Re: [Xen-devel] Qestion to gfx-passthrough to HVM linux domU

[Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>]

Hi Timothy,

Am 27.01.2010 schrieb Timothy J. Moore:
> Hi Dietmar,
> 
> Your card does not support FLR, but it should still work - the 1 time and 
> then Dom0 will need rebooting to reset the VGA card.

I never see the boot loader screen, not either after a dom0 reboot and starting 
the domU.

> 
> Sometimes TEXTMODE on the VGA does not work, then kdm loads with VGA mode and 
> you see DomU gfx. Ok!

Yes, this is what I see.

> Try creating a Serial port in DomU and using minicom etc in Dom0 (or via SSH 
> to Dom0) and debug via the Serial port.
>
I have access via a serial console in domU and the "xm console ..." in dom0.
 
> Which patches did you apply?

xen-vBAR-pBAR.patch
qemu-change-for-vBAR-pBAR.patch
qemu-change-for-vBAR-pBAR.patch
parts of xen-load-vbios-file.patch
parts of xen-gfx-passthrough-v2.patch

I use SLES11 SP1 Beta2 with a xen-4.0.0-pre version.

Dietmar.

> 
> Tim
> 
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Dietmar Hahn
> Sent: 27 January 2010 12:46
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] Qestion to gfx-passthrough to HVM linux domU
> 
> Hi list,
> 
> I try to get gfx-passthrough on a laptop. I inserted some patches from
> Weidong Han and I'am able to passthrough the primary card (the only gfx
> card) to the domU (Linux HVM). To connect to the domU I use the serial 
> console.
> I boot the domU but can't see the boot loader (grub) screen.
> Later the kernel messages are printed (not on every boot!).
> I can start X11 on the console (with the passthroughed card) and see the
> kdm screen on the console.
> If I read the vga-bios from /dev/mem within the domU it's the same as
> in dom0.
> My questions:
> Where to search for the missing boot console messages?
> Has this to do with the FLR?
> How can I debug this?
> 
> gfx: VGA compatible controller: nVidia Corporation G96M [Quadro FX 770M]
> 
> Thanks.
> 
> Dietmar.
> 
> 
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