> From: Jason Gunthorpe <jgg@xxxxxxxxxx> > Sent: Wednesday, September 22, 2021 8:23 PM > > On Wed, Sep 22, 2021 at 09:23:34AM +0000, Tian, Kevin wrote: > > > > Providing an ioctl to bind to a normal VFIO container or group might > > > allow a reasonable fallback in userspace.. > > > > I didn't get this point though. An error in binding already allows the > > user to fall back to the group path. Why do we need introduce another > > ioctl to explicitly bind to container via the nongroup interface? > > New userspace still needs a fallback path if it hits the 'try and > fail'. Keeping the device FD open and just using a different ioctl to > bind to a container/group FD, which new userspace can then obtain as a > fallback, might be OK. > > Hard to see without going through the qemu parts, so maybe just keep > it in mind > sure. will figure it out when working on the qemu part.
