From: Andre Przywara <andre.przywara@arm.com>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Richard Henderson <richard.henderson@linaro.org>,
linux-kernel@vger.kernel.org, Mark Brown <broonie@kernel.org>,
Sudeep Holla <sudeep.holla@arm.com>,
Ard Biesheuvel <ardb@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/2] arm64: Add support for SMCCC TRNG interface
Date: Tue, 6 Oct 2020 21:18:06 +0100 [thread overview]
Message-ID: <20201006201808.37665-1-andre.przywara@arm.com> (raw)
The ARM architected TRNG firmware interface, described in ARM spec
DEN0098[1], defines an ARM SMCCC based interface to a true random number
generator, provided by firmware.
This is the arm64 implementation of that interface, implemented in
the arch_get_random_*() code.
Patch 1/2 introduces the SMCCC function identifiers, this is extracted
from Ard's patch, to avoid dependencies between the several patches
floating around (ARM, KVM, arm64).
Patch 2/2 detects the interface and calls into the firmware upon a call
to arch_get_random_seed_long().
Support for the "early" variant is under investigation.
This was tested on:
- QEMU -kernel (no SMCCC, regression test)
- Juno w/ standard firmware (SMCCC, but no TRNG: regression test)
- Juno w/ "fake TRNG" firmware (to verify "random" numbers)
- Juno w/ prototype of the h/w Trusted RNG support
- mainline KVM (SMCCC, but no TRNG: regression test)
- Ard's KVM patch (plus hack to inject fake numbers for verification purposes)
Cheers,
Andre
[1] https://developer.arm.com/documentation/den0098/latest/
Andre Przywara (1):
arm64: Add support for SMCCC TRNG firmware interface
Ard Biesheuvel (1):
firmware: smccc: Add SMCCC TRNG function call IDs
arch/arm64/include/asm/archrandom.h | 83 +++++++++++++++++++++++++----
include/linux/arm-smccc.h | 31 +++++++++++
2 files changed, 104 insertions(+), 10 deletions(-)
--
2.17.1
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next reply other threads:[~2020-10-06 20:20 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-06 20:18 Andre Przywara [this message]
2020-10-06 20:18 ` [PATCH 1/2] firmware: smccc: Add SMCCC TRNG function call IDs Andre Przywara
2020-10-06 20:18 ` [PATCH 2/2] arm64: Add support for SMCCC TRNG firmware interface Andre Przywara
2020-10-07 10:48 ` Mark Brown
2020-10-07 14:16 ` James Morse
2020-10-07 14:43 ` André Przywara
2020-10-12 6:35 ` Ard Biesheuvel
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