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[Xen-devel] AMD 890FX and IOMMU

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] AMD 890FX and IOMMU
From: Jens Krehbiel-Gräther <jens.krehbiel-graether@xxxxxxxxxxxxxxxxxx>
Date: Mon, 31 May 2010 15:42:07 +0200
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Hi!

I don't know if this hardware information is off topic, but at 9th of may "Huang2, Wei" wrote a mail to this list with the information that the AMD 890FX chipset supports IOMMU.

"Huang2, Wei":
I can confirm that AMD 890FX supports IOMMU v1.22. It was briefly mentioned by external sites, such as http://techreport.com/articles.x/18825. It looks like Asus, Gigabyte and MSI will ship motherboards with 890FX chipset. Xen 4.0 fully supports AMD IOMMU v1.2. Note that IOMMU needs support from BIOS (ACPI IVRS table). Please pay a bit attention to this area.

Now the 890FX is released and I bought a board just for testing/using this feature (ASrock 890FX Deluxe3). But for my frustration there is no option to enable iommu support in the bios.

Support of ASrock tells me that the 890FX do not support IOMMU.

I searched the internet and found several information that it supports it, but on AMD websites is nothing about it.

Can anyone tell me a manufacturer and model of a mainboard which supports IOMMU??

I know that the server chipset SR56XX support IOMMU and they are almost identical.

So my question is: Is there anyone who has a board with 890FX chipset with working IOMMU support?

Regards,
  Jens

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