A VirtIO GPU display driver for FreeBSD guests running under QEMU or UTM.

This driver replaces and enhances the VirtIO GPU driver built into the kernel,
by enabling /dev/fb0, i.e. registering the framebuffer as a device, such
that programs in the user address space can mmap(2). This allows an X server
to drive the display through the xf86-video-scfb driver.

The driver supports overriding the display resolution advertised by the
host, and flushes the framebuffer to the host at a configurable rate.

The driver must be preloaded from loader.conf; see virtio_gpu_qemu(4) for
more information.