diff -rN -u -p old-xen-64-4/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/dma-mapping.h new-xen-64-4/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/dma-mapping.h
--- old-xen-64-4/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/dma-mapping.h	2005-05-24 17:34:54.000000000 +0000
+++ new-xen-64-4/linux-2.6.11-xen-sparse/include/asm-xen/asm-x86_64/dma-mapping.h	2005-06-03 06:40:04.000000000 +0000
@@ -39,11 +39,11 @@ static inline dma_addr_t dma_map_single(
 
 	if (direction == DMA_NONE)
 		out_of_line_bug();
-	addr = virt_to_phys(ptr);
+	addr = virt_to_machine(ptr);
 
 	if ((addr+size) & ~*hwdev->dma_mask)
 		out_of_line_bug();
-	return phys_to_machine(addr);
+	return addr;
 }