qapi/block.json - qemu - Git at Google

 # -*- Mode: Python -*-

 ##
 # = Block devices
 ##

 { 'include': 'block-core.json' }

 ##
 # == Additional block stuff (VM related)
 ##

 ##
 # @BiosAtaTranslation:
 #
 # Policy that BIOS should use to interpret cylinder/head/sector
 # addresses.  Note that Bochs BIOS and SeaBIOS will not actually
 # translate logical CHS to physical; instead, they will use logical
 # block addressing.
 #
 # @auto: If cylinder/heads/sizes are passed, choose between none and LBA
 #        depending on the size of the disk.  If they are not passed,
 #        choose none if QEMU can guess that the disk had 16 or fewer
 #        heads, large if QEMU can guess that the disk had 131072 or
 #        fewer tracks across all heads (i.e. cylinders*heads<131072),
 #        otherwise LBA.
 #
 # @none: The physical disk geometry is equal to the logical geometry.
 #
 # @lba: Assume 63 sectors per track and one of 16, 32, 64, 128 or 255
 #       heads (if fewer than 255 are enough to cover the whole disk
 #       with 1024 cylinders/head).  The number of cylinders/head is
 #       then computed based on the number of sectors and heads.
 #
 # @large: The number of cylinders per head is scaled down to 1024
 #         by correspondingly scaling up the number of heads.
 #
 # @rechs: Same as @large, but first convert a 16-head geometry to
 #         15-head, by proportionally scaling up the number of
 #         cylinders/head.
 #
 # Since: 2.0
 ##
 { 'enum': 'BiosAtaTranslation',
   'data': ['auto', 'none', 'lba', 'large', 'rechs']}

 ##
 # @FloppyDriveType:
 #
 # Type of Floppy drive to be emulated by the Floppy Disk Controller.
 #
 # @144:  1.44MB 3.5" drive
 # @288:  2.88MB 3.5" drive
 # @120:  1.2MB 5.25" drive
 # @none: No drive connected
 # @auto: Automatically determined by inserted media at boot
 #
 # Since: 2.6
 ##
 { 'enum': 'FloppyDriveType',
   'data': ['144', '288', '120', 'none', 'auto']}

 ##
 # @BlockdevSnapshotInternal:
 #
 # @device: the device name or node-name of a root node to generate the snapshot
 #          from
 #
 # @name: the name of the internal snapshot to be created
 #
 # Notes: In transaction, if @name is empty, or any snapshot matching @name
 #        exists, the operation will fail. Only some image formats support it,
 #        for example, qcow2, rbd, and sheepdog.
 #
 # Since: 1.7
 ##
 { 'struct': 'BlockdevSnapshotInternal',
   'data': { 'device': 'str', 'name': 'str' } }

 ##
 # @blockdev-snapshot-internal-sync:
 #
 # Synchronously take an internal snapshot of a block device, when the
 # format of the image used supports it. If the name is an empty
 # string, or a snapshot with name already exists, the operation will
 # fail.
 #
 # For the arguments, see the documentation of BlockdevSnapshotInternal.
 #
 # Returns: nothing on success
 #
 #          If @device is not a valid block device, GenericError
 #
 #          If any snapshot matching @name exists, or @name is empty,
 #          GenericError
 #
 #          If the format of the image used does not support it,
 #          BlockFormatFeatureNotSupported
 #
 # Since: 1.7
 #
 # Example:
 #
 # -> { "execute": "blockdev-snapshot-internal-sync",
 #      "arguments": { "device": "ide-hd0",
 #                     "name": "snapshot0" }
 #    }
 # <- { "return": {} }
 #
 ##
 { 'command': 'blockdev-snapshot-internal-sync',
   'data': 'BlockdevSnapshotInternal' }

 ##
 # @blockdev-snapshot-delete-internal-sync:
 #
 # Synchronously delete an internal snapshot of a block device, when the format
 # of the image used support it. The snapshot is identified by name or id or
 # both. One of the name or id is required. Return SnapshotInfo for the
 # successfully deleted snapshot.
 #
 # @device: the device name or node-name of a root node to delete the snapshot
 #          from
 #
 # @id: optional the snapshot's ID to be deleted
 #
 # @name: optional the snapshot's name to be deleted
 #
 # Returns: SnapshotInfo on success
 #          If @device is not a valid block device, GenericError
 #          If snapshot not found, GenericError
 #          If the format of the image used does not support it,
 #          BlockFormatFeatureNotSupported
 #          If @id and @name are both not specified, GenericError
 #
 # Since: 1.7
 #
 # Example:
 #
 # -> { "execute": "blockdev-snapshot-delete-internal-sync",
 #      "arguments": { "device": "ide-hd0",
 #                     "name": "snapshot0" }
 #    }
 # <- { "return": {
 #                    "id": "1",
 #                    "name": "snapshot0",
 #                    "vm-state-size": 0,
 #                    "date-sec": 1000012,
 #                    "date-nsec": 10,
 #                    "vm-clock-sec": 100,
 #                    "vm-clock-nsec": 20
 #      }
 #    }
 #
 ##
 { 'command': 'blockdev-snapshot-delete-internal-sync',
   'data': { 'device': 'str', '*id': 'str', '*name': 'str'},
   'returns': 'SnapshotInfo' }

 ##
 # @eject:
 #
 # Ejects a device from a removable drive.
 #
 # @device:  Block device name (deprecated, use @id instead)
 #
 # @id:      The name or QOM path of the guest device (since: 2.8)
 #
 # @force:   If true, eject regardless of whether the drive is locked.
 #           If not specified, the default value is false.
 #
 # Returns:  Nothing on success
 #
 #           If @device is not a valid block device, DeviceNotFound
 #
 # Notes:    Ejecting a device with no media results in success
 #
 # Since: 0.14.0
 #
 # Example:
 #
 # -> { "execute": "eject", "arguments": { "id": "ide1-0-1" } }
 # <- { "return": {} }
 ##
 { 'command': 'eject',
   'data': { '*device': 'str',
             '*id': 'str',
             '*force': 'bool' } }

 ##
 # @nbd-server-start:
 #
 # Start an NBD server listening on the given host and port.  Block
 # devices can then be exported using @nbd-server-add.  The NBD
 # server will present them as named exports; for example, another
 # QEMU instance could refer to them as "nbd:HOST:PORT:exportname=NAME".
 #
 # @addr: Address on which to listen.
 # @tls-creds: (optional) ID of the TLS credentials object. Since 2.6
 #
 # Returns: error if the server is already running.
 #
 # Since: 1.3.0
 ##
 { 'command': 'nbd-server-start',
   'data': { 'addr': 'SocketAddressLegacy',
             '*tls-creds': 'str'} }

 ##
 # @nbd-server-add:
 #
 # Export a block node to QEMU's embedded NBD server.
 #
 # @device: The device name or node name of the node to be exported
 #
 # @name: Export name. If unspecified, the @device parameter is used as the
 #        export name. (Since 2.12)
 #
 # @writable: Whether clients should be able to write to the device via the
 #     NBD connection (default false).
 #
 # Returns: error if the server is not running, or export with the same name
 #          already exists.
 #
 # Since: 1.3.0
 ##
 { 'command': 'nbd-server-add',
   'data': {'device': 'str', '*name': 'str', '*writable': 'bool'} }

 ##
 # @NbdServerRemoveMode:
 #
 # Mode for removing an NBD export.
 #
 # @safe: Remove export if there are no existing connections, fail otherwise.
 #
 # @hard: Drop all connections immediately and remove export.
 #
 # Potential additional modes to be added in the future:
 #
 # hide: Just hide export from new clients, leave existing connections as is.
 #       Remove export after all clients are disconnected.
 #
 # soft: Hide export from new clients, answer with ESHUTDOWN for all further
 #       requests from existing clients.
 #
 # Since: 2.12
 ##
 {'enum': 'NbdServerRemoveMode', 'data': ['safe', 'hard']}

 ##
 # @nbd-server-remove:
 #
 # Remove NBD export by name.
 #
 # @name: Export name.
 #
 # @mode: Mode of command operation. See @NbdServerRemoveMode description.
 #        Default is 'safe'.
 #
 # Returns: error if
 #            - the server is not running
 #            - export is not found
 #            - mode is 'safe' and there are existing connections
 #
 # Since: 2.12
 ##
 { 'command': 'nbd-server-remove',
   'data': {'name': 'str', '*mode': 'NbdServerRemoveMode'} }

 ##
 # @nbd-server-stop:
 #
 # Stop QEMU's embedded NBD server, and unregister all devices previously
 # added via @nbd-server-add.
 #
 # Since: 1.3.0
 ##
 { 'command': 'nbd-server-stop' }

 ##
 # @DEVICE_TRAY_MOVED:
 #
 # Emitted whenever the tray of a removable device is moved by the guest or by
 # HMP/QMP commands
 #
 # @device: Block device name. This is always present for compatibility
 #          reasons, but it can be empty ("") if the image does not
 #          have a device name associated.
 #
 # @id: The name or QOM path of the guest device (since 2.8)
 #
 # @tray-open: true if the tray has been opened or false if it has been closed
 #
 # Since: 1.1
 #
 # Example:
 #
 # <- { "event": "DEVICE_TRAY_MOVED",
 #      "data": { "device": "ide1-cd0",
 #                "id": "/machine/unattached/device[22]",
 #                "tray-open": true
 #      },
 #      "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
 #
 ##
 { 'event': 'DEVICE_TRAY_MOVED',
   'data': { 'device': 'str', 'id': 'str', 'tray-open': 'bool' } }

 ##
 # @QuorumOpType:
 #
 # An enumeration of the quorum operation types
 #
 # @read: read operation
 #
 # @write: write operation
 #
 # @flush: flush operation
 #
 # Since: 2.6
 ##
 { 'enum': 'QuorumOpType',
   'data': [ 'read', 'write', 'flush' ] }

 ##
 # @QUORUM_FAILURE:
 #
 # Emitted by the Quorum block driver if it fails to establish a quorum
 #
 # @reference: device name if defined else node name
 #
 # @sector-num: number of the first sector of the failed read operation
 #
 # @sectors-count: failed read operation sector count
 #
 # Note: This event is rate-limited.
 #
 # Since: 2.0
 #
 # Example:
 #
 # <- { "event": "QUORUM_FAILURE",
 #      "data": { "reference": "usr1", "sector-num": 345435, "sectors-count": 5 },
 #      "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }
 #
 ##
 { 'event': 'QUORUM_FAILURE',
   'data': { 'reference': 'str', 'sector-num': 'int', 'sectors-count': 'int' } }

 ##
 # @QUORUM_REPORT_BAD:
 #
 # Emitted to report a corruption of a Quorum file
 #
 # @type: quorum operation type (Since 2.6)
 #
 # @error: error message. Only present on failure. This field
 #         contains a human-readable error message. There are no semantics other
 #         than that the block layer reported an error and clients should not
 #         try to interpret the error string.
 #
 # @node-name: the graph node name of the block driver state
 #
 # @sector-num: number of the first sector of the failed read operation
 #
 # @sectors-count: failed read operation sector count
 #
 # Note: This event is rate-limited.
 #
 # Since: 2.0
 #
 # Example:
 #
 # 1. Read operation
 #
 # { "event": "QUORUM_REPORT_BAD",
 #      "data": { "node-name": "node0", "sector-num": 345435, "sectors-count": 5,
 #                "type": "read" },
 #      "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }
 #
 # 2. Flush operation
 #
 # { "event": "QUORUM_REPORT_BAD",
 #      "data": { "node-name": "node0", "sector-num": 0, "sectors-count": 2097120,
 #                "type": "flush", "error": "Broken pipe" },
 #      "timestamp": { "seconds": 1456406829, "microseconds": 291763 } }
 #
 ##
 { 'event': 'QUORUM_REPORT_BAD',
   'data': { 'type': 'QuorumOpType', '*error': 'str', 'node-name': 'str',
             'sector-num': 'int', 'sectors-count': 'int' } }
	# -- Mode: Python --

	##
	# = Block devices
	##

	{ 'include': 'block-core.json' }

	##
	# == Additional block stuff (VM related)
	##

	##
	# @BiosAtaTranslation:
	#
	# Policy that BIOS should use to interpret cylinder/head/sector
	# addresses. Note that Bochs BIOS and SeaBIOS will not actually
	# translate logical CHS to physical; instead, they will use logical
	# block addressing.
	#
	# @auto: If cylinder/heads/sizes are passed, choose between none and LBA
	# depending on the size of the disk. If they are not passed,
	# choose none if QEMU can guess that the disk had 16 or fewer
	# heads, large if QEMU can guess that the disk had 131072 or
	# fewer tracks across all heads (i.e. cylinders*heads<131072),
	# otherwise LBA.
	#
	# @none: The physical disk geometry is equal to the logical geometry.
	#
	# @lba: Assume 63 sectors per track and one of 16, 32, 64, 128 or 255
	# heads (if fewer than 255 are enough to cover the whole disk
	# with 1024 cylinders/head). The number of cylinders/head is
	# then computed based on the number of sectors and heads.
	#
	# @large: The number of cylinders per head is scaled down to 1024
	# by correspondingly scaling up the number of heads.
	#
	# @rechs: Same as @large, but first convert a 16-head geometry to
	# 15-head, by proportionally scaling up the number of
	# cylinders/head.
	#
	# Since: 2.0
	##
	{ 'enum': 'BiosAtaTranslation',
	'data': ['auto', 'none', 'lba', 'large', 'rechs']}

	##
	# @FloppyDriveType:
	#
	# Type of Floppy drive to be emulated by the Floppy Disk Controller.
	#
	# @144: 1.44MB 3.5" drive
	# @288: 2.88MB 3.5" drive
	# @120: 1.2MB 5.25" drive
	# @none: No drive connected
	# @auto: Automatically determined by inserted media at boot
	#
	# Since: 2.6
	##
	{ 'enum': 'FloppyDriveType',
	'data': ['144', '288', '120', 'none', 'auto']}

	##
	# @BlockdevSnapshotInternal:
	#
	# @device: the device name or node-name of a root node to generate the snapshot
	# from
	#
	# @name: the name of the internal snapshot to be created
	#
	# Notes: In transaction, if @name is empty, or any snapshot matching @name
	# exists, the operation will fail. Only some image formats support it,
	# for example, qcow2, rbd, and sheepdog.
	#
	# Since: 1.7
	##
	{ 'struct': 'BlockdevSnapshotInternal',
	'data': { 'device': 'str', 'name': 'str' } }

	##
	# @blockdev-snapshot-internal-sync:
	#
	# Synchronously take an internal snapshot of a block device, when the
	# format of the image used supports it. If the name is an empty
	# string, or a snapshot with name already exists, the operation will
	# fail.
	#
	# For the arguments, see the documentation of BlockdevSnapshotInternal.
	#
	# Returns: nothing on success
	#
	# If @device is not a valid block device, GenericError
	#
	# If any snapshot matching @name exists, or @name is empty,
	# GenericError
	#
	# If the format of the image used does not support it,
	# BlockFormatFeatureNotSupported
	#
	# Since: 1.7
	#
	# Example:
	#
	# -> { "execute": "blockdev-snapshot-internal-sync",
	# "arguments": { "device": "ide-hd0",
	# "name": "snapshot0" }
	# }
	# <- { "return": {} }
	#
	##
	{ 'command': 'blockdev-snapshot-internal-sync',
	'data': 'BlockdevSnapshotInternal' }

	##
	# @blockdev-snapshot-delete-internal-sync:
	#
	# Synchronously delete an internal snapshot of a block device, when the format
	# of the image used support it. The snapshot is identified by name or id or
	# both. One of the name or id is required. Return SnapshotInfo for the
	# successfully deleted snapshot.
	#
	# @device: the device name or node-name of a root node to delete the snapshot
	# from
	#
	# @id: optional the snapshot's ID to be deleted
	#
	# @name: optional the snapshot's name to be deleted
	#
	# Returns: SnapshotInfo on success
	# If @device is not a valid block device, GenericError
	# If snapshot not found, GenericError
	# If the format of the image used does not support it,
	# BlockFormatFeatureNotSupported
	# If @id and @name are both not specified, GenericError
	#
	# Since: 1.7
	#
	# Example:
	#
	# -> { "execute": "blockdev-snapshot-delete-internal-sync",
	# "arguments": { "device": "ide-hd0",
	# "name": "snapshot0" }
	# }
	# <- { "return": {
	# "id": "1",
	# "name": "snapshot0",
	# "vm-state-size": 0,
	# "date-sec": 1000012,
	# "date-nsec": 10,
	# "vm-clock-sec": 100,
	# "vm-clock-nsec": 20
	# }
	# }
	#
	##
	{ 'command': 'blockdev-snapshot-delete-internal-sync',
	'data': { 'device': 'str', 'id': 'str', 'name': 'str'},
	'returns': 'SnapshotInfo' }

	##
	# @eject:
	#
	# Ejects a device from a removable drive.
	#
	# @device: Block device name (deprecated, use @id instead)
	#
	# @id: The name or QOM path of the guest device (since: 2.8)
	#
	# @force: If true, eject regardless of whether the drive is locked.
	# If not specified, the default value is false.
	#
	# Returns: Nothing on success
	#
	# If @device is not a valid block device, DeviceNotFound
	#
	# Notes: Ejecting a device with no media results in success
	#
	# Since: 0.14.0
	#
	# Example:
	#
	# -> { "execute": "eject", "arguments": { "id": "ide1-0-1" } }
	# <- { "return": {} }
	##
	{ 'command': 'eject',
	'data': { '*device': 'str',
	'*id': 'str',
	'*force': 'bool' } }

	##
	# @nbd-server-start:
	#
	# Start an NBD server listening on the given host and port. Block
	# devices can then be exported using @nbd-server-add. The NBD
	# server will present them as named exports; for example, another
	# QEMU instance could refer to them as "nbd:HOST:PORT:exportname=NAME".
	#
	# @addr: Address on which to listen.
	# @tls-creds: (optional) ID of the TLS credentials object. Since 2.6
	#
	# Returns: error if the server is already running.
	#
	# Since: 1.3.0
	##
	{ 'command': 'nbd-server-start',
	'data': { 'addr': 'SocketAddressLegacy',
	'*tls-creds': 'str'} }

	##
	# @nbd-server-add:
	#
	# Export a block node to QEMU's embedded NBD server.
	#
	# @device: The device name or node name of the node to be exported
	#
	# @name: Export name. If unspecified, the @device parameter is used as the
	# export name. (Since 2.12)
	#
	# @writable: Whether clients should be able to write to the device via the
	# NBD connection (default false).
	#
	# Returns: error if the server is not running, or export with the same name
	# already exists.
	#
	# Since: 1.3.0
	##
	{ 'command': 'nbd-server-add',
	'data': {'device': 'str', 'name': 'str', 'writable': 'bool'} }

	##
	# @NbdServerRemoveMode:
	#
	# Mode for removing an NBD export.
	#
	# @safe: Remove export if there are no existing connections, fail otherwise.
	#
	# @hard: Drop all connections immediately and remove export.
	#
	# Potential additional modes to be added in the future:
	#
	# hide: Just hide export from new clients, leave existing connections as is.
	# Remove export after all clients are disconnected.
	#
	# soft: Hide export from new clients, answer with ESHUTDOWN for all further
	# requests from existing clients.
	#
	# Since: 2.12
	##
	{'enum': 'NbdServerRemoveMode', 'data': ['safe', 'hard']}

	##
	# @nbd-server-remove:
	#
	# Remove NBD export by name.
	#
	# @name: Export name.
	#
	# @mode: Mode of command operation. See @NbdServerRemoveMode description.
	# Default is 'safe'.
	#
	# Returns: error if
	# - the server is not running
	# - export is not found
	# - mode is 'safe' and there are existing connections
	#
	# Since: 2.12
	##
	{ 'command': 'nbd-server-remove',
	'data': {'name': 'str', '*mode': 'NbdServerRemoveMode'} }

	##
	# @nbd-server-stop:
	#
	# Stop QEMU's embedded NBD server, and unregister all devices previously
	# added via @nbd-server-add.
	#
	# Since: 1.3.0
	##
	{ 'command': 'nbd-server-stop' }

	##
	# @DEVICE_TRAY_MOVED:
	#
	# Emitted whenever the tray of a removable device is moved by the guest or by
	# HMP/QMP commands
	#
	# @device: Block device name. This is always present for compatibility
	# reasons, but it can be empty ("") if the image does not
	# have a device name associated.
	#
	# @id: The name or QOM path of the guest device (since 2.8)
	#
	# @tray-open: true if the tray has been opened or false if it has been closed
	#
	# Since: 1.1
	#
	# Example:
	#
	# <- { "event": "DEVICE_TRAY_MOVED",
	# "data": { "device": "ide1-cd0",
	# "id": "/machine/unattached/device[22]",
	# "tray-open": true
	# },
	# "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
	#
	##
	{ 'event': 'DEVICE_TRAY_MOVED',
	'data': { 'device': 'str', 'id': 'str', 'tray-open': 'bool' } }

	##
	# @QuorumOpType:
	#
	# An enumeration of the quorum operation types
	#
	# @read: read operation
	#
	# @write: write operation
	#
	# @flush: flush operation
	#
	# Since: 2.6
	##
	{ 'enum': 'QuorumOpType',
	'data': [ 'read', 'write', 'flush' ] }

	##
	# @QUORUM_FAILURE:
	#
	# Emitted by the Quorum block driver if it fails to establish a quorum
	#
	# @reference: device name if defined else node name
	#
	# @sector-num: number of the first sector of the failed read operation
	#
	# @sectors-count: failed read operation sector count
	#
	# Note: This event is rate-limited.
	#
	# Since: 2.0
	#
	# Example:
	#
	# <- { "event": "QUORUM_FAILURE",
	# "data": { "reference": "usr1", "sector-num": 345435, "sectors-count": 5 },
	# "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }
	#
	##
	{ 'event': 'QUORUM_FAILURE',
	'data': { 'reference': 'str', 'sector-num': 'int', 'sectors-count': 'int' } }

	##
	# @QUORUM_REPORT_BAD:
	#
	# Emitted to report a corruption of a Quorum file
	#
	# @type: quorum operation type (Since 2.6)
	#
	# @error: error message. Only present on failure. This field
	# contains a human-readable error message. There are no semantics other
	# than that the block layer reported an error and clients should not
	# try to interpret the error string.
	#
	# @node-name: the graph node name of the block driver state
	#
	# @sector-num: number of the first sector of the failed read operation
	#
	# @sectors-count: failed read operation sector count
	#
	# Note: This event is rate-limited.
	#
	# Since: 2.0
	#
	# Example:
	#
	# 1. Read operation
	#
	# { "event": "QUORUM_REPORT_BAD",
	# "data": { "node-name": "node0", "sector-num": 345435, "sectors-count": 5,
	# "type": "read" },
	# "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }
	#
	# 2. Flush operation
	#
	# { "event": "QUORUM_REPORT_BAD",
	# "data": { "node-name": "node0", "sector-num": 0, "sectors-count": 2097120,
	# "type": "flush", "error": "Broken pipe" },
	# "timestamp": { "seconds": 1456406829, "microseconds": 291763 } }
	#
	##
	{ 'event': 'QUORUM_REPORT_BAD',
	'data': { 'type': 'QuorumOpType', '*error': 'str', 'node-name': 'str',
	'sector-num': 'int', 'sectors-count': 'int' } }