Greetings, I'd like to introduce you my attempt to enable virglrenderer backend for rutabaga empowered virtio-gpu device. I am aware that there have been effort in supporting venus in virtio-gpu-virgl.c [1], but there is no reason to prevent us from leveraging the virglrenderer component in rutabaga_gfx, especially it being not very hard to add this functionality.
Generally, the gap is the polling capability, i.e., virglrenderer requires the main thread (namely the GPU command handling thread) to poll virglrenderer at proper moments, which is not yet supported in virtio-gpu-rutabaga device. This patch set try to add this so that virglrenderer backend (including virgl and venus) can work as expected. Slight change to rutabaga_gfx_ffi is also a requirement, which is included in [2]. Further effort is required to tune the performance, since copying is present before the rendered images get displayed. But I still think this patch set could be a good starting point for the pending work. For those interested in setting up environment and playing around with this patch set, here is guideline in brief: 1. Clone the master/main branch of virglrenderer, compile and install it. git clone https://gitlab.freedesktop.org/virgl/virglrenderer cd virglrenderer meson setup builddir \ --prefix=$INSTALL_DIR/virglrenderer \ -Dvenus=true ninja -C builddir install 2. Clone the patched CrosVM, build and install rutabaga_gfx_ffi. git clone -b rutabaga_ffi_virgl https://github.com/phreer/crosvm.git cd crosvm/rutabaga_gfx/ffi export PKG_CONFIG_PATH=$INSTALL_DIR/virglrenderer/lib64/pkgconfig/ meson setup builddir/ \ --prefix $HOME/install/rutabaga_gfx/rutabaga_gfx_ffi/ \ -Dvirglrenderer=true ninja -C builddir install 3. Applied this patch set to QEMU, build and install it: cd qemu # Apply this patch set atop main branch ... mkdir builddir; cd builddir ../configure --prefix=$INSTALL_DIR/qemu \ --target-list=x86_64-softmmu \ --disable-virglrenderer \ --enable-rutabaga_gfx ninja -C builddir install 4. If you are lucky and everything goes fine, you are prepared to launch VM with virglrenderer backed virtio-gpu-rutabaga device: export LD_LIBRARY_PATH=$INSTALL_DIR/virglrenderer/lib64/:$LD_LIBRARY_PATH export LD_LIBRARY_PATH=$INSTALL_DIR/rutabaga_gfx_ffi/lib64/:$LD_LIBRARY_PATH $INSTALL_DIR/qemu/bin/qemu-system-x86_64 $QEMU -d guest_errors -enable-kvm -M q35 -smp 4 -m $MEM \ -object memory-backend-memfd,id=mem1,size=$MEM \ -machine memory-backend=mem1 \ -device virtio-vga-rutabaga,venus=on,virgl2=on,wsi=surfaceless,hostmem=$MEM \ Note: - You might need this patch set [3] to avoid KVM bad address error when you are running on a GPU using TTM for memory management. [1] https://lore.kernel.org/all/dba6eb97-e1d1-4694-bfb6-e72db9571...@daynix.com/T/ [2] https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5599645/1 [3] https://lore.kernel.org/kvm/20240229025759.1187910-1-steve...@google.com/ Weifeng Liu (3): virtio-gpu: rutabaga: Properly set stride when copying resources virtio-gpu: rutabaga: Poll rutabaga upon events virtio-gpu: rutabaga: Add options to enable virgl and venus contexts hw/display/virtio-gpu-rutabaga.c | 104 ++++++++++++++++++++++++++++++- include/hw/virtio/virtio-gpu.h | 1 + 2 files changed, 104 insertions(+), 1 deletion(-) -- 2.45.0