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Subject[RFC v6 22/62] powerpc: ability to associate pkey to a vma
Date
arch-independent code expects the arch to  map
a pkey into the vma's protection bit setting.
The patch provides that ability.

Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
arch/powerpc/include/asm/mman.h | 8 +++++++-
arch/powerpc/include/asm/pkeys.h | 18 +++++++++++++++---
2 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h
index 30922f6..067eec2 100644
--- a/arch/powerpc/include/asm/mman.h
+++ b/arch/powerpc/include/asm/mman.h
@@ -13,6 +13,7 @@

#include <asm/cputable.h>
#include <linux/mm.h>
+#include <linux/pkeys.h>
#include <asm/cpu_has_feature.h>

/*
@@ -22,7 +23,12 @@
static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
unsigned long pkey)
{
- return (prot & PROT_SAO) ? VM_SAO : 0;
+#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
+ return (((prot & PROT_SAO) ? VM_SAO : 0) |
+ pkey_to_vmflag_bits(pkey));
+#else
+ return ((prot & PROT_SAO) ? VM_SAO : 0);
+#endif
}
#define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)

diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index 1864148..c92b049 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -14,14 +14,26 @@
PKEY_DISABLE_WRITE |\
PKEY_DISABLE_EXECUTE)

+#define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
+ VM_PKEY_BIT3 | VM_PKEY_BIT4)
+
+static inline u64 pkey_to_vmflag_bits(u16 pkey)
+{
+ if (!pkey_inited)
+ return 0x0UL;
+
+ return (((pkey & 0x1UL) ? VM_PKEY_BIT0 : 0x0UL) |
+ ((pkey & 0x2UL) ? VM_PKEY_BIT1 : 0x0UL) |
+ ((pkey & 0x4UL) ? VM_PKEY_BIT2 : 0x0UL) |
+ ((pkey & 0x8UL) ? VM_PKEY_BIT3 : 0x0UL) |
+ ((pkey & 0x10UL) ? VM_PKEY_BIT4 : 0x0UL));
+}
+
#define arch_max_pkey() 32
#define AMR_RD_BIT 0x1UL
#define AMR_WR_BIT 0x2UL
#define IAMR_EX_BIT 0x1UL
#define AMR_BITS_PER_PKEY 2
-#define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
- VM_PKEY_BIT3 | VM_PKEY_BIT4)
-#define AMR_BITS_PER_PKEY 2
/*
* Bits are in BE format.
* NOTE: key 31, 1, 0 are not used.
--
1.7.1
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