From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: pvops acpi and xen 4  issues
Date: Mon, 1 Mar 2010 11:13:36 -0500
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> > Can you boot the same kernel natively?  I'm interested to see 
> > /proc/interrupts; it appears you have the ACPI SCI interrupt on irq 20, 
> > which is unusual (its usually 9).  Also, does it boot correctly natively 
> > with the DMAR enabled?  Some drivers are still broken.

Wait a minute, this looks painfull similar to this issue:
http://lists.xensource.com/archives/html/xen-devel/2010-02/msg00715.html
..
> PCI: Using configuration type 1 for base access
> 
> bio: create slab <bio-0> at 0
> 
> ACPI: SCI (IRQ20) allocation failed
> 
> ACPI Exception: AE_NOT_ACQUIRED, Unable to install System Control
> Interrupt handler 20090521 evevent-161
> 
> ACPI: Unable to start the ACPI Interpreter

where a patch from upstream fixed the problem.