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[159.2.239.150]) by smtp.gmail.com with ESMTPSA id af79cd13be357-93b7821dcfesm208481285a.18.2026.09.16.05.48.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Sep 2026 05:48:49 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1x6p4D-000000099Zm-0Jbp; Wed, 16 Sep 2026 09:48:49 -0300 Date: Wed, 16 Sep 2026 09:48:49 -0300 From: Jason Gunthorpe To: Alexey Kardashevskiy Cc: x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-crypto@vger.kernel.org, linux-pci@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Sean Christopherson , Paolo Bonzini , Andy Lutomirski , Peter Zijlstra , Ashish Kalra , Tom Lendacky , Herbert Xu , "David S. Miller" , Bjorn Helgaas , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , Marek Szyprowski , Robin Murphy , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. 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Sampat" , Scott Soule Cheloha , Ackerley Tng , Fuad Tabba Subject: Re: [RFC PATCH kernel 10/17] x86, dma: Allow accepted devices to map private memory Message-ID: <20260916124849.GD3196566@ziepe.ca> References: <20260916115159.1938195-1-aik@amd.com> <20260916115159.1938195-11-aik@amd.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260916115159.1938195-11-aik@amd.com> On Wed, Sep 16, 2026 at 09:51:50PM +1000, Alexey Kardashevskiy wrote: > bool force_dma_unencrypted(struct device *dev) > { > /* > - * For SEV, all DMA must be to unencrypted addresses. > + * Require unencrypted DMA unless the device has been "accepted", > + * enabled by a TSM driver to DMA to private encrypted memory. > */ > if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT)) > - return true; > + return !__device_cc_accepted(dev); I want this out of arch code, after Aneesh's recent rework Nicolin is trying this approach: https://lore.kernel.org/all/abddd433493324a6bfdf8ba9710e96d90f0d1ccc.1789010941.git.nicolinc@nvidia.com/ Jason