basic setup to initialize the pkey system. Only 64K kernel in HPT
mode, enables the pkey system.

Signed-off-by: Ram Pai <redacted>
---
 arch/powerpc/Kconfig                   |   16 ++++++++++
 arch/powerpc/include/asm/mmu_context.h |    5 +++
 arch/powerpc/include/asm/pkeys.h       |   51 ++++++++++++++++++++++++++++++++
 arch/powerpc/kernel/setup_64.c         |    4 ++
 arch/powerpc/mm/Makefile               |    1 +
 arch/powerpc/mm/hash_utils_64.c        |    1 +
 arch/powerpc/mm/pkeys.c                |   18 +++++++++++
 7 files changed, 96 insertions(+), 0 deletions(-)
 create mode 100644 arch/powerpc/include/asm/pkeys.h
 create mode 100644 arch/powerpc/mm/pkeys.c

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index bf4391d..5c60fd6 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig

@@ -855,6 +855,22 @@ config SECCOMP

 	  If unsure, say Y. Only embedded should say N here.

+config PPC64_MEMORY_PROTECTION_KEYS
+	prompt "PowerPC Memory Protection Keys"
+	def_bool y
+	# Note: only available in 64-bit mode
+	depends on PPC64 && PPC_64K_PAGES
+	select ARCH_USES_HIGH_VMA_FLAGS
+	select ARCH_HAS_PKEYS
+	---help---
+	  Memory Protection Keys provides a mechanism for enforcing
+	  page-based protections, but without requiring modification of the
+	  page tables when an application changes protection domains.
+
+	  For details, see Documentation/vm/protection-keys.txt
+
+	  If unsure, say y.
+
 endmenu

 config ISA_DMA_API

diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index da7e943..4b93547 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h

@@ -181,5 +181,10 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
 	/* by default, allow everything */