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 X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 63AAAC4727C for ; Mon, 21 Sep 2020 23:28:01 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F202623A63 for ; Mon, 21 Sep 2020 23:28:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F202623A63 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4C6956B00C8; Mon, 21 Sep 2020 19:28:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 44FF86B00C9; Mon, 21 Sep 2020 19:28:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 317FF6B00CA; Mon, 21 Sep 2020 19:28:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0147.hostedemail.com [216.40.44.147]) by kanga.kvack.org (Postfix) with ESMTP id 15CD26B00C8 for ; Mon, 21 Sep 2020 19:28:00 -0400 (EDT) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id CBE238249980 for ; Mon, 21 Sep 2020 23:27:59 +0000 (UTC) X-FDA: 77288658678.30.hose74_3702c4d27149 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin30.hostedemail.com (Postfix) with ESMTP id A34B5180B3C83 for ; Mon, 21 Sep 2020 23:27:59 +0000 (UTC) X-HE-Tag: hose74_3702c4d27149 X-Filterd-Recvd-Size: 4095 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by imf43.hostedemail.com (Postfix) with ESMTP for ; Mon, 21 Sep 2020 23:27:58 +0000 (UTC) IronPort-SDR: COiZ7653Nxt9dR3Jjl5aBsMHvxBo2m5+FdzrxVMyKS8/RjL04yXfH9RPgTQJVEGmhJyF88ZDv1 UJd60rrRRKtQ== X-IronPort-AV: E=McAfee;i="6000,8403,9751"; a="224644864" X-IronPort-AV: E=Sophos;i="5.77,288,1596524400"; d="scan'208";a="224644864" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Sep 2020 16:27:57 -0700 IronPort-SDR: s70dQPnrd9HnchA+yXDoMTCvVLXkQq9CMRN7cT6JqAIAicSh1zFZJSN7KpwAh8O9Z6jiqlhUlW Jd+/61SFkjow== X-IronPort-AV: E=Sophos;i="5.77,288,1596524400"; d="scan'208";a="510929617" Received: from yyu32-mobl1.amr.corp.intel.com (HELO [10.212.102.78]) ([10.212.102.78]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Sep 2020 16:27:56 -0700 Subject: Re: [PATCH v12 1/8] x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking To: Dave Hansen , Pavel Machek Cc: Randy Dunlap , x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Peter Zijlstra , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang References: <20200918192312.25978-1-yu-cheng.yu@intel.com> <20200918192312.25978-2-yu-cheng.yu@intel.com> <20200918205933.GB4304@duo.ucw.cz> <019b5e45-b116-7f3d-f1f2-3680afbd676c@intel.com> <20200918214020.GF4304@duo.ucw.cz> <3a0b0baf-a0f5-fd15-3af1-0059a807100b@intel.com> <9cf234db-d0f7-0466-be2c-afe04eb76759@intel.com> From: "Yu, Yu-cheng" Message-ID: <5e0a4005-45e3-3e88-e6e0-4ec31aad7eb9@intel.com> Date: Mon, 21 Sep 2020 16:27:55 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <9cf234db-d0f7-0466-be2c-afe04eb76759@intel.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 9/21/2020 3:54 PM, Dave Hansen wrote: > On 9/21/20 3:47 PM, Yu, Yu-cheng wrote: >>> The 900KB is probably wrong today in a lot of configurations, and will; >>> only get *more* wrong over time. >> >> I was talking about the vmlinux file, and probably should have said >> bzImage size, which has 14 KB increase when CET is enabled. > > Well, vmlinux size is important too. 1 page of vmlinux size means one > fewer page of memory available for real use. > > I would really encourage you when you write to try to be specific and > use as much plain language as possible without being verbose. Most > people understand things like "this feature increases kernel text size". > I wouldn't expect most folks who can type "make oldconfig; make > install" to understands the difference between vmlinux and bzImage. > Ok, thanks! Yu-cheng