Why does Qemu need a new Wayland UI backend?
The main reason why there needs to be a plain and simple Wayland backend
for Qemu UI is to eliminate the Blit (aka GPU copy) that happens if using
a toolkit like GTK or SDL (because they use EGL). The Blit can be eliminated
by sharing the dmabuf fd -- associated with the Guest scanout buffer --
directly with the Host compositor via the linux-dmabuf (unstable) protocol.
Once properly integrated, it would be potentially possible to have the
scanout buffer created by the Guest compositor be placed directly on a
hardware plane on the Host thereby improving performance. Only Guest
compositors that use multiple back buffers (at-least 1 front and 1 back)
and virtio-gpu would benefit from this work.
v2:
- Add support for handling/forwarding keyboard and mouse events.
- Augment handling of events to ensure that they are not lost in a
multi-threaded environment.
- Rebase
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
Cc: Dongwon Kim <dongwon.kim@intel.com>
Cc: Tina Zhang <tina.zhang@intel.com>
Cc: Satyeshwar Singh <satyeshwar.singh@intel.com>
Vivek Kasireddy (2):
virtio-gpu: Add support for VIRTIO_GPU_F_RELEASE_FENCE
ui: Add a plain Wayland backend for Qemu UI
configure | 8 +-
hw/display/virtio-gpu-base.c | 3 +
hw/display/virtio-gpu-udmabuf.c | 4 +-
hw/display/virtio-gpu.c | 54 +-
include/hw/virtio/virtio-gpu.h | 6 +
include/standard-headers/linux/virtio_gpu.h | 2 +
meson.build | 33 +
meson_options.txt | 2 +
qapi/ui.json | 3 +
ui/meson.build | 52 ++
ui/wayland.c | 628 ++++++++++++++++++++
11 files changed, 791 insertions(+), 4 deletions(-)
create mode 100644 ui/wayland.c
--
2.30.2