qmp-commands.hx

   1 HXCOMM QMP dispatch table and documentation
   2 HXCOMM Text between SQMP and EQMP is copied to the QMP documentation file and
   3 HXCOMM does not show up in the other formats.
   4
   5 SQMP
   6                         QMP Supported Commands
   7                         ----------------------
   8
   9 This document describes all commands currently supported by QMP.
  10
  11 Most of the time their usage is exactly the same as in the user Monitor, this
  12 means that any other document which also describe commands (the manpage,
  13 QEMU's manual, etc) can and should be consulted.
  14
  15 QMP has two types of commands: regular and query commands. Regular commands
  16 usually change the Virtual Machine's state someway, while query commands just
  17 return information. The sections below are divided accordingly.
  18
  19 It's important to observe that all communication examples are formatted in
  20 a reader-friendly way, so that they're easier to understand. However, in real
  21 protocol usage, they're emitted as a single line.
  22
  23 Also, the following notation is used to denote data flow:
  24
  25 -> data issued by the Client
  26 <- Server data response
  27
  28 Please, refer to the QMP specification (QMP/qmp-spec.txt) for detailed
  29 information on the Server command and response formats.
  30
  31 NOTE: This document is temporary and will be replaced soon.
  32
  33 1. Stability Considerations
  34 ===========================
  35
  36 The current QMP command set (described in this file) may be useful for a
  37 number of use cases, however it's limited and several commands have bad
  38 defined semantics, specially with regard to command completion.
  39
  40 These problems are going to be solved incrementally in the next QEMU releases
  41 and we're going to establish a deprecation policy for badly defined commands.
  42
  43 If you're planning to adopt QMP, please observe the following:
  44
  45     1. The deprecation policy will take effect and be documented soon, please
  46        check the documentation of each used command as soon as a new release of
  47        QEMU is available
  48
  49     2. DO NOT rely on anything which is not explicit documented
  50
  51     3. Errors, in special, are not documented. Applications should NOT check
  52        for specific errors classes or data (it's strongly recommended to only
  53        check for the "error" key)
  54
  55 2. Regular Commands
  56 ===================
  57
  58 Server's responses in the examples below are always a success response, please
  59 refer to the QMP specification for more details on error responses.
  60
  61 EQMP
  62
  63     {
  64         .name       = "quit",
  65         .args_type  = "",
  66         .mhandler.cmd_new = qmp_marshal_input_quit,
  67     },
  68
  69 SQMP
  70 quit
  71 ----
  72
  73 Quit the emulator.
  74
  75 Arguments: None.
  76
  77 Example:
  78
  79 -> { "execute": "quit" }
  80 <- { "return": {} }
  81
  82 EQMP
  83
  84     {
  85         .name       = "eject",
  86         .args_type  = "force:-f,device:B",
  87         .mhandler.cmd_new = qmp_marshal_input_eject,
  88     },
  89
  90 SQMP
  91 eject
  92 -----
  93
  94 Eject a removable medium.
  95
  96 Arguments:
  97
  98 - force: force ejection (json-bool, optional)
  99 - device: device name (json-string)
 100
 101 Example:
 102
 103 -> { "execute": "eject", "arguments": { "device": "ide1-cd0" } }
 104 <- { "return": {} }
 105
 106 Note: The "force" argument defaults to false.
 107
 108 EQMP
 109
 110     {
 111         .name       = "change",
 112         .args_type  = "device:B,target:F,arg:s?",
 113         .mhandler.cmd_new = qmp_marshal_input_change,
 114     },
 115
 116 SQMP
 117 change
 118 ------
 119
 120 Change a removable medium or VNC configuration.
 121
 122 Arguments:
 123
 124 - "device": device name (json-string)
 125 - "target": filename or item (json-string)
 126 - "arg": additional argument (json-string, optional)
 127
 128 Examples:
 129
 130 1. Change a removable medium
 131
 132 -> { "execute": "change",
 133              "arguments": { "device": "ide1-cd0",
 134                             "target": "/srv/images/Fedora-12-x86_64-DVD.iso" } }
 135 <- { "return": {} }
 136
 137 2. Change VNC password
 138
 139 -> { "execute": "change",
 140              "arguments": { "device": "vnc", "target": "password",
 141                             "arg": "foobar1" } }
 142 <- { "return": {} }
 143
 144 EQMP
 145
 146     {
 147         .name       = "screendump",
 148         .args_type  = "filename:F",
 149         .mhandler.cmd_new = qmp_marshal_input_screendump,
 150     },
 151
 152 SQMP
 153 screendump
 154 ----------
 155
 156 Save screen into PPM image.
 157
 158 Arguments:
 159
 160 - "filename": file path (json-string)
 161
 162 Example:
 163
 164 -> { "execute": "screendump", "arguments": { "filename": "/tmp/image" } }
 165 <- { "return": {} }
 166
 167 EQMP
 168
 169     {
 170         .name       = "stop",
 171         .args_type  = "",
 172         .mhandler.cmd_new = qmp_marshal_input_stop,
 173     },
 174
 175 SQMP
 176 stop
 177 ----
 178
 179 Stop the emulator.
 180
 181 Arguments: None.
 182
 183 Example:
 184
 185 -> { "execute": "stop" }
 186 <- { "return": {} }
 187
 188 EQMP
 189
 190     {
 191         .name       = "cont",
 192         .args_type  = "",
 193         .mhandler.cmd_new = qmp_marshal_input_cont,
 194     },
 195
 196 SQMP
 197 cont
 198 ----
 199
 200 Resume emulation.
 201
 202 Arguments: None.
 203
 204 Example:
 205
 206 -> { "execute": "cont" }
 207 <- { "return": {} }
 208
 209 EQMP
 210
 211     {
 212         .name       = "system_wakeup",
 213         .args_type  = "",
 214         .mhandler.cmd_new = qmp_marshal_input_system_wakeup,
 215     },
 216
 217 SQMP
 218 system_wakeup
 219 -------------
 220
 221 Wakeup guest from suspend.
 222
 223 Arguments: None.
 224
 225 Example:
 226
 227 -> { "execute": "system_wakeup" }
 228 <- { "return": {} }
 229
 230 EQMP
 231
 232     {
 233         .name       = "system_reset",
 234         .args_type  = "",
 235         .mhandler.cmd_new = qmp_marshal_input_system_reset,
 236     },
 237
 238 SQMP
 239 system_reset
 240 ------------
 241
 242 Reset the system.
 243
 244 Arguments: None.
 245
 246 Example:
 247
 248 -> { "execute": "system_reset" }
 249 <- { "return": {} }
 250
 251 EQMP
 252
 253     {
 254         .name       = "system_powerdown",
 255         .args_type  = "",
 256         .mhandler.cmd_new = qmp_marshal_input_system_powerdown,
 257     },
 258
 259 SQMP
 260 system_powerdown
 261 ----------------
 262
 263 Send system power down event.
 264
 265 Arguments: None.
 266
 267 Example:
 268
 269 -> { "execute": "system_powerdown" }
 270 <- { "return": {} }
 271
 272 EQMP
 273
 274     {
 275         .name       = "device_add",
 276         .args_type  = "device:O",
 277         .params     = "driver[,prop=value][,...]",
 278         .help       = "add device, like -device on the command line",
 279         .mhandler.cmd_new = do_device_add,
 280     },
 281
 282 SQMP
 283 device_add
 284 ----------
 285
 286 Add a device.
 287
 288 Arguments:
 289
 290 - "driver": the name of the new device's driver (json-string)
 291 - "bus": the device's parent bus (device tree path, json-string, optional)
 292 - "id": the device's ID, must be unique (json-string)
 293 - device properties
 294
 295 Example:
 296
 297 -> { "execute": "device_add", "arguments": { "driver": "e1000", "id": "net1" } }
 298 <- { "return": {} }
 299
 300 Notes:
 301
 302 (1) For detailed information about this command, please refer to the
 303     'docs/qdev-device-use.txt' file.
 304
 305 (2) It's possible to list device properties by running QEMU with the
 306     "-device DEVICE,\?" command-line argument, where DEVICE is the device's name
 307
 308 EQMP
 309
 310     {
 311         .name       = "device_del",
 312         .args_type  = "id:s",
 313         .mhandler.cmd_new = qmp_marshal_input_device_del,
 314     },
 315
 316 SQMP
 317 device_del
 318 ----------
 319
 320 Remove a device.
 321
 322 Arguments:
 323
 324 - "id": the device's ID (json-string)
 325
 326 Example:
 327
 328 -> { "execute": "device_del", "arguments": { "id": "net1" } }
 329 <- { "return": {} }
 330
 331 EQMP
 332
 333     {
 334         .name       = "send-key",
 335         .args_type  = "keys:q,hold-time:i?",
 336         .mhandler.cmd_new = qmp_marshal_input_send_key,
 337     },
 338
 339 SQMP
 340 send-key
 341 ----------
 342
 343 Send keys to VM.
 344
 345 Arguments:
 346
 347 keys array:
 348     - "key": key sequence (a json-array of key union values,
 349              union can be number or qcode enum)
 350
 351 - hold-time: time to delay key up events, milliseconds. Defaults to 100
 352              (json-int, optional)
 353
 354 Example:
 355
 356 -> { "execute": "send-key",
 357      "arguments": { "keys": [ { "type": "qcode", "data": "ctrl" },
 358                               { "type": "qcode", "data": "alt" },
 359                               { "type": "qcode", "data": "delete" } ] } }
 360 <- { "return": {} }
 361
 362 EQMP
 363
 364     {
 365         .name       = "cpu",
 366         .args_type  = "index:i",
 367         .mhandler.cmd_new = qmp_marshal_input_cpu,
 368     },
 369
 370 SQMP
 371 cpu
 372 ---
 373
 374 Set the default CPU.
 375
 376 Arguments:
 377
 378 - "index": the CPU's index (json-int)
 379
 380 Example:
 381
 382 -> { "execute": "cpu", "arguments": { "index": 0 } }
 383 <- { "return": {} }
 384
 385 Note: CPUs' indexes are obtained with the 'query-cpus' command.
 386
 387 EQMP
 388
 389     {
 390         .name       = "cpu-add",
 391         .args_type  = "id:i",
 392         .mhandler.cmd_new = qmp_marshal_input_cpu_add,
 393     },
 394
 395 SQMP
 396 cpu-add
 397 -------
 398
 399 Adds virtual cpu
 400
 401 Arguments:
 402
 403 - "id": cpu id (json-int)
 404
 405 Example:
 406
 407 -> { "execute": "cpu-add", "arguments": { "id": 2 } }
 408 <- { "return": {} }
 409
 410 EQMP
 411
 412     {
 413         .name       = "memsave",
 414         .args_type  = "val:l,size:i,filename:s,cpu:i?",
 415         .mhandler.cmd_new = qmp_marshal_input_memsave,
 416     },
 417
 418 SQMP
 419 memsave
 420 -------
 421
 422 Save to disk virtual memory dump starting at 'val' of size 'size'.
 423
 424 Arguments:
 425
 426 - "val": the starting address (json-int)
 427 - "size": the memory size, in bytes (json-int)
 428 - "filename": file path (json-string)
 429 - "cpu": virtual CPU index (json-int, optional)
 430
 431 Example:
 432
 433 -> { "execute": "memsave",
 434              "arguments": { "val": 10,
 435                             "size": 100,
 436                             "filename": "/tmp/virtual-mem-dump" } }
 437 <- { "return": {} }
 438
 439 EQMP
 440
 441     {
 442         .name       = "pmemsave",
 443         .args_type  = "val:l,size:i,filename:s",
 444         .mhandler.cmd_new = qmp_marshal_input_pmemsave,
 445     },
 446
 447 SQMP
 448 pmemsave
 449 --------
 450
 451 Save to disk physical memory dump starting at 'val' of size 'size'.
 452
 453 Arguments:
 454
 455 - "val": the starting address (json-int)
 456 - "size": the memory size, in bytes (json-int)
 457 - "filename": file path (json-string)
 458
 459 Example:
 460
 461 -> { "execute": "pmemsave",
 462              "arguments": { "val": 10,
 463                             "size": 100,
 464                             "filename": "/tmp/physical-mem-dump" } }
 465 <- { "return": {} }
 466
 467 EQMP
 468
 469     {
 470         .name       = "inject-nmi",
 471         .args_type  = "",
 472         .mhandler.cmd_new = qmp_marshal_input_inject_nmi,
 473     },
 474
 475 SQMP
 476 inject-nmi
 477 ----------
 478
 479 Inject an NMI on the default CPU (x86/s390) or all CPUs (ppc64).
 480
 481 Arguments: None.
 482
 483 Example:
 484
 485 -> { "execute": "inject-nmi" }
 486 <- { "return": {} }
 487
 488 Note: inject-nmi fails when the guest doesn't support injecting.
 489
 490 EQMP
 491
 492     {
 493         .name       = "ringbuf-write",
 494         .args_type  = "device:s,data:s,format:s?",
 495         .mhandler.cmd_new = qmp_marshal_input_ringbuf_write,
 496     },
 497
 498 SQMP
 499 ringbuf-write
 500 -------------
 501
 502 Write to a ring buffer character device.
 503
 504 Arguments:
 505
 506 - "device": ring buffer character device name (json-string)
 507 - "data": data to write (json-string)
 508 - "format": data format (json-string, optional)
 509           - Possible values: "utf8" (default), "base64"
 510             Bug: invalid base64 is currently not rejected.
 511             Whitespace *is* invalid.
 512
 513 Example:
 514
 515 -> { "execute": "ringbuf-write",
 516                 "arguments": { "device": "foo",
 517                                "data": "abcdefgh",
 518                                "format": "utf8" } }
 519 <- { "return": {} }
 520
 521 EQMP
 522
 523     {
 524         .name       = "ringbuf-read",
 525         .args_type  = "device:s,size:i,format:s?",
 526         .mhandler.cmd_new = qmp_marshal_input_ringbuf_read,
 527     },
 528
 529 SQMP
 530 ringbuf-read
 531 -------------
 532
 533 Read from a ring buffer character device.
 534
 535 Arguments:
 536
 537 - "device": ring buffer character device name (json-string)
 538 - "size": how many bytes to read at most (json-int)
 539           - Number of data bytes, not number of characters in encoded data
 540 - "format": data format (json-string, optional)
 541           - Possible values: "utf8" (default), "base64"
 542           - Naturally, format "utf8" works only when the ring buffer
 543             contains valid UTF-8 text.  Invalid UTF-8 sequences get
 544             replaced.  Bug: replacement doesn't work.  Bug: can screw
 545             up on encountering NUL characters, after the ring buffer
 546             lost data, and when reading stops because the size limit
 547             is reached.
 548
 549 Example:
 550
 551 -> { "execute": "ringbuf-read",
 552                 "arguments": { "device": "foo",
 553                                "size": 1000,
 554                                "format": "utf8" } }
 555 <- {"return": "abcdefgh"}
 556
 557 EQMP
 558
 559     {
 560         .name       = "xen-save-devices-state",
 561         .args_type  = "filename:F",
 562     .mhandler.cmd_new = qmp_marshal_input_xen_save_devices_state,
 563     },
 564
 565 SQMP
 566 xen-save-devices-state
 567 -------
 568
 569 Save the state of all devices to file. The RAM and the block devices
 570 of the VM are not saved by this command.
 571
 572 Arguments:
 573
 574 - "filename": the file to save the state of the devices to as binary
 575 data. See xen-save-devices-state.txt for a description of the binary
 576 format.
 577
 578 Example:
 579
 580 -> { "execute": "xen-save-devices-state",
 581      "arguments": { "filename": "/tmp/save" } }
 582 <- { "return": {} }
 583
 584 EQMP
 585
 586     {
 587         .name       = "xen-set-global-dirty-log",
 588         .args_type  = "enable:b",
 589         .mhandler.cmd_new = qmp_marshal_input_xen_set_global_dirty_log,
 590     },
 591
 592 SQMP
 593 xen-set-global-dirty-log
 594 -------
 595
 596 Enable or disable the global dirty log mode.
 597
 598 Arguments:
 599
 600 - "enable": Enable it or disable it.
 601
 602 Example:
 603
 604 -> { "execute": "xen-set-global-dirty-log",
 605      "arguments": { "enable": true } }
 606 <- { "return": {} }
 607
 608 EQMP
 609
 610     {
 611         .name       = "migrate",
 612         .args_type  = "detach:-d,blk:-b,inc:-i,uri:s",
 613         .mhandler.cmd_new = qmp_marshal_input_migrate,
 614     },
 615
 616 SQMP
 617 migrate
 618 -------
 619
 620 Migrate to URI.
 621
 622 Arguments:
 623
 624 - "blk": block migration, full disk copy (json-bool, optional)
 625 - "inc": incremental disk copy (json-bool, optional)
 626 - "uri": Destination URI (json-string)
 627
 628 Example:
 629
 630 -> { "execute": "migrate", "arguments": { "uri": "tcp:0:4446" } }
 631 <- { "return": {} }
 632
 633 Notes:
 634
 635 (1) The 'query-migrate' command should be used to check migration's progress
 636     and final result (this information is provided by the 'status' member)
 637 (2) All boolean arguments default to false
 638 (3) The user Monitor's "detach" argument is invalid in QMP and should not
 639     be used
 640
 641 EQMP
 642
 643     {
 644         .name       = "migrate_cancel",
 645         .args_type  = "",
 646         .mhandler.cmd_new = qmp_marshal_input_migrate_cancel,
 647     },
 648
 649 SQMP
 650 migrate_cancel
 651 --------------
 652
 653 Cancel the current migration.
 654
 655 Arguments: None.
 656
 657 Example:
 658
 659 -> { "execute": "migrate_cancel" }
 660 <- { "return": {} }
 661
 662 EQMP
 663
 664     {
 665         .name       = "migrate-incoming",
 666         .args_type  = "uri:s",
 667         .mhandler.cmd_new = qmp_marshal_input_migrate_incoming,
 668     },
 669
 670 SQMP
 671 migrate-incoming
 672 ----------------
 673
 674 Continue an incoming migration
 675
 676 Arguments:
 677
 678 - "uri": Source/listening URI (json-string)
 679
 680 Example:
 681
 682 -> { "execute": "migrate-incoming", "arguments": { "uri": "tcp::4446" } }
 683 <- { "return": {} }
 684
 685 Notes:
 686
 687 (1) QEMU must be started with -incoming defer to allow migrate-incoming to
 688     be used
 689 (2) The uri format is the same as to -incoming
 690
 691 EQMP
 692     {
 693         .name       = "migrate-set-cache-size",
 694         .args_type  = "value:o",
 695         .mhandler.cmd_new = qmp_marshal_input_migrate_set_cache_size,
 696     },
 697
 698 SQMP
 699 migrate-set-cache-size
 700 ----------------------
 701
 702 Set cache size to be used by XBZRLE migration, the cache size will be rounded
 703 down to the nearest power of 2
 704
 705 Arguments:
 706
 707 - "value": cache size in bytes (json-int)
 708
 709 Example:
 710
 711 -> { "execute": "migrate-set-cache-size", "arguments": { "value": 536870912 } }
 712 <- { "return": {} }
 713
 714 EQMP
 715     {
 716         .name       = "query-migrate-cache-size",
 717         .args_type  = "",
 718         .mhandler.cmd_new = qmp_marshal_input_query_migrate_cache_size,
 719     },
 720
 721 SQMP
 722 query-migrate-cache-size
 723 ------------------------
 724
 725 Show cache size to be used by XBZRLE migration
 726
 727 returns a json-object with the following information:
 728 - "size" : json-int
 729
 730 Example:
 731
 732 -> { "execute": "query-migrate-cache-size" }
 733 <- { "return": 67108864 }
 734
 735 EQMP
 736
 737     {
 738         .name       = "migrate_set_speed",
 739         .args_type  = "value:o",
 740         .mhandler.cmd_new = qmp_marshal_input_migrate_set_speed,
 741     },
 742
 743 SQMP
 744 migrate_set_speed
 745 -----------------
 746
 747 Set maximum speed for migrations.
 748
 749 Arguments:
 750
 751 - "value": maximum speed, in bytes per second (json-int)
 752
 753 Example:
 754
 755 -> { "execute": "migrate_set_speed", "arguments": { "value": 1024 } }
 756 <- { "return": {} }
 757
 758 EQMP
 759
 760     {
 761         .name       = "migrate_set_downtime",
 762         .args_type  = "value:T",
 763         .mhandler.cmd_new = qmp_marshal_input_migrate_set_downtime,
 764     },
 765
 766 SQMP
 767 migrate_set_downtime
 768 --------------------
 769
 770 Set maximum tolerated downtime (in seconds) for migrations.
 771
 772 Arguments:
 773
 774 - "value": maximum downtime (json-number)
 775
 776 Example:
 777
 778 -> { "execute": "migrate_set_downtime", "arguments": { "value": 0.1 } }
 779 <- { "return": {} }
 780
 781 EQMP
 782
 783     {
 784         .name       = "client_migrate_info",
 785         .args_type  = "protocol:s,hostname:s,port:i?,tls-port:i?,cert-subject:s?",
 786         .params     = "protocol hostname port tls-port cert-subject",
 787         .help       = "send migration info to spice/vnc client",
 788         .mhandler.cmd_new = client_migrate_info,
 789     },
 790
 791 SQMP
 792 client_migrate_info
 793 ------------------
 794
 795 Set the spice/vnc connection info for the migration target.  The spice/vnc
 796 server will ask the spice/vnc client to automatically reconnect using the
 797 new parameters (if specified) once the vm migration finished successfully.
 798
 799 Arguments:
 800
 801 - "protocol":     protocol: "spice" or "vnc" (json-string)
 802 - "hostname":     migration target hostname (json-string)
 803 - "port":         spice/vnc tcp port for plaintext channels (json-int, optional)
 804 - "tls-port":     spice tcp port for tls-secured channels (json-int, optional)
 805 - "cert-subject": server certificate subject (json-string, optional)
 806
 807 Example:
 808
 809 -> { "execute": "client_migrate_info",
 810      "arguments": { "protocol": "spice",
 811                     "hostname": "virt42.lab.kraxel.org",
 812                     "port": 1234 } }
 813 <- { "return": {} }
 814
 815 EQMP
 816
 817     {
 818         .name       = "dump-guest-memory",
 819         .args_type  = "paging:b,protocol:s,begin:i?,end:i?,format:s?",
 820         .params     = "-p protocol [begin] [length] [format]",
 821         .help       = "dump guest memory to file",
 822         .mhandler.cmd_new = qmp_marshal_input_dump_guest_memory,
 823     },
 824
 825 SQMP
 826 dump
 827
 828
 829 Dump guest memory to file. The file can be processed with crash or gdb.
 830
 831 Arguments:
 832
 833 - "paging": do paging to get guest's memory mapping (json-bool)
 834 - "protocol": destination file(started with "file:") or destination file
 835               descriptor (started with "fd:") (json-string)
 836 - "begin": the starting physical address. It's optional, and should be specified
 837            with length together (json-int)
 838 - "length": the memory size, in bytes. It's optional, and should be specified
 839             with begin together (json-int)
 840 - "format": the format of guest memory dump. It's optional, and can be
 841             elf|kdump-zlib|kdump-lzo|kdump-snappy, but non-elf formats will
 842             conflict with paging and filter, ie. begin and length (json-string)
 843
 844 Example:
 845
 846 -> { "execute": "dump-guest-memory", "arguments": { "protocol": "fd:dump" } }
 847 <- { "return": {} }
 848
 849 Notes:
 850
 851 (1) All boolean arguments default to false
 852
 853 EQMP
 854
 855     {
 856         .name       = "query-dump-guest-memory-capability",
 857         .args_type  = "",
 858     .mhandler.cmd_new = qmp_marshal_input_query_dump_guest_memory_capability,
 859     },
 860
 861 SQMP
 862 query-dump-guest-memory-capability
 863 ----------
 864
 865 Show available formats for 'dump-guest-memory'
 866
 867 Example:
 868
 869 -> { "execute": "query-dump-guest-memory-capability" }
 870 <- { "return": { "formats":
 871                     ["elf", "kdump-zlib", "kdump-lzo", "kdump-snappy"] }
 872
 873 EQMP
 874
 875     {
 876         .name       = "netdev_add",
 877         .args_type  = "netdev:O",
 878         .mhandler.cmd_new = qmp_netdev_add,
 879     },
 880
 881 SQMP
 882 netdev_add
 883 ----------
 884
 885 Add host network device.
 886
 887 Arguments:
 888
 889 - "type": the device type, "tap", "user", ... (json-string)
 890 - "id": the device's ID, must be unique (json-string)
 891 - device options
 892
 893 Example:
 894
 895 -> { "execute": "netdev_add", "arguments": { "type": "user", "id": "netdev1" } }
 896 <- { "return": {} }
 897
 898 Note: The supported device options are the same ones supported by the '-netdev'
 899       command-line argument, which are listed in the '-help' output or QEMU's
 900       manual
 901
 902 EQMP
 903
 904     {
 905         .name       = "netdev_del",
 906         .args_type  = "id:s",
 907         .mhandler.cmd_new = qmp_marshal_input_netdev_del,
 908     },
 909
 910 SQMP
 911 netdev_del
 912 ----------
 913
 914 Remove host network device.
 915
 916 Arguments:
 917
 918 - "id": the device's ID, must be unique (json-string)
 919
 920 Example:
 921
 922 -> { "execute": "netdev_del", "arguments": { "id": "netdev1" } }
 923 <- { "return": {} }
 924
 925
 926 EQMP
 927
 928     {
 929         .name       = "object-add",
 930         .args_type  = "qom-type:s,id:s,props:q?",
 931         .mhandler.cmd_new = qmp_object_add,
 932     },
 933
 934 SQMP
 935 object-add
 936 ----------
 937
 938 Create QOM object.
 939
 940 Arguments:
 941
 942 - "qom-type": the object's QOM type, i.e. the class name (json-string)
 943 - "id": the object's ID, must be unique (json-string)
 944 - "props": a dictionary of object property values (optional, json-dict)
 945
 946 Example:
 947
 948 -> { "execute": "object-add", "arguments": { "qom-type": "rng-random", "id": "rng1",
 949      "props": { "filename": "/dev/hwrng" } } }
 950 <- { "return": {} }
 951
 952 EQMP
 953
 954     {
 955         .name       = "object-del",
 956         .args_type  = "id:s",
 957         .mhandler.cmd_new = qmp_marshal_input_object_del,
 958     },
 959
 960 SQMP
 961 object-del
 962 ----------
 963
 964 Remove QOM object.
 965
 966 Arguments:
 967
 968 - "id": the object's ID (json-string)
 969
 970 Example:
 971
 972 -> { "execute": "object-del", "arguments": { "id": "rng1" } }
 973 <- { "return": {} }
 974
 975
 976 EQMP
 977
 978
 979     {
 980         .name       = "block_resize",
 981         .args_type  = "device:s?,node-name:s?,size:o",
 982         .mhandler.cmd_new = qmp_marshal_input_block_resize,
 983     },
 984
 985 SQMP
 986 block_resize
 987 ------------
 988
 989 Resize a block image while a guest is running.
 990
 991 Arguments:
 992
 993 - "device": the device's ID, must be unique (json-string)
 994 - "node-name": the node name in the block driver state graph (json-string)
 995 - "size": new size
 996
 997 Example:
 998
 999 -> { "execute": "block_resize", "arguments": { "device": "scratch", "size": 1073741824 } }
1000 <- { "return": {} }
1001
1002 EQMP
1003
1004     {
1005         .name       = "block-stream",
1006         .args_type  = "device:B,base:s?,speed:o?,backing-file:s?,on-error:s?",
1007         .mhandler.cmd_new = qmp_marshal_input_block_stream,
1008     },
1009
1010 SQMP
1011 block-stream
1012 ------------
1013
1014 Copy data from a backing file into a block device.
1015
1016 Arguments:
1017
1018 - "device": The device's ID, must be unique (json-string)
1019 - "base": The file name of the backing image above which copying starts
1020           (json-string, optional)
1021 - "backing-file": The backing file string to write into the active layer. This
1022                   filename is not validated.
1023
1024                   If a pathname string is such that it cannot be resolved by
1025                   QEMU, that means that subsequent QMP or HMP commands must use
1026                   node-names for the image in question, as filename lookup
1027                   methods will fail.
1028
1029                   If not specified, QEMU will automatically determine the
1030                   backing file string to use, or error out if there is no
1031                   obvious choice.  Care should be taken when specifying the
1032                   string, to specify a valid filename or protocol.
1033                   (json-string, optional) (Since 2.1)
1034 - "speed":  the maximum speed, in bytes per second (json-int, optional)
1035 - "on-error": the action to take on an error (default 'report').  'stop' and
1036               'enospc' can only be used if the block device supports io-status.
1037               (json-string, optional) (Since 2.1)
1038
1039 Example:
1040
1041 -> { "execute": "block-stream", "arguments": { "device": "virtio0",
1042                                                "base": "/tmp/master.qcow2" } }
1043 <- { "return": {} }
1044
1045 EQMP
1046
1047     {
1048         .name       = "block-commit",
1049         .args_type  = "device:B,base:s?,top:s?,backing-file:s?,speed:o?",
1050         .mhandler.cmd_new = qmp_marshal_input_block_commit,
1051     },
1052
1053 SQMP
1054 block-commit
1055 ------------
1056
1057 Live commit of data from overlay image nodes into backing nodes - i.e., writes
1058 data between 'top' and 'base' into 'base'.
1059
1060 Arguments:
1061
1062 - "device": The device's ID, must be unique (json-string)
1063 - "base": The file name of the backing image to write data into.
1064           If not specified, this is the deepest backing image
1065           (json-string, optional)
1066 - "top":  The file name of the backing image within the image chain,
1067           which contains the topmost data to be committed down. If
1068           not specified, this is the active layer. (json-string, optional)
1069
1070 - backing-file:     The backing file string to write into the overlay
1071                     image of 'top'.  If 'top' is the active layer,
1072                     specifying a backing file string is an error. This
1073                     filename is not validated.
1074
1075                     If a pathname string is such that it cannot be
1076                     resolved by QEMU, that means that subsequent QMP or
1077                     HMP commands must use node-names for the image in
1078                     question, as filename lookup methods will fail.
1079
1080                     If not specified, QEMU will automatically determine
1081                     the backing file string to use, or error out if
1082                     there is no obvious choice. Care should be taken
1083                     when specifying the string, to specify a valid
1084                     filename or protocol.
1085                     (json-string, optional) (Since 2.1)
1086
1087           If top == base, that is an error.
1088           If top == active, the job will not be completed by itself,
1089           user needs to complete the job with the block-job-complete
1090           command after getting the ready event. (Since 2.0)
1091
1092           If the base image is smaller than top, then the base image
1093           will be resized to be the same size as top.  If top is
1094           smaller than the base image, the base will not be
1095           truncated.  If you want the base image size to match the
1096           size of the smaller top, you can safely truncate it
1097           yourself once the commit operation successfully completes.
1098           (json-string)
1099 - "speed":  the maximum speed, in bytes per second (json-int, optional)
1100
1101
1102 Example:
1103
1104 -> { "execute": "block-commit", "arguments": { "device": "virtio0",
1105                                               "top": "/tmp/snap1.qcow2" } }
1106 <- { "return": {} }
1107
1108 EQMP
1109
1110     {
1111         .name       = "drive-backup",
1112         .args_type  = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?,"
1113                       "bitmap:s?,on-source-error:s?,on-target-error:s?",
1114         .mhandler.cmd_new = qmp_marshal_input_drive_backup,
1115     },
1116
1117 SQMP
1118 drive-backup
1119 ------------
1120
1121 Start a point-in-time copy of a block device to a new destination.  The
1122 status of ongoing drive-backup operations can be checked with
1123 query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
1124 The operation can be stopped before it has completed using the
1125 block-job-cancel command.
1126
1127 Arguments:
1128
1129 - "device": the name of the device which should be copied.
1130             (json-string)
1131 - "target": the target of the new image. If the file exists, or if it is a
1132             device, the existing file/device will be used as the new
1133             destination.  If it does not exist, a new file will be created.
1134             (json-string)
1135 - "format": the format of the new destination, default is to probe if 'mode' is
1136             'existing', else the format of the source
1137             (json-string, optional)
1138 - "sync": what parts of the disk image should be copied to the destination;
1139   possibilities include "full" for all the disk, "top" for only the sectors
1140   allocated in the topmost image, "dirty-bitmap" for only the dirty sectors in
1141   the bitmap, or "none" to only replicate new I/O (MirrorSyncMode).
1142 - "bitmap": dirty bitmap name for sync==dirty-bitmap. Must be present if sync
1143             is "dirty-bitmap", must NOT be present otherwise.
1144 - "mode": whether and how QEMU should create a new image
1145           (NewImageMode, optional, default 'absolute-paths')
1146 - "speed": the maximum speed, in bytes per second (json-int, optional)
1147 - "on-source-error": the action to take on an error on the source, default
1148                      'report'.  'stop' and 'enospc' can only be used
1149                      if the block device supports io-status.
1150                      (BlockdevOnError, optional)
1151 - "on-target-error": the action to take on an error on the target, default
1152                      'report' (no limitations, since this applies to
1153                      a different block device than device).
1154                      (BlockdevOnError, optional)
1155
1156 Example:
1157 -> { "execute": "drive-backup", "arguments": { "device": "drive0",
1158                                                "sync": "full",
1159                                                "target": "backup.img" } }
1160 <- { "return": {} }
1161
1162 EQMP
1163
1164     {
1165         .name       = "blockdev-backup",
1166         .args_type  = "sync:s,device:B,target:B,speed:i?,"
1167                       "on-source-error:s?,on-target-error:s?",
1168         .mhandler.cmd_new = qmp_marshal_input_blockdev_backup,
1169     },
1170
1171 SQMP
1172 blockdev-backup
1173 ---------------
1174
1175 The device version of drive-backup: this command takes an existing named device
1176 as backup target.
1177
1178 Arguments:
1179
1180 - "device": the name of the device which should be copied.
1181             (json-string)
1182 - "target": the name of the backup target device. (json-string)
1183 - "sync": what parts of the disk image should be copied to the destination;
1184           possibilities include "full" for all the disk, "top" for only the
1185           sectors allocated in the topmost image, or "none" to only replicate
1186           new I/O (MirrorSyncMode).
1187 - "speed": the maximum speed, in bytes per second (json-int, optional)
1188 - "on-source-error": the action to take on an error on the source, default
1189                      'report'.  'stop' and 'enospc' can only be used
1190                      if the block device supports io-status.
1191                      (BlockdevOnError, optional)
1192 - "on-target-error": the action to take on an error on the target, default
1193                      'report' (no limitations, since this applies to
1194                      a different block device than device).
1195                      (BlockdevOnError, optional)
1196
1197 Example:
1198 -> { "execute": "blockdev-backup", "arguments": { "device": "src-id",
1199                                                   "sync": "full",
1200                                                   "target": "tgt-id" } }
1201 <- { "return": {} }
1202
1203 EQMP
1204
1205     {
1206         .name       = "block-job-set-speed",
1207         .args_type  = "device:B,speed:o",
1208         .mhandler.cmd_new = qmp_marshal_input_block_job_set_speed,
1209     },
1210
1211     {
1212         .name       = "block-job-cancel",
1213         .args_type  = "device:B,force:b?",
1214         .mhandler.cmd_new = qmp_marshal_input_block_job_cancel,
1215     },
1216     {
1217         .name       = "block-job-pause",
1218         .args_type  = "device:B",
1219         .mhandler.cmd_new = qmp_marshal_input_block_job_pause,
1220     },
1221     {
1222         .name       = "block-job-resume",
1223         .args_type  = "device:B",
1224         .mhandler.cmd_new = qmp_marshal_input_block_job_resume,
1225     },
1226     {
1227         .name       = "block-job-complete",
1228         .args_type  = "device:B",
1229         .mhandler.cmd_new = qmp_marshal_input_block_job_complete,
1230     },
1231     {
1232         .name       = "transaction",
1233         .args_type  = "actions:q",
1234         .mhandler.cmd_new = qmp_marshal_input_transaction,
1235     },
1236
1237 SQMP
1238 transaction
1239 -----------
1240
1241 Atomically operate on one or more block devices.  The only supported operations
1242 for now are drive-backup, internal and external snapshotting.  A list of
1243 dictionaries is accepted, that contains the actions to be performed.
1244 If there is any failure performing any of the operations, all operations
1245 for the group are abandoned.
1246
1247 For external snapshots, the dictionary contains the device, the file to use for
1248 the new snapshot, and the format.  The default format, if not specified, is
1249 qcow2.
1250
1251 Each new snapshot defaults to being created by QEMU (wiping any
1252 contents if the file already exists), but it is also possible to reuse
1253 an externally-created file.  In the latter case, you should ensure that
1254 the new image file has the same contents as the current one; QEMU cannot
1255 perform any meaningful check.  Typically this is achieved by using the
1256 current image file as the backing file for the new image.
1257
1258 On failure, the original disks pre-snapshot attempt will be used.
1259
1260 For internal snapshots, the dictionary contains the device and the snapshot's
1261 name.  If an internal snapshot matching name already exists, the request will
1262 be rejected.  Only some image formats support it, for example, qcow2, rbd,
1263 and sheepdog.
1264
1265 On failure, qemu will try delete the newly created internal snapshot in the
1266 transaction.  When an I/O error occurs during deletion, the user needs to fix
1267 it later with qemu-img or other command.
1268
1269 Arguments:
1270
1271 actions array:
1272     - "type": the operation to perform.  The only supported
1273       value is "blockdev-snapshot-sync". (json-string)
1274     - "data": a dictionary.  The contents depend on the value
1275       of "type".  When "type" is "blockdev-snapshot-sync":
1276       - "device": device name to snapshot (json-string)
1277       - "node-name": graph node name to snapshot (json-string)
1278       - "snapshot-file": name of new image file (json-string)
1279       - "snapshot-node-name": graph node name of the new snapshot (json-string)
1280       - "format": format of new image (json-string, optional)
1281       - "mode": whether and how QEMU should create the snapshot file
1282         (NewImageMode, optional, default "absolute-paths")
1283       When "type" is "blockdev-snapshot-internal-sync":
1284       - "device": device name to snapshot (json-string)
1285       - "name": name of the new snapshot (json-string)
1286
1287 Example:
1288
1289 -> { "execute": "transaction",
1290      "arguments": { "actions": [
1291          { "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd0",
1292                                          "snapshot-file": "/some/place/my-image",
1293                                          "format": "qcow2" } },
1294          { "type": "blockdev-snapshot-sync", "data" : { "node-name": "myfile",
1295                                          "snapshot-file": "/some/place/my-image2",
1296                                          "snapshot-node-name": "node3432",
1297                                          "mode": "existing",
1298                                          "format": "qcow2" } },
1299          { "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd1",
1300                                          "snapshot-file": "/some/place/my-image2",
1301                                          "mode": "existing",
1302                                          "format": "qcow2" } },
1303          { "type": "blockdev-snapshot-internal-sync", "data" : {
1304                                          "device": "ide-hd2",
1305                                          "name": "snapshot0" } } ] } }
1306 <- { "return": {} }
1307
1308 EQMP
1309
1310     {
1311         .name       = "block-dirty-bitmap-add",
1312         .args_type  = "node:B,name:s,granularity:i?",
1313         .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_add,
1314     },
1315
1316 SQMP
1317
1318 block-dirty-bitmap-add
1319 ----------------------
1320 Since 2.4
1321
1322 Create a dirty bitmap with a name on the device, and start tracking the writes.
1323
1324 Arguments:
1325
1326 - "node": device/node on which to create dirty bitmap (json-string)
1327 - "name": name of the new dirty bitmap (json-string)
1328 - "granularity": granularity to track writes with (int, optional)
1329
1330 Example:
1331
1332 -> { "execute": "block-dirty-bitmap-add", "arguments": { "node": "drive0",
1333                                                    "name": "bitmap0" } }
1334 <- { "return": {} }
1335
1336 EQMP
1337
1338     {
1339         .name       = "block-dirty-bitmap-remove",
1340         .args_type  = "node:B,name:s",
1341         .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_remove,
1342     },
1343
1344 SQMP
1345
1346 block-dirty-bitmap-remove
1347 -------------------------
1348 Since 2.4
1349
1350 Stop write tracking and remove the dirty bitmap that was created with
1351 block-dirty-bitmap-add.
1352
1353 Arguments:
1354
1355 - "node": device/node on which to remove dirty bitmap (json-string)
1356 - "name": name of the dirty bitmap to remove (json-string)
1357
1358 Example:
1359
1360 -> { "execute": "block-dirty-bitmap-remove", "arguments": { "node": "drive0",
1361                                                       "name": "bitmap0" } }
1362 <- { "return": {} }
1363
1364 EQMP
1365
1366     {
1367         .name       = "block-dirty-bitmap-clear",
1368         .args_type  = "node:B,name:s",
1369         .mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_clear,
1370     },
1371
1372 SQMP
1373
1374 block-dirty-bitmap-clear
1375 ------------------------
1376 Since 2.4
1377
1378 Reset the dirty bitmap associated with a node so that an incremental backup
1379 from this point in time forward will only backup clusters modified after this
1380 clear operation.
1381
1382 Arguments:
1383
1384 - "node": device/node on which to remove dirty bitmap (json-string)
1385 - "name": name of the dirty bitmap to remove (json-string)
1386
1387 Example:
1388
1389 -> { "execute": "block-dirty-bitmap-clear", "arguments": { "node": "drive0",
1390                                                            "name": "bitmap0" } }
1391 <- { "return": {} }
1392
1393 EQMP
1394
1395     {
1396         .name       = "blockdev-snapshot-sync",
1397         .args_type  = "device:s?,node-name:s?,snapshot-file:s,snapshot-node-name:s?,format:s?,mode:s?",
1398         .mhandler.cmd_new = qmp_marshal_input_blockdev_snapshot_sync,
1399     },
1400
1401 SQMP
1402 blockdev-snapshot-sync
1403 ----------------------
1404
1405 Synchronous snapshot of a block device. snapshot-file specifies the
1406 target of the new image. If the file exists, or if it is a device, the
1407 snapshot will be created in the existing file/device. If does not
1408 exist, a new file will be created. format specifies the format of the
1409 snapshot image, default is qcow2.
1410
1411 Arguments:
1412
1413 - "device": device name to snapshot (json-string)
1414 - "node-name": graph node name to snapshot (json-string)
1415 - "snapshot-file": name of new image file (json-string)
1416 - "snapshot-node-name": graph node name of the new snapshot (json-string)
1417 - "mode": whether and how QEMU should create the snapshot file
1418   (NewImageMode, optional, default "absolute-paths")
1419 - "format": format of new image (json-string, optional)
1420
1421 Example:
1422
1423 -> { "execute": "blockdev-snapshot-sync", "arguments": { "device": "ide-hd0",
1424                                                          "snapshot-file":
1425                                                         "/some/place/my-image",
1426                                                         "format": "qcow2" } }
1427 <- { "return": {} }
1428
1429 EQMP
1430
1431     {
1432         .name       = "blockdev-snapshot-internal-sync",
1433         .args_type  = "device:B,name:s",
1434         .mhandler.cmd_new = qmp_marshal_input_blockdev_snapshot_internal_sync,
1435     },
1436
1437 SQMP
1438 blockdev-snapshot-internal-sync
1439 -------------------------------
1440
1441 Synchronously take an internal snapshot of a block device when the format of
1442 image used supports it.  If the name is an empty string, or a snapshot with
1443 name already exists, the operation will fail.
1444
1445 Arguments:
1446
1447 - "device": device name to snapshot (json-string)
1448 - "name": name of the new snapshot (json-string)
1449
1450 Example:
1451
1452 -> { "execute": "blockdev-snapshot-internal-sync",
1453                 "arguments": { "device": "ide-hd0",
1454                                "name": "snapshot0" }
1455    }
1456 <- { "return": {} }
1457
1458 EQMP
1459
1460     {
1461         .name       = "blockdev-snapshot-delete-internal-sync",
1462         .args_type  = "device:B,id:s?,name:s?",
1463         .mhandler.cmd_new =
1464                       qmp_marshal_input_blockdev_snapshot_delete_internal_sync,
1465     },
1466
1467 SQMP
1468 blockdev-snapshot-delete-internal-sync
1469 --------------------------------------
1470
1471 Synchronously delete an internal snapshot of a block device when the format of
1472 image used supports it.  The snapshot is identified by name or id or both.  One
1473 of name or id is required.  If the snapshot is not found, the operation will
1474 fail.
1475
1476 Arguments:
1477
1478 - "device": device name (json-string)
1479 - "id": ID of the snapshot (json-string, optional)
1480 - "name": name of the snapshot (json-string, optional)
1481
1482 Example:
1483
1484 -> { "execute": "blockdev-snapshot-delete-internal-sync",
1485                 "arguments": { "device": "ide-hd0",
1486                                "name": "snapshot0" }
1487    }
1488 <- { "return": {
1489                    "id": "1",
1490                    "name": "snapshot0",
1491                    "vm-state-size": 0,
1492                    "date-sec": 1000012,
1493                    "date-nsec": 10,
1494                    "vm-clock-sec": 100,
1495                    "vm-clock-nsec": 20
1496      }
1497    }
1498
1499 EQMP
1500
1501     {
1502         .name       = "drive-mirror",
1503         .args_type  = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?,"
1504                       "node-name:s?,replaces:s?,"
1505                       "on-source-error:s?,on-target-error:s?,"
1506                       "granularity:i?,buf-size:i?",
1507         .mhandler.cmd_new = qmp_marshal_input_drive_mirror,
1508     },
1509
1510 SQMP
1511 drive-mirror
1512 ------------
1513
1514 Start mirroring a block device's writes to a new destination. target
1515 specifies the target of the new image. If the file exists, or if it is
1516 a device, it will be used as the new destination for writes. If it does not
1517 exist, a new file will be created. format specifies the format of the
1518 mirror image, default is to probe if mode='existing', else the format
1519 of the source.
1520
1521 Arguments:
1522
1523 - "device": device name to operate on (json-string)
1524 - "target": name of new image file (json-string)
1525 - "format": format of new image (json-string, optional)
1526 - "node-name": the name of the new block driver state in the node graph
1527                (json-string, optional)
1528 - "replaces": the block driver node name to replace when finished
1529               (json-string, optional)
1530 - "mode": how an image file should be created into the target
1531   file/device (NewImageMode, optional, default 'absolute-paths')
1532 - "speed": maximum speed of the streaming job, in bytes per second
1533   (json-int)
1534 - "granularity": granularity of the dirty bitmap, in bytes (json-int, optional)
1535 - "buf_size": maximum amount of data in flight from source to target, in bytes
1536   (json-int, default 10M)
1537 - "sync": what parts of the disk image should be copied to the destination;
1538   possibilities include "full" for all the disk, "top" for only the sectors
1539   allocated in the topmost image, or "none" to only replicate new I/O
1540   (MirrorSyncMode).
1541 - "on-source-error": the action to take on an error on the source
1542   (BlockdevOnError, default 'report')
1543 - "on-target-error": the action to take on an error on the target
1544   (BlockdevOnError, default 'report')
1545
1546 The default value of the granularity is the image cluster size clamped
1547 between 4096 and 65536, if the image format defines one.  If the format
1548 does not define a cluster size, the default value of the granularity
1549 is 65536.
1550
1551
1552 Example:
1553
1554 -> { "execute": "drive-mirror", "arguments": { "device": "ide-hd0",
1555                                                "target": "/some/place/my-image",
1556                                                "sync": "full",
1557                                                "format": "qcow2" } }
1558 <- { "return": {} }
1559
1560 EQMP
1561
1562     {
1563         .name       = "change-backing-file",
1564         .args_type  = "device:s,image-node-name:s,backing-file:s",
1565         .mhandler.cmd_new = qmp_marshal_input_change_backing_file,
1566     },
1567
1568 SQMP
1569 change-backing-file
1570 -------------------
1571 Since: 2.1
1572
1573 Change the backing file in the image file metadata.  This does not cause
1574 QEMU to reopen the image file to reparse the backing filename (it may,
1575 however, perform a reopen to change permissions from r/o -> r/w -> r/o,
1576 if needed). The new backing file string is written into the image file
1577 metadata, and the QEMU internal strings are updated.
1578
1579 Arguments:
1580
1581 - "image-node-name":    The name of the block driver state node of the
1582                         image to modify.  The "device" is argument is used to
1583                         verify "image-node-name" is in the chain described by
1584                         "device".
1585                         (json-string, optional)
1586
1587 - "device":             The name of the device.
1588                         (json-string)
1589
1590 - "backing-file":       The string to write as the backing file.  This string is
1591                         not validated, so care should be taken when specifying
1592                         the string or the image chain may not be able to be
1593                         reopened again.
1594                         (json-string)
1595
1596 Returns: Nothing on success
1597          If "device" does not exist or cannot be determined, DeviceNotFound
1598
1599 EQMP
1600
1601     {
1602         .name       = "balloon",
1603         .args_type  = "value:M",
1604         .mhandler.cmd_new = qmp_marshal_input_balloon,
1605     },
1606
1607 SQMP
1608 balloon
1609 -------
1610
1611 Request VM to change its memory allocation (in bytes).
1612
1613 Arguments:
1614
1615 - "value": New memory allocation (json-int)
1616
1617 Example:
1618
1619 -> { "execute": "balloon", "arguments": { "value": 536870912 } }
1620 <- { "return": {} }
1621
1622 EQMP
1623
1624     {
1625         .name       = "set_link",
1626         .args_type  = "name:s,up:b",
1627         .mhandler.cmd_new = qmp_marshal_input_set_link,
1628     },
1629
1630 SQMP
1631 set_link
1632 --------
1633
1634 Change the link status of a network adapter.
1635
1636 Arguments:
1637
1638 - "name": network device name (json-string)
1639 - "up": status is up (json-bool)
1640
1641 Example:
1642
1643 -> { "execute": "set_link", "arguments": { "name": "e1000.0", "up": false } }
1644 <- { "return": {} }
1645
1646 EQMP
1647
1648     {
1649         .name       = "getfd",
1650         .args_type  = "fdname:s",
1651         .params     = "getfd name",
1652         .help       = "receive a file descriptor via SCM rights and assign it a name",
1653         .mhandler.cmd_new = qmp_marshal_input_getfd,
1654     },
1655
1656 SQMP
1657 getfd
1658 -----
1659
1660 Receive a file descriptor via SCM rights and assign it a name.
1661
1662 Arguments:
1663
1664 - "fdname": file descriptor name (json-string)
1665
1666 Example:
1667
1668 -> { "execute": "getfd", "arguments": { "fdname": "fd1" } }
1669 <- { "return": {} }
1670
1671 Notes:
1672
1673 (1) If the name specified by the "fdname" argument already exists,
1674     the file descriptor assigned to it will be closed and replaced
1675     by the received file descriptor.
1676 (2) The 'closefd' command can be used to explicitly close the file
1677     descriptor when it is no longer needed.
1678
1679 EQMP
1680
1681     {
1682         .name       = "closefd",
1683         .args_type  = "fdname:s",
1684         .params     = "closefd name",
1685         .help       = "close a file descriptor previously passed via SCM rights",
1686         .mhandler.cmd_new = qmp_marshal_input_closefd,
1687     },
1688
1689 SQMP
1690 closefd
1691 -------
1692
1693 Close a file descriptor previously passed via SCM rights.
1694
1695 Arguments:
1696
1697 - "fdname": file descriptor name (json-string)
1698
1699 Example:
1700
1701 -> { "execute": "closefd", "arguments": { "fdname": "fd1" } }
1702 <- { "return": {} }
1703
1704 EQMP
1705
1706      {
1707         .name       = "add-fd",
1708         .args_type  = "fdset-id:i?,opaque:s?",
1709         .params     = "add-fd fdset-id opaque",
1710         .help       = "Add a file descriptor, that was passed via SCM rights, to an fd set",
1711         .mhandler.cmd_new = qmp_marshal_input_add_fd,
1712     },
1713
1714 SQMP
1715 add-fd
1716 -------
1717
1718 Add a file descriptor, that was passed via SCM rights, to an fd set.
1719
1720 Arguments:
1721
1722 - "fdset-id": The ID of the fd set to add the file descriptor to.
1723               (json-int, optional)
1724 - "opaque": A free-form string that can be used to describe the fd.
1725             (json-string, optional)
1726
1727 Return a json-object with the following information:
1728
1729 - "fdset-id": The ID of the fd set that the fd was added to. (json-int)
1730 - "fd": The file descriptor that was received via SCM rights and added to the
1731         fd set. (json-int)
1732
1733 Example:
1734
1735 -> { "execute": "add-fd", "arguments": { "fdset-id": 1 } }
1736 <- { "return": { "fdset-id": 1, "fd": 3 } }
1737
1738 Notes:
1739
1740 (1) The list of fd sets is shared by all monitor connections.
1741 (2) If "fdset-id" is not specified, a new fd set will be created.
1742
1743 EQMP
1744
1745      {
1746         .name       = "remove-fd",
1747         .args_type  = "fdset-id:i,fd:i?",
1748         .params     = "remove-fd fdset-id fd",
1749         .help       = "Remove a file descriptor from an fd set",
1750         .mhandler.cmd_new = qmp_marshal_input_remove_fd,
1751     },
1752
1753 SQMP
1754 remove-fd
1755 ---------
1756
1757 Remove a file descriptor from an fd set.
1758
1759 Arguments:
1760
1761 - "fdset-id": The ID of the fd set that the file descriptor belongs to.
1762               (json-int)
1763 - "fd": The file descriptor that is to be removed. (json-int, optional)
1764
1765 Example:
1766
1767 -> { "execute": "remove-fd", "arguments": { "fdset-id": 1, "fd": 3 } }
1768 <- { "return": {} }
1769
1770 Notes:
1771
1772 (1) The list of fd sets is shared by all monitor connections.
1773 (2) If "fd" is not specified, all file descriptors in "fdset-id" will be
1774     removed.
1775
1776 EQMP
1777
1778     {
1779         .name       = "query-fdsets",
1780         .args_type  = "",
1781         .help       = "Return information describing all fd sets",
1782         .mhandler.cmd_new = qmp_marshal_input_query_fdsets,
1783     },
1784
1785 SQMP
1786 query-fdsets
1787 -------------
1788
1789 Return information describing all fd sets.
1790
1791 Arguments: None
1792
1793 Example:
1794
1795 -> { "execute": "query-fdsets" }
1796 <- { "return": [
1797        {
1798          "fds": [
1799            {
1800              "fd": 30,
1801              "opaque": "rdonly:/path/to/file"
1802            },
1803            {
1804              "fd": 24,
1805              "opaque": "rdwr:/path/to/file"
1806            }
1807          ],
1808          "fdset-id": 1
1809        },
1810        {
1811          "fds": [
1812            {
1813              "fd": 28
1814            },
1815            {
1816              "fd": 29
1817            }
1818          ],
1819          "fdset-id": 0
1820        }
1821      ]
1822    }
1823
1824 Note: The list of fd sets is shared by all monitor connections.
1825
1826 EQMP
1827
1828     {
1829         .name       = "block_passwd",
1830         .args_type  = "device:s?,node-name:s?,password:s",
1831         .mhandler.cmd_new = qmp_marshal_input_block_passwd,
1832     },
1833
1834 SQMP
1835 block_passwd
1836 ------------
1837
1838 Set the password of encrypted block devices.
1839
1840 Arguments:
1841
1842 - "device": device name (json-string)
1843 - "node-name": name in the block driver state graph (json-string)
1844 - "password": password (json-string)
1845
1846 Example:
1847
1848 -> { "execute": "block_passwd", "arguments": { "device": "ide0-hd0",
1849                                                "password": "12345" } }
1850 <- { "return": {} }
1851
1852 EQMP
1853
1854     {
1855         .name       = "block_set_io_throttle",
1856         .args_type  = "device:B,bps:l,bps_rd:l,bps_wr:l,iops:l,iops_rd:l,iops_wr:l,bps_max:l?,bps_rd_max:l?,bps_wr_max:l?,iops_max:l?,iops_rd_max:l?,iops_wr_max:l?,iops_size:l?",
1857         .mhandler.cmd_new = qmp_marshal_input_block_set_io_throttle,
1858     },
1859
1860 SQMP
1861 block_set_io_throttle
1862 ------------
1863
1864 Change I/O throttle limits for a block drive.
1865
1866 Arguments:
1867
1868 - "device": device name (json-string)
1869 - "bps": total throughput limit in bytes per second (json-int)
1870 - "bps_rd": read throughput limit in bytes per second (json-int)
1871 - "bps_wr": write throughput limit in bytes per second (json-int)
1872 - "iops": total I/O operations per second (json-int)
1873 - "iops_rd": read I/O operations per second (json-int)
1874 - "iops_wr": write I/O operations per second (json-int)
1875 - "bps_max":  total max in bytes (json-int)
1876 - "bps_rd_max":  read max in bytes (json-int)
1877 - "bps_wr_max":  write max in bytes (json-int)
1878 - "iops_max":  total I/O operations max (json-int)
1879 - "iops_rd_max":  read I/O operations max (json-int)
1880 - "iops_wr_max":  write I/O operations max (json-int)
1881 - "iops_size":  I/O size in bytes when limiting (json-int)
1882
1883 Example:
1884
1885 -> { "execute": "block_set_io_throttle", "arguments": { "device": "virtio0",
1886                                                "bps": 1000000,
1887                                                "bps_rd": 0,
1888                                                "bps_wr": 0,
1889                                                "iops": 0,
1890                                                "iops_rd": 0,
1891                                                "iops_wr": 0,
1892                                                "bps_max": 8000000,
1893                                                "bps_rd_max": 0,
1894                                                "bps_wr_max": 0,
1895                                                "iops_max": 0,
1896                                                "iops_rd_max": 0,
1897                                                "iops_wr_max": 0,
1898                                                "iops_size": 0 } }
1899 <- { "return": {} }
1900
1901 EQMP
1902
1903     {
1904         .name       = "set_password",
1905         .args_type  = "protocol:s,password:s,connected:s?",
1906         .mhandler.cmd_new = qmp_marshal_input_set_password,
1907     },
1908
1909 SQMP
1910 set_password
1911 ------------
1912
1913 Set the password for vnc/spice protocols.
1914
1915 Arguments:
1916
1917 - "protocol": protocol name (json-string)
1918 - "password": password (json-string)
1919 - "connected": [ keep | disconnect | fail ] (json-string, optional)
1920
1921 Example:
1922
1923 -> { "execute": "set_password", "arguments": { "protocol": "vnc",
1924                                                "password": "secret" } }
1925 <- { "return": {} }
1926
1927 EQMP
1928
1929     {
1930         .name       = "expire_password",
1931         .args_type  = "protocol:s,time:s",
1932         .mhandler.cmd_new = qmp_marshal_input_expire_password,
1933     },
1934
1935 SQMP
1936 expire_password
1937 ---------------
1938
1939 Set the password expire time for vnc/spice protocols.
1940
1941 Arguments:
1942
1943 - "protocol": protocol name (json-string)
1944 - "time": [ now | never | +secs | secs ] (json-string)
1945
1946 Example:
1947
1948 -> { "execute": "expire_password", "arguments": { "protocol": "vnc",
1949                                                   "time": "+60" } }
1950 <- { "return": {} }
1951
1952 EQMP
1953
1954     {
1955         .name       = "add_client",
1956         .args_type  = "protocol:s,fdname:s,skipauth:b?,tls:b?",
1957         .mhandler.cmd_new = qmp_marshal_input_add_client,
1958     },
1959
1960 SQMP
1961 add_client
1962 ----------
1963
1964 Add a graphics client
1965
1966 Arguments:
1967
1968 - "protocol": protocol name (json-string)
1969 - "fdname": file descriptor name (json-string)
1970 - "skipauth": whether to skip authentication (json-bool, optional)
1971 - "tls": whether to perform TLS (json-bool, optional)
1972
1973 Example:
1974
1975 -> { "execute": "add_client", "arguments": { "protocol": "vnc",
1976                                              "fdname": "myclient" } }
1977 <- { "return": {} }
1978
1979 EQMP
1980     {
1981         .name       = "qmp_capabilities",
1982         .args_type  = "",
1983         .params     = "",
1984         .help       = "enable QMP capabilities",
1985         .mhandler.cmd_new = do_qmp_capabilities,
1986     },
1987
1988 SQMP
1989 qmp_capabilities
1990 ----------------
1991
1992 Enable QMP capabilities.
1993
1994 Arguments: None.
1995
1996 Example:
1997
1998 -> { "execute": "qmp_capabilities" }
1999 <- { "return": {} }
2000
2001 Note: This command must be issued before issuing any other command.
2002
2003 EQMP
2004
2005     {
2006         .name       = "human-monitor-command",
2007         .args_type  = "command-line:s,cpu-index:i?",
2008         .mhandler.cmd_new = qmp_marshal_input_human_monitor_command,
2009     },
2010
2011 SQMP
2012 human-monitor-command
2013 ---------------------
2014
2015 Execute a Human Monitor command.
2016
2017 Arguments:
2018
2019 - command-line: the command name and its arguments, just like the
2020                 Human Monitor's shell (json-string)
2021 - cpu-index: select the CPU number to be used by commands which access CPU
2022              data, like 'info registers'. The Monitor selects CPU 0 if this
2023              argument is not provided (json-int, optional)
2024
2025 Example:
2026
2027 -> { "execute": "human-monitor-command", "arguments": { "command-line": "info kvm" } }
2028 <- { "return": "kvm support: enabled\r\n" }
2029
2030 Notes:
2031
2032 (1) The Human Monitor is NOT an stable interface, this means that command
2033     names, arguments and responses can change or be removed at ANY time.
2034     Applications that rely on long term stability guarantees should NOT
2035     use this command
2036
2037 (2) Limitations:
2038
2039     o This command is stateless, this means that commands that depend
2040       on state information (such as getfd) might not work
2041
2042     o Commands that prompt the user for data (eg. 'cont' when the block
2043       device is encrypted) don't currently work
2044
2045 3. Query Commands
2046 =================
2047
2048 HXCOMM Each query command below is inside a SQMP/EQMP section, do NOT change
2049 HXCOMM this! We will possibly move query commands definitions inside those
2050 HXCOMM sections, just like regular commands.
2051
2052 EQMP
2053
2054 SQMP
2055 query-version
2056 -------------
2057
2058 Show QEMU version.
2059
2060 Return a json-object with the following information:
2061
2062 - "qemu": A json-object containing three integer values:
2063     - "major": QEMU's major version (json-int)
2064     - "minor": QEMU's minor version (json-int)
2065     - "micro": QEMU's micro version (json-int)
2066 - "package": package's version (json-string)
2067
2068 Example:
2069
2070 -> { "execute": "query-version" }
2071 <- {
2072       "return":{
2073          "qemu":{
2074             "major":0,
2075             "minor":11,
2076             "micro":5
2077          },
2078          "package":""
2079       }
2080    }
2081
2082 EQMP
2083
2084     {
2085         .name       = "query-version",
2086         .args_type  = "",
2087         .mhandler.cmd_new = qmp_marshal_input_query_version,
2088     },
2089
2090 SQMP
2091 query-commands
2092 --------------
2093
2094 List QMP available commands.
2095
2096 Each command is represented by a json-object, the returned value is a json-array
2097 of all commands.
2098
2099 Each json-object contain:
2100
2101 - "name": command's name (json-string)
2102
2103 Example:
2104
2105 -> { "execute": "query-commands" }
2106 <- {
2107       "return":[
2108          {
2109             "name":"query-balloon"
2110          },
2111          {
2112             "name":"system_powerdown"
2113          }
2114       ]
2115    }
2116
2117 Note: This example has been shortened as the real response is too long.
2118
2119 EQMP
2120
2121     {
2122         .name       = "query-commands",
2123         .args_type  = "",
2124         .mhandler.cmd_new = qmp_marshal_input_query_commands,
2125     },
2126
2127 SQMP
2128 query-events
2129 --------------
2130
2131 List QMP available events.
2132
2133 Each event is represented by a json-object, the returned value is a json-array
2134 of all events.
2135
2136 Each json-object contains:
2137
2138 - "name": event's name (json-string)
2139
2140 Example:
2141
2142 -> { "execute": "query-events" }
2143 <- {
2144       "return":[
2145          {
2146             "name":"SHUTDOWN"
2147          },
2148          {
2149             "name":"RESET"
2150          }
2151       ]
2152    }
2153
2154 Note: This example has been shortened as the real response is too long.
2155
2156 EQMP
2157
2158     {
2159         .name       = "query-events",
2160         .args_type  = "",
2161         .mhandler.cmd_new = qmp_marshal_input_query_events,
2162     },
2163
2164 SQMP
2165 query-chardev
2166 -------------
2167
2168 Each device is represented by a json-object. The returned value is a json-array
2169 of all devices.
2170
2171 Each json-object contain the following:
2172
2173 - "label": device's label (json-string)
2174 - "filename": device's file (json-string)
2175 - "frontend-open": open/closed state of the frontend device attached to this
2176                    backend (json-bool)
2177
2178 Example:
2179
2180 -> { "execute": "query-chardev" }
2181 <- {
2182       "return": [
2183          {
2184             "label": "charchannel0",
2185             "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.agent,server",
2186             "frontend-open": false
2187          },
2188          {
2189             "label": "charmonitor",
2190             "filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.monitor,server",
2191             "frontend-open": true
2192          },
2193          {
2194             "label": "charserial0",
2195             "filename": "pty:/dev/pts/2",
2196             "frontend-open": true
2197          }
2198       ]
2199    }
2200
2201 EQMP
2202
2203     {
2204         .name       = "query-chardev",
2205         .args_type  = "",
2206         .mhandler.cmd_new = qmp_marshal_input_query_chardev,
2207     },
2208
2209 SQMP
2210 query-chardev-backends
2211 -------------
2212
2213 List available character device backends.
2214
2215 Each backend is represented by a json-object, the returned value is a json-array
2216 of all backends.
2217
2218 Each json-object contains:
2219
2220 - "name": backend name (json-string)
2221
2222 Example:
2223
2224 -> { "execute": "query-chardev-backends" }
2225 <- {
2226       "return":[
2227          {
2228             "name":"udp"
2229          },
2230          {
2231             "name":"tcp"
2232          },
2233          {
2234             "name":"unix"
2235          },
2236          {
2237             "name":"spiceport"
2238          }
2239       ]
2240    }
2241
2242 EQMP
2243
2244     {
2245         .name       = "query-chardev-backends",
2246         .args_type  = "",
2247         .mhandler.cmd_new = qmp_marshal_input_query_chardev_backends,
2248     },
2249
2250 SQMP
2251 query-block
2252 -----------
2253
2254 Show the block devices.
2255
2256 Each block device information is stored in a json-object and the returned value
2257 is a json-array of all devices.
2258
2259 Each json-object contain the following:
2260
2261 - "device": device name (json-string)
2262 - "type": device type (json-string)
2263          - deprecated, retained for backward compatibility
2264          - Possible values: "unknown"
2265 - "removable": true if the device is removable, false otherwise (json-bool)
2266 - "locked": true if the device is locked, false otherwise (json-bool)
2267 - "tray_open": only present if removable, true if the device has a tray,
2268                and it is open (json-bool)
2269 - "inserted": only present if the device is inserted, it is a json-object
2270    containing the following:
2271          - "file": device file name (json-string)
2272          - "ro": true if read-only, false otherwise (json-bool)
2273          - "drv": driver format name (json-string)
2274              - Possible values: "blkdebug", "bochs", "cloop", "dmg",
2275                                 "file", "file", "ftp", "ftps", "host_cdrom",
2276                                 "host_device", "http", "https",
2277                                 "nbd", "parallels", "qcow", "qcow2", "raw",
2278                                 "tftp", "vdi", "vmdk", "vpc", "vvfat"
2279          - "backing_file": backing file name (json-string, optional)
2280          - "backing_file_depth": number of files in the backing file chain (json-int)
2281          - "encrypted": true if encrypted, false otherwise (json-bool)
2282          - "bps": limit total bytes per second (json-int)
2283          - "bps_rd": limit read bytes per second (json-int)
2284          - "bps_wr": limit write bytes per second (json-int)
2285          - "iops": limit total I/O operations per second (json-int)
2286          - "iops_rd": limit read operations per second (json-int)
2287          - "iops_wr": limit write operations per second (json-int)
2288          - "bps_max":  total max in bytes (json-int)
2289          - "bps_rd_max":  read max in bytes (json-int)
2290          - "bps_wr_max":  write max in bytes (json-int)
2291          - "iops_max":  total I/O operations max (json-int)
2292          - "iops_rd_max":  read I/O operations max (json-int)
2293          - "iops_wr_max":  write I/O operations max (json-int)
2294          - "iops_size": I/O size when limiting by iops (json-int)
2295          - "detect_zeroes": detect and optimize zero writing (json-string)
2296              - Possible values: "off", "on", "unmap"
2297          - "write_threshold": write offset threshold in bytes, a event will be
2298                               emitted if crossed. Zero if disabled (json-int)
2299          - "image": the detail of the image, it is a json-object containing
2300             the following:
2301              - "filename": image file name (json-string)
2302              - "format": image format (json-string)
2303              - "virtual-size": image capacity in bytes (json-int)
2304              - "dirty-flag": true if image is not cleanly closed, not present
2305                              means clean (json-bool, optional)
2306              - "actual-size": actual size on disk in bytes of the image, not
2307                               present when image does not support thin
2308                               provision (json-int, optional)
2309              - "cluster-size": size of a cluster in bytes, not present if image
2310                                format does not support it (json-int, optional)
2311              - "encrypted": true if the image is encrypted, not present means
2312                             false or the image format does not support
2313                             encryption (json-bool, optional)
2314              - "backing_file": backing file name, not present means no backing
2315                                file is used or the image format does not
2316                                support backing file chain
2317                                (json-string, optional)
2318              - "full-backing-filename": full path of the backing file, not
2319                                         present if it equals backing_file or no
2320                                         backing file is used
2321                                         (json-string, optional)
2322              - "backing-filename-format": the format of the backing file, not
2323                                           present means unknown or no backing
2324                                           file (json-string, optional)
2325              - "snapshots": the internal snapshot info, it is an optional list
2326                 of json-object containing the following:
2327                  - "id": unique snapshot id (json-string)
2328                  - "name": snapshot name (json-string)
2329                  - "vm-state-size": size of the VM state in bytes (json-int)
2330                  - "date-sec": UTC date of the snapshot in seconds (json-int)
2331                  - "date-nsec": fractional part in nanoseconds to be used with
2332                                 date-sec (json-int)
2333                  - "vm-clock-sec": VM clock relative to boot in seconds
2334                                    (json-int)
2335                  - "vm-clock-nsec": fractional part in nanoseconds to be used
2336                                     with vm-clock-sec (json-int)
2337              - "backing-image": the detail of the backing image, it is an
2338                                 optional json-object only present when a
2339                                 backing image present for this image
2340
2341 - "io-status": I/O operation status, only present if the device supports it
2342                and the VM is configured to stop on errors. It's always reset
2343                to "ok" when the "cont" command is issued (json_string, optional)
2344              - Possible values: "ok", "failed", "nospace"
2345
2346 Example:
2347
2348 -> { "execute": "query-block" }
2349 <- {
2350       "return":[
2351          {
2352             "io-status": "ok",
2353             "device":"ide0-hd0",
2354             "locked":false,
2355             "removable":false,
2356             "inserted":{
2357                "ro":false,
2358                "drv":"qcow2",
2359                "encrypted":false,
2360                "file":"disks/test.qcow2",
2361                "backing_file_depth":1,
2362                "bps":1000000,
2363                "bps_rd":0,
2364                "bps_wr":0,
2365                "iops":1000000,
2366                "iops_rd":0,
2367                "iops_wr":0,
2368                "bps_max": 8000000,
2369                "bps_rd_max": 0,
2370                "bps_wr_max": 0,
2371                "iops_max": 0,
2372                "iops_rd_max": 0,
2373                "iops_wr_max": 0,
2374                "iops_size": 0,
2375                "detect_zeroes": "on",
2376                "write_threshold": 0,
2377                "image":{
2378                   "filename":"disks/test.qcow2",
2379                   "format":"qcow2",
2380                   "virtual-size":2048000,
2381                   "backing_file":"base.qcow2",
2382                   "full-backing-filename":"disks/base.qcow2",
2383                   "backing-filename-format:"qcow2",
2384                   "snapshots":[
2385                      {
2386                         "id": "1",
2387                         "name": "snapshot1",
2388                         "vm-state-size": 0,
2389                         "date-sec": 10000200,
2390                         "date-nsec": 12,
2391                         "vm-clock-sec": 206,
2392                         "vm-clock-nsec": 30
2393                      }
2394                   ],
2395                   "backing-image":{
2396                       "filename":"disks/base.qcow2",
2397                       "format":"qcow2",
2398                       "virtual-size":2048000
2399                   }
2400                }
2401             },
2402             "type":"unknown"
2403          },
2404          {
2405             "io-status": "ok",
2406             "device":"ide1-cd0",
2407             "locked":false,
2408             "removable":true,
2409             "type":"unknown"
2410          },
2411          {
2412             "device":"floppy0",
2413             "locked":false,
2414             "removable":true,
2415             "type":"unknown"
2416          },
2417          {
2418             "device":"sd0",
2419             "locked":false,
2420             "removable":true,
2421             "type":"unknown"
2422          }
2423       ]
2424    }
2425
2426 EQMP
2427
2428     {
2429         .name       = "query-block",
2430         .args_type  = "",
2431         .mhandler.cmd_new = qmp_marshal_input_query_block,
2432     },
2433
2434 SQMP
2435 query-blockstats
2436 ----------------
2437
2438 Show block device statistics.
2439
2440 Each device statistic information is stored in a json-object and the returned
2441 value is a json-array of all devices.
2442
2443 Each json-object contain the following:
2444
2445 - "device": device name (json-string)
2446 - "stats": A json-object with the statistics information, it contains:
2447     - "rd_bytes": bytes read (json-int)
2448     - "wr_bytes": bytes written (json-int)
2449     - "rd_operations": read operations (json-int)
2450     - "wr_operations": write operations (json-int)
2451     - "flush_operations": cache flush operations (json-int)
2452     - "wr_total_time_ns": total time spend on writes in nano-seconds (json-int)
2453     - "rd_total_time_ns": total time spend on reads in nano-seconds (json-int)
2454     - "flush_total_time_ns": total time spend on cache flushes in nano-seconds (json-int)
2455     - "wr_highest_offset": Highest offset of a sector written since the
2456                            BlockDriverState has been opened (json-int)
2457     - "rd_merged": number of read requests that have been merged into
2458                    another request (json-int)
2459     - "wr_merged": number of write requests that have been merged into
2460                    another request (json-int)
2461 - "parent": Contains recursively the statistics of the underlying
2462             protocol (e.g. the host file for a qcow2 image). If there is
2463             no underlying protocol, this field is omitted
2464             (json-object, optional)
2465
2466 Example:
2467
2468 -> { "execute": "query-blockstats" }
2469 <- {
2470       "return":[
2471          {
2472             "device":"ide0-hd0",
2473             "parent":{
2474                "stats":{
2475                   "wr_highest_offset":3686448128,
2476                   "wr_bytes":9786368,
2477                   "wr_operations":751,
2478                   "rd_bytes":122567168,
2479                   "rd_operations":36772
2480                   "wr_total_times_ns":313253456
2481                   "rd_total_times_ns":3465673657
2482                   "flush_total_times_ns":49653
2483                   "flush_operations":61,
2484                   "rd_merged":0,
2485                   "wr_merged":0
2486                }
2487             },
2488             "stats":{
2489                "wr_highest_offset":2821110784,
2490                "wr_bytes":9786368,
2491                "wr_operations":692,
2492                "rd_bytes":122739200,
2493                "rd_operations":36604
2494                "flush_operations":51,
2495                "wr_total_times_ns":313253456
2496                "rd_total_times_ns":3465673657
2497                "flush_total_times_ns":49653,
2498                "rd_merged":0,
2499                "wr_merged":0
2500             }
2501          },
2502          {
2503             "device":"ide1-cd0",
2504             "stats":{
2505                "wr_highest_offset":0,
2506                "wr_bytes":0,
2507                "wr_operations":0,
2508                "rd_bytes":0,
2509                "rd_operations":0
2510                "flush_operations":0,
2511                "wr_total_times_ns":0
2512                "rd_total_times_ns":0
2513                "flush_total_times_ns":0,
2514                "rd_merged":0,
2515                "wr_merged":0
2516             }
2517          },
2518          {
2519             "device":"floppy0",
2520             "stats":{
2521                "wr_highest_offset":0,
2522                "wr_bytes":0,
2523                "wr_operations":0,
2524                "rd_bytes":0,
2525                "rd_operations":0
2526                "flush_operations":0,
2527                "wr_total_times_ns":0
2528                "rd_total_times_ns":0
2529                "flush_total_times_ns":0,
2530                "rd_merged":0,
2531                "wr_merged":0
2532             }
2533          },
2534          {
2535             "device":"sd0",
2536             "stats":{
2537                "wr_highest_offset":0,
2538                "wr_bytes":0,
2539                "wr_operations":0,
2540                "rd_bytes":0,
2541                "rd_operations":0
2542                "flush_operations":0,
2543                "wr_total_times_ns":0
2544                "rd_total_times_ns":0
2545                "flush_total_times_ns":0,
2546                "rd_merged":0,
2547                "wr_merged":0
2548             }
2549          }
2550       ]
2551    }
2552
2553 EQMP
2554
2555     {
2556         .name       = "query-blockstats",
2557         .args_type  = "query-nodes:b?",
2558         .mhandler.cmd_new = qmp_marshal_input_query_blockstats,
2559     },
2560
2561 SQMP
2562 query-cpus
2563 ----------
2564
2565 Show CPU information.
2566
2567 Return a json-array. Each CPU is represented by a json-object, which contains:
2568
2569 - "CPU": CPU index (json-int)
2570 - "current": true if this is the current CPU, false otherwise (json-bool)
2571 - "halted": true if the cpu is halted, false otherwise (json-bool)
2572 - Current program counter. The key's name depends on the architecture:
2573      "pc": i386/x86_64 (json-int)
2574      "nip": PPC (json-int)
2575      "pc" and "npc": sparc (json-int)
2576      "PC": mips (json-int)
2577 - "thread_id": ID of the underlying host thread (json-int)
2578
2579 Example:
2580
2581 -> { "execute": "query-cpus" }
2582 <- {
2583       "return":[
2584          {
2585             "CPU":0,
2586             "current":true,
2587             "halted":false,
2588             "pc":3227107138
2589             "thread_id":3134
2590          },
2591          {
2592             "CPU":1,
2593             "current":false,
2594             "halted":true,
2595             "pc":7108165
2596             "thread_id":3135
2597          }
2598       ]
2599    }
2600
2601 EQMP
2602
2603     {
2604         .name       = "query-cpus",
2605         .args_type  = "",
2606         .mhandler.cmd_new = qmp_marshal_input_query_cpus,
2607     },
2608
2609 SQMP
2610 query-iothreads
2611 ---------------
2612
2613 Returns a list of information about each iothread.
2614
2615 Note this list excludes the QEMU main loop thread, which is not declared
2616 using the -object iothread command-line option.  It is always the main thread
2617 of the process.
2618
2619 Return a json-array. Each iothread is represented by a json-object, which contains:
2620
2621 - "id": name of iothread (json-str)
2622 - "thread-id": ID of the underlying host thread (json-int)
2623
2624 Example:
2625
2626 -> { "execute": "query-iothreads" }
2627 <- {
2628       "return":[
2629          {
2630             "id":"iothread0",
2631             "thread-id":3134
2632          },
2633          {
2634             "id":"iothread1",
2635             "thread-id":3135
2636          }
2637       ]
2638    }
2639
2640 EQMP
2641
2642     {
2643         .name       = "query-iothreads",
2644         .args_type  = "",
2645         .mhandler.cmd_new = qmp_marshal_input_query_iothreads,
2646     },
2647
2648 SQMP
2649 query-pci
2650 ---------
2651
2652 PCI buses and devices information.
2653
2654 The returned value is a json-array of all buses. Each bus is represented by
2655 a json-object, which has a key with a json-array of all PCI devices attached
2656 to it. Each device is represented by a json-object.
2657
2658 The bus json-object contains the following:
2659
2660 - "bus": bus number (json-int)
2661 - "devices": a json-array of json-objects, each json-object represents a
2662              PCI device
2663
2664 The PCI device json-object contains the following:
2665
2666 - "bus": identical to the parent's bus number (json-int)
2667 - "slot": slot number (json-int)
2668 - "function": function number (json-int)
2669 - "class_info": a json-object containing:
2670      - "desc": device class description (json-string, optional)
2671      - "class": device class number (json-int)
2672 - "id": a json-object containing:
2673      - "device": device ID (json-int)
2674      - "vendor": vendor ID (json-int)
2675 - "irq": device's IRQ if assigned (json-int, optional)
2676 - "qdev_id": qdev id string (json-string)
2677 - "pci_bridge": It's a json-object, only present if this device is a
2678                 PCI bridge, contains:
2679      - "bus": bus number (json-int)
2680      - "secondary": secondary bus number (json-int)
2681      - "subordinate": subordinate bus number (json-int)
2682      - "io_range": I/O memory range information, a json-object with the
2683                    following members:
2684                  - "base": base address, in bytes (json-int)
2685                  - "limit": limit address, in bytes (json-int)
2686      - "memory_range": memory range information, a json-object with the
2687                        following members:
2688                  - "base": base address, in bytes (json-int)
2689                  - "limit": limit address, in bytes (json-int)
2690      - "prefetchable_range": Prefetchable memory range information, a
2691                              json-object with the following members:
2692                  - "base": base address, in bytes (json-int)
2693                  - "limit": limit address, in bytes (json-int)
2694      - "devices": a json-array of PCI devices if there's any attached, each
2695                   each element is represented by a json-object, which contains
2696                   the same members of the 'PCI device json-object' described
2697                   above (optional)
2698 - "regions": a json-array of json-objects, each json-object represents a
2699              memory region of this device
2700
2701 The memory range json-object contains the following:
2702
2703 - "base": base memory address (json-int)
2704 - "limit": limit value (json-int)
2705
2706 The region json-object can be an I/O region or a memory region, an I/O region
2707 json-object contains the following:
2708
2709 - "type": "io" (json-string, fixed)
2710 - "bar": BAR number (json-int)
2711 - "address": memory address (json-int)
2712 - "size": memory size (json-int)
2713
2714 A memory region json-object contains the following:
2715
2716 - "type": "memory" (json-string, fixed)
2717 - "bar": BAR number (json-int)
2718 - "address": memory address (json-int)
2719 - "size": memory size (json-int)
2720 - "mem_type_64": true or false (json-bool)
2721 - "prefetch": true or false (json-bool)
2722
2723 Example:
2724
2725 -> { "execute": "query-pci" }
2726 <- {
2727       "return":[
2728          {
2729             "bus":0,
2730             "devices":[
2731                {
2732                   "bus":0,
2733                   "qdev_id":"",
2734                   "slot":0,
2735                   "class_info":{
2736                      "class":1536,
2737                      "desc":"Host bridge"
2738                   },
2739                   "id":{
2740                      "device":32902,
2741                      "vendor":4663
2742                   },
2743                   "function":0,
2744                   "regions":[
2745
2746                   ]
2747                },
2748                {
2749                   "bus":0,
2750                   "qdev_id":"",
2751                   "slot":1,
2752                   "class_info":{
2753                      "class":1537,
2754                      "desc":"ISA bridge"
2755                   },
2756                   "id":{
2757                      "device":32902,
2758                      "vendor":28672
2759                   },
2760                   "function":0,
2761                   "regions":[
2762
2763                   ]
2764                },
2765                {
2766                   "bus":0,
2767                   "qdev_id":"",
2768                   "slot":1,
2769                   "class_info":{
2770                      "class":257,
2771                      "desc":"IDE controller"
2772                   },
2773                   "id":{
2774                      "device":32902,
2775                      "vendor":28688
2776                   },
2777                   "function":1,
2778                   "regions":[
2779                      {
2780                         "bar":4,
2781                         "size":16,
2782                         "address":49152,
2783                         "type":"io"
2784                      }
2785                   ]
2786                },
2787                {
2788                   "bus":0,
2789                   "qdev_id":"",
2790                   "slot":2,
2791                   "class_info":{
2792                      "class":768,
2793                      "desc":"VGA controller"
2794                   },
2795                   "id":{
2796                      "device":4115,
2797                      "vendor":184
2798                   },
2799                   "function":0,
2800                   "regions":[
2801                      {
2802                         "prefetch":true,
2803                         "mem_type_64":false,
2804                         "bar":0,
2805                         "size":33554432,
2806                         "address":4026531840,
2807                         "type":"memory"
2808                      },
2809                      {
2810                         "prefetch":false,
2811                         "mem_type_64":false,
2812                         "bar":1,
2813                         "size":4096,
2814                         "address":4060086272,
2815                         "type":"memory"
2816                      },
2817                      {
2818                         "prefetch":false,
2819                         "mem_type_64":false,
2820                         "bar":6,
2821                         "size":65536,
2822                         "address":-1,
2823                         "type":"memory"
2824                      }
2825                   ]
2826                },
2827                {
2828                   "bus":0,
2829                   "qdev_id":"",
2830                   "irq":11,
2831                   "slot":4,
2832                   "class_info":{
2833                      "class":1280,
2834                      "desc":"RAM controller"
2835                   },
2836                   "id":{
2837                      "device":6900,
2838                      "vendor":4098
2839                   },
2840                   "function":0,
2841                   "regions":[
2842                      {
2843                         "bar":0,
2844                         "size":32,
2845                         "address":49280,
2846                         "type":"io"
2847                      }
2848                   ]
2849                }
2850             ]
2851          }
2852       ]
2853    }
2854
2855 Note: This example has been shortened as the real response is too long.
2856
2857 EQMP
2858
2859     {
2860         .name       = "query-pci",
2861         .args_type  = "",
2862         .mhandler.cmd_new = qmp_marshal_input_query_pci,
2863     },
2864
2865 SQMP
2866 query-kvm
2867 ---------
2868
2869 Show KVM information.
2870
2871 Return a json-object with the following information:
2872
2873 - "enabled": true if KVM support is enabled, false otherwise (json-bool)
2874 - "present": true if QEMU has KVM support, false otherwise (json-bool)
2875
2876 Example:
2877
2878 -> { "execute": "query-kvm" }
2879 <- { "return": { "enabled": true, "present": true } }
2880
2881 EQMP
2882
2883     {
2884         .name       = "query-kvm",
2885         .args_type  = "",
2886         .mhandler.cmd_new = qmp_marshal_input_query_kvm,
2887     },
2888
2889 SQMP
2890 query-status
2891 ------------
2892
2893 Return a json-object with the following information:
2894
2895 - "running": true if the VM is running, or false if it is paused (json-bool)
2896 - "singlestep": true if the VM is in single step mode,
2897                 false otherwise (json-bool)
2898 - "status": one of the following values (json-string)
2899     "debug" - QEMU is running on a debugger
2900     "inmigrate" - guest is paused waiting for an incoming migration
2901     "internal-error" - An internal error that prevents further guest
2902     execution has occurred
2903     "io-error" - the last IOP has failed and the device is configured
2904     to pause on I/O errors
2905     "paused" - guest has been paused via the 'stop' command
2906     "postmigrate" - guest is paused following a successful 'migrate'
2907     "prelaunch" - QEMU was started with -S and guest has not started
2908     "finish-migrate" - guest is paused to finish the migration process
2909     "restore-vm" - guest is paused to restore VM state
2910     "running" - guest is actively running
2911     "save-vm" - guest is paused to save the VM state
2912     "shutdown" - guest is shut down (and -no-shutdown is in use)
2913     "watchdog" - the watchdog action is configured to pause and
2914      has been triggered
2915
2916 Example:
2917
2918 -> { "execute": "query-status" }
2919 <- { "return": { "running": true, "singlestep": false, "status": "running" } }
2920
2921 EQMP
2922
2923     {
2924         .name       = "query-status",
2925         .args_type  = "",
2926         .mhandler.cmd_new = qmp_marshal_input_query_status,
2927     },
2928
2929 SQMP
2930 query-mice
2931 ----------
2932
2933 Show VM mice information.
2934
2935 Each mouse is represented by a json-object, the returned value is a json-array
2936 of all mice.
2937
2938 The mouse json-object contains the following:
2939
2940 - "name": mouse's name (json-string)
2941 - "index": mouse's index (json-int)
2942 - "current": true if this mouse is receiving events, false otherwise (json-bool)
2943 - "absolute": true if the mouse generates absolute input events (json-bool)
2944
2945 Example:
2946
2947 -> { "execute": "query-mice" }
2948 <- {
2949       "return":[
2950          {
2951             "name":"QEMU Microsoft Mouse",
2952             "index":0,
2953             "current":false,
2954             "absolute":false
2955          },
2956          {
2957             "name":"QEMU PS/2 Mouse",
2958             "index":1,
2959             "current":true,
2960             "absolute":true
2961          }
2962       ]
2963    }
2964
2965 EQMP
2966
2967     {
2968         .name       = "query-mice",
2969         .args_type  = "",
2970         .mhandler.cmd_new = qmp_marshal_input_query_mice,
2971     },
2972
2973 SQMP
2974 query-vnc
2975 ---------
2976
2977 Show VNC server information.
2978
2979 Return a json-object with server information. Connected clients are returned
2980 as a json-array of json-objects.
2981
2982 The main json-object contains the following:
2983
2984 - "enabled": true or false (json-bool)
2985 - "host": server's IP address (json-string)
2986 - "family": address family (json-string)
2987          - Possible values: "ipv4", "ipv6", "unix", "unknown"
2988 - "service": server's port number (json-string)
2989 - "auth": authentication method (json-string)
2990          - Possible values: "invalid", "none", "ra2", "ra2ne", "sasl", "tight",
2991                             "tls", "ultra", "unknown", "vencrypt", "vencrypt",
2992                             "vencrypt+plain", "vencrypt+tls+none",
2993                             "vencrypt+tls+plain", "vencrypt+tls+sasl",
2994                             "vencrypt+tls+vnc", "vencrypt+x509+none",
2995                             "vencrypt+x509+plain", "vencrypt+x509+sasl",
2996                             "vencrypt+x509+vnc", "vnc"
2997 - "clients": a json-array of all connected clients
2998
2999 Clients are described by a json-object, each one contain the following:
3000
3001 - "host": client's IP address (json-string)
3002 - "family": address family (json-string)
3003          - Possible values: "ipv4", "ipv6", "unix", "unknown"
3004 - "service": client's port number (json-string)
3005 - "x509_dname": TLS dname (json-string, optional)
3006 - "sasl_username": SASL username (json-string, optional)
3007
3008 Example:
3009
3010 -> { "execute": "query-vnc" }
3011 <- {
3012       "return":{
3013          "enabled":true,
3014          "host":"0.0.0.0",
3015          "service":"50402",
3016          "auth":"vnc",
3017          "family":"ipv4",
3018          "clients":[
3019             {
3020                "host":"127.0.0.1",
3021                "service":"50401",
3022                "family":"ipv4"
3023             }
3024          ]
3025       }
3026    }
3027
3028 EQMP
3029
3030     {
3031         .name       = "query-vnc",
3032         .args_type  = "",
3033         .mhandler.cmd_new = qmp_marshal_input_query_vnc,
3034     },
3035     {
3036         .name       = "query-vnc-servers",
3037         .args_type  = "",
3038         .mhandler.cmd_new = qmp_marshal_input_query_vnc_servers,
3039     },
3040
3041 SQMP
3042 query-spice
3043 -----------
3044
3045 Show SPICE server information.
3046
3047 Return a json-object with server information. Connected clients are returned
3048 as a json-array of json-objects.
3049
3050 The main json-object contains the following:
3051
3052 - "enabled": true or false (json-bool)
3053 - "host": server's IP address (json-string)
3054 - "port": server's port number (json-int, optional)
3055 - "tls-port": server's port number (json-int, optional)
3056 - "auth": authentication method (json-string)
3057          - Possible values: "none", "spice"
3058 - "channels": a json-array of all active channels clients
3059
3060 Channels are described by a json-object, each one contain the following:
3061
3062 - "host": client's IP address (json-string)
3063 - "family": address family (json-string)
3064          - Possible values: "ipv4", "ipv6", "unix", "unknown"
3065 - "port": client's port number (json-string)
3066 - "connection-id": spice connection id.  All channels with the same id
3067                    belong to the same spice session (json-int)
3068 - "channel-type": channel type.  "1" is the main control channel, filter for
3069                   this one if you want track spice sessions only (json-int)
3070 - "channel-id": channel id.  Usually "0", might be different needed when
3071                 multiple channels of the same type exist, such as multiple
3072                 display channels in a multihead setup (json-int)
3073 - "tls": whether the channel is encrypted (json-bool)
3074
3075 Example:
3076
3077 -> { "execute": "query-spice" }
3078 <- {
3079       "return": {
3080          "enabled": true,
3081          "auth": "spice",
3082          "port": 5920,
3083          "tls-port": 5921,
3084          "host": "0.0.0.0",
3085          "channels": [
3086             {
3087                "port": "54924",
3088                "family": "ipv4",
3089                "channel-type": 1,
3090                "connection-id": 1804289383,
3091                "host": "127.0.0.1",
3092                "channel-id": 0,
3093                "tls": true
3094             },
3095             {
3096                "port": "36710",
3097                "family": "ipv4",
3098                "channel-type": 4,
3099                "connection-id": 1804289383,
3100                "host": "127.0.0.1",
3101                "channel-id": 0,
3102                "tls": false
3103             },
3104             [ ... more channels follow ... ]
3105          ]
3106       }
3107    }
3108
3109 EQMP
3110
3111 #if defined(CONFIG_SPICE)
3112     {
3113         .name       = "query-spice",
3114         .args_type  = "",
3115         .mhandler.cmd_new = qmp_marshal_input_query_spice,
3116     },
3117 #endif
3118
3119 SQMP
3120 query-name
3121 ----------
3122
3123 Show VM name.
3124
3125 Return a json-object with the following information:
3126
3127 - "name": VM's name (json-string, optional)
3128
3129 Example:
3130
3131 -> { "execute": "query-name" }
3132 <- { "return": { "name": "qemu-name" } }
3133
3134 EQMP
3135
3136     {
3137         .name       = "query-name",
3138         .args_type  = "",
3139         .mhandler.cmd_new = qmp_marshal_input_query_name,
3140     },
3141
3142 SQMP
3143 query-uuid
3144 ----------
3145
3146 Show VM UUID.
3147
3148 Return a json-object with the following information:
3149
3150 - "UUID": Universally Unique Identifier (json-string)
3151
3152 Example:
3153
3154 -> { "execute": "query-uuid" }
3155 <- { "return": { "UUID": "550e8400-e29b-41d4-a716-446655440000" } }
3156
3157 EQMP
3158
3159     {
3160         .name       = "query-uuid",
3161         .args_type  = "",
3162         .mhandler.cmd_new = qmp_marshal_input_query_uuid,
3163     },
3164
3165 SQMP
3166 query-command-line-options
3167 --------------------------
3168
3169 Show command line option schema.
3170
3171 Return a json-array of command line option schema for all options (or for
3172 the given option), returning an error if the given option doesn't exist.
3173
3174 Each array entry contains the following:
3175
3176 - "option": option name (json-string)
3177 - "parameters": a json-array describes all parameters of the option:
3178     - "name": parameter name (json-string)
3179     - "type": parameter type (one of 'string', 'boolean', 'number',
3180               or 'size')
3181     - "help": human readable description of the parameter
3182               (json-string, optional)
3183     - "default": default value string for the parameter
3184                  (json-string, optional)
3185
3186 Example:
3187
3188 -> { "execute": "query-command-line-options", "arguments": { "option": "option-rom" } }
3189 <- { "return": [
3190         {
3191             "parameters": [
3192                 {
3193                     "name": "romfile",
3194                     "type": "string"
3195                 },
3196                 {
3197                     "name": "bootindex",
3198                     "type": "number"
3199                 }
3200             ],
3201             "option": "option-rom"
3202         }
3203      ]
3204    }
3205
3206 EQMP
3207
3208     {
3209         .name       = "query-command-line-options",
3210         .args_type  = "option:s?",
3211         .mhandler.cmd_new = qmp_marshal_input_query_command_line_options,
3212     },
3213
3214 SQMP
3215 query-migrate
3216 -------------
3217
3218 Migration status.
3219
3220 Return a json-object. If migration is active there will be another json-object
3221 with RAM migration status and if block migration is active another one with
3222 block migration status.
3223
3224 The main json-object contains the following:
3225
3226 - "status": migration status (json-string)
3227      - Possible values: "setup", "active", "completed", "failed", "cancelled"
3228 - "total-time": total amount of ms since migration started.  If
3229                 migration has ended, it returns the total migration
3230                 time (json-int)
3231 - "setup-time" amount of setup time in milliseconds _before_ the
3232                iterations begin but _after_ the QMP command is issued.
3233                This is designed to provide an accounting of any activities
3234                (such as RDMA pinning) which may be expensive, but do not
3235                actually occur during the iterative migration rounds
3236                themselves. (json-int)
3237 - "downtime": only present when migration has finished correctly
3238               total amount in ms for downtime that happened (json-int)
3239 - "expected-downtime": only present while migration is active
3240                 total amount in ms for downtime that was calculated on
3241                 the last bitmap round (json-int)
3242 - "ram": only present if "status" is "active", it is a json-object with the
3243   following RAM information:
3244          - "transferred": amount transferred in bytes (json-int)
3245          - "remaining": amount remaining to transfer in bytes (json-int)
3246          - "total": total amount of memory in bytes (json-int)
3247          - "duplicate": number of pages filled entirely with the same
3248             byte (json-int)
3249             These are sent over the wire much more efficiently.
3250          - "skipped": number of skipped zero pages (json-int)
3251          - "normal" : number of whole pages transferred.  I.e. they
3252             were not sent as duplicate or xbzrle pages (json-int)
3253          - "normal-bytes" : number of bytes transferred in whole
3254             pages. This is just normal pages times size of one page,
3255             but this way upper levels don't need to care about page
3256             size (json-int)
3257          - "dirty-sync-count": times that dirty ram was synchronized (json-int)
3258 - "disk": only present if "status" is "active" and it is a block migration,
3259   it is a json-object with the following disk information:
3260          - "transferred": amount transferred in bytes (json-int)
3261          - "remaining": amount remaining to transfer in bytes json-int)
3262          - "total": total disk size in bytes (json-int)
3263 - "xbzrle-cache": only present if XBZRLE is active.
3264   It is a json-object with the following XBZRLE information:
3265          - "cache-size": XBZRLE cache size in bytes
3266          - "bytes": number of bytes transferred for XBZRLE compressed pages
3267          - "pages": number of XBZRLE compressed pages
3268          - "cache-miss": number of XBRZRLE page cache misses
3269          - "cache-miss-rate": rate of XBRZRLE page cache misses
3270          - "overflow": number of times XBZRLE overflows.  This means
3271            that the XBZRLE encoding was bigger than just sent the
3272            whole page, and then we sent the whole page instead (as as
3273            normal page).
3274
3275 Examples:
3276
3277 1. Before the first migration
3278
3279 -> { "execute": "query-migrate" }
3280 <- { "return": {} }
3281
3282 2. Migration is done and has succeeded
3283
3284 -> { "execute": "query-migrate" }
3285 <- { "return": {
3286         "status": "completed",
3287         "ram":{
3288           "transferred":123,
3289           "remaining":123,
3290           "total":246,
3291           "total-time":12345,
3292           "setup-time":12345,
3293           "downtime":12345,
3294           "duplicate":123,
3295           "normal":123,
3296           "normal-bytes":123456,
3297           "dirty-sync-count":15
3298         }
3299      }
3300    }
3301
3302 3. Migration is done and has failed
3303
3304 -> { "execute": "query-migrate" }
3305 <- { "return": { "status": "failed" } }
3306
3307 4. Migration is being performed and is not a block migration:
3308
3309 -> { "execute": "query-migrate" }
3310 <- {
3311       "return":{
3312          "status":"active",
3313          "ram":{
3314             "transferred":123,
3315             "remaining":123,
3316             "total":246,
3317             "total-time":12345,
3318             "setup-time":12345,
3319             "expected-downtime":12345,
3320             "duplicate":123,
3321             "normal":123,
3322             "normal-bytes":123456,
3323             "dirty-sync-count":15
3324          }
3325       }
3326    }
3327
3328 5. Migration is being performed and is a block migration:
3329
3330 -> { "execute": "query-migrate" }
3331 <- {
3332       "return":{
3333          "status":"active",
3334          "ram":{
3335             "total":1057024,
3336             "remaining":1053304,
3337             "transferred":3720,
3338             "total-time":12345,
3339             "setup-time":12345,
3340             "expected-downtime":12345,
3341             "duplicate":123,
3342             "normal":123,
3343             "normal-bytes":123456,
3344             "dirty-sync-count":15
3345          },
3346          "disk":{
3347             "total":20971520,
3348             "remaining":20880384,
3349             "transferred":91136
3350          }
3351       }
3352    }
3353
3354 6. Migration is being performed and XBZRLE is active:
3355
3356 -> { "execute": "query-migrate" }
3357 <- {
3358       "return":{
3359          "status":"active",
3360          "capabilities" : [ { "capability": "xbzrle", "state" : true } ],
3361          "ram":{
3362             "total":1057024,
3363             "remaining":1053304,
3364             "transferred":3720,
3365             "total-time":12345,
3366             "setup-time":12345,
3367             "expected-downtime":12345,
3368             "duplicate":10,
3369             "normal":3333,
3370             "normal-bytes":3412992,
3371             "dirty-sync-count":15
3372          },
3373          "xbzrle-cache":{
3374             "cache-size":67108864,
3375             "bytes":20971520,
3376             "pages":2444343,
3377             "cache-miss":2244,
3378             "cache-miss-rate":0.123,
3379             "overflow":34434
3380          }
3381       }
3382    }
3383
3384 EQMP
3385
3386     {
3387         .name       = "query-migrate",
3388         .args_type  = "",
3389         .mhandler.cmd_new = qmp_marshal_input_query_migrate,
3390     },
3391
3392 SQMP
3393 migrate-set-capabilities
3394 ------------------------
3395
3396 Enable/Disable migration capabilities
3397
3398 - "xbzrle": XBZRLE support
3399 - "rdma-pin-all": pin all pages when using RDMA during migration
3400 - "auto-converge": throttle down guest to help convergence of migration
3401 - "zero-blocks": compress zero blocks during block migration
3402
3403 Arguments:
3404
3405 Example:
3406
3407 -> { "execute": "migrate-set-capabilities" , "arguments":
3408      { "capabilities": [ { "capability": "xbzrle", "state": true } ] } }
3409
3410 EQMP
3411
3412     {
3413         .name       = "migrate-set-capabilities",
3414         .args_type  = "capabilities:q",
3415         .params     = "capability:s,state:b",
3416         .mhandler.cmd_new = qmp_marshal_input_migrate_set_capabilities,
3417     },
3418 SQMP
3419 query-migrate-capabilities
3420 --------------------------
3421
3422 Query current migration capabilities
3423
3424 - "capabilities": migration capabilities state
3425          - "xbzrle" : XBZRLE state (json-bool)
3426          - "rdma-pin-all" : RDMA Pin Page state (json-bool)
3427          - "auto-converge" : Auto Converge state (json-bool)
3428          - "zero-blocks" : Zero Blocks state (json-bool)
3429
3430 Arguments:
3431
3432 Example:
3433
3434 -> { "execute": "query-migrate-capabilities" }
3435 <- { "return": [ { "state": false, "capability": "xbzrle" } ] }
3436
3437 EQMP
3438
3439     {
3440         .name       = "query-migrate-capabilities",
3441         .args_type  = "",
3442         .mhandler.cmd_new = qmp_marshal_input_query_migrate_capabilities,
3443     },
3444
3445 SQMP
3446 query-balloon
3447 -------------
3448
3449 Show balloon information.
3450
3451 Make an asynchronous request for balloon info. When the request completes a
3452 json-object will be returned containing the following data:
3453
3454 - "actual": current balloon value in bytes (json-int)
3455
3456 Example:
3457
3458 -> { "execute": "query-balloon" }
3459 <- {
3460       "return":{
3461          "actual":1073741824,
3462       }
3463    }
3464
3465 EQMP
3466
3467     {
3468         .name       = "query-balloon",
3469         .args_type  = "",
3470         .mhandler.cmd_new = qmp_marshal_input_query_balloon,
3471     },
3472
3473     {
3474         .name       = "query-block-jobs",
3475         .args_type  = "",
3476         .mhandler.cmd_new = qmp_marshal_input_query_block_jobs,
3477     },
3478
3479     {
3480         .name       = "qom-list",
3481         .args_type  = "path:s",
3482         .mhandler.cmd_new = qmp_marshal_input_qom_list,
3483     },
3484
3485     {
3486         .name       = "qom-set",
3487         .args_type  = "path:s,property:s,value:q",
3488         .mhandler.cmd_new = qmp_qom_set,
3489     },
3490
3491     {
3492         .name       = "qom-get",
3493         .args_type  = "path:s,property:s",
3494         .mhandler.cmd_new = qmp_qom_get,
3495     },
3496
3497     {
3498         .name       = "nbd-server-start",
3499         .args_type  = "addr:q",
3500         .mhandler.cmd_new = qmp_marshal_input_nbd_server_start,
3501     },
3502     {
3503         .name       = "nbd-server-add",
3504         .args_type  = "device:B,writable:b?",
3505         .mhandler.cmd_new = qmp_marshal_input_nbd_server_add,
3506     },
3507     {
3508         .name       = "nbd-server-stop",
3509         .args_type  = "",
3510         .mhandler.cmd_new = qmp_marshal_input_nbd_server_stop,
3511     },
3512
3513     {
3514         .name       = "change-vnc-password",
3515         .args_type  = "password:s",
3516         .mhandler.cmd_new = qmp_marshal_input_change_vnc_password,
3517     },
3518     {
3519         .name       = "qom-list-types",
3520         .args_type  = "implements:s?,abstract:b?",
3521         .mhandler.cmd_new = qmp_marshal_input_qom_list_types,
3522     },
3523
3524     {
3525         .name       = "device-list-properties",
3526         .args_type  = "typename:s",
3527         .mhandler.cmd_new = qmp_marshal_input_device_list_properties,
3528     },
3529
3530     {
3531         .name       = "query-machines",
3532         .args_type  = "",
3533         .mhandler.cmd_new = qmp_marshal_input_query_machines,
3534     },
3535
3536     {
3537         .name       = "query-cpu-definitions",
3538         .args_type  = "",
3539         .mhandler.cmd_new = qmp_marshal_input_query_cpu_definitions,
3540     },
3541
3542     {
3543         .name       = "query-target",
3544         .args_type  = "",
3545         .mhandler.cmd_new = qmp_marshal_input_query_target,
3546     },
3547
3548     {
3549         .name       = "query-tpm",
3550         .args_type  = "",
3551         .mhandler.cmd_new = qmp_marshal_input_query_tpm,
3552     },
3553
3554 SQMP
3555 query-tpm
3556 ---------
3557
3558 Return information about the TPM device.
3559
3560 Arguments: None
3561
3562 Example:
3563
3564 -> { "execute": "query-tpm" }
3565 <- { "return":
3566      [
3567        { "model": "tpm-tis",
3568          "options":
3569            { "type": "passthrough",
3570              "data":
3571                { "cancel-path": "/sys/class/misc/tpm0/device/cancel",
3572                  "path": "/dev/tpm0"
3573                }
3574            },
3575          "id": "tpm0"
3576        }
3577      ]
3578    }
3579
3580 EQMP
3581
3582     {
3583         .name       = "query-tpm-models",
3584         .args_type  = "",
3585         .mhandler.cmd_new = qmp_marshal_input_query_tpm_models,
3586     },
3587
3588 SQMP
3589 query-tpm-models
3590 ----------------
3591
3592 Return a list of supported TPM models.
3593
3594 Arguments: None
3595
3596 Example:
3597
3598 -> { "execute": "query-tpm-models" }
3599 <- { "return": [ "tpm-tis" ] }
3600
3601 EQMP
3602
3603     {
3604         .name       = "query-tpm-types",
3605         .args_type  = "",
3606         .mhandler.cmd_new = qmp_marshal_input_query_tpm_types,
3607     },
3608
3609 SQMP
3610 query-tpm-types
3611 ---------------
3612
3613 Return a list of supported TPM types.
3614
3615 Arguments: None
3616
3617 Example:
3618
3619 -> { "execute": "query-tpm-types" }
3620 <- { "return": [ "passthrough" ] }
3621
3622 EQMP
3623
3624     {
3625         .name       = "chardev-add",
3626         .args_type  = "id:s,backend:q",
3627         .mhandler.cmd_new = qmp_marshal_input_chardev_add,
3628     },
3629
3630 SQMP
3631 chardev-add
3632 ----------------
3633
3634 Add a chardev.
3635
3636 Arguments:
3637
3638 - "id": the chardev's ID, must be unique (json-string)
3639 - "backend": chardev backend type + parameters
3640
3641 Examples:
3642
3643 -> { "execute" : "chardev-add",
3644      "arguments" : { "id" : "foo",
3645                      "backend" : { "type" : "null", "data" : {} } } }
3646 <- { "return": {} }
3647
3648 -> { "execute" : "chardev-add",
3649      "arguments" : { "id" : "bar",
3650                      "backend" : { "type" : "file",
3651                                    "data" : { "out" : "/tmp/bar.log" } } } }
3652 <- { "return": {} }
3653
3654 -> { "execute" : "chardev-add",
3655      "arguments" : { "id" : "baz",
3656                      "backend" : { "type" : "pty", "data" : {} } } }
3657 <- { "return": { "pty" : "/dev/pty/42" } }
3658
3659 EQMP
3660
3661     {
3662         .name       = "chardev-remove",
3663         .args_type  = "id:s",
3664         .mhandler.cmd_new = qmp_marshal_input_chardev_remove,
3665     },
3666
3667
3668 SQMP
3669 chardev-remove
3670 --------------
3671
3672 Remove a chardev.
3673
3674 Arguments:
3675
3676 - "id": the chardev's ID, must exist and not be in use (json-string)
3677
3678 Example:
3679
3680 -> { "execute": "chardev-remove", "arguments": { "id" : "foo" } }
3681 <- { "return": {} }
3682
3683 EQMP
3684     {
3685         .name       = "query-rx-filter",
3686         .args_type  = "name:s?",
3687         .mhandler.cmd_new = qmp_marshal_input_query_rx_filter,
3688     },
3689
3690 SQMP
3691 query-rx-filter
3692 ---------------
3693
3694 Show rx-filter information.
3695
3696 Returns a json-array of rx-filter information for all NICs (or for the
3697 given NIC), returning an error if the given NIC doesn't exist, or
3698 given NIC doesn't support rx-filter querying, or given net client
3699 isn't a NIC.
3700
3701 The query will clear the event notification flag of each NIC, then qemu
3702 will start to emit event to QMP monitor.
3703
3704 Each array entry contains the following:
3705
3706 - "name": net client name (json-string)
3707 - "promiscuous": promiscuous mode is enabled (json-bool)
3708 - "multicast": multicast receive state (one of 'normal', 'none', 'all')
3709 - "unicast": unicast receive state  (one of 'normal', 'none', 'all')
3710 - "vlan": vlan receive state (one of 'normal', 'none', 'all') (Since 2.0)
3711 - "broadcast-allowed": allow to receive broadcast (json-bool)
3712 - "multicast-overflow": multicast table is overflowed (json-bool)
3713 - "unicast-overflow": unicast table is overflowed (json-bool)
3714 - "main-mac": main macaddr string (json-string)
3715 - "vlan-table": a json-array of active vlan id
3716 - "unicast-table": a json-array of unicast macaddr string
3717 - "multicast-table": a json-array of multicast macaddr string
3718
3719 Example:
3720
3721 -> { "execute": "query-rx-filter", "arguments": { "name": "vnet0" } }
3722 <- { "return": [
3723         {
3724             "promiscuous": true,
3725             "name": "vnet0",
3726             "main-mac": "52:54:00:12:34:56",
3727             "unicast": "normal",
3728             "vlan": "normal",
3729             "vlan-table": [
3730                 4,
3731                 0
3732             ],
3733             "unicast-table": [
3734             ],
3735             "multicast": "normal",
3736             "multicast-overflow": false,
3737             "unicast-overflow": false,
3738             "multicast-table": [
3739                 "01:00:5e:00:00:01",
3740                 "33:33:00:00:00:01",
3741                 "33:33:ff:12:34:56"
3742             ],
3743             "broadcast-allowed": false
3744         }
3745       ]
3746    }
3747
3748 EQMP
3749
3750     {
3751         .name       = "blockdev-add",
3752         .args_type  = "options:q",
3753         .mhandler.cmd_new = qmp_marshal_input_blockdev_add,
3754     },
3755
3756 SQMP
3757 blockdev-add
3758 ------------
3759
3760 Add a block device.
3761
3762 This command is still a work in progress.  It doesn't support all
3763 block drivers, it lacks a matching blockdev-del, and more.  Stay away
3764 from it unless you want to help with its development.
3765
3766 Arguments:
3767
3768 - "options": block driver options
3769
3770 Example (1):
3771
3772 -> { "execute": "blockdev-add",
3773     "arguments": { "options" : { "driver": "qcow2",
3774                                  "file": { "driver": "file",
3775                                            "filename": "test.qcow2" } } } }
3776 <- { "return": {} }
3777
3778 Example (2):
3779
3780 -> { "execute": "blockdev-add",
3781      "arguments": {
3782          "options": {
3783            "driver": "qcow2",
3784            "id": "my_disk",
3785            "discard": "unmap",
3786            "cache": {
3787                "direct": true,
3788                "writeback": true
3789            },
3790            "file": {
3791                "driver": "file",
3792                "filename": "/tmp/test.qcow2"
3793            },
3794            "backing": {
3795                "driver": "raw",
3796                "file": {
3797                    "driver": "file",
3798                    "filename": "/dev/fdset/4"
3799                }
3800            }
3801          }
3802        }
3803      }
3804
3805 <- { "return": {} }
3806
3807 EQMP
3808
3809     {
3810         .name       = "query-named-block-nodes",
3811         .args_type  = "",
3812         .mhandler.cmd_new = qmp_marshal_input_query_named_block_nodes,
3813     },
3814
3815 SQMP
3816 @query-named-block-nodes
3817 ------------------------
3818
3819 Return a list of BlockDeviceInfo for all the named block driver nodes
3820
3821 Example:
3822
3823 -> { "execute": "query-named-block-nodes" }
3824 <- { "return": [ { "ro":false,
3825                    "drv":"qcow2",
3826                    "encrypted":false,
3827                    "file":"disks/test.qcow2",
3828                    "node-name": "my-node",
3829                    "backing_file_depth":1,
3830                    "bps":1000000,
3831                    "bps_rd":0,
3832                    "bps_wr":0,
3833                    "iops":1000000,
3834                    "iops_rd":0,
3835                    "iops_wr":0,
3836                    "bps_max": 8000000,
3837                    "bps_rd_max": 0,
3838                    "bps_wr_max": 0,
3839                    "iops_max": 0,
3840                    "iops_rd_max": 0,
3841                    "iops_wr_max": 0,
3842                    "iops_size": 0,
3843                    "write_threshold": 0,
3844                    "image":{
3845                       "filename":"disks/test.qcow2",
3846                       "format":"qcow2",
3847                       "virtual-size":2048000,
3848                       "backing_file":"base.qcow2",
3849                       "full-backing-filename":"disks/base.qcow2",
3850                       "backing-filename-format:"qcow2",
3851                       "snapshots":[
3852                          {
3853                             "id": "1",
3854                             "name": "snapshot1",
3855                             "vm-state-size": 0,
3856                             "date-sec": 10000200,
3857                             "date-nsec": 12,
3858                             "vm-clock-sec": 206,
3859                             "vm-clock-nsec": 30
3860                          }
3861                       ],
3862                       "backing-image":{
3863                           "filename":"disks/base.qcow2",
3864                           "format":"qcow2",
3865                           "virtual-size":2048000
3866                       }
3867                    } } ] }
3868
3869 EQMP
3870
3871     {
3872         .name       = "query-memdev",
3873         .args_type  = "",
3874         .mhandler.cmd_new = qmp_marshal_input_query_memdev,
3875     },
3876
3877 SQMP
3878 query-memdev
3879 ------------
3880
3881 Show memory devices information.
3882
3883
3884 Example (1):
3885
3886 -> { "execute": "query-memdev" }
3887 <- { "return": [
3888        {
3889          "size": 536870912,
3890          "merge": false,
3891          "dump": true,
3892          "prealloc": false,
3893          "host-nodes": [0, 1],
3894          "policy": "bind"
3895        },
3896        {
3897          "size": 536870912,
3898          "merge": false,
3899          "dump": true,
3900          "prealloc": true,
3901          "host-nodes": [2, 3],
3902          "policy": "preferred"
3903        }
3904      ]
3905    }
3906
3907 EQMP
3908
3909     {
3910         .name       = "query-memory-devices",
3911         .args_type  = "",
3912         .mhandler.cmd_new = qmp_marshal_input_query_memory_devices,
3913     },
3914
3915 SQMP
3916 @query-memory-devices
3917 --------------------
3918
3919 Return a list of memory devices.
3920
3921 Example:
3922 -> { "execute": "query-memory-devices" }
3923 <- { "return": [ { "data":
3924                       { "addr": 5368709120,
3925                         "hotpluggable": true,
3926                         "hotplugged": true,
3927                         "id": "d1",
3928                         "memdev": "/objects/memX",
3929                         "node": 0,
3930                         "size": 1073741824,
3931                         "slot": 0},
3932                    "type": "dimm"
3933                  } ] }
3934 EQMP
3935
3936     {
3937         .name       = "query-acpi-ospm-status",
3938         .args_type  = "",
3939         .mhandler.cmd_new = qmp_marshal_input_query_acpi_ospm_status,
3940     },
3941
3942 SQMP
3943 @query-acpi-ospm-status
3944 --------------------
3945
3946 Return list of ACPIOSTInfo for devices that support status reporting
3947 via ACPI _OST method.
3948
3949 Example:
3950 -> { "execute": "query-acpi-ospm-status" }
3951 <- { "return": [ { "device": "d1", "slot": "0", "slot-type": "DIMM", "source": 1, "status": 0},
3952                  { "slot": "1", "slot-type": "DIMM", "source": 0, "status": 0},
3953                  { "slot": "2", "slot-type": "DIMM", "source": 0, "status": 0},
3954                  { "slot": "3", "slot-type": "DIMM", "source": 0, "status": 0}
3955    ]}
3956 EQMP
3957
3958 #if defined TARGET_I386
3959     {
3960         .name       = "rtc-reset-reinjection",
3961         .args_type  = "",
3962         .mhandler.cmd_new = qmp_marshal_input_rtc_reset_reinjection,
3963     },
3964 #endif
3965
3966 SQMP
3967 rtc-reset-reinjection
3968 ---------------------
3969
3970 Reset the RTC interrupt reinjection backlog.
3971
3972 Arguments: None.
3973
3974 Example:
3975
3976 -> { "execute": "rtc-reset-reinjection" }
3977 <- { "return": {} }
3978 EQMP
3979
3980     {
3981         .name       = "trace-event-get-state",
3982         .args_type  = "name:s",
3983         .mhandler.cmd_new = qmp_marshal_input_trace_event_get_state,
3984     },
3985
3986 SQMP
3987 trace-event-get-state
3988 ---------------------
3989
3990 Query the state of events.
3991
3992 Example:
3993
3994 -> { "execute": "trace-event-get-state", "arguments": { "name": "qemu_memalign" } }
3995 <- { "return": [ { "name": "qemu_memalign", "state": "disabled" } ] }
3996 EQMP
3997
3998     {
3999         .name       = "trace-event-set-state",
4000         .args_type  = "name:s,enable:b,ignore-unavailable:b?",
4001         .mhandler.cmd_new = qmp_marshal_input_trace_event_set_state,
4002     },
4003
4004 SQMP
4005 trace-event-set-state
4006 ---------------------
4007
4008 Set the state of events.
4009
4010 Example:
4011
4012 -> { "execute": "trace-event-set-state", "arguments": { "name": "qemu_memalign", "enable": "true" } }
4013 <- { "return": {} }
4014 EQMP
4015
4016     {
4017         .name       = "x-input-send-event",
4018         .args_type  = "console:i?,events:q",
4019         .mhandler.cmd_new = qmp_marshal_input_x_input_send_event,
4020     },
4021
4022 SQMP
4023 @x-input-send-event
4024 -----------------
4025
4026 Send input event to guest.
4027
4028 Arguments:
4029
4030 - "console": console index. (json-int, optional)
4031 - "events": list of input events.
4032
4033 The consoles are visible in the qom tree, under
4034 /backend/console[$index]. They have a device link and head property, so
4035 it is possible to map which console belongs to which device and display.
4036
4037 Note: this command is experimental, and not a stable API.
4038
4039 Example (1):
4040
4041 Press left mouse button.
4042
4043 -> { "execute": "x-input-send-event",
4044     "arguments": { "console": 0,
4045                    "events": [ { "type": "btn",
4046                     "data" : { "down": true, "button": "Left" } } ] } }
4047 <- { "return": {} }
4048
4049 -> { "execute": "x-input-send-event",
4050     "arguments": { "console": 0,
4051                    "events": [ { "type": "btn",
4052                     "data" : { "down": false, "button": "Left" } } ] } }
4053 <- { "return": {} }
4054
4055 Example (2):
4056
4057 Press ctrl-alt-del.
4058
4059 -> { "execute": "x-input-send-event",
4060      "arguments": { "console": 0, "events": [
4061         { "type": "key", "data" : { "down": true,
4062           "key": {"type": "qcode", "data": "ctrl" } } },
4063         { "type": "key", "data" : { "down": true,
4064           "key": {"type": "qcode", "data": "alt" } } },
4065         { "type": "key", "data" : { "down": true,
4066           "key": {"type": "qcode", "data": "delete" } } } ] } }
4067 <- { "return": {} }
4068
4069 Example (3):
4070
4071 Move mouse pointer to absolute coordinates (20000, 400).
4072
4073 -> { "execute": "x-input-send-event" ,
4074   "arguments": { "console": 0, "events": [
4075                { "type": "abs", "data" : { "axis": "X", "value" : 20000 } },
4076                { "type": "abs", "data" : { "axis": "Y", "value" : 400 } } ] } }
4077 <- { "return": {} }
4078
4079 EQMP
4080
4081     {
4082         .name       = "block-set-write-threshold",
4083         .args_type  = "node-name:s,write-threshold:l",
4084         .mhandler.cmd_new = qmp_marshal_input_block_set_write_threshold,
4085     },
4086
4087 SQMP
4088 block-set-write-threshold
4089 ------------
4090
4091 Change the write threshold for a block drive. The threshold is an offset,
4092 thus must be non-negative. Default is no write threshold.
4093 Setting the threshold to zero disables it.
4094
4095 Arguments:
4096
4097 - "node-name": the node name in the block driver state graph (json-string)
4098 - "write-threshold": the write threshold in bytes (json-int)
4099
4100 Example:
4101
4102 -> { "execute": "block-set-write-threshold",
4103   "arguments": { "node-name": "mydev",
4104                  "write-threshold": 17179869184 } }
4105 <- { "return": {} }
4106
4107 EQMP