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Wed, 6 May 2026 02:56:22 +0000 Date: Wed, 6 May 2026 10:56:10 +0800 From: Chao Gao To: Dave Hansen CC: , , , , , , , , , , , , , , , , , , , , , , , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" Subject: Re: [PATCH v8 10/21] x86/virt/seamldr: Shut down the current TDX module Message-ID: References: <20260427152854.101171-1-chao.gao@intel.com> <20260427152854.101171-11-chao.gao@intel.com> <0523b07b-2df2-4cf4-bf98-6efe01780698@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <0523b07b-2df2-4cf4-bf98-6efe01780698@intel.com> X-ClientProxiedBy: TP0P295CA0007.TWNP295.PROD.OUTLOOK.COM (2603:1096:910:2::7) To CH3PR11MB8660.namprd11.prod.outlook.com (2603:10b6:610:1ce::13) 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: CH3PR11MB8660:EE_|PH7PR11MB7552:EE_ X-MS-Office365-Filtering-Correlation-Id: b419942a-7a97-4622-1784-08deab1b0e1b 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|366016|1800799024|376014|56012099003|22082099003|18002099003; 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>> + int cpu = smp_processor_id(); >> + bool primary; >> int ret = 0; >> >> + primary = cpumask_first(cpu_online_mask) == cpu; > >Isn't cpumask_first(cpu_online_mask)==0, always? I thought CPU 0 could >never be offlined. Not always. On x86, CPU 0 can be offlined at runtime if the kernel is booted with the cpu0_hotplug command-line option. See cpu_hotplug.rst.