From: Randy Dunlap <rdunlap@infradead.org>
To: Hsin-Yi Wang <hsinyi@chromium.org>, linux-arm-kernel@lists.infradead.org
Cc: Rob Herring <robh+dt@kernel.org>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Frank Rowand <frowand.list@gmail.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@linux.ibm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Miles Chen <miles.chen@mediatek.com>,
James Morse <james.morse@arm.com>,
Andrew Murray <andrew.murray@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Chintan Pandya <cpandya@codeaurora.org>,
Jun Yao <yaojun8558363@gmail.com>, Yu Zhao <yuzhao@google.com>,
Robin Murphy <robin.murphy@arm.com>,
Laura Abbott <labbott@redhat.com>,
Stephen Boyd <swboyd@chromium.org>,
Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH v3 3/3] fdt: add support for rng-seed
Date: Thu, 16 May 2019 08:39:56 -0700 [thread overview]
Message-ID: <932a02f2-a1d3-a8d7-c7a4-2891024d10a2@infradead.org> (raw)
In-Reply-To: <20190516102817.188519-3-hsinyi@chromium.org>
On 5/16/19 3:28 AM, Hsin-Yi Wang wrote:
> Introducing a chosen node, rng-seed, which is an entropy that can be
> passed to kernel called very early to increase initial device
> randomness. Bootloader should provide this entropy and the value is
> read from /chosen/rng-seed in DT.
>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> ---
> change v2->v3:
> 1. use arch hook for fdt pgprot change
> 2. handle CONFIG_KEXEC
> ---
> Documentation/devicetree/bindings/chosen.txt | 14 +++++
> drivers/of/fdt.c | 55 ++++++++++++++++++++
> 2 files changed, 69 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
> index 45e79172a646..fef5c82672dc 100644
> --- a/Documentation/devicetree/bindings/chosen.txt
> +++ b/Documentation/devicetree/bindings/chosen.txt
> @@ -28,6 +28,20 @@ mode) when EFI_RNG_PROTOCOL is supported, it will be overwritten by
> the Linux EFI stub (which will populate the property itself, using
> EFI_RNG_PROTOCOL).
>
> +rng-seed
> +-----------
> +
> +This property served as an entropy to add device randomness. It is parsed
serves
> +as a byte array, e.g.
> +
> +/ {
> + chosen {
> + rng-seed = <0x31 0x95 0x1b 0x3c 0xc9 0xfa 0xb3 ...>;
> + };
> +};
> +
> +This random value should be provided by bootloader.
> +
> stdout-path
> -----------
>
--
~Randy
prev parent reply other threads:[~2019-05-16 15:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-16 10:28 [PATCH v3 1/3] include/of_fdt.h: add a weak arch hook to update fdt pgprot Hsin-Yi Wang
2019-05-16 10:28 ` [PATCH v3 2/3] arm64: implement update_fdt_pgprot() Hsin-Yi Wang
2019-05-16 14:37 ` Rob Herring
2019-05-16 14:39 ` Ard Biesheuvel
2019-05-16 14:43 ` Mark Rutland
2019-05-16 15:17 ` Rob Herring
2019-05-16 14:51 ` Hsin-Yi Wang
2019-05-16 15:32 ` Rob Herring
2019-05-16 16:48 ` Hsin-Yi Wang
2019-05-16 17:34 ` James Morse
2019-05-16 17:44 ` Stephen Boyd
2019-05-16 10:28 ` [PATCH v3 3/3] fdt: add support for rng-seed Hsin-Yi Wang
2019-05-16 15:39 ` Randy Dunlap [this message]
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