Re: [Xen-users] ATI VGA Passthrough / Xen 4.2 / Linux 3.8.6

[Aurélien MILLIAT <Aurelien.MILLIAT@xxxxxxxxxxxxxx>]

>De : xen-users-bounces@xxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxx] 
>De la part de Gordan Bobic
>Envoyé : lundi 15 avril 2013 00:47
>À : xen-users@xxxxxxxxxxxxx
>Objet : [Xen-users] ATI VGA Passthrough / Xen 4.2 / Linux 3.8.6
>
>Hi,
>
>I'm trying to get VGA passthrough to work to an XP x64 guest, and I'm seeing 
>"interesting" things happening.
>
>I'm using the kernel and userspace tools from here:
>http://xen.crc.id.au/support/guides/install/#
>on Scientific Linux 6.
>
>I gave up on trying to get an Nvidia card to work in the guest having read 
>about the extra patches required to get a non-Quadro card to work. 
>So I switched to using an ATI 6450/7450 card. This works fine - almost. 
>ATI cards have a secondary audio output device function on them for outputting 
>audio over HDMI outputs. When I pass both the VGA and >the HDMI audio devices 
>from the host to the guest, the guest cannot use the VGA card. It always shows 
>up as unusable in the guest (yellow >exclamation mark in XP x64).
>

I've got the same behavior with Quadro FX3800. One possible workaround for that 
is to deactivate then to activate the card in your domU and reboot it.
Check if you have FLR function (lspci -vv): 
http://wiki.xen.org/wiki/Xen_PCI_Passthrough#How_can_I_check_if_PCI_device_supports_FLR_.28Function_Level_Reset.29_.3F
I think this behavior is linked to the non-support of this function.

Aurelien

>
>What is the best way to debug this further?
>
>Gordan

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