Re: [PATCH v2 03/10] PCI/LUO: Forward prepare()/freeze()/cancel() callbacks to driver

Chris Li
2025-10-03T17:44:36Z

On Fri, Oct 3, 2025 at 5:06 AM Jason Gunthorpe <jgg@ziepe.ca> wrote:
>
> On Thu, Oct 02, 2025 at 10:24:59PM -0700, Chris Li wrote:
>
> > As David pointed out in the other email, the PCI also supports other
> > non vfio PCI devices which do not have the FD and FD related sessions.
> > That is the original intent for the LUO PCI subsystem.
>
> This doesn't make sense. We don't know how to solve this problem yet,
> but I'm pretty confident we will need to inject a FD and session into
> these drivers too.

Ack. I can start hacking on hook up the PCI layer to the vfio FD and
sessions. Not sure how to do that at this point yet, I will give it a
stab and report back.

>
> > away once we have the vfio-pci as the real user. Actually getting the
> > pci-pf-stub driver working would be a smaller and reasonable step to
> > justify the PF support in LUO PCI.
>
> In this contex pci-pf-stub is useless, just use vfio-pci as the SRIOV
> stub. I wouldn't invest in it. Especially since it creates more
> complexity because we don't have an obvious way to get the session FD.

Ack. I will not do pci-pf-stub then.

Chris