<div dir="ltr">Thanks Alex, I consider myself an intermediate power user. I know enough to understand what the line that you provided does, but not enough to write a solution of my own. I inserted the line that you provided above in /modprobe.d/vfio.conf and it caused X to fail. I had to alt+f2 to comment it out, rebuilt initramfs and then reboot. It was suggested that I could do this through a systemd service in the arch irc channel but nobody was able to provide details other than "man systemd.service". Any further pointers is greatly appreciated. Best, Garland</div> <div class="gmail_quote"><div dir="ltr">On Fri, Feb 19, 2016 at 6:06 PM Alex Williamson <<a href="mailto:alex.williamson@redhat.com">alex.williamson@redhat.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Fri, 19 Feb 2016 16:43:47 -0500 Ben J <<a href="mailto:btpprograms@gmail.com" target="_blank">btpprograms@gmail.com</a>> wrote: > For your latter question, it doesn't seem like you should need to modify it > as his original script already generically finds all GPUs. Did it not work > when you tried it? Also, what type of cards are you using? If they're > NVIDIA with nvidia drivers then I doubt that script will work for you. > I'm using the following guide: > <a href="https://vfio.blogspot.com/2015/05/vfio-gpu-how-to-series-part-3-host.html" rel="noreferrer" target="_blank">https://vfio.blogspot.com/2015/05/vfio-gpu-how-to-series-part-3-host.html</a>. > I'm having trouble adapting some of the Fedora focused instructions for use > in Arch. > > *1. Dracut* > Dracut isn't used in Arch but the mkinitcpio is. You're asked to > insert *add_drivers+="vfio > vfio_iommu_type1 vfio_pci vfio_virqfd" *in: */etc/dracut.conf.d/local.conf*. > Farther down, I'm supposed to insert > *install_items+="/sbin/vfio-pci-override-vga.sh > /usr/bin/find /usr/bin/dirname" *in: */etc/dracut.conf.d/local.conf*. > > Should I instead add these lines to a modprobe.d conf file or should I add > it to the modules line in */etc/mkinitcpio.conf*? > > *2. driver_override* > My bash-foo isn't very good and I need to adapt the following script (see > below) so that it points to the correct directories. In Arch, the directory > for the GPU (02:00.0) and GPU audio (02:00.1) are here: > */sys/devices/pci0000:00/0000:00:02.0/0000:02:00.0/* & > */sys/devices/pci0000:00/0000:00:02.0/0000:02:00.1/* > > > > > > > > * #!/bin/sh DEVS="0000:02:00.0 0000:02:00.1" for DEV in $DEVS; > do echo "vfio-pci" > /sys/bus/pci/devices/$DEV/driver_override done > modprobe -i vfio-pci* There are really just so many ways to solve this problem, don't feel like you need to stick with the approaches I've given. If you want something that only depends on modprobe.d, then the "install" directive is really powerful. For instance, let's say I have a pair of identical nvidia cards, one at 01:00.0 and the other at 02:00.0 and I want to use 02: for my guest. I could do something like: install nvidia "echo vfio-pci > /sys/bus/pci/devices/0000:02:00.0/driver_override; modprobe --ignore-install nvidia" This tells modprobe that before loading the nvidia driver, set the driver override so that only vfio-pci can claim 02:00.0, then load the nvidia driver. You can do the same with the audio function and snd_hda_intel driver. You can wait til later to actually load the vfio-pci module, it's not really necessary to include them in your initramfs. As for sysfs paths, the actual devices do live in /sys/devices/, but there are links to them in /sys/bus/pci/devices/, this is a kernel property, your choice of distribution isn't going to change that. Thanks, Alex </blockquote></div>