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Fri, 14 Feb 2025 16:19:54 +0000 Message-ID: Date: Fri, 14 Feb 2025 10:19:49 -0600 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/4] tsm: Unified Measurement Register ABI for TVMs To: Dave Hansen , Dan Williams , "Kirill A. Shutemov" , Dave Hansen , Thomas Gleixner , Ingo Molnar , Borislav Petkov , , "H. Peter Anvin" CC: , , "Kuppuswamy Sathyanarayanan" References: <20250212-tdx-rtmr-v1-0-9795dc49e132@intel.com> <15c69d57-4ffb-4ea1-8cbc-0ba6d3d7b14f@intel.com> <015cdddb-7f74-4205-af8a-b15cad7ddc22@intel.com> Content-Language: en-US From: "Xing, Cedric" In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR13CA0134.namprd13.prod.outlook.com (2603:10b6:a03:2c6::19) To DS7PR11MB6269.namprd11.prod.outlook.com (2603:10b6:8:97::14) 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: DS7PR11MB6269:EE_|DM4PR11MB8179:EE_ X-MS-Office365-Filtering-Correlation-Id: b2746d10-f7d5-4969-b267-08dd4d136a21 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|366016; X-Microsoft-Antispam-Message-Info: =?utf-8?B?MHNrc05sa3hxTno4UHZrNnlkUVZZd3VuWjRIb1Q2WnBBN2tSbGU4cnF2Umxs?= =?utf-8?B?bmx1MStWRTlMc25CZjZ5MHJZNjQvL3pORVBPQ3RJSTRMZWt0WWhTNjhYWWwz?= =?utf-8?B?NDhaa1p1L2RydENrVW40dmIvQXlnK1ZsMit0cjZXemZkUGFDYmx5ME05VllN?= =?utf-8?B?U0xzMUJ5VjZpS3ZNMHJmTys2czlTV0p3dkhGMTFqMTdtTDZSSWVnS0JIQy9T?= =?utf-8?B?dEhYN0RlSVN4QmduS2VzaDk2d2plRko0dTBkdngwMWN3RDhOR3k5cDd3Rncw?= =?utf-8?B?OTFNbjZwbXNNR2RENVZLdFBvMEI0eHhvekkvWS9oLzgrNnNHdDF0OWZ2blRW?= =?utf-8?B?eU9jTmZyY2xzNTdVdTlXblQydzgwL0hxSzRrdFRCczlOVlQ4ZldaRzFVM09u?= =?utf-8?B?VzNvQnUwcnRteEU1SGJXT1JnZ3Z6WmVLRVdvSW5hZ0VmUVM3blowNGg2RjM2?= =?utf-8?B?WjF5Vk9iWVl5TW1IWmwxTHY4NmpRMEVhaXZoam5BYWR1TGgwZWVvbmFFaHBl?= =?utf-8?B?V1YrNUNJOFNDK1dQL0t3TEFkclFhUUhSYkJaU0tBcFEweGNPdmxZYjNVdEZ5?= =?utf-8?B?Z2NJTGlTTVlTWGdRbXZWZnAyY3F4RkM0M3QrY3NEMjFGQTJqMXA0a1ErWUNJ?= =?utf-8?B?ODJVVDN0aWFtMlFkcXBMd2N2azVVZ3Bqb3NtNHhXbTh2c2dTZldpMEFGWmxH?= =?utf-8?B?dDg1amcreGtWMVRRL0pDcmowQTVJOHg0c0xVaWFnd3pxOXhEdkJpNFpjWXBD?= =?utf-8?B?Qkx2Ti9qVFhESlZnMmlZWUZKN3RxUmNkWFhMODdMSkhRUjg3M1YxOUlOMEJ2?= =?utf-8?B?ZGtaUUN0eERoanZlRlFDTGpicDZEMzloaWp5QnZLTzI0eEpQWG9iZTFtcmNZ?= =?utf-8?B?THJqTmtIOHBHemJySWpiTVJoMTBIRlpVOUFQLzU2bHh6SkcxTHU5RjVndFpU?= =?utf-8?B?L0VDSkM4SzFnbnJVMWVORGtKNVJRay9iVE5oSTNFekRBQXhxcG11TXRVeW5y?= =?utf-8?B?OVRVc0FjNUx1Nm51WTMzMS9XN1FkZ2p4TDI3MkRYOTJJZWh1d2x0TE1BQTU5?= =?utf-8?B?Y3JYTWx2Zlh4UDBzS2M1WWdpMmVUMThzRVNxaHArRW9OZVR4Vkl6a1FTY2xp?= =?utf-8?B?UWhTM2ZWWDBqcldsLy9WMkFxMCt5czZPOUtRTWhFZHJCRXB0MlM3VWtrSXF4?= =?utf-8?B?S3ZibUJOaE9UbXEvT3FraEMzWS9EVTF1S0kyU1VmejRFSkcreFJycDFKYzMx?= =?utf-8?B?R1FxTys1S2VTSUd1UW0xNjgvL1M5MS9wdXVkVU4rRUhtQm1wSFM2ZjRJOXlM?= =?utf-8?B?MTFXTXFoWDJaR0tHNEw4bXhjMW5jSWRjU3VKM3B2QVprL0Z2dm1UVUZRZWxC?= =?utf-8?B?ZDI0T3hFWm9oaHEwVERzekVmUU1ORk5uSlhoWjFQdFp1Q0xwNTAwRDRia2Fk?= =?utf-8?B?RDFwakJ3VllKTEl3ZllnQ29iRHF2YmtuaTBaTi9uMjNJampvN1NuYWJ1NVN6?= =?utf-8?B?Mkw5ZDBjSDVLRHFVa3RTQkQ0Ym1WU0Zud0hQYWQ4Wng3THg4WWlFUUZ6cEN0?= =?utf-8?B?enhYYTg4SUdoN2F3cndFQ25ONnQyVVZiSWRnMFV2OVlzbUxkaEtHZG9TOGhj?= =?utf-8?B?REwyQnFGaFdaL0xJdXhFTHBodUtHeUpXTDZ6M0Y0aDJLRnBFOU1GdGoxNlNH?= =?utf-8?B?UVBuZGQ1bnhMMWVxQ1kyd2w1NHlnb1JtdGVaSlRhL3hlWmhVSnhLOW1Jek1t?= =?utf-8?B?NFgxRXJ2eGNhRVFEZncyYk5mUUpESnVlK2RTcm9QQW81d0RtM0tnZEdkMFRG?= =?utf-8?B?Y29JbjNFb2N1Y2NZUEVMbzdJYzVyRHVtZ2xKUnE4ak9sMWdBQnM2bThIWUx2?= =?utf-8?Q?0x4q584qtrKMR?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS7PR11MB6269.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(7416014)(376014)(1800799024)(366016);DIR:OUT;SFP:1101; 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This just >>> adds a parallel sysfs interface to the existing ABI? >>> >> No, this is new. There's no existing ABI for accessing measurement >> registers from within a TVM (TEE VM). Currently, on TDX for example, >> reading TDX measurement registers (MRs) must be done by getting a TD >> quote. And there's no way to extend any RTMRs. Therefore, it would be >> much easier end users to debug/diagnose measurement related issues >> (which would almost always require reading MRs) with this patch. > > Ok, that makes sense. > > But if this is for debug, wouldn't these belong better in debugfs? Do we > really want to maintain this interface forever? There's no shame in debugfs. > There are many other (more important/significant) uses besides debugging. For example, any applications that make use of runtime measurements must extend RTMRs, and this interface provides that exact functionality. Another example, a policy may be associated with a TD (e.g., CoCo) by storing its digest in MRCONFIGID, so that the policy could be verified against its digest at runtime. This interface allows applications to read MRCONFIGID.