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