[Xen-changelog] [xen-3.2-testing] x86: relax restrictions on reserved bits in L3 for 32on64 x86 guests

["Xen patchbot-3.2-testing" <patchbot-3.2-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1225804463 0
# Node ID 5de7bd81da986100cfbc9244563580f928d997b5
# Parent  31ee8af9b515bfe85c20f74804c0198277aa648e
x86: relax restrictions on reserved bits in L3 for 32on64 x86 guests

A 32on64 guest cannot copy an existing pinned L3 entry to use as a new
L3 because COMPAT_L3_DISALLOW_MASK contains bits which are added to L3
entries by adjust_guest_l3e (U/S & R/W) or by the hardware (A & D).

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
xen-unstable changeset:   18714:3ff349c7aeb77a0a66a53dd409751e3574a4742b
xen-unstable date:        Mon Oct 27 10:08:48 2008 +0000
---
 xen/include/asm-x86/x86_64/page.h |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r 31ee8af9b515 -r 5de7bd81da98 xen/include/asm-x86/x86_64/page.h
--- a/xen/include/asm-x86/x86_64/page.h Tue Oct 21 12:10:34 2008 +0100
+++ b/xen/include/asm-x86/x86_64/page.h Tue Nov 04 13:14:23 2008 +0000
@@ -119,7 +119,7 @@ typedef l4_pgentry_t root_pgentry_t;
 #define L3_DISALLOW_MASK (BASE_DISALLOW_MASK)
 #define L4_DISALLOW_MASK (BASE_DISALLOW_MASK)
 
-#define COMPAT_L3_DISALLOW_MASK 0xFFFFF1FEU
+#define COMPAT_L3_DISALLOW_MASK 0xFFFFF198U
 
 #define PAGE_HYPERVISOR         (__PAGE_HYPERVISOR         | _PAGE_GLOBAL)
 #define PAGE_HYPERVISOR_NOCACHE (__PAGE_HYPERVISOR_NOCACHE | _PAGE_GLOBAL)

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