linux-kernel - Re: [PATCH v17 01/15] s390/vfio-ap: Set pqap hook when vfio

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Date:   Tue, 11 Jan 2022 12:29:55 -0500
From:   Tony Krowiak <akrowiak@...ux.ibm.com>
To:     jjherne@...ux.ibm.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     freude@...ux.ibm.com, borntraeger@...ibm.com, cohuck@...hat.com,
        mjrosato@...ux.ibm.com, pasic@...ux.ibm.com,
        alex.williamson@...hat.com, kwankhede@...dia.com,
        fiuczy@...ux.ibm.com
Subject: Re: [PATCH v17 01/15] s390/vfio-ap: Set pqap hook when vfio_ap module
 is loaded



On 1/4/22 11:22, Jason J. Herne wrote:
> On 10/21/21 11:23, Tony Krowiak wrote:
>
>> diff --git a/arch/s390/include/asm/kvm_host.h 
>> b/arch/s390/include/asm/kvm_host.h
>> index a604d51acfc8..05569d077d7f 100644
>> --- a/arch/s390/include/asm/kvm_host.h
>> +++ b/arch/s390/include/asm/kvm_host.h
>> @@ -799,16 +799,17 @@ struct kvm_s390_cpu_model {
>>       unsigned short ibc;
>>   };
>>   -typedef int (*crypto_hook)(struct kvm_vcpu *vcpu);
>> +struct kvm_s390_crypto_hook {
>> +    int (*fcn)(struct kvm_vcpu *vcpu);
>> +};
>
> Why are we storing a single function pointer inside a struct? Seems 
> simpler to just use a function pointer. What was the problem with the 
> typedef that you are replacing?

In case you didn't see my response to Halil, the point is now moot 
because I'm eliminating this patch.