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Re: S0ix support in Xen
- To: Simon Gaiser <simon@xxxxxxxxxxxxxxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Wed, 29 Mar 2023 16:38:01 +0200
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 29 Mar 2023 14:38:25 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Mon, Feb 27, 2023 at 12:48:03PM +0100, Simon Gaiser wrote:
> Hi,
>
> I have been looking into using S0ix with Xen. On systems with with 11th
> gen (Tiger Lake) Intel mobile CPUs or newer this is often the only
> supported suspend method, thus we want to support it in Qubes OS.
>
> Below a summary of my current understanding of what's needed (and known
> unknowns). I would appreciate some feedback (what's missing, preferred
> solutions, etc.).
>
> Note this topic is much above my previous experience with Xen and x86
> power management internals, so sorry if I'm missing things that are
> obvious to you.
>
> PIT timer: During some previous private discussion it was mentioned that
> the PIT timer that Xen initializes for IO-APIC testing prevents S0ix
> residency and therefore that part needs to be reworked. But if I'm
> reading the current code correctly Xen can already use the HPET timer
> instead, either with an automatic fallback if PIT is unavailable or by
> forcing it via hpet=legacy-replacement=1. Looking at the rest I think
> the PIT isn't used if Xen finds another clocksource. Did I miss
> something?
Do you have some reference to documentation related to the S0ix
states?
I would like to understand exactly what's required in terms of
hardware devices the OS can use and still be able to enter such
states.
Thanks, Roger.
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