[Xen-devel] RE: Help needed on gfx-passthrough

["Han, Weidong" <weidong.han@xxxxxxxxx>]

There is a wiki page for xen gfx passthru: 
http://wiki.xensource.com/xenwiki/XenVGAPassthrough. pls read it.

I didn't try your gfx card. As you know, some vbios of nVidia gfx cards have 
vbios re-execution issue, which results in no display in VGA mode. You can have 
a try with loading vbios from file and make vBAR = pBAR. You can find the 
corresponding patches in xen-devel mailing list.

Regards,
Weidong


-----Original Message-----
From: Dietmar Hahn [mailto:dietmar.hahn@xxxxxxxxxxxxxx] 
Sent: Thursday, March 18, 2010 5:29 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: Han, Weidong
Subject: Help needed on gfx-passthrough

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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