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Re: Re[2]: [Xen-devel] No VT-d with Xen 3.3/3.4rc3 on Intel-Board DQ45CB

To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: Re[2]: [Xen-devel] No VT-d with Xen 3.3/3.4rc3 on Intel-Board DQ45CB
From: Tim Kaufmann <tk@xxxxxxxxxx>
Date: Wed, 20 May 2009 23:33:16 +0200
Cc: Anthony Bosio <anthony@xxxxxxxxxx>, ""Matthias P. Würfl"" <mpw@xxxxxxxxxx>, Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
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Am 20.05.2009 um 21:38 schrieb Sander Eikelenboom:

Are you problems with VT-D and the Intel-Board DQ45CB fixed ?

Almost.

In fact, the hang occurs with RAM > 2 GB and is caused by a BIOS error. As one of the Intel guys on this list told me after several tests:

Please let me offer more technical details about the hang you suffer from: Due to the very very big and bad rmrr->end_address 0xffffffffbfffffff, in setup_dom0_rmrr() -> iommu_prepare_rmrr_dev(), intel_iommu_map_page() is invoked too too many times and you see the hang...

I already received a patch for Xen 3.4RC4 which I can properly enable VT-d with. But there'll be a BIOS-Update soon, they promised.

Tim


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