From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 892BD1A5B9D; Tue, 15 Jul 2025 13:19:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752585556; cv=none; b=dwYjOkEQU6TwojS2JaT/b1fQXARFnPQcnVjKdRAmDp6g0+UziBDjsmF398I0O5YC56I3u8ISNGweLjA3yL9/Eb5tVislt9RkR8vOspe/1cD4e62nIuKxxZ3BsFoRPC9vMtdWPf3MvvRG2wlSSLexOsQji1XXmrOq+Qj79AGhkgE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752585556; c=relaxed/simple; bh=loVkRoNoWOnlNzh7PuGxrJGlQRmyH/Fe7WGjG2DLotw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=N/l8a2IAoFerA/21MG3Og+DVSzQyKxxEsIQ6GEVAtjeQHN59UvXGSovy6h4y7qzD/Gj53C29tdLjzkzMMgiBzYJVqLkCLHryGSrTSZr780YwYHcI06CK5pU+ITj65V9fxvIa7YzgjE9Eevn1ESvt2sUmb+EX5DuK/53LeLyiKRI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=doLjw0z+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="doLjw0z+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9EC9C4CEE3; Tue, 15 Jul 2025 13:19:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1752585556; bh=loVkRoNoWOnlNzh7PuGxrJGlQRmyH/Fe7WGjG2DLotw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=doLjw0z+uDBW//nAyySrfC+NsuBs0oCKonD8sSAoQYReDMKeRSBxxuEOuZfhD9O+p s/PWrslNe69iFLw8RjZd7M/AB9wFFEoNCsX+jmqKglRsKgq+1MEPUbQ488eIzJ9PHr ANylwDn3gRD3G8QNwBVzC5LDTeVVuGHwViCwvzbI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Aijay Adams , JP Kobryn , "Borislav Petkov (AMD)" , Tony Luck , Qiuxu Zhuo , stable@kernel.org Subject: [PATCH 6.12 053/163] x86/mce: Make sure CMCI banks are cleared during shutdown on Intel Date: Tue, 15 Jul 2025 15:12:01 +0200 Message-ID: <20250715130810.882911857@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250715130808.777350091@linuxfoundation.org> References: <20250715130808.777350091@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: JP Kobryn commit 30ad231a5029bfa16e46ce868497b1a5cdd3c24d upstream. CMCI banks are not cleared during shutdown on Intel CPUs. As a side effect, when a kexec is performed, CPUs 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. [ bp: Massage commit message. ] Reported-by: Aijay Adams Signed-off-by: JP Kobryn Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Tony Luck Reviewed-by: Qiuxu Zhuo Cc: Link: https://lore.kernel.org/20250627174935.95194-1-inwardvessel@gmail.com Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/cpu/mce/intel.c | 1 + 1 file changed, 1 insertion(+) --- a/arch/x86/kernel/cpu/mce/intel.c +++ b/arch/x86/kernel/cpu/mce/intel.c @@ -477,6 +477,7 @@ void mce_intel_feature_init(struct cpuin void mce_intel_feature_clear(struct cpuinfo_x86 *c) { intel_clear_lmce(); + cmci_clear(); } bool intel_filter_mce(struct mce *m)