From: Richard Henderson <richard.henderson@linaro.org>
To: linux-arm-kernel@lists.infradead.org
Cc: mark.rutland@arm.com, linux-crypto@vger.kernel.org,
ard.biesheuvel@linaro.org
Subject: [PATCH v4 0/1] arm64: Implement archrandom.h for ARMv8.5-RNG
Date: Wed, 6 Nov 2019 15:19:53 +0100 [thread overview]
Message-ID: <20191106141954.30657-1-rth@twiddle.net> (raw)
The ARMv8.5-RNG extension adds a hardware random number generator.
The plumbing for this is already present in the kernel; we just
have to take advantage of that.
Changes since v2:
* Keep arch_get_random{,_seed}_long in sync.
* Use __cpus_have_const_cap before falling back to this_cpu_has_cap.
Changes since v1:
* Use __mrs_s and fix missing cc clobber (Mark),
* Log rng failures with pr_warn (Mark),
* Use __must_check; put RNDR in arch_get_random_long and RNDRRS
in arch_get_random_seed_long (Ard),
* Use ARM64_CPUCAP_WEAK_LOCAL_CPU_FEATURE, and check this_cpu_has_cap
when reading random data.
* Move everything out of line, now that there are 5 other function
calls involved, and to unify the rate limiting on the pr_warn.
Tested with QEMU. What's not tested is hot plugging cpus with differing
capabilities; QEMU would need some extension to allow that sort of thing.
r~
Richard Henderson (1):
arm64: Implement archrandom.h for ARMv8.5-RNG
Documentation/arm64/cpu-feature-registers.rst | 2 +
arch/arm64/include/asm/archrandom.h | 35 ++++++++
arch/arm64/include/asm/cpucaps.h | 3 +-
arch/arm64/include/asm/sysreg.h | 4 +
arch/arm64/kernel/cpufeature.c | 13 +++
arch/arm64/kernel/random.c | 79 +++++++++++++++++++
arch/arm64/Kconfig | 12 +++
arch/arm64/kernel/Makefile | 1 +
drivers/char/Kconfig | 4 +-
9 files changed, 150 insertions(+), 3 deletions(-)
create mode 100644 arch/arm64/include/asm/archrandom.h
create mode 100644 arch/arm64/kernel/random.c
--
2.17.1
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next reply other threads:[~2019-11-06 14:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-06 14:19 Richard Henderson [this message]
2019-11-06 14:19 ` [PATCH v4 1/1] arm64: Implement archrandom.h for ARMv8.5-RNG Richard Henderson
2019-11-06 21:30 ` Ard Biesheuvel
2019-11-08 11:09 ` Richard Henderson
2019-11-08 13:03 ` Ard Biesheuvel
2019-11-08 14:24 ` Ard Biesheuvel
2019-11-08 14:52 ` Richard Henderson
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