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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 9DF55C43387 for ; Fri, 21 Dec 2018 21:59:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6AE662190A for ; Fri, 21 Dec 2018 21:59:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=candelatech.com header.i=@candelatech.com header.b="aUhANQbS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392066AbeLUV7j (ORCPT ); Fri, 21 Dec 2018 16:59:39 -0500 Received: from mail2.candelatech.com ([208.74.158.173]:49504 "EHLO mail2.candelatech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725837AbeLUV7j (ORCPT ); Fri, 21 Dec 2018 16:59:39 -0500 Received: from [192.168.100.195] (firewall.candelatech.com [50.251.239.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail2.candelatech.com (Postfix) with ESMTPSA id AE8E540A955; Fri, 21 Dec 2018 13:59:35 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 mail2.candelatech.com AE8E540A955 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=candelatech.com; s=default; t=1545429576; bh=LTP67iII0tAoP/b2eeE5v41eHI4Tu/u7wmeJJ/LopOc=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=aUhANQbSoYvLLpWPNHRvlEIvNBumF9v+W3BEDfj89IuhtYrkw+1YLutKcf03GUjE6 pgkyVYi5WpM/n1hj7oM/Wjb49IfyZD78hWHdqBDZzMf/G7OT6bQEhCEXO660AT6gdp iTUSEELkB92hyvATfxq1P4j7ECyvkTrVwLCYS7RQ= Subject: Re: [PATCH] x86/speculation: Add document to describe Spectre and its mitigations To: Tim Chen , Thomas Gleixner Cc: Jiri Kosina , Linus Torvalds , Tom Lendacky , Ingo Molnar , Peter Zijlstra , Josh Poimboeuf , Andrea Arcangeli , David Woodhouse , Andi Kleen , Dave Hansen , Asit Mallick , Arjan van de Ven , Jon Masters , Waiman Long , Greg KH , Borislav Petkov , linux-kernel@vger.kernel.org, x86@kernel.org, stable@vger.kernel.org References: <64efec3fda40c0758601bf9b1480a35d76d3c487.1545413988.git.tim.c.chen@linux.intel.com> From: Ben Greear Organization: Candela Technologies Message-ID: <1c7923ec-70aa-25d4-3de1-f1b1768bb80b@candelatech.com> Date: Fri, 21 Dec 2018 13:59:35 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1 MIME-Version: 1.0 In-Reply-To: <64efec3fda40c0758601bf9b1480a35d76d3c487.1545413988.git.tim.c.chen@linux.intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/21/18 9:44 AM, Tim Chen wrote: > Thomas, > > Andi and I have made an update to our draft of the Spectre admin guide. > We may be out on Christmas vacation for a while. But we want to > send it out for everyone to take a look. Can you add a section on how to compile out all mitigations that have anything beyond negligible performance impact for those running systems where performance is more important than security? Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com