[PATCH v11 0/2] ARMv8.5-RNG support

Mark Brown broonie at kernel.org
Fri Jan 17 07:26:40 PST 2020


This series is based on Richard Henderson's previous v7, it addresses
review comments from that version by dropping the boot time RNG
support and adds a new change that uses the v8.5-RNG extension to
seed KASLR when ARCH_RANDOM is enabled.  The boot time support
will be re-added later, there are awkward potential interactons
with CPU feature enumeration which need a bit more thought.

v11:
 - Add a hwcap for v8.5-RNG.
 - Drop the addition of data to the pool, it's of questionable
   value and we need to go back and get the addition of actual
   entropy working anyway.
v10:
 - Spell out that we're adding data not entropy from setup_arch() in
   the commit message for patch 2.
v9:
 - Make another static inline helper for early feature checks.
 - Add init annotations.
 - Use xor to add RNDR output to seed for KASLR.

Mark Brown (1):
  arm64: Use v8.5-RNG entropy for KASLR seed

Richard Henderson (1):
  arm64: Implement archrandom.h for ARMv8.5-RNG

 Documentation/arm64/cpu-feature-registers.rst |  2 +
 Documentation/arm64/elf_hwcaps.rst            |  4 ++
 arch/arm64/Kconfig                            | 12 ++++
 arch/arm64/include/asm/archrandom.h           | 67 +++++++++++++++++++
 arch/arm64/include/asm/cpucaps.h              |  3 +-
 arch/arm64/include/asm/hwcap.h                |  1 +
 arch/arm64/include/asm/sysreg.h               |  4 ++
 arch/arm64/include/uapi/asm/hwcap.h           |  1 +
 arch/arm64/kernel/cpufeature.c                | 14 ++++
 arch/arm64/kernel/kaslr.c                     | 11 +++
 10 files changed, 118 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/include/asm/archrandom.h

-- 
2.20.1




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