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[67.180.10.175]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23acb3ad16fsm22267355ad.141.2025.06.27.10.49.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Jun 2025 10:49:42 -0700 (PDT) From: JP Kobryn To: tony.luck@intel.com, bp@alien8.de, tglx@linutronix.de, mingo@redhat.com, dave.hansen@linux.intel.com, hpa@zytor.com, aijay@meta.com Cc: linux-edac@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: [PATCH tip: x86/bugs v2] x86/mce: make sure cmci banks are cleared during shutdown on intel Date: Fri, 27 Jun 2025 10:49:35 -0700 Message-ID: <20250627174935.95194-1-inwardvessel@gmail.com> X-Mailer: git-send-email 2.50.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit CMCI banks are not cleared during shutdown on intel CPU's. As a side effect when a kexec is performed, CPU's coming back online are unable to rediscover/claim these occupied banks which breaks MCE reporting. Clear the CPU ownership during shutdown via cmci_clear() so the banks can be reclaimed and MCE reporting will become functional once more. Signed-off-by: JP Kobryn Reported-by: Aijay Adams Reviewed-by: Tony Luck Reviewed-by: Qiuxu Zhuo --- arch/x86/kernel/cpu/mce/intel.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c index efcf21e9552e..9b149b9c4109 100644 --- a/arch/x86/kernel/cpu/mce/intel.c +++ b/arch/x86/kernel/cpu/mce/intel.c @@ -478,6 +478,7 @@ void mce_intel_feature_init(struct cpuinfo_x86 *c) void mce_intel_feature_clear(struct cpuinfo_x86 *c) { intel_clear_lmce(); + cmci_clear(); } bool intel_filter_mce(struct mce *m) -- 2.47.1