I was hoping to have a name that communicate_why_ the memslot needs to be
inhibited, but it's turning out to be really hard to come up with a name that's
descriptive without being ridiculously verbose. The best I've come up with is:
allow_apicv_in_x2apic_without_x2apic_virtualization
It's heinous, but I'm inclined to go with it unless someone has a better idea.