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

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Message-ID: <20181113103616.GQ2500@lahna.fi.intel.com>
Date:   Tue, 13 Nov 2018 12:36:16 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Mario.Limonciello@...l.com
Cc:     iommu@...ts.linux-foundation.org, joro@...tes.org,
        dwmw2@...radead.org, baolu.lu@...ux.intel.com, ashok.raj@...el.com,
        bhelgaas@...gle.com, rjw@...ysocki.net, jacob.jun.pan@...el.com,
        andreas.noever@...il.com, michael.jamet@...el.com,
        YehezkelShB@...il.com, lukas@...ner.de, ckellner@...hat.com,
        anthony.wong@...onical.com, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] thunderbolt: Export IOMMU based DMA protection
 support to userspace

On Mon, Nov 12, 2018 at 04:22:25PM +0000, Mario.Limonciello@...l.com 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.