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

[Ferdinand Nölscher <ferdinand@xxxxxxxxxxx>]

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.

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.

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

kind regards,
F. Nölscher

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