On 17/06/2016 15:51, Dr. David Alan Gilbert wrote: > >> > Note that the failure mode is pretty brutal since KVM reports an >> > internal error right after restarting on the destination, and who knows >> > what used to happen before the assertion was introduced. All MSRs after >> > MTRRs would be ignored by KVM! > I think we got lucky because the MTRRs were close to the last MSRs > in the list, there was only some MCG/MCE stuff after it which probably > wouldn't have been missed; if the MTRR wasn't set I'm guessing someone > would have just had a behaviour that looked like dreadful performance > after migration perhaps?
No, MTRRs are only used by KVM if there's an assigned device, and that's incompatible with migration. Paolo
