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docs: Highlight the current broken state of SEV

This won't be resolved in time for Train GA, so add a release note
highlighting the problem until such a time as the release is fixed.

Change-Id: Iae30e12084640d1c0f072d2db18653111988929e
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>
Related-Bug: #1845986
Stable-Only
tags/20.0.0.0rc2^2
Stephen Finucane 2 months ago
parent
commit
9545edc79d
2 changed files with 31 additions and 0 deletions
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      doc/source/admin/configuration/hypervisor-kvm.rst
  2. +21
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      releasenotes/notes/bug-1845986-95cbede0a296b088.yaml

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doc/source/admin/configuration/hypervisor-kvm.rst View File

@@ -684,6 +684,16 @@ explained above.
Impermanent limitations
-----------------------

The following image metadata options are incompatible with the feature due to
`bug #1845986 <https://bugs.launchpad.net/nova/+bug/1845986>`__.

- ``hw_scsi_model=virtio-scsi`` and either ``hw_disk_bus=scsi`` or
``hw_cdrom_bus=scsi``
- ``hw_video_model=virtio``
- ``hw_qemu_guest_agent=yes``

This limitation will be resolved in the future.

The following limitations may be removed in the future as the
hardware, firmware, and various layers of software receive new
features:

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- 0
releasenotes/notes/bug-1845986-95cbede0a296b088.yaml View File

@@ -0,0 +1,21 @@
---
issues:
- |
The support for guest RAM encryption using AMD SEV (Secure Encrypted
Virtualization) added in Train is incompatible with a number of image
metadata options:

- ``hw_scsi_model=virtio-scsi`` and either ``hw_disk_bus=scsi`` or
``hw_cdrom_bus=scsi``
- ``hw_video_model=virtio``
- ``hw_qemu_guest_agent=yes``

When used together, the guest kernel can malfunction with repeated warnings
like::

NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [system-udevd:272]

This will be resolved in a future patch release. For more information,
refer to `bug 1845986`__

__ https://bugs.launchpad.net/nova/+bug/1845986

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