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Some PowerNV systems include a hardware random-number generator. This HWRNG is present on POWER7+ and POWER8 chips and is capable of generating one 64-bit random number every microsecond. The random numbers are produced by sampling a set of 64 unstable high-frequency oscillators and are almost completely entropic. PAPR defines an H_RANDOM hypercall which guests can use to obtain one 64-bit random sample from the HWRNG. This adds a real-mode implementation of the H_RANDOM hypercall. This hypercall was implemented in real mode because the latency of reading the HWRNG is generally small compared to the latency of a guest exit and entry for all the threads in the same virtual core. Userspace can detect the presence of the HWRNG and the H_RANDOM implementation by querying the KVM_CAP_PPC_HWRNG capability. The H_RANDOM hypercall implementation will only be invoked when the guest does an H_RANDOM hypercall if userspace first enables the in-kernel H_RANDOM implementation using the KVM_CAP_PPC_ENABLE_HCALL capability. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de> |
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| .. | ||
| eeh-ioda.c | ||
| eeh-powernv.c | ||
| Kconfig | ||
| Makefile | ||
| opal-async.c | ||
| opal-dump.c | ||
| opal-elog.c | ||
| opal-flash.c | ||
| opal-hmi.c | ||
| opal-lpc.c | ||
| opal-memory-errors.c | ||
| opal-msglog.c | ||
| opal-nvram.c | ||
| opal-power.c | ||
| opal-rtc.c | ||
| opal-sensor.c | ||
| opal-sysparam.c | ||
| opal-tracepoints.c | ||
| opal-wrappers.S | ||
| opal-xscom.c | ||
| opal.c | ||
| pci-ioda.c | ||
| pci-p5ioc2.c | ||
| pci.c | ||
| pci.h | ||
| powernv.h | ||
| rng.c | ||
| setup.c | ||
| smp.c | ||
| subcore-asm.S | ||
| subcore.c | ||
| subcore.h | ||