When booting Instance the hw_video_head property isn't retrieved from the image metadata

[Omri Hochman]

When booting Instance the hw_video_head property isn't retrieved from the image metadata :

This functionality of modifying the number of heads for spice users should have been added in Ice-House
according to BP :
https://blueprints.launchpad.net/nova/+spec/libvirt-video-driver-selection

I've tested the other video properties (hw_video_model , hw_video_ram ) and they seems to work fine ,
the only problem is with: 'hw_video_head' .

Steps:
-----------

- nova flavor-key m1.small set hw_video:ram_max_mb=128

- glance image-update rhel64 --property hw_video_model=qxl
- glance image-update rhel64 --property hw_video_ram=64
- glance image-update rhel64 --property hw_video_head=2

+----------------------------+--------------------------------------+
| Property | Value |
+----------------------------+--------------------------------------+
| Property 'hw_video_head' | 2 |
| Property 'hw_video_model' | qxl |
| Property 'hw_video_ram' | 64 |

- boot instance from that image ^^

Look at :
---------------
/var/lib/nova/instances/<Instace ID>/libvirt.xml

<video>
      <model type="qxl" vram="64"/>
    </video>
  </devices>
</domain>

Results:
------------
- the hw_video_head property isn't retrieved from the image metadata
- there's no mention of it in the libvirt.xml

[Vladan Popovic (vpopovic)]

There's no patch that retrieves the hw_video_head property in the libvirt driver, but there is a patch that sets up the libvirt config in nova [1]. This somehow slipped in the review process i guess.

[1] https://review.openstack.org/#/c/58613/6/nova/virt/libvirt/config.py

[Vladan Popovic (vpopovic)]

Can't choose Won't Fix, so I set it to Invalid status.
The reason is described in this patch - https://review.openstack.org/#/c/87300/