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[47.54.130.67]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8ac849dd312sm121604836d6.9.2026.04.14.05.22.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Apr 2026 05:22:08 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wCcmO-0000000AdeU-0XZ8; Tue, 14 Apr 2026 09:22:08 -0300 Date: Tue, 14 Apr 2026 09:22:08 -0300 From: Jason Gunthorpe To: "Aneesh Kumar K.V" Cc: Mostafa Saleh , iommu@lists.linux.dev, linux-kernel@vger.kernel.org, robin.murphy@arm.com, m.szyprowski@samsung.com, will@kernel.org, maz@kernel.org, suzuki.poulose@arm.com, catalin.marinas@arm.com, jiri@resnulli.us Subject: Re: [RFC PATCH v3 3/5] dma-mapping: Decrypt memory on remap Message-ID: <20260414122208.GV3694781@ziepe.ca> References: <20260408194750.2280873-1-smostafa@google.com> <20260408194750.2280873-4-smostafa@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Apr 14, 2026 at 03:01:15PM +0530, Aneesh Kumar K.V wrote: > Mostafa Saleh writes: > > > In case memory needs to be remapped on systems with > > force_dma_unencrypted(), where this memory is not allocated > > from a restricted-dma pool, this was currently ignored, while only > > setting the decrypted pgprot in the remapped alias. > > > > The memory still needs to be decrypted in that case. > > > > For ARM CCA, we cannot mark a vmap address as decrypted. Why not? pgprot_decrypted is passed to vmap, why can't it work? Jason