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Re: [Xen-devel] RE: Some questions of VT-D graphic passthrough

To: Tim Moore <timothy.moore@xxxxxxxxxxx>
Subject: Re: [Xen-devel] RE: Some questions of VT-D graphic passthrough
From: Jean Guyader <jean.guyader@xxxxxxxxx>
Date: Wed, 15 Apr 2009 11:47:10 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, wei zhou <weizhou.sir@xxxxxxxxx>
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2009/4/15 Tim Moore <timothy.moore@xxxxxxxxxxx>:
> Answers inline below….
>    I heard the good news you published from Xen Maillist.That really
> inspired me. Recently i was working on vt-d graphic passthrough  experiment.
> That was a real tough job for me. I faced some problems that you may also
> met before. So i hope you can give me any advises or informaitons.
>    Any reply  appreciated!
> HardWare:  Q35 matherboard + PCIE NVIDIA 9400 + PCI ATI R128 + IGD Intel
>                    Two Monitors connected with respective cards
> OS           :  Domain0 (Gentoo X86_64 2.6.28)
>                    DomainU (Ubuntu i386 / windows xp / RedHat Ent4.5)
>                    Xen3.3.1
> At first ,I assumed the Matherboard integrated graphic card for Domain0 then
> passthrough the PCIE NVIDIA graphic card for DomainU.
> But My Matherboard cann't support those two cards work together.
>  And Everytime i use the PCIE card render for Domain0, the VT-D can't be
> Enable Because of the RMMR incorrect.
> See:
> http://www.nabble.com/Re:-Re:-VT-D-RMRR-is-incorrect-p22022061.html
> Use this work around and (/* the whole “if” section */) and recompile Xen
> I think VT-d is needed for this to work …
> Considered that reason , the PCIE card was aborted in my experiment.
> Now I use the integrated card as the primary card ,the ATI PCI graphic card
> as the secondly.
> Now i face the problem is that the DomainU asigned the ATI card can't
> displaied on the Monitor connected with the ATI card.

ATI graphic driver doesn't work with vt-d.

> From you information on Xen maillist,
> you passthrough the PCIE NVIDIA card to DomainU --> boot from console  -->
> setup the proper driver for that card --> startx --> then the DomainU
> display on the second Monitor
> Any other works ?
> Is that right?  You didn't change any source codes. The whole process are
> works about configurations.
> I tried install a R128 driver in DomainU for the ATI card and Modified the
> xorg.conf(/etc/X11/xorg.conf) to tell the DomainU use the ATI card do render
> work.
> whatever i do the DomainU always stay on the same screen.
> Now i have none idea for the next step .
> Hope you can give me some help.

Usually the linux drivers are a bit more flexible. And works with vt-d.

Jean Guyader

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