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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Changed in: nova
       Status: In Progress => Opinion

** Changed in: nova
     Assignee: Sean Dague (sdague) => Nikita Gerasimov (nikita-gerasimov)

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https://bugs.launchpad.net/bugs/1655662

Title:
  libvirt xen hvm guests can't  hot plug (attach detach) default block
  devices

Status in OpenStack Compute (nova):
  Opinion

Bug description:
  Currently default disk bus for libvirt+Xen HVM guests is "ide", which
  not allow hot reconfiguration. So images without special metadata
  property specifying bus can't be attached or detached.

  https://github.com/openstack/nova/blob/ad1c7ac2b102112280a25927d731edb168f80998/nova/virt/libvirt/blockinfo.py#L250

  At the same time QEMU/KVM guests have "virtio" as default disk bus for
  disk which is QEMU analog of "xen" bus for XEN.

  Fix looks trivial and require only delete XEN HVM specific part to
  return "xen" as default part in all cases. User will be able to use
  other buses by metadata and only when it's really required.

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