Re: [Xen-devel] AMD IOMMU disabled - No Perdev Intremap

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

Sunday, October 6, 2013, 1:36:33 PM, you wrote:

> Hi!

>>From other people posting to this list, I know that there has been a
> bug related to the issue described in Xen Security Advisory 36 that
> disables iommu for some AMD users like me.

What motherboard do you have ?

> However, even when passing "iommu=no-amd-iommu-perdev-intremap" it
> still disables i/o virtualisatoin. Related Xen dmesg output:

> (XEN) IVHD Error: Invalid IO-APIC 0
> (XEN) AMD-Vi: Error initialization
> (XEN) I/O virtualisation disabled

> Is there _any_ way I can fix this to make IOMMU work again? Updating
> my BIOS had no effect.

It depends if it's the north or southbridge ioapic but try using the new xen 
boot parameter:
(add it to the xen.gz line in grub)

ivrs_ioapic[0]=00:14.0

or

ivrs_ioapic[0]=00:00.1

--
Sander




> I'm using Xen 4.4 unstable from the official git. Any help is greatly
> appreciated.

> kind regards,
> F. Nölscher




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