mbox series

[RFC,0/2] arm64: Support Enhanced PAN

Message ID 20201113152023.102855-1-vladimir.murzin@arm.com (mailing list archive)
Headers show
Series arm64: Support Enhanced PAN | expand

Message

Vladimir Murzin Nov. 13, 2020, 3:20 p.m. UTC 
Hi

ARM architecture gains support of Enhanced Privileged Access Never
(EPAN) which allows Privileged Access Never to be used with
Execute-only mappings.

As a consequence 24cecc377463 ("arm64: Revert support for execute-only
user mappings") can be revisited and re-enabled.

Thanks!

Vladimir Murzin (2):
  arm64: Support execute-only permissions with Enhanced PAN
  arm64: Expose EPAN support via HWCAPS2_EPAN

 arch/arm64/Kconfig                    | 17 +++++++++++++++++
 arch/arm64/include/asm/cpucaps.h      |  3 ++-
 arch/arm64/include/asm/hwcap.h        |  1 +
 arch/arm64/include/asm/pgtable-prot.h |  5 +++--
 arch/arm64/include/asm/pgtable.h      | 23 +++++++++++++++++++++--
 arch/arm64/include/asm/sysreg.h       |  2 ++
 arch/arm64/include/uapi/asm/hwcap.h   |  1 +
 arch/arm64/kernel/cpufeature.c        | 23 +++++++++++++++++++++++
 arch/arm64/kernel/cpuinfo.c           |  1 +
 arch/arm64/mm/fault.c                 |  3 +++
 10 files changed, 74 insertions(+), 5 deletions(-)