From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mika Westerberg Subject: Re: [PATCH 4/4] thunderbolt: Export IOMMU based DMA protection support to userspace Date: Tue, 13 Nov 2018 12:36:16 +0200 Message-ID: <20181113103616.GQ2500@lahna.fi.intel.com> References: <20181112160628.86620-1-mika.westerberg@linux.intel.com> <20181112160628.86620-5-mika.westerberg@linux.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Mario.Limonciello@dell.com Cc: iommu@lists.linux-foundation.org, joro@8bytes.org, dwmw2@infradead.org, baolu.lu@linux.intel.com, ashok.raj@intel.com, bhelgaas@google.com, rjw@rjwysocki.net, jacob.jun.pan@intel.com, andreas.noever@gmail.com, michael.jamet@intel.com, YehezkelShB@gmail.com, lukas@wunner.de, ckellner@redhat.com, anthony.wong@canonical.com, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-acpi@vger.kernel.org On Mon, Nov 12, 2018 at 04:22:25PM +0000, Mario.Limonciello@dell.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.