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

[Jan Beulich <jbeulich@xxxxxxxx>]

On 14.11.2019 20:28, Andrew Cooper wrote:
> 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.

How would you envision "dropping" to look like: Do you mean just to
remove the case label here (and perhaps similar ones elsewhere), or
outright refuse booting on it?

In both cases if I were to submit such a change I'm afraid I'd want
to be a little less vague in the description than to just say "there
is a reason why it has been totally discontinued".

Jan

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