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Mon, 7 Jul 2025 20:32:28 +0000 Message-ID: Date: Mon, 7 Jul 2025 13:32:26 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 06/10] x86/nmi: Add support to handle NMIs with source information Content-Language: en-US To: "Zhuo, Qiuxu" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" CC: Xin Li , "H . Peter Anvin" , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Peter Zijlstra , "Sean Christopherson" , "Hunter, Adrian" , Kan Liang , "Luck, Tony" , "Zhang, Rui" , "Steven Rostedt" , "andrew.cooper3@citrix.com" , "Kirill A . Shutemov" , Jacob Pan , Andi Kleen , "Huang, Kai" , "Sandipan Das" , "linux-perf-users@vger.kernel.org" , "linux-edac@vger.kernel.org" , "kvm@vger.kernel.org" , "linux-pm@vger.kernel.org" , "linux-trace-kernel@vger.kernel.org" References: <20250612214849.3950094-1-sohil.mehta@intel.com> <20250612214849.3950094-7-sohil.mehta@intel.com> From: Sohil Mehta In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SJ0PR05CA0015.namprd05.prod.outlook.com (2603:10b6:a03:33b::20) To BYAPR11MB3320.namprd11.prod.outlook.com (2603:10b6:a03:18::25) Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR11MB3320:EE_|CO1PR11MB5058:EE_ X-MS-Office365-Filtering-Correlation-Id: efe8df48-2f98-4985-1f1c-08ddbd9563f6 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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For example, GHES does this. register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes", NMIS_NO_SOURCE); Now, when a GHES NMI shows up, can it have anything other than bit 0 (NMIS_NO_SOURCE) set in the source bitmap? I believe the answer is no. Unless the GHES implementation or the hardware has a bug, this should not happen. If this happens, it would get logged as an unknown NMI in the kernel log. > If so, we may need to allow the NMI handler with the NMIS_NO_SOURCE type to be > invoked unconditionally to ensure no NMIs are lost. > If the kernel can't rely on the accuracy of the source_bitmap, then NMI-source as a feature starts losing value. Sohil