From a92a5446e2482938e1bce89789235cf814cd85d1 Mon Sep 17 00:00:00 2001
From: Malcolm Crossley <malcolm.crossley@citrix.com>
Date: Mon, 28 Sep 2015 11:36:52 +0100
Subject: [PATCH] x86/xen: Do not clip xen_e820_map to xen_e820_map_entries
 when sanitizing map

commit 64c98e7f49100b637cd20a6c63508caed6bbba7a upstream.

Sanitizing the e820 map may produce extra E820 entries which would result in
the topmost E820 entries being removed. The removed entries would typically
include the top E820 usable RAM region and thus result in the domain having
signicantly less RAM available to it.

Fix by allowing sanitize_e820_map to use the full size of the allocated E820
array.

Signed-off-by: Malcolm Crossley <malcolm.crossley@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
[bwh: Backported to 3.2:
 s/xen_e820_map_entries/memmap.nr_entries/; s/xen_e820_map/map/g]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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