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Subject: Re: [PATCH v3 04/14] KVM: s390: device attribute to set AP
 interpretive execution
To:     Pierre Morel <pmorel@linux.vnet.ibm.com>,
        Halil Pasic <pasic@linux.vnet.ibm.com>,
        linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org
Cc:     freude@de.ibm.com, schwidefsky@de.ibm.com,
        heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
        cohuck@redhat.com, kwankhede@nvidia.com,
        bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com,
        alex.williamson@redhat.com, alifm@linux.vnet.ibm.com,
        mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com,
        thuth@redhat.com, berrange@redhat.com, fiuczy@linux.vnet.ibm.com,
        buendgen@de.ibm.com
References: <1521051954-25715-1-git-send-email-akrowiak@linux.vnet.ibm.com>
 <1521051954-25715-5-git-send-email-akrowiak@linux.vnet.ibm.com>
 <d86ad01e-1c79-c14c-b4da-09d9a31572bd@linux.vnet.ibm.com>
 <3afd28d7-57c6-cda6-a436-18da32ef0df3@linux.vnet.ibm.com>
 <1e8a4cfc-1425-b30e-2875-2a5c5d9bcb7c@linux.vnet.ibm.com>
From:   Tony Krowiak <akrowiak@linux.vnet.ibm.com>
Date:   Thu, 15 Mar 2018 19:37:36 -0400
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On 03/15/2018 12:00 PM, Pierre Morel wrote:
> On 15/03/2018 16:23, Tony Krowiak wrote:
>> On 03/14/2018 05:57 PM, Halil Pasic wrote:
>>>
>>> On 03/14/2018 07:25 PM, Tony Krowiak wrote:
>>>> The VFIO AP device model exploits interpretive execution of AP
>>>> instructions (APIE) to provide guests passthrough access to AP
>>>> devices. This patch introduces a new device attribute in the
>>>> KVM_S390_VM_CRYPTO device attribute group to set APIE from
>>>> the VFIO AP device defined on the guest.
>>>>
>>>> Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
>>>> ---
>>> [..]
>>>
>>>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>>>> index a60c45b..bc46b67 100644
>>>> --- a/arch/s390/kvm/kvm-s390.c
>>>> +++ b/arch/s390/kvm/kvm-s390.c
>>>> @@ -815,6 +815,19 @@ static int kvm_s390_vm_set_crypto(struct kvm 
>>>> *kvm, struct kvm_device_attr *attr)
>>>> sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
>>>>           VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
>>>>           break;
>>>> +    case KVM_S390_VM_CRYPTO_INTERPRET_AP:
>>>> +        if (attr->addr) {
>>>> +            if (!test_kvm_cpu_feat(kvm, KVM_S390_VM_CPU_FEAT_AP))
>>> Unlock mutex before returning?
>> The mutex is unlocked prior to return at the end of the function.
>>>
>>> Maybe flip conditions (don't allow manipulating apie if feature not 
>>> there).
>>> Clearing the anyways clear apie if feature not there ain't too bad, but
>>> rejecting the operation appears nicer to me.
>> I think what you're saying is something like this:
>>
>>     if (!test_kvm_cpu_feat(kvm, KVM_S390_VM_CPU_FEAT_AP))
>>         return -EOPNOTSUPP;
>>
>>     kvm->arch.crypto.apie = (attr->addr) ? 1 : 0;
>>
>> I can make arguments for doing this either way, but since the attribute
>> is will most likely only be set by an AP device in userspace, I suppose
>> it makes sense to allow setting of the attribute if the AP feature is
>> installed. It certainly makes sense for the dedicated implementation.
>>>
>>>> +                return -EOPNOTSUPP;
>
> Obviously Halil is speaking on this return statement.
> Which returns without unlocking the mutex.
Got it.
>
>
>
>