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Date:   Wed, 5 Jun 2019 13:20:31 +0100
From:   Will Deacon <>
To:     Ali Saidi <>
        Catalin Marinas <>,
        Matt Mackall <>,
        Herbert Xu <>,
        Arnd Bergmann <>,
        Greg Kroah-Hartman <>,
        Ron Rindjunsky <>,
        Benjamin Herrenschmidt <>,
        David Woodhouse <>
Subject: Re: [PATCH 0/3] Add support for Graviton TRNG

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?


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