In this patch we add a "workhorse" function called VirtioGpuSendCommand(), and implement seven simple RPCs atop, for the command types listed in "OvmfPkg/Include/IndustryStandard/VirtioGpu.h". These functions will be called by our EFI_GRAPHICS_OUTPUT_PROTOCOL implementation. Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Jordan Justen <jordan.l.justen@intel.com> Ref: https://tianocore.acgmultimedia.com/show_bug.cgi?id=66 Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>