Re: [Xen-users] VGA passthru troubleshooting

[Rolu <rolu@xxxxxxxx>]

On Sat, Jun 23, 2012 at 5:57 PM, Chris <kavefish@xxxxxxxxx> wrote:
> [This is a re-send since my last attempt seemed not to reach the list.]
>
> I'm trying to pass an ATI graphics adapter to either a Fedora 16 or Win7
> domU, but I'm having no luck and I'm hoping someone can help.
>
> My setup:
> - CPU: i7-2600
> - VT-d enabled in BIOS
> - ATI Radeon HD 6770
> - xen-4.1.2
> - dom0 kernel 3.4.3
> - 'iommu=force' and xm dmesg showing I/O virtualization working
> - pciback built as module
> - regular PCI passthru (of an audio device) to domU working
> - unbind radeon driver, assign and bind to pciback (in dom0)
>
> I've tried assigning gfx_passthru to either 0 or 1. In both cases, the
> domU appears to start without error. However, when using
> "gfx_passthry=1" xm reports the domain is running, but consuming all CPU
> resources and the instance seems to hang.
>
> With "gfx_passthry=0" on a Fedora VM it boots and I can use the emulated
> graphics (or ssh) to get lspci output, which shows the ATI device is
> visible. However, dmesg shows the radeon driver failing to bind:
>
> ...
> radeon 0000:00:05.0: Expecting atombios for evergreen GPU
> radeon 0000:00:05.0: Fatal error during GPU init
> [drm] radeon: finishing device
> [TTM] Memory type 2 has not been initialized
> radeon 0000:00:05.0: no bo for sa manager
> vga_switcheroo: disabled
> radeon: probe of 0000:00:05.0 failed with error -22
> ...
>
> With "gfx_passthru=0" on a Win7 VM the emulated graphics shows the
> swirling logo for a while, then a blue screen as the catalyst driver
> tries to load before boot completes.
>
> From reading xen-devel and xen-users archives this situation sounds not
> unlike what others have encountered, but I never saw a solution. Any
> help or pointers for where I can look for troubleshooting info would be
> greatly appreciated.
>

In the Linux domU, try install AMD's own driver (from
http://support.amd.com/us/gpudownload/Pages/index.aspx). I have more
luck with that one than with the kernel's default driver.

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