block.json (16928B)
1# -*- Mode: Python -*- 2# vim: filetype=python 3 4## 5# = Block devices 6## 7 8{ 'include': 'block-core.json' } 9 10## 11# == Additional block stuff (VM related) 12## 13 14## 15# @BiosAtaTranslation: 16# 17# Policy that BIOS should use to interpret cylinder/head/sector 18# addresses. Note that Bochs BIOS and SeaBIOS will not actually 19# translate logical CHS to physical; instead, they will use logical 20# block addressing. 21# 22# @auto: If cylinder/heads/sizes are passed, choose between none and LBA 23# depending on the size of the disk. If they are not passed, 24# choose none if QEMU can guess that the disk had 16 or fewer 25# heads, large if QEMU can guess that the disk had 131072 or 26# fewer tracks across all heads (i.e. cylinders*heads<131072), 27# otherwise LBA. 28# 29# @none: The physical disk geometry is equal to the logical geometry. 30# 31# @lba: Assume 63 sectors per track and one of 16, 32, 64, 128 or 255 32# heads (if fewer than 255 are enough to cover the whole disk 33# with 1024 cylinders/head). The number of cylinders/head is 34# then computed based on the number of sectors and heads. 35# 36# @large: The number of cylinders per head is scaled down to 1024 37# by correspondingly scaling up the number of heads. 38# 39# @rechs: Same as @large, but first convert a 16-head geometry to 40# 15-head, by proportionally scaling up the number of 41# cylinders/head. 42# 43# Since: 2.0 44## 45{ 'enum': 'BiosAtaTranslation', 46 'data': ['auto', 'none', 'lba', 'large', 'rechs']} 47 48## 49# @FloppyDriveType: 50# 51# Type of Floppy drive to be emulated by the Floppy Disk Controller. 52# 53# @144: 1.44MB 3.5" drive 54# @288: 2.88MB 3.5" drive 55# @120: 1.2MB 5.25" drive 56# @none: No drive connected 57# @auto: Automatically determined by inserted media at boot 58# 59# Since: 2.6 60## 61{ 'enum': 'FloppyDriveType', 62 'data': ['144', '288', '120', 'none', 'auto']} 63 64## 65# @PRManagerInfo: 66# 67# Information about a persistent reservation manager 68# 69# @id: the identifier of the persistent reservation manager 70# 71# @connected: true if the persistent reservation manager is connected to 72# the underlying storage or helper 73# 74# Since: 3.0 75## 76{ 'struct': 'PRManagerInfo', 77 'data': {'id': 'str', 'connected': 'bool'} } 78 79## 80# @query-pr-managers: 81# 82# Returns a list of information about each persistent reservation manager. 83# 84# Returns: a list of @PRManagerInfo for each persistent reservation manager 85# 86# Since: 3.0 87## 88{ 'command': 'query-pr-managers', 'returns': ['PRManagerInfo'], 89 'allow-preconfig': true } 90 91## 92# @eject: 93# 94# Ejects the medium from a removable drive. 95# 96# @device: Block device name 97# 98# @id: The name or QOM path of the guest device (since: 2.8) 99# 100# @force: If true, eject regardless of whether the drive is locked. 101# If not specified, the default value is false. 102# 103# Features: 104# @deprecated: Member @device is deprecated. Use @id instead. 105# 106# Returns: - Nothing on success 107# - If @device is not a valid block device, DeviceNotFound 108# Notes: Ejecting a device with no media results in success 109# 110# Since: 0.14 111# 112# Example: 113# 114# -> { "execute": "eject", "arguments": { "id": "ide1-0-1" } } 115# <- { "return": {} } 116## 117{ 'command': 'eject', 118 'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] }, 119 '*id': 'str', 120 '*force': 'bool' } } 121 122## 123# @blockdev-open-tray: 124# 125# Opens a block device's tray. If there is a block driver state tree inserted as 126# a medium, it will become inaccessible to the guest (but it will remain 127# associated to the block device, so closing the tray will make it accessible 128# again). 129# 130# If the tray was already open before, this will be a no-op. 131# 132# Once the tray opens, a DEVICE_TRAY_MOVED event is emitted. There are cases in 133# which no such event will be generated, these include: 134# 135# - if the guest has locked the tray, @force is false and the guest does not 136# respond to the eject request 137# - if the BlockBackend denoted by @device does not have a guest device attached 138# to it 139# - if the guest device does not have an actual tray 140# 141# @device: Block device name 142# 143# @id: The name or QOM path of the guest device (since: 2.8) 144# 145# @force: if false (the default), an eject request will be sent to 146# the guest if it has locked the tray (and the tray will not be opened 147# immediately); if true, the tray will be opened regardless of whether 148# it is locked 149# 150# Features: 151# @deprecated: Member @device is deprecated. Use @id instead. 152# 153# Since: 2.5 154# 155# Example: 156# 157# -> { "execute": "blockdev-open-tray", 158# "arguments": { "id": "ide0-1-0" } } 159# 160# <- { "timestamp": { "seconds": 1418751016, 161# "microseconds": 716996 }, 162# "event": "DEVICE_TRAY_MOVED", 163# "data": { "device": "ide1-cd0", 164# "id": "ide0-1-0", 165# "tray-open": true } } 166# 167# <- { "return": {} } 168# 169## 170{ 'command': 'blockdev-open-tray', 171 'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] }, 172 '*id': 'str', 173 '*force': 'bool' } } 174 175## 176# @blockdev-close-tray: 177# 178# Closes a block device's tray. If there is a block driver state tree associated 179# with the block device (which is currently ejected), that tree will be loaded 180# as the medium. 181# 182# If the tray was already closed before, this will be a no-op. 183# 184# @device: Block device name 185# 186# @id: The name or QOM path of the guest device (since: 2.8) 187# 188# Features: 189# @deprecated: Member @device is deprecated. Use @id instead. 190# 191# Since: 2.5 192# 193# Example: 194# 195# -> { "execute": "blockdev-close-tray", 196# "arguments": { "id": "ide0-1-0" } } 197# 198# <- { "timestamp": { "seconds": 1418751345, 199# "microseconds": 272147 }, 200# "event": "DEVICE_TRAY_MOVED", 201# "data": { "device": "ide1-cd0", 202# "id": "ide0-1-0", 203# "tray-open": false } } 204# 205# <- { "return": {} } 206# 207## 208{ 'command': 'blockdev-close-tray', 209 'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] }, 210 '*id': 'str' } } 211 212## 213# @blockdev-remove-medium: 214# 215# Removes a medium (a block driver state tree) from a block device. That block 216# device's tray must currently be open (unless there is no attached guest 217# device). 218# 219# If the tray is open and there is no medium inserted, this will be a no-op. 220# 221# @id: The name or QOM path of the guest device 222# 223# Since: 2.12 224# 225# Example: 226# 227# -> { "execute": "blockdev-remove-medium", 228# "arguments": { "id": "ide0-1-0" } } 229# 230# <- { "error": { "class": "GenericError", 231# "desc": "Tray of device 'ide0-1-0' is not open" } } 232# 233# -> { "execute": "blockdev-open-tray", 234# "arguments": { "id": "ide0-1-0" } } 235# 236# <- { "timestamp": { "seconds": 1418751627, 237# "microseconds": 549958 }, 238# "event": "DEVICE_TRAY_MOVED", 239# "data": { "device": "ide1-cd0", 240# "id": "ide0-1-0", 241# "tray-open": true } } 242# 243# <- { "return": {} } 244# 245# -> { "execute": "blockdev-remove-medium", 246# "arguments": { "id": "ide0-1-0" } } 247# 248# <- { "return": {} } 249# 250## 251{ 'command': 'blockdev-remove-medium', 252 'data': { 'id': 'str' } } 253 254## 255# @blockdev-insert-medium: 256# 257# Inserts a medium (a block driver state tree) into a block device. That block 258# device's tray must currently be open (unless there is no attached guest 259# device) and there must be no medium inserted already. 260# 261# @id: The name or QOM path of the guest device 262# 263# @node-name: name of a node in the block driver state graph 264# 265# Since: 2.12 266# 267# Example: 268# 269# -> { "execute": "blockdev-add", 270# "arguments": { 271# "node-name": "node0", 272# "driver": "raw", 273# "file": { "driver": "file", 274# "filename": "fedora.iso" } } } 275# <- { "return": {} } 276# 277# -> { "execute": "blockdev-insert-medium", 278# "arguments": { "id": "ide0-1-0", 279# "node-name": "node0" } } 280# 281# <- { "return": {} } 282# 283## 284{ 'command': 'blockdev-insert-medium', 285 'data': { 'id': 'str', 286 'node-name': 'str'} } 287 288 289## 290# @BlockdevChangeReadOnlyMode: 291# 292# Specifies the new read-only mode of a block device subject to the 293# @blockdev-change-medium command. 294# 295# @retain: Retains the current read-only mode 296# 297# @read-only: Makes the device read-only 298# 299# @read-write: Makes the device writable 300# 301# Since: 2.3 302# 303## 304{ 'enum': 'BlockdevChangeReadOnlyMode', 305 'data': ['retain', 'read-only', 'read-write'] } 306 307 308## 309# @blockdev-change-medium: 310# 311# Changes the medium inserted into a block device by ejecting the current medium 312# and loading a new image file which is inserted as the new medium (this command 313# combines blockdev-open-tray, blockdev-remove-medium, blockdev-insert-medium 314# and blockdev-close-tray). 315# 316# @device: Block device name 317# 318# @id: The name or QOM path of the guest device 319# (since: 2.8) 320# 321# @filename: filename of the new image to be loaded 322# 323# @format: format to open the new image with (defaults to 324# the probed format) 325# 326# @read-only-mode: change the read-only mode of the device; defaults 327# to 'retain' 328# 329# Features: 330# @deprecated: Member @device is deprecated. Use @id instead. 331# 332# Since: 2.5 333# 334# Examples: 335# 336# 1. Change a removable medium 337# 338# -> { "execute": "blockdev-change-medium", 339# "arguments": { "id": "ide0-1-0", 340# "filename": "/srv/images/Fedora-12-x86_64-DVD.iso", 341# "format": "raw" } } 342# <- { "return": {} } 343# 344# 2. Load a read-only medium into a writable drive 345# 346# -> { "execute": "blockdev-change-medium", 347# "arguments": { "id": "floppyA", 348# "filename": "/srv/images/ro.img", 349# "format": "raw", 350# "read-only-mode": "retain" } } 351# 352# <- { "error": 353# { "class": "GenericError", 354# "desc": "Could not open '/srv/images/ro.img': Permission denied" } } 355# 356# -> { "execute": "blockdev-change-medium", 357# "arguments": { "id": "floppyA", 358# "filename": "/srv/images/ro.img", 359# "format": "raw", 360# "read-only-mode": "read-only" } } 361# 362# <- { "return": {} } 363# 364## 365{ 'command': 'blockdev-change-medium', 366 'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] }, 367 '*id': 'str', 368 'filename': 'str', 369 '*format': 'str', 370 '*read-only-mode': 'BlockdevChangeReadOnlyMode' } } 371 372 373## 374# @DEVICE_TRAY_MOVED: 375# 376# Emitted whenever the tray of a removable device is moved by the guest or by 377# HMP/QMP commands 378# 379# @device: Block device name. This is always present for compatibility 380# reasons, but it can be empty ("") if the image does not 381# have a device name associated. 382# 383# @id: The name or QOM path of the guest device (since 2.8) 384# 385# @tray-open: true if the tray has been opened or false if it has been closed 386# 387# Since: 1.1 388# 389# Example: 390# 391# <- { "event": "DEVICE_TRAY_MOVED", 392# "data": { "device": "ide1-cd0", 393# "id": "/machine/unattached/device[22]", 394# "tray-open": true 395# }, 396# "timestamp": { "seconds": 1265044230, "microseconds": 450486 } } 397# 398## 399{ 'event': 'DEVICE_TRAY_MOVED', 400 'data': { 'device': 'str', 'id': 'str', 'tray-open': 'bool' } } 401 402## 403# @PR_MANAGER_STATUS_CHANGED: 404# 405# Emitted whenever the connected status of a persistent reservation 406# manager changes. 407# 408# @id: The id of the PR manager object 409# 410# @connected: true if the PR manager is connected to a backend 411# 412# Since: 3.0 413# 414# Example: 415# 416# <- { "event": "PR_MANAGER_STATUS_CHANGED", 417# "data": { "id": "pr-helper0", 418# "connected": true 419# }, 420# "timestamp": { "seconds": 1519840375, "microseconds": 450486 } } 421# 422## 423{ 'event': 'PR_MANAGER_STATUS_CHANGED', 424 'data': { 'id': 'str', 'connected': 'bool' } } 425 426## 427# @block_set_io_throttle: 428# 429# Change I/O throttle limits for a block drive. 430# 431# Since QEMU 2.4, each device with I/O limits is member of a throttle 432# group. 433# 434# If two or more devices are members of the same group, the limits 435# will apply to the combined I/O of the whole group in a round-robin 436# fashion. Therefore, setting new I/O limits to a device will affect 437# the whole group. 438# 439# The name of the group can be specified using the 'group' parameter. 440# If the parameter is unset, it is assumed to be the current group of 441# that device. If it's not in any group yet, the name of the device 442# will be used as the name for its group. 443# 444# The 'group' parameter can also be used to move a device to a 445# different group. In this case the limits specified in the parameters 446# will be applied to the new group only. 447# 448# I/O limits can be disabled by setting all of them to 0. In this case 449# the device will be removed from its group and the rest of its 450# members will not be affected. The 'group' parameter is ignored. 451# 452# Returns: - Nothing on success 453# - If @device is not a valid block device, DeviceNotFound 454# 455# Since: 1.1 456# 457# Example: 458# 459# -> { "execute": "block_set_io_throttle", 460# "arguments": { "id": "virtio-blk-pci0/virtio-backend", 461# "bps": 0, 462# "bps_rd": 0, 463# "bps_wr": 0, 464# "iops": 512, 465# "iops_rd": 0, 466# "iops_wr": 0, 467# "bps_max": 0, 468# "bps_rd_max": 0, 469# "bps_wr_max": 0, 470# "iops_max": 0, 471# "iops_rd_max": 0, 472# "iops_wr_max": 0, 473# "bps_max_length": 0, 474# "iops_size": 0 } } 475# <- { "return": {} } 476# 477# -> { "execute": "block_set_io_throttle", 478# "arguments": { "id": "ide0-1-0", 479# "bps": 1000000, 480# "bps_rd": 0, 481# "bps_wr": 0, 482# "iops": 0, 483# "iops_rd": 0, 484# "iops_wr": 0, 485# "bps_max": 8000000, 486# "bps_rd_max": 0, 487# "bps_wr_max": 0, 488# "iops_max": 0, 489# "iops_rd_max": 0, 490# "iops_wr_max": 0, 491# "bps_max_length": 60, 492# "iops_size": 0 } } 493# <- { "return": {} } 494## 495{ 'command': 'block_set_io_throttle', 'boxed': true, 496 'data': 'BlockIOThrottle' } 497 498## 499# @block-latency-histogram-set: 500# 501# Manage read, write and flush latency histograms for the device. 502# 503# If only @id parameter is specified, remove all present latency histograms 504# for the device. Otherwise, add/reset some of (or all) latency histograms. 505# 506# @id: The name or QOM path of the guest device. 507# 508# @boundaries: list of interval boundary values (see description in 509# BlockLatencyHistogramInfo definition). If specified, all 510# latency histograms are removed, and empty ones created for all 511# io types with intervals corresponding to @boundaries (except for 512# io types, for which specific boundaries are set through the 513# following parameters). 514# 515# @boundaries-read: list of interval boundary values for read latency 516# histogram. If specified, old read latency histogram is 517# removed, and empty one created with intervals 518# corresponding to @boundaries-read. The parameter has higher 519# priority then @boundaries. 520# 521# @boundaries-write: list of interval boundary values for write latency 522# histogram. 523# 524# @boundaries-flush: list of interval boundary values for flush latency 525# histogram. 526# 527# Returns: error if device is not found or any boundary arrays are invalid. 528# 529# Since: 4.0 530# 531# Example: 532# set new histograms for all io types with intervals 533# [0, 10), [10, 50), [50, 100), [100, +inf): 534# 535# -> { "execute": "block-latency-histogram-set", 536# "arguments": { "id": "drive0", 537# "boundaries": [10, 50, 100] } } 538# <- { "return": {} } 539# 540# Example: 541# set new histogram only for write, other histograms will remain 542# not changed (or not created): 543# 544# -> { "execute": "block-latency-histogram-set", 545# "arguments": { "id": "drive0", 546# "boundaries-write": [10, 50, 100] } } 547# <- { "return": {} } 548# 549# Example: 550# set new histograms with the following intervals: 551# read, flush: [0, 10), [10, 50), [50, 100), [100, +inf) 552# write: [0, 1000), [1000, 5000), [5000, +inf) 553# 554# -> { "execute": "block-latency-histogram-set", 555# "arguments": { "id": "drive0", 556# "boundaries": [10, 50, 100], 557# "boundaries-write": [1000, 5000] } } 558# <- { "return": {} } 559# 560# Example: 561# remove all latency histograms: 562# 563# -> { "execute": "block-latency-histogram-set", 564# "arguments": { "id": "drive0" } } 565# <- { "return": {} } 566## 567{ 'command': 'block-latency-histogram-set', 568 'data': {'id': 'str', 569 '*boundaries': ['uint64'], 570 '*boundaries-read': ['uint64'], 571 '*boundaries-write': ['uint64'], 572 '*boundaries-flush': ['uint64'] } }