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Wed, 14 Jan 2026 03:14:29 +0000 Date: Tue, 13 Jan 2026 19:14:25 -0800 From: Alison Schofield To: Robert Richter CC: Vishal Verma , Ira Weiny , Dan Williams , Jonathan Cameron , Dave Jiang , "Davidlohr Bueso" , , , Gregory Price , "Fabio M. De Francesco" , Terry Bowman , Joshua Hahn Subject: Re: [PATCH v9 03/13] cxl/region: Store HPA range in struct cxl_region Message-ID: References: <20260110114705.681676-1-rrichter@amd.com> <20260110114705.681676-4-rrichter@amd.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260110114705.681676-4-rrichter@amd.com> X-ClientProxiedBy: SJ2PR07CA0024.namprd07.prod.outlook.com (2603:10b6:a03:505::14) To SJ5PPF0D43D62C4.namprd11.prod.outlook.com (2603:10b6:a0f:fc02::80b) Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PPF0D43D62C4:EE_|SJ0PR11MB5769:EE_ X-MS-Office365-Filtering-Correlation-Id: 136d2f41-c8be-4c18-0bf5-08de531b0794 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|366016; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?qQuoTpcMVGL4Zi0g0eevfL0nOO+BtzalYE2glE6nwpJyGf82Yyhmjry/dN/A?= =?us-ascii?Q?r0Q5pCACJLs0MniEPMI5k/G2aFqlp0j8eRflIOZXoCdvC/HGnX7MNKq6kxjs?= =?us-ascii?Q?MKBetYLl78eqQcn3QX7Dac4EB0eW5vcJQFoX1KBnkU6IDF4bIrsyLEagT4/s?= =?us-ascii?Q?U+shoNzMcO4YK68EpCQyubQWk+JlaDGTFtTxqvPNKUSOY0u3ynnPLICBRda9?= =?us-ascii?Q?XiNarFvRCiozE+5hxyitYKTIS5tSLiqh+vx3UuVVa/diJs3U6UAxTeIk3UxU?= =?us-ascii?Q?p0AYvQMi/7TKxpxLMP6rlUAgMAFx8KvM3v7nZJ4cswNqSIH6lFsWAJ5H4+DG?= =?us-ascii?Q?jtgixAEYQh/2BCMo047j4zaNJkzNfWASDxYefJRc5Yl9rjKoLpXNHd4XKL4s?= =?us-ascii?Q?LDQ3og5AO7845rUmMtvBbscAitVD2PzHnFdPslBvAcxa2tNAwb12/JEk7vQJ?= =?us-ascii?Q?a5ag8I6ub2+mEwtYUjXYRMBkWmuZOq4hXDnTEanOTSYCOrdlmvd/X3rNCcZs?= =?us-ascii?Q?VChFKECCnPT6y+Bup68B48h5d2Q2xP+Knj3A5nmkqiW33fqkcKReMytZGwgh?= =?us-ascii?Q?dpPgXLg7k4ZAeq06lx2AIoN2pOHkSxPetKLWMYj5+6lBU9npaDSVioE90G21?= =?us-ascii?Q?ygk/Qjzr6BDBlydrb91BekB94jmfXyFtvmoLeVhXp+PEnVfOWLR04E9p98qm?= =?us-ascii?Q?d/8bHIkkqmxHqELO4XV3eGas8SEEoZnoBytOQJxRqVerZZR5/95wyDahJgJR?= =?us-ascii?Q?SaxdYEKqvn1MiyD828s+kKmcPYayS3+t+jVGDZ7BaAFmx+WE2cHmLkniuYCz?= =?us-ascii?Q?0YczBv3Rc7/xl2e/vnuMEVS3Q9Gq758J1qeXl1HhnjhGxdOdkTuKH9s2/Ehd?= =?us-ascii?Q?hYYRvKSK+C/6yeUfHEaN7o12Kzb8gB2BEqAkziQ6FdxByQPr+tXGmWVTAi4p?= =?us-ascii?Q?Yf1sct6FeJK82BMkBizouipjz02Z9z4EYNeyFttS87sWMfXYIsBzVpXROUj5?= =?us-ascii?Q?m9jTT883it2nUQExKqpE7oe17HLm02C/7Jz8RhPn6O7QenAKHA4KdoVUVaGb?= =?us-ascii?Q?fYzgFHELiDnIROcJgBD0Y7O7o+8LhqcSyfI1RI/cQ2KqOWI01rOSh0nZpwKE?= =?us-ascii?Q?93TSeE7sIbcehzcbFeeU8hR1b1BtbzLGTzCGw7awVydbNE+9j3GHaRdNg9vl?= =?us-ascii?Q?kJc9b5nrkfUTixBFePrgQx9/hl5KGnzeajGFWtyIhvWsiNgRH9zC2G9FS421?= =?us-ascii?Q?C/xDs5a9te7uOWkRRKePTj3oB/B0lRU4/QENEHqk1Srhtv8dTBGAh0dqILJd?= =?us-ascii?Q?72Z6Qh/Uh5md1lCcwjilhzVg9GiBX65CGQXy+SkxuxBjda3ze3vdZ7LYXdS1?= =?us-ascii?Q?L98cc9xk9AwRUbfsDczEcF5+49QoWSdlVaZEVHkV3lQy2rnDKtfjpiVxSOIG?= =?us-ascii?Q?FylhMj4aRhR0E3Hr/neYrjA26ouqlL6K?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SJ5PPF0D43D62C4.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(376014)(366016);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?AcdqsRanpaapdL5yDJ/D1GVtcF3+Yn5sCODgatzQoXyWXBxI0ZJpNMj9Yb5U?= =?us-ascii?Q?CtOr+jLNb6I5mqf9AQXdrzud7qupX0bieOWgcZVfmid93p6D63tydcqze8aK?= =?us-ascii?Q?YnNz2tA0Es1ZSvjKvC+nqlO75hIzhxjAJHnuDx+Uy9INlX0PD+cxFVCdN7Ks?= =?us-ascii?Q?demYAADFPI/RjVtPQZioMULJ8C5AY1C1kUgpbjcRRAyVIeR1wa10+ziWfRPI?= =?us-ascii?Q?KcCV+HYO4FjvoyC0HVEbPgzBKV99WRmL7K6UK8b0AbIU66Q38LS3IHEl240A?= =?us-ascii?Q?YOQ/hkm/uMAAmqP9jVLohzg9PPBLBUc5rQdkkp7ILVx5o48pYEfbRmVr1w2a?= =?us-ascii?Q?1mu+oudOFr913quwKqU/NLNiLEdwHLVjgVq8qiNU1fgyIOa8zqvJaCZnWCtu?= =?us-ascii?Q?XLl2WO6sZJh/nZv6mgYsH1IQPutp+bAHejlEhlEA03CfTa1sAXQFA7cZtvnN?= =?us-ascii?Q?uXvhlUpmih6do0pqX72P9zOIBZCpgYd1e41XD5U1YArk2hQ3CVOh/uPGv6P7?= =?us-ascii?Q?vEmtl+2kmm/ymX4Ddq1pPoYAwPrIf+QFQvO15dOX10BAz8BpNGpsXoqgrSPX?= =?us-ascii?Q?36i2IS1UwIeEbQxAqga0ELzB9Y3Rv1qKc4dw07UucZ/pskh6a9YmN1pKLQRm?= =?us-ascii?Q?AOdrq8X4Vicxjgbfcr9dPmYiW6bh7IwBQxH+CnApU6MjRBBkOuQFUKKLhMkS?= =?us-ascii?Q?oxNZZh7gqyi/xGc9Qz1llXSGpjt0vWV/+nU6phTdL4sEyPEbeNoMtiF+PmXZ?= =?us-ascii?Q?EUKXmx121C6BSijFo8dNfuKF0qpWAGcJ5gt1As8F88B14GXldrY8h7H/THvm?= =?us-ascii?Q?IRr0nCZ0Xm7NZQUEk0rg+bl73aTHkfujpA1xetRWdvv9Ag6oFOlP0SRf9I0J?= =?us-ascii?Q?oSkLrE2YWyvMU77SwGV0bqqS3qN0zyIRc7S7LMM/u50qq+0426NmLH/pRkMs?= =?us-ascii?Q?LQ3waulDE/hZZaJI1qU1LU+jPKx4RQGXUhdgzLW0mUARSRf8ianvnbUcQz9h?= =?us-ascii?Q?CAIJoP0/iaykL1iFumij3PbQTAu+p+WaHTlV2UQYYOwVulwWjFMgUiVVuXbo?= =?us-ascii?Q?0X5SGgfcD3KWLM8cmSBNDmoNAuij1Z4XJoQH0QQ86sF1+NS+JAKxjsc5RmHU?= =?us-ascii?Q?ob3+Wkeo2aA8qp12MFsn+JL/iutWrBKboc71WHG1Hf01WCjWEHT33e/IP/vB?= =?us-ascii?Q?DBCJBKad56/C3Ct/ucULYwY7Af+dUVI8Qm8lZv7guDGYMaY+inqeR3srhs0d?= =?us-ascii?Q?iLSNh+U0QLMlpyJ+kfxO1Az/nqpzbH7OEmFjlOQTgc7+B9QvA/sp4+wZJSMM?= =?us-ascii?Q?1T5Qm93NDeAZLjSjSCkFyP9gI+J32IIlakTYCnfWPFCFb3MQSgJpb0y4PToc?= =?us-ascii?Q?/yB4Tp5f88YPKZR6mjiqqZbvTo2XOpYM9a56X2+W/8RqttXX4Xuw9Pn0nVgq?= =?us-ascii?Q?x3HlXxbUKNvXASb+nOlxZ7iTUlgKq7qcIhTBxw4yZk9u/0IynDBXgI+ukFlZ?= =?us-ascii?Q?rI9aezYgV6If9Noey5AsO9rFwlH4nONva3fDTCXc2/WW9//ZdmSHaaosTvJh?= =?us-ascii?Q?hoDBBNq8MAZSwryZN3z9UKWODg7u57ermAPhdT6Zezr+iTnYnTis093uOXGY?= =?us-ascii?Q?s61MQZX2EknGp4FhlX7JyAtJ/d3hqdrJHtrPPucVMKmU/fbMgoqFS9ErmxzG?= =?us-ascii?Q?xWfqz1jbJHo5I2qHU+GTyOJuMNrJPL1iFjVm1Vz4dX1saK1FnrsZxftVCRO+?= =?us-ascii?Q?fUmwqZlxVwpHy9DM+Hnf3+Q7G2qcKOw=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: 136d2f41-c8be-4c18-0bf5-08de531b0794 X-MS-Exchange-CrossTenant-AuthSource: SJ5PPF0D43D62C4.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jan 2026 03:14:29.0655 (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: J8VXz5uxuvj3TO6xHX3wLQ8H2i7XcocRKgUkFt8CGiHg6cnO+Kq6qrAk+rH3iI99dNMUEreIBq5T+L0dmOWnej5tHf32u8efbSYdaYQzh9A= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR11MB5769 X-OriginatorOrg: intel.com On Sat, Jan 10, 2026 at 12:46:48PM +0100, Robert Richter wrote: > Each region has a known host physical address (HPA) range it is > assigned to. Endpoint decoders assigned to a region share the same HPA > range. The region's address range is the system's physical address > (SPA) range. > > Endpoint decoders in systems that need address translation use HPAs > which are not SPAs. To make the SPA range accessible to the endpoint > decoders, store and track the region's SPA range in struct cxl_region. > Introduce the @hpa_range member to the struct. Now, the SPA range of > an endpoint decoder can be determined based on its assigned region. > > Patch is a prerequisite to implement address translation which uses > struct cxl_region to store all relevant region and interleaving > parameters. Reviewed-by: Alison Schofield