Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966211Ab3HHTPa (ORCPT ); Thu, 8 Aug 2013 15:15:30 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40314 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966174Ab3HHTP3 (ORCPT ); Thu, 8 Aug 2013 15:15:29 -0400 Date: Thu, 8 Aug 2013 20:15:22 +0100 From: "Richard W.M. Jones" To: Mike Rapoport Cc: LKML Subject: Re: [QUERY] lguest64 Message-ID: <20130808191522.GA1857@redhat.com> References: <51E97779.3020103@zytor.com> <87zjte9iah.fsf@rustcorp.com.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.20 (2009-12-10) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1636 Lines: 37 On Wed, Jul 31, 2013 at 12:39:23PM +0300, Mike Rapoport wrote: > On Tue, Jul 23, 2013 at 4:28 AM, Rusty Russell wrote: > > Yes, the subset of x86-64 machines for which there isn't hardware > > virtualization support is pretty uninteresting. > > There are plenty virtual machines in EC2, Rackspace, HP and other > clouds that do not have hardware virtualization. I believe that > running a hypervisor on them may be pretty interesting. [Jumping in rather late] The problem with basing this on lguest is that you would need to implement a whole lot of stuff from qemu to make lguest really useful as a modern hypervisor. eg. qcow2 and a variety of other block devices, kvmclock, virtio{-scsi,-net}. Probably more, but just implementing those will keep you going for a while. It might also be feasible to add lguest support to qemu. However I think it's best to do nothing and use TCG mode in qemu. TCG is a bit slower than lguest or UML, but definitely not unusable. It's a drop-in replacement for qemu/KVM with all the same features, and it works today. We use and support TCG to make libguestfs work on EC2. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 100 libraries supported. http://fedoraproject.org/wiki/MinGW -- 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/