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

Tony Krowiak
2018-04-17T16:16:32Z

On 04/16/2018 09:53 AM, Cornelia Huck wrote:
> On Mon, 16 Apr 2018 15:13:59 +0200
> Pierre Morel <pmorel@linux.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.

>