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Re: [vfio-users] [FEEDBACK NEEDED] Rewriting the Arch wiki article



I'm an intermediate Linux user, so this this stuff can be complicated to me sometimes.  Right now I'm having trouble setting up a network bridge that virt-manager will recognize.  I've arrived at the conclusion that this simply isn't possible on Arch.  That said, I can't find any documentation on how to convince qemu to use an existing network bridge.  If you're willing, please add this information as well.  If you already know how, any pointers would be greatly appreciated.

Best,
Garland

On Mon, Apr 18, 2016 at 5:14 PM, Garland Key <david garland key gmail com> wrote:
Please add what to do if you have two identical GPUs.  Here is exactly what is needed to make it work.

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/etc/modprobe.d/vfio.conf


    install vfio-pci /sbin/vfio-pci-override-vga.sh
    options vfio-pci disable_vga=1 allow_unsafe_interrupts=1

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/sbin/vfio-pci-override-vga.sh

    
#!/bin/sh
    
    for i in $(find /sys/devices/pci* -name boot_vga); do
            if [ $(cat $i) -eq 0 ]; then
                    GPU=$(dirname $i)
                    AUDIO=$(echo $GPU | sed -e "s/0$/1/")
                   echo "vfio-pci" > $GPU/driver_override
                    if [ -d $AUDIO ]; then
                            echo "vfio-pci" > $AUDIO/driver_override
                    fi
            fi
    done
    
    modprobe -i vfio-pci

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Add the following to /etc/mkinitcpio.conf and then run mkinitcpio -p linux

    
BINARIES="/usr/bin/find /usr/bin/dirname"
    FILES="/sbin/vfio-pci-override-vga.sh"

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Tested Hardware:

Motherboard: Asus Sabertooth X99
CPUIntel Core i7-5930K
GPU 1: GIGABYTE GeForce GTX 970 4GB G1 Gaming OC Edition
GPU 2: GIGABYTE GeForce GTX 970 4GB G1 Gaming OC Edition
RAM: 32GB Corsair Dominator Platinum DDR4 (CMD16GX4M2A2666C15)


On Tue, Apr 12, 2016 at 3:36 PM, Nicolas Roy-Renaud <nicolas roy-renaud 1 ens etsmtl ca> wrote:
I'm currently planning a full rewrite of the article on Arch wiki about PCI passthroughs and, as per Arch wiki guidelines, I'm supposed get the approval of other users before undergoing such comlex edits. If anyone on this mailing list is an Arch wiki collaborator or frequent user, I would appreciate if you could give me some feedback on the planned structure and propose additional sections or potential user mistakes to highlight. My primary objective here is to make most of what's on Alex Williamson's blog more straightforward and concise.

I've already rewritten the first two sections ("Prerequisites" and "Setting up IOMMU"), and the rest of the article should essentially follow the same basic structure and style. Replies here or on the wiki's discussion page would be much appreciated.

-Nicolas

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