Re: S0ix support in Xen

[Simon Gaiser <simon@xxxxxxxxxxxxxxxxxxxxxx>]

Simon Gaiser:
[...]
> On my test system (NUC11TNHi5, Tiger Lake) I haven't seen it reaching
> cstates lower PC7 with Xen (so it can of course not reach S0ix
> residency). With plain Linux I got it working on that system although it
> was rather fiddly and probably something is fishy on the firmware side.
> After seeing it very occasionally not working under plain Linux I have
> installed a newer firmware version. With that Xen currently doesn't wake
> up after triggering s2idle in dom0. I'm currently looking into that and
> will follow up if I have more details on that part.

Solved the wakeup issue, see
https://lore.kernel.org/xen-devel/20230313134102.3157-1-simon@xxxxxxxxxxxxxxxxxxxxxx/
(doesn't change the cstate it reaches)

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