path: root/qapi/qom.json

# -*- Mode: Python -*-
# vim: filetype=python
#
# This work is licensed under the terms of the GNU GPL, version 2 or later.
# See the COPYING file in the top-level directory.

##
# = QEMU Object Model (QOM)
##

##
# @ObjectPropertyInfo:
#
# @name: the name of the property
#
# @type: the type of the property.  This will typically come in one of four
#        forms:
#
#        1) A primitive type such as 'u8', 'u16', 'bool', 'str', or 'double'.
#           These types are mapped to the appropriate JSON type.
#
#        2) A child type in the form 'child<subtype>' where subtype is a qdev
#           device type name.  Child properties create the composition tree.
#
#        3) A link type in the form 'link<subtype>' where subtype is a qdev
#           device type name.  Link properties form the device model graph.
#
# @description: if specified, the description of the property.
#
# @default-value: the default value, if any (since 5.0)
#
# Since: 1.2
##
{ 'struct': 'ObjectPropertyInfo',
  'data': { 'name': 'str',
            'type': 'str',
            '*description': 'str',
            '*default-value': 'any' } }

##
# @qom-list:
#
# This command will list any properties of a object given a path in the object
# model.
#
# @path: the path within the object model.  See @qom-get for a description of
#        this parameter.
#
# Returns: a list of @ObjectPropertyInfo that describe the properties of the
#          object.
#
# Since: 1.2
#
# Example:
#
# -> { "execute": "qom-list",
#      "arguments": { "path": "/chardevs" } }
# <- { "return": [ { "name": "type", "type": "string" },
#                  { "name": "parallel0", "type": "child<chardev-vc>" },
#                  { "name": "serial0", "type": "child<chardev-vc>" },
#                  { "name": "mon0", "type": "child<chardev-stdio>" } ] }
#
##
{ 'command': 'qom-list',
  'data': { 'path': 'str' },
  'returns': [ 'ObjectPropertyInfo' ],
  'allow-preconfig': true }

##
# @qom-get:
#
# This command will get a property from a object model path and return the
# value.
#
# @path: The path within the object model.  There are two forms of supported
#        paths--absolute and partial paths.
#
#        Absolute paths are derived from the root object and can follow child<>
#        or link<> properties.  Since they can follow link<> properties, they
#        can be arbitrarily long.  Absolute paths look like absolute filenames
#        and are prefixed  with a leading slash.
#
#        Partial paths look like relative filenames.  They do not begin
#        with a prefix.  The matching rules for partial paths are subtle but
#        designed to make specifying objects easy.  At each level of the
#        composition tree, the partial path is matched as an absolute path.
#        The first match is not returned.  At least two matches are searched
#        for.  A successful result is only returned if only one match is
#        found.  If more than one match is found, a flag is return to
#        indicate that the match was ambiguous.
#
# @property: The property name to read
#
# Returns: The property value.  The type depends on the property
#          type. child<> and link<> properties are returned as #str
#          pathnames.  All integer property types (u8, u16, etc) are
#          returned as #int.
#
# Since: 1.2
#
# Example:
#
# 1. Use absolute path
#
# -> { "execute": "qom-get",
#      "arguments": { "path": "/machine/unattached/device[0]",
#                     "property": "hotplugged" } }
# <- { "return": false }
#
# 2. Use partial path
#
# -> { "execute": "qom-get",
#      "arguments": { "path": "unattached/sysbus",
#                     "property": "type" } }
# <- { "return": "System" }
#
##
{ 'command': 'qom-get',
  'data': { 'path': 'str', 'property': 'str' },
  'returns': 'any',
  'allow-preconfig': true }

##
# @qom-set:
#
# This command will set a property from a object model path.
#
# @path: see @qom-get for a description of this parameter
#
# @property: the property name to set
#
# @value: a value who's type is appropriate for the property type.  See @qom-get
#         for a description of type mapping.
#
# Since: 1.2
#
# Example:
#
# -> { "execute": "qom-set",
#      "arguments": { "path": "/machine",
#                     "property": "graphics",
#                     "value": false } }
# <- { "return": {} }
#
##
{ 'command': 'qom-set',
  'data': { 'path': 'str', 'property': 'str', 'value': 'any' },
  'allow-preconfig': true }

##
# @ObjectTypeInfo:
#
# This structure describes a search result from @qom-list-types
#
# @name: the type name found in the search
#
# @abstract: the type is abstract and can't be directly instantiated.
#            Omitted if false. (since 2.10)
#
# @parent: Name of parent type, if any (since 2.10)
#
# Since: 1.1
##
{ 'struct': 'ObjectTypeInfo',
  'data': { 'name': 'str', '*abstract': 'bool', '*parent': 'str' } }

##
# @qom-list-types:
#
# This command will return a list of types given search parameters
#
# @implements: if specified, only return types that implement this type name
#
# @abstract: if true, include abstract types in the results
#
# Returns: a list of @ObjectTypeInfo or an empty list if no results are found
#
# Since: 1.1
##
{ 'command': 'qom-list-types',
  'data': { '*implements': 'str', '*abstract': 'bool' },
  'returns': [ 'ObjectTypeInfo' ],
  'allow-preconfig': true }

##
# @qom-list-properties:
#
# List properties associated with a QOM object.
#
# @typename: the type name of an object
#
# Note: objects can create properties at runtime, for example to describe
#       links between different devices and/or objects. These properties
#       are not included in the output of this command.
#
# Returns: a list of ObjectPropertyInfo describing object properties
#
# Since: 2.12
##
{ 'command': 'qom-list-properties',
  'data': { 'typename': 'str'},
  'returns': [ 'ObjectPropertyInfo' ],
  'allow-preconfig': true }

##
# @IothreadProperties:
#
# Properties for iothread objects.
#
# @poll-max-ns: the maximum number of nanoseconds to busy wait for events.
#               0 means polling is disabled (default: 32768 on POSIX hosts,
#               0 otherwise)
#
# @poll-grow: the multiplier used to increase the polling time when the
#             algorithm detects it is missing events due to not polling long
#             enough. 0 selects a default behaviour (default: 0)
#
# @poll-shrink: the divisor used to decrease the polling time when the
#               algorithm detects it is spending too long polling without
#               encountering events. 0 selects a default behaviour (default: 0)
#
# Since: 2.0
##
{ 'struct': 'IothreadProperties',
  'data': { '*poll-max-ns': 'int',
            '*poll-grow': 'int',
            '*poll-shrink': 'int' } }

##
# @ObjectType:
#
# Since: 6.0
##
{ 'enum': 'ObjectType',
  'data': [
    'iothread'
  ] }

##
# @ObjectOptions:
#
# Describes the options of a user creatable QOM object.
#
# @qom-type: the class name for the object to be created
#
# @id: the name of the new object
#
# Since: 6.0
##
{ 'union': 'ObjectOptions',
  'base': { 'qom-type': 'ObjectType',
            'id': 'str' },
  'discriminator': 'qom-type',
  'data': {
      'iothread':                   'IothreadProperties'
  } }

##
# @object-add:
#
# Create a QOM object.
#
# @qom-type: the class name for the object to be created
#
# @id: the name of the new object
#
# Additional arguments depend on qom-type and are passed to the backend
# unchanged.
#
# Returns: Nothing on success
#          Error if @qom-type is not a valid class name
#
# Since: 2.0
#
# Example:
#
# -> { "execute": "object-add",
#      "arguments": { "qom-type": "rng-random", "id": "rng1",
#                     "filename": "/dev/hwrng" } }
# <- { "return": {} }
#
##
{ 'command': 'object-add',
  'data': {'qom-type': 'str', 'id': 'str'},
  'gen': false } # so we can get the additional arguments

##
# @object-del:
#
# Remove a QOM object.
#
# @id: the name of the QOM object to remove
#
# Returns: Nothing on success
#          Error if @id is not a valid id for a QOM object
#
# Since: 2.0
#
# Example:
#
# -> { "execute": "object-del", "arguments": { "id": "rng1" } }
# <- { "return": {} }
#
##
{ 'command': 'object-del', 'data': {'id': 'str'} }