On Sat, 23 Jul 2022 07:30:45 -0400, Nayna Jain wrote:

PowerVM provides an isolated Platform KeyStore(PKS)[1] storage allocation
for each partition(LPAR) with individually managed access controls to store
sensitive information securely. The Linux Kernel can access this storage by
interfacing with the hypervisor using a new set of hypervisor calls.

This storage can be used for multiple purposes. The current two usecases
are:

[...]

Patch 1 applied to powerpc/next.

[1/3] powerpc/pseries: define driver for Platform KeyStore
      https://git.kernel.org/powerpc/c/2454a7af0f2a42918aa972147a0bec38e6656cd8

cheers