On 10/09/2018 11:13, Jan Beulich wrote: > >> Equally, it may still be able to service #MC's, so I can't see how it is >> safe for us to ever free the percpu data. > I'm having trouble seeing how this remark relates to the series here.
Because you've tried to make NMIs safe, but not made equivalent adjustments to the #MC side of things. > Plus it's a theoretical problem at present only anyway: > - physical hot remove is not implemented (there's no source of the > new CPU_REMOVE notification), > - Intel CPUs get parked, i.e. never have their per-CPU data freed, > - AMD CPUs don't broadcast #MC. Ignoring MCE's is never an option, but whenever CR4.MCE is set, we must be prepared to handle #MC. Just because an AMD CPU is playing dead doesn't mean it is immune to receiving #MC's. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
