Patchwork [1/2] QMP: Introduce commands doc

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Submitter Luiz Capitulino
Date April 30, 2010, 5:03 p.m.
Message ID <1272647018-29771-2-git-send-email-lcapitulino@redhat.com>
Download mbox | patch
Permalink /patch/51351/
State New
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Luiz Capitulino - April 30, 2010, 5:03 p.m.
One of the most important missing feature in QMP today is its
supported command documentation.

The plan is to make it part of self-description support, however
self-description is a big task we have been postponing for a
long time now and still don't know when it's going to be done.

In order not to compromise QMP adoption and make users' life easier,
this commit adds a simple text documentation which fully describes
all QMP supported commands.

This is not ideal for a number of reasons (harder to maintain,
text-only, etc) but is a lot better than the current situation.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 QMP/qmp-commands.txt |  859 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 859 insertions(+), 0 deletions(-)
 create mode 100644 QMP/qmp-commands.txt
Markus Armbruster - May 3, 2010, 4:24 p.m.
Luiz Capitulino <lcapitulino@redhat.com> writes:

> One of the most important missing feature in QMP today is its
> supported command documentation.
>
> The plan is to make it part of self-description support, however
> self-description is a big task we have been postponing for a
> long time now and still don't know when it's going to be done.
>
> In order not to compromise QMP adoption and make users' life easier,
> this commit adds a simple text documentation which fully describes
> all QMP supported commands.
>
> This is not ideal for a number of reasons (harder to maintain,
> text-only, etc) but is a lot better than the current situation.
>
> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
> ---
>  QMP/qmp-commands.txt |  859 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 859 insertions(+), 0 deletions(-)
>  create mode 100644 QMP/qmp-commands.txt
>
> diff --git a/QMP/qmp-commands.txt b/QMP/qmp-commands.txt
> new file mode 100644
> index 0000000..2f9c448
> --- /dev/null
> +++ b/QMP/qmp-commands.txt
> @@ -0,0 +1,859 @@
> +                        QMP Supported Commands
> +                        ----------------------
> +
> +This document describes all commands currently supported by QMP.
> +
> +Most of the time their usage is exactly the same as in the user Monitor,
> +this means that any other document which also describe commands (the manpage,
> +QEMU's manual, etc) can and should be consulted.
> +
> +QMP has two types of commands: regular and query commands. Regular commands
> +usually change the Virtual Machine's state someway, while query commands just
> +return information. The sections below are divided accordingly.
> +
> +It's also important to observe that the 'example' subsection is different
> +for regular and query commands. For the former, a complete input line as it
> +should be issued by the Client is shown. For the latter, what is shown is
> +the complete Server response, whose members might be in different order when
> +in real protocol usage.
> +
> +Please, refert to the QMP specification (QMP/qmp-spec.txt file) for detailed
> +information on the Server command and response formats.
> +
> +NOTE: This document is temporary and will be replaced soon.
> +
> +1. Regular Commands
> +===================
> +
> +balloon
> +-------
> +
> +Request VM to change its memory allocation (in bytes).
> +
> +Arguments:
> +
> +- "value": New memory allocation (json-int)
> +
> +Example:
> +
> +{ "execute": "balloon", "arguments": { "value": 536870912 } }
> +
> +block_passwd
> +------------
> +
> +Set the password of encrypted block devices.
> +
> +Arguments:
> +
> +- "device": device name (json-string)
> +- "password": password (json-string)
> +
> +Example:
> +
> +{ "execute": "block_passwd", "arguments": { "device": "ide0-hd0",
> +                                            "password": "12345" } }
> +
> +change
> +------
> +
> +Change a removable medium or VNC configuration.
> +
> +Arguments:
> +
> +- "device": device name (json-string)
> +- "target": filename or item (json-string)
> +- "arg": additional argument (json-string, optional)
> +
> +Examples:
> +
> +{ "execute": "change",
> +             "arguments": { "device": "ide1-cd0",
> +                            "target": "/srv/images/Fedora-12-x86_64-DVD.iso" } }
> +
> +{ "execute": "change",
> +             "arguments": { "device": "vnc",
> +                            "target": "password",
> +                            "arg": "foobar1" } }
> +
> +closefd
> +-------
> +
> +Close a file descriptor previously passed via SCM rights.
> +
> +Arguments:
> +
> +- "fdname": file descriptor name (json-string)
> +
> +Example:
> +
> +{ "execute": "closefd", "arguments": { "name": "fd1" } }

Example argument is wrong ("name" instead of "fdname").

> +
> +cont
> +----
> +
> +Resume emulation.
> +
> +Arguments: None.
> +
> +Example:
> +
> +{ "execute": "cont" }
> +
> +cpu
> +---
> +
> +Set the default CPU.
> +
> +Arguments:
> +
> +- "index": the CPU's index (json-int)
> +
> +Example:
> +
> +{ "execute": "cpu", "arguments": { "index": 0 } }
> +
> +Note: CPUs' indexes are obtained with the 'query-cpus' command.
> +
> +device_add
> +----------
> +
> +Add a device.
> +
> +Arguments:
> +
> +- "driver": the name of the new device's driver (json-string)
> +- "bus": the device's parent bus (device tree path, json-string)

"bus" is optional (see your example below).

> +- "id": the device's ID, must be unique (json-string)
> +- device properties
> +
> +Example:
> +
> +{ "execute": "device_add", "arguments": { "driver": "e1000", "id": "net1" } }
> +
> +Note: For detailed information about this command, please refer to the
> +      'docs/qdev-device-use.txt' file.

What about pointing to "-device FOO,\?" here?  Lists device properties,
pretty crude, but better than nothing.

> +
> +device_del
> +----------
> +
> +Remove a device.
> +
> +Arguments:
> +
> +- "id": the device's ID (json-string)
> +
> +Example:
> +
> +{ "execute": "device_del", "arguments": { "id": "net1" } }
> +
> +eject
> +-----
> +
> +Eject a removable medium.
> +
> +Arguments: 
> +
> +- force: force ejection (json-bool, optional)
> +- device: device name (json-string)
> +
> +Example:
> +
> +{ "execute": "eject", "arguments": { "device": "ide1-cd0" } }
> +
> +Note: The "force" argument defaults to false.
> +
> +getfd
> +-----
> +
> +Receive a file descriptor via SCM rights and assign it a name.
> +
> +Arguments:
> +
> +- "fdname": file descriptor name (json-string)
> +
> +Example:
> +
> +{ "execute": "getfd", "arguments": { "name": "fd1" } }

Example argument is wrong ("name" instead of "fdname").

> +
> +memsave
> +-------
> +
> +Save to disk virtual memory dump starting at 'val' of size 'size'.
> +
> +Arguments:
> +
> +- "val": the starting address (json-int)
> +- "size": the memory size (json-int)
> +- "filename": file path (json-string)
> +
> +Example:
> +
> +{ "execute": "memsave",
> +             "arguments": { "val": 10,
> +                            "size": 100,
> +                            "filename": "/tmp/virtual-mem-dump" } }
> +
> +migrate
> +-------
> +
> +Migrate to URI.
> +
> +Arguments:
> +
> +- "blk": block migration, full disk copy (json-bool, optional)
> +- "inc": incremental disk copy (json-bool, optional)
> +- "uri": Destination URI (json-string, optional)

I don't think "uri" is optional.

> +
> +Example:
> +
> +{ "execute": "migrate", "arguments": { "uri": "tcp:0:4446" } }
> +
> +Notes:
> +
> +(1) The 'query-migrate' command should be used to check migration's progress
> +    and final result (this information is provided by the 'status' member)
> +(2) All boolean arguments default to false

Don't they always default to false?

> +(3) The user Monitor's "detach" argument is invalid in QMP and should not
> +    be used

Then why do we accept it?

> +
> +migrate_cancel
> +--------------
> +
> +Cancel the current migration.
> +
> +Arguments: None.
> +
> +Example:
> +
> +{ "execute": "migrate_cancel" }
> +
> +migrate_set_downtime
> +--------------------
> +
> +Set maximum tolerated downtime (in seconds) for migrations.
> +
> +Arguments:
> +
> +- "value": maximum downtime (json-number)
> +
> +Example:
> +
> +{ "execute": "migrate_set_downtime", "arguments": { "value": 60 } }
> +
> +migrate_set_speed
> +-----------------
> +
> +Set maximum speed (in bytes) for migrations.

"bytes" is not a unit of speed.  Same problem in qemu-monitor.hx.  If
it's good enough there...

> +
> +Arguments:
> +
> +- "value": maximum speed (json-number)
> +
> +Example:
> +
> +{ "execute": "migrate_set_speed", "arguments": { "value": 1024 } }
> +
> +netdev_add
> +----------
> +
> +Add host network device.
> +
> +Arguments:
> +
> +- "type": the device type, "tap", "user", ... (json-string)
> +- "id": the device's ID, must be unique (json-string)
> +- device options

What about a pointer to device option documentation here?

> +
> +Example:
> +
> +{ "execute": "netdev_add", "arguments": { "type": "user", "id": "netdev1" } }
> +
> +netdev_del
> +----------
> +
> +Remove host network device.
> +
> +Arguments:
> +
> +- "id": the device's ID, must be unique (json-string)
> +
> +Example:
> +
> +{ "execute": "netdev_del", "arguments": { "id": "netdev1" } }
> +
> +pmemsave
> +--------
> +
> +Save to disk physical memory dump starting at 'val' of size 'size'.
> +
> +Arguments:
> +
> +- "val": the starting address (json-int)
> +- "size": the memory size (json-int)
> +- "filename": file path (json-string)
> +
> +Example:
> +
> +{ "execute": "pmemsave",
> +             "arguments": { "val": 10,
> +                            "size": 100,
> +                            "filename": "/tmp/physical-mem-dump" } }
> +
> +qmp_capabilities
> +----------------
> +
> +Enable QMP capabilities.
> +
> +Arguments: None.
> +
> +Note: This command must be issued before issuing any other command.
> +
> +quit
> +----
> +
> +Quit the emulator.
> +
> +Arguments: None.
> +
> +Example:
> +
> +{ "execute": "quit" }
> +
> +screendump
> +----------
> +
> +Save screen into PPM image.
> +
> +Arguments:
> +
> +- "filename": file path (json-string)
> +
> +Example:
> +
> +{ "execute": "screendump", "arguments": { "filename": "/tmp/image" } }
> +
> +set_link
> +--------
> +
> +Change the link status of a network adapter.
> +
> +Arguments:
> +
> +- "name": network device name (json-string)
> +- "up": status is up (json-bool)
> +
> +Example:
> +
> +{ "execute": "set_link", "arguments": { "name": "e1000.0", "up": false } }
> +
> +stop
> +----
> +
> +Stop the emulator.
> +
> +Arguments: None.
> +
> +Example:
> +
> +{ "execute": "stop" }
> +
> +system_powerdown
> +----------------
> +
> +Send system power down event.
> +
> +Arguments: None.
> +
> +Example:
> +
> +{ "execute": "system_powerdown" }
> +
> +system_reset
> +------------
> +
> +Reset the system.
> +
> +Arguments: None.
> +
> +Example:
> +
> +{ "execute": "system_reset" }
[...]

I'll review the rest later.
Luiz Capitulino - May 4, 2010, 9:58 p.m.
On Mon, 03 May 2010 18:24:11 +0200
Markus Armbruster <armbru@redhat.com> wrote:

> > +
> > +Example:
> > +
> > +{ "execute": "migrate", "arguments": { "uri": "tcp:0:4446" } }
> > +
> > +Notes:
> > +
> > +(1) The 'query-migrate' command should be used to check migration's progress
> > +    and final result (this information is provided by the 'status' member)
> > +(2) All boolean arguments default to false
> 
> Don't they always default to false?

 Yes, but I'm not sure if we should make this such a general rule, maybe
it should be possible to say what the default is. And we can do that for
new commands if we want to.

> > +(3) The user Monitor's "detach" argument is invalid in QMP and should not
> > +    be used
> 
> Then why do we accept it?

 It's a bug, nevertheless I think it's worth noting it's not accepted.

Patch

diff --git a/QMP/qmp-commands.txt b/QMP/qmp-commands.txt
new file mode 100644
index 0000000..2f9c448
--- /dev/null
+++ b/QMP/qmp-commands.txt
@@ -0,0 +1,859 @@ 
+                        QMP Supported Commands
+                        ----------------------
+
+This document describes all commands currently supported by QMP.
+
+Most of the time their usage is exactly the same as in the user Monitor,
+this means that any other document which also describe commands (the manpage,
+QEMU's manual, etc) can and should be consulted.
+
+QMP has two types of commands: regular and query commands. Regular commands
+usually change the Virtual Machine's state someway, while query commands just
+return information. The sections below are divided accordingly.
+
+It's also important to observe that the 'example' subsection is different
+for regular and query commands. For the former, a complete input line as it
+should be issued by the Client is shown. For the latter, what is shown is
+the complete Server response, whose members might be in different order when
+in real protocol usage.
+
+Please, refert to the QMP specification (QMP/qmp-spec.txt file) for detailed
+information on the Server command and response formats.
+
+NOTE: This document is temporary and will be replaced soon.
+
+1. Regular Commands
+===================
+
+balloon
+-------
+
+Request VM to change its memory allocation (in bytes).
+
+Arguments:
+
+- "value": New memory allocation (json-int)
+
+Example:
+
+{ "execute": "balloon", "arguments": { "value": 536870912 } }
+
+block_passwd
+------------
+
+Set the password of encrypted block devices.
+
+Arguments:
+
+- "device": device name (json-string)
+- "password": password (json-string)
+
+Example:
+
+{ "execute": "block_passwd", "arguments": { "device": "ide0-hd0",
+                                            "password": "12345" } }
+
+change
+------
+
+Change a removable medium or VNC configuration.
+
+Arguments:
+
+- "device": device name (json-string)
+- "target": filename or item (json-string)
+- "arg": additional argument (json-string, optional)
+
+Examples:
+
+{ "execute": "change",
+             "arguments": { "device": "ide1-cd0",
+                            "target": "/srv/images/Fedora-12-x86_64-DVD.iso" } }
+
+{ "execute": "change",
+             "arguments": { "device": "vnc",
+                            "target": "password",
+                            "arg": "foobar1" } }
+
+closefd
+-------
+
+Close a file descriptor previously passed via SCM rights.
+
+Arguments:
+
+- "fdname": file descriptor name (json-string)
+
+Example:
+
+{ "execute": "closefd", "arguments": { "name": "fd1" } }
+
+cont
+----
+
+Resume emulation.
+
+Arguments: None.
+
+Example:
+
+{ "execute": "cont" }
+
+cpu
+---
+
+Set the default CPU.
+
+Arguments:
+
+- "index": the CPU's index (json-int)
+
+Example:
+
+{ "execute": "cpu", "arguments": { "index": 0 } }
+
+Note: CPUs' indexes are obtained with the 'query-cpus' command.
+
+device_add
+----------
+
+Add a device.
+
+Arguments:
+
+- "driver": the name of the new device's driver (json-string)
+- "bus": the device's parent bus (device tree path, json-string)
+- "id": the device's ID, must be unique (json-string)
+- device properties
+
+Example:
+
+{ "execute": "device_add", "arguments": { "driver": "e1000", "id": "net1" } }
+
+Note: For detailed information about this command, please refer to the
+      'docs/qdev-device-use.txt' file.
+
+device_del
+----------
+
+Remove a device.
+
+Arguments:
+
+- "id": the device's ID (json-string)
+
+Example:
+
+{ "execute": "device_del", "arguments": { "id": "net1" } }
+
+eject
+-----
+
+Eject a removable medium.
+
+Arguments: 
+
+- force: force ejection (json-bool, optional)
+- device: device name (json-string)
+
+Example:
+
+{ "execute": "eject", "arguments": { "device": "ide1-cd0" } }
+
+Note: The "force" argument defaults to false.
+
+getfd
+-----
+
+Receive a file descriptor via SCM rights and assign it a name.
+
+Arguments:
+
+- "fdname": file descriptor name (json-string)
+
+Example:
+
+{ "execute": "getfd", "arguments": { "name": "fd1" } }
+
+memsave
+-------
+
+Save to disk virtual memory dump starting at 'val' of size 'size'.
+
+Arguments:
+
+- "val": the starting address (json-int)
+- "size": the memory size (json-int)
+- "filename": file path (json-string)
+
+Example:
+
+{ "execute": "memsave",
+             "arguments": { "val": 10,
+                            "size": 100,
+                            "filename": "/tmp/virtual-mem-dump" } }
+
+migrate
+-------
+
+Migrate to URI.
+
+Arguments:
+
+- "blk": block migration, full disk copy (json-bool, optional)
+- "inc": incremental disk copy (json-bool, optional)
+- "uri": Destination URI (json-string, optional)
+
+Example:
+
+{ "execute": "migrate", "arguments": { "uri": "tcp:0:4446" } }
+
+Notes:
+
+(1) The 'query-migrate' command should be used to check migration's progress
+    and final result (this information is provided by the 'status' member)
+(2) All boolean arguments default to false
+(3) The user Monitor's "detach" argument is invalid in QMP and should not
+    be used
+
+migrate_cancel
+--------------
+
+Cancel the current migration.
+
+Arguments: None.
+
+Example:
+
+{ "execute": "migrate_cancel" }
+
+migrate_set_downtime
+--------------------
+
+Set maximum tolerated downtime (in seconds) for migrations.
+
+Arguments:
+
+- "value": maximum downtime (json-number)
+
+Example:
+
+{ "execute": "migrate_set_downtime", "arguments": { "value": 60 } }
+
+migrate_set_speed
+-----------------
+
+Set maximum speed (in bytes) for migrations.
+
+Arguments:
+
+- "value": maximum speed (json-number)
+
+Example:
+
+{ "execute": "migrate_set_speed", "arguments": { "value": 1024 } }
+
+netdev_add
+----------
+
+Add host network device.
+
+Arguments:
+
+- "type": the device type, "tap", "user", ... (json-string)
+- "id": the device's ID, must be unique (json-string)
+- device options
+
+Example:
+
+{ "execute": "netdev_add", "arguments": { "type": "user", "id": "netdev1" } }
+
+netdev_del
+----------
+
+Remove host network device.
+
+Arguments:
+
+- "id": the device's ID, must be unique (json-string)
+
+Example:
+
+{ "execute": "netdev_del", "arguments": { "id": "netdev1" } }
+
+pmemsave
+--------
+
+Save to disk physical memory dump starting at 'val' of size 'size'.
+
+Arguments:
+
+- "val": the starting address (json-int)
+- "size": the memory size (json-int)
+- "filename": file path (json-string)
+
+Example:
+
+{ "execute": "pmemsave",
+             "arguments": { "val": 10,
+                            "size": 100,
+                            "filename": "/tmp/physical-mem-dump" } }
+
+qmp_capabilities
+----------------
+
+Enable QMP capabilities.
+
+Arguments: None.
+
+Note: This command must be issued before issuing any other command.
+
+quit
+----
+
+Quit the emulator.
+
+Arguments: None.
+
+Example:
+
+{ "execute": "quit" }
+
+screendump
+----------
+
+Save screen into PPM image.
+
+Arguments:
+
+- "filename": file path (json-string)
+
+Example:
+
+{ "execute": "screendump", "arguments": { "filename": "/tmp/image" } }
+
+set_link
+--------
+
+Change the link status of a network adapter.
+
+Arguments:
+
+- "name": network device name (json-string)
+- "up": status is up (json-bool)
+
+Example:
+
+{ "execute": "set_link", "arguments": { "name": "e1000.0", "up": false } }
+
+stop
+----
+
+Stop the emulator.
+
+Arguments: None.
+
+Example:
+
+{ "execute": "stop" }
+
+system_powerdown
+----------------
+
+Send system power down event.
+
+Arguments: None.
+
+Example:
+
+{ "execute": "system_powerdown" }
+
+system_reset
+------------
+
+Reset the system.
+
+Arguments: None.
+
+Example:
+
+{ "execute": "system_reset" }
+
+
+2. Query Commands
+=================
+
+query-balloon
+-------------
+
+Show balloon information.
+
+Make an asynchronous request for balloon info. When the request completes a
+json-object will be returned containing the following data:
+
+- "actual": current balloon value in bytes (json-int)
+- "mem_swapped_in": Amount of memory swapped in bytes (json-int, optional)
+- "mem_swapped_out": Amount of memory swapped out in bytes (json-int, optional)
+- "major_page_faults": Number of major faults (json-int, optional)
+- "minor_page_faults": Number of minor faults (json-int, optional)
+- "free_mem":Total amount of free and unused memory in bytes (json-int,optional)
+- "total_mem": Total amount of available memory in bytes (json-int, optional)
+
+Example:
+
+{ "return": { "actual": 1073741824,
+              "mem_swapped_in": 0,
+              "mem_swapped_out": 0,
+              "major_page_faults": 142,
+              "minor_page_faults": 239245,
+              "free_mem": 1014185984,
+              "total_mem": 1044668416 } }
+
+query-block
+-----------
+
+Show the block devices.
+
+Each block device information is stored in a json-object and the returned value
+is a json-array of all devices.
+
+Each json-object contain the following:
+
+- "device": device name (json-string)
+- "type": device type (json-string)
+- "removable": true if the device is removable, false otherwise (json-bool)
+- "locked": true if the device is locked, false otherwise (json-bool)
+- "inserted": only present if the device is inserted, it is a json-object
+   containing the following:
+         - "file": device file name (json-string)
+         - "ro": true if read-only, false otherwise (json-bool)
+         - "drv": driver format name (json-string)
+         - "backing_file": backing file name if one is used (json-string)
+         - "encrypted": true if encrypted, false otherwise (json-bool)
+
+Example:
+
+{ "return": [ { "device": "ide0-hd0",
+                "type": "hd",
+                "removable": false,
+                "locked": false,
+                "inserted": { "file": "/tmp/foobar",
+                              "ro": false,
+                              "drv": "qcow2" } },
+              { "device": "floppy0",
+                "type": "floppy",
+                "removable": true,
+                "locked": false } ] }
+
+query-blockstats
+----------------
+
+Show block device statistics.
+
+Each device statistic information is stored in a json-object and the returned
+value is a json-array of all devices.
+
+Each json-object contain the following:
+
+- "device": device name (json-string)
+- "stats": A json-object with the statistics information, it contains:
+    - "rd_bytes": bytes read (json-int)
+    - "wr_bytes": bytes written (json-int)
+    - "rd_operations": read operations (json-int)
+    - "wr_operations": write operations (json-int)
+
+Example:
+
+{ "return": [ { "device": "ide0-hd0",
+                "stats": { "rd_bytes": 512,
+                           "wr_bytes": 0,
+                           "rd_operations": 1,
+                           "wr_operations": 0 } },
+              { "device": "ide1-cd0",
+                "stats": { "rd_bytes": 0,
+                           "wr_bytes": 0,
+                           "rd_operations": 0,
+                           "wr_operations": 0 } } ] }
+
+query-chardev
+-------------
+
+Each device is represented by a json-object. The returned value is a json-array
+of all devices.
+
+Each json-object contain the following:
+
+- "label": device's label (json-string)
+- "filename": device's file (json-string)
+
+Example:
+
+{ "return": [ { "label": "monitor", "filename", "stdio" },
+              { "label": "serial0", "filename": "vc" } ] }
+
+query-commands
+--------------
+
+List QMP available commands.
+
+Each command is represented by a json-object, the returned value is a json-array
+of all commands.
+
+Each json-object contain:
+
+- "name": command's name (json-string)
+
+Example:
+
+{ "return": [ { "name": "query-balloon" },
+              { "name": "system_powerdown" } ] }
+
+Note: This example has been shortened as the real response is too long.
+
+query-cpus
+----------
+
+Show CPU information.
+
+Return a json-array. Each CPU is represented by a json-object, which contains:
+
+- "cpu": CPU index (json-int)
+- "current": true if this is the current CPU, false otherwise (json-bool)
+- "halted": true if the cpu is halted, false otherwise (json-bool)
+- Current program counter. The key's name depends on the architecture:
+     "pc": i386/x86_64 (json-int)
+     "nip": PPC (json-int)
+     "pc" and "npc": sparc (json-int)
+     "PC": mips (json-int)
+
+Example:
+
+{ "return": [ { "CPU": 0,
+                "current": true,
+                "halted": false,
+                "pc": 3227107138 },
+              { "CPU": 1,
+                "current": false,
+                "halted": true,
+                "pc": 7108165 } ] }
+
+query-hpet
+----------
+
+Show HPET state.
+
+Return a json-object with the following information:
+
+- "enabled": true if hpet if enabled, false otherwise (json-bool)
+
+Example:
+
+{ "return": { "enabled": true } }
+
+query-kvm
+---------
+
+Show KVM information.
+
+Return a json-object with the following information:
+
+- "enabled": true if KVM support is enabled, false otherwise (json-bool)
+- "present": true if QEMU has KVM support, false otherwise (json-bool)
+
+Example:
+
+{ "return": { "enabled": true, "present": true } }
+
+query-mice
+----------
+
+Show VM mice information.
+
+Each mouse is represented by a json-object, the returned value is a json-array
+of all mice.
+
+The mouse json-object contains the following:
+
+- "name": mouse's name (json-string)
+- "index": mouse's index (json-int)
+- "current": true if this mouse is receiving events, false otherwise (json-bool)
+- "absolute": true if the mouse generates absolute input events (json-bool)
+
+Example:
+
+{ "return": [ { "name": "QEMU Microsoft Mouse",
+                "index": 0,
+                "current": false,
+                "absolute": false },
+              { "name": "QEMU PS/2 Mouse",
+                "index": 1,
+                "current": true,
+                "absolute": true } ] }
+
+query-migrate
+-------------
+
+Migration status.
+
+Return a json-object. If migration is active there will be another json-object
+with RAM migration status and if block migration is active another one with
+block migration status.
+
+The main json-object contains the following:
+
+- "status": migration status (json-string)
+- "ram": only present if "status" is "active", it is a json-object with the
+  following RAM information (in bytes):
+         - "transferred": amount transferred (json-int)
+         - "remaining": amount remaining (json-int)
+         - "total": total (json-int)
+- "disk": only present if "status" is "active" and it is a block migration,
+  it is a json-object with the following disk information (in bytes):
+         - "transferred": amount transferred (json-int)
+         - "remaining": amount remaining (json-int)
+         - "total": total (json-int)
+
+Examples:
+
+1. Migration is "completed":
+
+{ "return": { "status": "completed" } }
+
+2. Migration is "active" and it is not a block migration:
+
+{ "return": { "status": "active",
+              "ram": { "transferred": 123,
+                       "remaining": 123,
+                       "total": 246 } } }
+
+3. Migration is "active" and it is a block migration:
+
+{ "return": { "status": "active",
+              "ram": { "total": 1057024,
+                       "remaining": 1053304,
+                       "transferred": 3720 },
+              "disk": { "total": 20971520,
+                        "remaining": 20880384,
+                        "transferred": 91136 } } }
+
+query-name
+----------
+
+Show VM name.
+
+Return a json-object with the following information:
+
+- "name": VM's name (json-string, optional)
+
+Example:
+
+{ "return": { "name": "qemu-name" } }
+
+query-pci
+---------
+
+PCI buses and devices information.
+
+The returned value is a json-array of all buses. Each bus is represented by
+a json-object, which has a key with a json-array of all PCI devices attached
+to it. Each device is represented by a json-object.
+
+The bus json-object contains the following:
+
+- "bus": bus number (json-int)
+- "devices": a json-array of json-objects, each json-object represents a
+             PCI device
+
+The PCI device json-object contains the following:
+
+- "bus": identical to the parent's bus number (json-int)
+- "slot": slot number (json-int)
+- "function": function number (json-int)
+- "class_info": a json-object containing:
+     - "desc": device class description (json-string, optional)
+     - "class": device class number (json-int)
+- "id": a json-object containing:
+     - "device": device ID (json-int)
+     - "vendor": vendor ID (json-int)
+- "irq": device's IRQ if assigned (json-int, optional)
+- "qdev_id": qdev id string (json-string)
+- "pci_bridge": It's a json-object, only present if this device is a
+                PCI bridge, contains:
+     - "bus": bus number (json-int)
+     - "secondary": secondary bus number (json-int)
+     - "subordinate": subordinate bus number (json-int)
+     - "io_range": a json-object with memory range information (json-int)
+     - "memory_range": a json-object with memory range information (json-int)
+     - "prefetchable_range": a json-object with memory range
+                             information (json-int)
+     - "devices": a json-array of PCI devices if there's any attached (optional)
+- "regions": a json-array of json-objects, each json-object represents a
+             memory region of this device
+
+The memory range json-object contains the following:
+
+- "base": base memory address (json-int)
+- "limit": limit value (json-int)
+
+The region json-object can be an I/O region or a memory region, an I/O region
+json-object contains the following:
+
+- "type": "io" (json-string, fixed)
+- "bar": BAR number (json-int)
+- "address": memory address (json-int)
+- "size": memory size (json-int)
+
+A memory region json-object contains the following:
+
+- "type": "memory" (json-string, fixed)
+- "bar": BAR number (json-int)
+- "address": memory address (json-int)
+- "size": memory size (json-int)
+- "mem_type_64": true or false (json-bool)
+- "prefetch": true or false (json-bool)
+
+Example:
+
+{ "return": [ { "bus": 0,
+                "devices": [ { "bus": 0,
+                               "qdev_id": "",
+                               "slot": 0,
+                               "class_info": { "class": 1536,
+                                               "desc": "Host bridge" },
+                               "id": { "device": 32902, "vendor": 4663 },
+                               "function": 0,
+                               "regions": [] },
+                             { "bus": 0,
+                               "qdev_id": "",
+                               "slot": 1,
+                               "class_info": { "class": 1537,
+                                               "desc": "ISA bridge" },
+                               "id": { "device": 32902, "vendor": 28672 },
+                               "function": 0,
+                               "regions": [] },
+                               { "bus": 0,
+                                 "qdev_id": "",
+                                 "slot": 1,
+                                 "class_info": { "class": 257,
+                                                 "desc": "IDE controller" },
+                                 "id": { "device": 32902, "vendor": 28688 },
+                                 "function": 1,
+                                 "regions": [ { "bar": 4,
+                                                "size": 16,
+                                                "address": 49152,
+                                                "type": "io" } ] },
+                               { "bus": 0,
+                                 "qdev_id": "",
+                                 "slot": 2,
+                                 "class_info": { "class": 768,
+                                                 "desc": "VGA controller" },
+                                 "id": { "device": 4115, "vendor": 184 },
+                                 "function": 0,
+                                 "regions": [ { "prefetch": true,
+                                                "mem_type_64": false,
+                                                "bar": 0,
+                                                "size": 33554432,
+                                                "address": 4026531840,
+                                                "type": "memory" },
+                                               { "prefetch": false,
+                                                 "mem_type_64": false,
+                                                 "bar": 1,
+                                                 "size": 4096,
+                                                 "address": 4060086272,
+                                                 "type": "memory" },
+                                               { "prefetch": false,
+                                                 "mem_type_64": false,
+                                                 "bar": 6,
+                                                 "size": 65536,
+                                                 "address": -1,
+                                                 "type": "memory" } ] },
+                               { "bus": 0,
+                                 "qdev_id": "",
+                                 "irq": 11,
+                                 "slot": 4,
+                                 "class_info": { "class": 1280,
+                                                 "desc": "RAM controller" },
+                                 "id": { "device": 6900, "vendor": 4098 },
+                                 "function": 0,
+                                 "regions": [ { "bar": 0,
+                                                "size": 32,
+                                                "address": 49280,
+                                                "type": "io" } ] } ] } ] }
+
+Note: This example has been shortened as the real response is too long.
+
+query-status
+------------
+
+Return a json-object with the following information:
+
+- "running": true if the VM is running, or false if it is paused (json-bool)
+- "singlestep": true if the VM is in single step mode,
+                false otherwise (json-bool)
+
+Example:
+
+{ "return": { "running": true, "singlestep": false } }
+
+query-uuid
+----------
+
+Show VM UUID.
+
+Return a json-object with the following information:
+
+- "UUID": Universally Unique Identifier (json-string)
+
+Example:
+
+{ "return": { "UUID": "550e8400-e29b-41d4-a716-446655440000" } }
+
+query-version
+-------------
+
+Show QEMU version.
+
+Return a json-object with the following information:
+
+- "qemu": QEMU's version (json-string)
+- "package": package's version (json-string)
+
+Example:
+
+{ "return": { "qemu": "0.11.50", "package": "" } }
+
+query-vnc
+---------
+
+Show VNC server information.
+
+Return a json-object with server information. Connected clients are returned
+as a json-array of json-objects.
+
+The main json-object contains the following:
+
+- "enabled": true or false (json-bool)
+- "host": server's IP address (json-string)
+- "family": address family (json-string, "ipv4" or "ipv6")
+- "service": server's port number (json-string)
+- "auth": authentication method (json-string)
+- "clients": a json-array of all connected clients
+
+Clients are described by a json-object, each one contain the following:
+
+- "host": client's IP address (json-string)
+- "family": address family (json-string, "ipv4" or "ipv6")
+- "service": client's port number (json-string)
+- "x509_dname": TLS dname (json-string, optional)
+- "sasl_username": SASL username (json-string, optional)
+
+Example:
+
+{ "return": { "enabled": true,
+              "host": "0.0.0.0",
+              "service": "50402",
+              "auth": "vnc",
+              "family": "ipv4",
+              "clients": [ { "host": "127.0.0.1",
+                             "service": "50401",
+                             "family": "ipv4" } ] } }