Re: [PATCH] kvm uses smp_call_function_mask() in kvm_flush_remote_tlbs()

[Carsten Otte <cotte-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>]

Avi Kivity wrote:
> A cpu unplug first evicts all tasks from the victim cpu.  During this 
> process, it calls kvm via a hotplug notifier, which notifier calls 
> vcpu_clear() for all vcpus that are resident on that cpu.  So after it 
> runs, there won't be any vcpus on the dead cpu.
> 
> The notifier is called from within stop_machine_run(), which ensures 
> that no task is running on any cpu, so by the time the cpu is being 
> unplugged, any concurrent call to kvm_flush_remote_tlbs() will have ended.
> 
> It's a miracle that it works.
Really interresting. I put it on the "neat code I want to read" list 
for long and dark winter evenings :-).

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