block: Relax restrictions for blockdev-snapshot

[thirdparty/qemu.git] / qapi / char.json

# -*- Mode: Python -*-
#

##
# = Character devices
##

{ 'include': 'sockets.json' }

##
# @ChardevInfo:
#
# Information about a character device.
#
# @label: the label of the character device
#
# @filename: the filename of the character device
#
# @frontend-open: shows whether the frontend device attached to this backend
#                 (eg. with the chardev=... option) is in open or closed state
#                 (since 2.1)
#
# Notes: @filename is encoded using the QEMU command line character device
#        encoding.  See the QEMU man page for details.
#
# Since: 0.14.0
##
{ 'struct': 'ChardevInfo',
  'data': { 'label': 'str',
            'filename': 'str',
            'frontend-open': 'bool' } }

##
# @query-chardev:
#
# Returns information about current character devices.
#
# Returns: a list of @ChardevInfo
#
# Since: 0.14.0
#
# Example:
#
# -> { "execute": "query-chardev" }
# <- {
#       "return": [
#          {
#             "label": "charchannel0",
#             "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.agent,server",
#             "frontend-open": false
#          },
#          {
#             "label": "charmonitor",
#             "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.monitor,server",
#             "frontend-open": true
#          },
#          {
#             "label": "charserial0",
#             "filename": "pty:/dev/pts/2",
#             "frontend-open": true
#          }
#       ]
#    }
#
##
{ 'command': 'query-chardev', 'returns': ['ChardevInfo'],
  'allow-preconfig': true }

##
# @ChardevBackendInfo:
#
# Information about a character device backend
#
# @name: The backend name
#
# Since: 2.0
##
{ 'struct': 'ChardevBackendInfo', 'data': {'name': 'str'} }

##
# @query-chardev-backends:
#
# Returns information about character device backends.
#
# Returns: a list of @ChardevBackendInfo
#
# Since: 2.0
#
# Example:
#
# -> { "execute": "query-chardev-backends" }
# <- {
#       "return":[
#          {
#             "name":"udp"
#          },
#          {
#             "name":"tcp"
#          },
#          {
#             "name":"unix"
#          },
#          {
#             "name":"spiceport"
#          }
#       ]
#    }
#
##
{ 'command': 'query-chardev-backends', 'returns': ['ChardevBackendInfo'] }

##
# @DataFormat:
#
# An enumeration of data format.
#
# @utf8: Data is a UTF-8 string (RFC 3629)
#
# @base64: Data is Base64 encoded binary (RFC 3548)
#
# Since: 1.4
##
{ 'enum': 'DataFormat',
  'data': [ 'utf8', 'base64' ] }

##
# @ringbuf-write:
#
# Write to a ring buffer character device.
#
# @device: the ring buffer character device name
#
# @data: data to write
#
# @format: data encoding (default 'utf8').
#
#          - base64: data must be base64 encoded text.  Its binary
#            decoding gets written.
#          - utf8: data's UTF-8 encoding is written
#          - data itself is always Unicode regardless of format, like
#            any other string.
#
# Returns: Nothing on success
#
# Since: 1.4
#
# Example:
#
# -> { "execute": "ringbuf-write",
#      "arguments": { "device": "foo",
#                     "data": "abcdefgh",
#                     "format": "utf8" } }
# <- { "return": {} }
#
##
{ 'command': 'ringbuf-write',
  'data': { 'device': 'str',
            'data': 'str',
           '*format': 'DataFormat'} }

##
# @ringbuf-read:
#
# Read from a ring buffer character device.
#
# @device: the ring buffer character device name
#
# @size: how many bytes to read at most
#
# @format: data encoding (default 'utf8').
#
#          - base64: the data read is returned in base64 encoding.
#          - utf8: the data read is interpreted as UTF-8.
#            Bug: can screw up when the buffer contains invalid UTF-8
#            sequences, NUL characters, after the ring buffer lost
#            data, and when reading stops because the size limit is
#            reached.
#          - The return value is always Unicode regardless of format,
#            like any other string.
#
# Returns: data read from the device
#
# Since: 1.4
#
# Example:
#
# -> { "execute": "ringbuf-read",
#      "arguments": { "device": "foo",
#                     "size": 1000,
#                     "format": "utf8" } }
# <- { "return": "abcdefgh" }
#
##
{ 'command': 'ringbuf-read',
  'data': {'device': 'str', 'size': 'int', '*format': 'DataFormat'},
  'returns': 'str' }

##
# @ChardevCommon:
#
# Configuration shared across all chardev backends
#
# @logfile: The name of a logfile to save output
# @logappend: true to append instead of truncate
#             (default to false to truncate)
#
# Since: 2.6
##
{ 'struct': 'ChardevCommon',
  'data': { '*logfile': 'str',
            '*logappend': 'bool' } }

##
# @ChardevFile:
#
# Configuration info for file chardevs.
#
# @in:  The name of the input file
# @out: The name of the output file
# @append: Open the file in append mode (default false to
#          truncate) (Since 2.6)
#
# Since: 1.4
##
{ 'struct': 'ChardevFile',
  'data': { '*in': 'str',
            'out': 'str',
            '*append': 'bool' },
  'base': 'ChardevCommon' }

##
# @ChardevHostdev:
#
# Configuration info for device and pipe chardevs.
#
# @device: The name of the special file for the device,
#          i.e. /dev/ttyS0 on Unix or COM1: on Windows
#
# Since: 1.4
##
{ 'struct': 'ChardevHostdev',
  'data': { 'device': 'str' },
  'base': 'ChardevCommon' }

##
# @ChardevSocket:
#
# Configuration info for (stream) socket chardevs.
#
# @addr: socket address to listen on (server=true)
#        or connect to (server=false)
# @tls-creds: the ID of the TLS credentials object (since 2.6)
# @tls-authz: the ID of the QAuthZ authorization object against which
#             the client's x509 distinguished name will be validated. This
#             object is only resolved at time of use, so can be deleted
#             and recreated on the fly while the chardev server is active.
#             If missing, it will default to denying access (since 4.0)
# @server: create server socket (default: true)
# @wait: wait for incoming connection on server
#        sockets (default: false).
# @nodelay: set TCP_NODELAY socket option (default: false)
# @telnet: enable telnet protocol on server
#          sockets (default: false)
# @tn3270: enable tn3270 protocol on server
#          sockets (default: false) (Since: 2.10)
# @websocket: enable websocket protocol on server
#             sockets (default: false) (Since: 3.1)
# @reconnect: For a client socket, if a socket is disconnected,
#             then attempt a reconnect after the given number of seconds.
#             Setting this to zero disables this function. (default: 0)
#             (Since: 2.2)
#
# Since: 1.4
##
{ 'struct': 'ChardevSocket',
  'data': { 'addr': 'SocketAddressLegacy',
            '*tls-creds': 'str',
            '*tls-authz'  : 'str',
            '*server': 'bool',
            '*wait': 'bool',
            '*nodelay': 'bool',
            '*telnet': 'bool',
            '*tn3270': 'bool',
            '*websocket': 'bool',
            '*reconnect': 'int' },
  'base': 'ChardevCommon' }

##
# @ChardevUdp:
#
# Configuration info for datagram socket chardevs.
#
# @remote: remote address
# @local: local address
#
# Since: 1.5
##
{ 'struct': 'ChardevUdp',
  'data': { 'remote': 'SocketAddressLegacy',
            '*local': 'SocketAddressLegacy' },
  'base': 'ChardevCommon' }

##
# @ChardevMux:
#
# Configuration info for mux chardevs.
#
# @chardev: name of the base chardev.
#
# Since: 1.5
##
{ 'struct': 'ChardevMux',
  'data': { 'chardev': 'str' },
  'base': 'ChardevCommon' }

##
# @ChardevStdio:
#
# Configuration info for stdio chardevs.
#
# @signal: Allow signals (such as SIGINT triggered by ^C)
#          be delivered to qemu.  Default: true in -nographic mode,
#          false otherwise.
#
# Since: 1.5
##
{ 'struct': 'ChardevStdio',
  'data': { '*signal': 'bool' },
  'base': 'ChardevCommon' }


##
# @ChardevSpiceChannel:
#
# Configuration info for spice vm channel chardevs.
#
# @type: kind of channel (for example vdagent).
#
# Since: 1.5
##
{ 'struct': 'ChardevSpiceChannel',
  'data': { 'type': 'str' },
  'base': 'ChardevCommon',
  'if': 'defined(CONFIG_SPICE)' }

##
# @ChardevSpicePort:
#
# Configuration info for spice port chardevs.
#
# @fqdn: name of the channel (see docs/spice-port-fqdn.txt)
#
# Since: 1.5
##
{ 'struct': 'ChardevSpicePort',
  'data': { 'fqdn': 'str' },
  'base': 'ChardevCommon',
  'if': 'defined(CONFIG_SPICE)' }

##
# @ChardevVC:
#
# Configuration info for virtual console chardevs.
#
# @width:  console width,  in pixels
# @height: console height, in pixels
# @cols:   console width,  in chars
# @rows:   console height, in chars
#
# Since: 1.5
##
{ 'struct': 'ChardevVC',
  'data': { '*width': 'int',
            '*height': 'int',
            '*cols': 'int',
            '*rows': 'int' },
  'base': 'ChardevCommon' }

##
# @ChardevRingbuf:
#
# Configuration info for ring buffer chardevs.
#
# @size: ring buffer size, must be power of two, default is 65536
#
# Since: 1.5
##
{ 'struct': 'ChardevRingbuf',
  'data': { '*size': 'int' },
  'base': 'ChardevCommon' }

##
# @ChardevBackend:
#
# Configuration info for the new chardev backend.
#
# Since: 1.4 (testdev since 2.2, wctablet since 2.9)
##
{ 'union': 'ChardevBackend',
  'data': { 'file': 'ChardevFile',
            'serial': 'ChardevHostdev',
            'parallel': 'ChardevHostdev',
            'pipe': 'ChardevHostdev',
            'socket': 'ChardevSocket',
            'udp': 'ChardevUdp',
            'pty': 'ChardevCommon',
            'null': 'ChardevCommon',
            'mux': 'ChardevMux',
            'msmouse': 'ChardevCommon',
            'wctablet': 'ChardevCommon',
            'braille': 'ChardevCommon',
            'testdev': 'ChardevCommon',
            'stdio': 'ChardevStdio',
            'console': 'ChardevCommon',
            'spicevmc': { 'type': 'ChardevSpiceChannel',
                          'if': 'defined(CONFIG_SPICE)' },
            'spiceport': { 'type': 'ChardevSpicePort',
                           'if': 'defined(CONFIG_SPICE)' },
            'vc': 'ChardevVC',
            'ringbuf': 'ChardevRingbuf',
            # next one is just for compatibility
            'memory': 'ChardevRingbuf' } }

##
# @ChardevReturn:
#
# Return info about the chardev backend just created.
#
# @pty: name of the slave pseudoterminal device, present if
#       and only if a chardev of type 'pty' was created
#
# Since: 1.4
##
{ 'struct' : 'ChardevReturn',
  'data': { '*pty': 'str' } }

##
# @chardev-add:
#
# Add a character device backend
#
# @id: the chardev's ID, must be unique
# @backend: backend type and parameters
#
# Returns: ChardevReturn.
#
# Since: 1.4
#
# Example:
#
# -> { "execute" : "chardev-add",
#      "arguments" : { "id" : "foo",
#                      "backend" : { "type" : "null", "data" : {} } } }
# <- { "return": {} }
#
# -> { "execute" : "chardev-add",
#      "arguments" : { "id" : "bar",
#                      "backend" : { "type" : "file",
#                                    "data" : { "out" : "/tmp/bar.log" } } } }
# <- { "return": {} }
#
# -> { "execute" : "chardev-add",
#      "arguments" : { "id" : "baz",
#                      "backend" : { "type" : "pty", "data" : {} } } }
# <- { "return": { "pty" : "/dev/pty/42" } }
#
##
{ 'command': 'chardev-add',
  'data': { 'id': 'str',
            'backend': 'ChardevBackend' },
  'returns': 'ChardevReturn' }

##
# @chardev-change:
#
# Change a character device backend
#
# @id: the chardev's ID, must exist
# @backend: new backend type and parameters
#
# Returns: ChardevReturn.
#
# Since: 2.10
#
# Example:
#
# -> { "execute" : "chardev-change",
#      "arguments" : { "id" : "baz",
#                      "backend" : { "type" : "pty", "data" : {} } } }
# <- { "return": { "pty" : "/dev/pty/42" } }
#
# -> {"execute" : "chardev-change",
#     "arguments" : {
#         "id" : "charchannel2",
#         "backend" : {
#             "type" : "socket",
#             "data" : {
#                 "addr" : {
#                     "type" : "unix" ,
#                     "data" : {
#                         "path" : "/tmp/charchannel2.socket"
#                     }
#                  },
#                  "server" : true,
#                  "wait" : false }}}}
# <- {"return": {}}
#
##
{ 'command': 'chardev-change',
  'data': { 'id': 'str',
            'backend': 'ChardevBackend' },
  'returns': 'ChardevReturn' }

##
# @chardev-remove:
#
# Remove a character device backend
#
# @id: the chardev's ID, must exist and not be in use
#
# Returns: Nothing on success
#
# Since: 1.4
#
# Example:
#
# -> { "execute": "chardev-remove", "arguments": { "id" : "foo" } }
# <- { "return": {} }
#
##
{ 'command': 'chardev-remove',
  'data': { 'id': 'str' } }

##
# @chardev-send-break:
#
# Send a break to a character device
#
# @id: the chardev's ID, must exist
#
# Returns: Nothing on success
#
# Since: 2.10
#
# Example:
#
# -> { "execute": "chardev-send-break", "arguments": { "id" : "foo" } }
# <- { "return": {} }
#
##
{ 'command': 'chardev-send-break',
  'data': { 'id': 'str' } }

##
# @VSERPORT_CHANGE:
#
# Emitted when the guest opens or closes a virtio-serial port.
#
# @id: device identifier of the virtio-serial port
#
# @open: true if the guest has opened the virtio-serial port
#
# Since: 2.1
#
# Example:
#
# <- { "event": "VSERPORT_CHANGE",
#      "data": { "id": "channel0", "open": true },
#      "timestamp": { "seconds": 1401385907, "microseconds": 422329 } }
#
##
{ 'event': 'VSERPORT_CHANGE',
  'data': { 'id': 'str',
            'open': 'bool' } }