Document some of the relevant changes during the 4.16 release cycle.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Release-Acked-by: Ian Jackson <iwj@xenproject.org>
---
Changes since v3:
 - Remove a duplicated line about not building qemu-trad and pv-grub.

Changes since v2:
 - Reword the x86 page table API change.

Changes since v1:
 - Add qemu-traditional and pvgrub notes.
 - Expand vPMU support to note it's limited.
 - xenstore library API changes.
 - xencall2L addition.
 - gitlab CI changes.
 - dom0less improvements.
 - vGIC fixes.
 - New Arm features.
 - OP-TEE fixes.
 - Arm64 heterogeneous CPU support.
---
Cc: Alistair Francis <alistair.francis@wdc.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Anthony PERARD <anthony.perard@citrix.com>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Bertrand Marquis <bertrand.marquis@arm.com>
Cc: Bob Eshleman <bobbyeshleman@gmail.com>
Cc: Christian Lindig <christian.lindig@citrix.com>
Cc: Christopher Clark <christopher.w.clark@gmail.com>
Cc: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Cc: Dario Faggioli <dfaggioli@suse.com>
Cc: David Scott <dave@recoil.org>
Cc: Doug Goldstein <cardoe@cardoe.com>
Cc: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Cc: George Dunlap <george.dunlap@citrix.com>
Cc: Ian Jackson <iwj@xenproject.org>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Josh Whitehead <josh.whitehead@dornerworks.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Julien Grall <julien@xen.org>
Cc: Jun Nakajima <jun.nakajima@intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Cc: Meng Xu <mengxu@cis.upenn.edu>
Cc: Nick Rosbrook <rosbrookn@ainfosec.com>
Cc: Paul Durrant <paul@xen.org>
Cc: Quan Xu <quan.xu0@gmail.com>
Cc: Rahul Singh <rahul.singh@arm.com>
Cc: Roger Pau Monné <roger.pau@citrix.com>
Cc: Ross Lagerwall <ross.lagerwall@citrix.com>
Cc: Samuel Thibault <samuel.thibault@ens-lyon.org>
Cc: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Stewart Hildebrand <stewart.hildebrand@dornerworks.com>
Cc: Tamas K Lengyel <tamas@tklengyel.com>
Cc: Tim Deegan <tim@xen.org>
Cc: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Cc: Wei Liu <wl@xen.org>
---
 CHANGELOG.md | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ad1a8c2bc2..1fe52da7db 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,31 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
  - qemu-traditional based device models (both, qemu-traditional and ioemu-stubdom) will
    no longer be built per default. In order to be able to use those, configure needs to
    be called with "--enable-qemu-traditional" as parameter.
+ - Fixes for credit2 scheduler stability in corner case conditions.
+ - Ongoing improvements in the hypervisor build system.
+ - vtpmmgr miscellaneous fixes in preparation for TPM 2.0 support.
+ - 32bit PV guests only supported in shim mode.
+ - Improved PVH dom0 debug key handling.
+ - Fix booting on some Intel systems without a PIT (i8254).
+ - Cleanup of the xenstore library interface.
+ - Fix truncation of return value from xencall2 by introducing a new helper
+   that returns a long instead.
+ - Fix system register accesses on Arm to use the proper 32/64bit access size.
+ - Various fixes for Arm OP-TEE mediator.
+ - Switch to domheap for Xen page tables.
+
+### Added
+ - 32bit Arm builds to the gitlab-ci automated tests.
+ - x86 full system tests to the gitlab-ci automated tests.
+ - Arm limited vPMU support for guests.
+ - Static physical memory allocation for dom0less on arm64.
+ - dom0less EFI support on arm64.
+ - GICD_ICPENDR register handling in vGIC emulation to support Zephyr OS.
+ - CPU feature leveling on arm64 platform with heterogeneous cores.
+ - Report unpopulated memory regions safe to use for external mappings, Arm and
+   device tree only.
+ - Support of generic DT IOMMU bindings for Arm SMMU v2.
+ - Limit grant table version on a per-domain basis.
 
 ## [4.15.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.15.0) - 2021-04-08
 
-- 
2.33.0