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

[Machines] There is no "Changes pending" after changing the cpu type to "host-model" on aarch64

Please provide the package NVR for which bug is seen:

cockpit-machines-308-1.el9.noarch

cockpit-311.1-1.el9.aarch64

libvirt-dbus-1.4.1-5.el9.aarch64

How reproducible:

100%

Steps to reproduce

1. Prepare a physical ARM env 

2. Import a running vm like cirros, enter vm details page

3. Click "Edit"  after CPU, change Mode to "host-model"

There will be no "Changes pending" or hint showing "Changes will take effect after shutting down the VM"

4. Shutdown the vm, the mode is changed to host-model correctly, but if run the vm , will get an error:

unsupported configuration: CPU mode 'host-model' for aarch64 kvm domain on aarch64 host is not supported by hypervisor

Expected results

There should be  "Changes pending" or an error showing can not change to host-model for aarch64

Actual results

See step 3.