VM cannot startup with 82576 SR-IOV based interface configured

Everything about SR-IOV on this machine are ready. I can run a VM perfectly with SR-IOV using this command:
kvm -name abc \
 -uuid ca3e15a4-8220-94d1-ca8f-81a065eb4dd9 \
 -boot c \
 -m 2048 \
 -hda abc.qcow2 \
 -net nic,vlan=1,macaddr=52:54:00:64:a2:b3,model=e1000 \
 -net tap,vlan=1 \
 -vnc :30 \
 -device pci-assign,host=06:10.0 \
 -device pci-assign,host=08:10.0
---------------------------------------------------------------------

06:10.0, 08:10.0 are VF PCI buses, but when I add these two PCI devices to VM it cannot boot up, showing this message:

Error starting domain: Requested operation is not valid: PCI device 0000:06:10.0 is not assignable

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 66, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1120, in startup
    self._backend.create()
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 551, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: Requested operation is not valid: PCI device 0000:06:10.0 is not assignable

---------------------------------------------------------------------
Following is my configuration XML file:

<domain type='kvm'>
  <name>abc</name>
  <uuid>0c1ef473-c4f2-0a1b-3949-e2f3ff7574c4</uuid>
  <memory>2097152</memory>
  <currentMemory>2097152</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='x86_64' machine='pc-1.0'>hvm</type>
    <boot dev='cdrom'/>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/Development/virt-manager-base/abc.qcow2'/>
      <target dev='hda' bus='ide'/>
      <address type='drive' controller='0' bus='0' unit='0'/>
    </disk>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:44:e6:ec'/>
      <source bridge='virbr0'/>
      <model type='e1000'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='file'>
      <source path='/tmp/sriov-2-serial.txt'/>
      <target port='0'/>
    </serial>
    <console type='file'>
      <source path='/tmp/sriov-2-serial.txt'/>
      <target type='serial' port='0'/>
    </console>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='5914' autoport='no' listen='0.0.0.0'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x06' slot='0x10' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <source>
        <address domain='0x0000' bus='0x08' slot='0x10' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </memballoon>
  </devices>
</domain>

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: virt-manager 0.9.1-1ubuntu5.1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu5
Architecture: amd64
Date: Thu Nov 22 18:04:53 2012
ExecutablePath: /usr/share/virt-manager/virt-manager.py
InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 TERM=xterm-color
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: virt-manager
UpgradeStatus: No upgrade log present (probably fresh install)