[v4,0/6] s390/uvdevice: Expose secret UVCs

Message

Steffen Eiden June 6, 2023, 6:08 p.m. UTC

IBM Secure Execution guests may want to inject secrets into the Ultravisor(UV).
Also they should be able to know which secrets the UV possesses and prevent the
further addition of more secrets.

Therefore, add three new Ultravisor-Calls and expose them via the uvdevice: Add
Secret, List Secrets, and Lock Secrets. The uvdevice still acts as the
messenger only and does not inspect or modify the requests. Only some sanity
checks are made to prevent the kernel from corruption.
Also add a new IOCTL to get information about the supported UV-calls of the
uvdevice. As userspace wants to know which secrets, types, etc. are supported
expose the corresponding UV Query info data to userspace via sysfs.

The series contains:
  * A new info IOCTL, giving information about the capabilities of the uvdevice and UV
  * 3 patches adding new Ultravisor-Calls and expose them to userspace
  * A patch replacing scnprintf with sysfs_emit in arch/s390/kernel/uv.c
  * A patch with an Ultravisor Query Info update for the new secret related information

Changes for v4:
  * more nits from Janosch

Changes for v3:
  * misc nits from Janosch

Changes for v2:
  * use __set_bit instead of the atomic set_bit (Heiko)
  * add a patch for replacing scnprintf with sysfs_emit in arch/s390/kernel/uv.c (Heiko)
  * use scnprintf instead of sysfs_emit for the new sysfs entries in the last patch (Heiko)
  * use hex values in struct definitions (Claudio)

Steffen
Steffen Eiden (6):
  s390/uvdevice: Add info IOCTL
  s390/uvdevice: Add 'Add Secret' UVC
  s390/uvdevice: Add 'List Secrets' UVC
  s390/uvdevice: Add 'Lock Secret Store' UVC
  s390/uv: replace scnprintf with sysfs_emit
  s390/uv: Update query for secret-UVCs

 arch/s390/boot/uv.c                   |   4 +
 arch/s390/include/asm/uv.h            |  32 +++-
 arch/s390/include/uapi/asm/uvdevice.h |  53 +++++-
 arch/s390/kernel/uv.c                 |  98 +++++++----
 drivers/s390/char/uvdevice.c          | 231 +++++++++++++++++++++++++-
 5 files changed, 376 insertions(+), 42 deletions(-)