Re: [Xen-devel] PCI passthrough for domU allocated with more than 4G memory

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Sep 03, 2012 at 06:25:37PM +0200, Daniel Di Giacomo wrote:
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> Same problem here.
> I'm using gentoo with kernel 3.5.3 (gentoo-sources) and XEN 4.1.2 as dom0.
> DomU is also gentoo with the same kernel version.
> When I assign more than 4G memory to this domU, the memory for the
> passed-through Intel-gigabit-nic cannot be allocated and the
> initialization of the device fails.
> With 3968M memory assigned everything works fine.
> Assigning 8GB RAM to domU works without any problems, when I use the
> old kernel-version 2.6.34 (xen-sources) in domU.
> 

I think you need Xen 4.2 and e820_host=1 option.

-- Pasi


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