Re: [PATCH v2] hwrng: Add Arm SMCCC TRNG based driver
From: Andre Przywara <andre.przywara@arm.com>
Date: 2021-07-20 23:20:16
Also in:
linux-crypto, lkml
On Wed, 21 Jul 2021 08:02:42 +1000 Benjamin Herrenschmidt [off-list ref] wrote: Hi,
On Tue, 2021-07-20 at 17:16 +0100, Andre Przywara wrote:quoted
Yes, a similar idea was already brought up before. I think there is even the potential for something like an artificial SMCCC "bus", where those services presentable as devices could be auto-detected (by checking known function IDs), the respective drivers would then probe automatically?Sounds like a boot time killer...
How so? To be clear, at the moment there is basically just the TRNG service we would probe for, maybe FF-A, then adding as we go. But in any case it would be just a handful, and querying is very quick (SMC/HVC, then just a switch/case on the other side, and ERET). Is there any particular scenario you are concerned about? Quick starting guests?
can we instead describe them in DT and/or ACPI ?
I think part of the idea of SMCCC is that it does NOT need firmware advertisement, but can instead be discovered, through a safe interface. Cheers, Andre _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel