diff options
| author | Steffen Eiden <seiden@linux.ibm.com> | 2022-05-16 14:33:35 +0300 |
|---|---|---|
| committer | Janosch Frank <frankja@linux.ibm.com> | 2022-05-20 17:38:35 +0300 |
| commit | 4689752c79fa30e91b49b39a9fba93c4d1f3e20c (patch) | |
| tree | e76b156702241c464684e2f0a5f0a07409b0318f /drivers/s390/char/Kconfig | |
| parent | ce522ba9ef7e2d9fb22a39eb3371c0c64e2a433e (diff) | |
| download | linux-4689752c79fa30e91b49b39a9fba93c4d1f3e20c.tar.xz | |
drivers/s390/char: Add Ultravisor io device
This patch adds a new miscdevice to expose some Ultravisor functions
to userspace. Userspace can send IOCTLs to the uvdevice that will then
emit a corresponding Ultravisor Call and hands the result over to
userspace. The uvdevice is available if the Ultravisor Call facility is
present.
Userspace can call the Retrieve Attestation Measurement
Ultravisor Call using IOCTLs on the uvdevice.
The uvdevice will do some sanity checks first.
Then, copy the request data to kernel space, build the UVCB,
perform the UV call, and copy the result back to userspace.
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/kvm/20220516113335.338212-1-seiden@linux.ibm.com/
Message-Id: <20220516113335.338212-1-seiden@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com> (whitespace and tristate fixes, pick)
Diffstat (limited to 'drivers/s390/char/Kconfig')
| -rw-r--r-- | drivers/s390/char/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/s390/char/Kconfig b/drivers/s390/char/Kconfig index 6cc4b19acf85..ef8f41833c1a 100644 --- a/drivers/s390/char/Kconfig +++ b/drivers/s390/char/Kconfig @@ -100,6 +100,16 @@ config SCLP_OFB This option enables the Open-for-Business interface to the s390 Service Element. +config S390_UV_UAPI + def_tristate m + prompt "Ultravisor userspace API" + help + Selecting exposes parts of the UV interface to userspace + by providing a misc character device at /dev/uv. + Using IOCTLs one can interact with the UV. + The device is only available if the Ultravisor + Facility (158) is present. + config S390_TAPE def_tristate m prompt "S/390 tape device support" |