linux-kernel - Re: [RFC] Unify KVM kernel-space and user-space code into a single project

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Date:	Mon, 22 Mar 2010 12:37:26 +0000
From:	"Daniel P. Berrange" <berrange@...hat.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>,
	Antoine Martin <antoine@...afix.co.uk>,
	Olivier Galibert <galibert@...ox.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Sheng Yang <sheng@...ux.intel.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	oerg Roedel <joro@...tes.org>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>, ziteng.huang@...el.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>
Subject: Re: [RFC] Unify KVM kernel-space and user-space code into a single project

On Mon, Mar 22, 2010 at 02:31:49PM +0200, Pekka Enberg wrote:
> On Mon, Mar 22, 2010 at 1:48 PM, Ingo Molnar <mingo@...e.hu> wrote:
> >> What about line number information?  And the source?  Into the kernel with
> >> them as well?
> >
> > Sigh. Please read the _very first_ suggestion i made, which solves all that. I
> > rarely go into discussions without suggesting technical solutions - i'm not
> > interested in flaming, i'm interested in real solutions.
> >
> > Here it is, repeated for the Nth time:
> >
> > Allow a guest to (optionally) integrate its VFS namespace with the host side
> > as well. An example scheme would be:
> >
> >   /guests/Fedora-G1/
> >   /guests/Fedora-G1/proc/
> >   /guests/Fedora-G1/usr/
> >   /guests/Fedora-G1/.../
> >   /guests/OpenSuse-G2/
> >   /guests/OpenSuse-G2/proc/
> >   /guests/OpenSuse-G2/usr/
> >   /guests/OpenSuse-G2/.../
> >
> >  ( This feature would be configurable and would be default-off, to maintain
> >    the current status quo. )
> 
> Heh, funny. That would also solve my number one gripe with
> virtualization these days: how to get files in and out of guests
> without having to install extra packages on the guest side and
> fiddling with mount points on every single guest image I want to play
> with.

FYI, for offline guests, you can use libguestfs[1] to access & change files
inside the guest, and read-only access to running guests files. It provides
access via a interactive shell, APIs in all major languages, and also has a
FUSE mdule to expose it directly in the host VFS.  It could probably be made
to work read-write for running guests too if its agent were installed inside
the guest & leverage the new Virtio-Serial channel for comms (avoiding any
network setup requirements).

Regards,
Daniel

[1] http://libguestfs.org/
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