linux-kernel - Re: [PATCH v5 4/5] arm64: Add support for SMCCC TRNG entropy source

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Date:   Wed, 6 Jan 2021 09:54:32 +0000
From:   Andre Przywara <andre.przywara@....com>
To:     Mark Brown <broonie@...nel.org>
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 v5 4/5] arm64: Add support for SMCCC TRNG entropy source

On Tue, 5 Jan 2021 17:00:14 +0000
Mark Brown <broonie@...nel.org> wrote:

> On Tue, Jan 05, 2021 at 04:36:51PM +0000, Andre Przywara wrote:
> 
> > @@ -77,10 +117,20 @@ arch_get_random_seed_long_early(unsigned long
> > *v) {
> >  	WARN_ON(system_state != SYSTEM_BOOTING);
> >  
> > -	if (!__early_cpu_has_rndr())
> > -		return false;
> > +	if (__early_cpu_has_rndr())
> > +		return __arm64_rndr(v);
> > +
> > +	if (smccc_trng_available) {
> > +		struct arm_smccc_res res;  
> 
> This still seems to be preferring RNDR over SMCCC for the early seed
> unless I'm misreading the diff?

Argh, my apologies for that blunder. I *did* change it, but must have
lost it when rebasing against my debug patches.
Will send a fixed version in a jiffy.

Cheers,
Andre.