tree 9bb8fe373304b69fa2892b075d0ea71f10720a05
parent 330e5973bb501a6ac1a4e52aa14423876e145bfc
author Andi Kleen <ak@linux.intel.com> 1533679777 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1534347453 +0200

x86/speculation/l1tf: Make pmd/pud_mknotpresent() invert

commit 0768f91530ff46683e0b372df14fd79fe8d156e5 upstream.

Some cases in THP like:
  - MADV_FREE
  - mprotect
  - split

mark the PMD non present for temporarily to prevent races. The window for
an L1TF attack in these contexts is very small, but it wants to be fixed
for correctness sake.

Use the proper low level functions for pmd/pud_mknotpresent() to address
this.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>