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

["Huang2, Wei" <Wei.Huang2@xxxxxxx>]

IOMMU doesn't require CPU support. It is a feature of chipset. I think Biostart 
means SVM feature of CPU, which is supported by Phenom II.


-Wei
________________________________________
From: Joop Boonen [joop_boonen@xxxxxx]
Sent: Tuesday, June 15, 2010 4:37 PM
To: Przywara, Andre
Cc: Jens Krehbiel-Gräther; Leonardo Prosperi; xen-devel@xxxxxxxxxxxxxxxxxxx; 
Joerg Roedel; Huang2, Wei; Eikelenboom; Andrew Oakley
Subject: Re: [Xen-devel] IOMMU and AMD 890fx

I've got the following answer from Biostar in respect to the Biostar
TA890FXE main board.
http://www.biostar.com.tw/app/en/mb/introduction.php?S_ID=482

<quote>
The motherboard supports IOMMU, but the CPU you are installing also must
support IOMMU.



support@xxxxxxxxxxxxxxx
626-581-1055 menu select 2
</quote>


I've just took the risk to order this mainboard as the main board is
relatively cheap and I hope/presume the IOMMU will be supported
eventually if it's not supported yet.
I'll update you when I know the result.
I understood IOMMU is not related to the CPU i.e. IOMMU should also be
supported when the CPU on the main board is a AMD Phenom II X2 550 Black
Edition?

On 06/14/2010 03:49 PM, Andre Przywara wrote:
> Jens Krehbiel-Gräther wrote:
>> Hi!
>>
>> I now got a Asus Crosshair IV mainboard and here are the outputs
>> after I enabled the IOMMU option in the bios:
>>
>> xen-01:~# ls /sys/firmware/acpi/tables/
>> APIC  DSDT  dynamic  FACP  FACS  HPET  IVRS  MCFG  OEMB  SRAT  SSDT
>> xen-01:~# dmesg |grep -i iommu
>> [    1.691432] AMD-Vi: Enabling IOMMU at 0000:00:00.2 cap 0x40
>> xen-01:~# lspci -d 1002:5a23
>> 00:00.2 Generic system peripheral [0806]: ATI Technologies Inc Device
>> 5a23
>> xen-01:~#
>>
>> So here is the IOMMU of the 890FX. Will go further for testing now..
>
> Great news, thanks for pursuing that.
>
> For the other boards:
> We have identified an issue and are working on a solution. Stay tuned.
>
> Also please note that sometimes board vendors also call the AMD64 GART
> an IOMMU, so if you have correspondence with them, make sure you are
> talking about the same thing.
>
> Regards,
> Andre.
>




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