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. Cheers, Ben. > Andreas > > > > > But yes, without frequency adjustment I see where you're coming from. We > > still only need the timebase the guest sees, not the offset. But we also > > need the host wall clock to allow for adjustments :). > > > > > > Alex > > > >