qapi: Add a 'coroutine' flag for commands

This patch adds a new 'coroutine' flag to QMP command definitions that
tells the QMP dispatcher that the command handler is safe to be run in a
coroutine.

The documentation of the new flag pretends that this flag is already
used as intended, which it isn't yet after this patch. We'll implement
this in another patch in this series.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20201005155855.256490-9-kwolf@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

8 files changed, 16 insertions, 3 deletions

diff --git a/tests/qapi-schema/meson.build b/tests/qapi-schema/meson.build
index f08c902..1f222a7 100644
--- a/tests/qapi-schema/meson.build
+++ b/tests/qapi-schema/meson.build
@@ -142,6 +142,7 @@ schemas = [
   'nested-struct-data.json',
   'nested-struct-data-invalid-dict.json',
   'non-objects.json',
+  'oob-coroutine.json',
   'oob-test.json',
   'allow-preconfig-test.json',
   'pragma-doc-required-crap.json',
diff --git a/tests/qapi-schema/oob-coroutine.err b/tests/qapi-schema/oob-coroutine.err
new file mode 100644
index 0000000..c01a499
--- /dev/null
+++ b/tests/qapi-schema/oob-coroutine.err
@@ -0,0 +1,2 @@
+oob-coroutine.json: In command 'oob-command-1':
+oob-coroutine.json:2: flags 'allow-oob' and 'coroutine' are incompatible
diff --git a/tests/qapi-schema/oob-coroutine.json b/tests/qapi-schema/oob-coroutine.json
new file mode 100644
index 0000000..0f67663
--- /dev/null
+++ b/tests/qapi-schema/oob-coroutine.json
@@ -0,0 +1,2 @@
+# Check that incompatible flags allow-oob and coroutine are rejected
+{ 'command': 'oob-command-1', 'allow-oob': true, 'coroutine': true }
diff --git a/tests/qapi-schema/oob-coroutine.out b/tests/qapi-schema/oob-coroutine.out
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/qapi-schema/oob-coroutine.out
diff --git a/tests/qapi-schema/qapi-schema-test.json b/tests/qapi-schema/qapi-schema-test.json
index 3a9f2cb..63f92ad 100644
--- a/tests/qapi-schema/qapi-schema-test.json
+++ b/tests/qapi-schema/qapi-schema-test.json
@@ -148,6 +148,7 @@
   'returns': 'UserDefTwo' }
 
 { 'command': 'cmd-success-response', 'data': {}, 'success-response': false }
+{ 'command': 'coroutine-cmd', 'data': {}, 'coroutine': true }
 
 # Returning a non-dictionary requires a name from the whitelist
 { 'command': 'guest-get-time', 'data': {'a': 'int', '*b': 'int' },
diff --git a/tests/qapi-schema/qapi-schema-test.out b/tests/qapi-schema/qapi-schema-test.out
index 891b410..8868ca0 100644
--- a/tests/qapi-schema/qapi-schema-test.out
+++ b/tests/qapi-schema/qapi-schema-test.out
@@ -203,6 +203,8 @@ command user_def_cmd2 q_obj_user_def_cmd2-arg -> UserDefTwo
     gen=True success_response=True boxed=False oob=False preconfig=False
 command cmd-success-response None -> None
     gen=True success_response=False boxed=False oob=False preconfig=False
+command coroutine-cmd None -> None
+    gen=True success_response=True boxed=False oob=False preconfig=False coroutine=True
 object q_obj_guest-get-time-arg
     member a: int optional=False
     member b: int optional=True
diff --git a/tests/qapi-schema/test-qapi.py b/tests/qapi-schema/test-qapi.py
index f396b47..e8db9d0 100755
--- a/tests/qapi-schema/test-qapi.py
+++ b/tests/qapi-schema/test-qapi.py
@@ -68,12 +68,13 @@ class QAPISchemaTestVisitor(QAPISchemaVisitor):
 
     def visit_command(self, name, info, ifcond, features,
                       arg_type, ret_type, gen, success_response, boxed,
-                      allow_oob, allow_preconfig):
+                      allow_oob, allow_preconfig, coroutine):
         print('command %s %s -> %s'
               % (name, arg_type and arg_type.name,
                  ret_type and ret_type.name))
-        print('    gen=%s success_response=%s boxed=%s oob=%s preconfig=%s'
-              % (gen, success_response, boxed, allow_oob, allow_preconfig))
+        print('    gen=%s success_response=%s boxed=%s oob=%s preconfig=%s%s'
+              % (gen, success_response, boxed, allow_oob, allow_preconfig,
+                 " coroutine=True" if coroutine else ""))
         self._print_if(ifcond)
         self._print_features(features)
 
diff --git a/tests/test-qmp-cmds.c b/tests/test-qmp-cmds.c
index 5f1b245..d3413bf 100644
--- a/tests/test-qmp-cmds.c
+++ b/tests/test-qmp-cmds.c
@@ -36,6 +36,10 @@ void qmp_cmd_success_response(Error **errp)
 {
 }
 
+void qmp_coroutine_cmd(Error **errp)
+{
+}
+
 Empty2 *qmp_user_def_cmd0(Error **errp)
 {
     return g_new0(Empty2, 1);