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| = QEMU Monitor Protocol = | | = PAGE MOVED!! = |
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| The QEMU Monitor Protocol (QMP) allows applications to communicate with QEMU's Monitor.
| | This page has moved to: http://wiki.qemu.org/QMP |
| | |
| QMP is [http://www.json.org/ JSON]-based, its main features are:
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| * Lightweight, text-based, easy to parse data format
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| * Asynchronous events support
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| The [http://git.savannah.gnu.org/cgit/qemu.git/tree/QMP/README README] file explains how to use it and its full specification can be found [http://git.savannah.gnu.org/cgit/qemu.git/tree/QMP/qmp-spec.txt here].
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| == General Status ==
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| A '''preview''' version of QMP is available in QEMU version 0.12.
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| However, QMP is still under development being considered unstable and incomplete. For more information about converted handlers, please check [[#Conversion Status]].
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| == Examples ==
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| In the following examples, 'C' stands for 'Client' and 'S' stands for 'Server'.
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| === Server Greeting ===
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| S: {"QMP": {"capabilities": []}}
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| === Query version ===
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| C: { "execute": "query-version" }
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| S: {"return": {"qemu": "0.11.50", "package": ""}}
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| === Eject a device ===
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| C: { "execute": "eject", "arguments": { "device": "ide1-cd0" } }
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| S: {"return": {}}
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| == Development ==
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| Primary contact is [mailto:lcapitulino@redhat.com Luiz Capitulino], but all QMP-related discussions happen on the [http://lists.nongnu.org/mailman/listinfo/qemu-devel qemu-devel] mailing list.
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| Next features, hot fixes and other patches are stored in the QMP unstable repository:
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| http://repo.or.cz/w/qemu/qmp-unstable.git
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| '''NOTE''': all branches in this repository are constantly ''rebased'' (master inclusive).
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| == TODO ==
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| * Convert all remaining commands
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| * High-level protocol documentation
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| * High-level internal documentation
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| * Improve internal API, currently it's too [http://lists.gnu.org/archive/html/qemu-devel/2009-12/msg02537.html low-level]
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| * Better QObjects and QMP debug support
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| * Array-based Monitor's command table
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| * Libqmp
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| == Conversion Status ==
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| '''UPDATED''': 2009-12-16
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| {| border="1"
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| |Command
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| |Info
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| |-
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| |Handlers
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| |62
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| |36
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| |-
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| |Converted
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| |19
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| |15
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| |-
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| |Percentage
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| |30%
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| |41%
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| |-
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| |}
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| The following tables have a per-function status. There is one table for ''command'' handlers and another one for ''info'' handlers.
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| Status can be:
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| * merged: already merged upstream
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| * converted: converted but not merged yet
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| * partial: merged, but error handling is incomplete
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| '''NOTE:''' Handlers used by [http://libvirt.org Libvirt] are marked with yellow.
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| ==== Command handlers ====
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| {| border="1"
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| |'''Handler name'''
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| |'''Status'''
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| |'''Version'''
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| |'''Comments'''
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| |-
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| |do_acl_add()
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| |-
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| |do_acl_policy()
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| |-
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| |do_acl_remove()
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| |-
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| |do_acl_reset()
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| |-
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| |do_acl_show()
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| |- style="background-color:yellow;"
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| |do_balloon()
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| |merged
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| |0.12
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| |-
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| |do_block_set_passwd()
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| |merged
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| |0.12
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| |-
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| |do_boot_set()
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| |- style="background-color:yellow;"
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| |do_change()
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| |merged
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| |0.12
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| |- style="background-color:yellow;"
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| |do_closefd()
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| |merged
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| |0.12
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| |-
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| |do_commit()
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| |- style="background-color:yellow;"
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| |do_cont()
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| |merged
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| |0.12
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| |- style="background-color:yellow;"
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| |do_cpu_set()
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| |merged
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| |0.12.50
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| |-
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| |do_delvm()
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| |- style="background-color:yellow;"
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| |do_device_add()
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| |- style="background-color:yellow;"
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| |do_device_del()
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| |- style="background-color:yellow;"
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| |do_eject()
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| |merged
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| |0.12
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| |-
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| |do_gdbserver()
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| |- style="background-color:yellow;"
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| |do_getfd()
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| |merged
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| |0.12
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| |-
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| |do_help_cmd()
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| |-
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| |do_info()
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| |merged
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| |0.12
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| |as 'query-' commands
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| |-
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| |do_inject_mce()
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| |-
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| |do_inject_nmi()
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| |-
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| |do_ioport_read()
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| |-
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| |do_ioport_write()
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| |-
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| |do_loadvm()
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| |-
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| |do_log()
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| |-
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| |do_logfile()
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| |-
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| |do_memory_dump()
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| |- style="background-color:yellow;"
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| |do_memory_save()
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| |merged
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| |0.12.50
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| |- style="background-color:yellow;"
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| |do_migrate()
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| |partial
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| |0.12
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| |- style="background-color:yellow;"
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| |do_migrate_cancel()
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| |merged
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| |0.12
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| |- style="background-color:yellow;"
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| |do_migrate_set_downtime()
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| |merged
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| |0.12.50
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| |- style="background-color:yellow;"
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| |do_migrate_set_speed()
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| |merged
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| |0.12.50
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| |-
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| |do_mouse_button()
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| |-
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| |do_mouse_move()
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| |-
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| |do_mouse_set()
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| |- style="background-color:yellow;"
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| |do_pci_device_hot_remove()
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| |partial
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| |0.12
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| |legacy, use device_del instead
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| |-
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| |do_physical_memory_dump()
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| |- style="background-color:yellow;"
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| |do_physical_memory_save()
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| |merged
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| |0.12.50
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| |-
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| |do_print()
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| |-
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| |do_quit()
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| |merged
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| |0.12
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| |-
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| |do_savevm()
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| |-
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| |do_screen_dump()
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| |-
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| |do_sendkey()
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| |- style="background-color:yellow;"
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| |do_set_link()
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| |-
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| |do_singlestep()
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| |- style="background-color:yellow;"
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| |do_stop()
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| |merged
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| |0.12
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| |-
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| |do_stop_capture()
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| |-
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| |do_sum()
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| |- style="background-color:yellow;"
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| |do_system_powerdown()
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| |merged
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| |0.12
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| |-
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| |do_system_reset()
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| |merged
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| |0.12
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| |- style="background-color:yellow;"
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| |do_usb_add()
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| |legacy, use device_add instead
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| |- style="background-color:yellow;"
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| |do_usb_del()
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| |legacy, use device_del instead
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| |-
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| |do_watchdog_action()
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| |-
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| |do_wav_capture()
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| |- style="background-color:yellow;"
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| |drive_hot_add()
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| |- style="background-color:yellow;"
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| |net_host_device_add()
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| |consider do_netdev_add() instead
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| |- style="background-color:yellow;"
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| |net_host_device_remove()
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| |consider do_netdev_del() instead
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| |-
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| |net_slirp_hostfwd_add()
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| |-
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| |net_slirp_hostfwd_remove()
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| |- style="background-color:yellow;"
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| |pci_device_hot_add()
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| |partial
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| |0.12
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| |legacy, use device_add instead
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| |-
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| |do_chardev_add()
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| |to be created
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| |-
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| |do_chardev_del()
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| |to be created
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| |-
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| |do_blockdev_add()
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| |to be created
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| |-
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| |do_blockdev_del()
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| |to be created
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| |-
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| |do_netdev_add()
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| |to be created
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| |-
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| |do_netdev_del()
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| |to be created
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| |-
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| |}
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| ==== Info handlers ====
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| {| border="1"
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| |'''Handler name'''
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| |'''Status'''
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| |'''Version'''
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| |'''Comments'''
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| |- style="background-color:yellow;"
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| |bdrv_info()
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| |merged
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| |0.12
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| |- style="background-color:yellow;"
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| |bdrv_info_stats()
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| |merged
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| |0.12
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| |- style="background-color:yellow;"
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| |do_info_balloon()
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| |merged
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| |0.12
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| |-
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| |do_info_capture()
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| |- style="background-color:yellow;"
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| |do_info_cpus()
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| |merged
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| |0.12
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| |-
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| |do_info_cpu_stats()
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| |-
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| |do_info_history()
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| |-
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| |do_info_hpet()
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| |merged
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| |0.12
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| |-
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| |do_info_jit()
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| |-
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| |do_info_kvm()
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| |merged
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| |0.12
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| |-
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| |do_info_mice()
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| |merged
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| |0.12
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| |- style="background-color:yellow;"
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| |do_info_migrate()
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| |merged
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| |0.12
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| |-
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| |do_info_name()
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| |merged
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| |0.12
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| |-
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| |do_info_network()
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| |-
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| |do_info_numa()
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| |-
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| |do_info_profile()
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| |-
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| |do_info_qdm()
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| |-
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| |do_info_qtree()
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| |-
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| |do_info_registers()
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| |-
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| |do_info_roms()
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| |-
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| |do_info_snapshots()
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| |-
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| |do_info_status()
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| |merged
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| |0.12
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| |-
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| |do_info_usernet()
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| |-
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| |do_info_uuid()
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| |merged
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| |0.12
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| |-
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| |do_info_version()
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| |merged
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| |0.12
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| |-
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| |do_info_vnc()
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| |merged
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| |0.12
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| |-
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| |irq_info()
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| |-
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| |mem_info()
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| |- style="background-color:yellow;"
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| |pci_info()
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| |-
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| |pcmcia_info()
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| |-
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| |pic_info()
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| |-
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| |qemu_chr_info()
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| |merged
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| |0.12
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| |-
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| |tlb_info()
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| |-
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| |usb_host_info()
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| |- style="background-color:yellow;"
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| |usb_info()
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| |-
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| |}
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| == Testing ==
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| Unfortunately, there is no automated tool to test QMP correctness yet. Probably, the right thing to do is to integrate with [http://www.linux-kvm.org/page/KVM-Autotest kvm-autotest] but we still have to think how this should be done.
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| Meanwhile, QMP testing is a low-level procedure which requires knowledge about the protocol and its implementation, so the first thing to do is to read the [http://git.savannah.gnu.org/cgit/qemu.git/tree/QMP/README README] and [http://git.savannah.gnu.org/cgit/qemu.git/tree/QMP/qmp-spec.txt spec] files.
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| This section describes two ways of testing QMP:
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| * By hand (difficult, only worth it if you're chasing a specific bug)
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| * Using qmp-shell script (automates part of the job)
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| '''TODO''': libvirt should be far easier, describe it!
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| === By hand ===
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| 1. Start QMP on a TCP socket, so that telnet can be used
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| qemu [...] -qmp tcp:localhost:4444,server
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| 2. Now, run telnet
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| telnet localhost 4444
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| 3. You should see the following prompt
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| {"QMP": {"capabilities": []}}
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| 4. Now you can issue commands. To get a list of QMP supported commands, run ''query-commands''
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| { "execute": "query-commands" }
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| '''NOTE:''' all "info" commands are available under QMP as "query-", for example "info vnc" is "query-vnc".
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| The output of ''query-commands'' is a JSON array of objects, each with a 'name' key, which has the name of the supported command. QMP doesn't have user documentation yet, this means that, to find out which arguments a command accepts or what's its output, you will have to either check the [http://git.savannah.gnu.org/cgit/qemu.git/tree/qemu-monitor.hx qemu-monitor.hx] file and/or the function which implements the command.
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| Yes, it's that low-level.
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| === qmp-shell script ===
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| This script is available under the [http://git.savannah.gnu.org/cgit/qemu.git/tree/QMP QMP] directory in QEMU's source-tree. It automates a bit the testing work, as it can construct commands.
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| 1. Start QMP on a unix socket, like:
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| qemu [...] -qmp unix:./qmp-sock,server
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| 2. Run the script
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| qmp-shell ./qmp-sock
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| 3. You should get the following prompt
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| (QEMU)
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| 4. Now you can run commands. For example, let's change the VNC password:
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| (QEMU) change device=vnc target=password arg='1234'
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| | |
| So, it's needed to name the arguments and the script is not very smart. Again, to find out what arguments a command accepts, you have to either check the [http://git.savannah.gnu.org/cgit/qemu.git/tree/qemu-monitor.hx qemu-monitor.hx] file and/or the function which implements the command.
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| Have fun!
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| | |
| == History ==
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| This was the fourth proposal for a Monitor protocol, past discussions can be found in the following links:
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| * http://www.mail-archive.com/qemu-devel@nongnu.org/msg14593.html
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| * http://lists.gnu.org/archive/html/qemu-devel/2009-01/msg00655.html
| |
| * http://lists.gnu.org/archive/html/qemu-devel/2009-06/msg01584.html
| |