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Re: [Xen-users] i7 and vt-d

To: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] i7 and vt-d
From: Christoph Kaminski <mangel@xxxxxx>
Date: Sat, 23 May 2009 19:00:00 +0200
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Yep it works but I have some strange msgs in xm dmesg:

(XEN) I/O virtualisation enabled
(XEN) I/O virtualisation for PV guests disabled
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid
(XEN) [VT-D]iommu.c:1269:d32767 domain_context_mapping:invalid

What does it mean?

Greetz

Guido Hecken schrieb:
Try kernel-parameter iommu=1 in your dom0 boot-script.
something like this:

kernel /xen-3.3.1.gz console=vga dom0_mem=512M iommu=1
In older xen-versions vtd=1 did the same.
This option seems to be not so well documented...
It took me some hours to find and hopefully understand them.

Good luck,

Guido

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