[+Marc] On Mon, Jul 01, 2019 at 09:28:06AM +0100, Will Deacon wrote: > [Note: this was in my spam folder] > > On Fri, Jun 28, 2019 at 06:05:10PM +0000, Saidi, Ali wrote: > > On 6/7/19, 7:59 AM, " Ali Saidi" <alisaidi@xxxxxxxxxx> wrote: > > On 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. > > > > Any additional comments? > > Do you know when you'll have a chance to rebase arm64/smccc-cleanup? > > Sorry, Ali, this slipped through the cracks. Marc and I will chat today and > look at respinning what we had before; it should then hopefully be > straightforward enough for you to take that as a base for what you want to > do. Ok, I hacked on this a bit today and hopefully you can use this as a starting point: https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/log/?h=kvm/hvc I haven't given it any real testing, so apologies for the bugs. Will
