[Xen-changelog] [xen-3.4-testing] x86: fix guest reads of CR4.

["Xen patchbot-3.4-testing" <patchbot-3.4-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1259310828 0
# Node ID 7c0c26abbf2824fcf5f4096f011b1c24409ac21a
# Parent  1d30a3d836ed8e2a108f9b48fb18142d589bfbc9
x86: fix guest reads of CR4.

Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
xen-unstable changeset:   20506:8a0f156487b0
xen-unstable date:        Thu Nov 26 11:24:50 2009 +0000
---
 xen/arch/x86/traps.c |    7 +------
 1 files changed, 1 insertion(+), 6 deletions(-)

diff -r 1d30a3d836ed -r 7c0c26abbf28 xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c      Fri Nov 27 08:31:16 2009 +0000
+++ b/xen/arch/x86/traps.c      Fri Nov 27 08:33:48 2009 +0000
@@ -2029,12 +2029,7 @@ static int emulate_privileged_op(struct 
             break;
 
         case 4: /* Read CR4 */
-            /*
-             * Guests can read CR4 to see what features Xen has enabled. We
-             * therefore lie about PGE and PSE as they are unavailable to
-             * guests.
-             */
-            *reg = read_cr4() & ~(X86_CR4_PGE|X86_CR4_PSE);
+            *reg = v->arch.guest_context.ctrlreg[4];
             break;
 
         default:

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