From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Fri, 19 Mar 2010 14:47:39 +0000 (+0100)
Subject: KVM: x86: disable paravirt mmu reporting
X-Git-Tag: firefly_0821_release~10186^2~1855
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c72a8076fc664e019ceac47b91d0e056137d0d7b;p=firefly-linux-kernel-4.4.55.git

KVM: x86: disable paravirt mmu reporting

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@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 59647016a0b5..0adbed229e25 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1242,8 +1242,8 @@ 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();