linux-kernel - Re: [PATCH v10 11/26] s390: vfio-ap: implement mediated device open callback

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Date:   Mon, 24 Sep 2018 10:40:18 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Tony Krowiak <akrowiak@...ux.ibm.com>,
        Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        frankja@...ux.ibm.com
Subject: Re: [PATCH v10 11/26] s390: vfio-ap: implement mediated device open
 callback


>   /**
> - * Verify that the AP instructions are available on the guest. This is 
> indicated
> - * via the  KVM_S390_VM_CPU_FEAT_AP CPU model feature.
> + * Verify that the AP instructions are being interpreted by firmware 
> for the
> + * guest. This is indicated by the kvm->arch.crypto.apie flag.
>    */
>   static int kvm_ap_validate_crypto_setup(struct kvm *kvm)
>   {
> -	if (test_bit_inv(KVM_S390_VM_CPU_FEAT_AP, kvm->arch.cpu_feat))
> +	if (kvm->arch.crypto.apie)
>   		return 0;

I wonder if this check makes sense, because apie can be toggled during
runtime. I guess it would be sufficient to check if the ap control block
is available and apie is supported by the HW.


-- 

Thanks,

David / dhildenb