From mboxrd@z Thu Jan  1 00:00:00 1970
From: Chris Wright <chrisw@sous-sol.org>
Subject: Re: how to assign a pci device to guest [with qemu.git upstream]?
Date: Wed, 28 Sep 2011 17:56:47 -0700
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Cc: KVM General <kvm@vger.kernel.org>
To: "Ren, Yongjie" <yongjie.ren@intel.com>
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* Ren, Yongjie (yongjie.ren@intel.com) wrote:
> I'm using kvm and qemu upstream on https://github.com/avikivity
> The following command line was right for me about three weeks ago, but now I meet some error.
> # qemu-system-x86_64 -m 1024 -smp 2 -device pci-assign,host=0e:00.0 -hda /root/rhel6u1.img
> output error is like following.
> qemu-system-x86_64: -device pci-assign,host=0d:00.0: Parameter 'driver' expects a driver name
> Try with argument '?' for a list.

Looks like you don't have device assignment support compiled in.
Start with the basics (assuming tree has hw/device-assignment.c):

did your ./configure output show:

KVM device assig. yes

and does your binary agree?

qemu-system-x86_64 -device ? 2>&1 | grep pci-assign

thanks,
-chris