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Subject[PATCH 07/16] x86/mm: Move two more functions from pgtable_64.h to pgtable.h
Date
From: Joerg Roedel <jroedel@suse.de>

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@suse.de>
---
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
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