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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <f1af50b3-f966-445d-ab89-3d213f55b93a@linux.ibm.com>
Date: Wed, 5 Feb 2025 12:47:55 -0500
From: Anthony Krowiak <akrowiak@...ux.ibm.com>
To: Rorie Reyes <rreyes@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>
Cc: linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, hca@...ux.ibm.com, borntraeger@...ibm.com,
        gor@...ux.ibm.com, pasic@...ux.ibm.com, jjherne@...ux.ibm.com,
        alex.williamson@...hat.com
Subject: Re: [PATCH v1] s390/vfio-ap: Signal eventfd when guest AP
 configuration is changed




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.