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venus: no roundtrip needed for shmem backed by BLOB_MEM_HOST3D

Yiwei Zhang requested to merge zzyiwei/mesa:fix-redundant-wait into main

A successful DRM_IOCTL_VIRTGPU_MAP on BLOB_MEM_HOST3D implies a roundtrip, and that implication is guaranteed with virgl/virglrenderer!688 (merged) in render server configuration.

/cc @olv @ryanneph

Edited by Yiwei Zhang

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