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Date: Thu, 18 Nov 2010 12:54:29 +0100
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] Re: Hitting 29 NIC limit
References: <20101116172141.GA4077@redhat.com>	<C9081994.3517C%anjali@juniper.net>	<20101117105843.GB10168@redhat.com>
	<20101118030918.GA18102@valinux.co.jp>
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To: Isaku Yamahata <yamahata@valinux.co.jp>
Cc: Anjali Kulkarni <anjali@juniper.net>, qemu-devel@nongnu.org, "Michael S. Tsirkin" <mst@redhat.com>

   Hi,

> What is missing for multiple pci buses is

> - a simple P2P bridge emulator for pc architecture
> - seabios support
>    - DSDT for a new machine which has multi pci buses(IRQ routing)

Is this really needed?

IIRC there are (used to be?) multiport nic pci cards which are simply 
multiple ethernet card pci chips behind a pci-to-pci bridge.  Such a 
pci-to-pci bridge should be able to operate without bios support, no?

So one cold just do ...

   -device pci-bridge,id=br
   -device e1000,bus=br.0
   -device e1000,bus=br.0

to create a bridge with two nics behind it?

cheers,
   Gerd