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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Mon, 23 Oct 2017 07:45:57 +0200
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Subject: Re: [Qemu-devel] [PATCH] hw/pci-host: Fix x86 Host Bridges 64bit
 PCI hole
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To: Marcel Apfelbaum <marcel@redhat.com>, Laszlo Ersek <lersek@redhat.com>, qemu-devel@nongnu.org
Cc: mst@redhat.com, pbonzini@redhat.com, ehabkost@redhat.com, Igor Mammedov <imammedo@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>

  Hi,

> The guest will still run with 40 bits physical!
> (judging the code anyway, I hope I am wrong)
> 
> Then, the stakes are not so big, the Guest kernel will disregard
> the 64bit hole since is not CPU addressable and go on.

But then there is no working 64bit hole for hotplug ...

cheers,
  Gerd