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Tue, 9 Sep 2025 01:52:46 +0000 From: Date: Mon, 8 Sep 2025 18:52:43 -0700 To: Alexey Kardashevskiy , , , CC: , , , Lukas Wunner , Samuel Ortiz , Bjorn Helgaas Message-ID: <68bf886bc9271_75db10029@dwillia2-mobl4.notmuch> In-Reply-To: References: <20250827035126.1356683-1-dan.j.williams@intel.com> <20250827035126.1356683-5-dan.j.williams@intel.com> <68b0fd1ac2ade_75db100a3@dwillia2-mobl4.notmuch> <68ba33dfac620_75e3100a0@dwillia2-mobl4.notmuch> <67382369-d941-48dd-92f6-8bbad7b26b60@amd.com> <68bb97518dea6_75db10067@dwillia2-mobl4.notmuch> <70c5399e-debc-48ed-a60b-e1921c111690@amd.com> <68bf77c923ff4_75e31005a@dwillia2-mobl4.notmuch> Subject: Re: [PATCH v5 04/10] PCI/TSM: Authenticate devices via platform TSM Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BY3PR04CA0020.namprd04.prod.outlook.com (2603:10b6:a03:217::25) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH8PR11MB8107:EE_|SJ5PPF8EC896901:EE_ X-MS-Office365-Filtering-Correlation-Id: b08323c9-74d1-456c-57ce-08ddef43928e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|1800799024; 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A bit hard to believe that PF0 is always expected to support passing through to a CVM. Thanks, > > > > I am losing track of your specific feedback, or what changes or being > > I've reread the thread, I wrongly assumed "tee" is used to decide whether to show "connect" in sysfs or not. I guess I was a bit tired^woverwhelmed when I made that comment, my bad. > > > > suggested here is the summary of what the spec assumptions and what the > > core supports: > > > > Spec assumptions: > > - DEVCAP_TEE on a physical function is independent of IDE cap > > Right, I just want to make sure that PF0 that manages TEE VFs does not have to have the TEE bit itself. It does. Otherwise, how do you tell the difference between a device that that only supports Component Measurement and Authentication (CMA) in isolation vs a device that support CMA *and* TDISP requests? Now, the PCI/TSM core will still attach if that PF0 device has IDE, without DEVCAP_TEE, but that support is incidental.