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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => liberty-3

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https://bugs.launchpad.net/bugs/1462295

Title:
  xenapi needs pre live-migration plugin to check/fake pv driver version
  in xenstore

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Xenserver relies on guest (domU) to provide information about
  the presence of PV drivers in the guest image back to dom0 though
  xenstore for various actions like live-migration etc.

  It is possible for users to disable the xen agent that reports this
  info and therefore causing failures in live-migration.
  In cases where
  PV drivers are running it is safe to fake the presence of this information
  in xenstore. XAPI simply reads this information to ascertain the presence
  of pv drives.

  Since it is common for users to disable this, we need a way to ensure that if
  pv tools are present (we can check this though the presence of pv devices like  vif)
  we can carry out a live-migration. We can easily do this by faking driver version in xenstore
  for the instance for which we are attempting live-migration prior to starting live-migration.

  In cases where this info is not present in xenstore, xapi will simply fail the migration attempt with
  VM_MISSING_PV_DRIVERS error.

  2014-04-24 20:47:36.938 24870 TRACE nova.virt.xenapi.vmops Failure:
  ['VM_MISSING_PV_DRIVERS', 'OpaqueRef:ef49f129-691d-
  4e18-7a09-8dae8928aa7a']

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