[PATCH] CHANGELOG.md: Update for 4.21 release cycle

[Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>]

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
 CHANGELOG.md | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ca1b43b940..5a0902cc3e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ The format is based on [Keep a 
Changelog](https://keepachangelog.com/en/1.0.0/)
  - Debian Trixie added to CI.  Debian Bullseye retired from CI for RISC-V due
    to the baseline change.
  - Linux based device model stubdomains are now fully supported.
+ - Remove libxenctrl usage from xenstored.
 
  - On x86:
    - Restrict the cache flushing done as a result of guest physical memory map
@@ -21,6 +22,7 @@ The format is based on [Keep a 
Changelog](https://keepachangelog.com/en/1.0.0/)
    - Allow controlling the MTRR cache attribute of the Xen platform PCI device
      BAR for HVM guests, to improve performance of guests using it to map the
      grant table or foreign memory.
+   - Allow to unflatten DTs.
 
 ### Added
  - Introduce new PDX compression algorithm to cope with Intel Sierra Forest and
@@ -36,11 +38,20 @@ The format is based on [Keep a 
Changelog](https://keepachangelog.com/en/1.0.0/)
    - Support in hvmloader for new SMBIOS tables: 7 (Cache Info), 8 (Port
      Connector), 9 (System Slots), 26 (Voltage Probe), 27 (Cooling Device),
      and 28 (Temperature Probe).
+   - Basic kexec support to Mini-OS for running in PVH mode.
 
  - On Arm:
-    - Ability to enable stack protector
+    - Ability to enable stack protector.
     - GICv3.1 eSPI (Extended Shared Peripheral Interrupts) support for Xen
       and guest domains.
+    - SMMU handling for PCIe passthrough.
+    - R-Car Gen4 PCI host controller support.
+    - SCI SCMI SMC single-agent support.
+    - Initial support for MPU, R82, and R52: reaches the early boot stages.
+
+ - On RISC-V:
+    - Basic UART support and external interrupts (APLIC/IMSIC only) handling
+      for hypervisor mode.
 
 ### Removed
  - On x86:
-- 
2.51.0