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Tue, 3 Feb 2026 21:08:43 +0000 Message-ID: <0149c37d-7065-4c72-ab56-4cea1a6c15d0@intel.com> Date: Tue, 3 Feb 2026 13:08:39 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] x86/x2apic: disable x2apic on resume if the kernel expects so Content-Language: en-US To: Shashank Balaji , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , , "H. 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Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Ajay Kaher , Alexey Makhalov , Broadcom internal kernel review list , Jan Kiszka , Paolo Bonzini , Vitaly Kuznetsov , Juergen Gross , Boris Ostrovsky CC: Ingo Molnar , , , , , , , Rahul Bukte , "Daniel Palmer" , Tim Bird , References: <20260202-x2apic-fix-v1-0-71c8f488a88b@sony.com> <20260202-x2apic-fix-v1-1-71c8f488a88b@sony.com> From: Sohil Mehta In-Reply-To: <20260202-x2apic-fix-v1-1-71c8f488a88b@sony.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR13CA0074.namprd13.prod.outlook.com (2603:10b6:a03:2c4::19) To DS0PR11MB7997.namprd11.prod.outlook.com (2603:10b6:8:125::14) Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7997:EE_|SA3PR11MB8024:EE_ X-MS-Office365-Filtering-Correlation-Id: e3a565a4-48c6-461e-47dd-08de636869a7 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|921020; 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> } else { > + /* > + * x2apic may have been re-enabled by the > + * firmware on resuming from s2ram > + */ > + __x2apic_disable(); > + We should likely only disable x2apic on platforms that support it and need the disabling. How about? ... } else { /* * */ if (x2apic_enabled()) __x2apic_disable(); I considered if an error message should be printed along with this. But, I am not sure if it can really be called a firmware issue. It's probably just that newer CPUs might have started defaulting to x2apic on. Can you specify what platform you are encountering this?