[libvirt] [PATCH] Default to qemu:///system if accessible

[Daniel P. Berrange]

On Mon, Sep 06, 2010 at 10:17:17AM +0100, Daniel P. Berrange wrote:
> Our goal is to improve qemu://session's networking such that this isn't
> a reason to use qemu://system anymore.

BTW, some ideas we have for attacking this problem are

 - Add support to network manager to create TAP devices on behalf
   of the logged in user. Thus libvirt would talk to NM over dbus
   and ask it to create a TAP device, which we then pass to QEMU
   in the normal manner. Thus neither libvirtd or QEMU need higher
   privileges. This also requires NM to understand bridging setup.

 - Integrate with VDE as the solution for the 'virtual network'
   functionality in libvirt. This improves on 'user' networking
   mode by allowing VMs to talk to each other, out of the box
   they still have slirp based access to the outside world. It
   is possible to make VDE use a TAP device for connectivity
   to the outside world, so either the admin can set one up,
   or again we can ask network manager todo it, which in this
   case doesn't require full bridging support - just NAT which
   NM can already do via its 'connection sharing' feature.

 - A setuid helper program that libvirtd can use for setting up
   TAP devices. This is just a crappier version of getting network
   manager todo it for us.

Daniel
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