linux-kernel - Re: [PATCH v6 0/5] ARM: arm64: Add SMCCC TRNG entropy service

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Message-ID: <CAMj1kXHW4gPdWXc93eAYpHNU3H+Whg-n2mcEKX=Zro0nANhgSg@mail.gmail.com>
Date:   Wed, 20 Jan 2021 14:15:59 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Will Deacon <will@...nel.org>
Cc:     Marc Zyngier <maz@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Andre Przywara <andre.przywara@....com>,
        Android Kernel Team <kernel-team@...roid.com>,
        "Theodore Ts'o" <tytso@....edu>, Mark Brown <broonie@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        kvmarm <kvmarm@...ts.cs.columbia.edu>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v6 0/5] ARM: arm64: Add SMCCC TRNG entropy service

On Wed, 20 Jan 2021 at 14:01, Will Deacon <will@...nel.org> wrote:
>
> On Wed, 6 Jan 2021 10:34:48 +0000, Andre Przywara wrote:
> > a fix to v5, now *really* fixing the wrong priority of SMCCC vs. RNDR
> > in arch_get_random_seed_long_early(). Apologies for messing this up
> > in v5 and thanks to broonie for being on the watch!
> >
> > Will, Catalin: it would be much appreciated if you could consider taking
> > patch 1/5. This contains the common definitions, and is a prerequisite
> > for every other patch, although they are somewhat independent and likely
> > will need to go through different subsystems.
> >
> > [...]
>
> Applied the first patch only to arm64 (for-next/rng), thanks!
>
> [1/5] firmware: smccc: Add SMCCC TRNG function call IDs
>       https://git.kernel.org/arm64/c/67c6bb56b649
>
> What's the plan for the rest of the series, and I think the related
> change over at [1]?
>

Given that Ted seems to have lost interest in /dev/random patches, I
was hoping [1] could be taken via the arm64 tree instead. Without this
patch, I don't think we should expose the SMCCC RNG interface via
arch_get_random_seed(), given how insanely often it will be called in
that case.

Note that the KVM patch implements the opposite end of this interface,
and is not affected by [1] at all, so that can be taken at any time.