Received: by 2002:a25:6193:0:0:0:0:0 with SMTP id v141csp184297ybb; Tue, 14 Apr 2020 22:31:20 -0700 (PDT) X-Google-Smtp-Source: APiQypLpTOQ6K844q5r9NGzTZ/23uA/GKsD+eM+DnZ+K25OKh5jiC/tHbQBm3/pujA76UlDvUXWg X-Received: by 2002:aa7:c0c3:: with SMTP id j3mr22315054edp.304.1586928680859; Tue, 14 Apr 2020 22:31:20 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1586928680; cv=none; d=google.com; s=arc-20160816; b=w5Di+y/npGFmWcTPBbcV580fLmO91LhwlAt0Yiwkf5rDQj7usRRVvjPqjIWUMF54eq 7ujYYW0iiFRPcacVmc+smfky0QzSgaR7jCyz/h9u/OGSJs9eI64AGk+dIrIm7IpNnXb6 EzkwmMDdDrK1rqbM0ANOA4icCFbtgsoIub26JGw8ObbX7srOf4mzPGfZjCXXbWwIPfwe gjQAjJkqbjsCNJgv+xaOoq0WsqqXdCTYEc7o1TAeGdHJCm87pUXGbN9YaBJDKxR0Kq/Y NA7YnIZZyMxkGS0H9pCAoD1RRb8UdfxWey/xGJW6yYh/FswrHUaWnPo9bCT4OecXfj/z JNPQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:in-reply-to:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :ironport-sdr:ironport-sdr; bh=AwxoJw+XieB03uCs5qqfthTYiF90iQq+/Z2kjfzaT64=; b=ZJ4qg4s86YloXlLxSoVEnrT8CgO6f9E56trdLn2SiAbscxjIFUV7oDDZeUjDTgGmnT UqPpXl4vchEl84R4i6pQmimshJX+QgjFp6h6nGKgd+FAkaa4DxVLFuxY3IX7nVNVIR8d 3dMLV5eY2pRMx1BQXcuHZdKhfBVTmjHM0f/uBJqBXp1Hzw0rG+Ds3P5cPYbFDcFBb+4b X1EwOTTffPAijQ0R0jBG4DI2dIpj2IeTmyPR7R7NbwrsinU3/K/1AD4AaELrJzXZO1sn XcnFKvusZ4bCGps796BHdyj7MzLV2OqX/mWWNRRzEbG71GDwzFbNIkcTsUI8Rd0+c/6P 4rbQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for 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 p25si9409819edq.17.2020.04.14.22.30.49; Tue, 14 Apr 2020 22:31:20 -0700 (PDT) Received-SPF: pass (google.com: best guess record for 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: best guess record for 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 S2390499AbgDNAcH (ORCPT + 99 others); Mon, 13 Apr 2020 20:32:07 -0400 Received: from mga09.intel.com ([134.134.136.24]:15737 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390458AbgDNAcH (ORCPT ); Mon, 13 Apr 2020 20:32:07 -0400 IronPort-SDR: EYMp1SJoWnYFE8rjykcnBOL8OK1eZ0A6hSBY//KAQRZa9KG8HjDBPowk/4iH7XMMFkYtGr+s9g 7imc+LzrVVBg== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Apr 2020 17:32:06 -0700 IronPort-SDR: 3QfILJpHAcg1gY9oSJ3+Ydms7rXbbNc3LHpLjIZ0fVRGGQBuquF5Zn7yR5TSu526LbdaM8dYg7 f1JgFUaAppJg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.72,380,1580803200"; d="scan'208";a="363222694" Received: from tassilo.jf.intel.com (HELO tassilo.localdomain) ([10.7.201.21]) by fmsmga001.fm.intel.com with ESMTP; 13 Apr 2020 17:32:05 -0700 Received: by tassilo.localdomain (Postfix, from userid 1000) id A2F593018EA; Mon, 13 Apr 2020 17:32:05 -0700 (PDT) Date: Mon, 13 Apr 2020 17:32:05 -0700 From: Andi Kleen To: Sasha Levin 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: <20200414003205.GF397326@tassilo.jf.intel.com> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200413200336.GA11216@sasha-vm> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > 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. -Andi