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

Get a specific error message, like the one on x86_64, when using a migration xml that has some wrong data.

Please provide the package NVR for which bug is seen:

libvirt-9.5.0-5.el9.s390x

How reproducible:

100%

Steps to reproduce

1. Start a VM with an rng device, e.g.

   <rng model='virtio'>
         <backend model='builtin'/>
         <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0009'/>
       </rng>

1. Migrate the machine, e.g.

   virsh migrate --live --verbose --domain avocado-vt-vm1 --desturi qemu+ssh://10.0.160.6/system --xml /var/tmp/tmp7m3t9yv_

   where the rng device has a different device address, e.g.

   <address type="ccw" cssid="0xfe" ssid="0x0" devno="0x9999" />

Expected results

There's an error message, indicating the target address is not matching the source, e.g. on x86_64 for a pci address we'd get

error: unsupported configuration: Target device PCI address 0000:00:09.01 does not match source 0000:00:09.00

Given the actual output, maybe the

Actual results

Migration: [100.00 %]error: internal error: QEMU unexpectedly closed the monitor (vm='avocado-vt-vm1'): 2023-11-02T08:36:02.208575Z qemu-kvm: Unknown savevm section or instance '/fe.0.0009/virtio-rng' 0. Make sure that your current VM setup matches your saved VM setup, including any hotplugged devices
2023-11-02T08:36:02.208674Z qemu-kvm: load of migration failed: Invalid argument