diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index ef5795d..f3eebd2 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1947,6 +1947,15 @@
 		}
 	}
 
+#ifdef CONFIG_INTR_REMAP
+	if (!intr_remapping_enabled) {
+		ret = enable_intr_remapping(0);
+		if (ret)
+			printk(KERN_ERR
+			       "IOMMU: enable interrupt remapping failed\n");
+	}
+#endif
+
 	/*
 	 * For each rmrr
 	 *   for each dev attached to rmrr