From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marcelo Tosatti <mtosatti@redhat.com>
Subject: KVM: x86: disable paravirt mmu reporting
Date: Thu, 1 Oct 2009 19:28:39 -0300
Message-ID: <20091001222839.GA23229@amt.cnet>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: Avi Kivity <avi@redhat.com>
To: kvm <kvm@vger.kernel.org>
Return-path: <kvm-owner@vger.kernel.org>
Received: from mx1.redhat.com ([209.132.183.28]:23283 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1753714AbZJAW3S (ORCPT <rfc822;kvm@vger.kernel.org>);
	Thu, 1 Oct 2009 18:29:18 -0400
Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12])
	by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id n91MTMB9004048
	for <kvm@vger.kernel.org>; Thu, 1 Oct 2009 18:29:22 -0400
Content-Disposition: inline
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>


Disable paravirt MMU capability reporting, so that new (or rebooted)
guests switch to native operation.

Paravirt MMU is a burden to maintain and does not bring significant
advantages compared to shadow anymore.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>


diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ffccb5c..fe467cb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1238,8 +1238,8 @@ int kvm_dev_ioctl_check_extension(long ext)
 	case KVM_CAP_NR_MEMSLOTS:
 		r = KVM_MEMORY_SLOTS;
 		break;
-	case KVM_CAP_PV_MMU:
-		r = !tdp_enabled;
+	case KVM_CAP_PV_MMU:	/* obsolete */
+		r = 0;
 		break;
 	case KVM_CAP_IOMMU:
 		r = iommu_found();