The following custom CPU layout may also have some benefit (at least for my case it may but I have yet to test it properly):
https://github.com/LongQT-sea/qemu-cpu-guide
I think it may be supplementary to creating a GPU enhanced game streaming...
The QEMU parameter to pass through the exact information would be 'host-cache-info=on'. This passes the cache information from the host. Keep in mind however, that this only makes sense when your guest topology (as mapped to vCPUs) matches your...