Re: [PULL 06/35] hw/acpi: refactor acpi hp modules so that targets can just use what they need

[Peter Maydell]

On Wed, 20 Jul 2022 at 19:37, Ani Sinha <ani@anisinha.ca> wrote:
>
>
>
> On Tue, 19 Jul 2022, Peter Maydell wrote:
>
> > On Sat, 4 Sept 2021 at 22:36, Michael S. Tsirkin <mst@redhat.com> wrote:
> > How is this intended to work? The obvious fix from my point
> > of view would just be to say "piix4.c requires pcihp.c"
> > and cause CONFIG_ACPI_PIIX4 to pull in CONFIG_ACPI_PCIHP,
> > but that seems like it would be rather undoing the point
> > of this change.
>
> Yes. From the commit log and the vague recollection I have about this
> change :
>
> > For example, mips only needs support for PIIX4 and does not
> > need acpi pci hotplug support or cpu hotplug support or memory hotplug
> support
> > etc
>
> So does malta really need acpi hotplug? If not, then the stubbing out of
> the vmstate struct is correct.

It's not, because the vmstate struct is actually used when you
savevm/loadvm a malta machine. If the malta shouldn't have
acpi hotplug then we need to arrange for the hotplug code
to be avoided at an earlier point, not just stub in the
vmstate struct field.

-- PMM