Re: [Xen-devel] libvirt, libxl and QDISKs

[David Scott <dave.scott@xxxxxxxxxxxxx>]

On 26/04/13 05:50, Jim Fehlig wrote:
> Jim Fehlig wrote:
> > Ian Campbell wrote:
> >
> > > On Thu, 2013-04-25 at 14:22 +0100, Dave Scott wrote:
> > >
> > >
> > > > On 25/04/13 13:43, Ian Campbell wrote:
> > >
> > > > It looks like we could define a "qdisk" driverName.
> > > Yes, I think this would work. WRT to your comment below it looks like
> > > other libvirt drivers call this driver "qemu".
> > IMO, we should just extend the above to map driverName 'qemu' to backend
> > 'qdisk'.  But what about the formats?  I though qdisk could handle all
> > of them, particularly with qemu-upstream, even vmdk?
> Something like the attached, which seems to work well for me when
> specifying driverName = qemu, e.g.
>
>      <disk type='file' device='disk'>
>        <driver name='qemu'/>
>        <source file='/var/lib/xen/images/sles11sp2-pv/disk0.raw'/>
>        <target dev='xvda' bus='xen'/>
>      </disk>
This also works for me!

On a related note, what do you think about the attached patch? It allows 
the user to select a non-default qemu via the <emulator> element. My 
domain XML looked like this:
  <devices>
    <emulator>/usr/lib/xen/bin/qemu-system-i386</emulator>
    <disk device="disk" type="network">
      <driver name='qemu'/>
      <source protocol="rbd" name="rbd:rbd/ubuntu1204.img"/>
      <target dev="hda"/>
    </disk>
    <graphics type="vnc" port="-1" autoport="yes" listen="0.0.0.0"/>
  </devices>

Now that upstream qemu is the default in xen-4.3, it seems useful to be 
able to select the traditional qemu for older VMs.
Also I backported this to my xen-4.2 system and used this patch + your 
patch + the previous 'stat()' fix to successfully start a VM on ceph 
storage via libvirt + libxl (my quest is almost complete!)
Cheers,
Dave

Attachment: libxl-make-emulator.patch
Description: Text Data

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