From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Lendacky Subject: Re: [PATCH v7 27/36] iommu/amd: Allow the AMD IOMMU to work with memory encryption Date: Thu, 22 Jun 2017 11:48:46 -0500 Message-ID: <379702e6-31f1-2df1-8889-3498241aea49@amd.com> References: <20170616184947.18967.84890.stgit@tlendack-t1.amdoffice.net> <20170616185459.18967.72790.stgit@tlendack-t1.amdoffice.net> <20170622105637.g7twdaae2v5eaown@pd.tnic> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20170622105637.g7twdaae2v5eaown-fF5Pk5pvG8Y@public.gmane.org> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Borislav Petkov Cc: linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Brijesh Singh , Toshimitsu Kani , linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Matt Fleming , x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Alexander Potapenko , "H. Peter Anvin" , Larry Woodman , linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Jonathan Corbet , "Michael S. Tsirkin" , kasan-dev-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, Ingo Molnar , Andrey Ryabinin , Dave Young , Rik van Riel , Arnd Bergmann , Andy Lutomirski , Boris Ostrovsky , Dmitry Vyukov , Juergen Gross , kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-ker List-Id: linux-efi@vger.kernel.org On 6/22/2017 5:56 AM, Borislav Petkov wrote: > On Fri, Jun 16, 2017 at 01:54:59PM -0500, Tom Lendacky wrote: >> The IOMMU is programmed with physical addresses for the various tables >> and buffers that are used to communicate between the device and the >> driver. When the driver allocates this memory it is encrypted. In order >> for the IOMMU to access the memory as encrypted the encryption mask needs >> to be included in these physical addresses during configuration. >> >> The PTE entries created by the IOMMU should also include the encryption >> mask so that when the device behind the IOMMU performs a DMA, the DMA >> will be performed to encrypted memory. >> >> Signed-off-by: Tom Lendacky >> --- >> drivers/iommu/amd_iommu.c | 30 ++++++++++++++++-------------- >> drivers/iommu/amd_iommu_init.c | 34 ++++++++++++++++++++++++++++------ >> drivers/iommu/amd_iommu_proto.h | 10 ++++++++++ >> drivers/iommu/amd_iommu_types.h | 2 +- >> 4 files changed, 55 insertions(+), 21 deletions(-) > > Reviewed-by: Borislav Petkov > > Btw, I'm assuming the virt_to_phys() difference on SME systems is only > needed in a handful of places. Otherwise, I'd suggest changing the > virt_to_phys() function/macro directly. But I guess most of the places > need the real physical address without the enc bit. Correct. Thanks, Tom >