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

["Radim Krčmář" <rkrcmar@redhat.com>]

2017-05-02 15:05+0200, Paolo Bonzini:
> On 31/03/2017 10:19, Ladi Prosek wrote:
>> 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;
>>  	}
>> 
> 
> This fell through the cracks, I'm queueing it now.

It is in Linus' tree as ab007cc94ff9, we are just missing it in queue
and next as they haven't merged yet.