linux-kernel - Re: [PATCH v4 15/15] s390: doc: detailed specifications for AP virtualization

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Message-Id: <c7c9b2d6-cea6-157c-b5fd-e9ac11705599@linux.vnet.ibm.com>
Date:   Tue, 17 Apr 2018 12:16:32 -0400
From:   Tony Krowiak <akrowiak@...ux.vnet.ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        Pierre Morel <pmorel@...ux.vnet.ibm.com>, buendgen@...ibm.com
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        kwankhede@...dia.com, bjsdjshi@...ux.vnet.ibm.com,
        pbonzini@...hat.com, alex.williamson@...hat.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
Subject: Re: [PATCH v4 15/15] s390: doc: detailed specifications for AP
 virtualization

On 04/16/2018 09:53 AM, Cornelia Huck wrote:
> On Mon, 16 Apr 2018 15:13:59 +0200
> Pierre Morel <pmorel@...ux.vnet.ibm.com> wrote:
>
>> On 15/04/2018 23:22, Tony Krowiak wrote:
>>> +* Register with the ap_bus for AP queue devices of type CEX4, CEX5 and
>>> +  CEX6 and to provide the vfio_ap driver's probe and remove callback interfaces.
>> I wonder why the type of card has anything to do with this driver.
>> It should be transparent, the driver should be able to provide the
>> matrix (APM/AQM/ADM)
>> independently from the type of card in the slot.
> Would also be interested why this is limited to certain, newer cards.
> Did some kind of interface change (I dimly recall something like that),
> or are simply no old systems with those older card types around to check
> whether it works?

That was a restriction recommended by our crypto architect.

>
> In either case, a short note would be good (does not need to go into
> any details).

I can do that.

>