linux-kernel - Re: [PATCH 0/3] Add support for Graviton TRNG

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Message-ID: <20190701082805.pifv4attux4mddld@willie-the-truck>
Date:   Mon, 1 Jul 2019 09:28:06 +0100
From:   Will Deacon <will@...nel.org>
To:     "Saidi, Ali" <alisaidi@...zon.com>
Cc:     Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Matt Mackall <mpm@...enic.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Rindjunsky, Ron" <ronrindj@...zon.com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "Woodhouse, David" <dwmw@...zon.co.uk>
Subject: Re: [PATCH 0/3] Add support for Graviton TRNG

[Note: this was in my spam folder]

On Fri, Jun 28, 2019 at 06:05:10PM +0000, Saidi, Ali wrote:
> On 6/7/19, 7:59 AM, " Ali Saidi" <alisaidi@...zon.com> wrote:
>     On 6/5/19, 7:20 AM, "Will Deacon" <will.deacon@....com> wrote:
>         On Tue, Jun 04, 2019 at 08:30:57PM +0000, Ali Saidi wrote:
>         > AWS Graviton based systems provide an Arm SMC call in the vendor defined
>         > hypervisor region to read random numbers from a HW TRNG and return them to the
>         > guest. 
>         > 
>         > We've observed slower guest boot and especially reboot times due to lack of
>         > entropy and providing access to a TRNG is meant to address this. 
>         
>         Curious, but why this over something like virtio-rng?
>         
>     This interface allows us to provide the functionality from both EL2
>     and EL3 and support multiple different types of our instances which we
>     unfortunately can't do with virt-io.
>     
> Any additional comments?
> Do you know when you'll have a chance to rebase arm64/smccc-cleanup?

Sorry, Ali, this slipped through the cracks. Marc and I will chat today and
look at respinning what we had before; it should then hopefully be
straightforward enough for you to take that as a base for what you want to
do.

Will