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qemu/qapi/char.json
Markus Armbruster 3218c0e91c qapi: Convert simple union ChardevBackend to flat one 
Simple unions predate flat unions.  Having both complicates the QAPI
schema language and the QAPI generator.  We haven't been using simple
unions in new code for a long time, because they are less flexible and
somewhat awkward on the wire.

To prepare for their removal, convert simple union ChardevBackend to
an equivalent flat one.  Adds some boilerplate to the schema, which is
a bit ugly, but a lot easier to maintain than the simple union
feature.

Cc: "Marc-André Lureau" <marcandre.lureau@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210917143134.412106-8-armbru@redhat.com>
[Missing conditionals added]
2021-09-27 08:23:09 +02:00

743 lines
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# -*- Mode: Python -*-
# vim: filetype=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
##
{ '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
#
# Example:
#
# -> { "execute": "query-chardev" }
# <- {
# "return": [
# {
# "label": "charchannel0",
# "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.agent,server=on",
# "frontend-open": false
# },
# {
# "label": "charmonitor",
# "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.monitor,server=on",
# "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).
# Silently ignored with server: false. This use is deprecated.
# @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.
#
# 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': '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': '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' }
##
# @ChardevQemuVDAgent:
#
# Configuration info for qemu vdagent implementation.
#
# @mouse: enable/disable mouse, default is enabled.
# @clipboard: enable/disable clipboard, default is disabled.
#
# Since: 6.1
#
##
{ 'struct': 'ChardevQemuVDAgent',
'data': { '*mouse': 'bool',
'*clipboard': 'bool' },
'base': 'ChardevCommon',
'if': 'CONFIG_SPICE_PROTOCOL' }
##
# @ChardevBackendKind:
#
# @pipe: Since 1.5
# @udp: Since 1.5
# @mux: Since 1.5
# @msmouse: Since 1.5
# @wctablet: Since 2.9
# @braille: Since 1.5
# @testdev: Since 2.2
# @stdio: Since 1.5
# @console: Since 1.5
# @spicevmc: Since 1.5
# @spiceport: Since 1.5
# @qemu-vdagent: Since 6.1
# @vc: v1.5
# @ringbuf: Since 1.6
# @memory: Since 1.5
#
# Since: 1.4
##
{ 'enum': 'ChardevBackendKind',
'data': [ 'file',
'serial',
'parallel',
'pipe',
'socket',
'udp',
'pty',
'null',
'mux',
'msmouse',
'wctablet',
'braille',
'testdev',
'stdio',
'console',
{ 'name': 'spicevmc', 'if': 'CONFIG_SPICE' },
{ 'name': 'spiceport', 'if': 'CONFIG_SPICE' },
{ 'name': 'qemu-vdagent', 'if': 'CONFIG_SPICE_PROTOCOL' },
'vc',
'ringbuf',
# next one is just for compatibility
'memory' ] }
##
# @ChardevFileWrapper:
#
# Since: 1.4
##
{ 'struct': 'ChardevFileWrapper',
'data': { 'data': 'ChardevFile' } }
##
# @ChardevHostdevWrapper:
#
# Since: 1.4
##
{ 'struct': 'ChardevHostdevWrapper',
'data': { 'data': 'ChardevHostdev' } }
##
# @ChardevSocketWrapper:
#
# Since: 1.4
##
{ 'struct': 'ChardevSocketWrapper',
'data': { 'data': 'ChardevSocket' } }
##
# @ChardevUdpWrapper:
#
# Since: 1.5
##
{ 'struct': 'ChardevUdpWrapper',
'data': { 'data': 'ChardevUdp' } }
##
# @ChardevCommonWrapper:
#
# Since: 2.6
##
{ 'struct': 'ChardevCommonWrapper',
'data': { 'data': 'ChardevCommon' } }
##
# @ChardevMuxWrapper:
#
# Since: 1.5
##
{ 'struct': 'ChardevMuxWrapper',
'data': { 'data': 'ChardevMux' } }
##
# @ChardevStdioWrapper:
#
# Since: 1.5
##
{ 'struct': 'ChardevStdioWrapper',
'data': { 'data': 'ChardevStdio' } }
##
# @ChardevSpiceChannelWrapper:
#
# Since: 1.5
##
{ 'struct': 'ChardevSpiceChannelWrapper',
'data': { 'data': 'ChardevSpiceChannel' },
'if': 'CONFIG_SPICE' }
##
# @ChardevSpicePortWrapper:
#
# Since: 1.5
##
{ 'struct': 'ChardevSpicePortWrapper',
'data': { 'data': 'ChardevSpicePort' },
'if': 'CONFIG_SPICE' }
##
# @ChardevQemuVDAgentWrapper:
#
# Since: 6.1
##
{ 'struct': 'ChardevQemuVDAgentWrapper',
'data': { 'data': 'ChardevQemuVDAgent' },
'if': 'CONFIG_SPICE_PROTOCOL' }
##
# @ChardevVCWrapper:
#
# Since: 1.5
##
{ 'struct': 'ChardevVCWrapper',
'data': { 'data': 'ChardevVC' } }
##
# @ChardevRingbufWrapper:
#
# Since: 1.5
##
{ 'struct': 'ChardevRingbufWrapper',
'data': { 'data': 'ChardevRingbuf' } }
##
# @ChardevBackend:
#
# Configuration info for the new chardev backend.
#
# Since: 1.4
##
{ 'union': 'ChardevBackend',
'base': { 'type': 'ChardevBackendKind' },
'discriminator': 'type',
'data': { 'file': 'ChardevFileWrapper',
'serial': 'ChardevHostdevWrapper',
'parallel': 'ChardevHostdevWrapper',
'pipe': 'ChardevHostdevWrapper',
'socket': 'ChardevSocketWrapper',
'udp': 'ChardevUdpWrapper',
'pty': 'ChardevCommonWrapper',
'null': 'ChardevCommonWrapper',
'mux': 'ChardevMuxWrapper',
'msmouse': 'ChardevCommonWrapper',
'wctablet': 'ChardevCommonWrapper',
'braille': 'ChardevCommonWrapper',
'testdev': 'ChardevCommonWrapper',
'stdio': 'ChardevStdioWrapper',
'console': 'ChardevCommonWrapper',
'spicevmc': { 'type': 'ChardevSpiceChannelWrapper',
'if': 'CONFIG_SPICE' },
'spiceport': { 'type': 'ChardevSpicePortWrapper',
'if': 'CONFIG_SPICE' },
'qemu-vdagent': { 'type': 'ChardevQemuVDAgentWrapper',
'if': 'CONFIG_SPICE_PROTOCOL' },
'vc': 'ChardevVCWrapper',
'ringbuf': 'ChardevRingbufWrapper',
# next one is just for compatibility
'memory': 'ChardevRingbufWrapper' } }
##
# @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
#
# Note: This event is rate-limited.
#
# 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' } }
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