tools/perf/builtin-kvm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "builtin.h"
   3 #include "perf.h"
   4
   5 #include "util/build-id.h"
   6 #include "util/evsel.h"
   7 #include "util/evlist.h"
   8 #include "util/mmap.h"
   9 #include "util/term.h"
  10 #include "util/symbol.h"
  11 #include "util/thread.h"
  12 #include "util/header.h"
  13 #include "util/session.h"
  14 #include "util/intlist.h"
  15 #include <subcmd/pager.h>
  16 #include <subcmd/parse-options.h>
  17 #include "util/trace-event.h"
  18 #include "util/debug.h"
  19 #include "util/tool.h"
  20 #include "util/stat.h"
  21 #include "util/synthetic-events.h"
  22 #include "util/top.h"
  23 #include "util/data.h"
  24 #include "util/ordered-events.h"
  25 #include "util/kvm-stat.h"
  26 #include "ui/ui.h"
  27 #include "util/string2.h"
  28
  29 #include <sys/prctl.h>
  30 #ifdef HAVE_TIMERFD_SUPPORT
  31 #include <sys/timerfd.h>
  32 #endif
  33 #include <sys/time.h>
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <fcntl.h>
  37
  38 #include <linux/err.h>
  39 #include <linux/kernel.h>
  40 #include <linux/string.h>
  41 #include <linux/time64.h>
  42 #include <linux/zalloc.h>
  43 #include <errno.h>
  44 #include <inttypes.h>
  45 #include <poll.h>
  46 #include <termios.h>
  47 #include <semaphore.h>
  48 #include <signal.h>
  49 #include <math.h>
  50 #include <perf/mmap.h>
  51
  52 static const char *get_filename_for_perf_kvm(void)
  53 {
  54         const char *filename;
  55
  56         if (perf_host && !perf_guest)
  57                 filename = strdup("perf.data.host");
  58         else if (!perf_host && perf_guest)
  59                 filename = strdup("perf.data.guest");
  60         else
  61                 filename = strdup("perf.data.kvm");
  62
  63         return filename;
  64 }
  65
  66 #ifdef HAVE_KVM_STAT_SUPPORT
  67
  68 void exit_event_get_key(struct evsel *evsel,
  69                         struct perf_sample *sample,
  70                         struct event_key *key)
  71 {
  72         key->info = 0;
  73         key->key  = evsel__intval(evsel, sample, kvm_exit_reason);
  74 }
  75
  76 bool kvm_exit_event(struct evsel *evsel)
  77 {
  78         return !strcmp(evsel->name, kvm_exit_trace);
  79 }
  80
  81 bool exit_event_begin(struct evsel *evsel,
  82                       struct perf_sample *sample, struct event_key *key)
  83 {
  84         if (kvm_exit_event(evsel)) {
  85                 exit_event_get_key(evsel, sample, key);
  86                 return true;
  87         }
  88
  89         return false;
  90 }
  91
  92 bool kvm_entry_event(struct evsel *evsel)
  93 {
  94         return !strcmp(evsel->name, kvm_entry_trace);
  95 }
  96
  97 bool exit_event_end(struct evsel *evsel,
  98                     struct perf_sample *sample __maybe_unused,
  99                     struct event_key *key __maybe_unused)
 100 {
 101         return kvm_entry_event(evsel);
 102 }
 103
 104 static const char *get_exit_reason(struct perf_kvm_stat *kvm,
 105                                    struct exit_reasons_table *tbl,
 106                                    u64 exit_code)
 107 {
 108         while (tbl->reason != NULL) {
 109                 if (tbl->exit_code == exit_code)
 110                         return tbl->reason;
 111                 tbl++;
 112         }
 113
 114         pr_err("unknown kvm exit code:%lld on %s\n",
 115                 (unsigned long long)exit_code, kvm->exit_reasons_isa);
 116         return "UNKNOWN";
 117 }
 118
 119 void exit_event_decode_key(struct perf_kvm_stat *kvm,
 120                            struct event_key *key,
 121                            char *decode)
 122 {
 123         const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
 124                                                   key->key);
 125
 126         scnprintf(decode, decode_str_len, "%s", exit_reason);
 127 }
 128
 129 static bool register_kvm_events_ops(struct perf_kvm_stat *kvm)
 130 {
 131         struct kvm_reg_events_ops *events_ops = kvm_reg_events_ops;
 132
 133         for (events_ops = kvm_reg_events_ops; events_ops->name; events_ops++) {
 134                 if (!strcmp(events_ops->name, kvm->report_event)) {
 135                         kvm->events_ops = events_ops->ops;
 136                         return true;
 137                 }
 138         }
 139
 140         return false;
 141 }
 142
 143 struct vcpu_event_record {
 144         int vcpu_id;
 145         u64 start_time;
 146         struct kvm_event *last_event;
 147 };
 148
 149
 150 static void init_kvm_event_record(struct perf_kvm_stat *kvm)
 151 {
 152         unsigned int i;
 153
 154         for (i = 0; i < EVENTS_CACHE_SIZE; i++)
 155                 INIT_LIST_HEAD(&kvm->kvm_events_cache[i]);
 156 }
 157
 158 #ifdef HAVE_TIMERFD_SUPPORT
 159 static void clear_events_cache_stats(struct list_head *kvm_events_cache)
 160 {
 161         struct list_head *head;
 162         struct kvm_event *event;
 163         unsigned int i;
 164         int j;
 165
 166         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
 167                 head = &kvm_events_cache[i];
 168                 list_for_each_entry(event, head, hash_entry) {
 169                         /* reset stats for event */
 170                         event->total.time = 0;
 171                         init_stats(&event->total.stats);
 172
 173                         for (j = 0; j < event->max_vcpu; ++j) {
 174                                 event->vcpu[j].time = 0;
 175                                 init_stats(&event->vcpu[j].stats);
 176                         }
 177                 }
 178         }
 179 }
 180 #endif
 181
 182 static int kvm_events_hash_fn(u64 key)
 183 {
 184         return key & (EVENTS_CACHE_SIZE - 1);
 185 }
 186
 187 static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
 188 {
 189         int old_max_vcpu = event->max_vcpu;
 190         void *prev;
 191
 192         if (vcpu_id < event->max_vcpu)
 193                 return true;
 194
 195         while (event->max_vcpu <= vcpu_id)
 196                 event->max_vcpu += DEFAULT_VCPU_NUM;
 197
 198         prev = event->vcpu;
 199         event->vcpu = realloc(event->vcpu,
 200                               event->max_vcpu * sizeof(*event->vcpu));
 201         if (!event->vcpu) {
 202                 free(prev);
 203                 pr_err("Not enough memory\n");
 204                 return false;
 205         }
 206
 207         memset(event->vcpu + old_max_vcpu, 0,
 208                (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
 209         return true;
 210 }
 211
 212 static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
 213 {
 214         struct kvm_event *event;
 215
 216         event = zalloc(sizeof(*event));
 217         if (!event) {
 218                 pr_err("Not enough memory\n");
 219                 return NULL;
 220         }
 221
 222         event->key = *key;
 223         init_stats(&event->total.stats);
 224         return event;
 225 }
 226
 227 static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm,
 228                                                struct event_key *key)
 229 {
 230         struct kvm_event *event;
 231         struct list_head *head;
 232
 233         BUG_ON(key->key == INVALID_KEY);
 234
 235         head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)];
 236         list_for_each_entry(event, head, hash_entry) {
 237                 if (event->key.key == key->key && event->key.info == key->info)
 238                         return event;
 239         }
 240
 241         event = kvm_alloc_init_event(key);
 242         if (!event)
 243                 return NULL;
 244
 245         list_add(&event->hash_entry, head);
 246         return event;
 247 }
 248
 249 static bool handle_begin_event(struct perf_kvm_stat *kvm,
 250                                struct vcpu_event_record *vcpu_record,
 251                                struct event_key *key, u64 timestamp)
 252 {
 253         struct kvm_event *event = NULL;
 254
 255         if (key->key != INVALID_KEY)
 256                 event = find_create_kvm_event(kvm, key);
 257
 258         vcpu_record->last_event = event;
 259         vcpu_record->start_time = timestamp;
 260         return true;
 261 }
 262
 263 static void
 264 kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff)
 265 {
 266         kvm_stats->time += time_diff;
 267         update_stats(&kvm_stats->stats, time_diff);
 268 }
 269
 270 static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
 271 {
 272         struct kvm_event_stats *kvm_stats = &event->total;
 273
 274         if (vcpu_id != -1)
 275                 kvm_stats = &event->vcpu[vcpu_id];
 276
 277         return rel_stddev_stats(stddev_stats(&kvm_stats->stats),
 278                                 avg_stats(&kvm_stats->stats));
 279 }
 280
 281 static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
 282                              u64 time_diff)
 283 {
 284         if (vcpu_id == -1) {
 285                 kvm_update_event_stats(&event->total, time_diff);
 286                 return true;
 287         }
 288
 289         if (!kvm_event_expand(event, vcpu_id))
 290                 return false;
 291
 292         kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
 293         return true;
 294 }
 295
 296 static bool is_child_event(struct perf_kvm_stat *kvm,
 297                            struct evsel *evsel,
 298                            struct perf_sample *sample,
 299                            struct event_key *key)
 300 {
 301         struct child_event_ops *child_ops;
 302
 303         child_ops = kvm->events_ops->child_ops;
 304
 305         if (!child_ops)
 306                 return false;
 307
 308         for (; child_ops->name; child_ops++) {
 309                 if (!strcmp(evsel->name, child_ops->name)) {
 310                         child_ops->get_key(evsel, sample, key);
 311                         return true;
 312                 }
 313         }
 314
 315         return false;
 316 }
 317
 318 static bool handle_child_event(struct perf_kvm_stat *kvm,
 319                                struct vcpu_event_record *vcpu_record,
 320                                struct event_key *key,
 321                                struct perf_sample *sample __maybe_unused)
 322 {
 323         struct kvm_event *event = NULL;
 324
 325         if (key->key != INVALID_KEY)
 326                 event = find_create_kvm_event(kvm, key);
 327
 328         vcpu_record->last_event = event;
 329
 330         return true;
 331 }
 332
 333 static bool skip_event(const char *event)
 334 {
 335         const char * const *skip_events;
 336
 337         for (skip_events = kvm_skip_events; *skip_events; skip_events++)
 338                 if (!strcmp(event, *skip_events))
 339                         return true;
 340
 341         return false;
 342 }
 343
 344 static bool handle_end_event(struct perf_kvm_stat *kvm,
 345                              struct vcpu_event_record *vcpu_record,
 346                              struct event_key *key,
 347                              struct perf_sample *sample)
 348 {
 349         struct kvm_event *event;
 350         u64 time_begin, time_diff;
 351         int vcpu;
 352
 353         if (kvm->trace_vcpu == -1)
 354                 vcpu = -1;
 355         else
 356                 vcpu = vcpu_record->vcpu_id;
 357
 358         event = vcpu_record->last_event;
 359         time_begin = vcpu_record->start_time;
 360
 361         /* The begin event is not caught. */
 362         if (!time_begin)
 363                 return true;
 364
 365         /*
 366          * In some case, the 'begin event' only records the start timestamp,
 367          * the actual event is recognized in the 'end event' (e.g. mmio-event).
 368          */
 369
 370         /* Both begin and end events did not get the key. */
 371         if (!event && key->key == INVALID_KEY)
 372                 return true;
 373
 374         if (!event)
 375                 event = find_create_kvm_event(kvm, key);
 376
 377         if (!event)
 378                 return false;
 379
 380         vcpu_record->last_event = NULL;
 381         vcpu_record->start_time = 0;
 382
 383         /* seems to happen once in a while during live mode */
 384         if (sample->time < time_begin) {
 385                 pr_debug("End time before begin time; skipping event.\n");
 386                 return true;
 387         }
 388
 389         time_diff = sample->time - time_begin;
 390
 391         if (kvm->duration && time_diff > kvm->duration) {
 392                 char decode[decode_str_len];
 393
 394                 kvm->events_ops->decode_key(kvm, &event->key, decode);
 395                 if (!skip_event(decode)) {
 396                         pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
 397                                  sample->time, sample->pid, vcpu_record->vcpu_id,
 398                                  decode, time_diff / NSEC_PER_USEC);
 399                 }
 400         }
 401
 402         return update_kvm_event(event, vcpu, time_diff);
 403 }
 404
 405 static
 406 struct vcpu_event_record *per_vcpu_record(struct thread *thread,
 407                                           struct evsel *evsel,
 408                                           struct perf_sample *sample)
 409 {
 410         /* Only kvm_entry records vcpu id. */
 411         if (!thread__priv(thread) && kvm_entry_event(evsel)) {
 412                 struct vcpu_event_record *vcpu_record;
 413
 414                 vcpu_record = zalloc(sizeof(*vcpu_record));
 415                 if (!vcpu_record) {
 416                         pr_err("%s: Not enough memory\n", __func__);
 417                         return NULL;
 418                 }
 419
 420                 vcpu_record->vcpu_id = evsel__intval(evsel, sample, vcpu_id_str);
 421                 thread__set_priv(thread, vcpu_record);
 422         }
 423
 424         return thread__priv(thread);
 425 }
 426
 427 static bool handle_kvm_event(struct perf_kvm_stat *kvm,
 428                              struct thread *thread,
 429                              struct evsel *evsel,
 430                              struct perf_sample *sample)
 431 {
 432         struct vcpu_event_record *vcpu_record;
 433         struct event_key key = { .key = INVALID_KEY,
 434                                  .exit_reasons = kvm->exit_reasons };
 435
 436         vcpu_record = per_vcpu_record(thread, evsel, sample);
 437         if (!vcpu_record)
 438                 return true;
 439
 440         /* only process events for vcpus user cares about */
 441         if ((kvm->trace_vcpu != -1) &&
 442             (kvm->trace_vcpu != vcpu_record->vcpu_id))
 443                 return true;
 444
 445         if (kvm->events_ops->is_begin_event(evsel, sample, &key))
 446                 return handle_begin_event(kvm, vcpu_record, &key, sample->time);
 447
 448         if (is_child_event(kvm, evsel, sample, &key))
 449                 return handle_child_event(kvm, vcpu_record, &key, sample);
 450
 451         if (kvm->events_ops->is_end_event(evsel, sample, &key))
 452                 return handle_end_event(kvm, vcpu_record, &key, sample);
 453
 454         return true;
 455 }
 456
 457 #define GET_EVENT_KEY(func, field)                                      \
 458 static u64 get_event_ ##func(struct kvm_event *event, int vcpu)         \
 459 {                                                                       \
 460         if (vcpu == -1)                                                 \
 461                 return event->total.field;                              \
 462                                                                         \
 463         if (vcpu >= event->max_vcpu)                                    \
 464                 return 0;                                               \
 465                                                                         \
 466         return event->vcpu[vcpu].field;                                 \
 467 }
 468
 469 #define COMPARE_EVENT_KEY(func, field)                                  \
 470 GET_EVENT_KEY(func, field)                                              \
 471 static int compare_kvm_event_ ## func(struct kvm_event *one,            \
 472                                         struct kvm_event *two, int vcpu)\
 473 {                                                                       \
 474         return get_event_ ##func(one, vcpu) >                           \
 475                                 get_event_ ##func(two, vcpu);           \
 476 }
 477
 478 GET_EVENT_KEY(time, time);
 479 COMPARE_EVENT_KEY(count, stats.n);
 480 COMPARE_EVENT_KEY(mean, stats.mean);
 481 GET_EVENT_KEY(max, stats.max);
 482 GET_EVENT_KEY(min, stats.min);
 483
 484 #define DEF_SORT_NAME_KEY(name, compare_key)                            \
 485         { #name, compare_kvm_event_ ## compare_key }
 486
 487 static struct kvm_event_key keys[] = {
 488         DEF_SORT_NAME_KEY(sample, count),
 489         DEF_SORT_NAME_KEY(time, mean),
 490         { NULL, NULL }
 491 };
 492
 493 static bool select_key(struct perf_kvm_stat *kvm)
 494 {
 495         int i;
 496
 497         for (i = 0; keys[i].name; i++) {
 498                 if (!strcmp(keys[i].name, kvm->sort_key)) {
 499                         kvm->compare = keys[i].key;
 500                         return true;
 501                 }
 502         }
 503
 504         pr_err("Unknown compare key:%s\n", kvm->sort_key);
 505         return false;
 506 }
 507
 508 static void insert_to_result(struct rb_root *result, struct kvm_event *event,
 509                              key_cmp_fun bigger, int vcpu)
 510 {
 511         struct rb_node **rb = &result->rb_node;
 512         struct rb_node *parent = NULL;
 513         struct kvm_event *p;
 514
 515         while (*rb) {
 516                 p = container_of(*rb, struct kvm_event, rb);
 517                 parent = *rb;
 518
 519                 if (bigger(event, p, vcpu))
 520                         rb = &(*rb)->rb_left;
 521                 else
 522                         rb = &(*rb)->rb_right;
 523         }
 524
 525         rb_link_node(&event->rb, parent, rb);
 526         rb_insert_color(&event->rb, result);
 527 }
 528
 529 static void
 530 update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event)
 531 {
 532         int vcpu = kvm->trace_vcpu;
 533
 534         kvm->total_count += get_event_count(event, vcpu);
 535         kvm->total_time += get_event_time(event, vcpu);
 536 }
 537
 538 static bool event_is_valid(struct kvm_event *event, int vcpu)
 539 {
 540         return !!get_event_count(event, vcpu);
 541 }
 542
 543 static void sort_result(struct perf_kvm_stat *kvm)
 544 {
 545         unsigned int i;
 546         int vcpu = kvm->trace_vcpu;
 547         struct kvm_event *event;
 548
 549         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
 550                 list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) {
 551                         if (event_is_valid(event, vcpu)) {
 552                                 update_total_count(kvm, event);
 553                                 insert_to_result(&kvm->result, event,
 554                                                  kvm->compare, vcpu);
 555                         }
 556                 }
 557         }
 558 }
 559
 560 /* returns left most element of result, and erase it */
 561 static struct kvm_event *pop_from_result(struct rb_root *result)
 562 {
 563         struct rb_node *node = rb_first(result);
 564
 565         if (!node)
 566                 return NULL;
 567
 568         rb_erase(node, result);
 569         return container_of(node, struct kvm_event, rb);
 570 }
 571
 572 static void print_vcpu_info(struct perf_kvm_stat *kvm)
 573 {
 574         int vcpu = kvm->trace_vcpu;
 575
 576         pr_info("Analyze events for ");
 577
 578         if (kvm->opts.target.system_wide)
 579                 pr_info("all VMs, ");
 580         else if (kvm->opts.target.pid)
 581                 pr_info("pid(s) %s, ", kvm->opts.target.pid);
 582         else
 583                 pr_info("dazed and confused on what is monitored, ");
 584
 585         if (vcpu == -1)
 586                 pr_info("all VCPUs:\n\n");
 587         else
 588                 pr_info("VCPU %d:\n\n", vcpu);
 589 }
 590
 591 static void show_timeofday(void)
 592 {
 593         char date[64];
 594         struct timeval tv;
 595         struct tm ltime;
 596
 597         gettimeofday(&tv, NULL);
 598         if (localtime_r(&tv.tv_sec, &ltime)) {
 599                 strftime(date, sizeof(date), "%H:%M:%S", &ltime);
 600                 pr_info("%s.%06ld", date, tv.tv_usec);
 601         } else
 602                 pr_info("00:00:00.000000");
 603
 604         return;
 605 }
 606
 607 static void print_result(struct perf_kvm_stat *kvm)
 608 {
 609         char decode[decode_str_len];
 610         struct kvm_event *event;
 611         int vcpu = kvm->trace_vcpu;
 612
 613         if (kvm->live) {
 614                 puts(CONSOLE_CLEAR);
 615                 show_timeofday();
 616         }
 617
 618         pr_info("\n\n");
 619         print_vcpu_info(kvm);
 620         pr_info("%*s ", decode_str_len, kvm->events_ops->name);
 621         pr_info("%10s ", "Samples");
 622         pr_info("%9s ", "Samples%");
 623
 624         pr_info("%9s ", "Time%");
 625         pr_info("%11s ", "Min Time");
 626         pr_info("%11s ", "Max Time");
 627         pr_info("%16s ", "Avg time");
 628         pr_info("\n\n");
 629
 630         while ((event = pop_from_result(&kvm->result))) {
 631                 u64 ecount, etime, max, min;
 632
 633                 ecount = get_event_count(event, vcpu);
 634                 etime = get_event_time(event, vcpu);
 635                 max = get_event_max(event, vcpu);
 636                 min = get_event_min(event, vcpu);
 637
 638                 kvm->events_ops->decode_key(kvm, &event->key, decode);
 639                 pr_info("%*s ", decode_str_len, decode);
 640                 pr_info("%10llu ", (unsigned long long)ecount);
 641                 pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
 642                 pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
 643                 pr_info("%9.2fus ", (double)min / NSEC_PER_USEC);
 644                 pr_info("%9.2fus ", (double)max / NSEC_PER_USEC);
 645                 pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount / NSEC_PER_USEC,
 646                         kvm_event_rel_stddev(vcpu, event));
 647                 pr_info("\n");
 648         }
 649
 650         pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n",
 651                 kvm->total_count, kvm->total_time / (double)NSEC_PER_USEC);
 652
 653         if (kvm->lost_events)
 654                 pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events);
 655 }
 656
 657 #ifdef HAVE_TIMERFD_SUPPORT
 658 static int process_lost_event(struct perf_tool *tool,
 659                               union perf_event *event __maybe_unused,
 660                               struct perf_sample *sample __maybe_unused,
 661                               struct machine *machine __maybe_unused)
 662 {
 663         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, tool);
 664
 665         kvm->lost_events++;
 666         return 0;
 667 }
 668 #endif
 669
 670 static bool skip_sample(struct perf_kvm_stat *kvm,
 671                         struct perf_sample *sample)
 672 {
 673         if (kvm->pid_list && intlist__find(kvm->pid_list, sample->pid) == NULL)
 674                 return true;
 675
 676         return false;
 677 }
 678
 679 static int process_sample_event(struct perf_tool *tool,
 680                                 union perf_event *event,
 681                                 struct perf_sample *sample,
 682                                 struct evsel *evsel,
 683                                 struct machine *machine)
 684 {
 685         int err = 0;
 686         struct thread *thread;
 687         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat,
 688                                                  tool);
 689
 690         if (skip_sample(kvm, sample))
 691                 return 0;
 692
 693         thread = machine__findnew_thread(machine, sample->pid, sample->tid);
 694         if (thread == NULL) {
 695                 pr_debug("problem processing %d event, skipping it.\n",
 696                         event->header.type);
 697                 return -1;
 698         }
 699
 700         if (!handle_kvm_event(kvm, thread, evsel, sample))
 701                 err = -1;
 702
 703         thread__put(thread);
 704         return err;
 705 }
 706
 707 static int cpu_isa_config(struct perf_kvm_stat *kvm)
 708 {
 709         char buf[128], *cpuid;
 710         int err;
 711
 712         if (kvm->live) {
 713                 err = get_cpuid(buf, sizeof(buf));
 714                 if (err != 0) {
 715                         pr_err("Failed to look up CPU type: %s\n",
 716                                str_error_r(err, buf, sizeof(buf)));
 717                         return -err;
 718                 }
 719                 cpuid = buf;
 720         } else
 721                 cpuid = kvm->session->header.env.cpuid;
 722
 723         if (!cpuid) {
 724                 pr_err("Failed to look up CPU type\n");
 725                 return -EINVAL;
 726         }
 727
 728         err = cpu_isa_init(kvm, cpuid);
 729         if (err == -ENOTSUP)
 730                 pr_err("CPU %s is not supported.\n", cpuid);
 731
 732         return err;
 733 }
 734
 735 static bool verify_vcpu(int vcpu)
 736 {
 737         if (vcpu != -1 && vcpu < 0) {
 738                 pr_err("Invalid vcpu:%d.\n", vcpu);
 739                 return false;
 740         }
 741
 742         return true;
 743 }
 744
 745 #ifdef HAVE_TIMERFD_SUPPORT
 746 /* keeping the max events to a modest level to keep
 747  * the processing of samples per mmap smooth.
 748  */
 749 #define PERF_KVM__MAX_EVENTS_PER_MMAP  25
 750
 751 static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
 752                                    u64 *mmap_time)
 753 {
 754         struct evlist *evlist = kvm->evlist;
 755         union perf_event *event;
 756         struct mmap *md;
 757         u64 timestamp;
 758         s64 n = 0;
 759         int err;
 760
 761         *mmap_time = ULLONG_MAX;
 762         md = &evlist->mmap[idx];
 763         err = perf_mmap__read_init(&md->core);
 764         if (err < 0)
 765                 return (err == -EAGAIN) ? 0 : -1;
 766
 767         while ((event = perf_mmap__read_event(&md->core)) != NULL) {
 768                 err = evlist__parse_sample_timestamp(evlist, event, &timestamp);
 769                 if (err) {
 770                         perf_mmap__consume(&md->core);
 771                         pr_err("Failed to parse sample\n");
 772                         return -1;
 773                 }
 774
 775                 err = perf_session__queue_event(kvm->session, event, timestamp, 0, NULL);
 776                 /*
 777                  * FIXME: Here we can't consume the event, as perf_session__queue_event will
 778                  *        point to it, and it'll get possibly overwritten by the kernel.
 779                  */
 780                 perf_mmap__consume(&md->core);
 781
 782                 if (err) {
 783                         pr_err("Failed to enqueue sample: %d\n", err);
 784                         return -1;
 785                 }
 786
 787                 /* save time stamp of our first sample for this mmap */
 788                 if (n == 0)
 789                         *mmap_time = timestamp;
 790
 791                 /* limit events per mmap handled all at once */
 792                 n++;
 793                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
 794                         break;
 795         }
 796
 797         perf_mmap__read_done(&md->core);
 798         return n;
 799 }
 800
 801 static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm)
 802 {
 803         int i, err, throttled = 0;
 804         s64 n, ntotal = 0;
 805         u64 flush_time = ULLONG_MAX, mmap_time;
 806
 807         for (i = 0; i < kvm->evlist->core.nr_mmaps; i++) {
 808                 n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time);
 809                 if (n < 0)
 810                         return -1;
 811
 812                 /* flush time is going to be the minimum of all the individual
 813                  * mmap times. Essentially, we flush all the samples queued up
 814                  * from the last pass under our minimal start time -- that leaves
 815                  * a very small race for samples to come in with a lower timestamp.
 816                  * The ioctl to return the perf_clock timestamp should close the
 817                  * race entirely.
 818                  */
 819                 if (mmap_time < flush_time)
 820                         flush_time = mmap_time;
 821
 822                 ntotal += n;
 823                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
 824                         throttled = 1;
 825         }
 826
 827         /* flush queue after each round in which we processed events */
 828         if (ntotal) {
 829                 struct ordered_events *oe = &kvm->session->ordered_events;
 830
 831                 oe->next_flush = flush_time;
 832                 err = ordered_events__flush(oe, OE_FLUSH__ROUND);
 833                 if (err) {
 834                         if (kvm->lost_events)
 835                                 pr_info("\nLost events: %" PRIu64 "\n\n",
 836                                         kvm->lost_events);
 837                         return err;
 838                 }
 839         }
 840
 841         return throttled;
 842 }
 843
 844 static volatile int done;
 845
 846 static void sig_handler(int sig __maybe_unused)
 847 {
 848         done = 1;
 849 }
 850
 851 static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm)
 852 {
 853         struct itimerspec new_value;
 854         int rc = -1;
 855
 856         kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
 857         if (kvm->timerfd < 0) {
 858                 pr_err("timerfd_create failed\n");
 859                 goto out;
 860         }
 861
 862         new_value.it_value.tv_sec = kvm->display_time;
 863         new_value.it_value.tv_nsec = 0;
 864         new_value.it_interval.tv_sec = kvm->display_time;
 865         new_value.it_interval.tv_nsec = 0;
 866
 867         if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) {
 868                 pr_err("timerfd_settime failed: %d\n", errno);
 869                 close(kvm->timerfd);
 870                 goto out;
 871         }
 872
 873         rc = 0;
 874 out:
 875         return rc;
 876 }
 877
 878 static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
 879 {
 880         uint64_t c;
 881         int rc;
 882
 883         rc = read(kvm->timerfd, &c, sizeof(uint64_t));
 884         if (rc < 0) {
 885                 if (errno == EAGAIN)
 886                         return 0;
 887
 888                 pr_err("Failed to read timer fd: %d\n", errno);
 889                 return -1;
 890         }
 891
 892         if (rc != sizeof(uint64_t)) {
 893                 pr_err("Error reading timer fd - invalid size returned\n");
 894                 return -1;
 895         }
 896
 897         if (c != 1)
 898                 pr_debug("Missed timer beats: %" PRIu64 "\n", c-1);
 899
 900         /* update display */
 901         sort_result(kvm);
 902         print_result(kvm);
 903
 904         /* reset counts */
 905         clear_events_cache_stats(kvm->kvm_events_cache);
 906         kvm->total_count = 0;
 907         kvm->total_time = 0;
 908         kvm->lost_events = 0;
 909
 910         return 0;
 911 }
 912
 913 static int fd_set_nonblock(int fd)
 914 {
 915         long arg = 0;
 916
 917         arg = fcntl(fd, F_GETFL);
 918         if (arg < 0) {
 919                 pr_err("Failed to get current flags for fd %d\n", fd);
 920                 return -1;
 921         }
 922
 923         if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) {
 924                 pr_err("Failed to set non-block option on fd %d\n", fd);
 925                 return -1;
 926         }
 927
 928         return 0;
 929 }
 930
 931 static int perf_kvm__handle_stdin(void)
 932 {
 933         int c;
 934
 935         c = getc(stdin);
 936         if (c == 'q')
 937                 return 1;
 938
 939         return 0;
 940 }
 941
 942 static int kvm_events_live_report(struct perf_kvm_stat *kvm)
 943 {
 944         int nr_stdin, ret, err = -EINVAL;
 945         struct termios save;
 946
 947         /* live flag must be set first */
 948         kvm->live = true;
 949
 950         ret = cpu_isa_config(kvm);
 951         if (ret < 0)
 952                 return ret;
 953
 954         if (!verify_vcpu(kvm->trace_vcpu) ||
 955             !select_key(kvm) ||
 956             !register_kvm_events_ops(kvm)) {
 957                 goto out;
 958         }
 959
 960         set_term_quiet_input(&save);
 961         init_kvm_event_record(kvm);
 962
 963         signal(SIGINT, sig_handler);
 964         signal(SIGTERM, sig_handler);
 965
 966         /* add timer fd */
 967         if (perf_kvm__timerfd_create(kvm) < 0) {
 968                 err = -1;
 969                 goto out;
 970         }
 971
 972         if (evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
 973                 goto out;
 974
 975         nr_stdin = evlist__add_pollfd(kvm->evlist, fileno(stdin));
 976         if (nr_stdin < 0)
 977                 goto out;
 978
 979         if (fd_set_nonblock(fileno(stdin)) != 0)
 980                 goto out;
 981
 982         /* everything is good - enable the events and process */
 983         evlist__enable(kvm->evlist);
 984
 985         while (!done) {
 986                 struct fdarray *fda = &kvm->evlist->core.pollfd;
 987                 int rc;
 988
 989                 rc = perf_kvm__mmap_read(kvm);
 990                 if (rc < 0)
 991                         break;
 992
 993                 err = perf_kvm__handle_timerfd(kvm);
 994                 if (err)
 995                         goto out;
 996
 997                 if (fda->entries[nr_stdin].revents & POLLIN)
 998                         done = perf_kvm__handle_stdin();
 999
1000                 if (!rc && !done)
1001                         err = evlist__poll(kvm->evlist, 100);
1002         }
1003
1004         evlist__disable(kvm->evlist);
1005
1006         if (err == 0) {
1007                 sort_result(kvm);
1008                 print_result(kvm);
1009         }
1010
1011 out:
1012         if (kvm->timerfd >= 0)
1013                 close(kvm->timerfd);
1014
1015         tcsetattr(0, TCSAFLUSH, &save);
1016         return err;
1017 }
1018
1019 static int kvm_live_open_events(struct perf_kvm_stat *kvm)
1020 {
1021         int err, rc = -1;
1022         struct evsel *pos;
1023         struct evlist *evlist = kvm->evlist;
1024         char sbuf[STRERR_BUFSIZE];
1025
1026         evlist__config(evlist, &kvm->opts, NULL);
1027
1028         /*
1029          * Note: exclude_{guest,host} do not apply here.
1030          *       This command processes KVM tracepoints from host only
1031          */
1032         evlist__for_each_entry(evlist, pos) {
1033                 struct perf_event_attr *attr = &pos->core.attr;
1034
1035                 /* make sure these *are* set */
1036                 evsel__set_sample_bit(pos, TID);
1037                 evsel__set_sample_bit(pos, TIME);
1038                 evsel__set_sample_bit(pos, CPU);
1039                 evsel__set_sample_bit(pos, RAW);
1040                 /* make sure these are *not*; want as small a sample as possible */
1041                 evsel__reset_sample_bit(pos, PERIOD);
1042                 evsel__reset_sample_bit(pos, IP);
1043                 evsel__reset_sample_bit(pos, CALLCHAIN);
1044                 evsel__reset_sample_bit(pos, ADDR);
1045                 evsel__reset_sample_bit(pos, READ);
1046                 attr->mmap = 0;
1047                 attr->comm = 0;
1048                 attr->task = 0;
1049
1050                 attr->sample_period = 1;
1051
1052                 attr->watermark = 0;
1053                 attr->wakeup_events = 1000;
1054
1055                 /* will enable all once we are ready */
1056                 attr->disabled = 1;
1057         }
1058
1059         err = evlist__open(evlist);
1060         if (err < 0) {
1061                 printf("Couldn't create the events: %s\n",
1062                        str_error_r(errno, sbuf, sizeof(sbuf)));
1063                 goto out;
1064         }
1065
1066         if (evlist__mmap(evlist, kvm->opts.mmap_pages) < 0) {
1067                 ui__error("Failed to mmap the events: %s\n",
1068                           str_error_r(errno, sbuf, sizeof(sbuf)));
1069                 evlist__close(evlist);
1070                 goto out;
1071         }
1072
1073         rc = 0;
1074
1075 out:
1076         return rc;
1077 }
1078 #endif
1079
1080 static int read_events(struct perf_kvm_stat *kvm)
1081 {
1082         int ret;
1083
1084         struct perf_tool eops = {
1085                 .sample                 = process_sample_event,
1086                 .comm                   = perf_event__process_comm,
1087                 .namespaces             = perf_event__process_namespaces,
1088                 .ordered_events         = true,
1089         };
1090         struct perf_data file = {
1091                 .path  = kvm->file_name,
1092                 .mode  = PERF_DATA_MODE_READ,
1093                 .force = kvm->force,
1094         };
1095
1096         kvm->tool = eops;
1097         kvm->session = perf_session__new(&file, &kvm->tool);
1098         if (IS_ERR(kvm->session)) {
1099                 pr_err("Initializing perf session failed\n");
1100                 return PTR_ERR(kvm->session);
1101         }
1102
1103         symbol__init(&kvm->session->header.env);
1104
1105         if (!perf_session__has_traces(kvm->session, "kvm record")) {
1106                 ret = -EINVAL;
1107                 goto out_delete;
1108         }
1109
1110         /*
1111          * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
1112          * traced in the old kernel.
1113          */
1114         ret = cpu_isa_config(kvm);
1115         if (ret < 0)
1116                 goto out_delete;
1117
1118         ret = perf_session__process_events(kvm->session);
1119
1120 out_delete:
1121         perf_session__delete(kvm->session);
1122         return ret;
1123 }
1124
1125 static int parse_target_str(struct perf_kvm_stat *kvm)
1126 {
1127         if (kvm->opts.target.pid) {
1128                 kvm->pid_list = intlist__new(kvm->opts.target.pid);
1129                 if (kvm->pid_list == NULL) {
1130                         pr_err("Error parsing process id string\n");
1131                         return -EINVAL;
1132                 }
1133         }
1134
1135         return 0;
1136 }
1137
1138 static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
1139 {
1140         int ret = -EINVAL;
1141         int vcpu = kvm->trace_vcpu;
1142
1143         if (parse_target_str(kvm) != 0)
1144                 goto exit;
1145
1146         if (!verify_vcpu(vcpu))
1147                 goto exit;
1148
1149         if (!select_key(kvm))
1150                 goto exit;
1151
1152         if (!register_kvm_events_ops(kvm))
1153                 goto exit;
1154
1155         init_kvm_event_record(kvm);
1156         setup_pager();
1157
1158         ret = read_events(kvm);
1159         if (ret)
1160                 goto exit;
1161
1162         sort_result(kvm);
1163         print_result(kvm);
1164
1165 exit:
1166         return ret;
1167 }
1168
1169 #define STRDUP_FAIL_EXIT(s)             \
1170         ({      char *_p;               \
1171         _p = strdup(s);         \
1172                 if (!_p)                \
1173                         return -ENOMEM; \
1174                 _p;                     \
1175         })
1176
1177 int __weak setup_kvm_events_tp(struct perf_kvm_stat *kvm __maybe_unused)
1178 {
1179         return 0;
1180 }
1181
1182 static int
1183 kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
1184 {
1185         unsigned int rec_argc, i, j, events_tp_size;
1186         const char **rec_argv;
1187         const char * const record_args[] = {
1188                 "record",
1189                 "-R",
1190                 "-m", "1024",
1191                 "-c", "1",
1192         };
1193         const char * const kvm_stat_record_usage[] = {
1194                 "perf kvm stat record [<options>]",
1195                 NULL
1196         };
1197         const char * const *events_tp;
1198         int ret;
1199
1200         events_tp_size = 0;
1201         ret = setup_kvm_events_tp(kvm);
1202         if (ret < 0) {
1203                 pr_err("Unable to setup the kvm tracepoints\n");
1204                 return ret;
1205         }
1206
1207         for (events_tp = kvm_events_tp; *events_tp; events_tp++)
1208                 events_tp_size++;
1209
1210         rec_argc = ARRAY_SIZE(record_args) + argc + 2 +
1211                    2 * events_tp_size;
1212         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1213
1214         if (rec_argv == NULL)
1215                 return -ENOMEM;
1216
1217         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1218                 rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);
1219
1220         for (j = 0; j < events_tp_size; j++) {
1221                 rec_argv[i++] = "-e";
1222                 rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]);
1223         }
1224
1225         rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
1226         rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);
1227
1228         for (j = 1; j < (unsigned int)argc; j++, i++)
1229                 rec_argv[i] = argv[j];
1230
1231         set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
1232         set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
1233         set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);
1234
1235         set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
1236         set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
1237         set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
1238         set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
1239         set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
1240         set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
1241         set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
1242         set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
1243         set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
1244         set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
1245         set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
1246         set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
1247         set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
1248         set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
1249         set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
1250
1251         record_usage = kvm_stat_record_usage;
1252         return cmd_record(i, rec_argv);
1253 }
1254
1255 static int
1256 kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
1257 {
1258         const struct option kvm_events_report_options[] = {
1259                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1260                            "event for reporting: vmexit, "
1261                            "mmio (x86 only), ioport (x86 only)"),
1262                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1263                             "vcpu id to report"),
1264                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1265                             "key for sorting: sample(sort by samples number)"
1266                             " time (sort by avg time)"),
1267                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1268                            "analyze events only for given process id(s)"),
1269                 OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"),
1270                 OPT_END()
1271         };
1272
1273         const char * const kvm_events_report_usage[] = {
1274                 "perf kvm stat report [<options>]",
1275                 NULL
1276         };
1277
1278         if (argc) {
1279                 argc = parse_options(argc, argv,
1280                                      kvm_events_report_options,
1281                                      kvm_events_report_usage, 0);
1282                 if (argc)
1283                         usage_with_options(kvm_events_report_usage,
1284                                            kvm_events_report_options);
1285         }
1286
1287         if (!kvm->opts.target.pid)
1288                 kvm->opts.target.system_wide = true;
1289
1290         return kvm_events_report_vcpu(kvm);
1291 }
1292
1293 #ifdef HAVE_TIMERFD_SUPPORT
1294 static struct evlist *kvm_live_event_list(void)
1295 {
1296         struct evlist *evlist;
1297         char *tp, *name, *sys;
1298         int err = -1;
1299         const char * const *events_tp;
1300
1301         evlist = evlist__new();
1302         if (evlist == NULL)
1303                 return NULL;
1304
1305         for (events_tp = kvm_events_tp; *events_tp; events_tp++) {
1306
1307                 tp = strdup(*events_tp);
1308                 if (tp == NULL)
1309                         goto out;
1310
1311                 /* split tracepoint into subsystem and name */
1312                 sys = tp;
1313                 name = strchr(tp, ':');
1314                 if (name == NULL) {
1315                         pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n",
1316                                *events_tp);
1317                         free(tp);
1318                         goto out;
1319                 }
1320                 *name = '\0';
1321                 name++;
1322
1323                 if (evlist__add_newtp(evlist, sys, name, NULL)) {
1324                         pr_err("Failed to add %s tracepoint to the list\n", *events_tp);
1325                         free(tp);
1326                         goto out;
1327                 }
1328
1329                 free(tp);
1330         }
1331
1332         err = 0;
1333
1334 out:
1335         if (err) {
1336                 evlist__delete(evlist);
1337                 evlist = NULL;
1338         }
1339
1340         return evlist;
1341 }
1342
1343 static int kvm_events_live(struct perf_kvm_stat *kvm,
1344                            int argc, const char **argv)
1345 {
1346         char errbuf[BUFSIZ];
1347         int err;
1348
1349         const struct option live_options[] = {
1350                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1351                         "record events on existing process id"),
1352                 OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
1353                         "number of mmap data pages", evlist__parse_mmap_pages),
1354                 OPT_INCR('v', "verbose", &verbose,
1355                         "be more verbose (show counter open errors, etc)"),
1356                 OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
1357                         "system-wide collection from all CPUs"),
1358                 OPT_UINTEGER('d', "display", &kvm->display_time,
1359                         "time in seconds between display updates"),
1360                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1361                         "event for reporting: "
1362                         "vmexit, mmio (x86 only), ioport (x86 only)"),
1363                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1364                         "vcpu id to report"),
1365                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1366                         "key for sorting: sample(sort by samples number)"
1367                         " time (sort by avg time)"),
1368                 OPT_U64(0, "duration", &kvm->duration,
1369                         "show events other than"
1370                         " HLT (x86 only) or Wait state (s390 only)"
1371                         " that take longer than duration usecs"),
1372                 OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
1373                                 "per thread proc mmap processing timeout in ms"),
1374                 OPT_END()
1375         };
1376         const char * const live_usage[] = {
1377                 "perf kvm stat live [<options>]",
1378                 NULL
1379         };
1380         struct perf_data data = {
1381                 .mode = PERF_DATA_MODE_WRITE,
1382         };
1383
1384
1385         /* event handling */
1386         kvm->tool.sample = process_sample_event;
1387         kvm->tool.comm   = perf_event__process_comm;
1388         kvm->tool.exit   = perf_event__process_exit;
1389         kvm->tool.fork   = perf_event__process_fork;
1390         kvm->tool.lost   = process_lost_event;
1391         kvm->tool.namespaces  = perf_event__process_namespaces;
1392         kvm->tool.ordered_events = true;
1393         perf_tool__fill_defaults(&kvm->tool);
1394
1395         /* set defaults */
1396         kvm->display_time = 1;
1397         kvm->opts.user_interval = 1;
1398         kvm->opts.mmap_pages = 512;
1399         kvm->opts.target.uses_mmap = false;
1400         kvm->opts.target.uid_str = NULL;
1401         kvm->opts.target.uid = UINT_MAX;
1402
1403         symbol__init(NULL);
1404         disable_buildid_cache();
1405
1406         use_browser = 0;
1407
1408         if (argc) {
1409                 argc = parse_options(argc, argv, live_options,
1410                                      live_usage, 0);
1411                 if (argc)
1412                         usage_with_options(live_usage, live_options);
1413         }
1414
1415         kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */
1416
1417         /*
1418          * target related setups
1419          */
1420         err = target__validate(&kvm->opts.target);
1421         if (err) {
1422                 target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ);
1423                 ui__warning("%s", errbuf);
1424         }
1425
1426         if (target__none(&kvm->opts.target))
1427                 kvm->opts.target.system_wide = true;
1428
1429
1430         /*
1431          * generate the event list
1432          */
1433         err = setup_kvm_events_tp(kvm);
1434         if (err < 0) {
1435                 pr_err("Unable to setup the kvm tracepoints\n");
1436                 return err;
1437         }
1438
1439         kvm->evlist = kvm_live_event_list();
1440         if (kvm->evlist == NULL) {
1441                 err = -1;
1442                 goto out;
1443         }
1444
1445         if (evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0)
1446                 usage_with_options(live_usage, live_options);
1447
1448         /*
1449          * perf session
1450          */
1451         kvm->session = perf_session__new(&data, &kvm->tool);
1452         if (IS_ERR(kvm->session)) {
1453                 err = PTR_ERR(kvm->session);
1454                 goto out;
1455         }
1456         kvm->session->evlist = kvm->evlist;
1457         perf_session__set_id_hdr_size(kvm->session);
1458         ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
1459         machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
1460                                     kvm->evlist->core.threads, true, false, 1);
1461         err = kvm_live_open_events(kvm);
1462         if (err)
1463                 goto out;
1464
1465         err = kvm_events_live_report(kvm);
1466
1467 out:
1468         perf_session__delete(kvm->session);
1469         kvm->session = NULL;
1470         evlist__delete(kvm->evlist);
1471
1472         return err;
1473 }
1474 #endif
1475
1476 static void print_kvm_stat_usage(void)
1477 {
1478         printf("Usage: perf kvm stat <command>\n\n");
1479
1480         printf("# Available commands:\n");
1481         printf("\trecord: record kvm events\n");
1482         printf("\treport: report statistical data of kvm events\n");
1483         printf("\tlive:   live reporting of statistical data of kvm events\n");
1484
1485         printf("\nOtherwise, it is the alias of 'perf stat':\n");
1486 }
1487
1488 static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
1489 {
1490         struct perf_kvm_stat kvm = {
1491                 .file_name = file_name,
1492
1493                 .trace_vcpu     = -1,
1494                 .report_event   = "vmexit",
1495                 .sort_key       = "sample",
1496
1497         };
1498
1499         if (argc == 1) {
1500                 print_kvm_stat_usage();
1501                 goto perf_stat;
1502         }
1503
1504         if (strlen(argv[1]) > 2 && strstarts("record", argv[1]))
1505                 return kvm_events_record(&kvm, argc - 1, argv + 1);
1506
1507         if (strlen(argv[1]) > 2 && strstarts("report", argv[1]))
1508                 return kvm_events_report(&kvm, argc - 1 , argv + 1);
1509
1510 #ifdef HAVE_TIMERFD_SUPPORT
1511         if (!strncmp(argv[1], "live", 4))
1512                 return kvm_events_live(&kvm, argc - 1 , argv + 1);
1513 #endif
1514
1515 perf_stat:
1516         return cmd_stat(argc, argv);
1517 }
1518 #endif /* HAVE_KVM_STAT_SUPPORT */
1519
1520 int __weak kvm_add_default_arch_event(int *argc __maybe_unused,
1521                                         const char **argv __maybe_unused)
1522 {
1523         return 0;
1524 }
1525
1526 static int __cmd_record(const char *file_name, int argc, const char **argv)
1527 {
1528         int rec_argc, i = 0, j, ret;
1529         const char **rec_argv;
1530
1531         ret = kvm_add_default_arch_event(&argc, argv);
1532         if (ret)
1533                 return -EINVAL;
1534
1535         rec_argc = argc + 2;
1536         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1537         rec_argv[i++] = strdup("record");
1538         rec_argv[i++] = strdup("-o");
1539         rec_argv[i++] = strdup(file_name);
1540         for (j = 1; j < argc; j++, i++)
1541                 rec_argv[i] = argv[j];
1542
1543         BUG_ON(i != rec_argc);
1544
1545         return cmd_record(i, rec_argv);
1546 }
1547
1548 static int __cmd_report(const char *file_name, int argc, const char **argv)
1549 {
1550         int rec_argc, i = 0, j;
1551         const char **rec_argv;
1552
1553         rec_argc = argc + 2;
1554         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1555         rec_argv[i++] = strdup("report");
1556         rec_argv[i++] = strdup("-i");
1557         rec_argv[i++] = strdup(file_name);
1558         for (j = 1; j < argc; j++, i++)
1559                 rec_argv[i] = argv[j];
1560
1561         BUG_ON(i != rec_argc);
1562
1563         return cmd_report(i, rec_argv);
1564 }
1565
1566 static int
1567 __cmd_buildid_list(const char *file_name, int argc, const char **argv)
1568 {
1569         int rec_argc, i = 0, j;
1570         const char **rec_argv;
1571
1572         rec_argc = argc + 2;
1573         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1574         rec_argv[i++] = strdup("buildid-list");
1575         rec_argv[i++] = strdup("-i");
1576         rec_argv[i++] = strdup(file_name);
1577         for (j = 1; j < argc; j++, i++)
1578                 rec_argv[i] = argv[j];
1579
1580         BUG_ON(i != rec_argc);
1581
1582         return cmd_buildid_list(i, rec_argv);
1583 }
1584
1585 int cmd_kvm(int argc, const char **argv)
1586 {
1587         const char *file_name = NULL;
1588         const struct option kvm_options[] = {
1589                 OPT_STRING('i', "input", &file_name, "file",
1590                            "Input file name"),
1591                 OPT_STRING('o', "output", &file_name, "file",
1592                            "Output file name"),
1593                 OPT_BOOLEAN(0, "guest", &perf_guest,
1594                             "Collect guest os data"),
1595                 OPT_BOOLEAN(0, "host", &perf_host,
1596                             "Collect host os data"),
1597                 OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
1598                            "guest mount directory under which every guest os"
1599                            " instance has a subdir"),
1600                 OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
1601                            "file", "file saving guest os vmlinux"),
1602                 OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
1603                            "file", "file saving guest os /proc/kallsyms"),
1604                 OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
1605                            "file", "file saving guest os /proc/modules"),
1606                 OPT_INCR('v', "verbose", &verbose,
1607                             "be more verbose (show counter open errors, etc)"),
1608                 OPT_END()
1609         };
1610
1611         const char *const kvm_subcommands[] = { "top", "record", "report", "diff",
1612                                                 "buildid-list", "stat", NULL };
1613         const char *kvm_usage[] = { NULL, NULL };
1614
1615         perf_host  = 0;
1616         perf_guest = 1;
1617
1618         argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, kvm_usage,
1619                                         PARSE_OPT_STOP_AT_NON_OPTION);
1620         if (!argc)
1621                 usage_with_options(kvm_usage, kvm_options);
1622
1623         if (!perf_host)
1624                 perf_guest = 1;
1625
1626         if (!file_name) {
1627                 file_name = get_filename_for_perf_kvm();
1628
1629                 if (!file_name) {
1630                         pr_err("Failed to allocate memory for filename\n");
1631                         return -ENOMEM;
1632                 }
1633         }
1634
1635         if (strlen(argv[0]) > 2 && strstarts("record", argv[0]))
1636                 return __cmd_record(file_name, argc, argv);
1637         else if (strlen(argv[0]) > 2 && strstarts("report", argv[0]))
1638                 return __cmd_report(file_name, argc, argv);
1639         else if (!strncmp(argv[0], "diff", 4))
1640                 return cmd_diff(argc, argv);
1641         else if (!strncmp(argv[0], "top", 3))
1642                 return cmd_top(argc, argv);
1643         else if (!strncmp(argv[0], "buildid-list", 12))
1644                 return __cmd_buildid_list(file_name, argc, argv);
1645 #ifdef HAVE_KVM_STAT_SUPPORT
1646         else if (!strncmp(argv[0], "stat", 4))
1647                 return kvm_cmd_stat(file_name, argc, argv);
1648 #endif
1649         else
1650                 usage_with_options(kvm_usage, kvm_options);
1651
1652         return 0;
1653 }