1 files changed, 9 insertions, 0 deletions
diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h
index 14d476c587..2c6307e3ed 100644
--- a/include/hw/qdev-core.h
+++ b/include/hw/qdev-core.h
@@ -3,6 +3,8 @@
 
 #include "qemu/queue.h"
 #include "qemu/bitmap.h"
+#include "qemu/rcu.h"
+#include "qemu/rcu_queue.h"
 #include "qom/object.h"
 #include "hw/hotplug.h"
 #include "hw/resettable.h"
@@ -238,6 +240,7 @@ struct BusClass {
 };
 
 typedef struct BusChild {
+    struct rcu_head rcu;
     DeviceState *child;
     int index;
     QTAILQ_ENTRY(BusChild) sibling;
@@ -258,6 +261,12 @@ struct BusState {
     int max_index;
     bool realized;
     int num_children;
+
+    /*
+     * children is a RCU QTAILQ, thus readers must use RCU to access it,
+     * and writers must hold the big qemu lock
+     */
+
     QTAILQ_HEAD(, BusChild) children;
     QLIST_ENTRY(BusState) sibling;
     ResettableState reset;