Re: [Xen-users] ATI VGA Passthrough / Xen 4.2 / Linux 3.8.10

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 05/05/2013 04:42 PM, Gordan Bobic wrote:
> This problem continues to drive me nuts - not by it flat out not
> working, but by working _intermittently_.
>
> For the past week, I had not managed to get ATI VGA passthrough to boot
> up once (BSOD every time). I was tweaking some boot parameters, and at
> one point it not only booted up without BSOD-ing, it actually managed
> full screen 3D applications, and completed a full GPU benchmark pass of
> Crysis!
>
> So just to make sure, I did a full shutdown and cold-booted the machine
> again - BSOD after BSOD after BSOD.
>
> Rebooted it again, and now it works again, including full screen 3D
> switching.
>
> One thing I have established is that pci=resource_alignment=<id>;<id>
> kernel boot parameter makes the machine not boot at all. It looks like
> it wipes out the NIC by realigning things, and I need the NIC to work
> because the machine runs on NFS root (and the VM disk is an iSCSI share).
>
> Has anybody got any suggestions on how I might debug this any further?
> It's really quite annoying having this _almost_ working. It also looks
> like if it works once, it will continue working upon guest restarts.
Another observation - when it boots up, and I "eject" the ATI card from 
the guest, all that does it switch the guest display briefly to VNC 
primary, followed by slightly corrupted output switching back to the ATI 
card. And it is still responsive after that, I can execute a normal 
shutdown, don't have to do it blind.
Gordan


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