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Thu, 11 Jun 2026 03:26:19 +0000 Message-ID: <36213825-c353-46b4-8a05-83ea446201a4@intel.com> Date: Thu, 11 Jun 2026 11:26:04 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] mpam,x86,fs/resctrl: Generic schema description Proof of Concept To: Reinette Chatre CC: Borislav Petkov , Thomas Gleixner , "Dave Hansen" , Peter Newman , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Ben Horgan , Tony Luck , Dave Martin , James Morse , Drew Fustini , Babu Moger , Fenghua Yu References: <29c95b69-e1a4-46b1-ab8b-45c09308b924@arm.com> <7f2d0cc3-266c-4fa3-a9ba-7352325c76d1@intel.com> <3ef279c9-c4b3-48cb-8235-da8a871b54f9@arm.com> <5cffdb88-924e-43e7-84f2-ea19d82910fb@intel.com> <0c957e0a-0188-40c0-96e6-4e5d787a8ae6@arm.com> <8bd94a5f-1460-4bc3-a2b2-68a298200ad8@intel.com> Content-Language: en-US From: "Chen, Yu C" In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SG2PR01CA0192.apcprd01.prod.exchangelabs.com (2603:1096:4:189::21) To DM4PR11MB6020.namprd11.prod.outlook.com (2603:10b6:8:61::19) 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: DM4PR11MB6020:EE_|DM3PPF818092190:EE_ X-MS-Office365-Filtering-Correlation-Id: f28c2064-3ccb-4c8e-7e92-08dec7693418 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|23010399003|366016|7416014|376014|56012099006|22082099003|18002099003|11063799006|5023799004|4143699003; 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Is this > accurate? What will behavior be on an ERDT system that does not support > MSR access with the percentage-based control? Would it make sense to encourage users to switch to MMIO-based access if the platform replaces MSR interfaces with MMIO-based ones? One issue with emulating MSR-based access is that there may not be a strict 1:1 mapping between the MSR range and the MMIO range. Additionally, I am unsure whether both are strictly linearly scalable, so it could be challenging to create a proper mapping for msr_value_emulated = map(mmio_value) IIUC. thanks, Chenyu