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Date:   Fri, 7 Jun 2019 12:58:35 +0000
From:   "Saidi, Ali" <>
To:     Will Deacon <>
CC:     "" <>,
        "" <>,
        Catalin Marinas <>,
        Matt Mackall <>,
        Herbert Xu <>,
        Arnd Bergmann <>,
        Greg Kroah-Hartman <>,
        "Rindjunsky, Ron" <>,
        Benjamin Herrenschmidt <>,
        "Woodhouse, David" <>
Subject: Re: [PATCH 0/3] Add support for Graviton TRNG

´╗┐On 6/5/19, 7:20 AM, "Will Deacon" <> 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.


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