From: Ladi Prosek <lprosek@redhat.com>
Date: Fri, 31 Mar 2017 08:19:26 +0000 (+0200)
Subject: KVM: nVMX: do not leak PML full vmexit to L1
X-Git-Tag: v4.11-rc6~12^2~3
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ab007cc94ff9d82f5a8db8363b3becbd946e58cf;p=thirdparty%2Fkernel%2Flinux.git

KVM: nVMX: do not leak PML full vmexit to L1

The PML feature is not exposed to guests so we should not be forwarding
the vmexit either.

This commit fixes BSOD 0x20001 (HYPERVISOR_ERROR) when running Hyper-V
enabled Windows Server 2016 in L1 on hardware that supports PML.

Fixes: 843e4330573c ("KVM: VMX: Add PML support in VMX")
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2ee00dbbbd518..6051832910698 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8198,6 +8198,9 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
 		return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES);
 	case EXIT_REASON_PREEMPTION_TIMER:
 		return false;
+	case EXIT_REASON_PML_FULL:
+		/* We don't expose PML support to L1. */
+		return false;
 	default:
 		return true;
 	}