On 17/08/2018 19:48, Eduardo Habkost wrote: > So let's do what's necessary to remove it. But I don't think the > removal of "feature-words" should block the inclusion of this > series. > > Now, should QOM properties follow our feature deprecation policy, > or they were never a supported external API and we can remove it > immediately? > > CCing Jiri and libvir-list, because I just found that there's > code on libvirt that uses it, but I don't know exactly it does > with that info. It is used to check whether the host supports invtsc and pv-unhalt and avoid changing the guest ABI when migrating: see https://marc.info/?l=libvir-list&m=152445761414746&w=2 for a patch that introduces one user. I think we should extend it to MSRs, not remove it.