Magento 1.9 - 获取所有包含加售的产品

Magento 1.9 - Get all products that contain upsell

我如何获得所有包含/包含加售产品的产品。

谢谢

        <?php
    $_products = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('id');
    foreach ($_products as $product){
     $_product = Mage::getModel('catalog/product')->load($product);
     if (count($_product->getUpSellProductIds()) > 0) :

echo $_product->getName()." has upsell products.";
   endif; 
 ?>