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Date: Wed, 21 Jun 2017 18:39:31 -0700
From: Ram Pai <linuxram@...ibm.com>
To: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
linux-arch@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Cc: benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
khandual@...ux.vnet.ibm.com, aneesh.kumar@...ux.vnet.ibm.com,
bsingharora@...il.com, dave.hansen@...el.com, hbabu@...ibm.com,
linuxram@...ibm.com, arnd@...db.de, akpm@...ux-foundation.org,
corbet@....net, mingo@...hat.com
Subject: [RFC v3 15/23] powerpc: Program HPTE key protection bits
Map the PTE protection key bits to the HPTE key protection bits,
while creating HPTE entries.
Signed-off-by: Ram Pai <linuxram@...ibm.com>
---
arch/powerpc/include/asm/book3s/64/mmu-hash.h | 5 +++++
arch/powerpc/include/asm/pkeys.h | 7 +++++++
arch/powerpc/mm/hash_utils_64.c | 5 +++++
3 files changed, 17 insertions(+)
diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index 6981a52..f7a6ed3 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
@@ -90,6 +90,8 @@
#define HPTE_R_PP0 ASM_CONST(0x8000000000000000)
#define HPTE_R_TS ASM_CONST(0x4000000000000000)
#define HPTE_R_KEY_HI ASM_CONST(0x3000000000000000)
+#define HPTE_R_KEY_BIT0 ASM_CONST(0x2000000000000000)
+#define HPTE_R_KEY_BIT1 ASM_CONST(0x1000000000000000)
#define HPTE_R_RPN_SHIFT 12
#define HPTE_R_RPN ASM_CONST(0x0ffffffffffff000)
#define HPTE_R_RPN_3_0 ASM_CONST(0x01fffffffffff000)
@@ -104,6 +106,9 @@
#define HPTE_R_C ASM_CONST(0x0000000000000080)
#define HPTE_R_R ASM_CONST(0x0000000000000100)
#define HPTE_R_KEY_LO ASM_CONST(0x0000000000000e00)
+#define HPTE_R_KEY_BIT2 ASM_CONST(0x0000000000000800)
+#define HPTE_R_KEY_BIT3 ASM_CONST(0x0000000000000400)
+#define HPTE_R_KEY_BIT4 ASM_CONST(0x0000000000000200)
#define HPTE_V_1TB_SEG ASM_CONST(0x4000000000000000)
#define HPTE_V_VRMA_MASK ASM_CONST(0x4001ffffff000000)
diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index 0f3dca8..af3882f 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -27,6 +27,13 @@
((vm_flags & VM_PKEY_BIT3) ? H_PAGE_PKEY_BIT1 : 0x0UL) | \
((vm_flags & VM_PKEY_BIT4) ? H_PAGE_PKEY_BIT0 : 0x0UL))
+#define pte_to_hpte_pkey_bits(pteflags) \
+ (((pteflags & H_PAGE_PKEY_BIT0) ? HPTE_R_KEY_BIT0 : 0x0UL) | \
+ ((pteflags & H_PAGE_PKEY_BIT1) ? HPTE_R_KEY_BIT1 : 0x0UL) | \
+ ((pteflags & H_PAGE_PKEY_BIT2) ? HPTE_R_KEY_BIT2 : 0x0UL) | \
+ ((pteflags & H_PAGE_PKEY_BIT3) ? HPTE_R_KEY_BIT3 : 0x0UL) | \
+ ((pteflags & H_PAGE_PKEY_BIT4) ? HPTE_R_KEY_BIT4 : 0x0UL))
+
/*
* Bits are in BE format.
* NOTE: key 31, 1, 0 are not used.
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index b3bc5d6..34bc94c 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -35,6 +35,7 @@
#include <linux/memblock.h>
#include <linux/context_tracking.h>
#include <linux/libfdt.h>
+#include <linux/pkeys.h>
#include <asm/debugfs.h>
#include <asm/processor.h>
@@ -230,6 +231,10 @@ unsigned long htab_convert_pte_flags(unsigned long pteflags)
*/
rflags |= HPTE_R_M;
+#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
+ rflags |= pte_to_hpte_pkey_bits(pteflags);
+#endif
+
return rflags;
}
--
1.8.3.1
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