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Re: [Xen-devel] [PATCH] x86/cpuidle: correct Cannon Lake residency MSRs


  • To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 14 Nov 2019 19:28:58 +0000
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  • Cc: Juergen Gross <jgross@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Thu, 14 Nov 2019 19:29:21 +0000
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On 14/11/2019 15:22, Jan Beulich wrote:
> As per SDM rev 071 Cannon Lake has
> - no CC3 residency MSR at 3FC,
> - a CC1 residency MSR ar 660 (like various Atoms),
> - a useless (always zero) CC3 residency MSR at 662.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> ---
> Using the MSR cross reference in the same SDM revision one might even
> get the impression that further MSRs are unavailable, but newer CPUs
> don't appear to be consistently listed there at all, so may rather be a
> doc shortcoming. I've pointed this out to Intel, but I'm not expecting
> swift feedback.

We might consider dropping Cannon Lake.  It did ship 1 limited-release
parts, but only for laptop/tablet SKUs, and there is a reason why it has
been totally discontinued.

There is a very good chance that this is logic which will never be
exercised.

~Andrew

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