--- a/drivers/iommu/intel/iommu.c	2021-05-14 09:50:46.000000000 +0200
+++ b/drivers/iommu/intel/iommu.c	2021-05-16 01:02:17.816810690 +0200
@@ -2373,7 +2373,10 @@ static int __domain_mapping(struct dmar_
 		}
 	}
 
-	pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | attr;
+	if (!sg) {
+                sg_res = nr_pages;
+                pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | attr;
+	}
 
 	while (nr_pages > 0) {
 		uint64_t tmp;