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venus: prefer VIRTGPU_BLOB_MEM_HOST3D for shmems

Chia-I Wu requested to merge olv/mesa:venus-shmem into main

Prefer HOST3D over GUEST for shmems.

This depends on virgl/virglrenderer!649 (merged). It makes shmems memfd-based rather than iov-based, which allows them to be shared in case of process isolation.

This can also be desirable without process isolation, because it makes shmems logically contiguous in the host.

/cc @zzyiwei @ryanneph

Edited by Chia-I Wu

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