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

Bronek Kozicki Tue, 19 Apr 2016 01:42:57 -0700

First xml is a network definition file - as said earlier, they are one way for managing libvirt networking, which I do not use. Meaning, you do not need it if you want to do it "Bronek's way". However you may need to ensure that qemu helper is defined in libvirt configuration - look my messages from past few days.

Second xml is part of VM definition, a sibling to hostdev nodes etc. You can create this part in virt-manager GUI, no need to edit xml by hand - just make sure to select the bridge you have created.

From: Garland Key

Sent: Monday, 18 April 2016 23:41

To: Bronek Kozicki

Cc: vfio-users

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

‎

Sorry to pester you with so many questions. I appreciate your help.
‎
Where should the following configuration be placed? What is the config filename and path?

I've done the same. Bridge created with NM and used by the VM. You
should be able to just select the bridge device. That's the resulting
XML for me:

<network connections='1'>
<name>default</name>
<uuid>278badf4-d33e-493e-b604-083b3dcc2804</uuid>
<forward mode='bridge'/>
<bridge name='br0'/>
</network>
‎

Is this placed into your VM XML via virsh?
‎
<interface type='bridge'>
<mac address='52:54:01:hi:dd:en'/>
<source bridge='br0'/>
<model type='virtio'/>
<driver queues='8'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x18' function='0x0'/>
</interface>

On Mon, Apr 18, 2016 at 5:57 PM, Bronek Kozicki <b...@spamcop.net> wrote:

For me setting up networking with an existing bridge "just works", I wrote few days ago on this lis how I've set it up on my machine. Hint: I do not use virsh "networks" capabilities at all - none defined (undefined the default one) and none started. Just my, manually crafted bridge, explicitly used in VM definitions.

B.

From: Garland Key
Sent: Monday, 18 April 2016 22:21
To: Nicolas Roy-Renaud; vfio-users
Subject: 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....@gmail.com> wrote:
Please add what to do if you have two identical GPUs. Here is exactly what is needed to make it work.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

/etc/modprobe.d/vfio.conf

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

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

/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

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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"

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Tested Hardware:

Motherboard: Asus Sabertooth X99
CPU: Intel 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-renau...@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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Re: [vfio-users] [FEEDBACK NEEDED] Rewriting the Arch wiki article

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