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Date: Tue, 23 Aug 2011 21:18:02 -0700
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Subject: Re: [gentoo-user] CONFIG_IOMMU_SUPPORT???
From: Hilco Wijbenga <hilco.wijbenga@gmail.com>
To: gentoo-user@lists.gentoo.org
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On 23 August 2011 20:38, Mark Knecht <markknecht@gmail.com> wrote:
> Hi all,
> =C2=A0 Can someone point me toward somehow enabling CONFIG_IOMMU_SUPPORT?
> It is apparently a kernel config option no required by
> virtualbox-drivers but I'm not finding it in the 3.0.3 kernel. I
> suspect there's something else I need to enable before this option
> becomes available? Unfortunately I haven't been able to Google what I
> need to do to find it.
>
> Thanks,
> Mark
>
> * Messages for package app-emulation/virtualbox-modules-4.1.2:
>
> =C2=A0* =C2=A0 CONFIG_IOMMU_SUPPORT: =C2=A0 =C2=A0 =C2=A0 is not set when=
 it should be.
> =C2=A0* Please check to make sure these options are set correctly.
> =C2=A0* Failure to do so may cause unexpected problems.
> <SNIP>
>
> k2 linux # cat .config | grep IOMMU
> CONFIG_GART_IOMMU=3Dy
> # CONFIG_CALGARY_IOMMU is not set
> CONFIG_AMD_IOMMU=3Dy
> # CONFIG_AMD_IOMMU_STATS is not set
> CONFIG_IOMMU_HELPER=3Dy
> CONFIG_IOMMU_API=3Dy
> # CONFIG_IOMMU_DEBUG is not set
> # CONFIG_IOMMU_STRESS is not set
> k2 linux #

I noticed the same. There does not appear to be any such option but
luckily its absence does not appear to affect running VB at all.