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qapi: introduce new cmd option "allow-oob"

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Here "oob" stands for "Out-Of-Band".  When "allow-oob" is set, it means
the command allows out-of-band execution.

The "oob" idea is proposed by Markus Armbruster in following thread:

  https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg02057.html

This new "allow-oob" boolean will be exposed by "query-qmp-schema" as
well for command entries, so that QMP clients can know which commands
can be used in out-of-band calls. For example the command "migrate"
originally looks like:

  {"name": "migrate", "ret-type": "17", "meta-type": "command",
   "arg-type": "86"}

And it'll be changed into:

  {"name": "migrate", "ret-type": "17", "allow-oob": false,
   "meta-type": "command", "arg-type": "86"}

This patch only provides the QMP interface level changes.  It does not
contain the real out-of-band execution implementation yet.

Suggested-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20180309090006.10018-18-peterx@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[eblake: rebase on introspection done by qlit]
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Peter Xu 2018-03-09 17:00:00 +08:00 committed by Eric Blake
parent bf1e730174
commit 876c67512e
7 changed files with 38 additions and 17 deletions
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5
include/qapi/qmp/dispatch.h
View file

@ -20,8 +20,9 @@ typedef void (QmpCommandFunc)(QDict *, QObject **, Error **);
typedef enum QmpCommandOptions
{
QCO_NO_OPTIONS = 0x0,
QCO_NO_SUCCESS_RESP = 0x1,
QCO_NO_OPTIONS = 0x0,
QCO_NO_SUCCESS_RESP = (1U << 0),
QCO_ALLOW_OOB = (1U << 1),
} QmpCommandOptions;
typedef struct QmpCommand

6
qapi/introspect.json
View file

@ -259,12 +259,16 @@
#
# @ret-type: the name of the command's result type.
#
# @allow-oob: whether the command allows out-of-band execution.
# (Since: 2.12)
#
# TODO: @success-response (currently irrelevant, because it's QGA, not QMP)
#
# Since: 2.5
##
{ 'struct': 'SchemaInfoCommand',
'data': { 'arg-type': 'str', 'ret-type': 'str' } }
'data': { 'arg-type': 'str', 'ret-type': 'str',
'allow-oob': 'bool' } }
##
# @SchemaInfoEvent:

18
scripts/qapi/commands.py
View file

@ -193,10 +193,18 @@ out:
return ret
def gen_register_command(name, success_response):
options = 'QCO_NO_OPTIONS'
def gen_register_command(name, success_response, allow_oob):
options = []
if not success_response:
options = 'QCO_NO_SUCCESS_RESP'
options += ['QCO_NO_SUCCESS_RESP']
if allow_oob:
options += ['QCO_ALLOW_OOB']
if not options:
options = ['QCO_NO_OPTIONS']
options = " | ".join(options)
ret = mcgen('''
qmp_register_command(cmds, "%(name)s",
@ -268,7 +276,7 @@ void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds);
genc.add(gen_registry(self._regy, self._prefix))
def visit_command(self, name, info, arg_type, ret_type,
gen, success_response, boxed):
gen, success_response, boxed, allow_oob):
if not gen:
return
self._genh.add(gen_command_decl(name, arg_type, boxed, ret_type))
@ -277,7 +285,7 @@ void %(c_prefix)sqmp_init_marshal(QmpCommandList *cmds);
self._genc.add(gen_marshal_output(ret_type))
self._genh.add(gen_marshal_decl(name))
self._genc.add(gen_marshal(name, arg_type, boxed, ret_type))
self._regy += gen_register_command(name, success_response)
self._regy += gen_register_command(name, success_response, allow_oob)
def gen_commands(schema, output_dir, prefix):

15
scripts/qapi/common.py
View file

@ -921,7 +921,8 @@ def check_exprs(exprs):
elif 'command' in expr:
meta = 'command'
check_keys(expr_elem, 'command', [],
['data', 'returns', 'gen', 'success-response', 'boxed'])
['data', 'returns', 'gen', 'success-response',
'boxed', 'allow-oob'])
elif 'event' in expr:
meta = 'event'
check_keys(expr_elem, 'event', [], ['data', 'boxed'])
@ -1044,7 +1045,7 @@ class QAPISchemaVisitor(object):
pass
def visit_command(self, name, info, arg_type, ret_type,
gen, success_response, boxed):
gen, success_response, boxed, allow_oob):
pass
def visit_event(self, name, info, arg_type, boxed):
@ -1421,7 +1422,7 @@ class QAPISchemaAlternateType(QAPISchemaType):
class QAPISchemaCommand(QAPISchemaEntity):
def __init__(self, name, info, doc, arg_type, ret_type,
gen, success_response, boxed):
gen, success_response, boxed, allow_oob):
QAPISchemaEntity.__init__(self, name, info, doc)
assert not arg_type or isinstance(arg_type, str)
assert not ret_type or isinstance(ret_type, str)
@ -1432,6 +1433,7 @@ class QAPISchemaCommand(QAPISchemaEntity):
self.gen = gen
self.success_response = success_response
self.boxed = boxed
self.allow_oob = allow_oob
def check(self, schema):
if self._arg_type_name:
@ -1455,7 +1457,8 @@ class QAPISchemaCommand(QAPISchemaEntity):
def visit(self, visitor):
visitor.visit_command(self.name, self.info,
self.arg_type, self.ret_type,
self.gen, self.success_response, self.boxed)
self.gen, self.success_response,
self.boxed, self.allow_oob)
class QAPISchemaEvent(QAPISchemaEntity):
@ -1674,6 +1677,7 @@ class QAPISchema(object):
gen = expr.get('gen', True)
success_response = expr.get('success-response', True)
boxed = expr.get('boxed', False)
allow_oob = expr.get('allow-oob', False)
if isinstance(data, OrderedDict):
data = self._make_implicit_object_type(
name, info, doc, 'arg', self._make_members(data, info))
@ -1681,7 +1685,8 @@ class QAPISchema(object):
assert len(rets) == 1
rets = self._make_array_type(rets[0], info)
self._def_entity(QAPISchemaCommand(name, info, doc, data, rets,
gen, success_response, boxed))
gen, success_response,
boxed, allow_oob))
def _def_event(self, expr, info, doc):
name = expr['event']

2
scripts/qapi/doc.py
View file

@ -227,7 +227,7 @@ class QAPISchemaGenDocVisitor(qapi.common.QAPISchemaVisitor):
body=texi_entity(doc, 'Members')))
def visit_command(self, name, info, arg_type, ret_type,
gen, success_response, boxed):
gen, success_response, boxed, allow_oob):
doc = self.cur_doc
if boxed:
body = texi_body(doc)

7
scripts/qapi/introspect.py
View file

@ -41,6 +41,8 @@ def to_qlit(obj, level=0, suppress_first_indent=False):
ret += 'QLIT_QDICT(((QLitDictEntry[]) {\n'
ret += ',\n'.join(elts) + '\n'
ret += indent(level) + '}))'
elif isinstance(obj, bool):
ret += 'QLIT_QBOOL(%s)' % ('true' if obj else 'false')
else:
assert False # not implemented
return ret
@ -170,12 +172,13 @@ const QLitObject %(c_name)s = %(c_string)s;
for m in variants.variants]})
def visit_command(self, name, info, arg_type, ret_type,
gen, success_response, boxed):
gen, success_response, boxed, allow_oob):
arg_type = arg_type or self._schema.the_empty_object_type
ret_type = ret_type or self._schema.the_empty_object_type
self._gen_qlit(name, 'command',
{'arg-type': self._use_type(arg_type),
'ret-type': self._use_type(ret_type)})
'ret-type': self._use_type(ret_type),
'allow-oob': allow_oob})
def visit_event(self, name, info, arg_type, boxed):
arg_type = arg_type or self._schema.the_empty_object_type

2
tests/qapi-schema/test-qapi.py
View file

@ -42,7 +42,7 @@ class QAPISchemaTestVisitor(QAPISchemaVisitor):
self._print_variants(variants)
def visit_command(self, name, info, arg_type, ret_type,
gen, success_response, boxed):
gen, success_response, boxed, allow_oob):
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' % \