Re: Status of S0ix with Xen

[Simon Gaiser <simon@xxxxxxxxxxxxxxxxxxxxxx>]

A very small correction to Marek's summary, only matters if you really
going to look at details:

Marek Marczykowski-Górecki:
[...]
> 2. When toolstack issues "suspend" command (via xenstore
> control/shutdown), Linux uses "freeze" path, that doesn't put devices
> into low power state. Changing that to "suspend" path helps (the second
> patch in [2]), and for our case seems to have no negative consequences.

That's not quite true. See the hacky change to
xenbus_frontend_dev_resume in that patch. For a proper change this needs
to be clarified when which behavior is actually correct.

> But we do not use live migration nor save/restore - which is another use
> of this feature, and we have not tested if this still works.
> [...]
> [1] 
> https://github.com/QubesOS/qubes-issues/issues/6411#issuecomment-1538089344
> [2] https://github.com/QubesOS/qubes-linux-kernel/pull/910/files
> [3] https://github.com/QubesOS/qubes-vmm-xen-stubdom-linux/pull/63/files

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