3 files changed, 37 insertions, 1 deletions
diff --git a/trace/control-target.c b/trace/control-target.c
index 7ebf6e0bcb..e2e138a3f0 100644
--- a/trace/control-target.c
+++ b/trace/control-target.c
@@ -79,7 +79,7 @@ void trace_event_set_vcpu_state_dynamic(CPUState *vcpu,
     }
 }
 
-static bool adding_first_cpu(void)
+static bool adding_first_cpu1(void)
 {
     CPUState *cpu;
     size_t count = 0;
@@ -92,6 +92,15 @@ static bool adding_first_cpu(void)
     return true;
 }
 
+static bool adding_first_cpu(void)
+{
+    bool res;
+    cpu_list_lock();
+    res = adding_first_cpu1();
+    cpu_list_unlock();
+    return res;
+}
+
 void trace_init_vcpu(CPUState *vcpu)
 {
     TraceEventIter iter;
diff --git a/trace/control.c b/trace/control.c
index 1a7bee6ddc..56a2632584 100644
--- a/trace/control.c
+++ b/trace/control.c
@@ -26,6 +26,7 @@
 #include "qemu/error-report.h"
 #include "qemu/config-file.h"
 #include "monitor/monitor.h"
+#include "trace.h"
 
 int trace_events_enabled_count;
 
@@ -259,6 +260,24 @@ void trace_init_file(const char *file)
 #endif
 }
 
+void trace_fini_vcpu(CPUState *vcpu)
+{
+    TraceEventIter iter;
+    TraceEvent *ev;
+
+    trace_guest_cpu_exit(vcpu);
+
+    trace_event_iter_init(&iter, NULL);
+    while ((ev = trace_event_iter_next(&iter)) != NULL) {
+        if (trace_event_is_vcpu(ev) &&
+            trace_event_get_state_static(ev) &&
+            trace_event_get_vcpu_state_dynamic(vcpu, ev)) {
+            /* must disable to affect the global counter */
+            trace_event_set_vcpu_state_dynamic(vcpu, ev, false);
+        }
+    }
+}
+
 bool trace_init_backends(void)
 {
 #ifdef CONFIG_TRACE_SIMPLE
diff --git a/trace/control.h b/trace/control.h
index ccaeac8552..4ea53e2986 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -202,6 +202,14 @@ void trace_init_file(const char *file);
 void trace_init_vcpu(CPUState *vcpu);
 
 /**
+ * trace_fini_vcpu:
+ * @vcpu: Removed vCPU.
+ *
+ * Disable dynamic event state for a hot-unplugged vCPU.
+ */
+void trace_fini_vcpu(CPUState *vcpu);
+
+/**
  * trace_list_events:
  *
  * List all available events.