From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0AD62C433F5 for ; Fri, 21 Jan 2022 17:48:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1381822AbiAURsB (ORCPT ); Fri, 21 Jan 2022 12:48:01 -0500 Received: from mga11.intel.com ([192.55.52.93]:56027 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1381864AbiAURrw (ORCPT ); Fri, 21 Jan 2022 12:47:52 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1642787272; x=1674323272; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=QxJ1Z8BS1hZL8whFuL6RPwtcoEig2y1OhfDG0d4TBGA=; b=NVePwGBIdXl2dpSNudMBLrA0pqQxu9fWJvOTbwCzPFqTA43aJl+E4gNO wnrCAiB6ovqDGpZIWXJU3i+bbZx+JMLpTIRm5HQA+rbAa5OBZl0ik0iR6 JjAm/xuzFFKT4tAknIiZ39Ksc38vHofwzjJCaxvMKyE1LTwPc6o52leC4 YzlmTwZTSzpgZAP8kJOkEAnGu+YiczatPHh44SXjovw+qa2Lnoz2UO2TJ KLcfAHl1+By0emWYUDftqODofl3a5IDOpSMRsbuyk27cdW1xSX303335B 2JsTTaUKzvUbt6J7XnclrsZ70Nfx3S0yUujKCdveCKtYbEGve5ZtXgCzc Q==; X-IronPort-AV: E=McAfee;i="6200,9189,10234"; a="243302305" X-IronPort-AV: E=Sophos;i="5.88,306,1635231600"; d="scan'208";a="243302305" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Jan 2022 09:47:52 -0800 X-IronPort-AV: E=Sophos;i="5.88,306,1635231600"; d="scan'208";a="623394799" Received: from agluck-desk2.sc.intel.com ([10.3.52.146]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Jan 2022 09:47:51 -0800 From: Tony Luck To: Borislav Petkov Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Smita Koralahalli Channabasappa , Wei Huang , Tom Lendacky , patches@lists.linux.dev, Tony Luck Subject: [PATCH v2 4/6] x86/cpu: Read/save PPIN MSR during initialization Date: Fri, 21 Jan 2022 09:47:41 -0800 Message-Id: <20220121174743.1875294-5-tony.luck@intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220121174743.1875294-1-tony.luck@intel.com> References: <20220107225442.1690165-1-tony.luck@intel.com> <20220121174743.1875294-1-tony.luck@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently the PPIN (Protected Processor Inventory Number) MSR is read by every CPU that processes a machine check, CMCI, or just polls machine check banks from a periodic timer. This is not a "fast" MSR, so this adds to overhead of processing errors. Add a new "ppin" field to the cpuinfo_x86 structure. Read and save the PPIN during initialization. Use this copy in mce_setup() instead of reading the MSR. Signed-off-by: Tony Luck --- arch/x86/include/asm/processor.h | 2 ++ arch/x86/kernel/cpu/common.c | 2 ++ arch/x86/kernel/cpu/mce/core.c | 7 +------ 3 files changed, 5 insertions(+), 6 deletions(-) diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 2c5f12ae7d04..a87e7c33d5ac 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -119,6 +119,8 @@ struct cpuinfo_x86 { int x86_cache_mbm_width_offset; int x86_power; unsigned long loops_per_jiffy; + /* protected processor identification number */ + u64 ppin; /* cpuid returned max cores value: */ u16 x86_max_cores; u16 apicid; diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 8a039d1ea57f..64deb7727d00 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -91,6 +91,7 @@ DEFINE_PER_CPU_READ_MOSTLY(u16, cpu_l2c_id) = BAD_APICID; static struct ppin_info { int feature; int msr_ppin_ctl; + int msr_ppin; } ppin_info[] = { [X86_VENDOR_INTEL] = { .feature = X86_FEATURE_INTEL_PPIN, @@ -155,6 +156,7 @@ static void ppin_init(struct cpuinfo_x86 *c) /* Is the enable bit set? */ if (val & 2UL) { + c->ppin = __rdmsr(info->msr_ppin); set_cpu_cap(c, info->feature); return; } diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c index 5818b837fd4d..4f1e825033ce 100644 --- a/arch/x86/kernel/cpu/mce/core.c +++ b/arch/x86/kernel/cpu/mce/core.c @@ -138,12 +138,7 @@ void mce_setup(struct mce *m) m->socketid = cpu_data(m->extcpu).phys_proc_id; m->apicid = cpu_data(m->extcpu).initial_apicid; m->mcgcap = __rdmsr(MSR_IA32_MCG_CAP); - - if (this_cpu_has(X86_FEATURE_INTEL_PPIN)) - m->ppin = __rdmsr(MSR_PPIN); - else if (this_cpu_has(X86_FEATURE_AMD_PPIN)) - m->ppin = __rdmsr(MSR_AMD_PPIN); - + m->ppin = cpu_data(m->extcpu).ppin; m->microcode = boot_cpu_data.microcode; } -- 2.31.1