linux-kernel - [REGRESSION][v6.8-rc1] virtio-pci: Introduce admin virtqueue

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Date: Fri, 3 May 2024 14:03:15 -0400
From: Joseph Salisbury <joseph.salisbury@...onical.com>
To: feliu@...dia.com
Cc: parav@...dia.com, jiri@...dia.com, mst@...hat.com, yishaih@...dia.com,
 alex.williamson@...hat.com, jasowang@...hat.com, xuanzhuo@...ux.alibaba.com,
 virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org,
 Francis Ginther <francis.ginther@...onical.com>,
 John Cabaj <john.cabaj@...onical.com>,
 Catherine Redfield <catherine.redfield@...onical.com>,
 Ankush Pathak <ankush.pathak@...onical.com>,
 Chlo Smith <chloe.smith@...onical.com>
Subject: [REGRESSION][v6.8-rc1] virtio-pci: Introduce admin virtqueue

Hi Feng,

During testing, a kernel bug was identified with the suspend/resume 
functionality on instances running in a public cloud [0].  This bug is a 
regression introduced in v6.8-rc1.  After a kernel bisect, the following 
commit was identified as the cause of the regression:

        fd27ef6b44be  ("virtio-pci: Introduce admin virtqueue")

I was hoping to get your feedback, since you are the patch author. Do 
you think gathering any additional data will help diagnose this issue?  
This commit is depended upon by other virtio commits, so a revert test 
is not really straight forward without reverting all the dependencies.   
Any ideas you have would be greatly appreciated.


Thanks,

Joe

http://pad.lv/2063315