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[159.2.239.150]) by smtp.gmail.com with ESMTPSA id ada2fe7eead31-7d26fd3e101sm4619225137.3.2026.11.05.09.02.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 09:02:04 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1xP0qh-0000000388I-28Zd; Thu, 05 Nov 2026 13:02:03 -0400 Date: Thu, 5 Nov 2026 13:02:03 -0400 From: Jason Gunthorpe To: Leon Romanovsky Cc: Greg Kroah-Hartman , "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 , Robin Murphy , 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: <20261105170203.GC663069@ziepe.ca> References: <20261105-device-trust-core-v1-0-1e536825b4eb@nvidia.com> <20261105-device-trust-core-v1-10-1e536825b4eb@nvidia.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: <20261105-device-trust-core-v1-10-1e536825b4eb@nvidia.com> On Thu, Nov 05, 2026 at 01:42:23PM +0200, Leon Romanovsky wrote: > + (RW) The requested trust policy for the device. The initial > + value may be selected by the bus before the device is > + registered; otherwise it is "default". The policy is resolved > + to an active trust level before the device is probed. > + > + The values are "default", "disabled", "adversary", and > + "full". "default" lets the bus select the active trust level. > + "disabled" prevents a functional driver from binding. For making this more general: "disabled" prevents a driver from binding and informs the kernel to provide containment of the device. For example a PCIe device should be unable to DMA to memory. > + "adversary" requests operation with the restrictions that the > + bus and DMA layers can enforce for a potentially malicious > + device; it does not isolate DMA by itself. "full" requests > + normal operation. "adversary" informs the kernel that the userspace wants to opt into any security defenses the kernel may have to restrict and further validate interactions with the device. This may have a performance or functional cost compared to "full". As an example the DMA API and IOMMU layers will avoid exposing unrelated nearby memory to the device during DMA. > + Successful resolution to an allowed level commits policy > + and operating level before driver or DMA setup. Both remain "before driver startup" > + fixed for the device object's lifetime, including through > + failed or deferred probes, unbind, reset, and driver reload. > + Later binds must resolve to the same level, including when > + the policy is "default". A resolver error or disabled result > + before commitment leaves the policy's writability unchanged. Not sure what "resolver error" is. Jason