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Re: [Xen-devel] [PATCH 1/3] x86/ACPI: re-park previously parked CPUs upon resume from S3


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 29 Aug 2019 14:37:42 +0100
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  • Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Julien Grall <julien.grall@xxxxxxx>
  • Delivery-date: Thu, 29 Aug 2019 13:37:57 +0000
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On 14/06/2019 12:37, Jan Beulich wrote:
> Aiui when resuming from S3, CPUs come back out of RESET/INIT.

From a programmers point of view, all APs are in Wait-for-SIPI after
resume, and this is confirmed by several of the BWG flowcharts.  This is
a logical consequence of the CPU losing all power, meaning that its
startup sequence will be the same whether it is booting from S5 or S3.

>  Therefore
> they need to undergo the same procedure as was added elsewhere by
> commits d8f974f1a6 ("x86: command line option to avoid use of secondary
> hyper-threads") and 8797d20a6e ("x86: possibly bring up all CPUs even
> if not all are supposed to be used").
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

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

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