From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1767632AbXEDDjV (ORCPT ); Thu, 3 May 2007 23:39:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1767652AbXEDDjV (ORCPT ); Thu, 3 May 2007 23:39:21 -0400 Received: from ozlabs.org ([203.10.76.45]:50236 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1767632AbXEDDjU (ORCPT ); Thu, 3 May 2007 23:39:20 -0400 Subject: Re: [RELEASE] Lguest for 2.6.21 From: Rusty Russell To: Matt Mackall Cc: lkml - Kernel Mailing List , virtualization In-Reply-To: <20070504032043.GT11115@waste.org> References: <1178117028.19815.14.camel@localhost.localdomain> <20070503160201.GR11166@waste.org> <1178237603.23670.26.camel@localhost.localdomain> <1178239389.23670.33.camel@localhost.localdomain> <20070504032043.GT11115@waste.org> Content-Type: text/plain Date: Fri, 04 May 2007 13:39:06 +1000 Message-Id: <1178249946.23670.40.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.10.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2007-05-03 at 22:20 -0500, Matt Mackall wrote: > I take it both sides of the virtual device drivers are turned on by > the lguest option? Yeah, to quote the code in drivers/lguest/lguest_bus.c: /* At the moment we build all the drivers into the kernel because they're so * simple: 8144 bytes for all three of them as I type this. And as the console * really needs to be built in, it's actually only 3527 bytes for the network * and block drivers. > For the purposes of kernel hacking, I'd want to boot into one build > and repeatedly launch another build as a guest, thereby getting > faster hack/build/test cycles than either qemu or full reboot. > How tightly coupled are things here? I do that all the time, too. The main issue is that we provide no ABI for lguest (at least, not yet), so if you actually change guest/host kernel version, you're on your own... Thanks! Rusty.