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

[Gordan Bobic <gordan@xxxxxxxxxx>]

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.
Gordan

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