Disable Intel IOMMU by default in kernel-3.1.5-7

[Adam Jackson]

On Sat, 2011-12-17 at 08:08 -0600, Bruno Wolff III wrote:

> Does this affect the ability of hostile firewire devices to be able to
> access memory of a running system?

If you were hoping to use the IOMMU to protect you from hostile firewire
devices, then you'll need to turn it on explicitly now.  (I don't
actually know if the IOMMU support _does_ protect you from that case
though.)

- ajax