Re: [Xen-users] Identifying graphics cards for passthrough

[Paul Stimpson <paul@xxxxxxxxxxxxxxxxxxxx>]

Hi Peter,

Thank you.

On 09/04/13 22:11, Peter Maloney wrote:
> On 04/09/2013 08:49 PM, Paul Stimpson wrote:
> > Hi,
> >
> > I have an HP workstation here with two identical AMD V5900 graphics
> > cards in it. I'm finding it really challenging following the
> > instructions to get VGA passthrough working. Thanks for the help
> > you've given me so far. The host OS is Ubuntu 12.04 LTS 64-bit with
> > the XFCE desktop.
> Is that a firepro?
> This page mentions the FirePro V5700, which I guess means it works with
> secondary passthrough.
> http://wiki.xen.org/wiki/Xen_VGA_Passthrough_Tested_Adapters#ATI.2FAMD_display_adapters
Sorry. My mistake. it is a Firepro v5700. I was talking to HP about the 
v5900 as they are dropping the v5700 and wanted us to consider it as an 
alternative.

> > The Xen install has a Windows guest and I want to pass one of the
> > cards through to it. The cards each appear as two devices (a graphics
> > card and an associated sound card that provides the HDMI audio out).
> > So I have:
> >
> >      * 00:04:00.0 - Graphics card
> >      * 00:04:00.1 - Audio device
> >      * 00:05:00.0 - Graphics card
> >      * 00:05:00.1 - Audio device
> >
> > I swapped which device was primary in the BIOS as it made the layout
> > of the wiring on the back panel more logical.
> >
> > My first stupid question is: How do I work out which card is the
> > primary and secondary to know which one to pass into the guest please?
> Not sure... there's probably some X command that should tell you which
> one is the one used by X. Otherwise, you can just try unbinding the
> driver for one and see :) (if the screen goes black, you picked the one
> dom0 is using)
I looked in Xorg.0.log and it it has a * next to the 04:00.0 card and 
it's listed as card0 so I think it's probably that one.
> > I think I need to use gfx_passthru=1
> >
> > I am already passing other PCI devices through to the guest
> > successfully. Say for example 00:06:00.0.
> >
> > How do I write this for the conf file please. I tried things like:
> >
> >      gfx_passthru=1
> >      pci=['0000:04:00.0','0000:04:00.1','0000:06:00.0']
> # 0 is secondary passthrough; 1 is primary passthrough
> gfx_passthru=0
> # without the 0000: (not sure if it is a problem though)
> pci=['04:00.0','04:00.1','06:00.0']
I tried this (I put the other card in /etc/modprobe.d/pciback.conf to 
hide it) but Xen says the card is not assignable. When I run the machine 
up, there is what looks like Linux boot logging on the second monitor 
that stays there after the machine comes up.
I'm obviously doing something wrong but, right now, I'm not sure what it is.

Thanks,
Paul.



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