Re: [PATCH 4/4] thunderbolt: Export IOMMU based DMA protection support to userspace

[Mika Westerberg]

On Mon, Nov 12, 2018 at 04:22:25PM +0000, Mario.Limonciello@xxxxxxxx wrote:
> > +DMA protection utilizing IOMMU
> > +------------------------------
> > +Recent systems shipping with Windows 10 version 1803 or later may support a
> > +feature called `Kernel DMA Protection for Thunderbolt 3`_.  This means that
> 
> Keep in mind there will be systems that ship with Linux that enable this feature too ;)

Yes, you are absolutely right. I sometimes forgot that fact ;-)

> It might be better to make it time frame and platform  firmware oriented as it's
> entirely possible for an OEM to have a field firmware upgrade that may enable this
> functionality from the platform and allow an end user to upgrade to a sufficiently
> protected kernel or Windows OS to take advantage of it.

I agree. I will update this in the next version.