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

Mon Apr 18 23:03:00 UTC 2016

I'd put the networking stuff, synergy and all that into some sort of 
"Potential improvements" section and link to related pages instead, to 
avoid filling the vfio page with unrelated content for the sake of 
having an entire guide in one place.

About the bridge, double-check the output of `ip a` or `networkctl` if 
you're using systemd-networkd, to make sure that your bridge is properly 
setup as the primary network interface and that nothing else is trying 
to use eth0/enp0s0.

Nicolas

On 2016-04-18 18:56, Garland Key wrote:
> I just tried this and as soon as I start the VM, my bridge on the host 
> fails and defaults to the wired connection.
>
> I think that if the pci-passthrough wiki is going to talk about 
> synergy as an input solution, then it should also discuss creating a 
> bridge, since it's necessary in order to accomplish said goal.
>
> On Mon, Apr 18, 2016 at 6:22 PM, Jonas Camillus Jeppesen 
> <jonascj at sdu.dk <mailto:jonascj at sdu.dk>> wrote:
>
>     On a fresh Arch install (no desktop environment, no network
>     manager) I added a bridge like this with systemd's networkd
>     service:
>     https://wiki.archlinux.org/index.php/Systemd-networkd#DHCP_with_two_distinct_IP
>     . Then in virt-manager under network adapter I just choose
>     "Specify shared device name" as "Network source" and type in "br0"
>     which is the name I gave my bridge.
>
>     This page is unnecessarily complicated it seems to me:
>     https://wiki.archlinux.org/index.php/QEMU#Networking
>
>     The Arch wiki page on vfio isn't really about networking in
>     qemu/kvm, but a note could be added to visit the KVM and QEMU
>     pages, and those could then be updated to mention this
>     systemd-networkd example.
>
>     On 04/18/2016 11:57 PM, Bronek Kozicki 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.key at gmail.com
>>     <mailto:david.garland.key at 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
>>         <https://www.asus.com/us/Motherboards/SABERTOOTH_X99/>
>>         CPU: Intel Core i7-5930K
>>         <http://ark.intel.com/products/82931/Intel-Core-i7-5930K-Processor-15M-Cache-up-to-3_70-GHz>
>>         GPU 1: GIGABYTE GeForce GTX 970 4GB G1 Gaming OC Edition
>>         <http://www.newegg.com/Product/Product.aspx?Item=N82E16814125684>
>>         GPU 2: GIGABYTE GeForce GTX 970 4GB G1 Gaming OC Edition
>>         <http://www.newegg.com/Product/Product.aspx?Item=N82E16814125684>
>>         RAM: 32GB Corsair Dominator Platinum DDR4
>>         (CMD16GX4M2A2666C15)
>>         <http://www.newegg.com/Product/Product.aspx?Item=N82E16820233709>
>>
>>
>>         On Tue, Apr 12, 2016 at 3:36 PM, Nicolas Roy-Renaud
>>         <nicolas.roy-renaud.1 at ens.etsmtl.ca
>>         <mailto:nicolas.roy-renaud.1 at ens.etsmtl.ca>> wrote:
>>
>>             I'm currently planning a full rewrite of the article on
>>             Arch wiki about PCI passthroughs
>>             <https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF>
>>             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
>>             <https://wiki.archlinux.org/index.php/Talk:PCI_passthrough_via_OVMF#Page_rewrite>
>>             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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>>
>>
>>
>>
>>
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