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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS 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 C4912C43334 for ; Tue, 4 Sep 2018 02:42:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7D26A20869 for ; Tue, 4 Sep 2018 02:42:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7D26A20869 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=zytor.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726344AbeIDHFU (ORCPT ); Tue, 4 Sep 2018 03:05:20 -0400 Received: from terminus.zytor.com ([198.137.202.136]:38665 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725990AbeIDHFU (ORCPT ); Tue, 4 Sep 2018 03:05:20 -0400 Received: from carbon-x1.hos.anvin.org (c-24-5-245-234.hsd1.ca.comcast.net [24.5.245.234] (may be forged)) (authenticated bits=0) by mail.zytor.com (8.15.2/8.15.2) with ESMTPSA id w842fYfL3526055 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO); Mon, 3 Sep 2018 19:41:35 -0700 Subject: Re: [PATCH 1/3] x86/boot: Add bit fields into xloadflags for 5-level kernel checking To: Baoquan He , tglx@linutronix.de, mingo@kernel.org, kirill.shutemov@linux.intel.com Cc: x86@kernel.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org References: <20180829141624.13985-1-bhe@redhat.com> <20180829141624.13985-2-bhe@redhat.com> From: "H. Peter Anvin" Message-ID: <6ea94875-ae07-6220-eb3e-d3f830cdac03@zytor.com> Date: Mon, 3 Sep 2018 19:41:29 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180829141624.13985-2-bhe@redhat.com> Content-Type: text/plain; charset=utf-8 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 I don't understand why there is any reason not to always enter the target kernel in 4-level mode. There certainly is no point whatsoever in having two xloadflags: the only thing that could possibly matter is whether or not the kernel in question *can* be entered in 5-level mode should that ever be necessary. -hpa