[libvirt-users] <vcpu placement='static' current='N'>M</vcpu>

Hello. I seem to be to stupid to configure vcpu hotplugging on one of my machines. Whenever i set: <vcpu placement='static' current='4'>4</vcpu> and save this setting, this setting is undone by libvirt. It jumps back to: <vcpu placement='static'>4</vcpu> I'm confused now. Someone has an idea what's going on here? Any hints are really appreciated. cheers t.