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-rw-r--r--trace/control.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/trace/control.c b/trace/control.c
index f5fb11d280..82d8989c4d 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -65,8 +65,15 @@ void trace_event_register_group(TraceEvent **events)
size_t i;
for (i = 0; events[i] != NULL; i++) {
events[i]->id = next_id++;
- if (events[i]->vcpu_id != TRACE_VCPU_EVENT_NONE) {
+ if (events[i]->vcpu_id == TRACE_VCPU_EVENT_NONE) {
+ continue;
+ }
+
+ if (likely(next_vcpu_id < CPU_TRACE_DSTATE_MAX_EVENTS)) {
events[i]->vcpu_id = next_vcpu_id++;
+ } else {
+ error_report("WARNING: too many vcpu trace events; dropping '%s'",
+ events[i]->name);
}
}
event_groups = g_renew(TraceEventGroup, event_groups, nevent_groups + 1);