linux-kernel - Re: [PATCH 5/7] hwrng: exynos: Add SMC based TRNG operation

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Message-ID: <475883bf-0cff-458a-80b2-b27804777239@kernel.org>
Date: Tue, 18 Jun 2024 08:37:56 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sam Protsenko <semen.protsenko@...aro.org>,
 Łukasz Stelmach <l.stelmach@...sung.com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Rob Herring <robh@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Olivia Mackall <olivia@...enic.com>,
 Herbert Xu <herbert@...dor.apana.org.au>,
 Alim Akhtar <alim.akhtar@...sung.com>, linux-samsung-soc@...r.kernel.org,
 linux-crypto@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] hwrng: exynos: Add SMC based TRNG operation

On 18/06/2024 02:37, Sam Protsenko wrote:
> On some Exynos chips like Exynos850 the access to Security Sub System
> (SSS) registers is protected with TrustZone, and therefore only possible
> from EL3 monitor software. The Linux kernel is running in EL1, so the
> only way for the driver to obtain TRNG data is via SMC calls to EL3
> monitor. Implement such SMC operation and use it when QUIRK_SMC is set
> in the corresponding chip driver data.
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> ---

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof