Received: by 2002:a05:6902:102b:0:0:0:0 with SMTP id x11csp1875290ybt; Mon, 15 Jun 2020 11:39:59 -0700 (PDT) X-Google-Smtp-Source: ABdhPJyQr6BfsBnzYu9DVhguePvDi0cb+b4BMgIPje5Krspx7X+a+RndcrZ6hmavRyt27ACYjKMp X-Received: by 2002:a50:b022:: with SMTP id i31mr25404386edd.301.1592246399545; Mon, 15 Jun 2020 11:39:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1592246399; cv=none; d=google.com; s=arc-20160816; b=gwxZg05LeP8hQIjk1RWCGMyIRmtq2LSVwVLrq5b3UNcs6h0vWKOdy527UKTnAFdAgr 9Dda0F1EhUPtukCrJK1ob4RTXrATv3dx2Kh5/SXI3GH4aQENMqoUPtYF5zOadHvupBMR 56TVjtEhbqllK67Sc8sZcN/01tZoLpIKzF8TZstPFpQdnTuPi9sVmASfHODuUZpL7Hhi AYK1TGovbwHNfKJx31dNCkoRNSGLPm9e2c/B7b43+cCKCokT9lPEWS6ePSjv68hi3sQT gCe9HoTPTvOv7A8yadZkrdRD67TUJOnsxy7fQeD7nMfxWg9qfiNVa3nIySmGNaUVUT4Y GNNw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:autocrypt:from:references:cc:to:subject:ironport-sdr :ironport-sdr; bh=fZDlVTmVDwoXVOoUwIknjnDJt/1enrNN8o9tDBXSEec=; b=KHzkEU50djbmK6fMCSdWt5WHIM6GrP6NbNBYggM0SMk0RlVT2BdGQP80Jnazu07E0o w1uW5xnpZrNg/zkZquBwR0/edpMmSi2OrTNFbs+kvF/gVzYIXw2fqvFjz03cEjUzVgfn XcWGq/0Q1sDKyTSJ51GflSWgFGP5rE46o2wTHirVQkv6zRYQton2XhfMQIiVWuhFjDKj r0/svV0t7AAqRRYCdNgt2fU6lx/fgsDpYxsOLI40DwQWApD2vW3gukWWWk+fZyErLojk VutZ/NNSRpwFG/9pzMPdr8963EFkC3VtniTbNxFOkkeaKTmYjDHdgbIhP+30L/wP7Nrc pvEQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id s9si9710360edx.608.2020.06.15.11.39.36; Mon, 15 Jun 2020 11:39:59 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731279AbgFOShv (ORCPT + 99 others); Mon, 15 Jun 2020 14:37:51 -0400 Received: from mga07.intel.com ([134.134.136.100]:1380 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729124AbgFOShu (ORCPT ); Mon, 15 Jun 2020 14:37:50 -0400 IronPort-SDR: vsNeiFw5EOdrsK71jpM1ucKEpsc7ZGH175EtVkJnV3YGMR+bVN8KabW+Aq4Zhn1e94td5CQSoZ 52xHpvQv37OQ== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jun 2020 11:37:50 -0700 IronPort-SDR: 0stjdy5yPoRi/iS6belusQAuPPz4i9J21CSwHEVzY/+OjK/6yXyiitG21VX6V4WHjHvOzdNPcU 2eS0Fh+PVTKA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,515,1583222400"; d="scan'208";a="276652625" Received: from rstaubx-mobl2.amr.corp.intel.com (HELO [10.255.3.230]) ([10.255.3.230]) by orsmga006.jf.intel.com with ESMTP; 15 Jun 2020 11:37:48 -0700 Subject: Re: [RFC PATCH 1/3] Documentation/x86: Add documentation for /proc/cpuinfo feature flags To: "Luck, Tony" , Borislav Petkov , "Park, Kyung Min" Cc: "x86@kernel.org" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "mingo@redhat.com" , "hpa@zytor.com" , "gregkh@linuxfoundation.org" , "ak@linux.intel.com" , "Shankar, Ravi V" , "Neri, Ricardo" , Ricardo Neri References: <20200610200701.16757-1-kyung.min.park@intel.com> <20200610200701.16757-2-kyung.min.park@intel.com> <20200615181527.GM14668@zn.tnic> <3908561D78D1C84285E8C5FCA982C28F7F66C552@ORSMSX115.amr.corp.intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzShEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gPGRhdmVAc3I3MS5uZXQ+wsF7BBMBAgAlAhsDBgsJCAcDAgYVCAIJ CgsEFgIDAQIeAQIXgAUCTo3k0QIZAQAKCRBoNZUwcMmSsMO2D/421Xg8pimb9mPzM5N7khT0 2MCnaGssU1T59YPE25kYdx2HntwdO0JA27Wn9xx5zYijOe6B21ufrvsyv42auCO85+oFJWfE K2R/IpLle09GDx5tcEmMAHX6KSxpHmGuJmUPibHVbfep2aCh9lKaDqQR07gXXWK5/yU1Dx0r VVFRaHTasp9fZ9AmY4K9/BSA3VkQ8v3OrxNty3OdsrmTTzO91YszpdbjjEFZK53zXy6tUD2d e1i0kBBS6NLAAsqEtneplz88T/v7MpLmpY30N9gQU3QyRC50jJ7LU9RazMjUQY1WohVsR56d ORqFxS8ChhyJs7BI34vQusYHDTp6PnZHUppb9WIzjeWlC7Jc8lSBDlEWodmqQQgp5+6AfhTD kDv1a+W5+ncq+Uo63WHRiCPuyt4di4/0zo28RVcjtzlGBZtmz2EIC3vUfmoZbO/Gn6EKbYAn rzz3iU/JWV8DwQ+sZSGu0HmvYMt6t5SmqWQo/hyHtA7uF5Wxtu1lCgolSQw4t49ZuOyOnQi5 f8R3nE7lpVCSF1TT+h8kMvFPv3VG7KunyjHr3sEptYxQs4VRxqeirSuyBv1TyxT+LdTm6j4a mulOWf+YtFRAgIYyyN5YOepDEBv4LUM8Tz98lZiNMlFyRMNrsLV6Pv6SxhrMxbT6TNVS5D+6 UorTLotDZKp5+M7BTQRUY85qARAAsgMW71BIXRgxjYNCYQ3Xs8k3TfAvQRbHccky50h99TUY sqdULbsb3KhmY29raw1bgmyM0a4DGS1YKN7qazCDsdQlxIJp9t2YYdBKXVRzPCCsfWe1dK/q 66UVhRPP8EGZ4CmFYuPTxqGY+dGRInxCeap/xzbKdvmPm01Iw3YFjAE4PQ4hTMr/H76KoDbD cq62U50oKC83ca/PRRh2QqEqACvIH4BR7jueAZSPEDnzwxvVgzyeuhwqHY05QRK/wsKuhq7s UuYtmN92Fasbxbw2tbVLZfoidklikvZAmotg0dwcFTjSRGEg0Gr3p/xBzJWNavFZZ95Rj7Et db0lCt0HDSY5q4GMR+SrFbH+jzUY/ZqfGdZCBqo0cdPPp58krVgtIGR+ja2Mkva6ah94/oQN lnCOw3udS+Eb/aRcM6detZr7XOngvxsWolBrhwTQFT9D2NH6ryAuvKd6yyAFt3/e7r+HHtkU kOy27D7IpjngqP+b4EumELI/NxPgIqT69PQmo9IZaI/oRaKorYnDaZrMXViqDrFdD37XELwQ gmLoSm2VfbOYY7fap/AhPOgOYOSqg3/Nxcapv71yoBzRRxOc4FxmZ65mn+q3rEM27yRztBW9 AnCKIc66T2i92HqXCw6AgoBJRjBkI3QnEkPgohQkZdAb8o9WGVKpfmZKbYBo4pEAEQEAAcLB XwQYAQIACQUCVGPOagIbDAAKCRBoNZUwcMmSsJeCEACCh7P/aaOLKWQxcnw47p4phIVR6pVL e4IEdR7Jf7ZL00s3vKSNT+nRqdl1ugJx9Ymsp8kXKMk9GSfmZpuMQB9c6io1qZc6nW/3TtvK pNGz7KPPtaDzvKA4S5tfrWPnDr7n15AU5vsIZvgMjU42gkbemkjJwP0B1RkifIK60yQqAAlT YZ14P0dIPdIPIlfEPiAWcg5BtLQU4Wg3cNQdpWrCJ1E3m/RIlXy/2Y3YOVVohfSy+4kvvYU3 lXUdPb04UPw4VWwjcVZPg7cgR7Izion61bGHqVqURgSALt2yvHl7cr68NYoFkzbNsGsye9ft M9ozM23JSgMkRylPSXTeh5JIK9pz2+etco3AfLCKtaRVysjvpysukmWMTrx8QnI5Nn5MOlJj 1Ov4/50JY9pXzgIDVSrgy6LYSMc4vKZ3QfCY7ipLRORyalFDF3j5AGCMRENJjHPD6O7bl3Xo 4DzMID+8eucbXxKiNEbs21IqBZbbKdY1GkcEGTE7AnkA3Y6YB7I/j9mQ3hCgm5muJuhM/2Fr OPsw5tV/LmQ5GXH0JQ/TZXWygyRFyyI2FqNTx4WHqUn3yFj8rwTAU1tluRUYyeLy0ayUlKBH ybj0N71vWO936MqP6haFERzuPAIpxj2ezwu0xb1GjTk4ynna6h5GjnKgdfOWoRtoWndMZxbA z5cecg== Message-ID: <8421be21-30ed-02fb-456c-bd3ee3b34f66@intel.com> Date: Mon, 15 Jun 2020 11:37:48 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <3908561D78D1C84285E8C5FCA982C28F7F66C552@ORSMSX115.amr.corp.intel.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 6/15/20 11:31 AM, Luck, Tony wrote: >> In general, this should say something along the lines that /proc/cpuinfo >> shows features which the kernel supports. >> >> "For a full list of CPUID flags which the CPU supports, use >> tools/arch/x86/tools/cpuid/cpuid" >> >> :-) > Dave Hansen had suggested (offline) that we add a cpuid tool to the kernel sources. > > I think that's a lot of (duplicated) work for someone to maintain. The version of this > tool at http://www.etallen.com/cpuid.html is close to 10K lines of code. Borislav suggested starting with something as simple as this: http://sr71.net/~dave/intel/stupid-cpuid.c That, plus code that consume the X86_FEATURE_* flag names and print out what's supported would be pretty handy and way smaller than 10k lines.