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xemu/qapi/block.json
Paolo Bonzini f55ba8018c block: add more commands to preconfig mode 
Of the block device commands, those that are available outside system
emulators do not require a fully constructed machine by definition.
Allow running them before machine initialization has concluded.

Of the ones that are available inside system emulation, allow querying
the PR managers, and setting up accounting and throttling.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-14 16:50:30 +02:00

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# -*- Mode: Python -*-
# vim: filetype=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']}
##
# @PRManagerInfo:
#
# Information about a persistent reservation manager
#
# @id: the identifier of the persistent reservation manager
#
# @connected: true if the persistent reservation manager is connected to
# the underlying storage or helper
#
# Since: 3.0
##
{ 'struct': 'PRManagerInfo',
'data': {'id': 'str', 'connected': 'bool'} }
##
# @query-pr-managers:
#
# Returns a list of information about each persistent reservation manager.
#
# Returns: a list of @PRManagerInfo for each persistent reservation manager
#
# Since: 3.0
##
{ 'command': 'query-pr-managers', 'returns': ['PRManagerInfo'],
'allow-preconfig': true }
##
# @eject:
#
# Ejects the medium from a removable drive.
#
# @device: Block device name
#
# @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.
#
# Features:
# @deprecated: Member @device is deprecated. Use @id instead.
#
# 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
#
# Example:
#
# -> { "execute": "eject", "arguments": { "id": "ide1-0-1" } }
# <- { "return": {} }
##
{ 'command': 'eject',
'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] },
'*id': 'str',
'*force': 'bool' } }
##
# @blockdev-open-tray:
#
# Opens a block device's tray. If there is a block driver state tree inserted as
# a medium, it will become inaccessible to the guest (but it will remain
# associated to the block device, so closing the tray will make it accessible
# again).
#
# If the tray was already open before, this will be a no-op.
#
# Once the tray opens, a DEVICE_TRAY_MOVED event is emitted. There are cases in
# which no such event will be generated, these include:
#
# - if the guest has locked the tray, @force is false and the guest does not
# respond to the eject request
# - if the BlockBackend denoted by @device does not have a guest device attached
# to it
# - if the guest device does not have an actual tray
#
# @device: Block device name
#
# @id: The name or QOM path of the guest device (since: 2.8)
#
# @force: if false (the default), an eject request will be sent to
# the guest if it has locked the tray (and the tray will not be opened
# immediately); if true, the tray will be opened regardless of whether
# it is locked
#
# Features:
# @deprecated: Member @device is deprecated. Use @id instead.
#
# Since: 2.5
#
# Example:
#
# -> { "execute": "blockdev-open-tray",
# "arguments": { "id": "ide0-1-0" } }
#
# <- { "timestamp": { "seconds": 1418751016,
# "microseconds": 716996 },
# "event": "DEVICE_TRAY_MOVED",
# "data": { "device": "ide1-cd0",
# "id": "ide0-1-0",
# "tray-open": true } }
#
# <- { "return": {} }
#
##
{ 'command': 'blockdev-open-tray',
'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] },
'*id': 'str',
'*force': 'bool' } }
##
# @blockdev-close-tray:
#
# Closes a block device's tray. If there is a block driver state tree associated
# with the block device (which is currently ejected), that tree will be loaded
# as the medium.
#
# If the tray was already closed before, this will be a no-op.
#
# @device: Block device name
#
# @id: The name or QOM path of the guest device (since: 2.8)
#
# Features:
# @deprecated: Member @device is deprecated. Use @id instead.
#
# Since: 2.5
#
# Example:
#
# -> { "execute": "blockdev-close-tray",
# "arguments": { "id": "ide0-1-0" } }
#
# <- { "timestamp": { "seconds": 1418751345,
# "microseconds": 272147 },
# "event": "DEVICE_TRAY_MOVED",
# "data": { "device": "ide1-cd0",
# "id": "ide0-1-0",
# "tray-open": false } }
#
# <- { "return": {} }
#
##
{ 'command': 'blockdev-close-tray',
'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] },
'*id': 'str' } }
##
# @blockdev-remove-medium:
#
# Removes a medium (a block driver state tree) from a block device. That block
# device's tray must currently be open (unless there is no attached guest
# device).
#
# If the tray is open and there is no medium inserted, this will be a no-op.
#
# @id: The name or QOM path of the guest device
#
# Since: 2.12
#
# Example:
#
# -> { "execute": "blockdev-remove-medium",
# "arguments": { "id": "ide0-1-0" } }
#
# <- { "error": { "class": "GenericError",
# "desc": "Tray of device 'ide0-1-0' is not open" } }
#
# -> { "execute": "blockdev-open-tray",
# "arguments": { "id": "ide0-1-0" } }
#
# <- { "timestamp": { "seconds": 1418751627,
# "microseconds": 549958 },
# "event": "DEVICE_TRAY_MOVED",
# "data": { "device": "ide1-cd0",
# "id": "ide0-1-0",
# "tray-open": true } }
#
# <- { "return": {} }
#
# -> { "execute": "blockdev-remove-medium",
# "arguments": { "id": "ide0-1-0" } }
#
# <- { "return": {} }
#
##
{ 'command': 'blockdev-remove-medium',
'data': { 'id': 'str' } }
##
# @blockdev-insert-medium:
#
# Inserts a medium (a block driver state tree) into a block device. That block
# device's tray must currently be open (unless there is no attached guest
# device) and there must be no medium inserted already.
#
# @id: The name or QOM path of the guest device
#
# @node-name: name of a node in the block driver state graph
#
# Since: 2.12
#
# Example:
#
# -> { "execute": "blockdev-add",
# "arguments": {
# "node-name": "node0",
# "driver": "raw",
# "file": { "driver": "file",
# "filename": "fedora.iso" } } }
# <- { "return": {} }
#
# -> { "execute": "blockdev-insert-medium",
# "arguments": { "id": "ide0-1-0",
# "node-name": "node0" } }
#
# <- { "return": {} }
#
##
{ 'command': 'blockdev-insert-medium',
'data': { 'id': 'str',
'node-name': 'str'} }
##
# @BlockdevChangeReadOnlyMode:
#
# Specifies the new read-only mode of a block device subject to the
# @blockdev-change-medium command.
#
# @retain: Retains the current read-only mode
#
# @read-only: Makes the device read-only
#
# @read-write: Makes the device writable
#
# Since: 2.3
##
{ 'enum': 'BlockdevChangeReadOnlyMode',
'data': ['retain', 'read-only', 'read-write'] }
##
# @blockdev-change-medium:
#
# Changes the medium inserted into a block device by ejecting the current medium
# and loading a new image file which is inserted as the new medium (this command
# combines blockdev-open-tray, blockdev-remove-medium, blockdev-insert-medium
# and blockdev-close-tray).
#
# @device: Block device name
#
# @id: The name or QOM path of the guest device
# (since: 2.8)
#
# @filename: filename of the new image to be loaded
#
# @format: format to open the new image with (defaults to
# the probed format)
#
# @read-only-mode: change the read-only mode of the device; defaults
# to 'retain'
#
# @force: if false (the default), an eject request through blockdev-open-tray
# will be sent to the guest if it has locked the tray (and the tray
# will not be opened immediately); if true, the tray will be opened
# regardless of whether it is locked. (since 7.1)
#
# Features:
# @deprecated: Member @device is deprecated. Use @id instead.
#
# Since: 2.5
#
# Examples:
#
# 1. Change a removable medium
#
# -> { "execute": "blockdev-change-medium",
# "arguments": { "id": "ide0-1-0",
# "filename": "/srv/images/Fedora-12-x86_64-DVD.iso",
# "format": "raw" } }
# <- { "return": {} }
#
# 2. Load a read-only medium into a writable drive
#
# -> { "execute": "blockdev-change-medium",
# "arguments": { "id": "floppyA",
# "filename": "/srv/images/ro.img",
# "format": "raw",
# "read-only-mode": "retain" } }
#
# <- { "error":
# { "class": "GenericError",
# "desc": "Could not open '/srv/images/ro.img': Permission denied" } }
#
# -> { "execute": "blockdev-change-medium",
# "arguments": { "id": "floppyA",
# "filename": "/srv/images/ro.img",
# "format": "raw",
# "read-only-mode": "read-only" } }
#
# <- { "return": {} }
#
##
{ 'command': 'blockdev-change-medium',
'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] },
'*id': 'str',
'filename': 'str',
'*format': 'str',
'*force': 'bool',
'*read-only-mode': 'BlockdevChangeReadOnlyMode' } }
##
# @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' } }
##
# @PR_MANAGER_STATUS_CHANGED:
#
# Emitted whenever the connected status of a persistent reservation
# manager changes.
#
# @id: The id of the PR manager object
#
# @connected: true if the PR manager is connected to a backend
#
# Since: 3.0
#
# Example:
#
# <- { "event": "PR_MANAGER_STATUS_CHANGED",
# "data": { "id": "pr-helper0",
# "connected": true
# },
# "timestamp": { "seconds": 1519840375, "microseconds": 450486 } }
#
##
{ 'event': 'PR_MANAGER_STATUS_CHANGED',
'data': { 'id': 'str', 'connected': 'bool' } }
##
# @block_set_io_throttle:
#
# Change I/O throttle limits for a block drive.
#
# Since QEMU 2.4, each device with I/O limits is member of a throttle
# group.
#
# If two or more devices are members of the same group, the limits
# will apply to the combined I/O of the whole group in a round-robin
# fashion. Therefore, setting new I/O limits to a device will affect
# the whole group.
#
# The name of the group can be specified using the 'group' parameter.
# If the parameter is unset, it is assumed to be the current group of
# that device. If it's not in any group yet, the name of the device
# will be used as the name for its group.
#
# The 'group' parameter can also be used to move a device to a
# different group. In this case the limits specified in the parameters
# will be applied to the new group only.
#
# I/O limits can be disabled by setting all of them to 0. In this case
# the device will be removed from its group and the rest of its
# members will not be affected. The 'group' parameter is ignored.
#
# Returns: - Nothing on success
# - If @device is not a valid block device, DeviceNotFound
#
# Since: 1.1
#
# Example:
#
# -> { "execute": "block_set_io_throttle",
# "arguments": { "id": "virtio-blk-pci0/virtio-backend",
# "bps": 0,
# "bps_rd": 0,
# "bps_wr": 0,
# "iops": 512,
# "iops_rd": 0,
# "iops_wr": 0,
# "bps_max": 0,
# "bps_rd_max": 0,
# "bps_wr_max": 0,
# "iops_max": 0,
# "iops_rd_max": 0,
# "iops_wr_max": 0,
# "bps_max_length": 0,
# "iops_size": 0 } }
# <- { "return": {} }
#
# -> { "execute": "block_set_io_throttle",
# "arguments": { "id": "ide0-1-0",
# "bps": 1000000,
# "bps_rd": 0,
# "bps_wr": 0,
# "iops": 0,
# "iops_rd": 0,
# "iops_wr": 0,
# "bps_max": 8000000,
# "bps_rd_max": 0,
# "bps_wr_max": 0,
# "iops_max": 0,
# "iops_rd_max": 0,
# "iops_wr_max": 0,
# "bps_max_length": 60,
# "iops_size": 0 } }
# <- { "return": {} }
##
{ 'command': 'block_set_io_throttle', 'boxed': true,
'data': 'BlockIOThrottle',
'allow-preconfig': true }
##
# @block-latency-histogram-set:
#
# Manage read, write and flush latency histograms for the device.
#
# If only @id parameter is specified, remove all present latency histograms
# for the device. Otherwise, add/reset some of (or all) latency histograms.
#
# @id: The name or QOM path of the guest device.
#
# @boundaries: list of interval boundary values (see description in
# BlockLatencyHistogramInfo definition). If specified, all
# latency histograms are removed, and empty ones created for all
# io types with intervals corresponding to @boundaries (except for
# io types, for which specific boundaries are set through the
# following parameters).
#
# @boundaries-read: list of interval boundary values for read latency
# histogram. If specified, old read latency histogram is
# removed, and empty one created with intervals
# corresponding to @boundaries-read. The parameter has higher
# priority then @boundaries.
#
# @boundaries-write: list of interval boundary values for write latency
# histogram.
#
# @boundaries-flush: list of interval boundary values for flush latency
# histogram.
#
# Returns: error if device is not found or any boundary arrays are invalid.
#
# Since: 4.0
#
# Example:
# set new histograms for all io types with intervals
# [0, 10), [10, 50), [50, 100), [100, +inf):
#
# -> { "execute": "block-latency-histogram-set",
# "arguments": { "id": "drive0",
# "boundaries": [10, 50, 100] } }
# <- { "return": {} }
#
# Example:
# set new histogram only for write, other histograms will remain
# not changed (or not created):
#
# -> { "execute": "block-latency-histogram-set",
# "arguments": { "id": "drive0",
# "boundaries-write": [10, 50, 100] } }
# <- { "return": {} }
#
# Example:
# set new histograms with the following intervals:
# read, flush: [0, 10), [10, 50), [50, 100), [100, +inf)
# write: [0, 1000), [1000, 5000), [5000, +inf)
#
# -> { "execute": "block-latency-histogram-set",
# "arguments": { "id": "drive0",
# "boundaries": [10, 50, 100],
# "boundaries-write": [1000, 5000] } }
# <- { "return": {} }
#
# Example:
# remove all latency histograms:
#
# -> { "execute": "block-latency-histogram-set",
# "arguments": { "id": "drive0" } }
# <- { "return": {} }
##
{ 'command': 'block-latency-histogram-set',
'data': {'id': 'str',
'*boundaries': ['uint64'],
'*boundaries-read': ['uint64'],
'*boundaries-write': ['uint64'],
'*boundaries-flush': ['uint64'] },
'allow-preconfig': true }
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