From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758188Ab3LGBQj (ORCPT ); Fri, 6 Dec 2013 20:16:39 -0500 Received: from mga09.intel.com ([134.134.136.24]:25844 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752729Ab3LGBQh (ORCPT ); Fri, 6 Dec 2013 20:16:37 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.93,843,1378882800"; d="scan'208";a="448269385" From: "Ren, Qiaowei" To: "H. Peter Anvin" , "Liu, Jinsong" , Paolo Bonzini CC: "kvm@vger.kernel.org" , "x86@kernel.org" , Xudong Hao , "qemu-devel@nongnu.org" , "linux-kernel@vger.kernel.org" , Ingo Molnar , "Thomas Gleixner" Subject: RE: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition Thread-Topic: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature definition Thread-Index: AQHO8r59I/URrjaMpE23f485Fe4/QppHKhsAgAAKzQCAAKpGYP//hooAgACIpVA= Date: Sat, 7 Dec 2013 01:16:33 +0000 Message-ID: <9E0BE1322F2F2246BD820DA9FC397ADE014A61BE@SHSMSX102.ccr.corp.intel.com> References: <1386375658-2191-1-git-send-email-qiaowei.ren@intel.com> <1386375658-2191-3-git-send-email-qiaowei.ren@intel.com> <52A20AD6.8080706@redhat.com> <52A242BE.3010701@zytor.com> <9E0BE1322F2F2246BD820DA9FC397ADE014A6115@SHSMSX102.ccr.corp.intel.com> <52A274C0.4010509@zytor.com> In-Reply-To: <52A274C0.4010509@zytor.com> Accept-Language: zh-CN, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.239.127.40] Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id rB71GiFK026178 > -----Original Message----- > From: H. Peter Anvin [mailto:hpa@zytor.com] > Sent: Saturday, December 07, 2013 9:07 AM > To: Ren, Qiaowei; Liu, Jinsong; Paolo Bonzini > Cc: kvm@vger.kernel.org; x86@kernel.org; Xudong Hao; > qemu-devel@nongnu.org; linux-kernel@vger.kernel.org; Ingo Molnar; Thomas > Gleixner > Subject: Re: [Qemu-devel] [PATCH v2 3/3] X86, mpx: Intel MPX xstate feature > definition > > On 12/06/2013 04:23 PM, Ren, Qiaowei wrote: > >>> > >>> We need to either disable these features in lazy mode, or we need to > >>> force eager mode if these features are to be supported. The problem > >>> with the latter is that it means forcing eager mode regardless of if > >>> anything actually *uses* these features. > >>> > >>> A third option would be to require applications to use a prctl() or > >>> similar to enable eager-save features. > >>> > >> > >> The third option seems better -- how does native mpx patches work, > >> force eager? > >> > > It should be the second option, as you can see xsave.c which we remove > > from this patch. :) > > > > Ah yes... I missed the fact that that chunk had been dropped from this patch. > It really shouldn't be. > > I'll substitute the previous version of the patch. > Jinsong think that both kvm and host depend on these feature definition header file, so we firstly submit these files depended on. Thanks, Qiaowei {.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I