[PATCH] KVM: nVMX: do not leak PML full vmexit to L1

From: Ladi Prosek <lprosek@redhat.com>
To: kvm@vger.kernel.org
Cc: kai.huang@linux.intel.com, wanpeng.li@hotmail.com
Subject: [PATCH] KVM: nVMX: do not leak PML full vmexit to L1
Date: Fri, 31 Mar 2017 10:19:26 +0200	[thread overview]
Message-ID: <20170331081926.28463-1-lprosek@redhat.com> (raw)

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>
---
 arch/x86/kvm/vmx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 2ee00db..6051832 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;
 	}
-- 
2.9.3
