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[47.54.130.67]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8c908e11929sm25017416d6.14.2026.05.14.07.37.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 May 2026 07:37:33 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1wNXBt-00000005Lti-0CPB; Thu, 14 May 2026 11:37:33 -0300 Date: Thu, 14 May 2026 11:37:33 -0300 From: Jason Gunthorpe To: "Aneesh Kumar K.V" Cc: Mostafa Saleh , iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, Robin Murphy , Marek Szyprowski , Will Deacon , Marc Zyngier , Steven Price , Suzuki K Poulose , Catalin Marinas , Jiri Pirko , Petr Tesarik , Alexey Kardashevskiy , Dan Williams , Xu Yilun , linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , x86@kernel.org Subject: Re: [PATCH v4 04/13] dma: swiotlb: track pool encryption state and honor DMA_ATTR_CC_SHARED Message-ID: <20260514143733.GB7702@ziepe.ca> References: <20260512090408.794195-1-aneesh.kumar@kernel.org> <20260512090408.794195-5-aneesh.kumar@kernel.org> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, May 14, 2026 at 06:18:05PM +0530, Aneesh Kumar K.V wrote: > > There is no problem with non-protected guests as they don't use memory > > encryption, my initial thought was that th encrpyted/decrypted is > > per-pool property which is decided by FW (device-tree). > > What I meant was that we need a generic way to identify a pKVM guest, so > that we can use it in the conditional above. If I understood Mostafa's remarks I think different devices in the guest need shared/decrypted and some don't? Ie a virtio hypervisor device needs shared while a real PCI device doesn't? Is that right? In CC terms that would be a mixture of T=0 and T=1 devices hardwired and signaled by firwmare.. Ideally we'd have a flow where if the arch precreates a swiotlb pool with special parameters this overrides all other decision making. Then this series is about making CC NOT use that flow... ?? Jason