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x86/mm: Introduce 'pgtable_l5_enabled'

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The new flag would indicate what paging mode we are in.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20180214111656.88514-5-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2018-02-14 14:16:51 +03:00 committed by Ingo Molnar
parent eedb92abb9
commit e626e6bb0d
4 changed files with 17 additions and 0 deletions
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4
arch/x86/boot/compressed/kaslr.c
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@ -46,6 +46,10 @@
#define STATIC
#include <linux/decompress/mm.h>
#ifdef CONFIG_X86_5LEVEL
unsigned int pgtable_l5_enabled __ro_after_init = 1;
#endif
extern unsigned long get_cmd_line_ptr(void);
/* Simplified build-specific string for starting entropy. */

2
arch/x86/include/asm/pgtable_32_types.h
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@ -15,6 +15,8 @@
# include <asm/pgtable-2level_types.h>
#endif
#define pgtable_l5_enabled 0
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE - 1))

6
arch/x86/include/asm/pgtable_64_types.h
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@ -20,6 +20,12 @@ typedef unsigned long pgprotval_t;
typedef struct { pteval_t pte; } pte_t;
#ifdef CONFIG_X86_5LEVEL
extern unsigned int pgtable_l5_enabled;
#else
#define pgtable_l5_enabled 0
#endif
#endif /* !__ASSEMBLY__ */
#define SHARED_KERNEL_PMD 0

5
arch/x86/kernel/head64.c
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@ -39,6 +39,11 @@ extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD];
static unsigned int __initdata next_early_pgt;
pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
#ifdef CONFIG_X86_5LEVEL
unsigned int pgtable_l5_enabled __ro_after_init = 1;
EXPORT_SYMBOL(pgtable_l5_enabled);
#endif
#ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT
unsigned long page_offset_base __ro_after_init = __PAGE_OFFSET_BASE;
EXPORT_SYMBOL(page_offset_base);