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#include "builtin.h"
#include "perf.h"

#include "util/evsel.h"
#include "util/util.h"
#include "util/cache.h"
#include "util/symbol.h"
#include "util/thread.h"
#include "util/header.h"
#include "util/session.h"

#include "util/parse-options.h"
#include "util/trace-event.h"
#include "util/debug.h"
#include "util/debugfs.h"
#include "util/tool.h"
#include "util/stat.h"

#include <sys/prctl.h>

#include <semaphore.h>
#include <pthread.h>
#include <math.h>

#include "../../arch/x86/include/asm/svm.h"
#include "../../arch/x86/include/asm/vmx.h"
#include "../../arch/x86/include/asm/kvm.h"

struct event_key {
#define INVALID_KEY (~0ULL)
u64 key;
int info;
};

struct kvm_event_stats {
u64 time;
struct stats stats;
};

struct kvm_event {
struct list_head hash_entry;
struct rb_node rb;

struct event_key key;

struct kvm_event_stats total;

#define DEFAULT_VCPU_NUM 8
int max_vcpu;
struct kvm_event_stats *vcpu;
};

typedef int (*key_cmp_fun)(struct kvm_event*, struct kvm_event*, int);

struct kvm_event_key {
const char *name;
key_cmp_fun key;
};


struct perf_kvm;

struct kvm_events_ops {
bool (*is_begin_event)(struct perf_evsel *evsel,
struct perf_sample *sample,
struct event_key *key);
bool (*is_end_event)(struct perf_evsel *evsel,
struct perf_sample *sample, struct event_key *key);
void (*decode_key)(struct perf_kvm *kvm, struct event_key *key,
char decode[20]);
const char *name;
};

struct exit_reasons_table {
unsigned long exit_code;
const char *reason;
};

#define EVENTS_BITS 12
#define EVENTS_CACHE_SIZE (1UL << EVENTS_BITS)

struct perf_kvm {
struct perf_tool tool;
struct perf_session *session;

const char *file_name;
const char *report_event;
const char *sort_key;
int trace_vcpu;

struct exit_reasons_table *exit_reasons;
int exit_reasons_size;
const char *exit_reasons_isa;

struct kvm_events_ops *events_ops;
key_cmp_fun compare;
struct list_head kvm_events_cache[EVENTS_CACHE_SIZE];
u64 total_time;
u64 total_count;

struct rb_root result;
};


static void exit_event_get_key(struct perf_evsel *evsel,
struct perf_sample *sample,
struct event_key *key)
{
key->info = 0;
key->key = perf_evsel__intval(evsel, sample, "exit_reason");
}

static bool kvm_exit_event(struct perf_evsel *evsel)
{
return !strcmp(evsel->name, "kvm:kvm_exit");
}

static bool exit_event_begin(struct perf_evsel *evsel,
struct perf_sample *sample, struct event_key *key)
{
if (kvm_exit_event(evsel)) {
exit_event_get_key(evsel, sample, key);
return true;
}

return false;
}

static bool kvm_entry_event(struct perf_evsel *evsel)
{
return !strcmp(evsel->name, "kvm:kvm_entry");
}

static bool exit_event_end(struct perf_evsel *evsel,
struct perf_sample *sample __maybe_unused,
struct event_key *key __maybe_unused)
{
return kvm_entry_event(evsel);
}

static struct exit_reasons_table vmx_exit_reasons[] = {
VMX_EXIT_REASONS
};

static struct exit_reasons_table svm_exit_reasons[] = {
SVM_EXIT_REASONS
};

static const char *get_exit_reason(struct perf_kvm *kvm, u64 exit_code)
{
int i = kvm->exit_reasons_size;
struct exit_reasons_table *tbl = kvm->exit_reasons;

while (i--) {
if (tbl->exit_code == exit_code)
return tbl->reason;
tbl++;
}

pr_err("unknown kvm exit code:%lld on %s\n",
(unsigned long long)exit_code, kvm->exit_reasons_isa);
return "UNKNOWN";
}

static void exit_event_decode_key(struct perf_kvm *kvm,
struct event_key *key,
char decode[20])
{
const char *exit_reason = get_exit_reason(kvm, key->key);

scnprintf(decode, 20, "%s", exit_reason);
}

static struct kvm_events_ops exit_events = {
.is_begin_event = exit_event_begin,
.is_end_event = exit_event_end,
.decode_key = exit_event_decode_key,
.name = "VM-EXIT"
};

/*
* For the mmio events, we treat:
* the time of MMIO write: kvm_mmio(KVM_TRACE_MMIO_WRITE...) -> kvm_entry
* the time of MMIO read: kvm_exit -> kvm_mmio(KVM_TRACE_MMIO_READ...).
*/
static void mmio_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample,
struct event_key *key)
{
key->key = perf_evsel__intval(evsel, sample, "gpa");
key->info = perf_evsel__intval(evsel, sample, "type");
}

#define KVM_TRACE_MMIO_READ_UNSATISFIED 0
#define KVM_TRACE_MMIO_READ 1
#define KVM_TRACE_MMIO_WRITE 2

static bool mmio_event_begin(struct perf_evsel *evsel,
struct perf_sample *sample, struct event_key *key)
{
/* MMIO read begin event in kernel. */
if (kvm_exit_event(evsel))
return true;

/* MMIO write begin event in kernel. */
if (!strcmp(evsel->name, "kvm:kvm_mmio") &&
perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_WRITE) {
mmio_event_get_key(evsel, sample, key);
return true;
}

return false;
}

static bool mmio_event_end(struct perf_evsel *evsel, struct perf_sample *sample,
struct event_key *key)
{
/* MMIO write end event in kernel. */
if (kvm_entry_event(evsel))
return true;

/* MMIO read end event in kernel.*/
if (!strcmp(evsel->name, "kvm:kvm_mmio") &&
perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_READ) {
mmio_event_get_key(evsel, sample, key);
return true;
}

return false;
}

static void mmio_event_decode_key(struct perf_kvm *kvm __maybe_unused,
struct event_key *key,
char decode[20])
{
scnprintf(decode, 20, "%#lx:%s", (unsigned long)key->key,
key->info == KVM_TRACE_MMIO_WRITE ? "W" : "R");
}

static struct kvm_events_ops mmio_events = {
.is_begin_event = mmio_event_begin,
.is_end_event = mmio_event_end,
.decode_key = mmio_event_decode_key,
.name = "MMIO Access"
};

 /* The time of emulation pio access is from kvm_pio to kvm_entry. */
static void ioport_event_get_key(struct perf_evsel *evsel,
struct perf_sample *sample,
struct event_key *key)
{
key->key = perf_evsel__intval(evsel, sample, "port");
key->info = perf_evsel__intval(evsel, sample, "rw");
}

static bool ioport_event_begin(struct perf_evsel *evsel,
struct perf_sample *sample,
struct event_key *key)
{
if (!strcmp(evsel->name, "kvm:kvm_pio")) {
ioport_event_get_key(evsel, sample, key);
return true;
}

return false;
}

static bool ioport_event_end(struct perf_evsel *evsel,
struct perf_sample *sample __maybe_unused,
struct event_key *key __maybe_unused)
{
return kvm_entry_event(evsel);
}

static void ioport_event_decode_key(struct perf_kvm *kvm __maybe_unused,
struct event_key *key,
char decode[20])
{
scnprintf(decode, 20, "%#llx:%s", (unsigned long long)key->key,
key->info ? "POUT" : "PIN");
}

static struct kvm_events_ops ioport_events = {
.is_begin_event = ioport_event_begin,
.is_end_event = ioport_event_end,
.decode_key = ioport_event_decode_key,
.name = "IO Port Access"
};

static bool register_kvm_events_ops(struct perf_kvm *kvm)
{
bool ret = true;

if (!strcmp(kvm->report_event, "vmexit"))
kvm->events_ops = &exit_events;
else if (!strcmp(kvm->report_event, "mmio"))
kvm->events_ops = &mmio_events;
else if (!strcmp(kvm->report_event, "ioport"))
kvm->events_ops = &ioport_events;
else {
pr_err("Unknown report event:%s\n", kvm->report_event);
ret = false;
}

return ret;
}

struct vcpu_event_record {
int vcpu_id;
u64 start_time;
struct kvm_event *last_event;
};


static void init_kvm_event_record(struct perf_kvm *kvm)
{
int i;

for (i = 0; i < (int)EVENTS_CACHE_SIZE; i++)
INIT_LIST_HEAD(&kvm->kvm_events_cache[i]);
}

static int kvm_events_hash_fn(u64 key)
{
return key & (EVENTS_CACHE_SIZE - 1);
}

static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
{
int old_max_vcpu = event->max_vcpu;

if (vcpu_id < event->max_vcpu)
return true;

while (event->max_vcpu <= vcpu_id)
event->max_vcpu += DEFAULT_VCPU_NUM;

event->vcpu = realloc(event->vcpu,
event->max_vcpu * sizeof(*event->vcpu));
if (!event->vcpu) {
pr_err("Not enough memory\n");
return false;
}

memset(event->vcpu + old_max_vcpu, 0,
(event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
return true;
}

static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
{
struct kvm_event *event;

event = zalloc(sizeof(*event));
if (!event) {
pr_err("Not enough memory\n");
return NULL;
}

event->key = *key;
return event;
}

static struct kvm_event *find_create_kvm_event(struct perf_kvm *kvm,
struct event_key *key)
{
struct kvm_event *event;
struct list_head *head;

BUG_ON(key->key == INVALID_KEY);

head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)];
list_for_each_entry(event, head, hash_entry)
if (event->key.key == key->key && event->key.info == key->info)
return event;

event = kvm_alloc_init_event(key);
if (!event)
return NULL;

list_add(&event->hash_entry, head);
return event;
}

static bool handle_begin_event(struct perf_kvm *kvm,
struct vcpu_event_record *vcpu_record,
struct event_key *key, u64 timestamp)
{
struct kvm_event *event = NULL;

if (key->key != INVALID_KEY)
event = find_create_kvm_event(kvm, key);

vcpu_record->last_event = event;
vcpu_record->start_time = timestamp;
return true;
}

static void
kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff)
{
kvm_stats->time += time_diff;
update_stats(&kvm_stats->stats, time_diff);
}

static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
{
struct kvm_event_stats *kvm_stats = &event->total;

if (vcpu_id != -1)
kvm_stats = &event->vcpu[vcpu_id];

return rel_stddev_stats(stddev_stats(&kvm_stats->stats),
avg_stats(&kvm_stats->stats));
}

static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
u64 time_diff)
{
kvm_update_event_stats(&event->total, time_diff);

if (!kvm_event_expand(event, vcpu_id))
return false;

kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
return true;
}

static bool handle_end_event(struct perf_kvm *kvm,
struct vcpu_event_record *vcpu_record,
struct event_key *key,
u64 timestamp)
{
struct kvm_event *event;
u64 time_begin, time_diff;

event = vcpu_record->last_event;
time_begin = vcpu_record->start_time;

/* The begin event is not caught. */
if (!time_begin)
return true;

/*
* In some case, the 'begin event' only records the start timestamp,
* the actual event is recognized in the 'end event' (e.g. mmio-event).
*/

/* Both begin and end events did not get the key. */
if (!event && key->key == INVALID_KEY)
return true;

if (!event)
event = find_create_kvm_event(kvm, key);

if (!event)
return false;

vcpu_record->last_event = NULL;
vcpu_record->start_time = 0;

BUG_ON(timestamp < time_begin);

time_diff = timestamp - time_begin;
return update_kvm_event(event, vcpu_record->vcpu_id, time_diff);
}

static
struct vcpu_event_record *per_vcpu_record(struct thread *thread,
struct perf_evsel *evsel,
struct perf_sample *sample)
{
/* Only kvm_entry records vcpu id. */
if (!thread->priv && kvm_entry_event(evsel)) {
struct vcpu_event_record *vcpu_record;

vcpu_record = zalloc(sizeof(*vcpu_record));
if (!vcpu_record) {
pr_err("%s: Not enough memory\n", __func__);
return NULL;
}

vcpu_record->vcpu_id = perf_evsel__intval(evsel, sample, "vcpu_id");
thread->priv = vcpu_record;
}

return thread->priv;
}

static bool handle_kvm_event(struct perf_kvm *kvm,
struct thread *thread,
struct perf_evsel *evsel,
struct perf_sample *sample)
{
struct vcpu_event_record *vcpu_record;
struct event_key key = {.key = INVALID_KEY};

vcpu_record = per_vcpu_record(thread, evsel, sample);
if (!vcpu_record)
return true;

if (kvm->events_ops->is_begin_event(evsel, sample, &key))
return handle_begin_event(kvm, vcpu_record, &key, sample->time);

if (kvm->events_ops->is_end_event(evsel, sample, &key))
return handle_end_event(kvm, vcpu_record, &key, sample->time);

return true;
}

#define GET_EVENT_KEY(func, field) \
static u64 get_event_ ##func(struct kvm_event *event, int vcpu) \
{ \
if (vcpu == -1) \
return event->total.field; \
\
if (vcpu >= event->max_vcpu) \
return 0; \
\
return event->vcpu[vcpu].field; \
}

#define COMPARE_EVENT_KEY(func, field) \
GET_EVENT_KEY(func, field) \
static int compare_kvm_event_ ## func(struct kvm_event *one, \
struct kvm_event *two, int vcpu)\
{ \
return get_event_ ##func(one, vcpu) > \
get_event_ ##func(two, vcpu); \
}

GET_EVENT_KEY(time, time);
COMPARE_EVENT_KEY(count, stats.n);
COMPARE_EVENT_KEY(mean, stats.mean);

#define DEF_SORT_NAME_KEY(name, compare_key) \
{ #name, compare_kvm_event_ ## compare_key }

static struct kvm_event_key keys[] = {
DEF_SORT_NAME_KEY(sample, count),
DEF_SORT_NAME_KEY(time, mean),
{ NULL, NULL }
};

static bool select_key(struct perf_kvm *kvm)
{
int i;

for (i = 0; keys[i].name; i++) {
if (!strcmp(keys[i].name, kvm->sort_key)) {
kvm->compare = keys[i].key;
return true;
}
}

pr_err("Unknown compare key:%s\n", kvm->sort_key);
return false;
}

static void insert_to_result(struct rb_root *result, struct kvm_event *event,
key_cmp_fun bigger, int vcpu)
{
struct rb_node **rb = &result->rb_node;
struct rb_node *parent = NULL;
struct kvm_event *p;

while (*rb) {
p = container_of(*rb, struct kvm_event, rb);
parent = *rb;

if (bigger(event, p, vcpu))
rb = &(*rb)->rb_left;
else
rb = &(*rb)->rb_right;
}

rb_link_node(&event->rb, parent, rb);
rb_insert_color(&event->rb, result);
}

static void update_total_count(struct perf_kvm *kvm, struct kvm_event *event)
{
int vcpu = kvm->trace_vcpu;

kvm->total_count += get_event_count(event, vcpu);
kvm->total_time += get_event_time(event, vcpu);
}

static bool event_is_valid(struct kvm_event *event, int vcpu)
{
return !!get_event_count(event, vcpu);
}

static void sort_result(struct perf_kvm *kvm)
{
unsigned int i;
int vcpu = kvm->trace_vcpu;
struct kvm_event *event;

for (i = 0; i < EVENTS_CACHE_SIZE; i++)
list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry)
if (event_is_valid(event, vcpu)) {
update_total_count(kvm, event);
insert_to_result(&kvm->result, event,
kvm->compare, vcpu);
}
}

/* returns left most element of result, and erase it */
static struct kvm_event *pop_from_result(struct rb_root *result)
{
struct rb_node *node = rb_first(result);

if (!node)
return NULL;

rb_erase(node, result);
return container_of(node, struct kvm_event, rb);
}

static void print_vcpu_info(int vcpu)
{
pr_info("Analyze events for ");

if (vcpu == -1)
pr_info("all VCPUs:\n\n");
else
pr_info("VCPU %d:\n\n", vcpu);
}

static void print_result(struct perf_kvm *kvm)
{
char decode[20];
struct kvm_event *event;
int vcpu = kvm->trace_vcpu;

pr_info("\n\n");
print_vcpu_info(vcpu);
pr_info("%20s ", kvm->events_ops->name);
pr_info("%10s ", "Samples");
pr_info("%9s ", "Samples%");

pr_info("%9s ", "Time%");
pr_info("%16s ", "Avg time");
pr_info("\n\n");

while ((event = pop_from_result(&kvm->result))) {
u64 ecount, etime;

ecount = get_event_count(event, vcpu);
etime = get_event_time(event, vcpu);

kvm->events_ops->decode_key(kvm, &event->key, decode);
pr_info("%20s ", decode);
pr_info("%10llu ", (unsigned long long)ecount);
pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount/1e3,
kvm_event_rel_stddev(vcpu, event));
pr_info("\n");
}

pr_info("\nTotal Samples:%lld, Total events handled time:%.2fus.\n\n",
(unsigned long long)kvm->total_count, kvm->total_time / 1e3);
}

static int process_sample_event(struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct perf_evsel *evsel,
struct machine *machine)
{
struct thread *thread = machine__findnew_thread(machine, sample->tid);
struct perf_kvm *kvm = container_of(tool, struct perf_kvm, tool);

if (thread == NULL) {
pr_debug("problem processing %d event, skipping it.\n",
event->header.type);
return -1;
}

if (!handle_kvm_event(kvm, thread, evsel, sample))
return -1;

return 0;
}

static int get_cpu_isa(struct perf_session *session)
{
char *cpuid = session->header.env.cpuid;
int isa;

if (strstr(cpuid, "Intel"))
isa = 1;
else if (strstr(cpuid, "AMD"))
isa = 0;
else {
pr_err("CPU %s is not supported.\n", cpuid);
isa = -ENOTSUP;
}

return isa;
}

static int read_events(struct perf_kvm *kvm)
{
int ret;

struct perf_tool eops = {
.sample = process_sample_event,
.comm = perf_event__process_comm,
.ordered_samples = true,
};

kvm->tool = eops;
kvm->session = perf_session__new(kvm->file_name, O_RDONLY, 0, false,
&kvm->tool);
if (!kvm->session) {
pr_err("Initializing perf session failed\n");
return -EINVAL;
}

if (!perf_session__has_traces(kvm->session, "kvm record"))
return -EINVAL;

/*
* Do not use 'isa' recorded in kvm_exit tracepoint since it is not
* traced in the old kernel.
*/
ret = get_cpu_isa(kvm->session);

if (ret < 0)
return ret;

if (ret == 1) {
kvm->exit_reasons = vmx_exit_reasons;
kvm->exit_reasons_size = ARRAY_SIZE(vmx_exit_reasons);
kvm->exit_reasons_isa = "VMX";
}

return perf_session__process_events(kvm->session, &kvm->tool);
}

static bool verify_vcpu(int vcpu)
{
if (vcpu != -1 && vcpu < 0) {
pr_err("Invalid vcpu:%d.\n", vcpu);
return false;
}

return true;
}

static int kvm_events_report_vcpu(struct perf_kvm *kvm)
{
int ret = -EINVAL;
int vcpu = kvm->trace_vcpu;

if (!verify_vcpu(vcpu))
goto exit;

if (!select_key(kvm))
goto exit;

if (!register_kvm_events_ops(kvm))
goto exit;

init_kvm_event_record(kvm);
setup_pager();

ret = read_events(kvm);
if (ret)
goto exit;

sort_result(kvm);
print_result(kvm);

exit:
return ret;
}

static const char * const record_args[] = {
"record",
"-R",
"-f",
"-m", "1024",
"-c", "1",
"-e", "kvm:kvm_entry",
"-e", "kvm:kvm_exit",
"-e", "kvm:kvm_mmio",
"-e", "kvm:kvm_pio",
};

#define STRDUP_FAIL_EXIT(s) \
({ char *_p; \
_p = strdup(s); \
if (!_p) \
return -ENOMEM; \
_p; \
})

static int kvm_events_record(struct perf_kvm *kvm, int argc, const char **argv)
{
unsigned int rec_argc, i, j;
const char **rec_argv;

rec_argc = ARRAY_SIZE(record_args) + argc + 2;
rec_argv = calloc(rec_argc + 1, sizeof(char *));

if (rec_argv == NULL)
return -ENOMEM;

for (i = 0; i < ARRAY_SIZE(record_args); i++)
rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);

rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);

for (j = 1; j < (unsigned int)argc; j++, i++)
rec_argv[i] = argv[j];

return cmd_record(i, rec_argv, NULL);
}

static int kvm_events_report(struct perf_kvm *kvm, int argc, const char **argv)
{
const struct option kvm_events_report_options[] = {
OPT_STRING(0, "event", &kvm->report_event, "report event",
"event for reporting: vmexit, mmio, ioport"),
OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
"vcpu id to report"),
OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
"key for sorting: sample(sort by samples number)"
" time (sort by avg time)"),
OPT_END()
};

const char * const kvm_events_report_usage[] = {
"perf kvm stat report [<options>]",
NULL
};

symbol__init();

if (argc) {
argc = parse_options(argc, argv,
kvm_events_report_options,
kvm_events_report_usage, 0);
if (argc)
usage_with_options(kvm_events_report_usage,
kvm_events_report_options);
}

return kvm_events_report_vcpu(kvm);
}

static void print_kvm_stat_usage(void)
{
printf("Usage: perf kvm stat <command>\n\n");

printf("# Available commands:\n");
printf("\trecord: record kvm events\n");
printf("\treport: report statistical data of kvm events\n");

printf("\nOtherwise, it is the alias of 'perf stat':\n");
}

static int kvm_cmd_stat(struct perf_kvm *kvm, int argc, const char **argv)
{
if (argc == 1) {
print_kvm_stat_usage();
goto perf_stat;
}

if (!strncmp(argv[1], "rec", 3))
return kvm_events_record(kvm, argc - 1, argv + 1);

if (!strncmp(argv[1], "rep", 3))
return kvm_events_report(kvm, argc - 1 , argv + 1);

perf_stat:
return cmd_stat(argc, argv, NULL);
}

static int __cmd_record(struct perf_kvm *kvm, int argc, const char **argv)
{
int rec_argc, i = 0, j;
const char **rec_argv;

rec_argc = argc + 2;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
rec_argv[i++] = strdup("record");
rec_argv[i++] = strdup("-o");
rec_argv[i++] = strdup(kvm->file_name);
for (j = 1; j < argc; j++, i++)
rec_argv[i] = argv[j];

BUG_ON(i != rec_argc);

return cmd_record(i, rec_argv, NULL);
}

static int __cmd_report(struct perf_kvm *kvm, int argc, const char **argv)
{
int rec_argc, i = 0, j;
const char **rec_argv;

rec_argc = argc + 2;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
rec_argv[i++] = strdup("report");
rec_argv[i++] = strdup("-i");
rec_argv[i++] = strdup(kvm->file_name);
for (j = 1; j < argc; j++, i++)
rec_argv[i] = argv[j];

BUG_ON(i != rec_argc);

return cmd_report(i, rec_argv, NULL);
}

static int __cmd_buildid_list(struct perf_kvm *kvm, int argc, const char **argv)
{
int rec_argc, i = 0, j;
const char **rec_argv;

rec_argc = argc + 2;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
rec_argv[i++] = strdup("buildid-list");
rec_argv[i++] = strdup("-i");
rec_argv[i++] = strdup(kvm->file_name);
for (j = 1; j < argc; j++, i++)
rec_argv[i] = argv[j];

BUG_ON(i != rec_argc);

return cmd_buildid_list(i, rec_argv, NULL);
}

int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
{
struct perf_kvm kvm = {
.trace_vcpu = -1,
.report_event = "vmexit",
.sort_key = "sample",

.exit_reasons = svm_exit_reasons,
.exit_reasons_size = ARRAY_SIZE(svm_exit_reasons),
.exit_reasons_isa = "SVM",
};

const struct option kvm_options[] = {
OPT_STRING('i', "input", &kvm.file_name, "file",
"Input file name"),
OPT_STRING('o', "output", &kvm.file_name, "file",
"Output file name"),
OPT_BOOLEAN(0, "guest", &perf_guest,
"Collect guest os data"),
OPT_BOOLEAN(0, "host", &perf_host,
"Collect host os data"),
OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
"guest mount directory under which every guest os"
" instance has a subdir"),
OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
"file", "file saving guest os vmlinux"),
OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
"file", "file saving guest os /proc/kallsyms"),
OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
"file", "file saving guest os /proc/modules"),
OPT_END()
};


const char * const kvm_usage[] = {
"perf kvm [<options>] {top|record|report|diff|buildid-list|stat}",
NULL
};

perf_host = 0;
perf_guest = 1;

argc = parse_options(argc, argv, kvm_options, kvm_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc)
usage_with_options(kvm_usage, kvm_options);

if (!perf_host)
perf_guest = 1;

if (!kvm.file_name) {
if (perf_host && !perf_guest)
kvm.file_name = strdup("perf.data.host");
else if (!perf_host && perf_guest)
kvm.file_name = strdup("perf.data.guest");
else
kvm.file_name = strdup("perf.data.kvm");

if (!kvm.file_name) {
pr_err("Failed to allocate memory for filename\n");
return -ENOMEM;
}
}

if (!strncmp(argv[0], "rec", 3))
return __cmd_record(&kvm, argc, argv);
else if (!strncmp(argv[0], "rep", 3))
return __cmd_report(&kvm, argc, argv);
else if (!strncmp(argv[0], "diff", 4))
return cmd_diff(argc, argv, NULL);
else if (!strncmp(argv[0], "top", 3))
return cmd_top(argc, argv, NULL);
else if (!strncmp(argv[0], "buildid-list", 12))
return __cmd_buildid_list(&kvm, argc, argv);
else if (!strncmp(argv[0], "stat", 4))
return kvm_cmd_stat(&kvm, argc, argv);
else
usage_with_options(kvm_usage, kvm_options);

return 0;
}
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