RE: [Xen-devel] Re: [patch 0/3]Enable CMCI (Corrected Machine Check Error Interrupt) for Intel CPUs

["Ke, Liping" <liping.ke@xxxxxxxxx>]

> 
> One thing -- if you want to reduce the window between release of a
> band by its old owner and acquisition by a new owner, we could do the
> whole lot before stop_machine_run()? Maybe cmci_cpu_down(cpu) which
> would IPI 'cpu' to clear its CMCI state and then IPI all other CPUs
> to pick up the released banks. This would be neatly hooked off
> CPU_DOWN_PREPARE or similar in Linux, but Xen doesn't have cpu
> notifiers. :-) You'd have to call cmci_cpu_down() explicitly in
> cpu_down(). Or perhaps we should have cpu notifier chains in Xen
> too... 
Hi, Keir
When we wrote the patch, yunhong also mentioned similar thoughts, 
I will have some discussion with him tomorrow.
Thanks a lot!
Criping
> 
> If we do the above I don't think we need to re-introduce your rollback
> logic. If you think about it, there's no reason to prefer the old
> owner over the new owner, so no reason to roll back. I believe?
> 
>  -- Keir
> 
> 
> 
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