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Tue, 21 Oct 2025 13:37:52 +0000 Message-ID: Date: Tue, 21 Oct 2025 16:37:48 +0300 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 1/4] KVM: TDX: Synchronize user-return MSRs immediately after VP.ENTER To: "Edgecombe, Rick P" , "pbonzini@redhat.com" , "kas@kernel.org" , "seanjc@google.com" CC: "Li, Xiaoyao" , "kvm@vger.kernel.org" , "linux-coco@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "Zhao, Yan Y" , "x86@kernel.org" , "hou, wenlong" References: <20251016222816.141523-1-seanjc@google.com> <20251016222816.141523-2-seanjc@google.com> Content-Language: en-US From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo, Business Identity Code: 0357606 - 4, Domiciled in Helsinki In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: DU6P191CA0056.EURP191.PROD.OUTLOOK.COM (2603:10a6:10:53e::17) To IA1PR11MB7198.namprd11.prod.outlook.com (2603:10b6:208:419::15) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA1PR11MB7198:EE_|DM6PR11MB4580:EE_ X-MS-Office365-Filtering-Correlation-Id: da27227c-d70e-4fb3-8a12-08de10a708a4 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|366016|1800799024; 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Mark those MSRs as needing an >> + * update to synchronize the "current" value in KVM's cache with the >> + * value in hardware (loaded by the TDX-Module). >> + */ > > I think we should be synchronizing only after a successful VP.ENTER with a real > TD exit, but today instead we synchronize after any attempt to VP.ENTER. If the MSR's do not get clobbered, does it matter whether or not they get restored.