$ qemu-system-x86_64 ... -device virtio-vga
# lspci -d 1af4:1050 -knn
00:03.0 VGA compatible controller [0300]: Red Hat, Inc Device [1af4:1050] (rev 01)
Subsystem: Red Hat, Inc Device [1af4:1100]
Kernel driver in use: virtio-pci
Kernel modules: virtio_pci
# dmesg | grep virtio
[ 1.727390] [drm] pci: virtio-vga detected
[ 1.729315] [drm] virtio vbuffers: 80 bufs, 192B each, 15kB total.
[ 2.023845] virtio_gpu virtio0: fb0: virtiodrmfb frame buffer device
[ 2.023846] virtio_gpu virtio0: registered panic notifier
[ 2.043135] [drm] Initialized virtio_gpu 0.0.1 0 on minor 0
# journalctl -b -u libvirtd.service -o cat
Starting Virtualization daemon...
Started Virtualization daemon.
libvirt version: 1.2.17, package: 1.fc23 (Fedora Project, 2015-07-14-18:18:48,
buildvm-03.phx2.fedoraproject.org)
unsupported configuration: unknown video model 'virtio'
Soonish?