The 9.1 “NVIDIA CUDA Installation Guide for Linux” has a footnote under Table 1:
(*) Only the Tesla GP100 GPU is supported for CUDA 9.1 on POWER8.
(**) Only the Tesla GV100 GPU is supported for CUDA 9.1 on POWER9.
The 9.2 version has
(***) Only the Tesla GP100 GPU is supported for CUDA 9.2 on POWER8.
(****) Only the Tesla GV100 GPU is supported for CUDA 9.2 on POWER8. <— This should be POWER9, shouldn’t it?