From patchwork Tue Dec 5 10:49:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 173977 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:bcd1:0:b0:403:3b70:6f57 with SMTP id r17csp3358763vqy; Tue, 5 Dec 2023 03:21:55 -0800 (PST) X-Google-Smtp-Source: AGHT+IGFNPbGyEVRO01+jLScIOWmaKCtjcO2sTpS7vHvdO82dUDWHn7xXSGKykBnK5RjX8evC6JC X-Received: by 2002:a17:90b:3144:b0:286:a708:cd08 with SMTP id ip4-20020a17090b314400b00286a708cd08mr723789pjb.40.1701775314808; Tue, 05 Dec 2023 03:21:54 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1701775314; cv=none; d=google.com; s=arc-20160816; b=Gy7KG7WUvIGY6B2tTlLyDEqljwDad5fut4MPdMnAeWgG63BpXJUH0hLgP506TbT0id ljdTIBuT5ZOoG7GcgvhaJYiadx8cWUVvavisQkd+tzCiJIeAwh86VyovrmnyGDutJXYz xHErjyElgg5TubT8xAqzYwPTyzUPVuNtEcPoXvOVU0HPIguxYJr5OuM5/M0Iu989GoWX 9OyDWlFTyevPwGw/CLB/Zrvsw2eJLM6f1RZKRB1A41rlfEPdolX7I5QSwL+ulu2f4hAi HN7HeyCgnI4mMzLi+Ph7hL1RusLEVrgQdWLOc4kaKUwEGTwmihisP8yxNVDU3cMHttW3 Sjxg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=KrII9j6mQqvWG+nTEJMQdkeovrkO1umJlPTcsWwoM+g=; fh=uCCWEUVpLc/xDP/D3WvGY/BxHU9d0NQYu/T71GEsNmA=; b=Z//qMZ5dm5H4gOwCMw6Z4qQQW1nf0K9fcUmwnTlrGoxXP/TLskRveJSCNnKWo0DMXt wM1kJjqs+GVyjQaMrHnh/fgHSwIuZDHWYX9VHV62wa3rx3EBeK5qqjZVGD2VPFal7ie6 9oE8MG/0PHTayneykf2gACrpZWwlWFd8/dQPcoSTLULaCH/UcbWehq0LicZTEFOgykFa qyWwxW9AvP3lF4BB1AdDCfLLS1WNxKoeTnJY7zHuN7bLxbXb76QhN5A8+WalRUqmG7d6 BDo3b+rnMz63pha4seS8UZhoTOLUtmgvDAxaUNPF4vDifVBZ06OF0fGb/ZscTpfcsEd/ TfRw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=UwkvqmyD; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from snail.vger.email (snail.vger.email. [23.128.96.37]) by mx.google.com with ESMTPS id a11-20020a17090a8c0b00b00286a73cfef2si3551493pjo.130.2023.12.05.03.21.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 Dec 2023 03:21:54 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) client-ip=23.128.96.37; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=UwkvqmyD; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by snail.vger.email (Postfix) with ESMTP id D6CD880C037E; Tue, 5 Dec 2023 03:21:53 -0800 (PST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.11 at snail.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1442078AbjLELVn (ORCPT + 99 others); Tue, 5 Dec 2023 06:21:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1442063AbjLELVR (ORCPT ); Tue, 5 Dec 2023 06:21:17 -0500 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B889112C; Tue, 5 Dec 2023 03:21:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701775283; x=1733311283; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=at3P90/0BHfZm4A3RDkp4mmTPKN/FQQ6JC7gRORtMwU=; b=UwkvqmyDNKYpEWiRyVAg/oyEluqxzF+5xd8tdrj5rz3cLRdkzTQUeD8D fV614pYbCBAzknlX/Y7GiwXYgekDrc6CmLevy9c+0pAFcp8hDHzJFNiz6 rDV7nS08BQMz89XkDsbTulXB3brd2tPQZpF+ILafzY0NRNB9fTBr824SP BDK+kIIrdL/7FEzS9tWHFl5ccRtfbgOteBago4Q2DyEsxymOa9OCfU7tb rL4yVXqn5UCD1W9TdoIZOFv75lOGP1Gnr1Sit2AiV2Z3t4lObifuhFJO2 nuPHVcw9zrKio9+U4Ajma+np4C1r4V19ECv1iYdvBwx7UUVcaO6Bmb4SW A==; X-IronPort-AV: E=McAfee;i="6600,9927,10914"; a="942404" X-IronPort-AV: E=Sophos;i="6.04,252,1695711600"; d="scan'208";a="942404" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Dec 2023 03:21:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10914"; a="1018192924" X-IronPort-AV: E=Sophos;i="6.04,252,1695711600"; d="scan'208";a="1018192924" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga006.fm.intel.com with ESMTP; 05 Dec 2023 03:21:18 -0800 From: Xin Li To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-edac@vger.kernel.org, linux-hyperv@vger.kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, luto@kernel.org, pbonzini@redhat.com, seanjc@google.com, peterz@infradead.org, jgross@suse.com, ravi.v.shankar@intel.com, mhiramat@kernel.org, andrew.cooper3@citrix.com, jiangshanlai@gmail.com, nik.borisov@suse.com, shan.kang@intel.com Subject: [PATCH v13 08/35] x86/fred: Disable FRED by default in its early stage Date: Tue, 5 Dec 2023 02:49:57 -0800 Message-ID: <20231205105030.8698-9-xin3.li@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231205105030.8698-1-xin3.li@intel.com> References: <20231205105030.8698-1-xin3.li@intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Tue, 05 Dec 2023 03:21:53 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784440752124334851 X-GMAIL-MSGID: 1784440752124334851 To enable FRED, a new kernel command line option "fred" needs to be added. Tested-by: Shan Kang Signed-off-by: Xin Li --- Documentation/admin-guide/kernel-parameters.txt | 3 +++ arch/x86/kernel/cpu/common.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 65731b060e3f..6992b392e8d3 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1526,6 +1526,9 @@ Warning: use of this parameter will taint the kernel and may cause unknown problems. + fred [X86-64] + Enable flexible return and event delivery + ftrace=[tracer] [FTRACE] will set and start the specified tracer as early as possible in order to facilitate early diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index 4d4b87c6885d..68102acd63b0 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1491,6 +1491,9 @@ static void __init cpu_parse_early_param(void) char *argptr = arg, *opt; int arglen, taint = 0; + if (!cmdline_find_option_bool(boot_command_line, "fred")) + setup_clear_cpu_cap(X86_FEATURE_FRED); + #ifdef CONFIG_X86_32 if (cmdline_find_option_bool(boot_command_line, "no387")) #ifdef CONFIG_MATH_EMULATION