From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.222.45 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793887594; b=4wvdROB4DuAvATH9aKKIY043MzpiqMMlLLpr9V4iBqBM70qlKU6PggFhEWfZqAwXUPMP yFJIQCbWUSbU+zMiuk/03prH5aGer2z1D7rHwqvUB+EGuH6uQ08MV4w36sHTJClHpLR09 IFBhbWNVMsS9eZxsSAQ15++Vx4ixV1M1H487BI2/cK25LNpVD0z6i0eB9cWXm3tWZJfA/ xp9Z0LdfO+doNc2xvDnMyl6PD81bSqhHvR1KIFFRbvM0/5w1LA5cM8sRsZq44NDeRzRTY ZJgNxwOVL+iXEB9+c7pzl7ZtaL8hOzaziLOBnILNEGohoCLhg1GrqCSdlefgzAQt3yg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793887594; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Gm-Gg:X-Received:Received: Received:Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; bh=+bxiPLBqzkOz0GIdUWUmBLaUitvgttuw9ZH2qvbUZkg=; b=vf/d33tYtxtx+3qoQzWwFsepsSFHLOqzUwv/6BkBScGDaPLwq/o4lqAFW35m/mfEVtWd w1j8Ye7uO9cNHAJxpgCARbWn7CSJskIJsXcb9LixaUiaTwhZk1YUM4Q1nJODH3lcSja9g tMHfCktk4tsNCXZFfa133NtisEPvkCsVmrULA/MAQ5c/fQ2g+BNGKQyVKNSlQbnIpMR1z AAQHoSY32jWM4NbYHRKpbCuG8fOjB9qqOffEcTSCMZffvsWz5XFGgkWquD8WvEy0gH35k XMFR9F9H2S1xoGJP5Wn4vkeV12rAhrU8/2xYZbKLDsxDdGZmpohgcXcQvDa9HIMFraw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none header.from=ziepe.ca; spf=pass smtp.mailfrom=ziepe.ca; dkim=pass header.d=ziepe.ca header.i=@ziepe.ca header.a=rsa-sha256 header.s=google header.b=RnR9WnLw; arc=none smtp.remote-ip=209.85.222.45 Received: from mail-ua1-f45.google.com (mail-ua1-f45.google.com [209.85.222.45]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09D05606A33D for ; Thu, 5 Nov 2026 14:06:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 09D05606A33D Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ziepe.ca Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=ziepe.ca header.i=@ziepe.ca header.a=rsa-sha256 header.s=google header.b=RnR9WnLw Received: by mail-ua1-f45.google.com with SMTP id a1e0cc1a2514c-99ac154431bso113580241.0 for ; Thu, 05 Nov 2026 06:06:33 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; t=1793887593; x=1794492393; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=+bxiPLBqzkOz0GIdUWUmBLaUitvgttuw9ZH2qvbUZkg=; b=RnR9WnLw6ZCMoaFK9OfD+Z3SyEdhvj+uf0rMG8hHCJ508GqyJ6ANwZoUk4+aGiOUw2 /BkiFTe3GFbXdlDhgGNTyo1p8KbFcLTeuViDrXT0G8rPqBzVVo12Ao+p4Nr1qmRZcl61 4eaArBRyBLbC70PWW9D8DSwCjUpFcwxnrtfrVG8awSc3G2DLBl7ue9/tyD5BZlfo0PwR zdxT7MPa5WtJxCqrk+LMM1B4PGIKPha9YDx2d3ZgVPNqHnLfPw9K0SbdoIeozyBU6kJV fXJaMOJT5b2NTv+4F4NS5Cw1swAwWPhfu1r6zxddYwAc/lzTbX1ed12Z3pRWm4FFq8m7 OBcQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793887593; x=1794492393; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=+bxiPLBqzkOz0GIdUWUmBLaUitvgttuw9ZH2qvbUZkg=; b=tB+xL2qBySWPFqGn9o7tb9zf8lotPeIUUxYrmNFW0YV0tWS+KGiERKj/4HDcXhFlam mtq+7s7cfVG9CO8UR8rxVl0bugDlM16s5QubBAu+51w5WUWQgsEZoXFdGA371JUaJabV vNPn+5C6xCjdTE8aSjasiNk+2mGcZXAGuvIKV26kkfdyTFJCUDgC/sFSv9l5ncm0cbba Z3UyjQ2wNeyfWUNEF+0d62+OfoaPvoaPRcZsukaQpvbID93RBPJ3Qg1sPZWNztuugIW7 aRGGsWAz1OAGa8oStoeO5dXctpS8znTIIrUSka3FCNacKTC75QNFqAh8M5i2yaSOvSAu 7AQw== X-Forwarded-Encrypted: i=1; AKwUvBwnpNud6dFL2X3T7I2Fsnp4eV6PHm7SVGMaHqddUwOrSattO2kKenqcsimhD0YJrV22rh1Mj3c=@vger.kernel.org X-Gm-Message-State: APuU4Z8ydOLYJUkgrWC0SE27gqD1m4ThHS9fLyeTtiLayqU7H4oeGnWy 9f5lao9/XxzCZcTqrr97CopOjQu2voYgLBCiE53BNPOORi6NBQqzzcWwfWQK/Dgmhuk= X-Gm-Gg: AYBFou36BQo1HfThyPiR5jhaxCZtEe3aAxbsJoxPffapxCRzodK+gaBwXEs+WkWWn8p eTxZ6gtcs0SdDKtVQoNlAkmGJkUfWzlJg3ezes8jqSHT4W/StTJX9A+1io8PYtlqk8qgGwY3+k6 EEdyzsFe/Bn5pcCoKu7ZrJARF5wUN7tvXUpoRVNaKgphu+9EbA8NtpPSHYtzhc4AU4tDZS2WYzl Tvm9KK9m8pyREJuXbsl8efgmrmRr9YGhpfSz0gWzcpS/ioAyU6er66QUXKDfSZvkrKtgN3f0JwJ IpqyCbRJOE8LtYnModul+ndz/DLMHEjXaGCcJpdT5pQdCFHB5tXjQ6g50p1LQwJotJ+kzW5k+Du JNvfOA7wwXl8ahfDShkIEiaFI3PABO5Mx47SFze9iqHbzw/+56fJ5UzDZiYyEAg74LcR3tABLNx jjixGvs2yshxyXdVlm2uIJgJwtoLZOs4fgSho/11GJuHJd9qG3lYW3Irjzh1nzEOLuYZMDmNRTE XoC3dtiL9rhLSWBN60viEkTbwCPcf7sKjoB1nCmy8256seHST43s4Ab36VcCTtRNaue4I2OJOZE tiR/0dF4btXAYDxRh44hxzN9n08oxkXHUQgI8ITkAqcZlyaL0xcs17tDvbBMSO2CLshlefPe2Ud 1nyyIaZpeaQ== X-Received: by 2002:a05:6122:4f9f:b0:5ea:389c:51fe with SMTP id 71dfb90a1353d-5ec68949c50mr9274698e0c.17.1793887592873; Thu, 05 Nov 2026 06:06:32 -0800 (PST) Received: from ziepe.ca (hlfxns010zw-159-2-239-150.pppoe-dynamic.high-speed.ns.bellaliant.net. [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: netdev@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