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. Ali Saidi (3): arm/arm64: Add smccc hypervisor service identifiers arm64: export acpi_psci_use_hvc hwrng: Add support for AWS Graviton TRNG MAINTAINERS | 6 ++ arch/arm64/kernel/acpi.c | 1 + drivers/char/hw_random/Kconfig | 13 ++++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/graviton-rng.c | 123 ++++++++++++++++++++++++++++++++++ include/linux/arm-smccc.h | 2 + 6 files changed, 146 insertions(+) create mode 100644 drivers/char/hw_random/graviton-rng.c -- 2.15.3.AMZN
