]> git.baikalelectronics.ru Git - kernel.git/commit
x86/mm: Validate kernel_physical_mapping_init() PTE population
authorDan Williams <dan.j.williams@intel.com>
Tue, 4 Dec 2018 21:37:21 +0000 (13:37 -0800)
committerIngo Molnar <mingo@kernel.org>
Wed, 5 Dec 2018 08:03:06 +0000 (09:03 +0100)
commitabdfea3c68620ab6987a78c94f278ed84d3aa30c
tree2560d196ef1166c200d2be0a6509a9098b005a66
parent8b392f4ee08cbf4230c83d35e8701bc0de7ff149
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>
arch/x86/include/asm/pgalloc.h
arch/x86/mm/init_64.c
include/asm-generic/5level-fixup.h
include/asm-generic/pgtable-nop4d-hack.h
include/asm-generic/pgtable-nop4d.h
include/asm-generic/pgtable-nopud.h