Patch "KVM: nVMX: do not leak PML full vmexit to L1" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

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

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
kvm-nvmx-do-not-leak-pml-full-vmexit-to-l1.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Ladi Prosek <[email protected]>
Date: Fri, 31 Mar 2017 10:19:26 +0200
Subject: KVM: nVMX: do not leak PML full vmexit to L1
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From: Ladi Prosek <[email protected]>

commit ab007cc94ff9d82f5a8db8363b3becbd946e58cf upstream.

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.

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

@@ -8135,6 +8135,9 @@ static bool nested_vmx_exit_handled(stru
 		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;
 	}

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/kvm-nvmx-do-not-leak-pml-full-vmexit-to-l1.patch queue-4.9/kvm-nvmx-initialize-pml-fields-in-vmcs02.patch