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

[Atom2 <ariel.atom2@xxxxxxxxxx>]

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:
>
> http://wiki.xen.org/wiki/VTd_HowTo
>
> 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.
KK
> 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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