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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2018-02-14 21:25:36 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-02-16 12:48:47 +0300 |
| commit | 4fa5662b6b49611f11856db8be346710217473ef (patch) | |
| tree | 4866f0255ba7a62d9b427960c8341564f5d1d35b /arch/x86/kernel/head64.c | |
| parent | b16e770bfa5344f1cd4f7b4ecd7bbae25001e120 (diff) | |
| download | linux-4fa5662b6b49611f11856db8be346710217473ef.tar.xz | |
x86/mm: Initialize 'page_offset_base' at boot-time
For 4- and 5-level paging we have different 'page_offset_base'.
Let's initialize it at boot-time accordingly to machine capability.
We also have to split __PAGE_OFFSET_BASE into two constants -- for 4-
and 5-level paging.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
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/20180214182542.69302-4-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/head64.c')
| -rw-r--r-- | arch/x86/kernel/head64.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index 8a0a485524da..876d3bf2b23a 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -49,7 +49,7 @@ EXPORT_SYMBOL(ptrs_per_p4d); #endif #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT -unsigned long page_offset_base __ro_after_init = __PAGE_OFFSET_BASE; +unsigned long page_offset_base __ro_after_init = __PAGE_OFFSET_BASE_L4; EXPORT_SYMBOL(page_offset_base); unsigned long vmalloc_base __ro_after_init = __VMALLOC_BASE; EXPORT_SYMBOL(vmalloc_base); @@ -64,6 +64,11 @@ static void __head *fixup_pointer(void *ptr, unsigned long physaddr) return ptr - (void *)_text + (void *)physaddr; } +static unsigned long __head *fixup_long(void *ptr, unsigned long physaddr) +{ + return fixup_pointer(ptr, physaddr); +} + #ifdef CONFIG_X86_5LEVEL static unsigned int __head *fixup_int(void *ptr, unsigned long physaddr) { @@ -81,6 +86,7 @@ static void __head check_la57_support(unsigned long physaddr) *fixup_int(&pgtable_l5_enabled, physaddr) = 1; *fixup_int(&pgdir_shift, physaddr) = 48; *fixup_int(&ptrs_per_p4d, physaddr) = 512; + *fixup_long(&page_offset_base, physaddr) = __PAGE_OFFSET_BASE_L5; } #else static void __head check_la57_support(unsigned long physaddr) {} @@ -89,7 +95,7 @@ static void __head check_la57_support(unsigned long physaddr) {} unsigned long __head __startup_64(unsigned long physaddr, struct boot_params *bp) { - unsigned long load_delta, *p; + unsigned long load_delta; unsigned long pgtable_flags; pgdval_t *pgd; p4dval_t *p4d; @@ -196,8 +202,7 @@ unsigned long __head __startup_64(unsigned long physaddr, * Fixup phys_base - remove the memory encryption mask to obtain * the true physical address. */ - p = fixup_pointer(&phys_base, physaddr); - *p += load_delta - sme_get_me_mask(); + *fixup_long(&phys_base, physaddr) += load_delta - sme_get_me_mask(); /* Encrypt the kernel and related (if SME is active) */ sme_encrypt_kernel(bp); |