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[159.2.239.150]) by smtp.gmail.com with ESMTPSA id 71dfb90a1353d-5eca8d9d62bsm4161881e0c.8.2026.11.05.06.06.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 06:06:32 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1xOy6p-00000002ezu-00ao; Thu, 05 Nov 2026 10:06:31 -0400 Date: Thu, 5 Nov 2026 10:06:30 -0400 From: Jason Gunthorpe To: Robin Murphy Cc: Greg Kroah-Hartman , Leon Romanovsky , "Rafael J. Wysocki" , Danilo Krummrich , Dmitry Torokhov , Andrew Lunn , Heiner Kallweit , Russell King , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Johannes Berg , Jonathan Corbet , Shuah Khan , Randy Dunlap , Bjorn Helgaas , "Joerg Roedel (AMD)" , Suravee Suthikulpanit , Vasant Hegde , Will Deacon , David Woodhouse , Lu Baolu , Johan Hovold , Eric Dumazet , Marcel Holtmann , Luiz Augusto von Dentz , Nipun Gupta , Nikhil Agarwal , Pieter Jansen van Vuuren , linux-kernel@vger.kernel.org, driver-core@lists.linux.dev, linux-input@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-usb@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, iommu@lists.linux.dev Subject: Re: [PATCH 10/17] driver core: Expose device trust authorization through sysfs Message-ID: <20261105140630.GG3889730@ziepe.ca> References: <20261105-device-trust-core-v1-0-1e536825b4eb@nvidia.com> <20261105-device-trust-core-v1-10-1e536825b4eb@nvidia.com> <2026110514-bunkhouse-handset-6a3a@gregkh> <20261105132729.GB8298@unreal> <2026110535-engulf-precut-cf10@gregkh> <9d896ebb-6892-4cac-a7c5-41def47f0be0@arm.com> X-Mailing-List: linux-kernel@vger.kernel.org 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: <9d896ebb-6892-4cac-a7c5-41def47f0be0@arm.com> On Thu, Nov 05, 2026 at 01:59:20PM +0000, Robin Murphy wrote: > Yup, and that's true even in the PCI TDISP case - there's a major amount of > "communication" and "configuration" involved in that. The principle which > should (hopefully) generalise is that a bus/host controller driver can > always interrogate its child device to perform whatever attestation and > general configuration is appropriate, but we won't hand off any _control_ of > that device to a specific device driver (nor enable potentially-impactful > bus-level features like DMA, interrupts, etc. if relevant) without the > requisite agreement between the bus code and the user. +1, I think that captures the idea very well. Jason