From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757147AbZCPBGw (ORCPT ); Sun, 15 Mar 2009 21:06:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754376AbZCPBGn (ORCPT ); Sun, 15 Mar 2009 21:06:43 -0400 Received: from terminus.zytor.com ([198.137.202.10]:57828 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751861AbZCPBGn (ORCPT ); Sun, 15 Mar 2009 21:06:43 -0400 Message-ID: <49BDA415.9060502@zytor.com> Date: Sun, 15 Mar 2009 17:57:57 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Arjan van de Ven CC: Jeremy Fitzhardinge , Jan Beulich , Xen-devel , Jeremy Fitzhardinge , the arch/x86 maintainers , Linux Kernel Mailing List Subject: Re: [Xen-devel] [PATCH 10/24] xen: mask XSAVE from cpuid References: <1236931920-6861-1-git-send-email-jeremy@goop.org> <1236931920-6861-11-git-send-email-jeremy@goop.org> <49BA3A84.76E4.0078.0@novell.com> <49BA7810.6090807@goop.org> <49BD4CE1.6040100@zytor.com> <49BD6D0E.1010107@goop.org> <20090315154718.00353625@infradead.org> <49BD97C6.2070401@goop.org> <20090315170945.08344b86@infradead.org> In-Reply-To: <20090315170945.08344b86@infradead.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Arjan van de Ven wrote: > > Well.. pretty much all new instructions need Xen modifications due to > the need to be emulate to deal with traps/vmexits/etc right? > So I don't quite see many cpuid bits that would NOT involve some Xen > modification or another ;) > There are going to be a very small number which need only userspace support. However, there will be absolutely no way for Xen to know this a priori. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.