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 <stable@xxxxxxxxxxxxxxx> know about it. >From ab007cc94ff9d82f5a8db8363b3becbd946e58cf Mon Sep 17 00:00:00 2001 From: Ladi Prosek <lprosek@xxxxxxxxxx> Date: Fri, 31 Mar 2017 10:19:26 +0200 Subject: KVM: nVMX: do not leak PML full vmexit to L1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Ladi Prosek <lprosek@xxxxxxxxxx> 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. Fixes: 843e4330573c ("KVM: VMX: Add PML support in VMX") Signed-off-by: Ladi Prosek <lprosek@xxxxxxxxxx> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> Signed-off-by: Radim Krčmář <rkrcmar@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/x86/kvm/vmx.c | 3 +++ 1 file changed, 3 insertions(+) --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -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 lprosek@xxxxxxxxxx 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