From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Egger <Christoph.Egger@amd.com>
Subject: [PATCH] nestedsvm: fix paging mode
Date: Fri, 21 Sep 2012 16:01:31 +0200
Message-ID: <505C733B.50205@amd.com>
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="------------090209060906050805000502"
Return-path: <xen-devel-bounces@lists.xen.org>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org

--------------090209060906050805000502
Content-Type: text/plain; charset="ISO-8859-15"
Content-Transfer-Encoding: 7bit


On VMRUN and VMEXIT emulation update the paging mode
for Shadow-on-Nested. This allows Xen to walk the
l1 hypervisors shadow page table correctly.
Problem found with 64bit Win7 and 32bit XPMode where
Win7 switches forth and back between long mode and
PAE legacy pagetables.

Signed-off-by: Christoph Egger <Christoph.Egger@amd.com>

P.S.: Please apply this patch to xen-4.2-testing as well.


-- 
---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Einsteinring 24, 85689 Dornach b. Muenchen
Geschaeftsfuehrer: Alberto Bozzo
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632

--------------090209060906050805000502
Content-Type: text/plain; charset="us-ascii"; name="xen_nh_paging.diff"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="xen_nh_paging.diff"
Content-Description: xen_nh_paging.diff

diff -r ef514a30fd70 xen/arch/x86/hvm/svm/nestedsvm.c
--- a/xen/arch/x86/hvm/svm/nestedsvm.c	Fri Sep 21 13:25:22 2012 +0200
+++ b/xen/arch/x86/hvm/svm/nestedsvm.c	Fri Sep 21 14:44:13 2012 +0200
@@ -745,6 +745,11 @@ nsvm_vcpu_vmrun(struct vcpu *v, struct c
         return 1;
     }
 
+    /* If we use nested paging and l1 guest uses shadow paging ... */
+    if (paging_mode_hap(v->domain) && !nestedhvm_paging_mode_hap(v))
+        /* ... update the paging modes. */
+        paging_update_paging_modes(v);
+
     nv->nv_vmswitch_in_progress = 0;
     return 0;
 }
@@ -1412,6 +1417,11 @@ nestedsvm_vcpu_vmexit(struct vcpu *v, st
      */
     rc = nhvm_vcpu_vmexit(v, regs, exitcode);
 
+    /* If we use nested paging and l1 guest uses shadow paging ... */
+    if (paging_mode_hap(v->domain) && !nestedhvm_paging_mode_hap(v))
+        /* ... update the paging modes. */
+        paging_update_paging_modes(v);
+
     nv->nv_vmswitch_in_progress = 0;
 
     if (rc)

--------------090209060906050805000502
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

--------------090209060906050805000502--