Hello,my system info:

    virsh verison

And i want to pass through my gpu to my window 7 guest with <hostdev>, next line is comand i use:

     <hostdev mode='subsystem' type='pci' managed='yes' xvga='yes'>

      <source>

        <address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>

      </source>

      <rom bar='on' file='/root/gpu.dump'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>

    </hostdev>

But i get this error: 

        XML document failed to validate against schema: Unable to validate doc against /ocl/share/libvirt/schemas/domain.rng

        Extra element devices in interleave

        Element domain failed to validate content

If i delete xvga='yes',it's ok, but i get a other question, my display is not light.