[PATCH v2 0/3] Provide PowerVM LPAR Platform KeyStore driver for Self Encrypting Drives

[Nayna Jain]

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:

1. Guest Secure Boot on PowerVM[2]
2. Self Encrypting Drives(SED) on PowerVM[3]

Initially, the PowerVM LPAR Platform KeyStore(PLPKS) driver was defined
as part of RFC patches which included the user interface design for guest
secure boot[2]. While this interface is still in progress, the same driver
is also required for Self Encrypting Drives(SED) support. For this reason,
the driver is being split from the patchset[1] and is now separately posted
with SED arch-specific code.

This patchset provides driver for PowerVM LPAR Platform KeyStore and also
arch-specific code for SED to make use of it.

The dependency patch from patch series[3] is moved to this patchset. This
patchset now builds completely of its own.

[1]https://community.ibm.com/community/user/power/blogs/chris-engel1/2020/11/20/powervm-introduces-the-platform-keystore
[2]https://lore.kernel.org/linuxppc-dev/20220622215648.96723-1-nayna@linux.ibm.com/
[3]https://lore.kernel.org/keyrings/20220718210156.1535955-1-gjoyce@linux.vnet.ibm.com/T/#m8e7b2cbbd26ee1de711bd70967fd0124c85c479f

Changelog:

v2:

* Include feedback from Gregory Joyce, Eric Richter and Murilo Opsfelder Araújo.
* Include suggestions from Michael Ellerman.
* Moved a dependency from generic SED code to this patchset. This patchset now
builds of its own.

Greg Joyce (2):
  lib: define generic accessor functions for arch specific keystore
  powerpc/pseries: Override lib/arch_vars.c with PowerPC architecture
    specific version

Nayna Jain (1):
  powerpc/pseries: define driver for Platform KeyStore

 arch/powerpc/include/asm/hvcall.h             |  11 +
 arch/powerpc/platforms/pseries/Kconfig        |  13 +
 arch/powerpc/platforms/pseries/Makefile       |   2 +
 arch/powerpc/platforms/pseries/plpks.c        | 460 ++++++++++++++++++
 arch/powerpc/platforms/pseries/plpks.h        |  71 +++
 .../platforms/pseries/plpks_arch_ops.c        | 166 +++++++
 include/linux/arch_vars.h                     |  23 +
 lib/Makefile                                  |   2 +-
 lib/arch_vars.c                               |  25 +
 9 files changed, 772 insertions(+), 1 deletion(-)
 create mode 100644 arch/powerpc/platforms/pseries/plpks.c
 create mode 100644 arch/powerpc/platforms/pseries/plpks.h
 create mode 100644 arch/powerpc/platforms/pseries/plpks_arch_ops.c
 create mode 100644 include/linux/arch_vars.h
 create mode 100644 lib/arch_vars.c

-- 
2.27.0