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| author |   Dan Williams <dan.j.williams@intel.com> | 2018-12-04 13:37:21 -0800 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2018-12-05 09:03:06 +0100 |
| commit | 0a9fe8ca844d43f3f547f0e166122b6048121c8f (patch) | |
| tree | 2560d196ef1166c200d2be0a6509a9098b005a66 /include/asm-generic/5level-fixup.h | |
| parent | generic/pgtable: Introduce set_pte_safe() (diff) | |
| download | linux-dev-0a9fe8ca844d43f3f547f0e166122b6048121c8f.tar.xz linux-dev-0a9fe8ca844d43f3f547f0e166122b6048121c8f.zip | |
x86/mm: Validate kernel_physical_mapping_init() PTE population
The usage of __flush_tlb_all() in the kernel_physical_mapping_init()
path is not necessary. In general flushing the TLB is not required when
updating an entry from the !present state. However, to give confidence
in the future removal of TLB flushing in this path, use the new
set_pte_safe() family of helpers to assert that the !present assumption
is true in this path.
[ mingo: Minor readability edits. ]
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/154395944177.32119.8524957429632012270.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/asm-generic/5level-fixup.h')
| -rw-r--r-- | include/asm-generic/5level-fixup.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asm-generic/5level-fixup.h b/include/asm-generic/5level-fixup.h index 73474bb52344..bb6cb347018c 100644 --- a/include/asm-generic/5level-fixup.h +++ b/include/asm-generic/5level-fixup.h @@ -26,6 +26,7 @@ #define p4d_clear(p4d) pgd_clear(p4d) #define p4d_val(p4d) pgd_val(p4d) #define p4d_populate(mm, p4d, pud) pgd_populate(mm, p4d, pud) +#define p4d_populate_safe(mm, p4d, pud) pgd_populate(mm, p4d, pud) #define p4d_page(p4d) pgd_page(p4d) #define p4d_page_vaddr(p4d) pgd_page_vaddr(p4d) |