linux-kernel - Re: [PATCH v3 2/2] hwrng: Add Arm SMCCC TRNG based driver

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Date:   Tue, 27 Jul 2021 01:59:22 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andre Przywara <andre.przywara@....com>
Cc:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Will Deacon <will@...nel.org>, Ali Saidi <alisaidi@...zon.com>,
        Jon Nettleton <jon@...id-run.com>
Subject: Re: [PATCH v3 2/2] hwrng: Add Arm SMCCC TRNG based driver

On Tue, Jul 27, 2021 at 01:30:04AM +0100, Andre Przywara wrote:

> Now thinking about this, there would probably be some value in making
> the TRNG UUID somehow available, as this can be used to identify flawed
> implementations (general problems in the hardware or backend bugs). But
> this should be some query-able interface, rather than some line in
> dmesg. Any ideas? Might be beyond the scope of this series, though...

I guess you could append it to the name (eg, "SMCCC TRNG ${UUID}")
though it'd be a bit of an eyesore if anyone displays that in UIs much?

A separate version string queryable in parallel with name would be more
work but possibly a bit more sensible, some other hardware entropy
sources will have firmware version numbers or similar they could
usefully report I expect.

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