Re: [Xen-devel] [PATCH 3/3] mwait-idle: add enablement for AMD Naples and Rome

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 25.02.19 at 21:24, <Brian.Woods@xxxxxxx> wrote:
> Add the needed data structures for enabling Naples (F17h M01h).  Since
> Rome (F17h M31h) has the same c-state latencies and entry methods, the
> c-state information can be used for Rome as well.  For both Naples and
> Rome, mwait is used for c1 (cc1) and halt is functionally the same as
> c2 (cc6).  If c2 (cc6) is disabled in BIOS, then halt functions similar
> to c1 (cc1).

But your code does not detect this situation, and does hence not update
the table used accordingly. Why is this? Is entering C1 cheaper one way
or the other in this situation (in which case the cheaper approach should
always be used)?

Jan



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