migration-guides/release-notes-5.3: using runqemu with compressed images

In OE-core commits:
* b5f8c3e029 (selftest: runqemu: add tests for booting zst compressed image, 2025-07-31)
* e069fe2480 (runqemu: Add support for running compressed .zst rootfs images, 2025-07-31)
runqemu gained the ability to run compressed image (+associated test).

Add this information to the release-notes for 5.3.

(From yocto-docs rev: f268c1b649227d533d02e1a6df797b784fcf80de)

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/documentation/migration-guides/release-notes-5.3.rst b/documentation/migration-guides/release-notes-5.3.rst
index 0ff3883bf0..417087e352 100644
--- a/documentation/migration-guides/release-notes-5.3.rst
+++ b/documentation/migration-guides/release-notes-5.3.rst
@@ -330,6 +330,11 @@ New Features / Enhancements in |yocto-ver|
       machine's CPU must also be recent enough to support these instructions
       natively.
 
+   -  ``runqemu`` can now run compressed images with snapshot mode. For example,
+      with ``IMAGE_FSTYPES = "... ext4.zst ..."``, you can run::
+
+         runqemu snapshot ext4.zst <image-recipe>
+
 -  Documentation changes:
 
    -  Part of :term:`BitBake` internals are now documented at
@@ -445,6 +450,8 @@ New Features / Enhancements in |yocto-ver|
 
       -  ``context.py``: use :term:`TEST_SUITES` if set.
 
+      - ``runqemu``: add new test for booting compressed images.
+
    -  :ref:`ref-classes-testexport`: capture all tests and data from all layers
       (instead of the :term:`OpenEmbedded-Core (OE-Core)` layer only).