Re: [Xen-users] radeon/radeonhd issues with xen domU

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Nov 16, 2009 at 10:34:32PM -0500, Dan McClung wrote:
> I have been trying to export my ATI HD4350 graphics card to a domU. 
> 
> The device is blocked in Dom0 using pciback along with a few other
> devices and is visible in DomU. All other pci devices work fine. 
>

So you have a PV domU? I think all the people who have gotten VGA/Graphics
passthrough working have been using HVM guests with custom patched Xen.

Also you should be aware that passing through VGA/graphics adapter is
not as simple as normal PCI device.

VGA/Graphics adapters have other stuff than "just the PCI device".. 
like legacy io-ports and memory ranges. Those need to be passed through aswell.
And the VGA BIOS needs to be executed in the guest.. which can be
difficult (or even impossible) in a PV guest..

So it might (and will) require extra patches to the Xen hypervisor and
possibly dom0 kernel to make it work.

Video about Xen VGA/Graphics passthrough to HVM guest:
http://www.youtube.com/watch?v=HHUwg_zxYgw

-- Pasi

> I first tried the radeonhd driver version 1.2.5. 
> 
> The tail end of the Xorg.0.log showed the following errors:
> (--) RADEONHD(0): Detected an RV710 on an unidentified card
> (II) RADEONHD(0): Mapped IO @ 0xfdee0000 to 0xb7a8b000 (size 0x00010000)
> (II) RADEONHD(0): PCIE Card Detected
> (EE) RADEONHD(0): Cannot allocate 0 bytes of memory for BIOS image
> (II) RADEONHD(0): Query for AtomBIOS Init: failed
> (**) RADEONHD(0): Using AtomBIOS for All
> (EE) RADEONHD(0): No AtomBIOS image found but required for AtomBIOS
> based mode setting
> (II) RADEONHD(0): Query for AtomBIOS Teardown: failed
> (II) UnloadModule: "radeonhd"
> (EE) Screen(s) found, but none have a usable configuration.
> 
> Fatal server error:
> no screens found
> 
> When starting X, the display would flash 3 times. 
> 
> I tried using the radeon driver, and received the following error in the
> Xorg log:
> 
> (--) RADEONHD(0): Detected an RV710 on an unidentified card
> (II) RADEONHD(0): Mapped IO @ 0xfdee0000 to 0xb7a8b000 (size 0x00010000)
> (II) RADEONHD(0): PCIE Card Detected
> (EE) RADEONHD(0): Cannot allocate 0 bytes of memory for BIOS image
> (II) RADEONHD(0): Query for AtomBIOS Init: failed
> (**) RADEONHD(0): Using AtomBIOS for All
> (EE) RADEONHD(0): No AtomBIOS image found but required for AtomBIOS
> based mode setting
> (II) RADEONHD(0): Query for AtomBIOS Teardown: failed
> (II) UnloadModule: "radeonhd"
> (EE) Screen(s) found, but none have a usable configuration.
> 
> Fatal server error:
> no screens found
> 
> Strangely enough, installing the proprietary drivers from ATI will allow
> DomU and X to start up and some applications will function but utilities
> like flgrxinfo will error out. The end result was not stable.
> 
> Has anyone been able to get this to work? Any hints or ideas? I am
> finding mixed information on the 'export video card to DomU' issue. Some
> people are claiming success, some say it is not possible.
> 
> Any help would be much appreciated. 
> 
> General info about my system:
> 
> DomU kernel version (matches Dom0):
> Linux version 2.6.26-2-xen-686 (Debian 2.6.26-19lenny2)
> (dannf@xxxxxxxxxx) (gcc version 4.1.3 20080704 (prerelease) (Debian
> 4.1.2-25)) #1 SMP Wed Nov 4 23:23:33 UTC 2009
> 
> DomU cmdline:
> root=/dev/xvda1 ro console=hvc0 swiotlb=force quiet
> 
> xorg.conf:
> # xorg.conf (X.Org X Window System server configuration file)
> #
> # This file was generated by dexconf, the Debian X Configuration tool,
> using
> # values from the debconf database.
> #
> # Edit this file with caution, and see the xorg.conf manual page.
> # (Type "man xorg.conf" at the shell prompt.)
> #
> # This file is automatically updated on xserver-xorg package upgrades
> *only*
> # if it has not been modified since the last upgrade of the xserver-xorg
> # package.
> #
> # If you have edited this file but would like it to be automatically
> updated
> # again, run the following command:
> #   sudo dpkg-reconfigure -phigh xserver-xorg
> 
> Section "InputDevice"
>         Identifier      "Generic Keyboard"
>         Driver          "kbd"
>         Option          "XkbRules"      "xorg"
>         Option          "XkbModel"      "pc104"
>         Option          "XkbLayout"     "us"
> EndSection
> 
> Section "InputDevice"
>         Identifier      "Configured Mouse"
>         Driver          "mouse"
> EndSection
> 
> Section "Device"
>         Identifier      "ATI"
>         Driver          "radeonhd"
>         BusID           "PCI:0:1:0"
> EndSection
> 
> #Section "Monitor"
> #       Identifier      "Configured Monitor"
> #EndSection
> 
> Section "Screen"
>         Identifier      "Default Screen"
> #       Monitor         "Configured Monitor"
> EndSection
> 
> 
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