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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BL02EPF0001A103.mail.protection.outlook.com (10.167.241.133) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8534.20 via Frontend Transport; Tue, 11 Mar 2025 20:06:41 +0000 Received: from [10.236.184.9] (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Tue, 11 Mar 2025 15:06:39 -0500 Message-ID: <1cf1354c-a0ec-4096-a693-22168acbf51f@amd.com> Date: Tue, 11 Mar 2025 15:06:39 -0500 Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Ben Cheatham Subject: Re: [PATCH v11 19/23] cxl: add region flag for precluding a device memory to be used for dax To: CC: Zhi Wang , Jonathan Cameron , , , , , , , , , , References: <20250310210340.3234884-1-alejandro.lucero-palau@amd.com> <20250310210340.3234884-20-alejandro.lucero-palau@amd.com> Content-Language: en-US In-Reply-To: <20250310210340.3234884-20-alejandro.lucero-palau@amd.com> Content-Type: text/plain; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Mar 2025 20:06:41.0406 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: eef98e49-1e0b-4333-3a81-08dd60d83d1b X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL02EPF0001A103.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6397 On 3/10/25 4:03 PM, alejandro.lucero-palau@amd.com wrote: > From: Alejandro Lucero > > By definition a type2 cxl device will use the host managed memory for > specific functionality, therefore it should not be available to other > uses. However, a dax interface could be just good enough in some cases. > > Add a flag to a cxl region for specifically state to not create a dax > device. Allow a Type2 driver to set that flag at region creation time. > > Signed-off-by: Alejandro Lucero > Reviewed-by: Zhi Wang > Reviewed-by: Jonathan Cameron > --- Reviewed-by: Ben Cheatham