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

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1225102128 0
# Node ID 3ff349c7aeb77a0a66a53dd409751e3574a4742b
# Parent  c3362551a424d394b75b420981a3081198509915
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/include/asm-x86/x86_64/page.h |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r c3362551a424 -r 3ff349c7aeb7 xen/include/asm-x86/x86_64/page.h
--- a/xen/include/asm-x86/x86_64/page.h Mon Oct 27 10:06:58 2008 +0000
+++ b/xen/include/asm-x86/x86_64/page.h Mon Oct 27 10:08:48 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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