cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kvm-stat.c (2103B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <errno.h>
      3#include <memory.h>
      4#include "../../../util/evsel.h"
      5#include "../../../util/kvm-stat.h"
      6#include "arm64_exception_types.h"
      7#include "debug.h"
      8
      9define_exit_reasons_table(arm64_exit_reasons, kvm_arm_exception_type);
     10define_exit_reasons_table(arm64_trap_exit_reasons, kvm_arm_exception_class);
     11
     12const char *kvm_trap_exit_reason = "esr_ec";
     13const char *vcpu_id_str = "id";
     14const int decode_str_len = 20;
     15const char *kvm_exit_reason = "ret";
     16const char *kvm_entry_trace = "kvm:kvm_entry";
     17const char *kvm_exit_trace = "kvm:kvm_exit";
     18
     19const char *kvm_events_tp[] = {
     20	"kvm:kvm_entry",
     21	"kvm:kvm_exit",
     22	NULL,
     23};
     24
     25static void event_get_key(struct evsel *evsel,
     26			  struct perf_sample *sample,
     27			  struct event_key *key)
     28{
     29	key->info = 0;
     30	key->key = evsel__intval(evsel, sample, kvm_exit_reason);
     31	key->exit_reasons = arm64_exit_reasons;
     32
     33	/*
     34	 * TRAP exceptions carry exception class info in esr_ec field
     35	 * and, hence, we need to use a different exit_reasons table to
     36	 * properly decode event's est_ec.
     37	 */
     38	if (key->key == ARM_EXCEPTION_TRAP) {
     39		key->key = evsel__intval(evsel, sample, kvm_trap_exit_reason);
     40		key->exit_reasons = arm64_trap_exit_reasons;
     41	}
     42}
     43
     44static bool event_begin(struct evsel *evsel,
     45			struct perf_sample *sample __maybe_unused,
     46			struct event_key *key __maybe_unused)
     47{
     48	return !strcmp(evsel->name, kvm_entry_trace);
     49}
     50
     51static bool event_end(struct evsel *evsel,
     52		      struct perf_sample *sample,
     53		      struct event_key *key)
     54{
     55	if (!strcmp(evsel->name, kvm_exit_trace)) {
     56		event_get_key(evsel, sample, key);
     57		return true;
     58	}
     59	return false;
     60}
     61
     62static struct kvm_events_ops exit_events = {
     63	.is_begin_event = event_begin,
     64	.is_end_event	= event_end,
     65	.decode_key	= exit_event_decode_key,
     66	.name		= "VM-EXIT"
     67};
     68
     69struct kvm_reg_events_ops kvm_reg_events_ops[] = {
     70	{
     71		.name	= "vmexit",
     72		.ops	= &exit_events,
     73	},
     74	{ NULL, NULL },
     75};
     76
     77const char * const kvm_skip_events[] = {
     78	NULL,
     79};
     80
     81int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid __maybe_unused)
     82{
     83	kvm->exit_reasons_isa = "arm64";
     84	return 0;
     85}