Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754551AbZFCRiR (ORCPT ); Wed, 3 Jun 2009 13:38:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751489AbZFCRiH (ORCPT ); Wed, 3 Jun 2009 13:38:07 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:51965 "EHLO www.etchedpixels.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750958AbZFCRiF (ORCPT ); Wed, 3 Jun 2009 13:38:05 -0400 Date: Wed, 3 Jun 2009 18:36:22 +0100 From: Alan Cox To: "Chris Friesen" Cc: Ingo Molnar , Steven Rostedt , George Dunlap , David Miller , "jeremy@goop.org" , Dan Magenheimer , "avi@redhat.com" , "xen-devel@lists.xensource.com" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Keir Fraser , "torvalds@linux-foundation.org" , "gregkh@suse.de" , "kurt.hackel@oracle.com" , Ian Pratt , "xen-users@lists.xensource.com" , ksrinivasan , "EAnderson@novell.com" , "wimcoekaerts@wimmekes.net" , Stephen Spector , "jens.axboe@oracle.com" , "npiggin@suse.de" Subject: Re: Merge Xen (the hypervisor) into Linux Message-ID: <20090603183622.0219db1d@lxorguk.ukuu.org.uk> In-Reply-To: <4A26B361.5000600@nortel.com> References: <162f4c90-6431-4a2a-b337-6d7451d7b11e@default> <20090528001350.GD26820@elte.hu> <4A1F302E.8030501@goop.org> <20090528.210559.137121893.davem@davemloft.net> <4A1FCE8E.2060604@eu.citrix.com> <20090602224051.GB32428@goodmis.org> <20090602232843.GA6577@elte.hu> <4A26B361.5000600@nortel.com> X-Mailer: Claws Mail 3.7.0 (GTK+ 2.14.7; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1221 Lines: 29 On Wed, 03 Jun 2009 11:31:13 -0600 "Chris Friesen" wrote: > Ingo Molnar wrote: > > > A lot of Xen legacies could be dropped: the crazy ring1 hack on > > 32-bit, the various wide interfaces to make pure-software > > virtualization limp along. All major CPUs shipped with hardware > > virtualization support in the past 2-3 years, so the availability of > > VMX and SVM can be taken for granted for such a project. > > That's a pretty bold statement. I have five x86 machines in my house > currently being used, and none of them support VMX/SVM. > > At least some Lenovo laptops disable VMX in the BIOS with no way to > enable it. Some of the Core2Duo chips don't support VMX at all. Ditto some Atom cpus which in turn means you can't run kvm on all the netbooks right now - which is one place its very useful. > I think Xen without paravirtualization would be a serious degradation of > usefulness. At that point you can just use kvm anyway. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/