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| author | Harald Freudenberger <freude@linux.vnet.ibm.com> | 2017-03-17 10:46:31 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-04-26 13:41:35 +0200 |
| commit | 4c637cd8de43416c1b1eef6113e7aa06abacf18d (patch) | |
| tree | 6609483d58b446c515a94b70e91cc55e7fc481a0 /arch/s390/Kconfig | |
| parent | f75fa65d70e2423a03c1b7391bfca410d554b1c5 (diff) | |
| download | linux-4c637cd8de43416c1b1eef6113e7aa06abacf18d.tar.bz2 | |
s390/crypto: Provide s390 specific arch random functionality.
This patch introduces s390 specific arch random functionality.
There exists a generic kernel API for arch specific random
number implementation (see include/linux/random.h). Here
comes the header file and a very small static code part
implementing the arch_random_* API based on the TRNG
subfunction coming with the reworked PRNG instruction.
The arch random implementation hooks into the kernel
initialization and checks for availability of the TRNG
function. In accordance to the arch random API all functions
return false if the TRNG is not available. Otherwise the new
high quality entropy source provides fresh random on each
invocation.
The s390 arch random feature build is controlled via
CONFIG_ARCH_RANDOM. This config option located in
arch/s390/Kconfig is enabled by default and appears
as entry "s390 architectural random number generation API"
in the submenu "Processor type and features" for s390 builds.
Signed-off-by: Harald Freudenberger <freude@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/Kconfig')
| -rw-r--r-- | arch/s390/Kconfig | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 249c2771be0e..ebc0bf7c84d0 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -507,6 +507,21 @@ source kernel/Kconfig.preempt source kernel/Kconfig.hz +config ARCH_RANDOM + def_bool y + prompt "s390 architectural random number generation API" + help + Enable the s390 architectural random number generation API + to provide random data for all consumers within the Linux + kernel. + + When enabled the arch_random_* functions declared in linux/random.h + are implemented. The implementation is based on the s390 CPACF + instruction subfunction TRNG which provides a real true random + number generator. + + If unsure, say Y. + endmenu menu "Memory setup" |