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Diffstat (limited to 'arch/x86/include/asm/pgtable.h')
-rw-r--r--arch/x86/include/asm/pgtable.h55
1 files changed, 54 insertions, 1 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index f5af95a0c6b8..77037b6f1caa 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -244,6 +244,11 @@ static inline int pud_devmap(pud_t pud)
return 0;
}
#endif
+
+static inline int pgd_devmap(pgd_t pgd)
+{
+ return 0;
+}
#endif
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
@@ -917,7 +922,7 @@ extern pgd_t trampoline_pgd_entry;
static inline void __meminit init_trampoline_default(void)
{
/* Default trampoline pgd value */
- trampoline_pgd_entry = init_level4_pgt[pgd_index(__PAGE_OFFSET)];
+ trampoline_pgd_entry = init_top_pgt[pgd_index(__PAGE_OFFSET)];
}
# ifdef CONFIG_RANDOMIZE_MEMORY
void __meminit init_trampoline(void);
@@ -1185,6 +1190,54 @@ static inline u16 pte_flags_pkey(unsigned long pte_flags)
#endif
}
+static inline bool __pkru_allows_pkey(u16 pkey, bool write)
+{
+ u32 pkru = read_pkru();
+
+ if (!__pkru_allows_read(pkru, pkey))
+ return false;
+ if (write && !__pkru_allows_write(pkru, pkey))
+ return false;
+
+ return true;
+}
+
+/*
+ * 'pteval' can come from a PTE, PMD or PUD. We only check
+ * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
+ * same value on all 3 types.
+ */
+static inline bool __pte_access_permitted(unsigned long pteval, bool write)
+{
+ unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
+
+ if (write)
+ need_pte_bits |= _PAGE_RW;
+
+ if ((pteval & need_pte_bits) != need_pte_bits)
+ return 0;
+
+ return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
+}
+
+#define pte_access_permitted pte_access_permitted
+static inline bool pte_access_permitted(pte_t pte, bool write)
+{
+ return __pte_access_permitted(pte_val(pte), write);
+}
+
+#define pmd_access_permitted pmd_access_permitted
+static inline bool pmd_access_permitted(pmd_t pmd, bool write)
+{
+ return __pte_access_permitted(pmd_val(pmd), write);
+}
+
+#define pud_access_permitted pud_access_permitted
+static inline bool pud_access_permitted(pud_t pud, bool write)
+{
+ return __pte_access_permitted(pud_val(pud), write);
+}
+
#include <asm-generic/pgtable.h>
#endif /* __ASSEMBLY__ */