Re: [PATCH v1] s390/vfio-ap: Signal eventfd when guest AP configuration is changed

Anthony Krowiak
2025-02-05T17:48:01Z

On 2/5/25 12:33 PM, Rorie Reyes wrote:
>
> On 1/13/25 11:08 AM, Alexander Gordeev wrote:
>> On Tue, Jan 07, 2025 at 01:36:45PM -0500, Rorie Reyes wrote:
>>
>> Hi Rorie, Antony,
>>
>>> Note that there are corresponding QEMU patches that will be shipped
>>> along
>>> with this patch (see vfio-ap: Report vfio-ap configuration changes)
>>> that
>>> will pick up the eventfd signal.
>> How this patch is synchronized with the mentioned QEMU series?
>> What is the series status, especially with the comment from Cédric Le
>> Goater [1]?
>>
>> 1.
>> https://lore.kernel.org/all/20250107184354.91079-1-rreyes@linux.ibm.com/T/#mb0d37909c5f69bdff96289094ac0bad0922a7cce
>>
>> Thanks!
>
> Hey Alex, sorry for the long delay. This patch is synchronized with
> the QEMU series by registering an event notifier handler to process AP
> configuration
>
> change events. This is done by queuing the event and generating a CRW.
> The series status is currently going through a v2 RFC after
> implementing changes
>
> requested by Cedric and Tony.
>
> Let me know if there's anything else you're concerned with
>
> Thanks!

I don't think that is what Alex was asking. I believe he is asking how
the QEMU and kernel patch series are going to be synchronized.
Given the kernel series changes a value in vfio.h which is used by QEMU,
the two series need to be coordinated since the vfio.h file
used by QEMU can not be updated until the kernel code is available. So
these two sets of code have
to be merged upstream during a merge window. which is different for the
kernel and QEMU. At least I think that is what Alex is asking.