OVMF, Hyper-V, virtio, Win7 incompatibility

Host kernel: v4.1-rc4
QEMU: qemu.git tag v2.3.0
OVMF: edk2.git-ovmf-x64-0-20150518.b1004.g54ae9c0.noarch
libvirt: 1.2.13.1-1.fc21.x86_64
Guest: en_windows_7_professional_with_sp1_x64_dvd_u_676939.iso

If I attempt to use the above software versions to start a VM install, I hit one of two problems:

(a) If I use a virtio NIC, the VM aborts with an error similar to:

qemu-system-x86_64: Guest moved used index from 22 to 0

(b) If I use an emulated (e1000) NIC, the VM switches to a black screen when I should have the dancing windows boot animation logo

Both of these are resolved by switching off ALL Hyper-V enlightenments as shown in the below XML.  Enabling any one of them results in the above behavior.

This problem is only seen with OVMF, removing the loader and nvram directives below allows all Hyper-V enlightenments to be enabled, with or without a virtio NIC.

<domain type='kvm'>
  <name>win7-ovmf-demo</name>
  <uuid>a42b96e9-e95d-42c6-9f4a-0236f3d38d95</uuid>
  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>4194304</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <os>
    <type arch='x86_64' machine='pc-i440fx-2.3'>hvm</type>
    <loader readonly='yes' type='pflash'>/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd</loader>
    <nvram>/var/lib/libvirt/qemu/nvram/win7-ovmf-demo_VARS.fd</nvram>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
    <hyperv>
      <relaxed state='off'/>
      <vapic state='off'/>
      <spinlocks state='off'/>
    </hyperv>
  </features>
  <clock offset='localtime'>
    <timer name='rtc' tickpolicy='catchup'/>
    <timer name='pit' tickpolicy='delay'/>
    <timer name='hpet' present='no'/>
    <timer name='hypervclock' present='no'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <pm>
    <suspend-to-mem enabled='no'/>
    <suspend-to-disk enabled='no'/>
  </pm>
  <devices>
    <emulator>/usr/local/bin/qemu-system-x86_64</emulator>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/var/lib/libvirt/images/MSDN/en_windows_7_professional_with_sp1_x64_dvd_u_676939.iso'/>
      <target dev='hdb' bus='ide'/>
      <readonly/>
      <boot order='1'/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
    <controller type='usb' index='0' model='ich9-ehci1'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <master startport='0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0' multifunction='on'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci2'>
      <master startport='2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x1'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci3'>
      <master startport='4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
    </controller>
    <interface type='network'>
      <mac address='52:54:00:9b:49:b9'/>
      <source network='default'/>
      <model type='e1000'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes'/>
    <video>
      <model type='vga' vram='16384' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='none'/>
  </devices>
</domain>