Dear everyone

       Do you know how to modify  vgamem value in the .xml file ?  such as :

<video>
      <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/> // from  instance-0000015e.xml

      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/

</video>

I plan to increase the  volume of vgamem , but  it seems that always keep the original value ‘16384’. Was it limited by QEMU? or others？  Please tell me how I can I modify it ? it's better that help me to make a example for modifing the vgamem..... 

Thank you very much

Best Regards .