Virtualization - Oct 2023 - [PATCH vfio 10/11] vfio/virtio: Expose admin commands over virtio device

On Tue, Oct 10, 2023 at 10:10:31AM -0300, Jason Gunthorpe
wrote:
> > > There is alot of code in VFIO and the VMM side to take a VF and
turn
> > > it into a vPCI function. You can't just trivially duplicate
VFIO in a
> > > dozen drivers without creating a giant mess.
> > 
> > I do not advocate for duplicating it.  But the code that calls this
> > functionality belongs into the driver that deals with the compound
> > device that we're doing this work for.
> 
> On one hand, I don't really care - we can put the code where people
> like.
> 
> However - the Intel GPU VFIO driver is such a bad experiance I don't
> want to encourage people to make VFIO drivers, or code that is only
> used by VFIO drivers, that are not under drivers/vfio review.
So if Alex feels it makes sense to add some virtio functionality
to vfio and is happy to maintain or let you maintain the UAPI
then why would I say no? But we never expected devices to have
two drivers like this does, so just exposing device pointer
and saying "use regular virtio APIs for the rest" does not
cut it, the new APIs have to make sense
so virtio drivers can develop normally without fear of stepping
on the toes of this admin driver.

-- 
MST