From patchwork Sat Sep 23 09:41:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 143943 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:cae8:0:b0:403:3b70:6f57 with SMTP id r8csp266637vqu; Sat, 23 Sep 2023 09:26:35 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEJi6LSANxyBsL0UCBCC2xC8ig3RR9Ijl7j68TojJfwFkQIPrjwxNxuTEWQG7dOnSKkw7Rj X-Received: by 2002:a9d:7a4b:0:b0:6c4:d2a8:b789 with SMTP id z11-20020a9d7a4b000000b006c4d2a8b789mr3013885otm.35.1695486395678; Sat, 23 Sep 2023 09:26:35 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1695486395; cv=none; d=google.com; s=arc-20160816; b=pG8P1sAjvjE+WfMiBaSKxQYInUq20+oXwwrIDb1Q3Wx6q22V0x00lAGVZZS3hptjKR KQ9WXIV/xIpzXv0w9cGNYUB0869bRz+dPwMaQ20CB2eIfwr3L2xONXr+7bIV0MXCL1GU htDel+6/mQmME1bdBKnebAmTIHqd3HdiAPDnUUfeeuzLC63OxgL97PLx3giI/GZvdZ2a t73x6euirrg3MPsVnToEOe0udkEvWt2/+ApH57koUhRIK6Tih72fP+UJ6BIVBfvplUGp F9OjUH5w0/XtTJvPYJANoRhWIEXoN84xoeMyjvIk1d5wCdmSrKsn38zo4AxO1JbEe9Xr onzg== 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=L6d626jI3qyIZKoZSq1vkSSDhtm126FQWSTjqVPzUA4=; fh=Tb1p8S3iOxe/kX/WSNC3xEJzSVgGJ5DaxSrKb+pzH+4=; b=Q1L4WSEHddNoLvFB7vaQDRUGYMX+9SRbO7ITWSQQ8cL483zXtLpeCG9r/Ba+6J1AvY cDJgta09/KrU4zZALJrZ/CXvhhCa0cHTVj4zWXzVymCKQQROTH5uEPvrIEjur0erKX7p A3jzgoJl08GbYuUIcKdD8V8uOgPd+t4Pz28Cr7xHmMEoxtDNOvWxhk/xyDopxSeURD+h 2mZw5k6tzERuP5z/MqqsbbAmtxTZOSsfkwp2sU8aBT9B22PrcXFe7UhLaA2mRNfAjhg6 09VC6RTqCbBfwmTct2uU2OearOl7ea7PLWpd9qxYdPeH9J1rrKpyc2WLnsK8Nsg9T3Ns J9rQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=bkORp0Jn; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 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 lipwig.vger.email (lipwig.vger.email. [2620:137:e000::3:3]) by mx.google.com with ESMTPS id cq12-20020a056a00330c00b0068a54cfcd74si6078939pfb.192.2023.09.23.09.26.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 Sep 2023 09:26:35 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 as permitted sender) client-ip=2620:137:e000::3:3; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b=bkORp0Jn; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:3 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 lipwig.vger.email (Postfix) with ESMTP id 0534D8359B53; Sat, 23 Sep 2023 03:13:34 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at lipwig.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231663AbjIWKMW (ORCPT + 29 others); Sat, 23 Sep 2023 06:12:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231354AbjIWKLs (ORCPT ); Sat, 23 Sep 2023 06:11:48 -0400 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.100]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B248C19A; Sat, 23 Sep 2023 03:11:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1695463902; x=1726999902; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=8L4dZHWPEow2ZsckWCTENKztBfQe3j0MHQV1pASC0Y8=; b=bkORp0JnG3Q7wXdCF+t1Z9nnY+x+ru9Hr4pxTHJ6Y0RSjHPgUW9pG01T sCcSfLM5XzIVZEXQtrikR2S3uEaNhSV1j44DjWqIbLHc9zRJJFcNRPzi5 M2I7UwK3dzxvK3zh1Qw8bO7GX7uZIzaINZhS2LbCwDdZ8HKPsJ7J/A8pE ySbFpONVaLckpsx+WXeYsB/vsYy+s2WEGWeR9u50WhI9kGtV4qfRYlY6X vNsBhaGj5rJVqeb/AKm1wakRf5F20WUG6CjAr+n2p8Ll/CH2dyD99Gq4A MJf6F9lCi4mc+oN6FY5QjOrb830VgycoW6F7dwQmtTo+Kee+kx0EcVm5z g==; X-IronPort-AV: E=McAfee;i="6600,9927,10841"; a="447492191" X-IronPort-AV: E=Sophos;i="6.03,171,1694761200"; d="scan'208";a="447492191" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Sep 2023 03:11:41 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10841"; a="813388135" X-IronPort-AV: E=Sophos;i="6.03,171,1694761200"; d="scan'208";a="813388135" Received: from unknown (HELO fred..) ([172.25.112.68]) by fmsmga008.fm.intel.com with ESMTP; 23 Sep 2023 03:11:40 -0700 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 Subject: [PATCH v11 10/37] x86/fred: Disable FRED by default in its early stage Date: Sat, 23 Sep 2023 02:41:45 -0700 Message-Id: <20230923094212.26520-11-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230923094212.26520-1-xin3.li@intel.com> References: <20230923094212.26520-1-xin3.li@intel.com> MIME-Version: 1.0 X-Spam-Status: No, score=2.7 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_SBL_CSS,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email 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 (lipwig.vger.email [0.0.0.0]); Sat, 23 Sep 2023 03:13:34 -0700 (PDT) X-Spam-Level: ** X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777846342787114626 X-GMAIL-MSGID: 1777846342787114626 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 45e34be4ed56..ee939ea00458 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1525,6 +1525,9 @@ 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 afa755e06ae9..4dec7822a291 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -1487,6 +1487,9 @@ 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