kvmgt local display don't take effect

[charse]

Hi:
    I follow below step:
1. update  kernel version to  gvt-stable-4.14;
2. update  qemu version to stable-2.10.0;
when 1 and 2 is done ,I can see the mdev_supported_types directory;
3. vm install process:
1. use Display Driver Uninstaller in safe mode to remove the default installed Windows Intel GFX drivers;
2. using '-vga qxl' to install the quest and   install the official 15.45 Intel graphics drivers from Intels websit, windows 7 Device Manager show the graphics card is HD Graphics 520;
3. shutdown the system , change it to '-vga none' reboot the windows 7 virtual system ;
start the local vm , use gtk , example script:
/usr/bin/qemu-system-x86_64 \
-m 2048 -smp 2 -M pc \
-name local-display-vm \
-hda /root/kvmgt/win7.qcow2 \
-bios /usr/bin/bios.bin -enable-kvm \
-net nic,macaddr=52:54:00:10:00:1A -net tap,script=/etc/qemu-ifup \
-vga none \
-display gtk,gl=on \
-k en-us \
-machine kernel_irqchip=on \
-global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1 \
-cpu host -usb -usbdevice tablet \
-device vfio-pci,sysfsdev=/sys/bus/pci/devices/0000:00:02.0/0aa0edee-9f5e-11e7-8864-4f7957d97b7c,x-display=on,x-igd-opregion=on


but on qemu display "Guest has not initialized the display (yet)"
What should I do?  Thanks!
Best Regards!
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