Re: I cannot get any message from domU by console / pv_ops domU kernel crashes with xen_create_contiguous_region failed

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

> A also can't seem to pass devices through (unless I'm doing it wrong). 
> When trying to pass my soundcard do the domU, it appears to be 
> appropriately hidden from dom0 via xen-pciback.hide kernel param 
> (/var/log/messages says 'pciback 0000:00:1b.0: seizing device') but when I 
> try to start my domU with iommu=soft and pci=["00:1b.0"] I get a dozen or 

You are doing it right.

> so "BUG: scheduling while atomic" messages w/ call traces.  My domU 
> eventually starts up ok, but lspci returns with no output.

Hmm, I wonder if this patch is in your tree:

commit 1aa61698354ca0582b07eb865e0432a13b459f11
Author: Ian Campbell <ian.campbell@citrix.com>
Date:   Thu Dec 17 14:08:25 2009 +0000

    xen: fix hang on suspend.

and causing this (or maybe the pciback driver is the culprit and
the above patch exposes a bug?).

Try reverting that patch and seeing what happens. I the meantime let
me compile a new Dom0 with the above mentioned commit and see if I get
the failure too.