From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [vt-d][xen4-rc6] Hangs on startup
Date: Tue, 16 Mar 2010 19:55:38 -0400
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On Wed, Mar 17, 2010 at 12:41:50AM +0100, =C5=81ukasz Ole=C5=9B wrote:
> Hi,
>=20
> I'm trying to run xen4-rc6 with iommu=3D1 option, but it hangs during t=
he startup.

.. snip ..
> (XEN) [VT-D]dmar.c:481:   RMRR address range not in reserved memory
> base =3D bdc00000 end =3D ffffffffbfffffff; iommu_inclusive_mapping=3D1
> parameter may be needed.

Did you try that?