On 05.09.2013, at 16:26, Benjamin Herrenschmidt wrote: > On Thu, 2013-09-05 at 16:14 +0200, Andreas Färber wrote: > >> Are you thinking of POWER8 having a different frequency than POWER8 in >> compat mode? Because migration from one -cpu to another is not supported >> elsewhere. >> >> Even if we want to migrate from one POWER7 revision to another, we >> should let the destination use the revision of the source (guest ABI!), >> via property if need be. Anything else will lead to confusion as to what >> is supported and what is not. That -cpu host is the default for >> convenience shouldn't relieve admins/libvirt to think about sensible >> setups like they have to on x86. > > Besides POWER8 uses 512Mhz too :-) It's been architected so it's > unlikely to change from now on.
Ok, ditch the tb frequency then. We can always default to 512Mhz when it's absent. Alex
