nova/releasenotes/notes/bug-1845986-70730d9f6c09e68b.yaml
Boris Bobrov c2fd8294fd Create a controller for qga when SEV is used
When a guest agent is requested, it requires a virtio-serial controller.
If the controller is not created explicitly, it will be created by
libvirt. But if AMD SEV is also requested, the controller is expected
to use the iommu driver.

In order to achive that, the controller is created explicitly with the
required driver.

Change-Id: I47c248649b9d77e8bd7c5350fc84d89342be4623
Closes-Bug: 1845986
2019-12-10 11:01:08 +00:00

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---
fixes:
- |
`Bug 1845986`_ has been fixed by adding iommu driver when the following
metadata options are used with AMD SEV:
- ``hw_scsi_model=virtio-scsi`` and either ``hw_disk_bus=scsi`` or
``hw_cdrom_bus=scsi``
- ``hw_video_model=virtio``
Also a virtio-serial controller is created when ``hw_qemu_guest_agent=yes``
option is used, together with iommu driver for it.
.. _Bug 1845986: https://launchpad.net/bugs/1845986