Re: [Qemu-devel] [PATCH 0/2 v2] pc: inform SeaBIOS where 64-bit PCI hole begins

[Gerd Hoffmann <kraxel@redhat.com>]

On Mo, 2013-11-04 at 15:35 +0100, Igor Mammedov wrote:
> On Mon, 04 Nov 2013 13:48:03 +0100
> Gerd Hoffmann <kraxel@redhat.com> wrote:
> 
> >   Hi,
> > 
> > > > So maybe design that with memory hotplug in mind?  Such as adding a new
> > > > qemu-specific type QEMU_RAM_HOTPLUG?  Which seabios could use to reserve
> > > > the memory (but not add it to the e820 table for the guest)?
> > > It will do job too. But extending semantics of standard table would be
> > > confusing. Yes, Seabios will filter it out but it doesn't make table
> > > less confusing.
> > 
> > Was just thinking that it might be easier that way if we need e820
> > entries for hotplug memory address space _anyway_.
> I don't think that we need e820 entries for hotplug memory reserved space as
> e820 should. In case present at boot hotpluggable DIMMs would be needed in E820,
> we can add them as usual E820_RAM entries.
> 
> But regardless of what we do here it might be good keep option of adding non
> standard entries in future, by filtering out unknown types in SeaBIOS.
> 
> > 
> > > I'd prefer having a dedicated interface for it as a more clean solution.
> > 
> > Agree.
> 
> So back to naming question, would you agree to renaming fw_cfg to the last
> Michael's suggestion "reserved-memory-end"?

Fine with me.

cheers,
  Gerd