[Xen-users] iommu=pass-through broken?

[Gordan Bobic <gordan@xxxxxxxxxx>]

I'm trying to use dom0 DMA pass-through (i.e. without IOMMU 
translation), and I can't seen to get it to work. According to this:
http://wiki.xen.org/wiki/VTd_HowTo

the required incantation is iommu=pass-through

But even though I added that to the command-line:
(XEN) Command line: noreboot dom0_vcpus_pin iommu=pass-through 
iommu_inclusive_mapping=1 loglvl=all guest_loglvl=all unrestricted
_guest=1 msi=1

xl dmesg shows:

(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.

How do I enable this?

Gordan

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