[PATCH 07/16] x86/mm: Move two more functions from pgtable_64.h to pgtable.h

[Joerg Roedel]

From: Joerg Roedel <jroedel@xxxxxxx>

These two functions are required for PTI on 32 bit:

	* pgdp_maps_userspace()
	* pgd_large()

Also re-implement pgdp_maps_userspace() so that it will work
on 64 and 32 bit kernels.

Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
 arch/x86/include/asm/pgtable.h    | 16 ++++++++++++++++
 arch/x86/include/asm/pgtable_64.h | 15 ---------------
 2 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 0a9f746cbdc1..abafe4d7fd3e 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -1109,6 +1109,22 @@ static inline int pud_write(pud_t pud)
 	return pud_flags(pud) & _PAGE_RW;
 }
 
+/*
+ * Page table pages are page-aligned.  The lower half of the top
+ * level is used for userspace and the top half for the kernel.
+ *
+ * Returns true for parts of the PGD that map userspace and
+ * false for the parts that map the kernel.
+ */
+static inline bool pgdp_maps_userspace(void *__ptr)
+{
+	unsigned long ptr = (unsigned long)__ptr;
+
+	return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < KERNEL_PGD_BOUNDARY);
+}
+
+static inline int pgd_large(pgd_t pgd) { return 0; }
+
 #ifdef CONFIG_PAGE_TABLE_ISOLATION
 /*
  * All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h
index 58d7f10e937d..3c5a73c8bb50 100644
--- a/arch/x86/include/asm/pgtable_64.h
+++ b/arch/x86/include/asm/pgtable_64.h
@@ -131,20 +131,6 @@ static inline pud_t native_pudp_get_and_clear(pud_t *xp)
 #endif
 }
 
-/*
- * Page table pages are page-aligned.  The lower half of the top
- * level is used for userspace and the top half for the kernel.
- *
- * Returns true for parts of the PGD that map userspace and
- * false for the parts that map the kernel.
- */
-static inline bool pgdp_maps_userspace(void *__ptr)
-{
-	unsigned long ptr = (unsigned long)__ptr;
-
-	return (ptr & ~PAGE_MASK) < (PAGE_SIZE / 2);
-}
-
 #ifdef CONFIG_PAGE_TABLE_ISOLATION
 pgd_t __pti_set_user_pgd(pgd_t *pgdp, pgd_t pgd);
 
@@ -208,7 +194,6 @@ extern void sync_global_pgds(unsigned long start, unsigned long end);
 /*
  * Level 4 access.
  */
-static inline int pgd_large(pgd_t pgd) { return 0; }
 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
 
 /* PUD - Level3 access */
-- 
2.13.6