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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,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 653D7C2D0EF for ; Fri, 17 Apr 2020 13:30:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F2C220B1F for ; Fri, 17 Apr 2020 13:30:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587130224; bh=NXlVchWe7hf7sE1zRJjwsb4MedfW39f20DQI4dszWw8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=d3RDykJJct+wqH9KIvketsEJ9hM+yK9DeX9+eTjKenqEhG6xE4ZFO8XUbD3EXwFpq mVJLjMmQ8p0KFpwFNyiUp19LX6mQYlySIJDpd1giPDqwa2sCOfP4SaM01Cp29XsQ+V jJtWLUiaLyy5mfZKEJjUcUN7n2r9iJS9BdNux+xg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730654AbgDQNaX (ORCPT ); Fri, 17 Apr 2020 09:30:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:60958 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729760AbgDQNaW (ORCPT ); Fri, 17 Apr 2020 09:30:22 -0400 Received: from localhost (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 52C0E2078E; Fri, 17 Apr 2020 13:30:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587130222; bh=NXlVchWe7hf7sE1zRJjwsb4MedfW39f20DQI4dszWw8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=E8Jtv6etCZh02R0GLu/Axm/f2A1Pozeyp14I2pHgm5gHmrBh51RIsJxgFffVeTVRo wtyD7Uw/4RZxZE7ox0OHawHGvrBOLQ1vspq8EittjckmFxe2V8cOOwz9VHBM0+I/tQ RbF69o7YMFFyWxvhUQbDT3pwiDlemcFi41/xj6vo= Date: Fri, 17 Apr 2020 09:30:21 -0400 From: Sasha Levin To: Andi Kleen Cc: "Bae, Chang Seok" , Andy Lutomirski , "Metzger, Markus T" , "hpa@zytor.com" , Thomas Gleixner , "bp@alien8.de" , "Hansen, Dave" , "Luck, Tony" , Pedro Alves , Simon Marchi , "Shankar, Ravi V" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v9 00/17] Enable FSGSBASE instructions Message-ID: <20200417133021.GT1068@sasha-vm> References: <1570212969-21888-1-git-send-email-chang.seok.bae@intel.com> <20191115191200.GD22747@tassilo.jf.intel.com> <29FD6626-4347-4B79-A027-52E44C7FDE55@intel.com> <20200413200336.GA11216@sasha-vm> <20200414003205.GF397326@tassilo.jf.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20200414003205.GF397326@tassilo.jf.intel.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 13, 2020 at 05:32:05PM -0700, Andi Kleen wrote: >> Is my attempt at understanding the current situation correct? > >Yes. > >Nothing breaks, and it's a nice improvement for context switch >performance, in NMI/PMU performance, and also gives user space two free >registers to play around with. Thomas, Andy, Could you list your outstanding objections to this patchset? I know it might be rehashing stuff you've already mentioned in this thread but I think that there's a disconnect between folks and it'll help with restarting everything. -- Thanks, Sasha