plugins: Iterate on cb_lists in qemu_plugin_user_exit

Rather than iterate over all plugins for all events,
iterate over plugins that have registered a given event.

Signed-off-by: Richard Henderson <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Signed-off-by: Alex Bennée <[email protected]>
Message-Id: <[email protected]>

Author: rth7680

plugins/core.c

@@ -514,9 +514,10 @@ void qemu_plugin_user_exit(void)
     /* un-register all callbacks except the final AT_EXIT one */
     for (ev = 0; ev < QEMU_PLUGIN_EV_MAX; ev++) {
         if (ev != QEMU_PLUGIN_EV_ATEXIT) {
-            struct qemu_plugin_ctx *ctx;
-            QTAILQ_FOREACH(ctx, &plugin.ctxs, entry) {
-                plugin_unregister_cb__locked(ctx, ev);
+            struct qemu_plugin_cb *cb, *next;
+
+            QLIST_FOREACH_SAFE_RCU(cb, &plugin.cb_lists[ev], entry, next) {
+                plugin_unregister_cb__locked(cb->ctx, ev);
             }
         }
     }