On Thu, Jun 04, 2026 at 08:01:41AM -0700, Dimitri Daskalakis wrote:

With this patchset core enumarates the SIOV capability and can identify
SIOV PFs. But there is no central mechanism to allocate/manage SIOV VFs.
To support device pass through, devices will need to add a vfio-mdev
driver with IOMMUFD support (or something similar).

There is an enormous amount of missing work to do something useful
with the SIOVr2 stuff. IIRC there is even supposed to be BIOS
components in this plan and there are some missing PCI SIG topics too
IIRC.

So, I'm not sure how much value there is in merging just the cap
discovery without a roadmap for the missing parts..

Also, I'm quite surprised to see this out of the blue, there is an OCP
workstream that was building out a standard that outlines how all the
different components have to act to successfully implement it.  What
is in PCI SIG was just some minor foundational adjustments without any
context on how to form them into a solution.

I think it is extremely premature to merge anything related to SIOV to
the kernel. Join the OCP work stream if you are interested. I think
the general feeling was there is not sufficient interest in the
industry to do this and it has gone quiet.

Jason