Received: by 2002:a25:1985:0:0:0:0:0 with SMTP id 127csp583247ybz; Fri, 17 Apr 2020 06:33:59 -0700 (PDT) X-Google-Smtp-Source: APiQypIiEhj1BKeymW8MaptjIIYsN6t52awjtZVGQSD9Cn0mPcS0DbnMwdKfXajGYC8lHAjC9/P+ X-Received: by 2002:aa7:c3c2:: with SMTP id l2mr3080458edr.362.1587130439065; Fri, 17 Apr 2020 06:33:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1587130439; cv=none; d=google.com; s=arc-20160816; b=0WF+AfhUm5TfkuBZBRWbKCbt+cThXAZSve73hKfiIaayZfa/06vyxN+PJUo7zO4FdS H8FM9UfDwy5X0KIaG1lxHrzciAocY1AY6ZRf/zLE4SV5tt6mEIo3w36nBwXmErjePXQB NVW+5q+S4cum9sXaclhjzvh1IqIATW6ZQWKum6Ev7HbAxByAI90PDzx9DqSQF/OvYmwi b3/zFh+QtIzNAFwAHswfC/r5feEewfVyNg36G0bq7xnNQoHAQjSEPA/hnueBjJWGogcv vSWmeXIn3Q8jCsWBEqKyX+Hgwm9TYHZPuI8pPfLofcZfOd0TVmcIB/z1l9cQCZSIANP+ /VIA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date:dkim-signature; bh=tR3H8kFShmcz0/AFRf/6e06J6UlXU1ugJJAaCNku14w=; b=NYBIw1Tj5hU9W8rSg2MzHnoQk1Suno6LURwyD/q//0hG9h5pIKps/8Twe1T96MhX6A d4ipijac7R2jtFCuOYnVuJRAiXCQyEXV5abUjEhsvKCUXXbel05kIC+rFxBqpbwEmeqc U+KXgNG+rYzLOYRgKqyI6h7od6ZtvwgqiuelYt21PuU84ASM6xaPbDxq/IuiycN/2r4b OfzRtZsRPOMxC7wGJQpi5qYTT6JXueKqhnbxZGOssxLTcaRKg3TpDyiDHIobJHiFb6/3 6b9WunAbYXxBkc6t9ch2dywbBYg9eYVw18Mpey3WmIZEnFzT8NqIRFfxST/11U8wgXZY ltbQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=E8Jtv6et; 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=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id p4si10428706ejd.3.2020.04.17.06.33.35; Fri, 17 Apr 2020 06:33:59 -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; dkim=pass header.i=@kernel.org header.s=default header.b=E8Jtv6et; 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=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730645AbgDQNaX (ORCPT + 99 others); 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