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powerpc: ability to associate pkey to a vma

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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>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ram Pai 2018-01-18 17:50:33 -08:00 committed by Michael Ellerman
parent 5586cf61e1
commit 013a91b39c
3 changed files with 25 additions and 1 deletions
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7
arch/powerpc/include/asm/mman.h
View file

@ -13,6 +13,7 @@
#include <asm/cputable.h>
#include <linux/mm.h>
#include <linux/pkeys.h>
#include <asm/cpu_has_feature.h>
/*
@ -22,7 +23,11 @@
static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
unsigned long pkey)
{
return (prot & PROT_SAO) ? VM_SAO : 0;
#ifdef CONFIG_PPC_MEM_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)

11
arch/powerpc/include/asm/pkeys.h
View file

@ -30,6 +30,17 @@ extern u32 initial_allocation_mask; /* bits set for reserved keys */
#define ARCH_VM_PKEY_FLAGS (VM_PKEY_BIT0 | VM_PKEY_BIT1 | VM_PKEY_BIT2 | \
VM_PKEY_BIT3 | VM_PKEY_BIT4)
/* Override any generic PKEY permission defines */
#define PKEY_DISABLE_EXECUTE 0x4
#define PKEY_ACCESS_MASK (PKEY_DISABLE_ACCESS | \
PKEY_DISABLE_WRITE | \
PKEY_DISABLE_EXECUTE)
static inline u64 pkey_to_vmflag_bits(u16 pkey)
{
return (((u64)pkey << VM_PKEY_SHIFT) & ARCH_VM_PKEY_FLAGS);
}
#define arch_max_pkey() pkeys_total
#define pkey_alloc_mask(pkey) (0x1 << pkey)

8
arch/powerpc/mm/pkeys.c
View file

@ -34,6 +34,14 @@ int pkey_initialize(void)
BUILD_BUG_ON(PKEY_DISABLE_EXECUTE &
(PKEY_DISABLE_ACCESS | PKEY_DISABLE_WRITE));
/*
* pkey_to_vmflag_bits() assumes that the pkey bits are contiguous
* in the vmaflag. Make sure that is really the case.
*/
BUILD_BUG_ON(__builtin_clzl(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT) +
__builtin_popcountl(ARCH_VM_PKEY_FLAGS >> VM_PKEY_SHIFT)
!= (sizeof(u64) * BITS_PER_BYTE));
/*
* Disable the pkey system till everything is in place. A subsequent
* patch will enable it.