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[RFC v2 0/2] ui: Add a Wayland backend for Qemu UI (v2)

From: Vivek Kasireddy
Subject: [RFC v2 0/2] ui: Add a Wayland backend for Qemu UI (v2)
Date: Mon, 13 Sep 2021 15:20:34 -0700

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.

- 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


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