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Re: [Xen-devel] [PATCH] x86/cpuidle: correct Cannon Lake residency MSRs
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 15 Nov 2019 12:35:52 +0000
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- Cc: Juergen Gross <jgross@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 15 Nov 2019 12:36:11 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 15/11/2019 09:37, Jan Beulich wrote:
> 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?
Just dropping the case labels. No point going out of the way to
prohibit booting as, even with these dropped, the result would be
generally usable.
> 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".
Its not really a secret. It was an experiment with a 10nm lithography
process which didn't pan out. It has been formally discontinued.
~Andrew
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