[Xen-changelog] [xen-unstable] nestedsvm: fix checks of guest writes to HSAVE_PA MSR

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Christoph Egger <Christoph.Egger@xxxxxxx>
# Date 1318504870 -3600
# Node ID c1bd53fac3d5e5868352894d62dbacd6de0b0e7a
# Parent  eda18b27de6ed873ceb0e2f633d04236c5479f6d
nestedsvm: fix checks of guest writes to HSAVE_PA MSR

Accessing HSAVE_PA MSR does not require SVM to be enabled nor any
special guest paging mode.
But accessing HSAVE_PA MSR requires the address to be 4k aligned.

Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>
Acked-by: Tim Deegan <tim@xxxxxxx>
Committed-by: Tim Deegan <tim@xxxxxxx>
---


diff -r eda18b27de6e -r c1bd53fac3d5 xen/arch/x86/hvm/svm/nestedsvm.c
--- a/xen/arch/x86/hvm/svm/nestedsvm.c  Thu Oct 13 12:21:10 2011 +0100
+++ b/xen/arch/x86/hvm/svm/nestedsvm.c  Thu Oct 13 12:21:10 2011 +0100
@@ -51,7 +51,8 @@
 static int
 nestedsvm_vmcb_isvalid(struct vcpu *v, uint64_t vmcxaddr)
 {
-    if ( !hvm_svm_enabled(v) || hvm_guest_x86_mode(v) < 2 )
+    /* Address must be 4k aligned */
+    if ( (vmcxaddr & ~PAGE_MASK) != 0 )
         return 0;
 
     /* Maximum valid physical address.

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