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 "util/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        int i;
 318
 319        for (i = 0; i < (int)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
 332        if (vcpu_id < event->max_vcpu)
 333                return true;
 334
 335        while (event->max_vcpu <= vcpu_id)
 336                event->max_vcpu += DEFAULT_VCPU_NUM;
 337
 338        event->vcpu = realloc(event->vcpu,
 339                              event->max_vcpu * sizeof(*event->vcpu));
 340        if (!event->vcpu) {
 341                pr_err("Not enough memory\n");
 342                return false;
 343        }
 344
 345        memset(event->vcpu + old_max_vcpu, 0,
 346               (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
 347        return true;
 348}
 349
 350static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
 351{
 352        struct kvm_event *event;
 353
 354        event = zalloc(sizeof(*event));
 355        if (!event) {
 356                pr_err("Not enough memory\n");
 357                return NULL;
 358        }
 359
 360        event->key = *key;
 361        return event;
 362}
 363
 364static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm,
 365                                               struct event_key *key)
 366{
 367        struct kvm_event *event;
 368        struct list_head *head;
 369
 370        BUG_ON(key->key == INVALID_KEY);
 371
 372        head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)];
 373        list_for_each_entry(event, head, hash_entry)
 374                if (event->key.key == key->key && event->key.info == key->info)
 375                        return event;
 376
 377        event = kvm_alloc_init_event(key);
 378        if (!event)
 379                return NULL;
 380
 381        list_add(&event->hash_entry, head);
 382        return event;
 383}
 384
 385static bool handle_begin_event(struct perf_kvm_stat *kvm,
 386                               struct vcpu_event_record *vcpu_record,
 387                               struct event_key *key, u64 timestamp)
 388{
 389        struct kvm_event *event = NULL;
 390
 391        if (key->key != INVALID_KEY)
 392                event = find_create_kvm_event(kvm, key);
 393
 394        vcpu_record->last_event = event;
 395        vcpu_record->start_time = timestamp;
 396        return true;
 397}
 398
 399static void
 400kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff)
 401{
 402        kvm_stats->time += time_diff;
 403        update_stats(&kvm_stats->stats, time_diff);
 404}
 405
 406static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
 407{
 408        struct kvm_event_stats *kvm_stats = &event->total;
 409
 410        if (vcpu_id != -1)
 411                kvm_stats = &event->vcpu[vcpu_id];
 412
 413        return rel_stddev_stats(stddev_stats(&kvm_stats->stats),
 414                                avg_stats(&kvm_stats->stats));
 415}
 416
 417static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
 418                             u64 time_diff)
 419{
 420        kvm_update_event_stats(&event->total, time_diff);
 421
 422        if (!kvm_event_expand(event, vcpu_id))
 423                return false;
 424
 425        kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
 426        return true;
 427}
 428
 429static bool handle_end_event(struct perf_kvm_stat *kvm,
 430                             struct vcpu_event_record *vcpu_record,
 431                             struct event_key *key,
 432                             u64 timestamp)
 433{
 434        struct kvm_event *event;
 435        u64 time_begin, time_diff;
 436
 437        event = vcpu_record->last_event;
 438        time_begin = vcpu_record->start_time;
 439
 440        /* The begin event is not caught. */
 441        if (!time_begin)
 442                return true;
 443
 444        /*
 445         * In some case, the 'begin event' only records the start timestamp,
 446         * the actual event is recognized in the 'end event' (e.g. mmio-event).
 447         */
 448
 449        /* Both begin and end events did not get the key. */
 450        if (!event && key->key == INVALID_KEY)
 451                return true;
 452
 453        if (!event)
 454                event = find_create_kvm_event(kvm, key);
 455
 456        if (!event)
 457                return false;
 458
 459        vcpu_record->last_event = NULL;
 460        vcpu_record->start_time = 0;
 461
 462        BUG_ON(timestamp < time_begin);
 463
 464        time_diff = timestamp - time_begin;
 465        return update_kvm_event(event, vcpu_record->vcpu_id, time_diff);
 466}
 467
 468static
 469struct vcpu_event_record *per_vcpu_record(struct thread *thread,
 470                                          struct perf_evsel *evsel,
 471                                          struct perf_sample *sample)
 472{
 473        /* Only kvm_entry records vcpu id. */
 474        if (!thread->priv && kvm_entry_event(evsel)) {
 475                struct vcpu_event_record *vcpu_record;
 476
 477                vcpu_record = zalloc(sizeof(*vcpu_record));
 478                if (!vcpu_record) {
 479                        pr_err("%s: Not enough memory\n", __func__);
 480                        return NULL;
 481                }
 482
 483                vcpu_record->vcpu_id = perf_evsel__intval(evsel, sample, "vcpu_id");
 484                thread->priv = vcpu_record;
 485        }
 486
 487        return thread->priv;
 488}
 489
 490static bool handle_kvm_event(struct perf_kvm_stat *kvm,
 491                             struct thread *thread,
 492                             struct perf_evsel *evsel,
 493                             struct perf_sample *sample)
 494{
 495        struct vcpu_event_record *vcpu_record;
 496        struct event_key key = {.key = INVALID_KEY};
 497
 498        vcpu_record = per_vcpu_record(thread, evsel, sample);
 499        if (!vcpu_record)
 500                return true;
 501
 502        if (kvm->events_ops->is_begin_event(evsel, sample, &key))
 503                return handle_begin_event(kvm, vcpu_record, &key, sample->time);
 504
 505        if (kvm->events_ops->is_end_event(evsel, sample, &key))
 506                return handle_end_event(kvm, vcpu_record, &key, sample->time);
 507
 508        return true;
 509}
 510
 511#define GET_EVENT_KEY(func, field)                                      \
 512static u64 get_event_ ##func(struct kvm_event *event, int vcpu)         \
 513{                                                                       \
 514        if (vcpu == -1)                                                 \
 515                return event->total.field;                              \
 516                                                                        \
 517        if (vcpu >= event->max_vcpu)                                    \
 518                return 0;                                               \
 519                                                                        \
 520        return event->vcpu[vcpu].field;                                 \
 521}
 522
 523#define COMPARE_EVENT_KEY(func, field)                                  \
 524GET_EVENT_KEY(func, field)                                              \
 525static int compare_kvm_event_ ## func(struct kvm_event *one,            \
 526                                        struct kvm_event *two, int vcpu)\
 527{                                                                       \
 528        return get_event_ ##func(one, vcpu) >                           \
 529                                get_event_ ##func(two, vcpu);           \
 530}
 531
 532GET_EVENT_KEY(time, time);
 533COMPARE_EVENT_KEY(count, stats.n);
 534COMPARE_EVENT_KEY(mean, stats.mean);
 535
 536#define DEF_SORT_NAME_KEY(name, compare_key)                            \
 537        { #name, compare_kvm_event_ ## compare_key }
 538
 539static struct kvm_event_key keys[] = {
 540        DEF_SORT_NAME_KEY(sample, count),
 541        DEF_SORT_NAME_KEY(time, mean),
 542        { NULL, NULL }
 543};
 544
 545static bool select_key(struct perf_kvm_stat *kvm)
 546{
 547        int i;
 548
 549        for (i = 0; keys[i].name; i++) {
 550                if (!strcmp(keys[i].name, kvm->sort_key)) {
 551                        kvm->compare = keys[i].key;
 552                        return true;
 553                }
 554        }
 555
 556        pr_err("Unknown compare key:%s\n", kvm->sort_key);
 557        return false;
 558}
 559
 560static void insert_to_result(struct rb_root *result, struct kvm_event *event,
 561                             key_cmp_fun bigger, int vcpu)
 562{
 563        struct rb_node **rb = &result->rb_node;
 564        struct rb_node *parent = NULL;
 565        struct kvm_event *p;
 566
 567        while (*rb) {
 568                p = container_of(*rb, struct kvm_event, rb);
 569                parent = *rb;
 570
 571                if (bigger(event, p, vcpu))
 572                        rb = &(*rb)->rb_left;
 573                else
 574                        rb = &(*rb)->rb_right;
 575        }
 576
 577        rb_link_node(&event->rb, parent, rb);
 578        rb_insert_color(&event->rb, result);
 579}
 580
 581static void
 582update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event)
 583{
 584        int vcpu = kvm->trace_vcpu;
 585
 586        kvm->total_count += get_event_count(event, vcpu);
 587        kvm->total_time += get_event_time(event, vcpu);
 588}
 589
 590static bool event_is_valid(struct kvm_event *event, int vcpu)
 591{
 592        return !!get_event_count(event, vcpu);
 593}
 594
 595static void sort_result(struct perf_kvm_stat *kvm)
 596{
 597        unsigned int i;
 598        int vcpu = kvm->trace_vcpu;
 599        struct kvm_event *event;
 600
 601        for (i = 0; i < EVENTS_CACHE_SIZE; i++)
 602                list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry)
 603                        if (event_is_valid(event, vcpu)) {
 604                                update_total_count(kvm, event);
 605                                insert_to_result(&kvm->result, event,
 606                                                 kvm->compare, vcpu);
 607                        }
 608}
 609
 610/* returns left most element of result, and erase it */
 611static struct kvm_event *pop_from_result(struct rb_root *result)
 612{
 613        struct rb_node *node = rb_first(result);
 614
 615        if (!node)
 616                return NULL;
 617
 618        rb_erase(node, result);
 619        return container_of(node, struct kvm_event, rb);
 620}
 621
 622static void print_vcpu_info(int vcpu)
 623{
 624        pr_info("Analyze events for ");
 625
 626        if (vcpu == -1)
 627                pr_info("all VCPUs:\n\n");
 628        else
 629                pr_info("VCPU %d:\n\n", vcpu);
 630}
 631
 632static void print_result(struct perf_kvm_stat *kvm)
 633{
 634        char decode[20];
 635        struct kvm_event *event;
 636        int vcpu = kvm->trace_vcpu;
 637
 638        pr_info("\n\n");
 639        print_vcpu_info(vcpu);
 640        pr_info("%20s ", kvm->events_ops->name);
 641        pr_info("%10s ", "Samples");
 642        pr_info("%9s ", "Samples%");
 643
 644        pr_info("%9s ", "Time%");
 645        pr_info("%16s ", "Avg time");
 646        pr_info("\n\n");
 647
 648        while ((event = pop_from_result(&kvm->result))) {
 649                u64 ecount, etime;
 650
 651                ecount = get_event_count(event, vcpu);
 652                etime = get_event_time(event, vcpu);
 653
 654                kvm->events_ops->decode_key(kvm, &event->key, decode);
 655                pr_info("%20s ", decode);
 656                pr_info("%10llu ", (unsigned long long)ecount);
 657                pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
 658                pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
 659                pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount/1e3,
 660                        kvm_event_rel_stddev(vcpu, event));
 661                pr_info("\n");
 662        }
 663
 664        pr_info("\nTotal Samples:%lld, Total events handled time:%.2fus.\n\n",
 665                (unsigned long long)kvm->total_count, kvm->total_time / 1e3);
 666}
 667
 668static int process_sample_event(struct perf_tool *tool,
 669                                union perf_event *event,
 670                                struct perf_sample *sample,
 671                                struct perf_evsel *evsel,
 672                                struct machine *machine)
 673{
 674        struct thread *thread = machine__findnew_thread(machine, sample->tid);
 675        struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat,
 676                                                 tool);
 677
 678        if (thread == NULL) {
 679                pr_debug("problem processing %d event, skipping it.\n",
 680                        event->header.type);
 681                return -1;
 682        }
 683
 684        if (!handle_kvm_event(kvm, thread, evsel, sample))
 685                return -1;
 686
 687        return 0;
 688}
 689
 690static int get_cpu_isa(struct perf_session *session)
 691{
 692        char *cpuid = session->header.env.cpuid;
 693        int isa;
 694
 695        if (strstr(cpuid, "Intel"))
 696                isa = 1;
 697        else if (strstr(cpuid, "AMD"))
 698                isa = 0;
 699        else {
 700                pr_err("CPU %s is not supported.\n", cpuid);
 701                isa = -ENOTSUP;
 702        }
 703
 704        return isa;
 705}
 706
 707static int read_events(struct perf_kvm_stat *kvm)
 708{
 709        int ret;
 710
 711        struct perf_tool eops = {
 712                .sample                 = process_sample_event,
 713                .comm                   = perf_event__process_comm,
 714                .ordered_samples        = true,
 715        };
 716
 717        kvm->tool = eops;
 718        kvm->session = perf_session__new(kvm->file_name, O_RDONLY, 0, false,
 719                                         &kvm->tool);
 720        if (!kvm->session) {
 721                pr_err("Initializing perf session failed\n");
 722                return -EINVAL;
 723        }
 724
 725        if (!perf_session__has_traces(kvm->session, "kvm record"))
 726                return -EINVAL;
 727
 728        /*
 729         * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
 730         * traced in the old kernel.
 731         */
 732        ret = get_cpu_isa(kvm->session);
 733
 734        if (ret < 0)
 735                return ret;
 736
 737        if (ret == 1) {
 738                kvm->exit_reasons = vmx_exit_reasons;
 739                kvm->exit_reasons_size = ARRAY_SIZE(vmx_exit_reasons);
 740                kvm->exit_reasons_isa = "VMX";
 741        }
 742
 743        return perf_session__process_events(kvm->session, &kvm->tool);
 744}
 745
 746static bool verify_vcpu(int vcpu)
 747{
 748        if (vcpu != -1 && vcpu < 0) {
 749                pr_err("Invalid vcpu:%d.\n", vcpu);
 750                return false;
 751        }
 752
 753        return true;
 754}
 755
 756static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
 757{
 758        int ret = -EINVAL;
 759        int vcpu = kvm->trace_vcpu;
 760
 761        if (!verify_vcpu(vcpu))
 762                goto exit;
 763
 764        if (!select_key(kvm))
 765                goto exit;
 766
 767        if (!register_kvm_events_ops(kvm))
 768                goto exit;
 769
 770        init_kvm_event_record(kvm);
 771        setup_pager();
 772
 773        ret = read_events(kvm);
 774        if (ret)
 775                goto exit;
 776
 777        sort_result(kvm);
 778        print_result(kvm);
 779
 780exit:
 781        return ret;
 782}
 783
 784static const char * const record_args[] = {
 785        "record",
 786        "-R",
 787        "-f",
 788        "-m", "1024",
 789        "-c", "1",
 790        "-e", "kvm:kvm_entry",
 791        "-e", "kvm:kvm_exit",
 792        "-e", "kvm:kvm_mmio",
 793        "-e", "kvm:kvm_pio",
 794};
 795
 796#define STRDUP_FAIL_EXIT(s)             \
 797        ({      char *_p;               \
 798        _p = strdup(s);         \
 799                if (!_p)                \
 800                        return -ENOMEM; \
 801                _p;                     \
 802        })
 803
 804static int
 805kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
 806{
 807        unsigned int rec_argc, i, j;
 808        const char **rec_argv;
 809
 810        rec_argc = ARRAY_SIZE(record_args) + argc + 2;
 811        rec_argv = calloc(rec_argc + 1, sizeof(char *));
 812
 813        if (rec_argv == NULL)
 814                return -ENOMEM;
 815
 816        for (i = 0; i < ARRAY_SIZE(record_args); i++)
 817                rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);
 818
 819        rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
 820        rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);
 821
 822        for (j = 1; j < (unsigned int)argc; j++, i++)
 823                rec_argv[i] = argv[j];
 824
 825        return cmd_record(i, rec_argv, NULL);
 826}
 827
 828static int
 829kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
 830{
 831        const struct option kvm_events_report_options[] = {
 832                OPT_STRING(0, "event", &kvm->report_event, "report event",
 833                            "event for reporting: vmexit, mmio, ioport"),
 834                OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
 835                            "vcpu id to report"),
 836                OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
 837                            "key for sorting: sample(sort by samples number)"
 838                            " time (sort by avg time)"),
 839                OPT_END()
 840        };
 841
 842        const char * const kvm_events_report_usage[] = {
 843                "perf kvm stat report [<options>]",
 844                NULL
 845        };
 846
 847        symbol__init();
 848
 849        if (argc) {
 850                argc = parse_options(argc, argv,
 851                                     kvm_events_report_options,
 852                                     kvm_events_report_usage, 0);
 853                if (argc)
 854                        usage_with_options(kvm_events_report_usage,
 855                                           kvm_events_report_options);
 856        }
 857
 858        return kvm_events_report_vcpu(kvm);
 859}
 860
 861static void print_kvm_stat_usage(void)
 862{
 863        printf("Usage: perf kvm stat <command>\n\n");
 864
 865        printf("# Available commands:\n");
 866        printf("\trecord: record kvm events\n");
 867        printf("\treport: report statistical data of kvm events\n");
 868
 869        printf("\nOtherwise, it is the alias of 'perf stat':\n");
 870}
 871
 872static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
 873{
 874        struct perf_kvm_stat kvm = {
 875                .file_name = file_name,
 876
 877                .trace_vcpu     = -1,
 878                .report_event   = "vmexit",
 879                .sort_key       = "sample",
 880
 881                .exit_reasons = svm_exit_reasons,
 882                .exit_reasons_size = ARRAY_SIZE(svm_exit_reasons),
 883                .exit_reasons_isa = "SVM",
 884        };
 885
 886        if (argc == 1) {
 887                print_kvm_stat_usage();
 888                goto perf_stat;
 889        }
 890
 891        if (!strncmp(argv[1], "rec", 3))
 892                return kvm_events_record(&kvm, argc - 1, argv + 1);
 893
 894        if (!strncmp(argv[1], "rep", 3))
 895                return kvm_events_report(&kvm, argc - 1 , argv + 1);
 896
 897perf_stat:
 898        return cmd_stat(argc, argv, NULL);
 899}
 900#endif
 901
 902static int __cmd_record(const char *file_name, int argc, const char **argv)
 903{
 904        int rec_argc, i = 0, j;
 905        const char **rec_argv;
 906
 907        rec_argc = argc + 2;
 908        rec_argv = calloc(rec_argc + 1, sizeof(char *));
 909        rec_argv[i++] = strdup("record");
 910        rec_argv[i++] = strdup("-o");
 911        rec_argv[i++] = strdup(file_name);
 912        for (j = 1; j < argc; j++, i++)
 913                rec_argv[i] = argv[j];
 914
 915        BUG_ON(i != rec_argc);
 916
 917        return cmd_record(i, rec_argv, NULL);
 918}
 919
 920static int __cmd_report(const char *file_name, int argc, const char **argv)
 921{
 922        int rec_argc, i = 0, j;
 923        const char **rec_argv;
 924
 925        rec_argc = argc + 2;
 926        rec_argv = calloc(rec_argc + 1, sizeof(char *));
 927        rec_argv[i++] = strdup("report");
 928        rec_argv[i++] = strdup("-i");
 929        rec_argv[i++] = strdup(file_name);
 930        for (j = 1; j < argc; j++, i++)
 931                rec_argv[i] = argv[j];
 932
 933        BUG_ON(i != rec_argc);
 934
 935        return cmd_report(i, rec_argv, NULL);
 936}
 937
 938static int
 939__cmd_buildid_list(const char *file_name, int argc, const char **argv)
 940{
 941        int rec_argc, i = 0, j;
 942        const char **rec_argv;
 943
 944        rec_argc = argc + 2;
 945        rec_argv = calloc(rec_argc + 1, sizeof(char *));
 946        rec_argv[i++] = strdup("buildid-list");
 947        rec_argv[i++] = strdup("-i");
 948        rec_argv[i++] = strdup(file_name);
 949        for (j = 1; j < argc; j++, i++)
 950                rec_argv[i] = argv[j];
 951
 952        BUG_ON(i != rec_argc);
 953
 954        return cmd_buildid_list(i, rec_argv, NULL);
 955}
 956
 957int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
 958{
 959        const char *file_name;
 960
 961        const struct option kvm_options[] = {
 962                OPT_STRING('i', "input", &file_name, "file",
 963                           "Input file name"),
 964                OPT_STRING('o', "output", &file_name, "file",
 965                           "Output file name"),
 966                OPT_BOOLEAN(0, "guest", &perf_guest,
 967                            "Collect guest os data"),
 968                OPT_BOOLEAN(0, "host", &perf_host,
 969                            "Collect host os data"),
 970                OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
 971                           "guest mount directory under which every guest os"
 972                           " instance has a subdir"),
 973                OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
 974                           "file", "file saving guest os vmlinux"),
 975                OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
 976                           "file", "file saving guest os /proc/kallsyms"),
 977                OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
 978                           "file", "file saving guest os /proc/modules"),
 979                OPT_END()
 980        };
 981
 982
 983        const char * const kvm_usage[] = {
 984                "perf kvm [<options>] {top|record|report|diff|buildid-list|stat}",
 985                NULL
 986        };
 987
 988        perf_host  = 0;
 989        perf_guest = 1;
 990
 991        argc = parse_options(argc, argv, kvm_options, kvm_usage,
 992                        PARSE_OPT_STOP_AT_NON_OPTION);
 993        if (!argc)
 994                usage_with_options(kvm_usage, kvm_options);
 995
 996        if (!perf_host)
 997                perf_guest = 1;
 998
 999        if (!file_name) {
1000                if (perf_host && !perf_guest)
1001                        file_name = strdup("perf.data.host");
1002                else if (!perf_host && perf_guest)
1003                        file_name = strdup("perf.data.guest");
1004                else
1005                        file_name = strdup("perf.data.kvm");
1006
1007                if (!file_name) {
1008                        pr_err("Failed to allocate memory for filename\n");
1009                        return -ENOMEM;
1010                }
1011        }
1012
1013        if (!strncmp(argv[0], "rec", 3))
1014                return __cmd_record(file_name, argc, argv);
1015        else if (!strncmp(argv[0], "rep", 3))
1016                return __cmd_report(file_name, argc, argv);
1017        else if (!strncmp(argv[0], "diff", 4))
1018                return cmd_diff(argc, argv, NULL);
1019        else if (!strncmp(argv[0], "top", 3))
1020                return cmd_top(argc, argv, NULL);
1021        else if (!strncmp(argv[0], "buildid-list", 12))
1022                return __cmd_buildid_list(file_name, argc, argv);
1023#if defined(__i386__) || defined(__x86_64__)
1024        else if (!strncmp(argv[0], "stat", 4))
1025                return kvm_cmd_stat(file_name, argc, argv);
1026#endif
1027        else
1028                usage_with_options(kvm_usage, kvm_options);
1029
1030        return 0;
1031}
1032
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