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 4.4-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-4.4 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
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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
@@ -7838,6 +7838,9 @@ static bool nested_vmx_exit_handled(stru
return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES);
case EXIT_REASON_PCOMMIT:
return nested_cpu_has2(vmcs12, SECONDARY_EXEC_PCOMMIT);
+ 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-4.4/kvm-nvmx-do-not-leak-pml-full-vmexit-to-l1.patch
queue-4.4/kvm-nvmx-initialize-pml-fields-in-vmcs02.patch