[Xen-devel] Help needed on gfx-passthrough

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>]

Hi list,

I try to get gfx-passthrough on a laptop:
Intel PM45 Express chipset with extern nvidia craphics card G96M [Quadro FX 
770M]
I can't see the bios boot messages and also not the grub boot loader.
The domU linux boot messages appear on the screen.

For me it looks like the vgabios gets not started or works not well.
In the domU I can read the vgabios from /dev/mem and it's the same as in dom0.
If I change the hvmloader to use the standard vgabios from firmware/vgabios
I see the bios and grub boot messages.

I added some tracing to qemu-dm (pt_*read/write and pci_*read/write) to see
accesses to the emulated chipset and graphics card but I can see no difference
between using the original vgabios or the emulated vgabios within the hvmloader.

Now my question: how can I debug this problem. How can I see whether the vgabios
gets started and initialises the graphics card? 
I'am not fit enough in this area and documentation is very rare!
Thanks in advance!

Dietmar.

-- 
Company details: http://ts.fujitsu.com/imprint.html

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