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Date: Thu, 20 Jan 2011 09:44:05 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 28/35] kvm: x86: Introduce kvmclock device
	to save/restore its state
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To: Anthony Liguori <aliguori@linux.vnet.ibm.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>, Jan Kiszka <jan.kiszka@siemens.com>, Glauber Costa <glommer@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, Markus Armbruster <armbru@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Avi Kivity <avi@redhat.com>

   Hi,

> For (2), you cannot use bus=X,addr=Y because it makes assumptions about
> the PCI topology which may change in newer -M pc's.

Why should the PCI topology for 'pc' ever change?

We'll probably get q35 support some day, but when this lands I expect 
we'll see a new machine type 'q35', so '-m q35' will pick the ich9 
chipset (which will have a different pci topology of course) and '-m pc' 
will pick the existing piix chipset (which will continue to look like it 
looks today).

cheers,
   Gerd