https://gitlab.com/rth7680/qemu/-/commits/tgt-arm-bf16
It isn't a large extension, so all done. I added aarch64 simd, aarch32 neon, and sve support all at once. I've tested it via risu vs FVP.
I've based this on my SVE2 branch, since there are some cleanups that made that easier. I'll post patches to qemu-devel next week.
r~