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Fri, 31 Jul 2026 00:18:38 +0000 Date: Thu, 30 Jul 2026 17:18:34 -0700 From: Alison Schofield To: Richard Cheng CC: , , , , , , , , , , , , , , Vishal Aslot Subject: Re: [PATCH v7 2/2 RESEND] tools/testing/cxl: Enable zero sized decoders under hb0 Message-ID: References: <20260721085715.39322-1-icheng@nvidia.com> <20260721085715.39322-3-icheng@nvidia.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260721085715.39322-3-icheng@nvidia.com> X-ClientProxiedBy: SJ0PR03CA0038.namprd03.prod.outlook.com (2603:10b6:a03:33e::13) To DS4PPF0BAC23327.namprd11.prod.outlook.com (2603:10b6:f:fc02::9) 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: DS4PPF0BAC23327:EE_|DS7PR11MB7951:EE_ X-MS-Office365-Filtering-Correlation-Id: 33926f0b-362c-4c21-49eb-08deee99448f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|23010399003|366016|4143699003|6133799003|11063799006|56012099006|22082099003|18002099003|10067099003; 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cxl_test needs to exercise that path. > > Add a mock_zero_size_decoders module parameter (default off). When set, > the special endpoints under host-bridge0 (cxl_mem.0 and cxl_mem.4) > commit decoders 1 and 2 as zero-size + locked above the decoder[0] > auto-region, mirrored on the parent switch and host bridge. The mocks > take a real zero-size DPA reservation, like enumeration of real > hardware, so commit_end lands on a zero-size decoder and the > reservation, poison-by-endpoint, and teardown paths all run. > > Signed-off-by: Vishal Aslot > Signed-off-by: Richard Cheng Reviewed-by: Alison Schofield