--- zzzz-none-000/linux-3.10.107/include/uapi/xen/privcmd.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/include/uapi/xen/privcmd.h	2021-02-04 17:41:59.000000000 +0000
@@ -44,6 +44,10 @@
 
 struct privcmd_mmap_entry {
 	__u64 va;
+	/*
+	 * This should be a GFN. It's not possible to change the name because
+	 * it's exposed to the user-space.
+	 */
 	__u64 mfn;
 	__u64 npages;
 };