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Launch of an instance from a bootable volume fails on Xen env.
The root cause of this issue is that Nova is mapping the disk_dev /disk_bus to vda/virtio
instead of xvda/xen. (Below is the session output showing the launch error)

Has this been resolved?  Is anyone working on this issue?

Thanks,
Benjamin

016-03-08 15:07:51.430 3070 INFO nova.virt.block_device [req-b5033c12-196f-411e-8b19-6d15b1e7a5b8 976963ca04df48c79f0c87ff7a330d47 310cb58241964e0a92bc939ec1c6a0ff - - -] [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa] Booting with volume 1d33ba84-9ce2-467d-97c5-973a7ed48456 at /dev/vda
2016-03-08 15:07:55.863 3070 INFO nova.virt.libvirt.driver [req-b5033c12-196f-411e-8b19-6d15b1e7a5b8 976963ca04df48c79f0c87ff7a330d47 310cb58241964e0a92bc939ec1c6a0ff - - -] [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa] Creating image
2016-03-08 15:07:55.864 3070 WARNING nova.virt.libvirt.driver [req-b5033c12-196f-411e-8b19-6d15b1e7a5b8 976963ca04df48c79f0c87ff7a330d47 310cb58241964e0a92bc939ec1c6a0ff - - -] [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa] File injection into a boot from volume instance is not supported
2016-03-08 15:08:01.430 3070 INFO nova.compute.resource_tracker [req-4ac03ab4-f8f6-4141-b96d-2968e9664c35 - - - - -] Auditing locally available compute resources for node compute.openstack.com
2016-03-08 15:08:02.164 3070 ERROR nova.virt.libvirt.driver [req-b5033c12-196f-411e-8b19-6d15b1e7a5b8 976963ca04df48c79f0c87ff7a330d47 310cb58241964e0a92bc939ec1c6a0ff - - -] Error launching a defined domain with XML: <domain type='xen'>
  <name>instance-0000006c</name>
  <uuid>d45a5b7b-314f-4bfa-893d-3498e04f04fa</uuid>
  <metadata>
    <nova:instance xmlns:nova="http://openstack.org/xmlns/libvirt/nova/1.0">
      <nova:package version="2015.1.1-1.el7"/>
      <nova:name>bv-vivid-server</nova:name>
      <nova:creationTime>2016-03-08 23:07:55</nova:creationTime>
      <nova:flavor name="m1.small">
        <nova:memory>2048</nova:memory>
        <nova:disk>20</nova:disk>
        <nova:swap>0</nova:swap>
        <nova:ephemeral>0</nova:ephemeral>
        <nova:vcpus>1</nova:vcpus>
      </nova:flavor>
      <nova:owner>
        <nova:user uuid="976963ca04df48c79f0c87ff7a330d47">admin</nova:user>
        <nova:project uuid="310cb58241964e0a92bc939ec1c6a0ff">admin</nova:project>
      </nova:owner>
    </nova:instance>
  </metadata>
  <memory unit='KiB'>2097152</memory>
  <currentMemory unit='KiB'>2097152</currentMemory>
  <vcpu placement='static'>1</vcpu>
  <os>
    <type arch='x86_64' machine='xenfv'>hvm</type>
    <loader type='rom'>/usr/lib/xen/boot/hvmloader</loader>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <disk type='block' device='disk'>
      <driver name='phy' type='raw' cache='none'/>
      <source dev='/dev/disk/by-path/ip-10.9.85.121:3260-iscsi-iqn.2010-10.org.openstack:volume-1d33ba84-9ce2-467d-97c5-973a7ed48456-lun-0'/>
      <target dev='vda' bus='virtio'/>
      <serial>1d33ba84-9ce2-467d-97c5-973a7ed48456</serial>
    </disk>
    <interface type='bridge'>
      <mac address='fa:16:3e:e1:96:b8'/>
      <source bridge='qbr9fa07fc0-ba'/>
      <target dev='tap9fa07fc0-ba'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0' keymap='en-us'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='cirrus' vram='8192' heads='1'/>
    </video>
    <memballoon model='xen'>
      <stats period='10'/>
    </memballoon>
  </devices>
</domain>

2016-03-08 15:08:02.167 3070 ERROR nova.compute.manager [req-b5033c12-196f-411e-8b19-6d15b1e7a5b8 976963ca04df48c79f0c87ff7a330d47 310cb58241964e0a92bc939ec1c6a0ff - - -] [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa] Instance failed to spawn
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa] Traceback (most recent call last):
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2461, in _build_resources
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     yield resources
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/nova/compute/manager.py", line 2333, in _build_and_run_instance
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     block_device_info=block_device_info)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 2385, in spawn
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     block_device_info=block_device_info)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4403, in _create_domain_and_network
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     power_on=power_on)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4334, in _create_domain
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     LOG.error(err)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 85, in __exit__
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     six.reraise(self.type_, self.value, self.tb)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line 4324, in _create_domain
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     domain.createWithFlags(launch_flags)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 183, in doit
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     result = proxy_call(self._autowrap, f, *args, **kwargs)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 141, in proxy_call
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     rv = execute(f, *args, **kwargs)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 122, in execute
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     six.reraise(c, e, tb)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 80, in tworker
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     rv = meth(*args, **kwargs)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]   File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1059, in createWithFlags
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]     if ret == -1: raise libvirtError ('virDomainCreateWithFlags() failed', dom=self)
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa] libvirtError: internal error: libxenlight failed to create new domain 'instance-0000006c'
2016-03-08 15:08:02.167 3070 TRACE nova.compute.manager [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa]
2016-03-08 15:08:02.170 3070 INFO nova.compute.manager [req-b5033c12-196f-411e-8b19-6d15b1e7a5b8 976963ca04df48c79f0c87ff7a330d47 310cb58241964e0a92bc939ec1c6a0ff - - -] [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa] Terminating instance
2016-03-08 15:08:02.184 3070 INFO nova.virt.libvirt.driver [-] [instance: d45a5b7b-314f-4bfa-893d-3498e04f04fa] Instance destroyed successfully.

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