[Qemu-devel] Re: [RESEND PATCH] acpi_piix4: save gpe and pci hotplug slot status

[Alex Williamson <alex.williamson@redhat.com>]

On Wed, 2010-06-16 at 17:47 +0200, Juan Quintela wrote:
> Anthony Liguori <anthony@codemonkey.ws> wrote:
> > On 06/14/2010 03:28 PM, Alex Williamson wrote:
> >> PCI hotplug currently doesn't work after a migration because
> >> we don't migrate the enable bits of the GPE state.  Pull hotplug
> >> structs into vmstate.
> >>
> >> Signed-off-by: Alex Williamson<alex.williamson@redhat.com>
> >>    
> >
> > Applied.  Thanks.
> >
> > Regards,
> >
> > Anthony Liguori
> 
> I think this is better implemented as a subsection.  We didin't need
> this until hotplug arrived, I think that checking if any up/down are
> != 0 and then send it as subsections is a best way to do it.
> 
> This way it could also be backported to stable.

The slots aren't really the issue, they were mostly for completeness.
The key is gpe.en, which is likely always going to be all 1s for an ACPI
aware OS.  So if we test != 0, we're going to need that subsection in
99% of the cases.  Maybe we can assume gpe.en is all set on the target,
but I don't really look forward to finding out the ways that might
break.  Thanks,

Alex