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Wed, 31 Jan 2024 19:50:18 +0000 Date: Wed, 31 Jan 2024 11:50:15 -0800 From: Dan Williams To: Kuppuswamy Sathyanarayanan , Nikolay Borisov , CC: , , , , Subject: Re: [PATCH] virt: tdx-guest: Deprecate legacy IOCTL-based interface for quote generation Message-ID: <65baa477b8da8_37ad29436@dwillia2-xfh.jf.intel.com.notmuch> References: <20240124093858.1818497-1-nik.borisov@suse.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: MW4PR04CA0354.namprd04.prod.outlook.com (2603:10b6:303:8a::29) 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_|PH7PR11MB7986:EE_ X-MS-Office365-Filtering-Correlation-Id: edc1a2e2-8252-4b80-b1d9-08dc2295d9c0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?4P/iIRL43CH9Tm5Kr+w+MGqiMjK5e6WK5l8tlB2xmYXEhfqB9dXzGNd3S1Jl?= =?us-ascii?Q?9f0NAdioGf54ejwagQjQgT3/NKsr1mwSXMIf4NWts8tJYDabmWR/BzaRgdGY?= =?us-ascii?Q?evwQf/ngaeQzIjNJ8fmJyeqsaXh8BErILY3JjhTkUu76uMzlXnLbSMxcZGsA?= =?us-ascii?Q?P0eZCLb9GFapmqjldBRzhHL2i7SWDBsbbAw3z2WCR9AO7VPlwyn9jqCSwE+x?= =?us-ascii?Q?i8IuPOW24oWtM2AXu5lVlt3izaFY49BUSEZHks5edOO6QhPLxukAMVVL8sb4?= =?us-ascii?Q?8fvsswmQnLqx2Dyk/+WKQ6+NlPIPNB0R4jbGKfi6kLJFyP3AnTDs3U3CW0xn?= =?us-ascii?Q?9AoE1D197+L2NrrIpRUpMBoiy8JJgGsI34N4RKGIAD9bITNTQMWT9LiM0XrS?= =?us-ascii?Q?8o7nU3cctd7CwSibVtGoBu3SPrkFanZsofmftBErxbYqS8Tw0e8EI0T1f+lN?= =?us-ascii?Q?tLM2S5FhTtOOiq3TPQAjlB08yeA/dyKQjWH6rgBUOS52HNawPZiLANuIotQf?= =?us-ascii?Q?lsUlYTY6xWt+1EuoJ5l43XXV3HfUEDZHHSw3ucZPJ8LKGLm10BHlvoHiJ04T?= =?us-ascii?Q?wOiYpH3+4vpsaGI2KbbVLl3nEirz3eLgfepKeZO8v25NDIho1Tqju5FTAEdA?= =?us-ascii?Q?poWX/XEC4AN1DzvLRwN4rfnp9dAnsEXweLVcMW6FvueGDX+rElpzEeJknqc5?= =?us-ascii?Q?x3tAkBYGUMwSgTB36aqmMZ2y7TZFM73GWb1BWVwRyJjNNwLOzqH9/YcxW1lW?= =?us-ascii?Q?DdC74GIlr+pv3iwy8iLvGRAB0bpIj3HDGFqILj/egi1gwjZtTLm3RjzLJtEk?= =?us-ascii?Q?qCDPcDG0FquphPD3SEClZp08AVRDdYzPL/EzMzAwSIsgZo70arw6dJ+Kfwg0?= =?us-ascii?Q?6VnTOFcLFk/y3SUpSSVtlAyaUr6pBxh24Oftq2XzMUZeLe0opRSmkIL+yIhl?= =?us-ascii?Q?fepGTnqex44oVWy7bPNkX0STusRQd305DgY0BaXYfllq4sTAsXpaTbIulzMe?= =?us-ascii?Q?Au/IJuo/0aHqfgnNK314bZRFttlg/KQNZoP9c8cFfqRJu5ea5oS6hpSktFm9?= =?us-ascii?Q?bqjhQmp91kEA0QoYUHW669MGWIgfTXppHmzg1Ksorr3wBshxaH2dU47I9eFV?= =?us-ascii?Q?QBZUpc2yBES10dSZOffqohNtF5QPRbCdbzs9mTuRysQlb11bH17jBMROQe3+?= =?us-ascii?Q?HbFTNglE8ibHpoLhOXp99a1z+06FpsChsCZ/v91fgTiXVsig4SdsQnRBPvBH?= =?us-ascii?Q?U2ZUrb7oq1gdQ5dY5xEl4GaWMfKfSf8JQcWmX/9+u0z7eRIoTl7Op57LRc/t?= =?us-ascii?Q?a0l1kK1n1PSbWi5MQr1QMlryKasLHm21RrP1AVUZStgodeDyfG6T+zsbz8yM?= =?us-ascii?Q?CYjk2IdkVDLVoROvEPAem/GJCIJrNSFyButtzg6WP18yrKnZkCJd8YULQYrI?= =?us-ascii?Q?nv5E7N4JSEFFMVDmMUC3iuEEZUMa9+DfF+VBWKbP7cM3yo6Gc6SsiGgh26Sr?= =?us-ascii?Q?0F5sDOKyd118r79Da5W3JMEsYY1HQe/OPwnDmJZcAGIIms41/Bh55VSfM4L4?= =?us-ascii?Q?e20yGNqYGKuWQoCWqlwQyhhOEfRB+r0yMbdmSfIM4tECqql1sgJcLkWlT/UQ?= =?us-ascii?Q?cQ=3D=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: edc1a2e2-8252-4b80-b1d9-08dc2295d9c0 X-MS-Exchange-CrossTenant-AuthSource: PH8PR11MB8107.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Jan 2024 19:50:17.9761 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Uz+6KQ8Sw/n1KXczyn/OW50/lqijkUzANCZlxE/TQLl+jMJA/IBmhBKjzZJ2F/sDhsFzJBw1g/9dkCChCmtMcZEhTyOQrLyAM8LuB3hEjVE= X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR11MB7986 X-OriginatorOrg: intel.com Kuppuswamy Sathyanarayanan wrote: > + Dan Middleton > > Hi Boris, > > On 1/24/24 1:38 AM, Nikolay Borisov wrote: > > IOCTL based interface was the natural choice for interacting with the > > quote generation machine at a time when there wasn't anything better. > > Fortunately, now we have a vendor-agnostic, configfs-based one which > > obviates the need to have the IOCTL-based interface. > > > > Gate the relevant code behind a Kconfig option, clearly marking it as > > deprecated as well as introduce a runtime warning. > > > > Signed-off-by: Nikolay Borisov > > --- > > In the following thread, Dan Middleton raised a point about this interface > being used for local attestation use cases. > > https://lore.kernel.org/all/ZbAaKAh-230Hj4BF@redhat.com/T/#m691dae9a7833a35552cafb597c838df9c2ed5f3a > > Currently, the configfs-based ABI does not support the local attestation use cases. What are local attestation use cases, and what happens if Linux does not provide a local attestation interface and standardizes on remotely attestable as the standard?