On Thu, 16 Dec 2021 11:39:13 +0100 Cornelia Huck <cohuck@xxxxxxxxxx> wrote: > > Also what does vfio-pci do? As far as I can tell vfio-pci does not > > participate in module auto loading just because there are pci devices. > > The have some smart override I don't quite understand: > > https://patchwork.ozlabs.org/project/linux-pci/patch/20210826103912.128972-11-yishaih@xxxxxxxxxx/ > > Before, I don't think they had a MODULE_DEVICE_TABLE: > > https://elixir.bootlin.com/linux/v5.8.18/source/drivers/vfio/pci/vfio_pci.c > > I don't think it makes sense to look at pci for inspiration here; they > have a myriad of different device types, while ap only has a few (and > probably not that many different ones on a given system), and css only > has one that really matters. I really don't understand how they having a myraid of different device types is relevant here. Are they not taking care of that by using PCI_ANY_ID anyway? Can you please explain? Please have another look at the commit message of cc6711b0bf36 ("PCI / VFIO: Add 'override_only' support for VFIO PCI sub system"). They generate alias(es) that catch every PCI device (via PCI_ANY_ID), but in a way that precludes auto-loading and enables a generic 'override' algorithm. Regards, Halil
