Re: [SeaBIOS] [PATCH] qemu: piix: PCI bridge ACPI hotplug support

[Gerd Hoffmann]

Hi,
> Yes and not just because of windows guests.
> ACPI spec is also very explicit that native hotplug is an optional
> feature. Test suites such as WHQL are known to test spec compliance.

/me looks a bit surprised.

This pretty much implies that any shpc bridge needs a second interface
to the hotplug functionality which can be driven via ACPI.  Or the
firmware somehow handles this using smm (not sure this works for the IRQ
though).

Do you know how this is handled by real hardware?

cheers,
  Gerd