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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 10 Oct 2013 14:42:07 +0200
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Subject: Re: [Qemu-devel] [RFC] map 64-bit PCI devices after all possible RAM
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>, kevin@koconnor.net, seabios@seabios.org, qemu-devel@nongnu.org, pbonzini@redhat.com

  Hi,

> > > I think the issue is with legacy guests.
> > > E.g. if VCPU claims to support 50 bit of memory
> > > do we put high PCI memory at 1 << 50?
> > > If yes old guests which expect at most 40 bit
> > > will not be able to use it.
> > 
> > Hmm.  Sure such guests exist?
> 
> I wouldn't be surprised. At least some windows
> guests crash if you try to tell them your system
> has too much physical memory (e.g. 2^48).

Ok, so there is not really a way around making the location
configurable.  The size isn't needed, qemu can handle this on it's own.

Guess we can just go with Igor's approach then.  "etc/mem64-end" is a
pretty bad name to say "please map 64bit pci bars here" though.

cheers,
  Gerd