Re: [Xen-devel] IOMMU and AMD 890fx

["Joop Boonen" <joop_boonen@xxxxxx>]

The ASRock 890FX Deluxe3 doesn't support the IOMMU technology too.
http://forums.amd.com/forum/messageview.cfm?catid=383&threadid=134410

I'm very disappointed that main board manufacturers don't enable all
features for the processor and main board.


On Thu, June 3, 2010 10:19 am, Sander Eikelenboom wrote:
> Thx for the forum threads, i have changed the wiki about vt-d/iommu to
> reflect these new experiences.
>
> I was hoping AMD would be able to do a better job than Intel, and have
> learned from the BIOS missery Intel has with there VT-d, and instruct/help
> the manafacturers getting their bioses right.

I have a feeling that it's not AMD but the main board manufacturers who
don't enable IOMMU in the BIOS. (It might be a hidden feature, for people
who want to hack the BIOS at your own risk).
http://www.rebelshavenforum.com/sis-bin/ultimatebb.cgi

> It's a pity that a nice feature isn't supported. No sense in upgrading my
> setup then to a six core and mobo with IOMMU. :(
>
>
> --
> Sander
>
>
>
>> Gigabyte motherboards don't support IOMMU:
>> http://forums.tweaktown.com/f69/ga-890fxa-ud5-iommu-bios-switch-39801/
>
>> MSI boards have the same problems:
>> http://comments.gmane.org/gmane.comp.emulators.xen.user/58630
>
>> ASUS Crosshair IV Formula has IOMMU, but I cannot find if it works with
>> Xen.
>
>
>
>
>> On Sun, May 9, 2010 at 11:38 PM, Sander Eikelenboom
>> <linux@xxxxxxxxxxxxxx>wrote:
>
>>> Hello Wei,
>>>
>>> I hope motherboard manufacturers do a better job with supporting this
>>> iommu
>>> in the bios than they did with intel's. Especially Asus made a mess of
>>> it,
>>> and hasn't fixed it in newer bioses for multiple motherboards.
>>> And since all motherboard reviews don't mention nor test the iommu it's
>>> hard to know upfront if it's supported :-(
>>>
>>> --
>>>
>>> Sander
>>>
>>> > Leonardo,
>>>
>>> > 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.
>>>
>>> > -Wei
>>>
>>> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:
>>> xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Leonardo Prosperi
>>> > Sent: Sunday, May 09, 2010 1:02 PM
>>> > To: xen-devel@xxxxxxxxxxxxxxxxxxx
>>> > Subject: [Xen-devel] IOMMU and AMD 890fx
>>>
>>>
>>> > Hi,
>>> > All the reviews for the AMD 890fx chipset reported that it supports
>>> IOMMU
>>> v1.2.
>>> > But I cannot find any mention of that on AMD site.
>>>
>>> > Does 890fx support IOMMU?
>>> > Do 890fx motherboards with IOMMU exist?
>>> > Does Xen support 890fx?
>>>
>>> > Regards,
>>> > Leonardo
>>>
>>>
>>>
>>>
>>> --
>>> Best regards,
>>>  Sander                            mailto:linux@xxxxxxxxxxxxxx
>>>
>>>
>
>
>
> --
> Best regards,
>  Sander                            mailto:linux@xxxxxxxxxxxxxx
>
>
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>



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