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Thu, 13 Feb 2025 21:50:25 +0000 Message-ID: Date: Thu, 13 Feb 2025 15:50:19 -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: <015cdddb-7f74-4205-af8a-b15cad7ddc22@intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR05CA0045.namprd05.prod.outlook.com (2603:10b6:a03:33f::20) To DS7PR11MB6269.namprd11.prod.outlook.com (2603:10b6:8:97::14) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR11MB6269:EE_|SJ0PR11MB7704:EE_ X-MS-Office365-Filtering-Correlation-Id: a0c441c7-bd27-442c-1500-08dd4c786c21 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|366016|1800799024|7416014|376014; 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This >> simplifies the process of debugging and diagnosing measurement-related >> issues. Additionally, it makes the CC architecture more intuitive for >> newcomers. > > Wait a sec, so there's already ABI for manipulating these? 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. > Also, you're saying that users don't need to write any code, but then > provide... sample code. That's unexpected. > The sample code is to demo how to expose MRs from a CC guest driver, but not for end users to access those MRs. > Oh, and you seem to have forgotten to attach the sysfs ABI documentation > patch to the series. You did write the required documentation, right? ;) Documentation/ABI/testing/sysfs-kernel-tsm (new file added by patch 1) contains a description on the attributes added by the patch.