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

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@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 0ffec8a8074ff99a1ca80906b3e58225a61b8e7c..89b98e07211f6f4e17dec041974280b5ffe5f8a1 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8135,6 +8135,9 @@ 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;
        }