> From: Jason Gunthorpe <jgg@xxxxxxxxxx> > Sent: Thursday, September 23, 2021 7:52 AM > > On Wed, Sep 22, 2021 at 11:45:33PM +0000, Tian, Kevin wrote: > > > From: Alex Williamson <alex.williamson@xxxxxxxxxx> > > > btw I realized another related piece regarding to the new layout that > > Jason suggested, which have sys device node include a link to the vfio > > devnode: > > > > /sys/bus/pci/devices/DDDD:BB:DD.F/vfio/vfioX/dev > > > > This for sure requires specific vfio driver support to get the link > > established. > > It doesn't. Just set the parent device of the vfio_device's struct > device to the physical struct device that vfio is already tracking - > ie the struct device providing the IOMMU. The driver core takes care > of everything else. > Thanks for correction. So it's still the same try-and-fail model for both devices which support iommufd and which do not.
