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Date: Thu, 15 Dec 2011 14:00:11 +0800
From: Hui Kai Ran <hkran@linux.vnet.ibm.com>
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Subject: [Qemu-devel] multifunction  pci virtio-blk devices
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To: qemu-devel <qemu-devel@nongnu.org>

Hi,

It seems that qemu now have the ability to install pci device with 
mutlifunction=on, such as
I got a cfg file to start qemu

[device "ehci"]
   driver = "ich9-usb-ehci1"
   addr = "0d.7"
   multifunction = "on"

[device "ehci1"]
   driver = "ich9-usb-ehci1"
   addr = "0d.3"
   multifunction = "on"

[device "ehci2"]
   driver = "ich9-usb-ehci1"
   addr = "0d.4"
   multifunction = "on"

[device "ehci3"]
   driver = "ich9-usb-ehci1"
   addr = "0d.5"
   multifunction = "on"

I end up with four usb controllers in one slot.

but for virtio blk device , how can i open multifunction ability?

Thanks.