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

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Message-ID: <3104F396-094F-454C-8308-BF651FAB99AB@amazon.com>
Date:   Fri, 28 Jun 2019 18:05:10 +0000
From:   "Saidi, Ali" <alisaidi@...zon.com>
To:     Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>
CC:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        Catalin Marinas <catalin.marinas@....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>,
        Matt Mackall <mpm@...enic.com>,
        "Woodhouse, David" <dwmw@...zon.co.uk>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 0/3] Add support for Graviton TRNG

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.
    
Will,

Any additional comments?

Mark,

Do you know when you'll have a chance to rebase arm64/smccc-cleanup?

Thanks,
Ali