linux-kernel - [RFC v6 22/62] powerpc: ability to associate pkey to a vma

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Message-Id: <1500177424-13695-23-git-send-email-linuxram@us.ibm.com>
Date:   Sat, 15 Jul 2017 20:56:24 -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, mhocko@...nel.org
Subject: [RFC v6 22/62] powerpc: ability to associate pkey to a vma

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@...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