[PATCH v2 00/10] Extend PKWM to support user-created wrapping keys

[Srish Srinivasan <ssrish@linux.ibm.com>]

The PKWM trusted source currently uses a single default wrapping key per
LPAR. This key is created during trusted source initialization, and all
trusted keys backed by PKWM are sealed and unsealed using it.

Recent versions of PKWM allow users to create and manage their own wrapping
keys through a set of lifecycle operations. This patch series brings these
PKWM capabilities into the kernel, allowing users to create, manage, and
select wrapping keys for sealing and unsealing their trusted keys, rather
than requiring all trusted keys to use the default wrapping key.

This series adds support for user-created wrapping keys to PLPKS and PKWM.
It begins with seven preparatory cleanup and bug-fix patches that improve
error handling and type consistency, clarify macro naming, prevent
unsupported capabilities from being exposed through sysfs, and update the
documentation and MAINTAINERS entry.

The final three patches add the required hcalls, enable wrapping key
selection by label for PKWM-backed trusted keys, and provide a sysfs
interface for managing wrapping keys from userspace.

Changelog:

v1 -> v2:
- Addressed parameter validation issues reported by Nageswara
- Tweaked PLPKS_WRAPKEY_SYSFS Kconfig help text
- Added two preparatory bug-fix patches
- Cc'd stable@vger.kernel.org where applicable

Srish Srinivasan (10):
  pseries/plpks: update PKS documentation and maintainer entry
  pseries/plpks: fix error handling in plpks_read_var()
  pseries/plpks: improve type consistency and parameter validation
  keys/trusted_keys: propagate wrapping key generation errors
  pseries/plpks: rename the default wrapping key macro
  pseries/plpks: fix self-reference in plpks_var initializer
  pseries/plpks: hide wrapping_features when unsupported
  pseries/plpks: add HCALLs for PKWM wrapping key life cycle management
  keys/trusted_keys: enable PKWM wrapping key selection by label
  pseries/plpks/wrapkey: expose PKWM wrapping key management to
    userspace via sysfs

 .../ABI/testing/sysfs-firmware-plpks          | 106 ++++
 Documentation/arch/powerpc/papr_hcalls.rst    |  49 +-
 .../security/keys/trusted-encrypted.rst       |   4 +-
 MAINTAINERS                                   |   2 +-
 arch/powerpc/include/asm/hvcall.h             |   5 +-
 arch/powerpc/include/asm/plpks.h              |  40 +-
 arch/powerpc/platforms/pseries/Kconfig        |  15 +
 arch/powerpc/platforms/pseries/Makefile       |   1 +
 arch/powerpc/platforms/pseries/plpks-sysfs.c  |  31 +-
 .../platforms/pseries/plpks-wrapkey-sysfs.c   | 407 ++++++++++++
 arch/powerpc/platforms/pseries/plpks.c        | 577 ++++++++++++++++--
 include/keys/trusted_pkwm.h                   |   3 +
 security/keys/trusted-keys/trusted_pkwm.c     |  40 +-
 13 files changed, 1210 insertions(+), 70 deletions(-)
 create mode 100644 arch/powerpc/platforms/pseries/plpks-wrapkey-sysfs.c

-- 
2.52.0