------- Comment From [email protected] 2020-09-15 09:55 EDT-------
Upgraded on an SE capable LPAR an Ubuntu Focal to Groovy.
Successfully checked installed libvirt packages if they are at least match with 
the above description.

# apt list --installed | grep libvirt

WARNING: apt does not have a stable CLI interface. Use with caution in
scripts.

gir1.2-libvirt-glib-1.0/groovy,now 3.0.0-1 s390x [installed,automatic]
libvirt-clients/groovy,now 6.6.0-1ubuntu2 s390x [installed]
libvirt-daemon-driver-qemu/groovy,now 6.6.0-1ubuntu2 s390x [installed,automatic]
libvirt-daemon-system-systemd/groovy,now 6.6.0-1ubuntu2 s390x 
[installed,automatic]
libvirt-daemon-system/groovy,now 6.6.0-1ubuntu2 s390x [installed,automatic]
libvirt-daemon/groovy,now 6.6.0-1ubuntu2 s390x [installed]
libvirt-dev/groovy,now 6.6.0-1ubuntu2 s390x [installed]
libvirt-glib-1.0-0/groovy,now 3.0.0-1 s390x [installed,automatic]
libvirt0/groovy,now 6.6.0-1ubuntu2 s390x [installed,automatic]
python3-libvirt/groovy,now 6.1.0-1 s390x [installed,automatic]

Protected virtualization was enabled on the system before and after upgrade.
Libvirts cached capabilities file was up to date, virt-host-validate returned 
"pass" for "QEMU: Checking for secure guest support" and SE guest was able to 
start successfully.

Removed "prot-virt=1" kernel parameter and rebooted host.
Libvirts cached capabilities file had been updated, virt-host-validate returned 
"WARN (IBM Secure Execution appears to be disabled in kernel. Add prot_virt=1 
to kernel cmdline arguments)" for "QEMU: Checking for secure guest support" and 
as expected SE guest was NOT able to start.

Added "prot_virt=1" kernel parameter and rebooted host.
Libvirts cached capabilities file has been update, virt-host-validate returned 
"pass" for "QEMU: Checking for secure guest support" and SE guest was able to 
start successfully.

Played around with kernel parameter values (prot_virt or prot-virt setting it 
to 0 or 1) a couple of times.
All seems to work as expected.

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https://bugs.launchpad.net/bugs/1874647

Title:
  [Ubuntu 20.04] Stale libvirt cache leads to VM startup failures

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