On 05/17/2018 01:12 PM, Kyle Marek wrote: > On 05/17/2018 10:27 AM, Alex Williamson wrote: >> On Thu, 17 May 2018 12:56:49 +0800 >> Eddie Yen <missile0...@gmail.com> wrote: >> >>> Hi everyone, >>> >>> IME, you can set VID:PID by adding "options vfio-pci" into conf file and >>> put at modprobe.d >>> So that VFIO can take over the device that had same VID:PID when boot. >>> >>> But how can I set this option by using PCI Address without using override >>> script? >> There's no such module option, what's wrong with a script? Part of the >> reason we don't have such a module option is that PCI addresses are not >> persistent, they can change based on devices added or removed, or even >> motherboard BIOS updates. Userspace has more flexibility for managing >> this and is fully able to do so via initrd scripts and modprobe.d. >> Thanks, >> >> Alex > That's a good point. > > However, I had an environment where I needed to pass through one of two > devices with the same PCI IDs. I accomplished it with an install command > in my modprobe config. > > I can probably make this look at other factors before overriding the > driver, but the following config might work well enough if the PCI IDs > don't change:
If PCI addresses don't change* > # For each PCI device listed in the for-loop, override their assigned driver > # to vfio-pci, for usage with PCI-passthrough. > # > # Please make sure to include vfio-pci in the initrd, or some other modules > # will likely claim the devices first. This can be done on systems that use > # initramfs-tools by adding "vfio-pci" to /etc/initramfs-tools/modules > install vfio-pci for dev in 0000:03:00.0 0000:03:00.1; do echo vfio-pci > > "/sys/bus/pci/devices/$dev/driver_override"; done; /sbin/modprobe > --ignore-install vfio-pci $CMDLINE_OPTS > > # Load vfio-pci before some other drivers so they don't claim devices first. > # The pre-drm line should handle all graphics drivers. > softdep snd_hda_intel pre: vfio-pci > softdep drm pre: vfio-pci > > > This worked well for me in dracut and initramfs-tools initrds with the > vfio-pci module included. _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
