[gentoo-user] CONFIG_IOMMU_SUPPORT???

[Mark Knecht <markknecht@gmail.com>]

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 #