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). Paolo
