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 13:23:26 +0000
From:	"Richard W.M. Jones" <rjones@...hat.com>
To:	"Daniel P. Berrange" <berrange@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Pekka Enberg <penberg@...helsinki.fi>,
	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 01:05:13PM +0000, Daniel P. Berrange wrote:
> This is close to the way libguestfs already works. It boots QEMU/KVM pointing
> to a minimal stripped down appliance linux OS image, containing a small agent
> it talks to over some form of vmchannel/serial/virtio-serial device. Thus the
> kernel in the appliance it runs is the only thing that needs to know about the
> filesystem/lvm/dm on-disk formats - libguestfs definitely does not want to be
> duplicating this detailed knowledge of on disk format itself. It is doing
> full read-write access to the guest filesystem in offline mode - one of the
> major use cases is disaster recovery from a unbootable guest OS image.

As Dan said, the 'daemon' part is separate and could be run as a
standard part of a guest install, talking over vmchannel to the host.
The only real issue I can see is adding access control to the daemon
(currently it doesn't need it and doesn't do any).  Doing it this way
you'd be leveraging the ~250,000 lines of existing libguestfs code,
bindings in multiple languages, tools etc.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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