NEWS: mention zero detection for non-shared-storage migration

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>

diff --git a/NEWS.rst b/NEWS.rst
index dd9f261933f647b9e65e8e490e469f10846ee918..f9a0d11896207a9fe900a286d065acb4bd701ab4 100644 (file)
--- a/NEWS.rst
+++ b/NEWS.rst
@@ -17,6 +17,17 @@ v10.9.0 (unreleased)
 
 * **New features**
 
+  * qemu: zero block detection for non-shared-storage migration
+
+    Users can now request that all-zero blocks are not transferred when migrating
+    non-shared disk data without actually enabling zero detection on the disk
+    itself. This allows sparsifying images during migration where the source
+    has no access to the allocation state of blocks at the cost of CPU overhead.
+
+    This feature is available via the ``--migrate-disks-detect-zeroes`` option
+    for ``virsh migrate`` or ``VIR_MIGRATE_PARAM_MIGRATE_DISKS_DETECT_ZEROES_ZEROES``
+    migration parameter. See the documentation for caveats.
+
 * **Improvements**
 
   * qemu: internal snapshot improvements