static void vhost_vdpa_config_put(struct vhost_vdpa *v)
{
	if (v->config_ctx) {
		eventfd_ctx_put(v->config_ctx);
		v->config_ctx = NULL;
	}
}
static void vhost_vdpa_config_put(struct vhost_vdpa *v)
{
	if (v->config_ctx) {
		eventfd_ctx_put(v->config_ctx);
		v->config_ctx = NULL;
	}
}