linux-kernel - Re: Security Random Number Generator support

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Date:   Wed, 03 Jun 2020 12:12:05 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Neal Liu <neal.liu@...iatek.com>
Cc:     Julius Werner <jwerner@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sean Wang <sean.wang@...nel.org>,
        linux-mediatek@...ts.infradead.org,
        lkml <linux-kernel@...r.kernel.org>,
        wsd_upstream <wsd_upstream@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Matt Mackall <mpm@...enic.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Crystal Guo (郭晶) 
        <Crystal.Guo@...iatek.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        mark.rutland@....com, Jose.Marinho@....com
Subject: Re: Security Random Number Generator support

On 2020-06-03 08:54, Neal Liu wrote:
> On Wed, 2020-06-03 at 08:40 +0100, Marc Zyngier wrote:
>> On 2020-06-03 08:29, Neal Liu wrote:

[...]

>> > Could you give us a hint how to make this SMC interface more generic in
>> > addition to my approach?
>> > There is no (easy) way to get platform-independent SMC function ID,
>> > which is why we encode it into device tree, and provide a generic
>> > driver. In this way, different devices can be mapped and then get
>> > different function ID internally.
>> 
>> The idea is simply to have *one* single ID that caters for all
>> implementations, just like we did for PSCI at the time. This
>> requires ARM to edict a standard, which is what I was referring
>> to above.
>> 
>> There is zero benefit in having a platform-dependent ID. It just
>> pointlessly increases complexity, and means we cannot use the RNG
>> before the firmware tables are available (yes, we need it that
>> early).
>> 
>>          M.
> 
> Do you know which ARM expert could edict this standard?
> Or is there any chance that we can make one? And be reviewed by
> maintainers?

Sudeep already mentioned Jose's effort to offer a standard.
Hopefully he will *soon* be able to give us something that can be
implemented everywhere (firmware, kernel, but also hypervisors),
as the need exists across the whole stack.

         M.
-- 
Jazz is not dead. It just smells funny...