linux-kernel - [061/197] KVM: x86: disable paravirt mmu reporting

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Message-Id: <20100422190912.846934919@kvm.kroah.org>
Date:	Thu, 22 Apr 2010 12:08:32 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Avi Kivity <avi@...hat.com>, Gleb Natapov <gleb@...hat.com>,
	Stefan Bader <stefan.bader@...onical.com>
Subject: [061/197] KVM: x86: disable paravirt mmu reporting

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Marcelo Tosatti <mtosatti@...hat.com>

commit a68a6a7282373bedba8a2ed751b6384edb983a64 upstream

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@...hat.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
Signed-off-by: Stefan Bader <stefan.bader@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 arch/x86/kvm/x86.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1242,8 +1242,8 @@ int kvm_dev_ioctl_check_extension(long e
 	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();


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