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Fri, 25 Apr 2025 07:19:52 +0000 Date: Fri, 25 Apr 2025 15:17:55 +0800 From: Yan Zhao To: Binbin Wu CC: , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [RFC PATCH 03/21] x86/virt/tdx: Add SEAMCALL wrapper tdh_mem_page_demote() Message-ID: Reply-To: Yan Zhao References: <20250424030033.32635-1-yan.y.zhao@intel.com> <20250424030445.32704-1-yan.y.zhao@intel.com> <8e15c41e-730f-493e-9628-99046af50c1e@linux.intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <8e15c41e-730f-493e-9628-99046af50c1e@linux.intel.com> X-ClientProxiedBy: SI2PR01CA0047.apcprd01.prod.exchangelabs.com (2603:1096:4:193::10) To DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) 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: DS7PR11MB5966:EE_|CH3PR11MB7202:EE_ X-MS-Office365-Filtering-Correlation-Id: a0bbe5df-5d66-4b98-5a07-08dd83c9924d X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|376014|366016; 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Currently, the > > TDX module only supports demotion of a 2M huge leaf entry. After a > > successful demotion, the old 2M huge leaf entry in S-EPT is replaced with a > > non-leaf entry, linking to the newly-added page table page. The newly > > linked page table page then contains 512 leaf entries, pointing to the 2M > > 2M or 4K? The 512 leaf entries point to 2M guest private pages together, each pointing to 4K. > > guest private pages.