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

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Message-ID: <7EC45708-38A1-4826-BC82-298EFAAE30B1@amazon.com>
Date:   Fri, 7 Jun 2019 12:58:35 +0000
From:   "Saidi, Ali" <alisaidi@...zon.com>
To:     Will Deacon <will.deacon@....com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rindjunsky, Ron" <ronrindj@...zon.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "Woodhouse, David" <dwmw@...zon.co.uk>
Subject: Re: [PATCH 0/3] Add support for Graviton TRNG



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.

Ali