The patch-series enhances memory protection keys feature. The patch(1) introduces an additional vma bit to support 32 pkeys. PowerPC supports 32 pkeys. The patch(2,3) introduces a new interface arch_pkeys_enabled(), this interface can be used by arch-neutral code to display protection key value in smap. The patch(4) introduces a syfs interface, to display the static attributes of the protection key. Eg: max number of keys. The last two patches, (5,6) update documentation. A separate patch series that enhances selftest will follow. The entire patch series that enables pkeys on powerpc is at https://github.com/rampai/memorykeys.git memkey.v9-rc1 Testing: ------- This patches are tested on powerpc platform using a enhaced set of selftests. Could not test on x86 since I do not have access to one with pkey support. History: ------- version v3: (1) sysfs interface - thanks Thiago. (2) Documentation update. version v2: (1) Documentation is updated to better capture the semantics. (2) introduced arch_pkeys_enabled() to find if an arch enables pkeys. Correspond- ing change in logic that displays key value in smaps. (3) code rearranged in many places based on comments from Dave Hansen, Balbir, Anshuman. version v1: Initial version Ram Pai (5): mm: introduce an additional vma bit for powerpc pkey mm, x86 : introduce arch_pkeys_enabled() mm: display pkey in smaps if arch_pkeys_enabled() is true Documentation/x86: Move protecton key documentation to arch neutral directory Documentation/vm: PowerPC specific updates to memory protection keys Thiago Jung Bauermann (1): mm/mprotect, powerpc/mm/pkeys, x86/mm/pkeys: Add sysfs interface Documentation/vm/protection-keys.txt | 160 +++++++++++++++++++++++++++++++++ Documentation/x86/protection-keys.txt | 85 ----------------- arch/powerpc/include/asm/pkeys.h | 2 + arch/powerpc/mm/pkeys.c | 20 ++++ arch/x86/include/asm/mmu_context.h | 4 +- arch/x86/include/asm/pkeys.h | 2 + arch/x86/kernel/fpu/xstate.c | 5 + arch/x86/kernel/setup.c | 8 -- arch/x86/mm/pkeys.c | 8 ++ fs/proc/task_mmu.c | 17 ++-- include/linux/mm.h | 16 ++-- include/linux/pkeys.h | 9 ++ mm/mprotect.c | 88 ++++++++++++++++++ 13 files changed, 317 insertions(+), 107 deletions(-) create mode 100644 Documentation/vm/protection-keys.txt delete mode 100644 Documentation/x86/protection-keys.txt
