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[Xen-devel] Re: IOMMU support for xen in BIOS of AMD based HP DL385g7 an

To: "M. Schneider" <ms@xxxxxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Re: IOMMU support for xen in BIOS of AMD based HP DL385g7 and kernel 3.0.0-rc7
From: "Roedel, Joerg" <Joerg.Roedel@xxxxxxx>
Date: Wed, 20 Jul 2011 14:45:48 +0200
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Hi Mark,

On Sun, Jul 17, 2011 at 06:34:33AM -0400, M. Schneider wrote:
> Please allow me one question about IOMMU support in AMDS's 890FX chipset 
> and 6176SE CPUs used in HP DL385g7 servers. These chips support IOMMU as 
> far as I know. BIOS of HP DL385g7 doesn't currently offer an IOMMU flag.
> I have contacted already HP support due to this missing BIOS setting 
> options but less or more my request has been ignored (no solution and no 
> plans for solving of this important issue  yet) so I am looking for a 
> workaround as IOMMU support is required for passing thoruhg of PCI 
> devices to domU domains (xen 4.0 / 4.1).

I am sorry but if there is no IVRS table there is not much we can do.
The IVRS table contains the information which device uses which
request-ids. Without this information the IOMMU can not work reliably.



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