linux/tools/perf/builtin-kvm.c
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   1#include "builtin.h"
   2#include "perf.h"
   3
   4#include "util/evsel.h"
   5#include "util/util.h"
   6#include "util/cache.h"
   7#include "util/symbol.h"
   8#include "util/thread.h"
   9#include "util/header.h"
  10#include "util/session.h"
  11
  12#include "util/parse-options.h"
  13#include "util/trace-event.h"
  14#include "util/debug.h"
  15#include <lk/debugfs.h>
  16#include "util/tool.h"
  17#include "util/stat.h"
  18
  19#include <sys/prctl.h>
  20
  21#include <semaphore.h>
  22#include <pthread.h>
  23#include <math.h>
  24
  25#if defined(__i386__) || defined(__x86_64__)
  26#include <asm/svm.h>
  27#include <asm/vmx.h>
  28#include <asm/kvm.h>
  29
  30struct event_key {
  31        #define INVALID_KEY     (~0ULL)
  32        u64 key;
  33        int info;
  34};
  35
  36struct kvm_event_stats {
  37        u64 time;
  38        struct stats stats;
  39};
  40
  41struct kvm_event {
  42        struct list_head hash_entry;
  43        struct rb_node rb;
  44
  45        struct event_key key;
  46
  47        struct kvm_event_stats total;
  48
  49        #define DEFAULT_VCPU_NUM 8
  50        int max_vcpu;
  51        struct kvm_event_stats *vcpu;
  52};
  53
  54typedef int (*key_cmp_fun)(struct kvm_event*, struct kvm_event*, int);
  55
  56struct kvm_event_key {
  57        const char *name;
  58        key_cmp_fun key;
  59};
  60
  61
  62struct perf_kvm_stat;
  63
  64struct kvm_events_ops {
  65        bool (*is_begin_event)(struct perf_evsel *evsel,
  66                               struct perf_sample *sample,
  67                               struct event_key *key);
  68        bool (*is_end_event)(struct perf_evsel *evsel,
  69                             struct perf_sample *sample, struct event_key *key);
  70        void (*decode_key)(struct perf_kvm_stat *kvm, struct event_key *key,
  71                           char decode[20]);
  72        const char *name;
  73};
  74
  75struct exit_reasons_table {
  76        unsigned long exit_code;
  77        const char *reason;
  78};
  79
  80#define EVENTS_BITS             12
  81#define EVENTS_CACHE_SIZE       (1UL << EVENTS_BITS)
  82
  83struct perf_kvm_stat {
  84        struct perf_tool    tool;
  85        struct perf_session *session;
  86
  87        const char *file_name;
  88        const char *report_event;
  89        const char *sort_key;
  90        int trace_vcpu;
  91
  92        struct exit_reasons_table *exit_reasons;
  93        int exit_reasons_size;
  94        const char *exit_reasons_isa;
  95
  96        struct kvm_events_ops *events_ops;
  97        key_cmp_fun compare;
  98        struct list_head kvm_events_cache[EVENTS_CACHE_SIZE];
  99        u64 total_time;
 100        u64 total_count;
 101
 102        struct rb_root result;
 103};
 104
 105
 106static void exit_event_get_key(struct perf_evsel *evsel,
 107                               struct perf_sample *sample,
 108                               struct event_key *key)
 109{
 110        key->info = 0;
 111        key->key = perf_evsel__intval(evsel, sample, "exit_reason");
 112}
 113
 114static bool kvm_exit_event(struct perf_evsel *evsel)
 115{
 116        return !strcmp(evsel->name, "kvm:kvm_exit");
 117}
 118
 119static bool exit_event_begin(struct perf_evsel *evsel,
 120                             struct perf_sample *sample, struct event_key *key)
 121{
 122        if (kvm_exit_event(evsel)) {
 123                exit_event_get_key(evsel, sample, key);
 124                return true;
 125        }
 126
 127        return false;
 128}
 129
 130static bool kvm_entry_event(struct perf_evsel *evsel)
 131{
 132        return !strcmp(evsel->name, "kvm:kvm_entry");
 133}
 134
 135static bool exit_event_end(struct perf_evsel *evsel,
 136                           struct perf_sample *sample __maybe_unused,
 137                           struct event_key *key __maybe_unused)
 138{
 139        return kvm_entry_event(evsel);
 140}
 141
 142static struct exit_reasons_table vmx_exit_reasons[] = {
 143        VMX_EXIT_REASONS
 144};
 145
 146static struct exit_reasons_table svm_exit_reasons[] = {
 147        SVM_EXIT_REASONS
 148};
 149
 150static const char *get_exit_reason(struct perf_kvm_stat *kvm, u64 exit_code)
 151{
 152        int i = kvm->exit_reasons_size;
 153        struct exit_reasons_table *tbl = kvm->exit_reasons;
 154
 155        while (i--) {
 156                if (tbl->exit_code == exit_code)
 157                        return tbl->reason;
 158                tbl++;
 159        }
 160
 161        pr_err("unknown kvm exit code:%lld on %s\n",
 162                (unsigned long long)exit_code, kvm->exit_reasons_isa);
 163        return "UNKNOWN";
 164}
 165
 166static void exit_event_decode_key(struct perf_kvm_stat *kvm,
 167                                  struct event_key *key,
 168                                  char decode[20])
 169{
 170        const char *exit_reason = get_exit_reason(kvm, key->key);
 171
 172        scnprintf(decode, 20, "%s", exit_reason);
 173}
 174
 175static struct kvm_events_ops exit_events = {
 176        .is_begin_event = exit_event_begin,
 177        .is_end_event = exit_event_end,
 178        .decode_key = exit_event_decode_key,
 179        .name = "VM-EXIT"
 180};
 181
 182/*
 183 * For the mmio events, we treat:
 184 * the time of MMIO write: kvm_mmio(KVM_TRACE_MMIO_WRITE...) -> kvm_entry
 185 * the time of MMIO read: kvm_exit -> kvm_mmio(KVM_TRACE_MMIO_READ...).
 186 */
 187static void mmio_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample,
 188                               struct event_key *key)
 189{
 190        key->key  = perf_evsel__intval(evsel, sample, "gpa");
 191        key->info = perf_evsel__intval(evsel, sample, "type");
 192}
 193
 194#define KVM_TRACE_MMIO_READ_UNSATISFIED 0
 195#define KVM_TRACE_MMIO_READ 1
 196#define KVM_TRACE_MMIO_WRITE 2
 197
 198static bool mmio_event_begin(struct perf_evsel *evsel,
 199                             struct perf_sample *sample, struct event_key *key)
 200{
 201        /* MMIO read begin event in kernel. */
 202        if (kvm_exit_event(evsel))
 203                return true;
 204
 205        /* MMIO write begin event in kernel. */
 206        if (!strcmp(evsel->name, "kvm:kvm_mmio") &&
 207            perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_WRITE) {
 208                mmio_event_get_key(evsel, sample, key);
 209                return true;
 210        }
 211
 212        return false;
 213}
 214
 215static bool mmio_event_end(struct perf_evsel *evsel, struct perf_sample *sample,
 216                           struct event_key *key)
 217{
 218        /* MMIO write end event in kernel. */
 219        if (kvm_entry_event(evsel))
 220                return true;
 221
 222        /* MMIO read end event in kernel.*/
 223        if (!strcmp(evsel->name, "kvm:kvm_mmio") &&
 224            perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_READ) {
 225                mmio_event_get_key(evsel, sample, key);
 226                return true;
 227        }
 228
 229        return false;
 230}
 231
 232static void mmio_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
 233                                  struct event_key *key,
 234                                  char decode[20])
 235{
 236        scnprintf(decode, 20, "%#lx:%s", (unsigned long)key->key,
 237                                key->info == KVM_TRACE_MMIO_WRITE ? "W" : "R");
 238}
 239
 240static struct kvm_events_ops mmio_events = {
 241        .is_begin_event = mmio_event_begin,
 242        .is_end_event = mmio_event_end,
 243        .decode_key = mmio_event_decode_key,
 244        .name = "MMIO Access"
 245};
 246
 247 /* The time of emulation pio access is from kvm_pio to kvm_entry. */
 248static void ioport_event_get_key(struct perf_evsel *evsel,
 249                                 struct perf_sample *sample,
 250                                 struct event_key *key)
 251{
 252        key->key  = perf_evsel__intval(evsel, sample, "port");
 253        key->info = perf_evsel__intval(evsel, sample, "rw");
 254}
 255
 256static bool ioport_event_begin(struct perf_evsel *evsel,
 257                               struct perf_sample *sample,
 258                               struct event_key *key)
 259{
 260        if (!strcmp(evsel->name, "kvm:kvm_pio")) {
 261                ioport_event_get_key(evsel, sample, key);
 262                return true;
 263        }
 264
 265        return false;
 266}
 267
 268static bool ioport_event_end(struct perf_evsel *evsel,
 269                             struct perf_sample *sample __maybe_unused,
 270                             struct event_key *key __maybe_unused)
 271{
 272        return kvm_entry_event(evsel);
 273}
 274
 275static void ioport_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
 276                                    struct event_key *key,
 277                                    char decode[20])
 278{
 279        scnprintf(decode, 20, "%#llx:%s", (unsigned long long)key->key,
 280                                key->info ? "POUT" : "PIN");
 281}
 282
 283static struct kvm_events_ops ioport_events = {
 284        .is_begin_event = ioport_event_begin,
 285        .is_end_event = ioport_event_end,
 286        .decode_key = ioport_event_decode_key,
 287        .name = "IO Port Access"
 288};
 289
 290static bool register_kvm_events_ops(struct perf_kvm_stat *kvm)
 291{
 292        bool ret = true;
 293
 294        if (!strcmp(kvm->report_event, "vmexit"))
 295                kvm->events_ops = &exit_events;
 296        else if (!strcmp(kvm->report_event, "mmio"))
 297                kvm->events_ops = &mmio_events;
 298        else if (!strcmp(kvm->report_event, "ioport"))
 299                kvm->events_ops = &ioport_events;
 300        else {
 301                pr_err("Unknown report event:%s\n", kvm->report_event);
 302                ret = false;
 303        }
 304
 305        return ret;
 306}
 307
 308struct vcpu_event_record {
 309        int vcpu_id;
 310        u64 start_time;
 311        struct kvm_event *last_event;
 312};
 313
 314
 315static void init_kvm_event_record(struct perf_kvm_stat *kvm)
 316{
 317        unsigned int i;
 318
 319        for (i = 0; i < EVENTS_CACHE_SIZE; i++)
 320                INIT_LIST_HEAD(&kvm->kvm_events_cache[i]);
 321}
 322
 323static int kvm_events_hash_fn(u64 key)
 324{
 325        return key & (EVENTS_CACHE_SIZE - 1);
 326}
 327
 328static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
 329{
 330        int old_max_vcpu = event->max_vcpu;
 331        void *prev;
 332
 333        if (vcpu_id < event->max_vcpu)
 334                return true;
 335
 336        while (event->max_vcpu <= vcpu_id)
 337                event->max_vcpu += DEFAULT_VCPU_NUM;
 338
 339        prev = event->vcpu;
 340        event->vcpu = realloc(event->vcpu,
 341                              event->max_vcpu * sizeof(*event->vcpu));
 342        if (!event->vcpu) {
 343                free(prev);
 344                pr_err("Not enough memory\n");
 345                return false;
 346        }
 347
 348        memset(event->vcpu + old_max_vcpu, 0,
 349               (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
 350        return true;
 351}
 352
 353static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
 354{
 355        struct kvm_event *event;
 356
 357        event = zalloc(sizeof(*event));
 358        if (!event) {
 359                pr_err("Not enough memory\n");
 360                return NULL;
 361        }
 362
 363        event->key = *key;
 364        return event;
 365}
 366
 367static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm,
 368                                               struct event_key *key)
 369{
 370        struct kvm_event *event;
 371        struct list_head *head;
 372
 373        BUG_ON(key->key == INVALID_KEY);
 374
 375        head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)];
 376        list_for_each_entry(event, head, hash_entry) {
 377                if (event->key.key == key->key && event->key.info == key->info)
 378                        return event;
 379        }
 380
 381        event = kvm_alloc_init_event(key);
 382        if (!event)
 383                return NULL;
 384
 385        list_add(&event->hash_entry, head);
 386        return event;
 387}
 388
 389static bool handle_begin_event(struct perf_kvm_stat *kvm,
 390                               struct vcpu_event_record *vcpu_record,
 391                               struct event_key *key, u64 timestamp)
 392{
 393        struct kvm_event *event = NULL;
 394
 395        if (key->key != INVALID_KEY)
 396                event = find_create_kvm_event(kvm, key);
 397
 398        vcpu_record->last_event = event;
 399        vcpu_record->start_time = timestamp;
 400        return true;
 401}
 402
 403static void
 404kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff)
 405{
 406        kvm_stats->time += time_diff;
 407        update_stats(&kvm_stats->stats, time_diff);
 408}
 409
 410static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
 411{
 412        struct kvm_event_stats *kvm_stats = &event->total;
 413
 414        if (vcpu_id != -1)
 415                kvm_stats = &event->vcpu[vcpu_id];
 416
 417        return rel_stddev_stats(stddev_stats(&kvm_stats->stats),
 418                                avg_stats(&kvm_stats->stats));
 419}
 420
 421static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
 422                             u64 time_diff)
 423{
 424        if (vcpu_id == -1) {
 425                kvm_update_event_stats(&event->total, time_diff);
 426                return true;
 427        }
 428
 429        if (!kvm_event_expand(event, vcpu_id))
 430                return false;
 431
 432        kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
 433        return true;
 434}
 435
 436static bool handle_end_event(struct perf_kvm_stat *kvm,
 437                             struct vcpu_event_record *vcpu_record,
 438                             struct event_key *key,
 439                             u64 timestamp)
 440{
 441        struct kvm_event *event;
 442        u64 time_begin, time_diff;
 443        int vcpu;
 444
 445        if (kvm->trace_vcpu == -1)
 446                vcpu = -1;
 447        else
 448                vcpu = vcpu_record->vcpu_id;
 449
 450        event = vcpu_record->last_event;
 451        time_begin = vcpu_record->start_time;
 452
 453        /* The begin event is not caught. */
 454        if (!time_begin)
 455                return true;
 456
 457        /*
 458         * In some case, the 'begin event' only records the start timestamp,
 459         * the actual event is recognized in the 'end event' (e.g. mmio-event).
 460         */
 461
 462        /* Both begin and end events did not get the key. */
 463        if (!event && key->key == INVALID_KEY)
 464                return true;
 465
 466        if (!event)
 467                event = find_create_kvm_event(kvm, key);
 468
 469        if (!event)
 470                return false;
 471
 472        vcpu_record->last_event = NULL;
 473        vcpu_record->start_time = 0;
 474
 475        BUG_ON(timestamp < time_begin);
 476
 477        time_diff = timestamp - time_begin;
 478        return update_kvm_event(event, vcpu, time_diff);
 479}
 480
 481static
 482struct vcpu_event_record *per_vcpu_record(struct thread *thread,
 483                                          struct perf_evsel *evsel,
 484                                          struct perf_sample *sample)
 485{
 486        /* Only kvm_entry records vcpu id. */
 487        if (!thread->priv && kvm_entry_event(evsel)) {
 488                struct vcpu_event_record *vcpu_record;
 489
 490                vcpu_record = zalloc(sizeof(*vcpu_record));
 491                if (!vcpu_record) {
 492                        pr_err("%s: Not enough memory\n", __func__);
 493                        return NULL;
 494                }
 495
 496                vcpu_record->vcpu_id = perf_evsel__intval(evsel, sample, "vcpu_id");
 497                thread->priv = vcpu_record;
 498        }
 499
 500        return thread->priv;
 501}
 502
 503static bool handle_kvm_event(struct perf_kvm_stat *kvm,
 504                             struct thread *thread,
 505                             struct perf_evsel *evsel,
 506                             struct perf_sample *sample)
 507{
 508        struct vcpu_event_record *vcpu_record;
 509        struct event_key key = {.key = INVALID_KEY};
 510
 511        vcpu_record = per_vcpu_record(thread, evsel, sample);
 512        if (!vcpu_record)
 513                return true;
 514
 515        /* only process events for vcpus user cares about */
 516        if ((kvm->trace_vcpu != -1) &&
 517            (kvm->trace_vcpu != vcpu_record->vcpu_id))
 518                return true;
 519
 520        if (kvm->events_ops->is_begin_event(evsel, sample, &key))
 521                return handle_begin_event(kvm, vcpu_record, &key, sample->time);
 522
 523        if (kvm->events_ops->is_end_event(evsel, sample, &key))
 524                return handle_end_event(kvm, vcpu_record, &key, sample->time);
 525
 526        return true;
 527}
 528
 529#define GET_EVENT_KEY(func, field)                                      \
 530static u64 get_event_ ##func(struct kvm_event *event, int vcpu)         \
 531{                                                                       \
 532        if (vcpu == -1)                                                 \
 533                return event->total.field;                              \
 534                                                                        \
 535        if (vcpu >= event->max_vcpu)                                    \
 536                return 0;                                               \
 537                                                                        \
 538        return event->vcpu[vcpu].field;                                 \
 539}
 540
 541#define COMPARE_EVENT_KEY(func, field)                                  \
 542GET_EVENT_KEY(func, field)                                              \
 543static int compare_kvm_event_ ## func(struct kvm_event *one,            \
 544                                        struct kvm_event *two, int vcpu)\
 545{                                                                       \
 546        return get_event_ ##func(one, vcpu) >                           \
 547                                get_event_ ##func(two, vcpu);           \
 548}
 549
 550GET_EVENT_KEY(time, time);
 551COMPARE_EVENT_KEY(count, stats.n);
 552COMPARE_EVENT_KEY(mean, stats.mean);
 553
 554#define DEF_SORT_NAME_KEY(name, compare_key)                            \
 555        { #name, compare_kvm_event_ ## compare_key }
 556
 557static struct kvm_event_key keys[] = {
 558        DEF_SORT_NAME_KEY(sample, count),
 559        DEF_SORT_NAME_KEY(time, mean),
 560        { NULL, NULL }
 561};
 562
 563static bool select_key(struct perf_kvm_stat *kvm)
 564{
 565        int i;
 566
 567        for (i = 0; keys[i].name; i++) {
 568                if (!strcmp(keys[i].name, kvm->sort_key)) {
 569                        kvm->compare = keys[i].key;
 570                        return true;
 571                }
 572        }
 573
 574        pr_err("Unknown compare key:%s\n", kvm->sort_key);
 575        return false;
 576}
 577
 578static void insert_to_result(struct rb_root *result, struct kvm_event *event,
 579                             key_cmp_fun bigger, int vcpu)
 580{
 581        struct rb_node **rb = &result->rb_node;
 582        struct rb_node *parent = NULL;
 583        struct kvm_event *p;
 584
 585        while (*rb) {
 586                p = container_of(*rb, struct kvm_event, rb);
 587                parent = *rb;
 588
 589                if (bigger(event, p, vcpu))
 590                        rb = &(*rb)->rb_left;
 591                else
 592                        rb = &(*rb)->rb_right;
 593        }
 594
 595        rb_link_node(&event->rb, parent, rb);
 596        rb_insert_color(&event->rb, result);
 597}
 598
 599static void
 600update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event)
 601{
 602        int vcpu = kvm->trace_vcpu;
 603
 604        kvm->total_count += get_event_count(event, vcpu);
 605        kvm->total_time += get_event_time(event, vcpu);
 606}
 607
 608static bool event_is_valid(struct kvm_event *event, int vcpu)
 609{
 610        return !!get_event_count(event, vcpu);
 611}
 612
 613static void sort_result(struct perf_kvm_stat *kvm)
 614{
 615        unsigned int i;
 616        int vcpu = kvm->trace_vcpu;
 617        struct kvm_event *event;
 618
 619        for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
 620                list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) {
 621                        if (event_is_valid(event, vcpu)) {
 622                                update_total_count(kvm, event);
 623                                insert_to_result(&kvm->result, event,
 624                                                 kvm->compare, vcpu);
 625                        }
 626                }
 627        }
 628}
 629
 630/* returns left most element of result, and erase it */
 631static struct kvm_event *pop_from_result(struct rb_root *result)
 632{
 633        struct rb_node *node = rb_first(result);
 634
 635        if (!node)
 636                return NULL;
 637
 638        rb_erase(node, result);
 639        return container_of(node, struct kvm_event, rb);
 640}
 641
 642static void print_vcpu_info(int vcpu)
 643{
 644        pr_info("Analyze events for ");
 645
 646        if (vcpu == -1)
 647                pr_info("all VCPUs:\n\n");
 648        else
 649                pr_info("VCPU %d:\n\n", vcpu);
 650}
 651
 652static void print_result(struct perf_kvm_stat *kvm)
 653{
 654        char decode[20];
 655        struct kvm_event *event;
 656        int vcpu = kvm->trace_vcpu;
 657
 658        pr_info("\n\n");
 659        print_vcpu_info(vcpu);
 660        pr_info("%20s ", kvm->events_ops->name);
 661        pr_info("%10s ", "Samples");
 662        pr_info("%9s ", "Samples%");
 663
 664        pr_info("%9s ", "Time%");
 665        pr_info("%16s ", "Avg time");
 666        pr_info("\n\n");
 667
 668        while ((event = pop_from_result(&kvm->result))) {
 669                u64 ecount, etime;
 670
 671                ecount = get_event_count(event, vcpu);
 672                etime = get_event_time(event, vcpu);
 673
 674                kvm->events_ops->decode_key(kvm, &event->key, decode);
 675                pr_info("%20s ", decode);
 676                pr_info("%10llu ", (unsigned long long)ecount);
 677                pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
 678                pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
 679                pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount/1e3,
 680                        kvm_event_rel_stddev(vcpu, event));
 681                pr_info("\n");
 682        }
 683
 684        pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n",
 685                kvm->total_count, kvm->total_time / 1e3);
 686}
 687
 688static int process_sample_event(struct perf_tool *tool,
 689                                union perf_event *event,
 690                                struct perf_sample *sample,
 691                                struct perf_evsel *evsel,
 692                                struct machine *machine)
 693{
 694        struct thread *thread = machine__findnew_thread(machine, sample->tid);
 695        struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat,
 696                                                 tool);
 697
 698        if (thread == NULL) {
 699                pr_debug("problem processing %d event, skipping it.\n",
 700                        event->header.type);
 701                return -1;
 702        }
 703
 704        if (!handle_kvm_event(kvm, thread, evsel, sample))
 705                return -1;
 706
 707        return 0;
 708}
 709
 710static int get_cpu_isa(struct perf_session *session)
 711{
 712        char *cpuid = session->header.env.cpuid;
 713        int isa;
 714
 715        if (strstr(cpuid, "Intel"))
 716                isa = 1;
 717        else if (strstr(cpuid, "AMD"))
 718                isa = 0;
 719        else {
 720                pr_err("CPU %s is not supported.\n", cpuid);
 721                isa = -ENOTSUP;
 722        }
 723
 724        return isa;
 725}
 726
 727static int read_events(struct perf_kvm_stat *kvm)
 728{
 729        int ret;
 730
 731        struct perf_tool eops = {
 732                .sample                 = process_sample_event,
 733                .comm                   = perf_event__process_comm,
 734                .ordered_samples        = true,
 735        };
 736
 737        kvm->tool = eops;
 738        kvm->session = perf_session__new(kvm->file_name, O_RDONLY, 0, false,
 739                                         &kvm->tool);
 740        if (!kvm->session) {
 741                pr_err("Initializing perf session failed\n");
 742                return -EINVAL;
 743        }
 744
 745        if (!perf_session__has_traces(kvm->session, "kvm record"))
 746                return -EINVAL;
 747
 748        /*
 749         * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
 750         * traced in the old kernel.
 751         */
 752        ret = get_cpu_isa(kvm->session);
 753
 754        if (ret < 0)
 755                return ret;
 756
 757        if (ret == 1) {
 758                kvm->exit_reasons = vmx_exit_reasons;
 759                kvm->exit_reasons_size = ARRAY_SIZE(vmx_exit_reasons);
 760                kvm->exit_reasons_isa = "VMX";
 761        }
 762
 763        return perf_session__process_events(kvm->session, &kvm->tool);
 764}
 765
 766static bool verify_vcpu(int vcpu)
 767{
 768        if (vcpu != -1 && vcpu < 0) {
 769                pr_err("Invalid vcpu:%d.\n", vcpu);
 770                return false;
 771        }
 772
 773        return true;
 774}
 775
 776static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
 777{
 778        int ret = -EINVAL;
 779        int vcpu = kvm->trace_vcpu;
 780
 781        if (!verify_vcpu(vcpu))
 782                goto exit;
 783
 784        if (!select_key(kvm))
 785                goto exit;
 786
 787        if (!register_kvm_events_ops(kvm))
 788                goto exit;
 789
 790        init_kvm_event_record(kvm);
 791        setup_pager();
 792
 793        ret = read_events(kvm);
 794        if (ret)
 795                goto exit;
 796
 797        sort_result(kvm);
 798        print_result(kvm);
 799
 800exit:
 801        return ret;
 802}
 803
 804static const char * const record_args[] = {
 805        "record",
 806        "-R",
 807        "-f",
 808        "-m", "1024",
 809        "-c", "1",
 810        "-e", "kvm:kvm_entry",
 811        "-e", "kvm:kvm_exit",
 812        "-e", "kvm:kvm_mmio",
 813        "-e", "kvm:kvm_pio",
 814};
 815
 816#define STRDUP_FAIL_EXIT(s)             \
 817        ({      char *_p;               \
 818        _p = strdup(s);         \
 819                if (!_p)                \
 820                        return -ENOMEM; \
 821                _p;                     \
 822        })
 823
 824static int
 825kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
 826{
 827        unsigned int rec_argc, i, j;
 828        const char **rec_argv;
 829
 830        rec_argc = ARRAY_SIZE(record_args) + argc + 2;
 831        rec_argv = calloc(rec_argc + 1, sizeof(char *));
 832
 833        if (rec_argv == NULL)
 834                return -ENOMEM;
 835
 836        for (i = 0; i < ARRAY_SIZE(record_args); i++)
 837                rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);
 838
 839        rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
 840        rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);
 841
 842        for (j = 1; j < (unsigned int)argc; j++, i++)
 843                rec_argv[i] = argv[j];
 844
 845        return cmd_record(i, rec_argv, NULL);
 846}
 847
 848static int
 849kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
 850{
 851        const struct option kvm_events_report_options[] = {
 852                OPT_STRING(0, "event", &kvm->report_event, "report event",
 853                            "event for reporting: vmexit, mmio, ioport"),
 854                OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
 855                            "vcpu id to report"),
 856                OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
 857                            "key for sorting: sample(sort by samples number)"
 858                            " time (sort by avg time)"),
 859                OPT_END()
 860        };
 861
 862        const char * const kvm_events_report_usage[] = {
 863                "perf kvm stat report [<options>]",
 864                NULL
 865        };
 866
 867        symbol__init();
 868
 869        if (argc) {
 870                argc = parse_options(argc, argv,
 871                                     kvm_events_report_options,
 872                                     kvm_events_report_usage, 0);
 873                if (argc)
 874                        usage_with_options(kvm_events_report_usage,
 875                                           kvm_events_report_options);
 876        }
 877
 878        return kvm_events_report_vcpu(kvm);
 879}
 880
 881static void print_kvm_stat_usage(void)
 882{
 883        printf("Usage: perf kvm stat <command>\n\n");
 884
 885        printf("# Available commands:\n");
 886        printf("\trecord: record kvm events\n");
 887        printf("\treport: report statistical data of kvm events\n");
 888
 889        printf("\nOtherwise, it is the alias of 'perf stat':\n");
 890}
 891
 892static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
 893{
 894        struct perf_kvm_stat kvm = {
 895                .file_name = file_name,
 896
 897                .trace_vcpu     = -1,
 898                .report_event   = "vmexit",
 899                .sort_key       = "sample",
 900
 901                .exit_reasons = svm_exit_reasons,
 902                .exit_reasons_size = ARRAY_SIZE(svm_exit_reasons),
 903                .exit_reasons_isa = "SVM",
 904        };
 905
 906        if (argc == 1) {
 907                print_kvm_stat_usage();
 908                goto perf_stat;
 909        }
 910
 911        if (!strncmp(argv[1], "rec", 3))
 912                return kvm_events_record(&kvm, argc - 1, argv + 1);
 913
 914        if (!strncmp(argv[1], "rep", 3))
 915                return kvm_events_report(&kvm, argc - 1 , argv + 1);
 916
 917perf_stat:
 918        return cmd_stat(argc, argv, NULL);
 919}
 920#endif
 921
 922static int __cmd_record(const char *file_name, int argc, const char **argv)
 923{
 924        int rec_argc, i = 0, j;
 925        const char **rec_argv;
 926
 927        rec_argc = argc + 2;
 928        rec_argv = calloc(rec_argc + 1, sizeof(char *));
 929        rec_argv[i++] = strdup("record");
 930        rec_argv[i++] = strdup("-o");
 931        rec_argv[i++] = strdup(file_name);
 932        for (j = 1; j < argc; j++, i++)
 933                rec_argv[i] = argv[j];
 934
 935        BUG_ON(i != rec_argc);
 936
 937        return cmd_record(i, rec_argv, NULL);
 938}
 939
 940static int __cmd_report(const char *file_name, int argc, const char **argv)
 941{
 942        int rec_argc, i = 0, j;
 943        const char **rec_argv;
 944
 945        rec_argc = argc + 2;
 946        rec_argv = calloc(rec_argc + 1, sizeof(char *));
 947        rec_argv[i++] = strdup("report");
 948        rec_argv[i++] = strdup("-i");
 949        rec_argv[i++] = strdup(file_name);
 950        for (j = 1; j < argc; j++, i++)
 951                rec_argv[i] = argv[j];
 952
 953        BUG_ON(i != rec_argc);
 954
 955        return cmd_report(i, rec_argv, NULL);
 956}
 957
 958static int
 959__cmd_buildid_list(const char *file_name, int argc, const char **argv)
 960{
 961        int rec_argc, i = 0, j;
 962        const char **rec_argv;
 963
 964        rec_argc = argc + 2;
 965        rec_argv = calloc(rec_argc + 1, sizeof(char *));
 966        rec_argv[i++] = strdup("buildid-list");
 967        rec_argv[i++] = strdup("-i");
 968        rec_argv[i++] = strdup(file_name);
 969        for (j = 1; j < argc; j++, i++)
 970                rec_argv[i] = argv[j];
 971
 972        BUG_ON(i != rec_argc);
 973
 974        return cmd_buildid_list(i, rec_argv, NULL);
 975}
 976
 977int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
 978{
 979        const char *file_name = NULL;
 980        const struct option kvm_options[] = {
 981                OPT_STRING('i', "input", &file_name, "file",
 982                           "Input file name"),
 983                OPT_STRING('o', "output", &file_name, "file",
 984                           "Output file name"),
 985                OPT_BOOLEAN(0, "guest", &perf_guest,
 986                            "Collect guest os data"),
 987                OPT_BOOLEAN(0, "host", &perf_host,
 988                            "Collect host os data"),
 989                OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
 990                           "guest mount directory under which every guest os"
 991                           " instance has a subdir"),
 992                OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
 993                           "file", "file saving guest os vmlinux"),
 994                OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
 995                           "file", "file saving guest os /proc/kallsyms"),
 996                OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
 997                           "file", "file saving guest os /proc/modules"),
 998                OPT_END()
 999        };
1000
1001
1002        const char * const kvm_usage[] = {
1003                "perf kvm [<options>] {top|record|report|diff|buildid-list|stat}",
1004                NULL
1005        };
1006
1007        perf_host  = 0;
1008        perf_guest = 1;
1009
1010        argc = parse_options(argc, argv, kvm_options, kvm_usage,
1011                        PARSE_OPT_STOP_AT_NON_OPTION);
1012        if (!argc)
1013                usage_with_options(kvm_usage, kvm_options);
1014
1015        if (!perf_host)
1016                perf_guest = 1;
1017
1018        if (!file_name) {
1019                if (perf_host && !perf_guest)
1020                        file_name = strdup("perf.data.host");
1021                else if (!perf_host && perf_guest)
1022                        file_name = strdup("perf.data.guest");
1023                else
1024                        file_name = strdup("perf.data.kvm");
1025
1026                if (!file_name) {
1027                        pr_err("Failed to allocate memory for filename\n");
1028                        return -ENOMEM;
1029                }
1030        }
1031
1032        if (!strncmp(argv[0], "rec", 3))
1033                return __cmd_record(file_name, argc, argv);
1034        else if (!strncmp(argv[0], "rep", 3))
1035                return __cmd_report(file_name, argc, argv);
1036        else if (!strncmp(argv[0], "diff", 4))
1037                return cmd_diff(argc, argv, NULL);
1038        else if (!strncmp(argv[0], "top", 3))
1039                return cmd_top(argc, argv, NULL);
1040        else if (!strncmp(argv[0], "buildid-list", 12))
1041                return __cmd_buildid_list(file_name, argc, argv);
1042#if defined(__i386__) || defined(__x86_64__)
1043        else if (!strncmp(argv[0], "stat", 4))
1044                return kvm_cmd_stat(file_name, argc, argv);
1045#endif
1046        else
1047                usage_with_options(kvm_usage, kvm_options);
1048
1049        return 0;
1050}
1051
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