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

[Jens Krehbiel-GrÃther <xen@xxxxxxxxxxxxxxxxxx>]

Hi!

Am 04.06.2010 08:14, schrieb Huang2, Wei:
> Normally AMD will release a common BIOS module/interface to OEM vendors, who 
> then cherry-pick features to fit their products. I will be surprised if AMD 
> specifically disables IOMMU feature for ASRock.
>
> Andre Przywara's email tells how to find out the IOMMU support in system 
> (device 0:0.2 and ACPI IVRS table). Please follow it and tell us your findings.
Here is the output:

ls /sys/firmware/acpi/tables/IVRS
not possible because there is no IVRS in this directory. The only files 
there are: AAFT  APIC  DSDT  dynamic/  FACP  FACS  HPET  MCFG  OEMB 
SRAT  SSDT
lspci -d 1002:5a23
There is no device with this id.

The output of the kernel at boot time is:
root@xen-01:~# dmesg |grep -i iommu
[    0.000000] Please enable the IOMMU option in the BIOS setup
[    0.817689] PCI-DMA: using GART IOMMU.
[    0.817691] PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture
root@xen-01:~#


So this means that there is really no IOMMU support on this mainboard?

>  From our side, we will contact BIOS team to find out the truth. In the 
> meanwhile, it is necessary to compile a list of 890FX motherboards, which 
> support IOMMU, in Xen wiki. So people won't find a surprise in future.
I will be glad to see this list. Hope that there will be a few 
mainboards where it is possible to use IOMMU.
Jens

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