Arm security updates as of 8th February 2018

INTRODUCTION
============

This branch is based on the v4.15 release of Linux and contains arm64
mitigations against the cache speculation side-channels described at
http://www.arm.com/security-update and commonly referred to as "Spectre" and
"Meltdown". Mitigations against variant 2 are also included for the 32-bit
armv7 architecture.

LAYOUT
======

Each commit contains a subject prefix which clearly identifies the variant
which it is attempting to mitigate against:

  [Variant 1/Spectre-v1]
  [Variant 2/Spectre-v2]
  [Variant 3/Meltdown]

The commit message begins with a reference to the upstream commit ID. The
arm64 patches are targeting the v4.16 release of Linux and so the upstream
commit IDs may not appear in mainline releases prior to v4.16, although they
should still be accurate.

NOTES TO INTEGRATORS
====================

Please note that this branch is intended to be used as the basis for backport
efforts into stable and distribution kernels. It is not intended to be
integrated directly into production kernels and will consequently be frozen
when v4.16 is released after which it *WILL NOT RECEIVE FURTHER UPDATES*.

Subsequent fixes and mitigation work will be queued in the mainline kernel
and CC'd to the stable trees as per the usual kernel development process.
Integrators are advised to track these trees as closely as possible.

The patches here are intended to be specific to the arm/arm64 architectures
and therefore mitigation efforts elsewhere in the kernel (for example, in the
eBPF subsystem) are not included as part of this branch.
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