From: Ard Biesheuvel <ardb@kernel.org>
To: Neal Liu <neal.liu@mediatek.com>
Cc: Matt Mackall <mpm@selenic.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Rob Herring <robh+dt@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Sean Wang <sean.wang@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
linux-mediatek@lists.infradead.org,
lkml <linux-kernel@vger.kernel.org>,
wsd_upstream@mediatek.com, Crystal Guo <Crystal.Guo@mediatek.com>
Subject: Re: Security Random Number Generator support
Date: Tue, 2 Jun 2020 14:14:33 +0200 [thread overview]
Message-ID: <CAMj1kXHjAdk5=-uSh_=S9j5cz42zr3h6t+YYGy+obevuQDp0fg@mail.gmail.com> (raw)
In-Reply-To: <1591085678-22764-1-git-send-email-neal.liu@mediatek.com>
On Tue, 2 Jun 2020 at 10:15, Neal Liu <neal.liu@mediatek.com> wrote:
>
> These patch series introduce a security random number generator
> which provides a generic interface to get hardware rnd from Secure
> state. The Secure state can be Arm Trusted Firmware(ATF), Trusted
> Execution Environment(TEE), or even EL2 hypervisor.
>
> Patch #1..2 adds sec-rng kernel driver for Trustzone based SoCs.
> For security awareness SoCs on ARMv8 with TrustZone enabled,
> peripherals like entropy sources is not accessible from normal world
> (linux) and rather accessible from secure world (HYP/ATF/TEE) only.
> This driver aims to provide a generic interface to Arm Trusted
> Firmware or Hypervisor rng service.
>
>
> changes since v1:
> - rename mt67xx-rng to mtk-sec-rng since all MediaTek ARMv8 SoCs can reuse
> this driver.
> - refine coding style and unnecessary check.
>
> changes since v2:
> - remove unused comments.
> - remove redundant variable.
>
> changes since v3:
> - add dt-bindings for MediaTek rng with TrustZone enabled.
> - revise HWRNG SMC call fid.
>
> changes since v4:
> - move bindings to the arm/firmware directory.
> - revise driver init flow to check more property.
>
> changes since v5:
> - refactor to more generic security rng driver which
> is not platform specific.
>
> *** BLURB HERE ***
>
> Neal Liu (2):
> dt-bindings: rng: add bindings for sec-rng
> hwrng: add sec-rng driver
>
There is no reason to model a SMC call as a driver, and represent it
via a DT node like this.
It would be much better if this SMC interface is made truly generic,
and wired into the arch_get_random() interface, which can be used much
earlier.
> .../devicetree/bindings/rng/sec-rng.yaml | 53 ++++++
> drivers/char/hw_random/Kconfig | 13 ++
> drivers/char/hw_random/Makefile | 1 +
> drivers/char/hw_random/sec-rng.c | 155 ++++++++++++++++++
> 4 files changed, 222 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/rng/sec-rng.yaml
> create mode 100644 drivers/char/hw_random/sec-rng.c
>
> --
> 2.18.0
next prev parent reply other threads:[~2020-06-02 12:14 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-02 8:14 Security Random Number Generator support Neal Liu
2020-06-02 8:14 ` [PATCH v6 1/2] dt-bindings: rng: add bindings for sec-rng Neal Liu
2020-06-02 8:14 ` [PATCH v6 2/2] hwrng: add sec-rng driver Neal Liu
2020-06-02 10:38 ` Greg Kroah-Hartman
2020-06-02 12:14 ` Ard Biesheuvel [this message]
2020-06-02 13:02 ` Security Random Number Generator support Marc Zyngier
2020-06-03 7:29 ` Neal Liu
2020-06-03 7:40 ` Marc Zyngier
2020-06-03 7:54 ` Neal Liu
2020-06-03 9:48 ` Sudeep Holla
2020-06-03 11:12 ` Marc Zyngier
2020-06-18 9:50 ` Marc Zyngier
2020-06-19 1:47 ` Neal Liu
2020-06-03 9:34 ` Russell King - ARM Linux admin
2020-06-05 7:19 ` Neal Liu
2020-06-05 8:09 ` Russell King - ARM Linux admin
2020-06-05 8:59 ` Neal Liu
2020-06-05 9:27 ` Russell King - ARM Linux admin
2020-06-08 7:49 ` Sumit Garg
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