Windows 10 VM blacked-out text

[Alex Williamson]

Hi,

I'm running a host kernel based on Linus' tree merged with
gvt-next-2019-02-01 in order to test EDID support.  QEMU is latest
qemu.git with Gerd's EDID patches applied.  Guest is Windows 10, fully
updated, device manager shows Intel graphics driver version
25.20.100.6472.  I tried to install the latest DCH Intel graphics
drivers but if failed to install.  As seen in the attached image, the
desktop has some fundamental usability issues with certain text fields
being blacked out.  For this reason I have no idea why the new DCH
driver failed to install.  How do I get a usable GVT-g VM desktop?

Hardware i7-8650U, UHD 620 graphics

VM:

    <graphics type='spice'>
      <listen type='none'/>
      <gl enable='yes' rendernode='/dev/dri/by-path/pci-0000:00:02.0-render'/>
    </graphics>
    <video>
      <model type='none'/>
      <alias name='video0'/>
    </video>
    <hostdev mode='subsystem' type='mdev' managed='no' model='vfio-pci' display='on'>
      <source>
        <address uuid='0b2d768f-95ac-4c7e-a20e-dc002b7381fd'/>
      </source>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>
  <qemu:commandline>
    <qemu:arg value='-set'/>
    <qemu:arg value='device.hostdev0.x-igd-opregion=on'/>
    <qemu:arg value='-set'/>
    <qemu:arg value='device.hostdev0.ramfb=on'/>
    <qemu:arg value='-set'/>
    <qemu:arg value='device.hostdev0.driver=vfio-pci-nohotplug'/>
    <qemu:arg value='-set'/>
    <qemu:arg value='device.hostdev0.xres=1900'/>
    <qemu:arg value='-set'/>
    <qemu:arg value='device.hostdev0.yres=930'/>
  </qemu:commandline>

# readlink -f /sys/bus/mdev/devices/0b2d768f-95ac-4c7e-a20e-dc002b7381fd/mdev_type/
/sys/devices/pci0000:00/0000:00:02.0/mdev_supported_types/i915-GVTg_V5_4
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