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Wed, 10 Dec 2025 00:53:07 +0000 Date: Wed, 10 Dec 2025 08:50:44 +0800 From: Yan Zhao To: Sagi Shahar CC: "Edgecombe, Rick P" , "kvm@vger.kernel.org" , "quic_eberman@quicinc.com" , "Li, Xiaoyao" , "Du, Fan" , "Hansen, Dave" , "david@redhat.com" , "thomas.lendacky@amd.com" , "tabba@google.com" , "vbabka@suse.cz" , "michael.roth@amd.com" , "seanjc@google.com" , "Weiny, Ira" , "kas@kernel.org" , "pbonzini@redhat.com" , "ackerleytng@google.com" , "linux-kernel@vger.kernel.org" , "binbin.wu@linux.intel.com" , "Yamahata, Isaku" , "Peng, Chao P" , "zhiquan1.li@intel.com" , "Annapurve, Vishal" , "Miao, Jun" , "x86@kernel.org" , "pgonda@google.com" Subject: Re: [RFC PATCH v2 10/23] KVM: TDX: Enable huge page splitting under write kvm->mmu_lock Message-ID: Reply-To: Yan Zhao References: <20250807093950.4395-1-yan.y.zhao@intel.com> <20250807094333.4579-1-yan.y.zhao@intel.com> <5b9c454946a5fb6782c1245001439620f04932b3.camel@intel.com> Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-ClientProxiedBy: SI2P153CA0014.APCP153.PROD.OUTLOOK.COM (2603:1096:4:140::6) 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_|SJ0PR11MB5134:EE_ X-MS-Office365-Filtering-Correlation-Id: d653e047-7f88-4da1-0bbb-08de37867bee 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|376014|7416014|366016|1800799024; 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Looking at the TDX module code > > > (version 1.5.16 from [1]) I see that demote and promote are the only > > > seamcalls that return TDX_INTERRUPTED_RESTARTABLE so it wasn't handled > > > by KVM until now. > > > > Did you see "Open 3" in the coverletter? > > I tested the code using TDX module 1.5.24 which is the latest one we > got. Is there a newer TDX module that supports this new functionality? AFAIK, TDX module 1.5.28 is the earliest version that enumerates TDX_FEATURES0.ENHANCED_DEMOTE_INTERRUPTIBILITY (bit 51) and disables TDX_INTERRUPTED_RESTARTABLE when there're no L2 TDs. (Please check the discussions at [1]). Looks 1.5.28.04 was just released (internally?), with release note saying "Ensure TDH.MEM.PAGE.DEMOTE forward progress for non partitioned TDs". Not sure if you can check it. [1] https://lore.kernel.org/all/aRRAFhw11Dwcw7RG@yzhao56-desk.sh.intel.com/