Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2191 insertions, 0 deletions

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
new file mode 100644
index 0000000000..71165036e4
--- /dev/null
+++ b/tools/perf/builtin-kvm.c
@@ -0,0 +1,2191 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "builtin.h"
+#include "perf.h"
+
+#include "util/build-id.h"
+#include "util/evsel.h"
+#include "util/evlist.h"
+#include "util/mmap.h"
+#include "util/term.h"
+#include "util/symbol.h"
+#include "util/thread.h"
+#include "util/header.h"
+#include "util/session.h"
+#include "util/intlist.h"
+#include <subcmd/pager.h>
+#include <subcmd/parse-options.h>
+#include "util/trace-event.h"
+#include "util/debug.h"
+#include "util/tool.h"
+#include "util/stat.h"
+#include "util/synthetic-events.h"
+#include "util/top.h"
+#include "util/data.h"
+#include "util/ordered-events.h"
+#include "util/kvm-stat.h"
+#include "util/util.h"
+#include "ui/browsers/hists.h"
+#include "ui/progress.h"
+#include "ui/ui.h"
+#include "util/string2.h"
+
+#include <sys/prctl.h>
+#ifdef HAVE_TIMERFD_SUPPORT
+#include <sys/timerfd.h>
+#endif
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/time64.h>
+#include <linux/zalloc.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <poll.h>
+#include <termios.h>
+#include <semaphore.h>
+#include <signal.h>
+#include <math.h>
+#include <perf/mmap.h>
+
+#if defined(HAVE_KVM_STAT_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
+#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 int64_t cmp_event_ ## func(struct kvm_event *one,		\
+			      struct kvm_event *two, int vcpu)		\
+{									\
+	return get_event_ ##func(one, vcpu) -				\
+	       get_event_ ##func(two, vcpu);				\
+}
+
+COMPARE_EVENT_KEY(time, time);
+COMPARE_EVENT_KEY(max, stats.max);
+COMPARE_EVENT_KEY(min, stats.min);
+COMPARE_EVENT_KEY(count, stats.n);
+COMPARE_EVENT_KEY(mean, stats.mean);
+
+struct kvm_hists {
+	struct hists		hists;
+	struct perf_hpp_list	list;
+};
+
+struct kvm_dimension {
+	const char *name;
+	const char *header;
+	int width;
+	int64_t (*cmp)(struct perf_hpp_fmt *fmt, struct hist_entry *left,
+		       struct hist_entry *right);
+	int (*entry)(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+		     struct hist_entry *he);
+};
+
+struct kvm_fmt {
+	struct perf_hpp_fmt	fmt;
+	struct kvm_dimension	*dim;
+};
+
+static struct kvm_hists kvm_hists;
+
+static int64_t ev_name_cmp(struct perf_hpp_fmt *fmt __maybe_unused,
+			   struct hist_entry *left,
+			   struct hist_entry *right)
+{
+	/* Return opposite number for sorting in alphabetical order */
+	return -strcmp(left->kvm_info->name, right->kvm_info->name);
+}
+
+static int fmt_width(struct perf_hpp_fmt *fmt,
+		     struct perf_hpp *hpp __maybe_unused,
+		     struct hists *hists __maybe_unused);
+
+static int ev_name_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+			 struct hist_entry *he)
+{
+	int width = fmt_width(fmt, hpp, he->hists);
+
+	return scnprintf(hpp->buf, hpp->size, "%*s", width, he->kvm_info->name);
+}
+
+static struct kvm_dimension dim_event = {
+	.header		= "Event name",
+	.name		= "ev_name",
+	.cmp		= ev_name_cmp,
+	.entry		= ev_name_entry,
+	.width		= 40,
+};
+
+#define EV_METRIC_CMP(metric)						\
+static int64_t ev_cmp_##metric(struct perf_hpp_fmt *fmt __maybe_unused,	\
+			       struct hist_entry *left,			\
+			       struct hist_entry *right)		\
+{									\
+	struct kvm_event *event_left;					\
+	struct kvm_event *event_right;					\
+	struct perf_kvm_stat *perf_kvm;					\
+									\
+	event_left  = container_of(left, struct kvm_event, he);		\
+	event_right = container_of(right, struct kvm_event, he);	\
+									\
+	perf_kvm = event_left->perf_kvm;				\
+	return cmp_event_##metric(event_left, event_right,		\
+				  perf_kvm->trace_vcpu);		\
+}
+
+EV_METRIC_CMP(time)
+EV_METRIC_CMP(count)
+EV_METRIC_CMP(max)
+EV_METRIC_CMP(min)
+EV_METRIC_CMP(mean)
+
+#define EV_METRIC_ENTRY(metric)						\
+static int ev_entry_##metric(struct perf_hpp_fmt *fmt,			\
+			     struct perf_hpp *hpp,			\
+			     struct hist_entry *he)			\
+{									\
+	struct kvm_event *event;					\
+	int width = fmt_width(fmt, hpp, he->hists);			\
+	struct perf_kvm_stat *perf_kvm;					\
+									\
+	event = container_of(he, struct kvm_event, he);			\
+	perf_kvm = event->perf_kvm;					\
+	return scnprintf(hpp->buf, hpp->size, "%*lu", width,		\
+		get_event_##metric(event, perf_kvm->trace_vcpu));	\
+}
+
+EV_METRIC_ENTRY(time)
+EV_METRIC_ENTRY(count)
+EV_METRIC_ENTRY(max)
+EV_METRIC_ENTRY(min)
+
+static struct kvm_dimension dim_time = {
+	.header		= "Time (ns)",
+	.name		= "time",
+	.cmp		= ev_cmp_time,
+	.entry		= ev_entry_time,
+	.width		= 12,
+};
+
+static struct kvm_dimension dim_count = {
+	.header		= "Samples",
+	.name		= "sample",
+	.cmp		= ev_cmp_count,
+	.entry		= ev_entry_count,
+	.width		= 12,
+};
+
+static struct kvm_dimension dim_max_time = {
+	.header		= "Max Time (ns)",
+	.name		= "max_t",
+	.cmp		= ev_cmp_max,
+	.entry		= ev_entry_max,
+	.width		= 14,
+};
+
+static struct kvm_dimension dim_min_time = {
+	.header		= "Min Time (ns)",
+	.name		= "min_t",
+	.cmp		= ev_cmp_min,
+	.entry		= ev_entry_min,
+	.width		= 14,
+};
+
+static int ev_entry_mean(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+			 struct hist_entry *he)
+{
+	struct kvm_event *event;
+	int width = fmt_width(fmt, hpp, he->hists);
+	struct perf_kvm_stat *perf_kvm;
+
+	event = container_of(he, struct kvm_event, he);
+	perf_kvm = event->perf_kvm;
+	return scnprintf(hpp->buf, hpp->size, "%*lu", width,
+			 get_event_mean(event, perf_kvm->trace_vcpu));
+}
+
+static struct kvm_dimension dim_mean_time = {
+	.header		= "Mean Time (ns)",
+	.name		= "mean_t",
+	.cmp		= ev_cmp_mean,
+	.entry		= ev_entry_mean,
+	.width		= 14,
+};
+
+#define PERC_STR(__s, __v)				\
+({							\
+	scnprintf(__s, sizeof(__s), "%.2F%%", __v);	\
+	__s;						\
+})
+
+static double percent(u64 st, u64 tot)
+{
+	return tot ? 100. * (double) st / (double) tot : 0;
+}
+
+#define EV_METRIC_PERCENT(metric)					\
+static int ev_percent_##metric(struct hist_entry *he)			\
+{									\
+	struct kvm_event *event;					\
+	struct perf_kvm_stat *perf_kvm;					\
+									\
+	event = container_of(he, struct kvm_event, he);			\
+	perf_kvm = event->perf_kvm;					\
+									\
+	return percent(get_event_##metric(event, perf_kvm->trace_vcpu),	\
+		       perf_kvm->total_##metric);			\
+}
+
+EV_METRIC_PERCENT(time)
+EV_METRIC_PERCENT(count)
+
+static int ev_entry_time_precent(struct perf_hpp_fmt *fmt,
+				 struct perf_hpp *hpp,
+				 struct hist_entry *he)
+{
+	int width = fmt_width(fmt, hpp, he->hists);
+	double per;
+	char buf[10];
+
+	per = ev_percent_time(he);
+	return scnprintf(hpp->buf, hpp->size, "%*s", width, PERC_STR(buf, per));
+}
+
+static int64_t
+ev_cmp_time_precent(struct perf_hpp_fmt *fmt __maybe_unused,
+		    struct hist_entry *left, struct hist_entry *right)
+{
+	double per_left;
+	double per_right;
+
+	per_left  = ev_percent_time(left);
+	per_right = ev_percent_time(right);
+
+	return per_left - per_right;
+}
+
+static struct kvm_dimension dim_time_percent = {
+	.header		= "Time%",
+	.name		= "percent_time",
+	.cmp		= ev_cmp_time_precent,
+	.entry		= ev_entry_time_precent,
+	.width		= 12,
+};
+
+static int ev_entry_count_precent(struct perf_hpp_fmt *fmt,
+				  struct perf_hpp *hpp,
+				  struct hist_entry *he)
+{
+	int width = fmt_width(fmt, hpp, he->hists);
+	double per;
+	char buf[10];
+
+	per = ev_percent_count(he);
+	return scnprintf(hpp->buf, hpp->size, "%*s", width, PERC_STR(buf, per));
+}
+
+static int64_t
+ev_cmp_count_precent(struct perf_hpp_fmt *fmt __maybe_unused,
+		     struct hist_entry *left, struct hist_entry *right)
+{
+	double per_left;
+	double per_right;
+
+	per_left  = ev_percent_count(left);
+	per_right = ev_percent_count(right);
+
+	return per_left - per_right;
+}
+
+static struct kvm_dimension dim_count_percent = {
+	.header		= "Sample%",
+	.name		= "percent_sample",
+	.cmp		= ev_cmp_count_precent,
+	.entry		= ev_entry_count_precent,
+	.width		= 12,
+};
+
+static struct kvm_dimension *dimensions[] = {
+	&dim_event,
+	&dim_time,
+	&dim_time_percent,
+	&dim_count,
+	&dim_count_percent,
+	&dim_max_time,
+	&dim_min_time,
+	&dim_mean_time,
+	NULL,
+};
+
+static int fmt_width(struct perf_hpp_fmt *fmt,
+		     struct perf_hpp *hpp __maybe_unused,
+		     struct hists *hists __maybe_unused)
+{
+	struct kvm_fmt *kvm_fmt;
+
+	kvm_fmt = container_of(fmt, struct kvm_fmt, fmt);
+	return kvm_fmt->dim->width;
+}
+
+static int fmt_header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+		      struct hists *hists, int line __maybe_unused,
+		      int *span __maybe_unused)
+{
+	struct kvm_fmt *kvm_fmt;
+	struct kvm_dimension *dim;
+	int width = fmt_width(fmt, hpp, hists);
+
+	kvm_fmt = container_of(fmt, struct kvm_fmt, fmt);
+	dim = kvm_fmt->dim;
+
+	return scnprintf(hpp->buf, hpp->size, "%*s", width, dim->header);
+}
+
+static bool fmt_equal(struct perf_hpp_fmt *a, struct perf_hpp_fmt *b)
+{
+	struct kvm_fmt *kvm_fmt_a = container_of(a, struct kvm_fmt, fmt);
+	struct kvm_fmt *kvm_fmt_b = container_of(b, struct kvm_fmt, fmt);
+
+	return kvm_fmt_a->dim == kvm_fmt_b->dim;
+}
+
+static void fmt_free(struct perf_hpp_fmt *fmt)
+{
+	struct kvm_fmt *kvm_fmt;
+
+	kvm_fmt = container_of(fmt, struct kvm_fmt, fmt);
+	free(kvm_fmt);
+}
+
+static struct kvm_dimension *get_dimension(const char *name)
+{
+	unsigned int i;
+
+	for (i = 0; dimensions[i] != NULL; i++) {
+		if (!strcmp(dimensions[i]->name, name))
+			return dimensions[i];
+	}
+
+	return NULL;
+}
+
+static struct kvm_fmt *get_format(const char *name)
+{
+	struct kvm_dimension *dim = get_dimension(name);
+	struct kvm_fmt *kvm_fmt;
+	struct perf_hpp_fmt *fmt;
+
+	if (!dim)
+		return NULL;
+
+	kvm_fmt = zalloc(sizeof(*kvm_fmt));
+	if (!kvm_fmt)
+		return NULL;
+
+	kvm_fmt->dim = dim;
+
+	fmt = &kvm_fmt->fmt;
+	INIT_LIST_HEAD(&fmt->list);
+	INIT_LIST_HEAD(&fmt->sort_list);
+	fmt->cmp	= dim->cmp;
+	fmt->sort	= dim->cmp;
+	fmt->color	= NULL;
+	fmt->entry	= dim->entry;
+	fmt->header	= fmt_header;
+	fmt->width	= fmt_width;
+	fmt->collapse	= dim->cmp;
+	fmt->equal	= fmt_equal;
+	fmt->free	= fmt_free;
+
+	return kvm_fmt;
+}
+
+static int kvm_hists__init_output(struct perf_hpp_list *hpp_list, char *name)
+{
+	struct kvm_fmt *kvm_fmt = get_format(name);
+
+	if (!kvm_fmt) {
+		pr_warning("Fail to find format for output field %s.\n", name);
+		return -EINVAL;
+	}
+
+	perf_hpp_list__column_register(hpp_list, &kvm_fmt->fmt);
+	return 0;
+}
+
+static int kvm_hists__init_sort(struct perf_hpp_list *hpp_list, char *name)
+{
+	struct kvm_fmt *kvm_fmt = get_format(name);
+
+	if (!kvm_fmt) {
+		pr_warning("Fail to find format for sorting %s.\n", name);
+		return -EINVAL;
+	}
+
+	perf_hpp_list__register_sort_field(hpp_list, &kvm_fmt->fmt);
+	return 0;
+}
+
+static int kvm_hpp_list__init(char *list,
+			      struct perf_hpp_list *hpp_list,
+			      int (*fn)(struct perf_hpp_list *hpp_list,
+					char *name))
+{
+	char *tmp, *tok;
+	int ret;
+
+	if (!list || !fn)
+		return 0;
+
+	for (tok = strtok_r(list, ", ", &tmp); tok;
+	     tok = strtok_r(NULL, ", ", &tmp)) {
+		ret = fn(hpp_list, tok);
+		if (!ret)
+			continue;
+
+		/* Handle errors */
+		if (ret == -EINVAL)
+			pr_err("Invalid field key: '%s'", tok);
+		else if (ret == -ESRCH)
+			pr_err("Unknown field key: '%s'", tok);
+		else
+			pr_err("Fail to initialize for field key: '%s'", tok);
+
+		break;
+	}
+
+	return ret;
+}
+
+static int kvm_hpp_list__parse(struct perf_hpp_list *hpp_list,
+			       const char *output_, const char *sort_)
+{
+	char *output = output_ ? strdup(output_) : NULL;
+	char *sort = sort_ ? strdup(sort_) : NULL;
+	int ret;
+
+	ret = kvm_hpp_list__init(output, hpp_list, kvm_hists__init_output);
+	if (ret)
+		goto out;
+
+	ret = kvm_hpp_list__init(sort, hpp_list, kvm_hists__init_sort);
+	if (ret)
+		goto out;
+
+	/* Copy sort keys to output fields */
+	perf_hpp__setup_output_field(hpp_list);
+
+	/* and then copy output fields to sort keys */
+	perf_hpp__append_sort_keys(hpp_list);
+out:
+	free(output);
+	free(sort);
+	return ret;
+}
+
+static int kvm_hists__init(void)
+{
+	kvm_hists.list.nr_header_lines = 1;
+	__hists__init(&kvm_hists.hists, &kvm_hists.list);
+	perf_hpp_list__init(&kvm_hists.list);
+	return kvm_hpp_list__parse(&kvm_hists.list, NULL, "ev_name");
+}
+
+static int kvm_hists__reinit(const char *output, const char *sort)
+{
+	perf_hpp__reset_output_field(&kvm_hists.list);
+	return kvm_hpp_list__parse(&kvm_hists.list, output, sort);
+}
+static void print_result(struct perf_kvm_stat *kvm);
+
+#ifdef HAVE_SLANG_SUPPORT
+static void kvm_browser__update_nr_entries(struct hist_browser *hb)
+{
+	struct rb_node *nd = rb_first_cached(&hb->hists->entries);
+	u64 nr_entries = 0;
+
+	for (; nd; nd = rb_next(nd)) {
+		struct hist_entry *he = rb_entry(nd, struct hist_entry,
+						 rb_node);
+
+		if (!he->filtered)
+			nr_entries++;
+	}
+
+	hb->nr_non_filtered_entries = nr_entries;
+}
+
+static int kvm_browser__title(struct hist_browser *browser,
+			      char *buf, size_t size)
+{
+	scnprintf(buf, size, "KVM event statistics (%lu entries)",
+		  browser->nr_non_filtered_entries);
+	return 0;
+}
+
+static struct hist_browser*
+perf_kvm_browser__new(struct hists *hists)
+{
+	struct hist_browser *browser = hist_browser__new(hists);
+
+	if (browser)
+		browser->title = kvm_browser__title;
+
+	return browser;
+}
+
+static int kvm__hists_browse(struct hists *hists)
+{
+	struct hist_browser *browser;
+	int key = -1;
+
+	browser = perf_kvm_browser__new(hists);
+	if (browser == NULL)
+		return -1;
+
+	/* reset abort key so that it can get Ctrl-C as a key */
+	SLang_reset_tty();
+	SLang_init_tty(0, 0, 0);
+
+	kvm_browser__update_nr_entries(browser);
+
+	while (1) {
+		key = hist_browser__run(browser, "? - help", true, 0);
+
+		switch (key) {
+		case 'q':
+			goto out;
+		default:
+			break;
+		}
+	}
+
+out:
+	hist_browser__delete(browser);
+	return 0;
+}
+
+static void kvm_display(struct perf_kvm_stat *kvm)
+{
+	if (!use_browser)
+		print_result(kvm);
+	else
+		kvm__hists_browse(&kvm_hists.hists);
+}
+
+#else
+
+static void kvm_display(struct perf_kvm_stat *kvm)
+{
+	use_browser = 0;
+	print_result(kvm);
+}
+
+#endif /* HAVE_SLANG_SUPPORT */
+
+#endif // defined(HAVE_KVM_STAT_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
+
+static const char *get_filename_for_perf_kvm(void)
+{
+	const char *filename;
+
+	if (perf_host && !perf_guest)
+		filename = strdup("perf.data.host");
+	else if (!perf_host && perf_guest)
+		filename = strdup("perf.data.guest");
+	else
+		filename = strdup("perf.data.kvm");
+
+	return filename;
+}
+
+#if defined(HAVE_KVM_STAT_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
+
+void exit_event_get_key(struct evsel *evsel,
+			struct perf_sample *sample,
+			struct event_key *key)
+{
+	key->info = 0;
+	key->key  = evsel__intval(evsel, sample, kvm_exit_reason);
+}
+
+bool kvm_exit_event(struct evsel *evsel)
+{
+	return evsel__name_is(evsel, kvm_exit_trace);
+}
+
+bool exit_event_begin(struct 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;
+}
+
+bool kvm_entry_event(struct evsel *evsel)
+{
+	return evsel__name_is(evsel, kvm_entry_trace);
+}
+
+bool exit_event_end(struct evsel *evsel,
+		    struct perf_sample *sample __maybe_unused,
+		    struct event_key *key __maybe_unused)
+{
+	return kvm_entry_event(evsel);
+}
+
+static const char *get_exit_reason(struct perf_kvm_stat *kvm,
+				   struct exit_reasons_table *tbl,
+				   u64 exit_code)
+{
+	while (tbl->reason != NULL) {
+		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";
+}
+
+void exit_event_decode_key(struct perf_kvm_stat *kvm,
+			   struct event_key *key,
+			   char *decode)
+{
+	const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
+						  key->key);
+
+	scnprintf(decode, KVM_EVENT_NAME_LEN, "%s", exit_reason);
+}
+
+static bool register_kvm_events_ops(struct perf_kvm_stat *kvm)
+{
+	struct kvm_reg_events_ops *events_ops = kvm_reg_events_ops;
+
+	for (events_ops = kvm_reg_events_ops; events_ops->name; events_ops++) {
+		if (!strcmp(events_ops->name, kvm->report_event)) {
+			kvm->events_ops = events_ops->ops;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+struct vcpu_event_record {
+	int vcpu_id;
+	u64 start_time;
+	struct kvm_event *last_event;
+};
+
+#ifdef HAVE_TIMERFD_SUPPORT
+static void clear_events_cache_stats(void)
+{
+	struct rb_root_cached *root;
+	struct rb_node *nd;
+	struct kvm_event *event;
+	int i;
+
+	if (hists__has(&kvm_hists.hists, need_collapse))
+		root = &kvm_hists.hists.entries_collapsed;
+	else
+		root = kvm_hists.hists.entries_in;
+
+	for (nd = rb_first_cached(root); nd; nd = rb_next(nd)) {
+		struct hist_entry *he;
+
+		he = rb_entry(nd, struct hist_entry, rb_node_in);
+		event = container_of(he, struct kvm_event, he);
+
+		/* reset stats for event */
+		event->total.time = 0;
+		init_stats(&event->total.stats);
+
+		for (i = 0; i < event->max_vcpu; ++i) {
+			event->vcpu[i].time = 0;
+			init_stats(&event->vcpu[i].stats);
+		}
+	}
+}
+#endif
+
+static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
+{
+	int old_max_vcpu = event->max_vcpu;
+	void *prev;
+
+	if (vcpu_id < event->max_vcpu)
+		return true;
+
+	while (event->max_vcpu <= vcpu_id)
+		event->max_vcpu += DEFAULT_VCPU_NUM;
+
+	prev = event->vcpu;
+	event->vcpu = realloc(event->vcpu,
+			      event->max_vcpu * sizeof(*event->vcpu));
+	if (!event->vcpu) {
+		free(prev);
+		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 void *kvm_he_zalloc(size_t size)
+{
+	struct kvm_event *kvm_ev;
+
+	kvm_ev = zalloc(size + sizeof(*kvm_ev));
+	if (!kvm_ev)
+		return NULL;
+
+	init_stats(&kvm_ev->total.stats);
+	hists__inc_nr_samples(&kvm_hists.hists, 0);
+	return &kvm_ev->he;
+}
+
+static void kvm_he_free(void *he)
+{
+	struct kvm_event *kvm_ev;
+
+	kvm_ev = container_of(he, struct kvm_event, he);
+	free(kvm_ev);
+}
+
+static struct hist_entry_ops kvm_ev_entry_ops = {
+	.new	= kvm_he_zalloc,
+	.free	= kvm_he_free,
+};
+
+static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm,
+					       struct event_key *key,
+					       struct perf_sample *sample)
+{
+	struct kvm_event *event;
+	struct hist_entry *he;
+	struct kvm_info *ki;
+
+	BUG_ON(key->key == INVALID_KEY);
+
+	ki = kvm_info__new();
+	if (!ki) {
+		pr_err("Failed to allocate kvm info\n");
+		return NULL;
+	}
+
+	kvm->events_ops->decode_key(kvm, key, ki->name);
+	he = hists__add_entry_ops(&kvm_hists.hists, &kvm_ev_entry_ops,
+				  &kvm->al, NULL, NULL, NULL, ki, sample, true);
+	if (he == NULL) {
+		pr_err("Failed to allocate hist entry\n");
+		free(ki);
+		return NULL;
+	}
+
+	event = container_of(he, struct kvm_event, he);
+	if (!event->perf_kvm) {
+		event->perf_kvm = kvm;
+		event->key = *key;
+	}
+
+	return event;
+}
+
+static bool handle_begin_event(struct perf_kvm_stat *kvm,
+			       struct vcpu_event_record *vcpu_record,
+			       struct event_key *key,
+			       struct perf_sample *sample)
+{
+	struct kvm_event *event = NULL;
+
+	if (key->key != INVALID_KEY)
+		event = find_create_kvm_event(kvm, key, sample);
+
+	vcpu_record->last_event = event;
+	vcpu_record->start_time = sample->time;
+	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 perf_kvm_stat *kvm,
+			     struct kvm_event *event, int vcpu_id,
+			     u64 time_diff)
+{
+	/* Update overall statistics */
+	kvm->total_count++;
+	kvm->total_time += time_diff;
+
+	if (vcpu_id == -1) {
+		kvm_update_event_stats(&event->total, time_diff);
+		return true;
+	}
+
+	if (!kvm_event_expand(event, vcpu_id))
+		return false;
+
+	kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
+	return true;
+}
+
+static bool is_child_event(struct perf_kvm_stat *kvm,
+			   struct evsel *evsel,
+			   struct perf_sample *sample,
+			   struct event_key *key)
+{
+	struct child_event_ops *child_ops;
+
+	child_ops = kvm->events_ops->child_ops;
+
+	if (!child_ops)
+		return false;
+
+	for (; child_ops->name; child_ops++) {
+		if (evsel__name_is(evsel, child_ops->name)) {
+			child_ops->get_key(evsel, sample, key);
+			return true;
+		}
+	}
+
+	return false;
+}
+
+static bool handle_child_event(struct perf_kvm_stat *kvm,
+			       struct vcpu_event_record *vcpu_record,
+			       struct event_key *key,
+			       struct perf_sample *sample)
+{
+	struct kvm_event *event = NULL;
+
+	if (key->key != INVALID_KEY)
+		event = find_create_kvm_event(kvm, key, sample);
+
+	vcpu_record->last_event = event;
+
+	return true;
+}
+
+static bool skip_event(const char *event)
+{
+	const char * const *skip_events;
+
+	for (skip_events = kvm_skip_events; *skip_events; skip_events++)
+		if (!strcmp(event, *skip_events))
+			return true;
+
+	return false;
+}
+
+static bool handle_end_event(struct perf_kvm_stat *kvm,
+			     struct vcpu_event_record *vcpu_record,
+			     struct event_key *key,
+			     struct perf_sample *sample)
+{
+	struct kvm_event *event;
+	u64 time_begin, time_diff;
+	int vcpu;
+
+	if (kvm->trace_vcpu == -1)
+		vcpu = -1;
+	else
+		vcpu = vcpu_record->vcpu_id;
+
+	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, sample);
+
+	if (!event)
+		return false;
+
+	vcpu_record->last_event = NULL;
+	vcpu_record->start_time = 0;
+
+	/* seems to happen once in a while during live mode */
+	if (sample->time < time_begin) {
+		pr_debug("End time before begin time; skipping event.\n");
+		return true;
+	}
+
+	time_diff = sample->time - time_begin;
+
+	if (kvm->duration && time_diff > kvm->duration) {
+		char decode[KVM_EVENT_NAME_LEN];
+
+		kvm->events_ops->decode_key(kvm, &event->key, decode);
+		if (!skip_event(decode)) {
+			pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
+				 sample->time, sample->pid, vcpu_record->vcpu_id,
+				 decode, time_diff / NSEC_PER_USEC);
+		}
+	}
+
+	return update_kvm_event(kvm, event, vcpu, time_diff);
+}
+
+static
+struct vcpu_event_record *per_vcpu_record(struct thread *thread,
+					  struct evsel *evsel,
+					  struct perf_sample *sample)
+{
+	/* Only kvm_entry records vcpu id. */
+	if (!thread__priv(thread) && 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 = evsel__intval(evsel, sample, vcpu_id_str);
+		thread__set_priv(thread, vcpu_record);
+	}
+
+	return thread__priv(thread);
+}
+
+static bool handle_kvm_event(struct perf_kvm_stat *kvm,
+			     struct thread *thread,
+			     struct evsel *evsel,
+			     struct perf_sample *sample)
+{
+	struct vcpu_event_record *vcpu_record;
+	struct event_key key = { .key = INVALID_KEY,
+				 .exit_reasons = kvm->exit_reasons };
+
+	vcpu_record = per_vcpu_record(thread, evsel, sample);
+	if (!vcpu_record)
+		return true;
+
+	/* only process events for vcpus user cares about */
+	if ((kvm->trace_vcpu != -1) &&
+	    (kvm->trace_vcpu != vcpu_record->vcpu_id))
+		return true;
+
+	if (kvm->events_ops->is_begin_event(evsel, sample, &key))
+		return handle_begin_event(kvm, vcpu_record, &key, sample);
+
+	if (is_child_event(kvm, evsel, sample, &key))
+		return handle_child_event(kvm, vcpu_record, &key, sample);
+
+	if (kvm->events_ops->is_end_event(evsel, sample, &key))
+		return handle_end_event(kvm, vcpu_record, &key, sample);
+
+	return true;
+}
+
+static bool is_valid_key(struct perf_kvm_stat *kvm)
+{
+	static const char *key_array[] = {
+		"ev_name", "sample", "time", "max_t", "min_t", "mean_t",
+	};
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(key_array); i++)
+		if (!strcmp(key_array[i], kvm->sort_key))
+			return true;
+
+	pr_err("Unsupported sort key: %s\n", kvm->sort_key);
+	return false;
+}
+
+static bool event_is_valid(struct kvm_event *event, int vcpu)
+{
+	return !!get_event_count(event, vcpu);
+}
+
+static int filter_cb(struct hist_entry *he, void *arg __maybe_unused)
+{
+	struct kvm_event *event;
+	struct perf_kvm_stat *perf_kvm;
+
+	event = container_of(he, struct kvm_event, he);
+	perf_kvm = event->perf_kvm;
+	if (!event_is_valid(event, perf_kvm->trace_vcpu))
+		he->filtered = 1;
+	else
+		he->filtered = 0;
+	return 0;
+}
+
+static void sort_result(struct perf_kvm_stat *kvm)
+{
+	struct ui_progress prog;
+	const char *output_columns = "ev_name,sample,percent_sample,"
+				     "time,percent_time,max_t,min_t,mean_t";
+
+	kvm_hists__reinit(output_columns, kvm->sort_key);
+	ui_progress__init(&prog, kvm_hists.hists.nr_entries, "Sorting...");
+	hists__collapse_resort(&kvm_hists.hists, NULL);
+	hists__output_resort_cb(&kvm_hists.hists, NULL, filter_cb);
+	ui_progress__finish();
+}
+
+static void print_vcpu_info(struct perf_kvm_stat *kvm)
+{
+	int vcpu = kvm->trace_vcpu;
+
+	pr_info("Analyze events for ");
+
+	if (kvm->opts.target.system_wide)
+		pr_info("all VMs, ");
+	else if (kvm->opts.target.pid)
+		pr_info("pid(s) %s, ", kvm->opts.target.pid);
+	else
+		pr_info("dazed and confused on what is monitored, ");
+
+	if (vcpu == -1)
+		pr_info("all VCPUs:\n\n");
+	else
+		pr_info("VCPU %d:\n\n", vcpu);
+}
+
+static void show_timeofday(void)
+{
+	char date[64];
+	struct timeval tv;
+	struct tm ltime;
+
+	gettimeofday(&tv, NULL);
+	if (localtime_r(&tv.tv_sec, &ltime)) {
+		strftime(date, sizeof(date), "%H:%M:%S", &ltime);
+		pr_info("%s.%06ld", date, tv.tv_usec);
+	} else
+		pr_info("00:00:00.000000");
+
+	return;
+}
+
+static void print_result(struct perf_kvm_stat *kvm)
+{
+	char decode[KVM_EVENT_NAME_LEN];
+	struct kvm_event *event;
+	int vcpu = kvm->trace_vcpu;
+	struct rb_node *nd;
+
+	if (kvm->live) {
+		puts(CONSOLE_CLEAR);
+		show_timeofday();
+	}
+
+	pr_info("\n\n");
+	print_vcpu_info(kvm);
+	pr_info("%*s ", KVM_EVENT_NAME_LEN, kvm->events_ops->name);
+	pr_info("%10s ", "Samples");
+	pr_info("%9s ", "Samples%");
+
+	pr_info("%9s ", "Time%");
+	pr_info("%11s ", "Min Time");
+	pr_info("%11s ", "Max Time");
+	pr_info("%16s ", "Avg time");
+	pr_info("\n\n");
+
+	for (nd = rb_first_cached(&kvm_hists.hists.entries); nd; nd = rb_next(nd)) {
+		struct hist_entry *he;
+		u64 ecount, etime, max, min;
+
+		he = rb_entry(nd, struct hist_entry, rb_node);
+		if (he->filtered)
+			continue;
+
+		event = container_of(he, struct kvm_event, he);
+		ecount = get_event_count(event, vcpu);
+		etime = get_event_time(event, vcpu);
+		max = get_event_max(event, vcpu);
+		min = get_event_min(event, vcpu);
+
+		kvm->events_ops->decode_key(kvm, &event->key, decode);
+		pr_info("%*s ", KVM_EVENT_NAME_LEN, 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 ", (double)min / NSEC_PER_USEC);
+		pr_info("%9.2fus ", (double)max / NSEC_PER_USEC);
+		pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount / NSEC_PER_USEC,
+			kvm_event_rel_stddev(vcpu, event));
+		pr_info("\n");
+	}
+
+	pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n",
+		kvm->total_count, kvm->total_time / (double)NSEC_PER_USEC);
+
+	if (kvm->lost_events)
+		pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events);
+}
+
+#if defined(HAVE_TIMERFD_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
+static int process_lost_event(struct perf_tool *tool,
+			      union perf_event *event __maybe_unused,
+			      struct perf_sample *sample __maybe_unused,
+			      struct machine *machine __maybe_unused)
+{
+	struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, tool);
+
+	kvm->lost_events++;
+	return 0;
+}
+#endif
+
+static bool skip_sample(struct perf_kvm_stat *kvm,
+			struct perf_sample *sample)
+{
+	if (kvm->pid_list && intlist__find(kvm->pid_list, sample->pid) == NULL)
+		return true;
+
+	return false;
+}
+
+static int process_sample_event(struct perf_tool *tool,
+				union perf_event *event,
+				struct perf_sample *sample,
+				struct evsel *evsel,
+				struct machine *machine)
+{
+	int err = 0;
+	struct thread *thread;
+	struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat,
+						 tool);
+
+	if (skip_sample(kvm, sample))
+		return 0;
+
+	if (machine__resolve(machine, &kvm->al, sample) < 0) {
+		pr_warning("Fail to resolve address location, skip sample.\n");
+		return 0;
+	}
+
+	thread = machine__findnew_thread(machine, sample->pid, sample->tid);
+	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))
+		err = -1;
+
+	thread__put(thread);
+	return err;
+}
+
+static int cpu_isa_config(struct perf_kvm_stat *kvm)
+{
+	char buf[128], *cpuid;
+	int err;
+
+	if (kvm->live) {
+		err = get_cpuid(buf, sizeof(buf));
+		if (err != 0) {
+			pr_err("Failed to look up CPU type: %s\n",
+			       str_error_r(err, buf, sizeof(buf)));
+			return -err;
+		}
+		cpuid = buf;
+	} else
+		cpuid = kvm->session->header.env.cpuid;
+
+	if (!cpuid) {
+		pr_err("Failed to look up CPU type\n");
+		return -EINVAL;
+	}
+
+	err = cpu_isa_init(kvm, cpuid);
+	if (err == -ENOTSUP)
+		pr_err("CPU %s is not supported.\n", cpuid);
+
+	return err;
+}
+
+static bool verify_vcpu(int vcpu)
+{
+	if (vcpu != -1 && vcpu < 0) {
+		pr_err("Invalid vcpu:%d.\n", vcpu);
+		return false;
+	}
+
+	return true;
+}
+
+#if defined(HAVE_TIMERFD_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
+/* keeping the max events to a modest level to keep
+ * the processing of samples per mmap smooth.
+ */
+#define PERF_KVM__MAX_EVENTS_PER_MMAP  25
+
+static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
+				   u64 *mmap_time)
+{
+	struct evlist *evlist = kvm->evlist;
+	union perf_event *event;
+	struct mmap *md;
+	u64 timestamp;
+	s64 n = 0;
+	int err;
+
+	*mmap_time = ULLONG_MAX;
+	md = &evlist->mmap[idx];
+	err = perf_mmap__read_init(&md->core);
+	if (err < 0)
+		return (err == -EAGAIN) ? 0 : -1;
+
+	while ((event = perf_mmap__read_event(&md->core)) != NULL) {
+		err = evlist__parse_sample_timestamp(evlist, event, &timestamp);
+		if (err) {
+			perf_mmap__consume(&md->core);
+			pr_err("Failed to parse sample\n");
+			return -1;
+		}
+
+		err = perf_session__queue_event(kvm->session, event, timestamp, 0, NULL);
+		/*
+		 * FIXME: Here we can't consume the event, as perf_session__queue_event will
+		 *        point to it, and it'll get possibly overwritten by the kernel.
+		 */
+		perf_mmap__consume(&md->core);
+
+		if (err) {
+			pr_err("Failed to enqueue sample: %d\n", err);
+			return -1;
+		}
+
+		/* save time stamp of our first sample for this mmap */
+		if (n == 0)
+			*mmap_time = timestamp;
+
+		/* limit events per mmap handled all at once */
+		n++;
+		if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
+			break;
+	}
+
+	perf_mmap__read_done(&md->core);
+	return n;
+}
+
+static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm)
+{
+	int i, err, throttled = 0;
+	s64 n, ntotal = 0;
+	u64 flush_time = ULLONG_MAX, mmap_time;
+
+	for (i = 0; i < kvm->evlist->core.nr_mmaps; i++) {
+		n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time);
+		if (n < 0)
+			return -1;
+
+		/* flush time is going to be the minimum of all the individual
+		 * mmap times. Essentially, we flush all the samples queued up
+		 * from the last pass under our minimal start time -- that leaves
+		 * a very small race for samples to come in with a lower timestamp.
+		 * The ioctl to return the perf_clock timestamp should close the
+		 * race entirely.
+		 */
+		if (mmap_time < flush_time)
+			flush_time = mmap_time;
+
+		ntotal += n;
+		if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
+			throttled = 1;
+	}
+
+	/* flush queue after each round in which we processed events */
+	if (ntotal) {
+		struct ordered_events *oe = &kvm->session->ordered_events;
+
+		oe->next_flush = flush_time;
+		err = ordered_events__flush(oe, OE_FLUSH__ROUND);
+		if (err) {
+			if (kvm->lost_events)
+				pr_info("\nLost events: %" PRIu64 "\n\n",
+					kvm->lost_events);
+			return err;
+		}
+	}
+
+	return throttled;
+}
+
+static volatile int done;
+
+static void sig_handler(int sig __maybe_unused)
+{
+	done = 1;
+}
+
+static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm)
+{
+	struct itimerspec new_value;
+	int rc = -1;
+
+	kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
+	if (kvm->timerfd < 0) {
+		pr_err("timerfd_create failed\n");
+		goto out;
+	}
+
+	new_value.it_value.tv_sec = kvm->display_time;
+	new_value.it_value.tv_nsec = 0;
+	new_value.it_interval.tv_sec = kvm->display_time;
+	new_value.it_interval.tv_nsec = 0;
+
+	if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) {
+		pr_err("timerfd_settime failed: %d\n", errno);
+		close(kvm->timerfd);
+		goto out;
+	}
+
+	rc = 0;
+out:
+	return rc;
+}
+
+static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
+{
+	uint64_t c;
+	int rc;
+
+	rc = read(kvm->timerfd, &c, sizeof(uint64_t));
+	if (rc < 0) {
+		if (errno == EAGAIN)
+			return 0;
+
+		pr_err("Failed to read timer fd: %d\n", errno);
+		return -1;
+	}
+
+	if (rc != sizeof(uint64_t)) {
+		pr_err("Error reading timer fd - invalid size returned\n");
+		return -1;
+	}
+
+	if (c != 1)
+		pr_debug("Missed timer beats: %" PRIu64 "\n", c-1);
+
+	/* update display */
+	sort_result(kvm);
+	print_result(kvm);
+
+	/* Reset sort list to "ev_name" */
+	kvm_hists__reinit(NULL, "ev_name");
+
+	/* reset counts */
+	clear_events_cache_stats();
+	kvm->total_count = 0;
+	kvm->total_time = 0;
+	kvm->lost_events = 0;
+
+	return 0;
+}
+
+static int fd_set_nonblock(int fd)
+{
+	long arg = 0;
+
+	arg = fcntl(fd, F_GETFL);
+	if (arg < 0) {
+		pr_err("Failed to get current flags for fd %d\n", fd);
+		return -1;
+	}
+
+	if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) {
+		pr_err("Failed to set non-block option on fd %d\n", fd);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int perf_kvm__handle_stdin(void)
+{
+	int c;
+
+	c = getc(stdin);
+	if (c == 'q')
+		return 1;
+
+	return 0;
+}
+
+static int kvm_events_live_report(struct perf_kvm_stat *kvm)
+{
+	int nr_stdin, ret, err = -EINVAL;
+	struct termios save;
+
+	/* live flag must be set first */
+	kvm->live = true;
+
+	ret = cpu_isa_config(kvm);
+	if (ret < 0)
+		return ret;
+
+	if (!verify_vcpu(kvm->trace_vcpu) ||
+	    !is_valid_key(kvm) ||
+	    !register_kvm_events_ops(kvm)) {
+		goto out;
+	}
+
+	set_term_quiet_input(&save);
+
+	kvm_hists__init();
+
+	signal(SIGINT, sig_handler);
+	signal(SIGTERM, sig_handler);
+
+	/* add timer fd */
+	if (perf_kvm__timerfd_create(kvm) < 0) {
+		err = -1;
+		goto out;
+	}
+
+	if (evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
+		goto out;
+
+	nr_stdin = evlist__add_pollfd(kvm->evlist, fileno(stdin));
+	if (nr_stdin < 0)
+		goto out;
+
+	if (fd_set_nonblock(fileno(stdin)) != 0)
+		goto out;
+
+	/* everything is good - enable the events and process */
+	evlist__enable(kvm->evlist);
+
+	while (!done) {
+		struct fdarray *fda = &kvm->evlist->core.pollfd;
+		int rc;
+
+		rc = perf_kvm__mmap_read(kvm);
+		if (rc < 0)
+			break;
+
+		err = perf_kvm__handle_timerfd(kvm);
+		if (err)
+			goto out;
+
+		if (fda->entries[nr_stdin].revents & POLLIN)
+			done = perf_kvm__handle_stdin();
+
+		if (!rc && !done)
+			err = evlist__poll(kvm->evlist, 100);
+	}
+
+	evlist__disable(kvm->evlist);
+
+	if (err == 0) {
+		sort_result(kvm);
+		print_result(kvm);
+	}
+
+out:
+	hists__delete_entries(&kvm_hists.hists);
+
+	if (kvm->timerfd >= 0)
+		close(kvm->timerfd);
+
+	tcsetattr(0, TCSAFLUSH, &save);
+	return err;
+}
+
+static int kvm_live_open_events(struct perf_kvm_stat *kvm)
+{
+	int err, rc = -1;
+	struct evsel *pos;
+	struct evlist *evlist = kvm->evlist;
+	char sbuf[STRERR_BUFSIZE];
+
+	evlist__config(evlist, &kvm->opts, NULL);
+
+	/*
+	 * Note: exclude_{guest,host} do not apply here.
+	 *       This command processes KVM tracepoints from host only
+	 */
+	evlist__for_each_entry(evlist, pos) {
+		struct perf_event_attr *attr = &pos->core.attr;
+
+		/* make sure these *are* set */
+		evsel__set_sample_bit(pos, TID);
+		evsel__set_sample_bit(pos, TIME);
+		evsel__set_sample_bit(pos, CPU);
+		evsel__set_sample_bit(pos, RAW);
+		/* make sure these are *not*; want as small a sample as possible */
+		evsel__reset_sample_bit(pos, PERIOD);
+		evsel__reset_sample_bit(pos, IP);
+		evsel__reset_sample_bit(pos, CALLCHAIN);
+		evsel__reset_sample_bit(pos, ADDR);
+		evsel__reset_sample_bit(pos, READ);
+		attr->mmap = 0;
+		attr->comm = 0;
+		attr->task = 0;
+
+		attr->sample_period = 1;
+
+		attr->watermark = 0;
+		attr->wakeup_events = 1000;
+
+		/* will enable all once we are ready */
+		attr->disabled = 1;
+	}
+
+	err = evlist__open(evlist);
+	if (err < 0) {
+		printf("Couldn't create the events: %s\n",
+		       str_error_r(errno, sbuf, sizeof(sbuf)));
+		goto out;
+	}
+
+	if (evlist__mmap(evlist, kvm->opts.mmap_pages) < 0) {
+		ui__error("Failed to mmap the events: %s\n",
+			  str_error_r(errno, sbuf, sizeof(sbuf)));
+		evlist__close(evlist);
+		goto out;
+	}
+
+	rc = 0;
+
+out:
+	return rc;
+}
+#endif
+
+static int read_events(struct perf_kvm_stat *kvm)
+{
+	int ret;
+
+	struct perf_tool eops = {
+		.sample			= process_sample_event,
+		.comm			= perf_event__process_comm,
+		.namespaces		= perf_event__process_namespaces,
+		.ordered_events		= true,
+	};
+	struct perf_data file = {
+		.path  = kvm->file_name,
+		.mode  = PERF_DATA_MODE_READ,
+		.force = kvm->force,
+	};
+
+	kvm->tool = eops;
+	kvm->session = perf_session__new(&file, &kvm->tool);
+	if (IS_ERR(kvm->session)) {
+		pr_err("Initializing perf session failed\n");
+		return PTR_ERR(kvm->session);
+	}
+
+	symbol__init(&kvm->session->header.env);
+
+	if (!perf_session__has_traces(kvm->session, "kvm record")) {
+		ret = -EINVAL;
+		goto out_delete;
+	}
+
+	/*
+	 * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
+	 * traced in the old kernel.
+	 */
+	ret = cpu_isa_config(kvm);
+	if (ret < 0)
+		goto out_delete;
+
+	ret = perf_session__process_events(kvm->session);
+
+out_delete:
+	perf_session__delete(kvm->session);
+	return ret;
+}
+
+static int parse_target_str(struct perf_kvm_stat *kvm)
+{
+	if (kvm->opts.target.pid) {
+		kvm->pid_list = intlist__new(kvm->opts.target.pid);
+		if (kvm->pid_list == NULL) {
+			pr_err("Error parsing process id string\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
+static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
+{
+	int ret = -EINVAL;
+	int vcpu = kvm->trace_vcpu;
+
+	if (parse_target_str(kvm) != 0)
+		goto exit;
+
+	if (!verify_vcpu(vcpu))
+		goto exit;
+
+	if (!is_valid_key(kvm))
+		goto exit;
+
+	if (!register_kvm_events_ops(kvm))
+		goto exit;
+
+	if (kvm->use_stdio) {
+		use_browser = 0;
+		setup_pager();
+	} else {
+		use_browser = 1;
+	}
+
+	setup_browser(false);
+
+	kvm_hists__init();
+
+	ret = read_events(kvm);
+	if (ret)
+		goto exit;
+
+	sort_result(kvm);
+	kvm_display(kvm);
+
+exit:
+	hists__delete_entries(&kvm_hists.hists);
+	return ret;
+}
+
+#define STRDUP_FAIL_EXIT(s)		\
+	({	char *_p;		\
+	_p = strdup(s);		\
+		if (!_p)		\
+			return -ENOMEM;	\
+		_p;			\
+	})
+
+int __weak setup_kvm_events_tp(struct perf_kvm_stat *kvm __maybe_unused)
+{
+	return 0;
+}
+
+static int
+kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
+{
+	unsigned int rec_argc, i, j, events_tp_size;
+	const char **rec_argv;
+	const char * const record_args[] = {
+		"record",
+		"-R",
+		"-m", "1024",
+		"-c", "1",
+	};
+	const char * const kvm_stat_record_usage[] = {
+		"perf kvm stat record [<options>]",
+		NULL
+	};
+	const char * const *events_tp;
+	int ret;
+
+	events_tp_size = 0;
+	ret = setup_kvm_events_tp(kvm);
+	if (ret < 0) {
+		pr_err("Unable to setup the kvm tracepoints\n");
+		return ret;
+	}
+
+	for (events_tp = kvm_events_tp; *events_tp; events_tp++)
+		events_tp_size++;
+
+	rec_argc = ARRAY_SIZE(record_args) + argc + 2 +
+		   2 * events_tp_size;
+	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]);
+
+	for (j = 0; j < events_tp_size; j++) {
+		rec_argv[i++] = "-e";
+		rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]);
+	}
+
+	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];
+
+	set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
+	set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
+	set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);
+
+	set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
+	set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
+
+	record_usage = kvm_stat_record_usage;
+	return cmd_record(i, rec_argv);
+}
+
+static int
+kvm_events_report(struct perf_kvm_stat *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 (x86 only), ioport (x86 only)"),
+		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_STRING('p', "pid", &kvm->opts.target.pid, "pid",
+			   "analyze events only for given process id(s)"),
+		OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"),
+		OPT_BOOLEAN(0, "stdio", &kvm->use_stdio, "use the stdio interface"),
+		OPT_END()
+	};
+
+	const char * const kvm_events_report_usage[] = {
+		"perf kvm stat report [<options>]",
+		NULL
+	};
+
+	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);
+	}
+
+#ifndef HAVE_SLANG_SUPPORT
+	kvm->use_stdio = true;
+#endif
+
+	if (!kvm->opts.target.pid)
+		kvm->opts.target.system_wide = true;
+
+	return kvm_events_report_vcpu(kvm);
+}
+
+#if defined(HAVE_TIMERFD_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
+static struct evlist *kvm_live_event_list(void)
+{
+	struct evlist *evlist;
+	char *tp, *name, *sys;
+	int err = -1;
+	const char * const *events_tp;
+
+	evlist = evlist__new();
+	if (evlist == NULL)
+		return NULL;
+
+	for (events_tp = kvm_events_tp; *events_tp; events_tp++) {
+
+		tp = strdup(*events_tp);
+		if (tp == NULL)
+			goto out;
+
+		/* split tracepoint into subsystem and name */
+		sys = tp;
+		name = strchr(tp, ':');
+		if (name == NULL) {
+			pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n",
+			       *events_tp);
+			free(tp);
+			goto out;
+		}
+		*name = '\0';
+		name++;
+
+		if (evlist__add_newtp(evlist, sys, name, NULL)) {
+			pr_err("Failed to add %s tracepoint to the list\n", *events_tp);
+			free(tp);
+			goto out;
+		}
+
+		free(tp);
+	}
+
+	err = 0;
+
+out:
+	if (err) {
+		evlist__delete(evlist);
+		evlist = NULL;
+	}
+
+	return evlist;
+}
+
+static int kvm_events_live(struct perf_kvm_stat *kvm,
+			   int argc, const char **argv)
+{
+	char errbuf[BUFSIZ];
+	int err;
+
+	const struct option live_options[] = {
+		OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
+			"record events on existing process id"),
+		OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
+			"number of mmap data pages", evlist__parse_mmap_pages),
+		OPT_INCR('v', "verbose", &verbose,
+			"be more verbose (show counter open errors, etc)"),
+		OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
+			"system-wide collection from all CPUs"),
+		OPT_UINTEGER('d', "display", &kvm->display_time,
+			"time in seconds between display updates"),
+		OPT_STRING(0, "event", &kvm->report_event, "report event",
+			"event for reporting: "
+			"vmexit, mmio (x86 only), ioport (x86 only)"),
+		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_U64(0, "duration", &kvm->duration,
+			"show events other than"
+			" HLT (x86 only) or Wait state (s390 only)"
+			" that take longer than duration usecs"),
+		OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
+				"per thread proc mmap processing timeout in ms"),
+		OPT_END()
+	};
+	const char * const live_usage[] = {
+		"perf kvm stat live [<options>]",
+		NULL
+	};
+	struct perf_data data = {
+		.mode = PERF_DATA_MODE_WRITE,
+	};
+
+
+	/* event handling */
+	kvm->tool.sample = process_sample_event;
+	kvm->tool.comm   = perf_event__process_comm;
+	kvm->tool.exit   = perf_event__process_exit;
+	kvm->tool.fork   = perf_event__process_fork;
+	kvm->tool.lost   = process_lost_event;
+	kvm->tool.namespaces  = perf_event__process_namespaces;
+	kvm->tool.ordered_events = true;
+	perf_tool__fill_defaults(&kvm->tool);
+
+	/* set defaults */
+	kvm->display_time = 1;
+	kvm->opts.user_interval = 1;
+	kvm->opts.mmap_pages = 512;
+	kvm->opts.target.uses_mmap = false;
+	kvm->opts.target.uid_str = NULL;
+	kvm->opts.target.uid = UINT_MAX;
+
+	symbol__init(NULL);
+	disable_buildid_cache();
+
+	use_browser = 0;
+
+	if (argc) {
+		argc = parse_options(argc, argv, live_options,
+				     live_usage, 0);
+		if (argc)
+			usage_with_options(live_usage, live_options);
+	}
+
+	kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */
+
+	/*
+	 * target related setups
+	 */
+	err = target__validate(&kvm->opts.target);
+	if (err) {
+		target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ);
+		ui__warning("%s", errbuf);
+	}
+
+	if (target__none(&kvm->opts.target))
+		kvm->opts.target.system_wide = true;
+
+
+	/*
+	 * generate the event list
+	 */
+	err = setup_kvm_events_tp(kvm);
+	if (err < 0) {
+		pr_err("Unable to setup the kvm tracepoints\n");
+		return err;
+	}
+
+	kvm->evlist = kvm_live_event_list();
+	if (kvm->evlist == NULL) {
+		err = -1;
+		goto out;
+	}
+
+	if (evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0)
+		usage_with_options(live_usage, live_options);
+
+	/*
+	 * perf session
+	 */
+	kvm->session = perf_session__new(&data, &kvm->tool);
+	if (IS_ERR(kvm->session)) {
+		err = PTR_ERR(kvm->session);
+		goto out;
+	}
+	kvm->session->evlist = kvm->evlist;
+	perf_session__set_id_hdr_size(kvm->session);
+	ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
+	machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
+				    kvm->evlist->core.threads, true, false, 1);
+	err = kvm_live_open_events(kvm);
+	if (err)
+		goto out;
+
+	err = kvm_events_live_report(kvm);
+
+out:
+	perf_session__delete(kvm->session);
+	kvm->session = NULL;
+	evlist__delete(kvm->evlist);
+
+	return err;
+}
+#endif
+
+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("\tlive:   live reporting of statistical data of kvm events\n");
+
+	printf("\nOtherwise, it is the alias of 'perf stat':\n");
+}
+
+static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
+{
+	struct perf_kvm_stat kvm = {
+		.file_name = file_name,
+
+		.trace_vcpu	= -1,
+		.report_event	= "vmexit",
+		.sort_key	= "sample",
+
+	};
+
+	if (argc == 1) {
+		print_kvm_stat_usage();
+		goto perf_stat;
+	}
+
+	if (strlen(argv[1]) > 2 && strstarts("record", argv[1]))
+		return kvm_events_record(&kvm, argc - 1, argv + 1);
+
+	if (strlen(argv[1]) > 2 && strstarts("report", argv[1]))
+		return kvm_events_report(&kvm, argc - 1 , argv + 1);
+
+#if defined(HAVE_TIMERFD_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
+	if (!strncmp(argv[1], "live", 4))
+		return kvm_events_live(&kvm, argc - 1 , argv + 1);
+#endif
+
+perf_stat:
+	return cmd_stat(argc, argv);
+}
+#endif /* HAVE_KVM_STAT_SUPPORT */
+
+int __weak kvm_add_default_arch_event(int *argc __maybe_unused,
+					const char **argv __maybe_unused)
+{
+	return 0;
+}
+
+static int __cmd_record(const char *file_name, int argc, const char **argv)
+{
+	int rec_argc, i = 0, j, ret;
+	const char **rec_argv;
+
+	ret = kvm_add_default_arch_event(&argc, argv);
+	if (ret)
+		return -EINVAL;
+
+	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(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);
+}
+
+static int __cmd_report(const char *file_name, 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(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);
+}
+
+static int
+__cmd_buildid_list(const char *file_name, 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(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);
+}
+
+int cmd_kvm(int argc, const char **argv)
+{
+	const char *file_name = NULL;
+	const struct option kvm_options[] = {
+		OPT_STRING('i', "input", &file_name, "file",
+			   "Input file name"),
+		OPT_STRING('o', "output", &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_BOOLEAN(0, "guest-code", &symbol_conf.guest_code,
+			    "Guest code can be found in hypervisor process"),
+		OPT_INCR('v', "verbose", &verbose,
+			    "be more verbose (show counter open errors, etc)"),
+		OPT_END()
+	};
+
+	const char *const kvm_subcommands[] = { "top", "record", "report", "diff",
+						"buildid-list", "stat", NULL };
+	const char *kvm_usage[] = { NULL, NULL };
+
+	perf_host  = 0;
+	perf_guest = 1;
+
+	argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, kvm_usage,
+					PARSE_OPT_STOP_AT_NON_OPTION);
+	if (!argc)
+		usage_with_options(kvm_usage, kvm_options);
+
+	if (!perf_host)
+		perf_guest = 1;
+
+	if (!file_name) {
+		file_name = get_filename_for_perf_kvm();
+
+		if (!file_name) {
+			pr_err("Failed to allocate memory for filename\n");
+			return -ENOMEM;
+		}
+	}
+
+	if (strlen(argv[0]) > 2 && strstarts("record", argv[0]))
+		return __cmd_record(file_name, argc, argv);
+	else if (strlen(argv[0]) > 2 && strstarts("report", argv[0]))
+		return __cmd_report(file_name, argc, argv);
+	else if (strlen(argv[0]) > 2 && strstarts("diff", argv[0]))
+		return cmd_diff(argc, argv);
+	else if (!strcmp(argv[0], "top"))
+		return cmd_top(argc, argv);
+	else if (strlen(argv[0]) > 2 && strstarts("buildid-list", argv[0]))
+		return __cmd_buildid_list(file_name, argc, argv);
+#if defined(HAVE_KVM_STAT_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
+	else if (strlen(argv[0]) > 2 && strstarts("stat", argv[0]))
+		return kvm_cmd_stat(file_name, argc, argv);
+#endif
+	else
+		usage_with_options(kvm_usage, kvm_options);
+
+	return 0;
+}