For leaf classes, in many cases the callbacks will simply downcast the object back to the original class. Add this fast path to object_class_dynamic_cast, object_dynamic_cast will inherit it.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> --- qom/object.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/qom/object.c b/qom/object.c index 35f4694..0aa0c07 100644 --- a/qom/object.c +++ b/qom/object.c @@ -457,7 +457,12 @@ ObjectClass *object_class_dynamic_cast(ObjectClass *class, return NULL; } + /* A simple fast path that can trigger a lot for leaf classes. */ type = class->type; + if (type->name == typename) { + return class; + } + target_type = type_get_by_name(typename); if (!target_type) { /* target class type unknown, so fail the cast */ -- 1.8.1.4