From 029b1d02616f1867588f63c69c25dcbfcade6db9 Mon Sep 17 00:00:00 2001
From: Ram Pai <linuxram@us.ibm.com>
Date: Thu, 18 Jan 2018 17:50:35 -0800
Subject: [PATCH 33/45] powerpc: map vma key-protection bits to pte key bits.
References: FATE#322447, bsc#1078248
Patch-mainline: v4.16-rc1
Git-commit: eb95d016ce3d3404e061c7c85d4362094dc34b3f
Map the key protection bits of the vma to the pkey bits in
the PTE.
The PTE bits used for pkey are 3,4,5,6 and 57. The first
four bits are the same four bits that were freed up initially
in this patch series. remember? :-) Without those four bits
this patch wouldn't be possible.
BUT, on 4k kernel, bit 3, and 4 could not be freed up. remember?
Hence we have to be satisfied with 5, 6 and 7.
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Michal Suchanek <msuchanek@suse.de>
---
arch/powerpc/include/asm/book3s/64/pgtable.h | 25 ++++++++++++++++++++++++-
arch/powerpc/include/asm/mman.h | 6 ++++++
arch/powerpc/include/asm/pkeys.h | 12 ++++++++++++
3 files changed, 42 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h
index 42a59b07eeb0..43bfcf9076e0 100644
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h
+++ b/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -38,6 +38,7 @@
#define _RPAGE_RSV2 0x0800000000000000UL
#define _RPAGE_RSV3 0x0400000000000000UL
#define _RPAGE_RSV4 0x0200000000000000UL
+#define _RPAGE_RSV5 0x00040UL
#define _PAGE_PTE 0x4000000000000000UL /* distinguishes PTEs from pointers */
#define _PAGE_PRESENT 0x8000000000000000UL /* pte contains a translation */
@@ -57,6 +58,25 @@
/* Max physical address bit as per radix table */
#define _RPAGE_PA_MAX 57
+#ifdef CONFIG_PPC_MEM_KEYS
+#ifdef CONFIG_PPC_64K_PAGES
+#define H_PTE_PKEY_BIT0 _RPAGE_RSV1
+#define H_PTE_PKEY_BIT1 _RPAGE_RSV2
+#else /* CONFIG_PPC_64K_PAGES */
+#define H_PTE_PKEY_BIT0 0 /* _RPAGE_RSV1 is not available */
+#define H_PTE_PKEY_BIT1 0 /* _RPAGE_RSV2 is not available */
+#endif /* CONFIG_PPC_64K_PAGES */
+#define H_PTE_PKEY_BIT2 _RPAGE_RSV3
+#define H_PTE_PKEY_BIT3 _RPAGE_RSV4
+#define H_PTE_PKEY_BIT4 _RPAGE_RSV5
+#else /* CONFIG_PPC_MEM_KEYS */
+#define H_PTE_PKEY_BIT0 0
+#define H_PTE_PKEY_BIT1 0
+#define H_PTE_PKEY_BIT2 0
+#define H_PTE_PKEY_BIT3 0
+#define H_PTE_PKEY_BIT4 0
+#endif /* CONFIG_PPC_MEM_KEYS */
+
/*
* Max physical address bit we will use for now.
*
@@ -120,13 +140,16 @@
#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
_PAGE_ACCESSED | _PAGE_SPECIAL | _PAGE_PTE | \
_PAGE_SOFT_DIRTY)
+
+#define H_PTE_PKEY (H_PTE_PKEY_BIT0 | H_PTE_PKEY_BIT1 | H_PTE_PKEY_BIT2 | \
+ H_PTE_PKEY_BIT3 | H_PTE_PKEY_BIT4)
/*
* Mask of bits returned by pte_pgprot()
*/
#define PAGE_PROT_BITS (_PAGE_SAO | _PAGE_NON_IDEMPOTENT | _PAGE_TOLERANT | \
H_PAGE_4K_PFN | _PAGE_PRIVILEGED | _PAGE_ACCESSED | \
_PAGE_READ | _PAGE_WRITE | _PAGE_DIRTY | _PAGE_EXEC | \
- _PAGE_SOFT_DIRTY)
+ _PAGE_SOFT_DIRTY | H_PTE_PKEY)
/*
* We define 2 sets of base prot bits, one for basic pages (ie,
* cacheable kernel and user pages) and one for non cacheable
diff --git a/arch/powerpc/include/asm/mman.h b/arch/powerpc/include/asm/mman.h
index 29994788b9f3..07e3f54de9e3 100644
--- a/arch/powerpc/include/asm/mman.h
+++ b/arch/powerpc/include/asm/mman.h
@@ -33,7 +33,13 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
{
+#ifdef CONFIG_PPC_MEM_KEYS
+ return (vm_flags & VM_SAO) ?
+ __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) :
+ __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags));
+#else
return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
+#endif
}
#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index 24e82260052f..03d8d5053126 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -41,6 +41,18 @@ static inline u64 pkey_to_vmflag_bits(u16 pkey)
return (((u64)pkey << VM_PKEY_SHIFT) & ARCH_VM_PKEY_FLAGS);
}
+static inline u64 vmflag_to_pte_pkey_bits(u64 vm_flags)
+{
+ if (static_branch_likely(&pkey_disabled))
+ return 0x0UL;
+
+ return (((vm_flags & VM_PKEY_BIT0) ? H_PTE_PKEY_BIT4 : 0x0UL) |
+ ((vm_flags & VM_PKEY_BIT1) ? H_PTE_PKEY_BIT3 : 0x0UL) |
+ ((vm_flags & VM_PKEY_BIT2) ? H_PTE_PKEY_BIT2 : 0x0UL) |
+ ((vm_flags & VM_PKEY_BIT3) ? H_PTE_PKEY_BIT1 : 0x0UL) |
+ ((vm_flags & VM_PKEY_BIT4) ? H_PTE_PKEY_BIT0 : 0x0UL));
+}
+
static inline int vma_pkey(struct vm_area_struct *vma)
{
if (static_branch_likely(&pkey_disabled))
--
2.13.6