Re: RCU treating guest mode just like it does user-mode execution

[Avi Kivity]

On 08/17/2011 05:25 PM, Paul E. McKenney wrote:
> >  >
> >  Wouldn't scheduling-clock interrupt kick vcpu out of a guest mode much
> >  earlier then 30 seconds?
>
> The scheduling-clock interrupt would happen, but I do not know whether
> or not it would kick the vcpu out of guest mode in such a way that
> would result in RCU thinking that the CPU has passed through a quiescent
> state.

The result can only be one of

  reenter guest (and rcu_virt_note_context_switch)
  schedule()
  exit to userspace

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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