perf auxtrace: Add machine_pid and vcpu to auxtrace_error

Add machine_pid and vcpu to struct perf_record_auxtrace_error. The existing
fmt member is used to identify the new format.

The new members make it possible to easily differentiate errors from guest
machines.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-18-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/lib/perf/include/perf/event.h

@@ -279,6 +279,8 @@ struct perf_record_auxtrace_error {
 	__u64			 ip;
 	__u64			 time;
 	char			 msg[MAX_AUXTRACE_ERROR_MSG];
+	__u32			 machine_pid;
+	__u32			 vcpu;
 };
 
 struct perf_record_aux {

tools/perf/util/auxtrace.c

@@ -1189,9 +1189,10 @@ void auxtrace_buffer__free(struct auxtrace_buffer *buffer)
 	free(buffer);
 }
 
-void auxtrace_synth_error(struct perf_record_auxtrace_error *auxtrace_error, int type,
-			  int code, int cpu, pid_t pid, pid_t tid, u64 ip,
-			  const char *msg, u64 timestamp)
+void auxtrace_synth_guest_error(struct perf_record_auxtrace_error *auxtrace_error, int type,
+				int code, int cpu, pid_t pid, pid_t tid, u64 ip,
+				const char *msg, u64 timestamp,
+				pid_t machine_pid, int vcpu)
 {
 	size_t size;
 
@@ -1207,12 +1208,26 @@ void auxtrace_synth_error(struct perf_record_auxtrace_error *auxtrace_error, int
 	auxtrace_error->ip = ip;
 	auxtrace_error->time = timestamp;
 	strlcpy(auxtrace_error->msg, msg, MAX_AUXTRACE_ERROR_MSG);
-
-	size = (void *)auxtrace_error->msg - (void *)auxtrace_error +
-	       strlen(auxtrace_error->msg) + 1;
+	if (machine_pid) {
+		auxtrace_error->fmt = 2;
+		auxtrace_error->machine_pid = machine_pid;
+		auxtrace_error->vcpu = vcpu;
+		size = sizeof(*auxtrace_error);
+	} else {
+		size = (void *)auxtrace_error->msg - (void *)auxtrace_error +
+		       strlen(auxtrace_error->msg) + 1;
+	}
 	auxtrace_error->header.size = PERF_ALIGN(size, sizeof(u64));
 }
 
+void auxtrace_synth_error(struct perf_record_auxtrace_error *auxtrace_error, int type,
+			  int code, int cpu, pid_t pid, pid_t tid, u64 ip,
+			  const char *msg, u64 timestamp)
+{
+	auxtrace_synth_guest_error(auxtrace_error, type, code, cpu, pid, tid,
+				   ip, msg, timestamp, 0, -1);
+}
+
 int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
 					 struct perf_tool *tool,
 					 struct perf_session *session,
@@ -1662,6 +1677,9 @@ size_t perf_event__fprintf_auxtrace_error(union perf_event *event, FILE *fp)
 	if (!e->fmt)
 		msg = (const char *)&e->time;
 
+	if (e->fmt >= 2 && e->machine_pid)
+		ret += fprintf(fp, " machine_pid %d vcpu %d", e->machine_pid, e->vcpu);
+
 	ret += fprintf(fp, " cpu %d pid %d tid %d ip %#"PRI_lx64" code %u: %s\n",
 		       e->cpu, e->pid, e->tid, e->ip, e->code, msg);
 	return ret;

tools/perf/util/auxtrace.h

@@ -595,6 +595,10 @@ int auxtrace_index__process(int fd, u64 size, struct perf_session *session,
 			    bool needs_swap);
 void auxtrace_index__free(struct list_head *head);
 
+void auxtrace_synth_guest_error(struct perf_record_auxtrace_error *auxtrace_error, int type,
+				int code, int cpu, pid_t pid, pid_t tid, u64 ip,
+				const char *msg, u64 timestamp,
+				pid_t machine_pid, int vcpu);
 void auxtrace_synth_error(struct perf_record_auxtrace_error *auxtrace_error, int type,
 			  int code, int cpu, pid_t pid, pid_t tid, u64 ip,
 			  const char *msg, u64 timestamp);

tools/perf/util/scripting-engines/trace-event-python.c

@@ -1559,7 +1559,7 @@ static void python_process_auxtrace_error(struct perf_session *session __maybe_u
 		msg = (const char *)&e->time;
 	}
 
-	t = tuple_new(9);
+	t = tuple_new(11);
 
 	tuple_set_u32(t, 0, e->type);
 	tuple_set_u32(t, 1, e->code);
@@ -1570,6 +1570,8 @@ static void python_process_auxtrace_error(struct perf_session *session __maybe_u
 	tuple_set_u64(t, 6, tm);
 	tuple_set_string(t, 7, msg);
 	tuple_set_u32(t, 8, cpumode);
+	tuple_set_s32(t, 9, e->machine_pid);
+	tuple_set_s32(t, 10, e->vcpu);
 
 	call_object(handler, t, handler_name);
 

tools/perf/util/session.c

@@ -895,6 +895,10 @@ static void perf_event__auxtrace_error_swap(union perf_event *event,
 	event->auxtrace_error.ip   = bswap_64(event->auxtrace_error.ip);
 	if (event->auxtrace_error.fmt)
 		event->auxtrace_error.time = bswap_64(event->auxtrace_error.time);
+	if (event->auxtrace_error.fmt >= 2) {
+		event->auxtrace_error.machine_pid = bswap_32(event->auxtrace_error.machine_pid);
+		event->auxtrace_error.vcpu = bswap_32(event->auxtrace_error.vcpu);
+	}
 }
 
 static void perf_event__thread_map_swap(union perf_event *event,