Need sdl,virgl support. #76

We need virgl support (display sdl). Here is my command line to run. Thats may help to get what I'm talking about.

C:\qemu8\qemu\qemu-system-x86_64 -cpu qemu64,+ssse3,+sse4.1,+sse4.2,+x2apic -bios C:\qemu8\edk2-x86_64.fd ^
-accel whpx,kernel-irqchip=off -smp 4 -m 3072 ^
-machine q35 ^
-display sdl,gl=on,show-cursor=on -device virtio-vga-gl,xres=1280,yres=768 ^
-net nic,model=virtio-net-pci -net user,hostfwd=tcp::5555-:5555 ^
-machine vmport=off -usb -device usb-tablet,bus=usb-bus.0 -device virtio-tablet-pci -device usb-kbd ^
-drive file=C:\qemu8\atv.img,if=virtio,format=raw ^
-device ac97 ^
-cdrom apps.iso

pause