Il 05/11/2013 10:16, Alexander Graf ha scritto: > > On 05.11.2013, at 10:06, Paolo Bonzini <pbonz...@redhat.com> wrote: > >> Il 30/09/2013 14:57, Alexey Kardashevskiy ha scritto: >>>>> Why is the option under -machine instead of -cpu? >>> Because it is still the same CPU and the guest will still read the real >>> PVR from the hardware (which it may not support but this is why we need >>> compatibility mode). >> >> How do you support migration from a newer to an older CPU then? I think >> the guest should never see anything about the hardware CPU model. > > POWER can't model that. It always leaks the host CPU information into the > guest. It's the guest kernel's responsibility to not expose that change to > user space. > > Yes, it's broken :). I'm not even sure there is any sensible way to do live > migration between different CPU types.
Still in my opinion it should be "-cpu", not "-machine". Even if it's just a "virtual" CPU model. Paolo
