[Bug 1396068] [NEW] [Xen/xl] dom0 needs to run qemu for qcow access

[Stefan Bader]

Public bug reported:

Running a qemu process for dom0 will enable paravirtualized guests (PVM) to use special disk images like qcow2. The problem is that in order to boot those with pygrub, the image has to be temporarily accessed from dom0. But without the qemu process running only raw images can be used.
Openstack by default uses qcow2 images and PVM guests. So trying to use nova on a Xen hosts currently fails to bring up instances (xl via libvirt). This bug is related to bug #1394327 (we also need a bug fix in qemu to make this work).

** Affects: xen (Ubuntu)
     Importance: Medium
     Assignee: Stefan Bader (smb)
         Status: Triaged

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https://bugs.launchpad.net/bugs/1396068

Title:
  [Xen/xl] dom0 needs to run qemu for qcow access

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