What were you trying to do that didn't work?

Migrate a VM with ignored feature <acpi/> from a RHEL 9.0 or a RHEL 9.2 host to a RHEL 9.4 host.

Please provide the package NVR for which bug is seen:

Source 1
qemu-kvm-6.2.0-11.el9_0.9.s390x
libvirt-8.0.0-8.6.el9_0.s390x

Source 2
qemu-kvm-7.2.0-14.el9_2.s390x
libvirt-9.0.0-10.el9_2.s390x

Destination
Warning: Permanently added '10.0.160.36' (ED25519) to the list of known hosts.
qemu-kvm-8.2.0-11.el9_4.5.s390x
libvirt-10.0.0-6.6.el9_4.s390x

How reproducible:

100%

Steps to reproduce

1. Define and start a VM with

   <features><acpi/></features>

2. Migrate the VM to a RHEL 9.4 host

Expected results

The migration succeeds.

Actual results

The migration fails.

error: unsupported configuration: machine type 's390-ccw-virtio-rhel9.0.0' does not support ACPI

Additional information

This was called out by bfiuczyn.

The problem is that on the Source host the incorrect configuration is just ignored but it's not ignored on the destination host. Libvirt allows to modify the XML during migration by passing

--xml

. However, this specific example doesn't allow this because the ABI stability check would fail.

I'm not sure if there could be a workaround so setting Major at this point even if it's based on a wrong configuration. People new to s390x might inadvertently add unsupported elements to the domain xml that are ignored leading to this scenario.