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Date: Thu, 18 Nov 2010 16:09:34 +0900
From: Isaku Yamahata <yamahata@valinux.co.jp>
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Subject: [Qemu-devel] Re: Hitting 29 NIC limit
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Anjali Kulkarni <anjali@juniper.net>, qemu-devel@nongnu.org

On Thu, Nov 18, 2010 at 08:46:43AM +0200, Michael S. Tsirkin wrote:
> > What is missing for multiple pci buses is
> > - a new PC machine description which has multiple pci buses
> >   My Q35 chipset patch will provide this.
> 
> IMHO, what we really need is a way to specify bridges
> through qdev. Not a machine with a hard-coded buses.

Yes, it's long-term goal.


> The firmware paths used by Gleb's code might supply
> a good syntax to specify topology.
> 
> > - a simple P2P bridge emulator for pc architecture
> > - seabios support
> >   - DSDT for a new machine which has multi pci buses(IRQ routing)
> >   - pv pci bus numbering
> 
> Interesting. What's the motivation for this?

For hot-plugging pci-to-pci bridge. It requires sparse pci bus numbering.
In fact, it's not so strong requirement.
Possibly I would have to dig into dsdt.
-- 
yamahata