Comment 7 for bug 2043987

I was taking a look to nova's source code to determine what would be a good approach to fix this issue, so far what I've found is:

- Nova always add `<acpi />` when the instance is qemu or kvm[0]
- At the moment the <features></features> tree is not being parsed when reading the capabilities supported by the host[1]

So a fix would involve creating a new class named "LibvirtConfigCapsFeatures" that implements a `parse_dom()` method to read, in this first iteration, the acpi node.

[0] https://github.com/openstack/nova/blob/cd5b7e806855fa37461bc2da865435b16408fbd3/nova/virt/libvirt/driver.py#L6203
[1] https://github.com/openstack/nova/blob/cd5b7e806855fa37461bc2da865435b16408fbd3/nova/virt/libvirt/config.py#L120C1-L131C1