[xen staging] changelog: Add notes about CET and Migration changes

[patchbot@xxxxxxx]

commit 88cfd062e8318dfeb67c7d2eb50b6cd224b0738a
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Jun 26 15:35:27 2020 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Fri Jun 26 16:34:02 2020 +0100

    changelog: Add notes about CET and Migration changes
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Paul Durrant <paul@xxxxxxx>
    Release-acked-by: Paul Durrant <paul@xxxxxxx>
---
 CHANGELOG.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 43fd260156..5c3d3c791d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,15 @@ The format is based on [Keep a 
Changelog](https://keepachangelog.com/en/1.0.0/)
  - New 'domid_policy', allowing domain-ids to be randomly chosen.
  - Option to preserve domain-id across migrate or save+restore.
  - Support in kdd for initial KD protocol handshake for Win 7, 8 and 10 (64 
bit).
+ - Tech preview support for Control-flow Execution Technology, with Xen using
+   Supervisor Shadow Stacks for its own protection.
+
+### Changed
+ - The CPUID data seen by a guest on boot is now moved in the migration
+   stream.  A guest migrating between non-identical hardware will now no
+   longer observe details such as Family/Model/Stepping, Cache, etc changing.
+   An administrator still needs to take care to ensure the features visible to
+   the guest at boot are compatible with anywhere it might migrate.
 
 ## 
[4.13.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.13.0) 
- 2019-12-17
 
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