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[Thomas Bechtold <tbechtold@xxxxxxxx>]

Public bug reported:

### tested with Juno (latest commit from git) and also with Liberty) ###

Starting a para-virtualized instance on an Xen host where the instance
has a btrfs filesystem leads to:

2015-09-04 14:51:31.325 5359 TRACE nova.compute.manager [instance: f4889cf9-f083
-4c48-b036-655f46c5d819] libvirtError: POST operation failed: xend_post: error f
rom xen daemon: (xend.err "Boot loader didn't return any data!")

The missing thing in the libvirt domain config is the <kernel>
parameter:

<os>
    <kernel>/usr/lib/grub2/x86_64-xen/grub.xen</kernel>
</os>

"/usr/lib/grub2/x86_64-xen/grub.xen" is the correct path on a SUSE
system. I guess on Debian it's "/usr/lib/grub-xen/grub-i386-xen.bin".

The default, /usr/bin/pygrub, doesn't support btrfs .

Steps to reproduce:
1) Create a image: openstack image create --file openSUSE-Leap-42.1-JeOS-for-XEN.x86_64.qcow2 --public --disk-format qcow2 --property hypervisor_type=xen --property vm_mode=xen xen-image
2) boot a VM: nova boot --flavor my-flavor --image xen-image  testvm

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: libvirt

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https://bugs.launchpad.net/bugs/1531197

Title:
  Xen host can't boot a instance with btrfs as filesystem

Status in OpenStack Compute (nova):
  New

Bug description:
  ### tested with Juno (latest commit from git) and also with Liberty)
  ###

  Starting a para-virtualized instance on an Xen host where the instance
  has a btrfs filesystem leads to:

  2015-09-04 14:51:31.325 5359 TRACE nova.compute.manager [instance: f4889cf9-f083
  -4c48-b036-655f46c5d819] libvirtError: POST operation failed: xend_post: error f
  rom xen daemon: (xend.err "Boot loader didn't return any data!")

  The missing thing in the libvirt domain config is the <kernel>
  parameter:

  <os>
      <kernel>/usr/lib/grub2/x86_64-xen/grub.xen</kernel>
  </os>

  "/usr/lib/grub2/x86_64-xen/grub.xen" is the correct path on a SUSE
  system. I guess on Debian it's "/usr/lib/grub-xen/grub-i386-xen.bin".

  The default, /usr/bin/pygrub, doesn't support btrfs .

  Steps to reproduce:
  1) Create a image: openstack image create --file openSUSE-Leap-42.1-JeOS-for-XEN.x86_64.qcow2 --public --disk-format qcow2 --property hypervisor_type=xen --property vm_mode=xen xen-image
  2) boot a VM: nova boot --flavor my-flavor --image xen-image  testvm

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