This patch adds support for dma-bufs to the qemu console interfaces.
It adds a new "struct QemuDmaBuf" to represent a dmabuf with accociated
metatdata (size, format).  It adds three functions (and
DisplayChangeListenerOps operations) to set a dma-buf as display
scanout, as cursor and to release a dmabuf.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
Message-id: 20171010135453.6704-2-kraxel@redhat.com