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

[Saidi, Ali]

ïOn 6/5/19, 7:20 AM, "Will Deacon" <will.deacon@xxxxxxx> 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