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[melanie witt <1876301@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova/ussuri
   Importance: Undecided
       Status: New

** Also affects: nova/stein
   Importance: Undecided
       Status: New

** Also affects: nova/train
   Importance: Undecided
       Status: New

** Changed in: nova/stein
   Importance: Undecided => Medium

** Changed in: nova/ussuri
   Importance: Undecided => Medium

** Changed in: nova/train
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1876301

Title:
  block_device_mapping_v2.disk_bus allows invalid values

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) stein series:
  New
Status in OpenStack Compute (nova) train series:
  New
Status in OpenStack Compute (nova) ussuri series:
  New

Bug description:
  Description
  ===========

  There is no validation of the provided disk_bus in the API, with
  libvirt this eventually leads to the driver and hypervisor eventually
  ignoring the requested disk_bus and defaulting to virtio.

  Steps to reproduce
  ==================

  A common mistake for users to make is to request a virtio-scsi
  disk_bus:

  $ nova boot --flavor 2 --block-device id=a37d4630-fbc0-4b8e-
  91a0-18346f907830,source=image,dest=volume,size=1,bus=virtio-
  scsi,bootindex=0 --nic net-name=private test

  Expected result
  ===============

  This should be rejected as this is not a supported disk_bus, instead
  scsi should be used.

  Actual result
  =============

  The value is ignored and the instance defaults to a virtio bus.

  Environment
  ===========
  1. Exact version of OpenStack you are running. See the following
    list for all releases: http://docs.openstack.org/releases/

     master

  2. Which hypervisor did you use?
     (For example: Libvirt + KVM, Libvirt + XEN, Hyper-V, PowerKVM, ...)
     What's the version of that?

     Libvirt + KVM

  2. Which storage type did you use?
     (For example: Ceph, LVM, GPFS, ...)
     What's the version of that?

     N/A

  3. Which networking type did you use?
     (For example: nova-network, Neutron with OpenVSwitch, ...)

     N/A

  Logs & Configs
  ==============

  $ nova boot --flavor 2 --block-device id=a37d4630-fbc0-4b8e-91a0-18346f907830,source=image,dest=volume,size=1,bus=virtio-scsi,bootindex=0 --nic net-name=private test
  [..]
  $ sudo virsh domblklist 45bee4d4-1092-4829-9d98-d32337eb6caf
   Target   Source
  -----------------------------------------------------------------------------------------------------------------
   vda      /opt/stack/data/nova/mnt/896fb15da6036b68a917322e72ebfe57/volume-f866cbb6-b793-4c89-a7e2-b3e0c6f4c2e7

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