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Tue, 20 Aug 2024 08:18:04 +0000 Message-ID: <35cd0f5d-fe21-41ef-926c-c53baee26b6d@intel.com> Date: Tue, 20 Aug 2024 16:22:17 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 16/16] iommupt: Add the Intel VT-D second stage page table format To: Jason Gunthorpe , "Zhang, Tina" CC: Alejandro Jimenez , Lu Baolu , David Hildenbrand , "Christoph Hellwig" , "iommu@lists.linux.dev" , "Joao Martins" , "Tian, Kevin" , "kvm@vger.kernel.org" , "linux-mm@kvack.org" , Pasha Tatashin , Peter Xu , Ryan Roberts , Sean Christopherson References: <0-v1-01fa10580981+1d-iommu_pt_jgg@nvidia.com> <16-v1-01fa10580981+1d-iommu_pt_jgg@nvidia.com> <20240819155310.GB3094258@nvidia.com> Content-Language: en-US From: Yi Liu In-Reply-To: <20240819155310.GB3094258@nvidia.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SG2PR02CA0014.apcprd02.prod.outlook.com (2603:1096:3:17::26) To DS0PR11MB7529.namprd11.prod.outlook.com (2603:10b6:8:141::20) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7529:EE_|CY5PR11MB6138:EE_ X-MS-Office365-Filtering-Correlation-Id: 8beaaace-de21-4502-231e-08dcc0f09d5b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014; 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Format for Second-Stage Paging Entries > > Bit 2 = X^1 > > 1. X field is ignored by hardware if Execute Request Support (ERS) is > reported as Clear in the Extended Capability Register or if SSEE=0 in > the scalable-mode PASID-table entry referencing the second-stage > paging entries. it was deprecated. :( Refer to the latest spec (after 4.1). And the ERS bit is going to be deprecated as well. 11.4.3 Extended Capability Register "This field is planned for deprecation. Implementations must report this field as Clear to indicate that the remapping unit does not support requests-with-PASID that have a value of 1 in the Execute-Requested (ER) field." -- Regards, Yi Liu