From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964985AbbCEQHe (ORCPT ); Thu, 5 Mar 2015 11:07:34 -0500 Received: from mga02.intel.com ([134.134.136.20]:35265 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964784AbbCEQHb (ORCPT ); Thu, 5 Mar 2015 11:07:31 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,347,1422950400"; d="scan'208";a="694422993" Message-ID: <1425571609.3838.153.camel@linux.intel.com> Subject: Re: [PATCH] x86: Bypass legacy PIC and PIT on ACPI hardware reduced platform From: Alan Cox To: "Li, Aubrey" Cc: Ingo Molnar , Arjan van de Ven , Borislav Petkov , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , "Rafael J. Wysocki" , Len.Brown@intel.com, x86@kernel.org, LKML Date: Thu, 05 Mar 2015 16:06:49 +0000 In-Reply-To: <54F84F3A.8080902@linux.intel.com> References: <20150304050858.GB5158@gmail.com> <54F69774.2050400@linux.intel.com> <20150304053106.GA3701@gmail.com> <54F6A08B.2010105@linux.intel.com> <20150304073717.GA11736@gmail.com> <54F6C59C.706@linux.intel.com> <20150304095011.GH3233@pd.tnic> <54F71888.4040608@linux.intel.com> <20150304201102.GA6530@gmail.com> <54F83A61.3090906@linux.intel.com> <20150305113641.GB23046@gmail.com> <54F84F3A.8080902@linux.intel.com> Organization: Intel Corporation Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.9 (3.12.9-1.fc21) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > I'll do more investigation above items but I want to leave at least > these two as the quirk today unless I am convinced I can do that because > from my understanding, UEFI runtime services should not be supported in > reduced hw mode. What actually matters in this space is what Microsoft does. The spec is unfortunately rather irrelevant. If MS do UEFI runtime services in reduced hw mode then the firmware and system will do so. Alan