[0/3] s390: Ultravisor device

Message

Steffen Eiden Feb. 17, 2022, 11:37 a.m. UTC

This series adds an Ultravisor(UV) device letting the userspace send some
Ultravisor calls to the UV. Currently two calls are supported.
Query Ultravisor Information (QUI) and
Receive Attestation Measurement (Attest[ation]).

The UV device is implemented as a miscdevice accepting only IOCTLs.
The IOCTL cmd specifies the UV call and the IOCTL arg the request
and response data depending on the UV call.
The device driver writes the UV response in the ioctl argument data.

The 'uvdevice' does no checks on the request beside faulty userspace
addresses, if sizes are in a sane range before allocating in kernel space,
and other tests that prevent the system from corruption.
Especially, no checks are made, that will be performed by the UV anyway
(E.g. 'invalid command' in case of attestation on unsupported hardware).
These errors are reported back to Userspace using the UV return code
field.

Steffen Eiden (3):
  drivers/s390/char: Add Ultravisor io device
  drivers/s390/char: Add Ultravisor attestation to uvdevice
  selftests: drivers/s390x: Add uvdevice tests

 MAINTAINERS                                   |   3 +
 arch/s390/include/asm/uv.h                    |  23 +-
 arch/s390/include/uapi/asm/uvdevice.h         |  46 +++
 drivers/s390/char/Kconfig                     |   9 +
 drivers/s390/char/Makefile                    |   1 +
 drivers/s390/char/uvdevice.c                  | 325 ++++++++++++++++++
 tools/testing/selftests/Makefile              |   1 +
 tools/testing/selftests/drivers/.gitignore    |   1 +
 .../selftests/drivers/s390x/uvdevice/Makefile |  22 ++
 .../selftests/drivers/s390x/uvdevice/config   |   1 +
 .../drivers/s390x/uvdevice/test_uvdevice.c    | 280 +++++++++++++++
 11 files changed, 711 insertions(+), 1 deletion(-)
 create mode 100644 arch/s390/include/uapi/asm/uvdevice.h
 create mode 100644 drivers/s390/char/uvdevice.c
 create mode 100644 tools/testing/selftests/drivers/s390x/uvdevice/Makefile
 create mode 100644 tools/testing/selftests/drivers/s390x/uvdevice/config
 create mode 100644 tools/testing/selftests/drivers/s390x/uvdevice/test_uvdevice.c