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From: Paul Brook <paul@codesourcery.com>
Date: Wed, 16 Jun 2010 12:45:27 +0100
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Subject: [Qemu-devel] Re: RFC qdev path semantics
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To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: chrisw@redhat.com, kvm@vger.kernel.org, Markus Armbruster <armbru@redhat.com>, qemu-devel@nongnu.org, Alex Williamson <alex.williamson@redhat.com>, kraxel@redhat.com, avi@redhat.com

> Markus Armbruster wrote:
> > A number of changes to qdev paths have been proposed in various threads.
> > It's becoming harder to keep track of them, so let me sum them up in one
> > place.  Please correct me if I misrepresent your ideas.
> > 
> > I'm going to describe the current state of things, and the proposed
> > changes (marked with ###).
> > 
> > 
> > The device tree has the main system bus as root.  A child of a bus is a
> > device.  A child of a device is a bus.
> > 
> > A qdev path consists of qdev path components separated by '/'.  It
> > resolves to a node in the device tree, either bus or device.
> > 
> > The qdev path "/" resolves to the root, i.e. the main system bus.
> 
> Another aspect: A path may start with an arbitrary bus name, not only
> the system bus. Although this is ambiguous, we need to keep it for
> addressing the bus itself due to existing client use. But, IMO, we
> should at least start deprecating this for addressing elements below
> that bus (e.g. "pci.0/e1000").

I think this would be better served by adding explicit aliases/IDs for those 
use-cases. i.e. define the global ID "pci.0" to be an alias for
 /i440FX-pcihost/pci

Paul