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

Am 11.09.13 01:36, schrieb Gordan Bobic:
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:


the required incantation is iommu=pass-through
I think I remember that, for consistency's sake with other parameters, the option's name was changed to "dom0-passthrough" at some time.

It might make sense to do a grep on your (uncompressed) xen-kernel and see whether you can find the string "pass-through" in your binary. For my kernel (xen-version is 4.2.2) I couldn't find any occurenec of "pass-through" but rather only "dom0-passthrough" which seems to confirm my suscpicion.


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?


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