Re: [Xen-users] Xen 4.1.0 - VGA Passthrough ATI Radeon 4550 - Partial Success

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, May 02, 2011 at 06:38:58PM -0400, Sébastien Gauthier wrote:
>    Hello,
> 
>    I was able to successfully passthrough my ATI Radeon 4550 VGA to a HVM
>    Windows 7 guest.
>    However, after installing ATI/AMD latest Catalyst drivers, I get a BSOD on
>    reboot.
> 
>    Here are the steps I've followed to get there :
> 
>    Motherboard : Intel DQ45CB (with VT-d support)
>    CPU : Intel Core 2 Duo E8400 3.00 Ghz (with VT-d support)
>    Dom0 OS : Debian 6 Squeeze 64-bit
> 
>    1- Install Debian stock Xen Kernel with Dom0 support (2.6.32-5) :
>    apt-get install linux-image-2.6-xen-amd64
> 
>    2- Install Xen required packages
>    apt-get install bcc bin86 gawk bridge-utils iproute libcurl3
>    libcurl4-openssl-dev bzip2 module-init-tools transfig tgif texinfo
>    texlive-latex-base texlive-latex-recommended texlive-fonts-extra
>    texlive-fonts-recommended pciutils-dev mercurial build-essential make gcc
>    libc6-dev zlib1g-dev python python-dev python-twisted libncurses5-dev
>    patch libvncserver-dev libsdl-dev libjpeg62-dev iasl libbz2-dev
>    e2fslibs-dev git-core uuid-dev ocaml libx11-dev bison flex ocaml-findlib
>    gcc-multilib xz-utils
> 
>    3- Download and extract Xen 4.1.0 (Current stable version)
>    cd /usr/src/; wget
>    [1]http://bits.xensource.com/oss-xen/release/4.1.0/xen-4.1.0.tar.gz
>    tar xvzf xen-4.1.0.tar.gz
> 
>    4- Apply Mr. Wei Huang's patch (with dynamic detection of BARs) to Xen
>    4.1.0 source code
>    cd /usr/src/xen-4.1.0/tools/ioemu-qemu-xen; touch patchATI.txt
>    (Copy paste in file patchATI.txt, code found here :
>    [2]http://xen.markmail.org/download.xqy?id=l7rw7d62lj27rzei&number=1 )
>    patch -p1 < patchATI.txt
> 
>    5- Compile and install Xen
>    cd /usr/src/xen-4.1.0
>    make xen
>    make tools
>    make stubdom
>    make install-xen
>    make install-tools PYTHON_PREFIX_ARG=
>    make install-stubdom
> 
>    6- Change default script for grub menu to 20_linux_xen :
>    cd /etc/grub.d/; mv 10_linux 50_linux
> 
>    7- Modify /etc/default/grub following entry to a functionnal kernel/xen
>    combo (In my case it was entry 2 (Skipped 0 and 1 which were automatically
>    created with file xen-syms-4.1.0 and didn't boot) :
>    GRUB_DEFAULT=2
> 
>    8- Use pciback to hide VGA (01:00.0 for my box, lspci -v) from host OS (In
>    my case, I had to hide and passthrough ATI audio device (01:00:1) as well)
>    - Note that Dom0 won't have access to VGA adapter anymore after reboot :
>    GRUB_CMDLINE_LINUX="xen-pciback.permissive
>    xen-pciback.hide=(01:00.0)(01:00.1)
>    pci=resource_alignment=01:00.0;01:00.1"
> 
>    9 - To apply changes made during steps 6, 7 and 8
>    update-grub
> 
>    10- Add this line to your /etc/fstab :
>    none            /proc/xen       xenfs   defaults        0       0
> 
>    11- Add this module to your /etc/modules file :
>    xen-evtchn
> 
>    12- Reboot, then start Xend (using SSH obviously)
>    reboot
>    /etc/init.d/xencommons start
>    /etc/init.d/xend start
> 
>    13 - Make sure you have following settings in your guest VM config (I've
>    only tried passthrough with a preinstalled Win7 guest for the moment, I
>    didn't try to go through the whole installation process yet) :
>    gfx_passthru=1
>    pci=[ '01:00.0', '01:00.1' ]
> 
>    14- Start VM with your fingers crossed
> 
>    At this point, I see Windows 7 boot screen, then login screen. After
>    installing latest ATI/AMD drivers and rebooting, I get a BSOD.
> 
>    Hopefully it can help some people getting the initial Xen VGA passthrough
>    setup done.
>    As far as I know, this patch only works with fairly recent ATI adapters.
> 
>    I'm not a Xen expert in any way, so let me know if you have any idea about
>    what's missing or what would be the next troubleshooting steps.
> 

You might need to apply some custom patches for your hardware.
Did you see the posts on xen-devel from amd/ati engineers?
They've worked on Xen VGA passthru recently..

-- Pasi


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