL)
1173                 return -ENOMEM;
1174 
1175         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1176                 rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);
1177 
1178         for (j = 0; j < events_tp_size; j++) {
1179                 rec_argv[i++] = "-e";
1180                 rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]);
1181         }
1182 
1183         rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
1184         rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);
1185 
1186         for (j = 1; j < (unsigned int)argc; j++, i++)
1187                 rec_argv[i] = argv[j];
1188 
1189         set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
1190         set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
1191         set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);
1192 
1193         set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
1194         set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
1195         set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
1196         set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
1197         set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
1198         set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
1199         set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
1200         set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
1201         set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
1202         set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
1203         set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
1204         set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
1205         set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
1206         set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
1207         set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
1208 
1209         record_usage = kvm_stat_record_usage;
1210         return cmd_record(i, rec_argv, NULL);
1211 }
1212 
1213 static int
1214 kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
1215 {
1216         const struct option kvm_events_report_options[] = {
1217                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1218                            "event for reporting: vmexit, "
1219                            "mmio (x86 only), ioport (x86 only)"),
1220                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1221                             "vcpu id to report"),
1222                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1223                             "key for sorting: sample(sort by samples number)"
1224                             " time (sort by avg time)"),
1225                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1226                            "analyze events only for given process id(s)"),
1227                 OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"),
1228                 OPT_END()
1229         };
1230 
1231         const char * const kvm_events_report_usage[] = {
1232                 "perf kvm stat report [<options>]",
1233                 NULL
1234         };
1235 
1236         if (argc) {
1237                 argc = parse_options(argc, argv,
1238                                      kvm_events_report_options,
1239                                      kvm_events_report_usage, 0);
1240                 if (argc)
1241                         usage_with_options(kvm_events_report_usage,
1242                                            kvm_events_report_options);
1243         }
1244 
1245         if (!kvm->opts.target.pid)
1246                 kvm->opts.target.system_wide = true;
1247 
1248         return kvm_events_report_vcpu(kvm);
1249 }
1250 
1251 #ifdef HAVE_TIMERFD_SUPPORT
1252 static struct perf_evlist *kvm_live_event_list(void)
1253 {
1254         struct perf_evlist *evlist;
1255         char *tp, *name, *sys;
1256         int err = -1;
1257         const char * const *events_tp;
1258 
1259         evlist = perf_evlist__new();
1260         if (evlist == NULL)
1261                 return NULL;
1262 
1263         for (events_tp = kvm_events_tp; *events_tp; events_tp++) {
1264 
1265                 tp = strdup(*events_tp);
1266                 if (tp == NULL)
1267                         goto out;
1268 
1269                 /* split tracepoint into subsystem and name */
1270                 sys = tp;
1271                 name = strchr(tp, ':');
1272                 if (name == NULL) {
1273                         pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n",
1274                                *events_tp);
1275                         free(tp);
1276                         goto out;
1277                 }
1278                 *name = '\0';
1279                 name++;
1280 
1281                 if (perf_evlist__add_newtp(evlist, sys, name, NULL)) {
1282                         pr_err("Failed to add %s tracepoint to the list\n", *events_tp);
1283                         free(tp);
1284                         goto out;
1285                 }
1286 
1287                 free(tp);
1288         }
1289 
1290         err = 0;
1291 
1292 out:
1293         if (err) {
1294                 perf_evlist__delete(evlist);
1295                 evlist = NULL;
1296         }
1297 
1298         return evlist;
1299 }
1300 
1301 static int kvm_events_live(struct perf_kvm_stat *kvm,
1302                            int argc, const char **argv)
1303 {
1304         char errbuf[BUFSIZ];
1305         int err;
1306 
1307         const struct option live_options[] = {
1308                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1309                         "record events on existing process id"),
1310                 OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
1311                         "number of mmap data pages",
1312                         perf_evlist__parse_mmap_pages),
1313                 OPT_INCR('v', "verbose", &verbose,
1314                         "be more verbose (show counter open errors, etc)"),
1315                 OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
1316                         "system-wide collection from all CPUs"),
1317                 OPT_UINTEGER('d', "display", &kvm->display_time,
1318                         "time in seconds between display updates"),
1319                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1320                         "event for reporting: "
1321                         "vmexit, mmio (x86 only), ioport (x86 only)"),
1322                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1323                         "vcpu id to report"),
1324                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1325                         "key for sorting: sample(sort by samples number)"
1326                         " time (sort by avg time)"),
1327                 OPT_U64(0, "duration", &kvm->duration,
1328                         "show events other than"
1329                         " HLT (x86 only) or Wait state (s390 only)"
1330                         " that take longer than duration usecs"),
1331                 OPT_UINTEGER(0, "proc-map-timeout", &kvm->opts.proc_map_timeout,
1332                                 "per thread proc mmap processing timeout in ms"),
1333                 OPT_END()
1334         };
1335         const char * const live_usage[] = {
1336                 "perf kvm stat live [<options>]",
1337                 NULL
1338         };
1339         struct perf_data_file file = {
1340                 .mode = PERF_DATA_MODE_WRITE,
1341         };
1342 
1343 
1344         /* event handling */
1345         kvm->tool.sample = process_sample_event;
1346         kvm->tool.comm   = perf_event__process_comm;
1347         kvm->tool.exit   = perf_event__process_exit;
1348         kvm->tool.fork   = perf_event__process_fork;
1349         kvm->tool.lost   = process_lost_event;
1350         kvm->tool.ordered_events = true;
1351         perf_tool__fill_defaults(&kvm->tool);
1352 
1353         /* set defaults */
1354         kvm->display_time = 1;
1355         kvm->opts.user_interval = 1;
1356         kvm->opts.mmap_pages = 512;
1357         kvm->opts.target.uses_mmap = false;
1358         kvm->opts.target.uid_str = NULL;
1359         kvm->opts.target.uid = UINT_MAX;
1360         kvm->opts.proc_map_timeout = 500;
1361 
1362         symbol__init(NULL);
1363         disable_buildid_cache();
1364 
1365         use_browser = 0;
1366 
1367         if (argc) {
1368                 argc = parse_options(argc, argv, live_options,
1369                                      live_usage, 0);
1370                 if (argc)
1371                         usage_with_options(live_usage, live_options);
1372         }
1373 
1374         kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */
1375 
1376         /*
1377          * target related setups
1378          */
1379         err = target__validate(&kvm->opts.target);
1380         if (err) {
1381                 target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ);
1382                 ui__warning("%s", errbuf);
1383         }
1384 
1385         if (target__none(&kvm->opts.target))
1386                 kvm->opts.target.system_wide = true;
1387 
1388 
1389         /*
1390          * generate the event list
1391          */
1392         err = setup_kvm_events_tp(kvm);
1393         if (err < 0) {
1394                 pr_err("Unable to setup the kvm tracepoints\n");
1395                 return err;
1396         }
1397 
1398         kvm->evlist = kvm_live_event_list();
1399         if (kvm->evlist == NULL) {
1400                 err = -1;
1401                 goto out;
1402         }
1403 
1404         symbol_conf.nr_events = kvm->evlist->nr_entries;
1405 
1406         if (perf_evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0)
1407                 usage_with_options(live_usage, live_options);
1408 
1409         /*
1410          * perf session
1411          */
1412         kvm->session = perf_session__new(&file, false, &kvm->tool);
1413         if (kvm->session == NULL) {
1414                 err = -1;
1415                 goto out;
1416         }
1417         kvm->session->evlist = kvm->evlist;
1418         perf_session__set_id_hdr_size(kvm->session);
1419         ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
1420         machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
1421                                     kvm->evlist->threads, false, kvm->opts.proc_map_timeout);
1422         err = kvm_live_open_events(kvm);
1423         if (err)
1424                 goto out;
1425 
1426         err = kvm_events_live_report(kvm);
1427 
1428 out:
1429         perf_session__delete(kvm->session);
1430         kvm->session = NULL;
1431         perf_evlist__delete(kvm->evlist);
1432 
1433         return err;
1434 }
1435 #endif
1436 
1437 static void print_kvm_stat_usage(void)
1438 {
1439         printf("Usage: perf kvm stat <command>\n\n");
1440 
1441         printf("# Available commands:\n");
1442         printf("\trecord: record kvm events\n");
1443         printf("\treport: report statistical data of kvm events\n");
1444         printf("\tlive:   live reporting of statistical data of kvm events\n");
1445 
1446         printf("\nOtherwise, it is the alias of 'perf stat':\n");
1447 }
1448 
1449 static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
1450 {
1451         struct perf_kvm_stat kvm = {
1452                 .file_name = file_name,
1453 
1454                 .trace_vcpu     = -1,
1455                 .report_event   = "vmexit",
1456                 .sort_key       = "sample",
1457 
1458         };
1459 
1460         if (argc == 1) {
1461                 print_kvm_stat_usage();
1462                 goto perf_stat;
1463         }
1464 
1465         if (!strncmp(argv[1], "rec", 3))
1466                 return kvm_events_record(&kvm, argc - 1, argv + 1);
1467 
1468         if (!strncmp(argv[1], "rep", 3))
1469                 return kvm_events_report(&kvm, argc - 1 , argv + 1);
1470 
1471 #ifdef HAVE_TIMERFD_SUPPORT
1472         if (!strncmp(argv[1], "live", 4))
1473                 return kvm_events_live(&kvm, argc - 1 , argv + 1);
1474 #endif
1475 
1476 perf_stat:
1477         return cmd_stat(argc, argv, NULL);
1478 }
1479 #endif /* HAVE_KVM_STAT_SUPPORT */
1480 
1481 static int __cmd_record(const char *file_name, int argc, const char **argv)
1482 {
1483         int rec_argc, i = 0, j;
1484         const char **rec_argv;
1485 
1486         rec_argc = argc + 2;
1487         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1488         rec_argv[i++] = strdup("record");
1489         rec_argv[i++] = strdup("-o");
1490         rec_argv[i++] = strdup(file_name);
1491         for (j = 1; j < argc; j++, i++)
1492                 rec_argv[i] = argv[j];
1493 
1494         BUG_ON(i != rec_argc);
1495 
1496         return cmd_record(i, rec_argv, NULL);
1497 }
1498 
1499 static int __cmd_report(const char *file_name, int argc, const char **argv)
1500 {
1501         int rec_argc, i = 0, j;
1502         const char **rec_argv;
1503 
1504         rec_argc = argc + 2;
1505         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1506         rec_argv[i++] = strdup("report");
1507         rec_argv[i++] = strdup("-i");
1508         rec_argv[i++] = strdup(file_name);
1509         for (j = 1; j < argc; j++, i++)
1510                 rec_argv[i] = argv[j];
1511 
1512         BUG_ON(i != rec_argc);
1513 
1514         return cmd_report(i, rec_argv, NULL);
1515 }
1516 
1517 static int
1518 __cmd_buildid_list(const char *file_name, int argc, const char **argv)
1519 {
1520         int rec_argc, i = 0, j;
1521         const char **rec_argv;
1522 
1523         rec_argc = argc + 2;
1524         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1525         rec_argv[i++] = strdup("buildid-list");
1526         rec_argv[i++] = strdup("-i");
1527         rec_argv[i++] = strdup(file_name);
1528         for (j = 1; j < argc; j++, i++)
1529                 rec_argv[i] = argv[j];
1530 
1531         BUG_ON(i != rec_argc);
1532 
1533         return cmd_buildid_list(i, rec_argv, NULL);
1534 }
1535 
1536 int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
1537 {
1538         const char *file_name = NULL;
1539         const struct option kvm_options[] = {
1540                 OPT_STRING('i', "input", &file_name, "file",
1541                            "Input file name"),
1542                 OPT_STRING('o', "output", &file_name, "file",
1543                            "Output file name"),
1544                 OPT_BOOLEAN(0, "guest", &perf_guest,
1545                             "Collect guest os data"),
1546                 OPT_BOOLEAN(0, "host", &perf_host,
1547                             "Collect host os data"),
1548                 OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
1549                            "guest mount directory under which every guest os"
1550                            " instance has a subdir"),
1551                 OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
1552                            "file", "file saving guest os vmlinux"),
1553                 OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
1554                            "file", "file saving guest os /proc/kallsyms"),
1555                 OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
1556                            "file", "file saving guest os /proc/modules"),
1557                 OPT_INCR('v', "verbose", &verbose,
1558                             "be more verbose (show counter open errors, etc)"),
1559                 OPT_END()
1560         };
1561 
1562         const char *const kvm_subcommands[] = { "top", "record", "report", "diff",
1563                                                 "buildid-list", "stat", NULL };
1564         const char *kvm_usage[] = { NULL, NULL };
1565 
1566         perf_host  = 0;
1567         perf_guest = 1;
1568 
1569         argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, kvm_usage,
1570                                         PARSE_OPT_STOP_AT_NON_OPTION);
1571         if (!argc)
1572                 usage_with_options(kvm_usage, kvm_options);
1573 
1574         if (!perf_host)
1575                 perf_guest = 1;
1576 
1577         if (!file_name) {
1578                 file_name = get_filename_for_perf_kvm();
1579 
1580                 if (!file_name) {
1581                         pr_err("Failed to allocate memory for filename\n");
1582                         return -ENOMEM;
1583                 }
1584         }
1585 
1586         if (!strncmp(argv[0], "rec", 3))
1587                 return __cmd_record(file_name, argc, argv);
1588         else if (!strncmp(argv[0], "rep", 3))
1589                 return __cmd_report(file_name, argc, argv);
1590         else if (!strncmp(argv[0], "diff", 4))
1591                 return cmd_diff(argc, argv, NULL);
1592         else if (!strncmp(argv[0], "top", 3))
1593                 return cmd_top(argc, argv, NULL);
1594         else if (!strncmp(argv[0], "buildid-list", 12))
1595                 return __cmd_buildid_list(file_name, argc, argv);
1596 #ifdef HAVE_KVM_STAT_SUPPORT
1597         else if (!strncmp(argv[0], "stat", 4))
1598                 return kvm_cmd_stat(file_name, argc, argv);
1599 #endif
1600         else
1601                 usage_with_options(kvm_usage, kvm_options);
1602 
1603         return 0;
1604 }
1605 

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