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Fri, 24 Oct 2025 23:39:53 +0000 Message-ID: <20bcb73c-9bb1-4030-8ae7-1a2d0952ac01@intel.com> Date: Fri, 24 Oct 2025 16:39:50 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 04/10] x86,fs/resctrl: Implement "io_alloc" enable/disable handlers To: Babu Moger , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , References: <8356c090156a90b080dfa2332a70f8aa71f34621.1761090860.git.babu.moger@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <8356c090156a90b080dfa2332a70f8aa71f34621.1761090860.git.babu.moger@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0314.namprd03.prod.outlook.com (2603:10b6:303:dd::19) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) 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: SJ2PR11MB7573:EE_|LV3PR11MB8554:EE_ X-MS-Office365-Filtering-Correlation-Id: 6e30f3e4-15ca-4bc8-2b3e-08de1356a1bd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014|7053199007; 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On AMD systems, "io_alloc" resctrl feature is backed by AMD's > L3 Smart Data Cache Injection Allocation Enforcement (SDCIAE). > > Introduce the architecture-specific functions that resctrl fs should call > to enable, disable, or check status of the "io_alloc" feature. Change > SDCIAE state by setting (to enable) or clearing (to disable) bit 1 of > MSR_IA32_L3_QOS_EXT_CFG on all logical processors within the cache domain. > > The SDCIAE feature details are documented in APM [1] available from [2]. > [1] AMD64 Architecture Programmer's Manual Volume 2: System Programming > Publication # 24593 Revision 3.41 section 19.4.7 L3 Smart Data Cache > Injection Allocation Enforcement (SDCIAE). > > Signed-off-by: Babu Moger > Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 # [2] > --- Reviewed-by: Reinette Chatre Reinette