Re: [gentoo-user] CONFIG_IOMMU_SUPPORT???

[Hilco Wijbenga <hilco.wijbenga@gmail.com>]

On 23 August 2011 20:38, Mark Knecht <markknecht@gmail.com> wrote:
> Hi all,
>   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:
>
>  *   CONFIG_IOMMU_SUPPORT:       is not set when it should be.
>  * Please check to make sure these options are set correctly.
>  * Failure to do so may cause unexpected problems.
> <SNIP>
>
> k2 linux # cat .config | grep IOMMU
> CONFIG_GART_IOMMU=y
> # CONFIG_CALGARY_IOMMU is not set
> CONFIG_AMD_IOMMU=y
> # CONFIG_AMD_IOMMU_STATS is not set
> CONFIG_IOMMU_HELPER=y
> CONFIG_IOMMU_API=y
> # 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.