tools/perf/builtin-kvm.c

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