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. The first two patches introduce the new device as a module configured to be compiled directly into the kernel (y) similar to the s390 SCLP and CHSH miscdevice modules. Patch 3/3 introduces selftests which verify error paths of the ioctl. v1->v2: * ioctl returns -ENOIOCTLCMD in case of a invalid ioctl command * streamlined reserved field test * default Kconfig is y instead of m * improved selftest documentation 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 | 11 + drivers/s390/char/Makefile | 1 + drivers/s390/char/uvdevice.c | 308 ++++++++++++++++++ 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 | 281 ++++++++++++++++ 11 files changed, 697 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 -- 2.25.1
