On Fri, Jul 10, 2020 at 10:06 AM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > On 10/07/20 18:30, Jim Mattson wrote: > >> > >> This can be problem when having a mixed setup of machines with 5-level page > >> tables and machines with 4-level page tables, as live migration can change > >> MAXPHYADDR while the guest runs, which can theoretically introduce bugs. > > > > Huh? Changing MAXPHYADDR while the guest runs should be illegal. Or > > have I missed some peculiarity of LA57 that makes MAXPHYADDR a dynamic > > CPUID information field? > > Changing _host_ MAXPHYADDR while the guest runs, such as if you migrate > from a host-maxphyaddr==46 to a host-maxphyaddr==52 machine (while > keeping guest-maxphyaddr==46). Ah, but what does that have to do with LA57?
