The ARM architected TRNG firmware interface, described in ARM spec DEN0098[1], defines an ARM SMCCC based interface to a true random number generator, provided by firmware. This series collects all the patches implementing this in various places: as a user feeding into the ARCH_RANDOM pool, both for ARM and arm64, and as a service provider for KVM guests. Patch 1 introduces the interface definition used by all three entities. Patch 2 prepares the Arm SMCCC firmware driver to probe for the interface. This patch is needed to avoid a later dependency on *two* patches (there might be a better solution to this problem). Patch 3 implements the ARM part, patch 4 is the arm64 version. The final patch 5 adds support to provide random numbers to KVM guests. Compared to the initial posts, this version: - triggers the ARCH_RANDOM initialisation from the SMCCC firmware driver - uses a single bool in smccc.c to hold the initialisation state for arm64 - handles endianess correctly in the KVM provider This was tested on: - QEMU -kernel (no SMCCC, regression test) - Juno w/ standard firmware (SMCCC, but no TRNG: regression test) - Juno w/ "fake TRNG" firmware (to verify "random" numbers) - Juno w/ prototype of the h/w Trusted RNG support - mainline KVM (SMCCC, but no TRNG: regression test) - ARM and arm64 KVM guests, using the KVM service in patch 5/5 Based on v5.10-rc2, please let me know if I should rebased on something else. A git repo is accessible at: https://gitlab.arm.com/linux-arm/linux-ap/-/commits/smccc-trng/v2/ Cheers, Andre [1] https://developer.arm.com/documentation/den0098/latest/ Andre Przywara (2): firmware: smccc: Introduce SMCCC TRNG framework arm64: Add support for SMCCC TRNG entropy source Ard Biesheuvel (3): firmware: smccc: Add SMCCC TRNG function call IDs ARM: implement support for SMCCC TRNG entropy source KVM: arm64: implement the TRNG hypervisor call arch/arm/Kconfig | 4 ++ arch/arm/include/asm/archrandom.h | 74 +++++++++++++++++++++++ arch/arm64/include/asm/archrandom.h | 63 +++++++++++++++++--- arch/arm64/include/asm/kvm_host.h | 2 + arch/arm64/kvm/Makefile | 2 +- arch/arm64/kvm/hypercalls.c | 6 ++ arch/arm64/kvm/trng.c | 91 +++++++++++++++++++++++++++++ drivers/firmware/smccc/smccc.c | 5 ++ include/linux/arm-smccc.h | 31 ++++++++++ 9 files changed, 270 insertions(+), 8 deletions(-) create mode 100644 arch/arm/include/asm/archrandom.h create mode 100644 arch/arm64/kvm/trng.c -- 2.17.1 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
