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-rw-r--r--docs/about/deprecated.rst14
1 files changed, 14 insertions, 0 deletions
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 64b8f838be..f5f111495b 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -473,3 +473,17 @@ both, older and future versions of QEMU.
 The ``blacklist`` config file option has been renamed to ``block-rpcs``
 (to be in sync with the renaming of the corresponding command line
 option).
+
+Migration
+---------
+
+``fd:`` URI when used for file migration (since 9.1)
+''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+The ``fd:`` URI can currently provide a file descriptor that
+references either a socket or a plain file. These are two different
+types of migration. In order to reduce ambiguity, the ``fd:`` URI
+usage of providing a file descriptor to a plain file has been
+deprecated in favor of explicitly using the ``file:`` URI with the
+file descriptor being passed as an ``fdset``. Refer to the ``add-fd``
+command documentation for details on the ``fdset`` usage.