On 06/17/2013 07:17:30 PM, Benjamin Herrenschmidt wrote:
On Mon, 2013-06-17 at 19:01 -0500, Scott Wood wrote:
> I really doubt the exception scratch registers need to be saved --
> we're not trying to restore into the middle of an exception
> prolog/epilog.
>
> book3s has the PACA as well and they don't save it. Don't we rely
on
> things like boot-time memory allocations happening in the same place
> when we resume? extlb is part of the PACA, so the same applies.
I doubt we seriously tested hibernation :-) The PACA SPR should
definitely be saved/restored.
OK. It's not obvious to me how much the entire mechanism depends on
things like boot time allocations being the same each time -- if we do
depend on that in general, then the PACA shouldn't change on a
particular CPU, right?
Is it possible to restore on a different CPU than we saved on? If so,
could restoring the PACA leave us pointing to a different CPU's PACA?
-Scott
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