Dmitry Osipenko 222ca69401 gpu: Support passing guest fences to host ... Support passing guest fences to host for waiting by using extended VIRTIO_GPU_CMD_SUBMIT_3D command that replaces previously unused padding field with a new 'num_in_fences' field. The in-fence IDs are prepended to the cmdbuf data. There is new corresponding VIRTIO_GPU_F_FENCE_PASSING feature flag, it must be supported by guest in order to activate fence passing on host. There is new VIRTIO_GPU_FLAG_FENCE_SHAREABLE flag for VIRTIO_GPU_CMD_SUBMIT_3D command that is set if job's fence is shareable. Fence passing allows guest to offload dma-fence waiting to host, removing unnecessary stalls in the GPU pipeline. Guest kernel doesn't have to stall job submission anymore until all in-fences are signalled on guest side. This new feature improves GL/VL interop performance up to 2-3x times for native contexts. It will also allow to share host GPU fences with host display subsystem easily for explicit fencing of framebuffer flips within the host kernel display driver, which is useful for virtio-wl. TEST=none BUG=b:253779836 Link: https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/1138 Change-Id: Ie547614c26ff5f3f75ccf203096e9087827be542 Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4679609 Reviewed-by: Daniel Verkamp <dverkamp@chromium.org> Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org> Commit-Queue: Gurchetan Singh <gurchetansingh@chromium.org> Reviewed-by: Ryan Neph <ryanneph@google.com>		2023-08-28 16:05:30 +00:00
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ffi	gpu: Support passing guest fences to host	2023-08-28 16:05:30 +00:00
src	gpu: Support passing guest fences to host	2023-08-28 16:05:30 +00:00
build.rs
Cargo.toml
LICENSE