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Fri, 30 Oct 2026 06:44:44 -0700 (PDT) Received: from localhost ([208.127.45.21]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c4cabe4a7e5sm66619066b.57.2026.10.30.06.44.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Oct 2026 06:44:44 -0700 (PDT) Date: Fri, 30 Oct 2026 14:44:40 +0100 From: Jiri Pirko To: "Aneesh Kumar K.V (Arm)" Cc: linux-coco@lists.linux.dev, Kevin Tian , Alexey Kardashevskiy , Xu Yilun , Catalin Marinas , Suzuki K Poulose , Steven Price , Kiryl Shutsemau , Rick Edgecombe , Dave Hansen , Jonathan Cameron , Jason Gunthorpe , Bjorn Helgaas , Ashish Kalra , Tom Lendacky , John Allen , Will Deacon , Mark Rutland , patches@lists.linux.dev Subject: Re: [RFC PATCH v1 02/11] attestation: Filter evidence objects per instance Message-ID: References: <20261028152618.1356860-1-aneesh.kumar@kernel.org> <20261028152618.1356860-3-aneesh.kumar@kernel.org> X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261028152618.1356860-3-aneesh.kumar@kernel.org> Wed, Oct 28, 2026 at 04:26:09PM +0100, aneesh.kumar@kernel.org wrote: >Allow an attestation instance to expose only the evidence objects its >device supports. Add an optional evidence_object_supported() callback >and use it both when building DEVICE_GET capabilities and when checking >EVIDENCE_GET requests. > >The following PCI/TSM patch uses one attestation implementation for >devices that support different evidence objects. Its list includes >certificate slots 0-7, SPDM VCA, measurements, and a TDISP interface >report. Each device must expose only the objects it supports, for >example: > > Instance Supported evidence objects > ------------------------ ------------------------------------------ > Host link using slot zero Certificate slot 0 > CCA guest device Certificate slot 0, VCA, measurements, > TDISP interface report > Host PF0 after discovery Certificate slots reported populated by SPDM > >PCI/TSM checks the TSM driver's evidence_types bitmap or, after SPDM >discovery on a host PF0, the populated-slot bitmap. The preceding patch >controls whether EVIDENCE_GET is enabled; this patch controls which >objects that operation can retrieve. For SPDM slots, I think it would make sense to distinguish supported slot addresses from discovered population. DEVICE_GET describes fixed object tuples, formats and limits; SPDM_GET reports the populated slots and their certificate digests. An empty supported slot returns -ENOENT. Fixed differences between backend instances can be selected before publication. Please do not make the capability set follow a populated-slot bitmap that can change during the instance lifetime. [..]