console: add qemu_create_displaysurface_guestmem
This patch adds a qemu_create_displaysurface_guestmem helper function.
Works simliar to qemu_create_displaysurface_from, but accepts a
guest address instead of a host pointer and it handles
cpu_physical_memory_{map,unmap} for you.
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>
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