From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: with Xen4 config -> (pci-passthrough-strict-check
	no), DomU init reports "Error: pci: PCI Backend and pci-stub don't
	own device"
Date: Fri, 29 Jan 2010 17:44:45 -0500
Message-ID: <20100129224445.GA5852@phenom.dumpdata.com>
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> 	grep passthrough /etc/xen/xend-config.sxp
> 		(pci-passthrough-strict-check no)
> 	grep hide /etc/modprobe.d/99-local.conf
> 		options pciback hide=(0000:04:07.0)(0000:04:06.0)

That won't work. That option is only useful if pciback is compiled
in the kernel. To be exact, you would need this in your bootline
argument:
 xen-pciback.hide=(04:07.0)(04:06.0) pci=resource_alignment=04:07.0 


> 
> and checking,
> 
> 	lsmod | egrep -i "pciback|xen"
> 		pciback                54471  0
> 		xenbus_be               3474  4 netbk,blkbk,blktap,pciback

Since it is module you need to follow the documentation about how to
seize and bind using pciback. Google is your friend.