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Re: [Qemu-devel] [RFC] QEMU Dbus support - a proposal management API

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [RFC] QEMU Dbus support - a proposal management API
Date: Tue, 11 Dec 2007 15:24:41 +0000
User-agent: Mutt/1.4.1i

On Tue, Dec 11, 2007 at 04:17:51PM +0100, Jean-Christian de Rivaz wrote:
> Anthony Liguori a écrit :
>  > The main objection I have to dbus is that it's very heavy weight.  It
> >implies a rather fat infrastructure and it not very suitable for 
> >embedding.  QEMU has very few dependencies and that is a strength ATM.  
> >People interested in embedding QEMU still want a good management 
> >interface so enhancing the monitor seems more preferable to me than 
> >adding a dbus dependency.
> I must object again that.
> I use D-Bus on a very small processor (Analog Devices Blackfin BF-537) 
> and it work very well. The library is around 200k on the target: this is 
> very supportable for embedded device, especially when you take in 
> account all the simplifications it allow in the code of each 
> applications. The D-Bus library have very few and simple dependency.
> D-Bus is a growing standard for the communication between applications. 
> I expect that sooner or later, QEMU will be a D-Bus service.

A DBus service for controlling QEMU, does not imply that QEMU needs to use
DBus. It is perfectly possible to write DBus services for managing QEMU
outside of the QEMU process. I've written 2 myself - the first exposed a
DBus service for managing a collection of VMs, and communicated with QEMU
via its monitor. The second, simply exposed the libvirt API over DBus
which allows managing of QEMU, Xen, KVM, etc via the same interface.

Embedding DBus within QEMU is flawed because it neccessarily restricts you
to only managing a single VM, and does not provide you any management 
capabilities when QEMU is not running.

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