Patch posted:
https://www.redhat.com/archives/libguestfs/2016-February/thread.html#00241

Upstream in:
https://github.com/libguestfs/libguestfs/commit/534dfcf84ebd89d4c008e4f296a92b4b278087fe
https://github.com/libguestfs/libguestfs/commit/660246dcbc4cf4d333853fbd0b39f4f857029f45

Moving back to assigned.  It turns out that qxl+vnc doesn't
work.  If we install qxl drivers, we must change the device
to spice.

Actually, I'm going to ask the virt team to verify if this
is correct or not before making any further changes.

I'm going to declare that the current behaviour (both in RHEL and
upstream) is the correct behaviour.  qxl + vnc is supported.

(In reply to Richard W.M. Jones from comment #5)
> I'm going to declare that the current behaviour (both in RHEL and
> upstream) is the correct behaviour.  qxl + vnc is supported.

Thanks for make it clear,this bug can be added into erratum and QE will change status after test PASS.

This bug works fine with linux guests,but for windows guest,it still applies: The adds <graphics type="vnc"> when the driver is QXL and <graphics type="spice"> when the driver is Cirrus. 

1.For windows guests(win2008r2,win7) from esx server which will use QXL driver,the xml shows as below after conversion:
    <graphics type='vnc' port='-1' autoport='yes'/>
    <video>
      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>

2.For windows guests(win2008,win2003,windows 10,windows 2012,windows 8) from esx server which will use VGA,the xml shows as below after conversion:
    <graphics type='spice' autoport='yes'/>
    <video>
      <model type='cirrus' vram='16384' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>

All guests from esx server have no graphics part in xml before conversion.
eg:virsh connect to esx6.0 server and get xml file of guest.
# dumpxml esx6.0-win2008r2-x86_64 
<domain type='vmware' xmlns:vmware='http://libvirt.org/schemas/domain/vmware/1.0'>
  <name>esx6.0-win2008r2-x86_64</name>
  <uuid>564d3e2f-84f3-0b4f-05b7-2141186bdf9a</uuid>
  <memory unit='KiB'>1048576</memory>
  <currentMemory unit='KiB'>1048576</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <os>
    <type arch='x86_64'>hvm</type>
  </os>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <disk type='file' device='disk'>
      <source file='[ESX6.0] esx6.0-win2008r2-x86_64/esx6.0-win2008r2-x86_64.vmdk'/>
      <target dev='sda' bus='scsi'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <source file='[win-iso] Windows_Server_2008_R2_GA_EN.iso'/>
      <target dev='hda' bus='ide'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <controller type='scsi' index='0' model='lsisas1068'/>
    <controller type='ide' index='0'/>
    <interface type='bridge'>
      <mac address='00:0c:29:6b:df:9a'/>
      <source bridge='VM Network'/>
      <model type='e1000'/>
    </interface>
    <video>
      <model type='vmvga' vram='8192'/>
    </video>
  </devices>
  <vmware:datacenterpath>data</vmware:datacenterpath>
</domain>

Refer to comment 8,move this bug to ASSIGNED.

(In reply to tingting zheng from comment #8)
> This bug works fine with linux guests,but for windows guest,it still
> applies: The adds <graphics type="vnc"> when the driver is QXL and <graphics
> type="spice"> when the driver is Cirrus. 
> 
> 1.For windows guests(win2008r2,win7) from esx server which will use QXL
> driver,the xml shows as below after conversion:
>     <graphics type='vnc' port='-1' autoport='yes'/>
>     <video>
>       <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x02'
> function='0x0'/>
>     </video>
> 
> 2.For windows guests(win2008,win2003,windows 10,windows 2012,windows 8) from
> esx server which will use VGA,the xml shows as below after conversion:
>     <graphics type='spice' autoport='yes'/>
>     <video>
>       <model type='cirrus' vram='16384' heads='1'/>
>       <address type='pci' domain='0x0000' bus='0x00' slot='0x02'
> function='0x0'/>
>     </video>


Sorry,I've made a mistake.
The results are come from the auto job and the colleague who are debugging the auto job forget to upgrade virt-v2v to latest version.

I retested the bug with latest version and the above issue can not be reproduced,so I move the bug back to ON_QA.

I can reproduce it with:
libguestfs-1.31.7-1.el7.x86_64
virt-v2v-1.31.7-1.el7.x86_64

Steps: 
1,Prepare a guest with spice graphics and cirrus driver
#virsh dumpxml rhel6.6
…
<graphics type='spice' autoport='yes' keymap='en-us'/>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
…

2,Convert it using virt-v2v 
#virt-v2v -o libvirt -of raw -os default rhel6.6 -b virbr0 -on aa 
Convert successfully without any error notification
3,Check the xml file after converted it
virsh dumpxml aa | grep graphics -A6
<graphics type='vnc' port='-1' autoport='yes' keymap='en-us'/>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
It’s changed to vnc+cirrus instead of spice+qxl
Testing with:
libguestfs-1.32.3-1.el7.x86_64
virt-v2v-1.32.3-1.el7.x86_64
The testing steps is same as reproduce steps 
Scenarios 1: spice graphics with cirrus driver
virsh dumpxml rhel6.6 | grep graphics -A 6
<graphics type='spice' autoport='yes' keymap='en-us'/>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='cirrus' vram='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
After steps 3,
virsh dumpxml bb | grep graphics -A6
<graphics type='spice' autoport='yes' keymap='en-us'/>
<sound model='ich6'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</sound>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
Result:
Spice + cirrus =>Spice+qxl 
Check the video driver if is qxl after boot the guest
cat /var/log/Xorg.0.log | grep -i qxl
…
[ 31.719] (II) qxl(0): Creating default Display subsection in Screen section
[ 31.719] (==) qxl(0): Depth 24, (--) framebuffer bpp 32
[ 31.719] (==) qxl(0): RGB weight 888
[ 31.719] (==) qxl(0): Default visual is TrueColor
[ 31.719] (==) qxl(0): Using gamma correction (1.0, 1.0, 1.0)
...

Scenarios 2:spice with qxl 
Result:
spice+qxl=>spice+qxl
The video driver is qxl

Scenarios 3:VNC with cirrus 
Result:
vnc+cirrus=>vnc+qxl
The video driver is qxl

Scenarios 4, vnc with qxl
Result:
vnc+qxl =>vnc+qxl 
The video driver is qxl
Refer above comments, the bug has already been fixed ,so move it to VERIFIED

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2576.html