Rafael J. Wysocki wrote:
On Sunday 22 March 2009, Jeremy Fitzhardinge wrote:
Rafael J. Wysocki wrote:
Well, why don't you implement the platform suspend operations for Xen?
I guess you don't want ACPI _PTS to be executed during suspend as well.
I don't know. What's _PTS?
It's an ACPI method called to prepare the platform to enter the sleep state
(the name stands for "prepare to sleep"). Executing it may affect the
hardware.
OK, that's what we want. Dom0 is the control domain which is
responsible for the bulk of the hardware; Xen itself has very little
hardware knowledge.
I think you really should not execute any global ACPI methods to suspend a
guest, because that may affect the host. That's why I think it's better to
regard Xen as a platform and implement a separate set of suspend operations for
it.
In this case we're talking about the special privileged domain which can
be considered to be on the "host" side of the line.
That said, I'd be interested in looking at a suspend operations-based
approach if you think its the right way to go. But I'm concerned that
we'd end up with a big set of very similar-looking parallel functions
just to deal with some difference in detail near the bottom. Can you
give me a pointer to where this gets put together for acpi?
Thanks,
J
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