diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2018-02-14 14:16:51 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-14 13:11:14 +0100 |
| commit | e626e6bb0dfaca41487241d49ce0ae827716101a (patch) | |
| tree | e1df3c591a7ee34d68d5e53be47310f08d6c4e98 /arch | |
| parent | eedb92abb9bb03ef21442614a6f5867eaac6e77f (diff) | |
x86/mm: Introduce 'pgtable_l5_enabled'
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/boot/compressed/kaslr.c | 4 | ||||
| -rw-r--r-- | arch/x86/include/asm/pgtable_32_types.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/pgtable_64_types.h | 6 | ||||
| -rw-r--r-- | arch/x86/kernel/head64.c | 5 |
4 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c index 8199a6187251..bd69e1830fbe 100644 --- a/arch/x86/boot/compressed/kaslr.c +++ b/arch/x86/boot/compressed/kaslr.c @@ -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. */ diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h index 0777e18a1d23..e3225e83db7d 100644 --- a/arch/x86/include/asm/pgtable_32_types.h +++ b/arch/x86/include/asm/pgtable_32_types.h @@ -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)) diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h index a0db91ab63b8..5e2d724f8f47 100644 --- a/arch/x86/include/asm/pgtable_64_types.h +++ b/arch/x86/include/asm/pgtable_64_types.h @@ -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 diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index bf5c9ba63ba1..17d00d1886de 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -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); |