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Subject: Re: [PATCH v10 11/26] s390: vfio-ap: implement mediated device open
 callback
To:     Tony Krowiak <akrowiak@linux.ibm.com>,
        Tony Krowiak <akrowiak@linux.vnet.ibm.com>,
        linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
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From:   David Hildenbrand <david@redhat.com>
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Date:   Mon, 24 Sep 2018 10:40:18 +0200
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>   /**
> - * 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