Re: [PATCH RFC] acpi: add ssdt for cpi hotplug

["Michael S. Tsirkin" <mst@redhat.com>]

On Wed, Nov 02, 2011 at 08:30:28PM -0400, Kevin O'Connor wrote:
> On Wed, Nov 02, 2011 at 10:54:42AM +0200, Michael S. Tsirkin wrote:
> > On Tue, Nov 01, 2011 at 06:59:01PM -0400, Kevin O'Connor wrote:
> > > Can we leave these parts in the DSDT and only move the bulk generated
> > > stuff to the SSDT?
> > > 
> > They can, but I thought one of the reasons we do the split
> > is to make it possible for users to supply their own DSDT?
> > If so creating calls from SSDT into DSDT would make this very fragile.
> 
> I think it's reasonable to require that a user supplied DSDT still
> fill certain requirements.  Keep in mind that the reason for the "user
> supplied" DSDT was for new platform (q35) development - not
> necessarily so each individual user could set their own.
> 
> It's not great to have the DSDT and SSDT tied to each other.  However,
> once RMV is removed, it's only two methods (PCNT supplied by the SSDT
> and PCEJ supplied by the DSDT).
> 
> I do see the upside to moving it all to the SSDT - but that has the
> disadvantage of taking away the ability of a user supplied DSDT to
> tweak how the hotplug functions work.

Is this something q35 needs?

>  Also, we'd then want to redo CPU hotplug to be the same way.

OK, I'll do that if we decide this is a good direcction.

> -Kevin