Virglrender got a new unstable API that allows mapping host blobs at a given memory address using MAP_FIXED mmap flag [1]. Usage of this new API brings major performance and stability improvement for venus and drm native contexts, see commit message of the RFC patch for details.
Sending early to collect review feeback and have patch prepared by the time new version of libvirglrenderer will be released with the stabilized API. [1] https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/1374 Based-on: [email protected] Changelog: v3: - Addressed v2 review comments from Akihiko Odaki. - Droped check for CONFIG_WIN32. My current understanding that MAP_FIXED is supported by Cygwin. - Added new patches resetting virgl resources, validating hostmem offset and improving error-handlings. - Added r-b from Akihiko Odaki to the frist patch and t-b from Yiwei Zhang to the map_fixed patch. v2: - Addressed v1 review comments from Akihiko Odaki - Added patch that removes unnecessary memory_region_set_enabled(), suggested by Akihiko Odaki Dmitry Osipenko (7): virtio-gpu: Remove superfluous memory_region_set_enabled() virtio-gpu: Validate hostmem mapping offset virtio-gpu: Make virtio_gpu_virgl_unmap_resource_blob() return -1 on error virtio-gpu: Blame host for virgl blob resource unmapping error virtio-gpu: Destroy virgl resources on virtio-gpu reset virtio-gpu: Make virtio_gpu_virgl_init() return -1 on error virtio-gpu: Support mapping hostmem blobs with map_fixed hw/display/virtio-gpu-gl.c | 51 ++++++++++- hw/display/virtio-gpu-virgl.c | 159 ++++++++++++++++++++++++++------- include/hw/virtio/virtio-gpu.h | 8 +- 3 files changed, 183 insertions(+), 35 deletions(-) -- 2.51.1
