Merge tag 'pull-qapi-2025-03-14' of https://repo.or.cz/qemu/armbru into staging

QAPI patches patches for 2025-03-14

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* tag 'pull-qapi-2025-03-14' of https://repo.or.cz/qemu/armbru:
  docs: enable transmogrifier for QSD and QGA
  docs: disambiguate references in qapi-domain.rst
  docs: add QAPI namespace "QMP" to qemu-qmp-ref
  docs/qapi-domain: add namespaced index support
  docs/qapi_domain: add namespace support to cross-references
  docs/qapidoc: add :namespace: option to qapi-doc directive
  docs/qapi-domain: add qapi:namespace directive
  docs/qapi-domain: add :namespace: override option
  docs/qapi_domain: add namespace support to FQN
  docs/qapi-domain: always store fully qualified name in signode
  docs/qapi_domain: isolate TYPE_CHECKING imports
  qapi/block-core: Improve x-blockdev-change documentation

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 58 insertions, 12 deletions

diff --git a/docs/devel/qapi-domain.rst b/docs/devel/qapi-domain.rst
index 1475870..a748529 100644
--- a/docs/devel/qapi-domain.rst
+++ b/docs/devel/qapi-domain.rst
@@ -385,13 +385,13 @@ Type names in references can be surrounded by brackets, like
 ``[typename]``, to indicate an array of that type.  The cross-reference
 will apply only to the type name between the brackets. For example;
 ``:qapi:type:`[Qcow2BitmapInfoFlags]``` renders to:
-:qapi:type:`[Qcow2BitmapInfoFlags]`
+:qapi:type:`[QMP:Qcow2BitmapInfoFlags]`
 
 To indicate an optional argument/member in a field list, the type name
 can be suffixed with ``?``. The cross-reference will be transformed to
 "type, Optional" with the link applying only to the type name. For
 example; ``:qapi:type:`BitmapSyncMode?``` renders to:
-:qapi:type:`BitmapSyncMode?`
+:qapi:type:`QMP:BitmapSyncMode?`
 
 
 Namespaces
@@ -400,17 +400,38 @@ Namespaces
 Mimicking the `Python domain target specification syntax
 <https://www.sphinx-doc.org/en/master/usage/domains/python.html#target-specification>`_,
 QAPI allows you to specify the fully qualified path for a data
-type. QAPI enforces globally unique names, so it's unlikely you'll need
-this specific feature, but it may be extended in the near future to
-allow referencing identically named commands and data types from
-different utilities; i.e. QEMU Storage Daemon vs QMP.
+type.
 
+* A namespace can be explicitly provided;
+  e.g. ``:qapi:type:`QMP:BitmapSyncMode``
 * A module can be explicitly provided;
-  ``:qapi:type:`block-core.BitmapSyncMode``` will render to:
-  :qapi:type:`block-core.BitmapSyncMode`
+  ``:qapi:type:`QMP:block-core.BitmapSyncMode``` will render to:
+  :qapi:type:`QMP:block-core.BitmapSyncMode`
 * If you don't want to display the "fully qualified" name, it can be
-  prefixed with a tilde; ``:qapi:type:`~block-core.BitmapSyncMode```
-  will render to: :qapi:type:`~block-core.BitmapSyncMode`
+  prefixed with a tilde; ``:qapi:type:`~QMP:block-core.BitmapSyncMode```
+  will render to: :qapi:type:`~QMP:block-core.BitmapSyncMode`
+
+
+Target resolution
+-----------------
+
+Any cross-reference to a QAPI type, whether using the ```any``` style of
+reference or the more explicit ```:qapi:any:`target``` syntax, allows
+for the presence or absence of either the namespace or module
+information.
+
+When absent, their value will be inferred from context by the presence
+of any ``qapi:namespace`` or ``qapi:module`` directives preceding the
+cross-reference.
+
+If no results are found when using the inferred values, other
+namespaces/modules will be searched as a last resort; but any explicitly
+provided values must always match in order to succeed.
+
+This allows for efficient cross-referencing with a minimum of syntax in
+the large majority of cases, but additional context or namespace markup
+may be required outside of the QAPI reference documents when linking to
+items that share a name across multiple documented QAPI schema.
 
 
 Custom link text
@@ -423,7 +444,7 @@ using the ``custom text <target>`` syntax.
 
 For example, ``:qapi:cmd:`Merge dirty bitmaps
 <block-dirty-bitmap-merge>``` will render as: :qapi:cmd:`Merge dirty
-bitmaps <block-dirty-bitmap-merge>`
+bitmaps <QMP:block-dirty-bitmap-merge>`
 
 
 Directives
@@ -464,8 +485,11 @@ removed in a future version.
 QAPI standard options
 ---------------------
 
-All QAPI directives -- *except* for module -- support these common options.
+All QAPI directives -- *except* for namespace and module -- support
+these common options.
 
+* ``:namespace: name`` -- This option allows you to override the
+  namespace association of a given definition.
 * ``:module: modname`` -- Borrowed from the Python domain, this option allows
   you to override the module association of a given definition.
 * ``:since: x.y`` -- Allows the documenting of "Since" information, which is
@@ -480,6 +504,28 @@ All QAPI directives -- *except* for module -- support these common options.
   production code.
 
 
+qapi:namespace
+--------------
+
+The ``qapi:namespace`` directive marks the start of a QAPI namespace. It
+does not take a content body, nor any options. All subsequent QAPI
+directives are associated with the most recent namespace. This affects
+the definition's "fully qualified name", allowing two different
+namespaces to create an otherwise identically named definition.
+
+This directive also influences how reference resolution works for any
+references that do not explicity specify a namespace, so this directive
+can be used to nudge references into preferring targets from within that
+namespace.
+
+Example::
+
+   .. qapi:namespace:: QMP
+
+
+This directive has no visible effect.
+
+
 qapi:module
 -----------