v3: https://lists.gnu.org/archive/html/qemu-devel/2018-10/msg01087.html

Changes since v3:

- Add R-b's

- Add comment to copy_tlb_helper_locked to note that it can
  only be called from the TLB owner thread.

The series is checkpatch-clean. You can fetch it from:
  https://github.com/cota/qemu/tree/tlb-lock-v4

Thanks,

		Emilio