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Re: [Xen-devel] [PATCH v2 1/3] x86/idle: re-arrange dead-idle handling


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Mon, 20 May 2019 15:25:49 +0100
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  • Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Mon, 20 May 2019 14:25:57 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 17/05/2019 11:11, Jan Beulich wrote:
> In order to be able to wake parked CPUs from default_dead_idle() (for
> them to then enter a different dead-idle routine), the function should
> not itself loop. Move the loop into play_dead(), and use play_dead() as
> well on the AP boot error path.
>
> Furthermore, not the least considering the comment in play_dead(),
> make sure NMI raised (for now this would be a bug elsewhere, but that's
> about to change) against a parked or fully offline CPU won't invoke the
> actual, full-blown NMI handler.
>
> Note however that this doesn't make #MC any safer for fully offline
> CPUs.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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