linux-kernel - Re: [PATCH v6 4/5] arm64: Add support for SMCCC TRNG entropy source

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Message-ID: <20210106131037.GD4752@sirena.org.uk>
Date:   Wed, 6 Jan 2021 13:10:37 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Marc Zyngier <maz@...nel.org>, Theodore Ts'o <tytso@....edu>,
        Sudeep Holla <sudeep.holla@....com>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/5] arm64: Add support for SMCCC TRNG entropy source

On Wed, Jan 06, 2021 at 10:34:52AM +0000, Andre Przywara wrote:
> The ARM architected TRNG firmware interface, described in ARM spec
> DEN0098, defines an ARM SMCCC based interface to a true random number
> generator, provided by firmware.
> This can be discovered via the SMCCC >=v1.1 interface, and provides
> up to 192 bits of entropy per call.

Reviewed-by: Mark Brown <broonie@...nel.org>

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