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HXCOMM QMP dispatch table and documentation
HXCOMM Text between SQMP and EQMP is copied to the QMP documentation file and
HXCOMM does not show up in the other formats.
SQMP
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 important to observe that all communication examples are formatted in
a reader-friendly way, so that they're easier to understand. However, in real
protocol usage, they're emitted as a single line.
Also, the following notation is used to denote data flow:
-> data issued by the Client
<- Server data response
Please, refer to the QMP specification (QMP/qmp-spec.txt) for detailed
information on the Server command and response formats.
NOTE: This document is temporary and will be replaced soon.
1. Stability Considerations
===========================
The current QMP command set (described in this file) may be useful for a
number of use cases, however it's limited and several commands have bad
defined semantics, specially with regard to command completion.
These problems are going to be solved incrementally in the next QEMU releases
and we're going to establish a deprecation policy for badly defined commands.
If you're planning to adopt QMP, please observe the following:
1. The deprecation policy will take effect and be documented soon, please
check the documentation of each used command as soon as a new release of
QEMU is available
2. DO NOT rely on anything which is not explicit documented
3. Errors, in special, are not documented. Applications should NOT check
for specific errors classes or data (it's strongly recommended to only
check for the "error" key)
2. Regular Commands
===================
Server's responses in the examples below are always a success response, please
refer to the QMP specification for more details on error responses.
EQMP
{
.name = "quit",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_quit,
},
SQMP
quit
----
Quit the emulator.
Arguments: None.
Example:
-> { "execute": "quit" }
<- { "return": {} }
EQMP
{
.name = "eject",
.args_type = "force:-f,device:B",
.mhandler.cmd_new = qmp_marshal_input_eject,
},
SQMP
eject
-----
Eject a removable medium.
Arguments:
- force: force ejection (json-bool, optional)
- device: device name (json-string)
Example:
-> { "execute": "eject", "arguments": { "device": "ide1-cd0" } }
<- { "return": {} }
Note: The "force" argument defaults to false.
EQMP
{
.name = "change",
.args_type = "device:B,target:F,arg:s?",
.mhandler.cmd_new = qmp_marshal_input_change,
},
SQMP
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:
1. Change a removable medium
-> { "execute": "change",
"arguments": { "device": "ide1-cd0",
"target": "/srv/images/Fedora-12-x86_64-DVD.iso" } }
<- { "return": {} }
2. Change VNC password
-> { "execute": "change",
"arguments": { "device": "vnc", "target": "password",
"arg": "foobar1" } }
<- { "return": {} }
EQMP
{
.name = "screendump",
.args_type = "filename:F",
.mhandler.cmd_new = qmp_marshal_input_screendump,
},
SQMP
screendump
----------
Save screen into PPM image.
Arguments:
- "filename": file path (json-string)
Example:
-> { "execute": "screendump", "arguments": { "filename": "/tmp/image" } }
<- { "return": {} }
EQMP
{
.name = "stop",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_stop,
},
SQMP
stop
----
Stop the emulator.
Arguments: None.
Example:
-> { "execute": "stop" }
<- { "return": {} }
EQMP
{
.name = "cont",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_cont,
},
SQMP
cont
----
Resume emulation.
Arguments: None.
Example:
-> { "execute": "cont" }
<- { "return": {} }
EQMP
{
.name = "system_wakeup",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_system_wakeup,
},
SQMP
system_wakeup
-------------
Wakeup guest from suspend.
Arguments: None.
Example:
-> { "execute": "system_wakeup" }
<- { "return": {} }
EQMP
{
.name = "system_reset",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_system_reset,
},
SQMP
system_reset
------------
Reset the system.
Arguments: None.
Example:
-> { "execute": "system_reset" }
<- { "return": {} }
EQMP
{
.name = "system_powerdown",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_system_powerdown,
},
SQMP
system_powerdown
----------------
Send system power down event.
Arguments: None.
Example:
-> { "execute": "system_powerdown" }
<- { "return": {} }
EQMP
{
.name = "device_add",
.args_type = "device:O",
.params = "driver[,prop=value][,...]",
.help = "add device, like -device on the command line",
.mhandler.cmd_new = qmp_device_add,
},
SQMP
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, optional)
- "id": the device's ID, must be unique (json-string)
- device properties
Example:
-> { "execute": "device_add", "arguments": { "driver": "e1000", "id": "net1" } }
<- { "return": {} }
Notes:
(1) For detailed information about this command, please refer to the
'docs/qdev-device-use.txt' file.
(2) It's possible to list device properties by running QEMU with the
"-device DEVICE,\?" command-line argument, where DEVICE is the device's name
EQMP
{
.name = "device_del",
.args_type = "id:s",
.mhandler.cmd_new = qmp_marshal_input_device_del,
},
SQMP
device_del
----------
Remove a device.
Arguments:
- "id": the device's ID (json-string)
Example:
-> { "execute": "device_del", "arguments": { "id": "net1" } }
<- { "return": {} }
EQMP
{
.name = "send-key",
.args_type = "keys:q,hold-time:i?",
.mhandler.cmd_new = qmp_marshal_input_send_key,
},
SQMP
send-key
----------
Send keys to VM.
Arguments:
keys array:
- "key": key sequence (a json-array of key union values,
union can be number or qcode enum)
- hold-time: time to delay key up events, milliseconds. Defaults to 100
(json-int, optional)
Example:
-> { "execute": "send-key",
"arguments": { "keys": [ { "type": "qcode", "data": "ctrl" },
{ "type": "qcode", "data": "alt" },
{ "type": "qcode", "data": "delete" } ] } }
<- { "return": {} }
EQMP
{
.name = "cpu",
.args_type = "index:i",
.mhandler.cmd_new = qmp_marshal_input_cpu,
},
SQMP
cpu
---
Set the default CPU.
Arguments:
- "index": the CPU's index (json-int)
Example:
-> { "execute": "cpu", "arguments": { "index": 0 } }
<- { "return": {} }
Note: CPUs' indexes are obtained with the 'query-cpus' command.
EQMP
{
.name = "cpu-add",
.args_type = "id:i",
.mhandler.cmd_new = qmp_marshal_input_cpu_add,
},
SQMP
cpu-add
-------
Adds virtual cpu
Arguments:
- "id": cpu id (json-int)
Example:
-> { "execute": "cpu-add", "arguments": { "id": 2 } }
<- { "return": {} }
EQMP
{
.name = "memsave",
.args_type = "val:l,size:i,filename:s,cpu:i?",
.mhandler.cmd_new = qmp_marshal_input_memsave,
},
SQMP
memsave
-------
Save to disk virtual memory dump starting at 'val' of size 'size'.
Arguments:
- "val": the starting address (json-int)
- "size": the memory size, in bytes (json-int)
- "filename": file path (json-string)
- "cpu": virtual CPU index (json-int, optional)
Example:
-> { "execute": "memsave",
"arguments": { "val": 10,
"size": 100,
"filename": "/tmp/virtual-mem-dump" } }
<- { "return": {} }
EQMP
{
.name = "pmemsave",
.args_type = "val:l,size:i,filename:s",
.mhandler.cmd_new = qmp_marshal_input_pmemsave,
},
SQMP
pmemsave
--------
Save to disk physical memory dump starting at 'val' of size 'size'.
Arguments:
- "val": the starting address (json-int)
- "size": the memory size, in bytes (json-int)
- "filename": file path (json-string)
Example:
-> { "execute": "pmemsave",
"arguments": { "val": 10,
"size": 100,
"filename": "/tmp/physical-mem-dump" } }
<- { "return": {} }
EQMP
{
.name = "inject-nmi",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_inject_nmi,
},
SQMP
inject-nmi
----------
Inject an NMI on the default CPU (x86/s390) or all CPUs (ppc64).
Arguments: None.
Example:
-> { "execute": "inject-nmi" }
<- { "return": {} }
Note: inject-nmi fails when the guest doesn't support injecting.
EQMP
{
.name = "ringbuf-write",
.args_type = "device:s,data:s,format:s?",
.mhandler.cmd_new = qmp_marshal_input_ringbuf_write,
},
SQMP
ringbuf-write
-------------
Write to a ring buffer character device.
Arguments:
- "device": ring buffer character device name (json-string)
- "data": data to write (json-string)
- "format": data format (json-string, optional)
- Possible values: "utf8" (default), "base64"
Bug: invalid base64 is currently not rejected.
Whitespace *is* invalid.
Example:
-> { "execute": "ringbuf-write",
"arguments": { "device": "foo",
"data": "abcdefgh",
"format": "utf8" } }
<- { "return": {} }
EQMP
{
.name = "ringbuf-read",
.args_type = "device:s,size:i,format:s?",
.mhandler.cmd_new = qmp_marshal_input_ringbuf_read,
},
SQMP
ringbuf-read
-------------
Read from a ring buffer character device.
Arguments:
- "device": ring buffer character device name (json-string)
- "size": how many bytes to read at most (json-int)
- Number of data bytes, not number of characters in encoded data
- "format": data format (json-string, optional)
- Possible values: "utf8" (default), "base64"
- Naturally, format "utf8" works only when the ring buffer
contains valid UTF-8 text. Invalid UTF-8 sequences get
replaced. Bug: replacement doesn't work. Bug: can screw
up on encountering NUL characters, after the ring buffer
lost data, and when reading stops because the size limit
is reached.
Example:
-> { "execute": "ringbuf-read",
"arguments": { "device": "foo",
"size": 1000,
"format": "utf8" } }
<- {"return": "abcdefgh"}
EQMP
{
.name = "xen-save-devices-state",
.args_type = "filename:F",
.mhandler.cmd_new = qmp_marshal_input_xen_save_devices_state,
},
SQMP
xen-save-devices-state
-------
Save the state of all devices to file. The RAM and the block devices
of the VM are not saved by this command.
Arguments:
- "filename": the file to save the state of the devices to as binary
data. See xen-save-devices-state.txt for a description of the binary
format.
Example:
-> { "execute": "xen-save-devices-state",
"arguments": { "filename": "/tmp/save" } }
<- { "return": {} }
EQMP
{
.name = "xen-set-global-dirty-log",
.args_type = "enable:b",
.mhandler.cmd_new = qmp_marshal_input_xen_set_global_dirty_log,
},
SQMP
xen-set-global-dirty-log
-------
Enable or disable the global dirty log mode.
Arguments:
- "enable": Enable it or disable it.
Example:
-> { "execute": "xen-set-global-dirty-log",
"arguments": { "enable": true } }
<- { "return": {} }
EQMP
{
.name = "migrate",
.args_type = "detach:-d,blk:-b,inc:-i,uri:s",
.mhandler.cmd_new = qmp_marshal_input_migrate,
},
SQMP
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)
Example:
-> { "execute": "migrate", "arguments": { "uri": "tcp:0:4446" } }
<- { "return": {} }
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
EQMP
{
.name = "migrate_cancel",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_migrate_cancel,
},
SQMP
migrate_cancel
--------------
Cancel the current migration.
Arguments: None.
Example:
-> { "execute": "migrate_cancel" }
<- { "return": {} }
EQMP
{
.name = "migrate-incoming",
.args_type = "uri:s",
.mhandler.cmd_new = qmp_marshal_input_migrate_incoming,
},
SQMP
migrate-incoming
----------------
Continue an incoming migration
Arguments:
- "uri": Source/listening URI (json-string)
Example:
-> { "execute": "migrate-incoming", "arguments": { "uri": "tcp::4446" } }
<- { "return": {} }
Notes:
(1) QEMU must be started with -incoming defer to allow migrate-incoming to
be used
(2) The uri format is the same as for -incoming
EQMP
{
.name = "migrate-set-cache-size",
.args_type = "value:o",
.mhandler.cmd_new = qmp_marshal_input_migrate_set_cache_size,
},
SQMP
migrate-set-cache-size
----------------------
Set cache size to be used by XBZRLE migration, the cache size will be rounded
down to the nearest power of 2
Arguments:
- "value": cache size in bytes (json-int)
Example:
-> { "execute": "migrate-set-cache-size", "arguments": { "value": 536870912 } }
<- { "return": {} }
EQMP
{
.name = "query-migrate-cache-size",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_migrate_cache_size,
},
SQMP
query-migrate-cache-size
------------------------
Show cache size to be used by XBZRLE migration
returns a json-object with the following information:
- "size" : json-int
Example:
-> { "execute": "query-migrate-cache-size" }
<- { "return": 67108864 }
EQMP
{
.name = "migrate_set_speed",
.args_type = "value:o",
.mhandler.cmd_new = qmp_marshal_input_migrate_set_speed,
},
SQMP
migrate_set_speed
-----------------
Set maximum speed for migrations.
Arguments:
- "value": maximum speed, in bytes per second (json-int)
Example:
-> { "execute": "migrate_set_speed", "arguments": { "value": 1024 } }
<- { "return": {} }
EQMP
{
.name = "migrate_set_downtime",
.args_type = "value:T",
.mhandler.cmd_new = qmp_marshal_input_migrate_set_downtime,
},
SQMP
migrate_set_downtime
--------------------
Set maximum tolerated downtime (in seconds) for migrations.
Arguments:
- "value": maximum downtime (json-number)
Example:
-> { "execute": "migrate_set_downtime", "arguments": { "value": 0.1 } }
<- { "return": {} }
EQMP
{
.name = "client_migrate_info",
.args_type = "protocol:s,hostname:s,port:i?,tls-port:i?,cert-subject:s?",
.params = "protocol hostname port tls-port cert-subject",
.help = "set migration information for remote display",
.mhandler.cmd_new = qmp_marshal_input_client_migrate_info,
},
SQMP
client_migrate_info
-------------------
Set migration information for remote display. This makes the server
ask the client to automatically reconnect using the new parameters
once migration finished successfully. Only implemented for SPICE.
Arguments:
- "protocol": must be "spice" (json-string)
- "hostname": migration target hostname (json-string)
- "port": spice tcp port for plaintext channels (json-int, optional)
- "tls-port": spice tcp port for tls-secured channels (json-int, optional)
- "cert-subject": server certificate subject (json-string, optional)
Example:
-> { "execute": "client_migrate_info",
"arguments": { "protocol": "spice",
"hostname": "virt42.lab.kraxel.org",
"port": 1234 } }
<- { "return": {} }
EQMP
{
.name = "dump-guest-memory",
.args_type = "paging:b,protocol:s,begin:i?,end:i?,format:s?",
.params = "-p protocol [begin] [length] [format]",
.help = "dump guest memory to file",
.mhandler.cmd_new = qmp_marshal_input_dump_guest_memory,
},
SQMP
dump
Dump guest memory to file. The file can be processed with crash or gdb.
Arguments:
- "paging": do paging to get guest's memory mapping (json-bool)
- "protocol": destination file(started with "file:") or destination file
descriptor (started with "fd:") (json-string)
- "begin": the starting physical address. It's optional, and should be specified
with length together (json-int)
- "length": the memory size, in bytes. It's optional, and should be specified
with begin together (json-int)
- "format": the format of guest memory dump. It's optional, and can be
elf|kdump-zlib|kdump-lzo|kdump-snappy, but non-elf formats will
conflict with paging and filter, ie. begin and length (json-string)
Example:
-> { "execute": "dump-guest-memory", "arguments": { "protocol": "fd:dump" } }
<- { "return": {} }
Notes:
(1) All boolean arguments default to false
EQMP
{
.name = "query-dump-guest-memory-capability",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_dump_guest_memory_capability,
},
SQMP
query-dump-guest-memory-capability
----------
Show available formats for 'dump-guest-memory'
Example:
-> { "execute": "query-dump-guest-memory-capability" }
<- { "return": { "formats":
["elf", "kdump-zlib", "kdump-lzo", "kdump-snappy"] }
EQMP
{
.name = "netdev_add",
.args_type = "netdev:O",
.mhandler.cmd_new = qmp_netdev_add,
},
SQMP
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" } }
<- { "return": {} }
Note: The supported device options are the same ones supported by the '-netdev'
command-line argument, which are listed in the '-help' output or QEMU's
manual
EQMP
{
.name = "netdev_del",
.args_type = "id:s",
.mhandler.cmd_new = qmp_marshal_input_netdev_del,
},
SQMP
netdev_del
----------
Remove host network device.
Arguments:
- "id": the device's ID, must be unique (json-string)
Example:
-> { "execute": "netdev_del", "arguments": { "id": "netdev1" } }
<- { "return": {} }
EQMP
{
.name = "object-add",
.args_type = "qom-type:s,id:s,props:q?",
.mhandler.cmd_new = qmp_object_add,
},
SQMP
object-add
----------
Create QOM object.
Arguments:
- "qom-type": the object's QOM type, i.e. the class name (json-string)
- "id": the object's ID, must be unique (json-string)
- "props": a dictionary of object property values (optional, json-dict)
Example:
-> { "execute": "object-add", "arguments": { "qom-type": "rng-random", "id": "rng1",
"props": { "filename": "/dev/hwrng" } } }
<- { "return": {} }
EQMP
{
.name = "object-del",
.args_type = "id:s",
.mhandler.cmd_new = qmp_marshal_input_object_del,
},
SQMP
object-del
----------
Remove QOM object.
Arguments:
- "id": the object's ID (json-string)
Example:
-> { "execute": "object-del", "arguments": { "id": "rng1" } }
<- { "return": {} }
EQMP
{
.name = "block_resize",
.args_type = "device:s?,node-name:s?,size:o",
.mhandler.cmd_new = qmp_marshal_input_block_resize,
},
SQMP
block_resize
------------
Resize a block image while a guest is running.
Arguments:
- "device": the device's ID, must be unique (json-string)
- "node-name": the node name in the block driver state graph (json-string)
- "size": new size
Example:
-> { "execute": "block_resize", "arguments": { "device": "scratch", "size": 1073741824 } }
<- { "return": {} }
EQMP
{
.name = "block-stream",
.args_type = "device:B,base:s?,speed:o?,backing-file:s?,on-error:s?",
.mhandler.cmd_new = qmp_marshal_input_block_stream,
},
SQMP
block-stream
------------
Copy data from a backing file into a block device.
Arguments:
- "device": The device's ID, must be unique (json-string)
- "base": The file name of the backing image above which copying starts
(json-string, optional)
- "backing-file": The backing file string to write into the active layer. This
filename is not validated.
If a pathname string is such that it cannot be resolved by
QEMU, that means that subsequent QMP or HMP commands must use
node-names for the image in question, as filename lookup
methods will fail.
If not specified, QEMU will automatically determine the
backing file string to use, or error out if there is no
obvious choice. Care should be taken when specifying the
string, to specify a valid filename or protocol.
(json-string, optional) (Since 2.1)
- "speed": the maximum speed, in bytes per second (json-int, optional)
- "on-error": the action to take on an error (default 'report'). 'stop' and
'enospc' can only be used if the block device supports io-status.
(json-string, optional) (Since 2.1)
Example:
-> { "execute": "block-stream", "arguments": { "device": "virtio0",
"base": "/tmp/master.qcow2" } }
<- { "return": {} }
EQMP
{
.name = "block-commit",
.args_type = "device:B,base:s?,top:s?,backing-file:s?,speed:o?",
.mhandler.cmd_new = qmp_marshal_input_block_commit,
},
SQMP
block-commit
------------
Live commit of data from overlay image nodes into backing nodes - i.e., writes
data between 'top' and 'base' into 'base'.
Arguments:
- "device": The device's ID, must be unique (json-string)
- "base": The file name of the backing image to write data into.
If not specified, this is the deepest backing image
(json-string, optional)
- "top": The file name of the backing image within the image chain,
which contains the topmost data to be committed down. If
not specified, this is the active layer. (json-string, optional)
- backing-file: The backing file string to write into the overlay
image of 'top'. If 'top' is the active layer,
specifying a backing file string is an error. This
filename is not validated.
If a pathname string is such that it cannot be
resolved by QEMU, that means that subsequent QMP or
HMP commands must use node-names for the image in
question, as filename lookup methods will fail.
If not specified, QEMU will automatically determine
the backing file string to use, or error out if
there is no obvious choice. Care should be taken
when specifying the string, to specify a valid
filename or protocol.
(json-string, optional) (Since 2.1)
If top == base, that is an error.
If top == active, the job will not be completed by itself,
user needs to complete the job with the block-job-complete
command after getting the ready event. (Since 2.0)
If the base image is smaller than top, then the base image
will be resized to be the same size as top. If top is
smaller than the base image, the base will not be
truncated. If you want the base image size to match the
size of the smaller top, you can safely truncate it
yourself once the commit operation successfully completes.
(json-string)
- "speed": the maximum speed, in bytes per second (json-int, optional)
Example:
-> { "execute": "block-commit", "arguments": { "device": "virtio0",
"top": "/tmp/snap1.qcow2" } }
<- { "return": {} }
EQMP
{
.name = "drive-backup",
.args_type = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?,"
"bitmap:s?,on-source-error:s?,on-target-error:s?",
.mhandler.cmd_new = qmp_marshal_input_drive_backup,
},
SQMP
drive-backup
------------
Start a point-in-time copy of a block device to a new destination. The
status of ongoing drive-backup operations can be checked with
query-block-jobs where the BlockJobInfo.type field has the value 'backup'.
The operation can be stopped before it has completed using the
block-job-cancel command.
Arguments:
- "device": the name of the device which should be copied.
(json-string)
- "target": the target of the new image. If the file exists, or if it is a
device, the existing file/device will be used as the new
destination. If it does not exist, a new file will be created.
(json-string)
- "format": the format of the new destination, default is to probe if 'mode' is
'existing', else the format of the source
(json-string, optional)
- "sync": what parts of the disk image should be copied to the destination;
possibilities include "full" for all the disk, "top" for only the sectors
allocated in the topmost image, "incremental" for only the dirty sectors in
the bitmap, or "none" to only replicate new I/O (MirrorSyncMode).
- "bitmap": dirty bitmap name for sync==incremental. Must be present if sync
is "incremental", must NOT be present otherwise.
- "mode": whether and how QEMU should create a new image
(NewImageMode, optional, default 'absolute-paths')
- "speed": the maximum speed, in bytes per second (json-int, optional)
- "on-source-error": the action to take on an error on the source, default
'report'. 'stop' and 'enospc' can only be used
if the block device supports io-status.
(BlockdevOnError, optional)
- "on-target-error": the action to take on an error on the target, default
'report' (no limitations, since this applies to
a different block device than device).
(BlockdevOnError, optional)
Example:
-> { "execute": "drive-backup", "arguments": { "device": "drive0",
"sync": "full",
"target": "backup.img" } }
<- { "return": {} }
EQMP
{
.name = "blockdev-backup",
.args_type = "sync:s,device:B,target:B,speed:i?,"
"on-source-error:s?,on-target-error:s?",
.mhandler.cmd_new = qmp_marshal_input_blockdev_backup,
},
SQMP
blockdev-backup
---------------
The device version of drive-backup: this command takes an existing named device
as backup target.
Arguments:
- "device": the name of the device which should be copied.
(json-string)
- "target": the name of the backup target device. (json-string)
- "sync": what parts of the disk image should be copied to the destination;
possibilities include "full" for all the disk, "top" for only the
sectors allocated in the topmost image, or "none" to only replicate
new I/O (MirrorSyncMode).
- "speed": the maximum speed, in bytes per second (json-int, optional)
- "on-source-error": the action to take on an error on the source, default
'report'. 'stop' and 'enospc' can only be used
if the block device supports io-status.
(BlockdevOnError, optional)
- "on-target-error": the action to take on an error on the target, default
'report' (no limitations, since this applies to
a different block device than device).
(BlockdevOnError, optional)
Example:
-> { "execute": "blockdev-backup", "arguments": { "device": "src-id",
"sync": "full",
"target": "tgt-id" } }
<- { "return": {} }
EQMP
{
.name = "block-job-set-speed",
.args_type = "device:B,speed:o",
.mhandler.cmd_new = qmp_marshal_input_block_job_set_speed,
},
{
.name = "block-job-cancel",
.args_type = "device:B,force:b?",
.mhandler.cmd_new = qmp_marshal_input_block_job_cancel,
},
{
.name = "block-job-pause",
.args_type = "device:B",
.mhandler.cmd_new = qmp_marshal_input_block_job_pause,
},
{
.name = "block-job-resume",
.args_type = "device:B",
.mhandler.cmd_new = qmp_marshal_input_block_job_resume,
},
{
.name = "block-job-complete",
.args_type = "device:B",
.mhandler.cmd_new = qmp_marshal_input_block_job_complete,
},
{
.name = "transaction",
.args_type = "actions:q",
.mhandler.cmd_new = qmp_marshal_input_transaction,
},
SQMP
transaction
-----------
Atomically operate on one or more block devices. The only supported operations
for now are drive-backup, internal and external snapshotting. A list of
dictionaries is accepted, that contains the actions to be performed.
If there is any failure performing any of the operations, all operations
for the group are abandoned.
For external snapshots, the dictionary contains the device, the file to use for
the new snapshot, and the format. The default format, if not specified, is
qcow2.
Each new snapshot defaults to being created by QEMU (wiping any
contents if the file already exists), but it is also possible to reuse
an externally-created file. In the latter case, you should ensure that
the new image file has the same contents as the current one; QEMU cannot
perform any meaningful check. Typically this is achieved by using the
current image file as the backing file for the new image.
On failure, the original disks pre-snapshot attempt will be used.
For internal snapshots, the dictionary contains the device and the snapshot's
name. If an internal snapshot matching name already exists, the request will
be rejected. Only some image formats support it, for example, qcow2, rbd,
and sheepdog.
On failure, qemu will try delete the newly created internal snapshot in the
transaction. When an I/O error occurs during deletion, the user needs to fix
it later with qemu-img or other command.
Arguments:
actions array:
- "type": the operation to perform. The only supported
value is "blockdev-snapshot-sync". (json-string)
- "data": a dictionary. The contents depend on the value
of "type". When "type" is "blockdev-snapshot-sync":
- "device": device name to snapshot (json-string)
- "node-name": graph node name to snapshot (json-string)
- "snapshot-file": name of new image file (json-string)
- "snapshot-node-name": graph node name of the new snapshot (json-string)
- "format": format of new image (json-string, optional)
- "mode": whether and how QEMU should create the snapshot file
(NewImageMode, optional, default "absolute-paths")
When "type" is "blockdev-snapshot-internal-sync":
- "device": device name to snapshot (json-string)
- "name": name of the new snapshot (json-string)
Example:
-> { "execute": "transaction",
"arguments": { "actions": [
{ "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd0",
"snapshot-file": "/some/place/my-image",
"format": "qcow2" } },
{ "type": "blockdev-snapshot-sync", "data" : { "node-name": "myfile",
"snapshot-file": "/some/place/my-image2",
"snapshot-node-name": "node3432",
"mode": "existing",
"format": "qcow2" } },
{ "type": "blockdev-snapshot-sync", "data" : { "device": "ide-hd1",
"snapshot-file": "/some/place/my-image2",
"mode": "existing",
"format": "qcow2" } },
{ "type": "blockdev-snapshot-internal-sync", "data" : {
"device": "ide-hd2",
"name": "snapshot0" } } ] } }
<- { "return": {} }
EQMP
{
.name = "block-dirty-bitmap-add",
.args_type = "node:B,name:s,granularity:i?",
.mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_add,
},
SQMP
block-dirty-bitmap-add
----------------------
Since 2.4
Create a dirty bitmap with a name on the device, and start tracking the writes.
Arguments:
- "node": device/node on which to create dirty bitmap (json-string)
- "name": name of the new dirty bitmap (json-string)
- "granularity": granularity to track writes with (int, optional)
Example:
-> { "execute": "block-dirty-bitmap-add", "arguments": { "node": "drive0",
"name": "bitmap0" } }
<- { "return": {} }
EQMP
{
.name = "block-dirty-bitmap-remove",
.args_type = "node:B,name:s",
.mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_remove,
},
SQMP
block-dirty-bitmap-remove
-------------------------
Since 2.4
Stop write tracking and remove the dirty bitmap that was created with
block-dirty-bitmap-add.
Arguments:
- "node": device/node on which to remove dirty bitmap (json-string)
- "name": name of the dirty bitmap to remove (json-string)
Example:
-> { "execute": "block-dirty-bitmap-remove", "arguments": { "node": "drive0",
"name": "bitmap0" } }
<- { "return": {} }
EQMP
{
.name = "block-dirty-bitmap-clear",
.args_type = "node:B,name:s",
.mhandler.cmd_new = qmp_marshal_input_block_dirty_bitmap_clear,
},
SQMP
block-dirty-bitmap-clear
------------------------
Since 2.4
Reset the dirty bitmap associated with a node so that an incremental backup
from this point in time forward will only backup clusters modified after this
clear operation.
Arguments:
- "node": device/node on which to remove dirty bitmap (json-string)
- "name": name of the dirty bitmap to remove (json-string)
Example:
-> { "execute": "block-dirty-bitmap-clear", "arguments": { "node": "drive0",
"name": "bitmap0" } }
<- { "return": {} }
EQMP
{
.name = "blockdev-snapshot-sync",
.args_type = "device:s?,node-name:s?,snapshot-file:s,snapshot-node-name:s?,format:s?,mode:s?",
.mhandler.cmd_new = qmp_marshal_input_blockdev_snapshot_sync,
},
SQMP
blockdev-snapshot-sync
----------------------
Synchronous snapshot of a block device. snapshot-file specifies the
target of the new image. If the file exists, or if it is a device, the
snapshot will be created in the existing file/device. If does not
exist, a new file will be created. format specifies the format of the
snapshot image, default is qcow2.
Arguments:
- "device": device name to snapshot (json-string)
- "node-name": graph node name to snapshot (json-string)
- "snapshot-file": name of new image file (json-string)
- "snapshot-node-name": graph node name of the new snapshot (json-string)
- "mode": whether and how QEMU should create the snapshot file
(NewImageMode, optional, default "absolute-paths")
- "format": format of new image (json-string, optional)
Example:
-> { "execute": "blockdev-snapshot-sync", "arguments": { "device": "ide-hd0",
"snapshot-file":
"/some/place/my-image",
"format": "qcow2" } }
<- { "return": {} }
EQMP
{
.name = "blockdev-snapshot-internal-sync",
.args_type = "device:B,name:s",
.mhandler.cmd_new = qmp_marshal_input_blockdev_snapshot_internal_sync,
},
SQMP
blockdev-snapshot-internal-sync
-------------------------------
Synchronously take an internal snapshot of a block device when the format of
image used supports it. If the name is an empty string, or a snapshot with
name already exists, the operation will fail.
Arguments:
- "device": device name to snapshot (json-string)
- "name": name of the new snapshot (json-string)
Example:
-> { "execute": "blockdev-snapshot-internal-sync",
"arguments": { "device": "ide-hd0",
"name": "snapshot0" }
}
<- { "return": {} }
EQMP
{
.name = "blockdev-snapshot-delete-internal-sync",
.args_type = "device:B,id:s?,name:s?",
.mhandler.cmd_new =
qmp_marshal_input_blockdev_snapshot_delete_internal_sync,
},
SQMP
blockdev-snapshot-delete-internal-sync
--------------------------------------
Synchronously delete an internal snapshot of a block device when the format of
image used supports it. The snapshot is identified by name or id or both. One
of name or id is required. If the snapshot is not found, the operation will
fail.
Arguments:
- "device": device name (json-string)
- "id": ID of the snapshot (json-string, optional)
- "name": name of the snapshot (json-string, optional)
Example:
-> { "execute": "blockdev-snapshot-delete-internal-sync",
"arguments": { "device": "ide-hd0",
"name": "snapshot0" }
}
<- { "return": {
"id": "1",
"name": "snapshot0",
"vm-state-size": 0,
"date-sec": 1000012,
"date-nsec": 10,
"vm-clock-sec": 100,
"vm-clock-nsec": 20
}
}
EQMP
{
.name = "drive-mirror",
.args_type = "sync:s,device:B,target:s,speed:i?,mode:s?,format:s?,"
"node-name:s?,replaces:s?,"
"on-source-error:s?,on-target-error:s?,"
"unmap:b?,"
"granularity:i?,buf-size:i?",
.mhandler.cmd_new = qmp_marshal_input_drive_mirror,
},
SQMP
drive-mirror
------------
Start mirroring a block device's writes to a new destination. target
specifies the target of the new image. If the file exists, or if it is
a device, it will be used as the new destination for writes. If it does not
exist, a new file will be created. format specifies the format of the
mirror image, default is to probe if mode='existing', else the format
of the source.
Arguments:
- "device": device name to operate on (json-string)
- "target": name of new image file (json-string)
- "format": format of new image (json-string, optional)
- "node-name": the name of the new block driver state in the node graph
(json-string, optional)
- "replaces": the block driver node name to replace when finished
(json-string, optional)
- "mode": how an image file should be created into the target
file/device (NewImageMode, optional, default 'absolute-paths')
- "speed": maximum speed of the streaming job, in bytes per second
(json-int)
- "granularity": granularity of the dirty bitmap, in bytes (json-int, optional)
- "buf_size": maximum amount of data in flight from source to target, in bytes
(json-int, default 10M)
- "sync": what parts of the disk image should be copied to the destination;
possibilities include "full" for all the disk, "top" for only the sectors
allocated in the topmost image, or "none" to only replicate new I/O
(MirrorSyncMode).
- "on-source-error": the action to take on an error on the source
(BlockdevOnError, default 'report')
- "on-target-error": the action to take on an error on the target
(BlockdevOnError, default 'report')
- "unmap": whether the target sectors should be discarded where source has only
zeroes. (json-bool, optional, default true)
The default value of the granularity is the image cluster size clamped
between 4096 and 65536, if the image format defines one. If the format
does not define a cluster size, the default value of the granularity
is 65536.
Example:
-> { "execute": "drive-mirror", "arguments": { "device": "ide-hd0",
"target": "/some/place/my-image",
"sync": "full",
"format": "qcow2" } }
<- { "return": {} }
EQMP
{
.name = "change-backing-file",
.args_type = "device:s,image-node-name:s,backing-file:s",
.mhandler.cmd_new = qmp_marshal_input_change_backing_file,
},
SQMP
change-backing-file
-------------------
Since: 2.1
Change the backing file in the image file metadata. This does not cause
QEMU to reopen the image file to reparse the backing filename (it may,
however, perform a reopen to change permissions from r/o -> r/w -> r/o,
if needed). The new backing file string is written into the image file
metadata, and the QEMU internal strings are updated.
Arguments:
- "image-node-name": The name of the block driver state node of the
image to modify. The "device" is argument is used to
verify "image-node-name" is in the chain described by
"device".
(json-string, optional)
- "device": The name of the device.
(json-string)
- "backing-file": The string to write as the backing file. This string is
not validated, so care should be taken when specifying
the string or the image chain may not be able to be
reopened again.
(json-string)
Returns: Nothing on success
If "device" does not exist or cannot be determined, DeviceNotFound
EQMP
{
.name = "balloon",
.args_type = "value:M",
.mhandler.cmd_new = qmp_marshal_input_balloon,
},
SQMP
balloon
-------
Request VM to change its memory allocation (in bytes).
Arguments:
- "value": New memory allocation (json-int)
Example:
-> { "execute": "balloon", "arguments": { "value": 536870912 } }
<- { "return": {} }
EQMP
{
.name = "set_link",
.args_type = "name:s,up:b",
.mhandler.cmd_new = qmp_marshal_input_set_link,
},
SQMP
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 } }
<- { "return": {} }
EQMP
{
.name = "getfd",
.args_type = "fdname:s",
.params = "getfd name",
.help = "receive a file descriptor via SCM rights and assign it a name",
.mhandler.cmd_new = qmp_marshal_input_getfd,
},
SQMP
getfd
-----
Receive a file descriptor via SCM rights and assign it a name.
Arguments:
- "fdname": file descriptor name (json-string)
Example:
-> { "execute": "getfd", "arguments": { "fdname": "fd1" } }
<- { "return": {} }
Notes:
(1) If the name specified by the "fdname" argument already exists,
the file descriptor assigned to it will be closed and replaced
by the received file descriptor.
(2) The 'closefd' command can be used to explicitly close the file
descriptor when it is no longer needed.
EQMP
{
.name = "closefd",
.args_type = "fdname:s",
.params = "closefd name",
.help = "close a file descriptor previously passed via SCM rights",
.mhandler.cmd_new = qmp_marshal_input_closefd,
},
SQMP
closefd
-------
Close a file descriptor previously passed via SCM rights.
Arguments:
- "fdname": file descriptor name (json-string)
Example:
-> { "execute": "closefd", "arguments": { "fdname": "fd1" } }
<- { "return": {} }
EQMP
{
.name = "add-fd",
.args_type = "fdset-id:i?,opaque:s?",
.params = "add-fd fdset-id opaque",
.help = "Add a file descriptor, that was passed via SCM rights, to an fd set",
.mhandler.cmd_new = qmp_marshal_input_add_fd,
},
SQMP
add-fd
-------
Add a file descriptor, that was passed via SCM rights, to an fd set.
Arguments:
- "fdset-id": The ID of the fd set to add the file descriptor to.
(json-int, optional)
- "opaque": A free-form string that can be used to describe the fd.
(json-string, optional)
Return a json-object with the following information:
- "fdset-id": The ID of the fd set that the fd was added to. (json-int)
- "fd": The file descriptor that was received via SCM rights and added to the
fd set. (json-int)
Example:
-> { "execute": "add-fd", "arguments": { "fdset-id": 1 } }
<- { "return": { "fdset-id": 1, "fd": 3 } }
Notes:
(1) The list of fd sets is shared by all monitor connections.
(2) If "fdset-id" is not specified, a new fd set will be created.
EQMP
{
.name = "remove-fd",
.args_type = "fdset-id:i,fd:i?",
.params = "remove-fd fdset-id fd",
.help = "Remove a file descriptor from an fd set",
.mhandler.cmd_new = qmp_marshal_input_remove_fd,
},
SQMP
remove-fd
---------
Remove a file descriptor from an fd set.
Arguments:
- "fdset-id": The ID of the fd set that the file descriptor belongs to.
(json-int)
- "fd": The file descriptor that is to be removed. (json-int, optional)
Example:
-> { "execute": "remove-fd", "arguments": { "fdset-id": 1, "fd": 3 } }
<- { "return": {} }
Notes:
(1) The list of fd sets is shared by all monitor connections.
(2) If "fd" is not specified, all file descriptors in "fdset-id" will be
removed.
EQMP
{
.name = "query-fdsets",
.args_type = "",
.help = "Return information describing all fd sets",
.mhandler.cmd_new = qmp_marshal_input_query_fdsets,
},
SQMP
query-fdsets
-------------
Return information describing all fd sets.
Arguments: None
Example:
-> { "execute": "query-fdsets" }
<- { "return": [
{
"fds": [
{
"fd": 30,
"opaque": "rdonly:/path/to/file"
},
{
"fd": 24,
"opaque": "rdwr:/path/to/file"
}
],
"fdset-id": 1
},
{
"fds": [
{
"fd": 28
},
{
"fd": 29
}
],
"fdset-id": 0
}
]
}
Note: The list of fd sets is shared by all monitor connections.
EQMP
{
.name = "block_passwd",
.args_type = "device:s?,node-name:s?,password:s",
.mhandler.cmd_new = qmp_marshal_input_block_passwd,
},
SQMP
block_passwd
------------
Set the password of encrypted block devices.
Arguments:
- "device": device name (json-string)
- "node-name": name in the block driver state graph (json-string)
- "password": password (json-string)
Example:
-> { "execute": "block_passwd", "arguments": { "device": "ide0-hd0",
"password": "12345" } }
<- { "return": {} }
EQMP
{
.name = "block_set_io_throttle",
.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?,group:s?",
.mhandler.cmd_new = qmp_marshal_input_block_set_io_throttle,
},
SQMP
block_set_io_throttle
------------
Change I/O throttle limits for a block drive.
Arguments:
- "device": device name (json-string)
- "bps": total throughput limit in bytes per second (json-int)
- "bps_rd": read throughput limit in bytes per second (json-int)
- "bps_wr": write throughput limit in bytes per second (json-int)
- "iops": total I/O operations per second (json-int)
- "iops_rd": read I/O operations per second (json-int)
- "iops_wr": write I/O operations per second (json-int)
- "bps_max": total max in bytes (json-int)
- "bps_rd_max": read max in bytes (json-int)
- "bps_wr_max": write max in bytes (json-int)
- "iops_max": total I/O operations max (json-int)
- "iops_rd_max": read I/O operations max (json-int)
- "iops_wr_max": write I/O operations max (json-int)
- "iops_size": I/O size in bytes when limiting (json-int)
- "group": throttle group name (json-string)
Example:
-> { "execute": "block_set_io_throttle", "arguments": { "device": "virtio0",
"bps": 1000000,
"bps_rd": 0,
"bps_wr": 0,
"iops": 0,
"iops_rd": 0,
"iops_wr": 0,
"bps_max": 8000000,
"bps_rd_max": 0,
"bps_wr_max": 0,
"iops_max": 0,
"iops_rd_max": 0,
"iops_wr_max": 0,
"iops_size": 0 } }
<- { "return": {} }
EQMP
{
.name = "set_password",
.args_type = "protocol:s,password:s,connected:s?",
.mhandler.cmd_new = qmp_marshal_input_set_password,
},
SQMP
set_password
------------
Set the password for vnc/spice protocols.
Arguments:
- "protocol": protocol name (json-string)
- "password": password (json-string)
- "connected": [ keep | disconnect | fail ] (json-string, optional)
Example:
-> { "execute": "set_password", "arguments": { "protocol": "vnc",
"password": "secret" } }
<- { "return": {} }
EQMP
{
.name = "expire_password",
.args_type = "protocol:s,time:s",
.mhandler.cmd_new = qmp_marshal_input_expire_password,
},
SQMP
expire_password
---------------
Set the password expire time for vnc/spice protocols.
Arguments:
- "protocol": protocol name (json-string)
- "time": [ now | never | +secs | secs ] (json-string)
Example:
-> { "execute": "expire_password", "arguments": { "protocol": "vnc",
"time": "+60" } }
<- { "return": {} }
EQMP
{
.name = "add_client",
.args_type = "protocol:s,fdname:s,skipauth:b?,tls:b?",
.mhandler.cmd_new = qmp_marshal_input_add_client,
},
SQMP
add_client
----------
Add a graphics client
Arguments:
- "protocol": protocol name (json-string)
- "fdname": file descriptor name (json-string)
- "skipauth": whether to skip authentication (json-bool, optional)
- "tls": whether to perform TLS (json-bool, optional)
Example:
-> { "execute": "add_client", "arguments": { "protocol": "vnc",
"fdname": "myclient" } }
<- { "return": {} }
EQMP
{
.name = "qmp_capabilities",
.args_type = "",
.params = "",
.help = "enable QMP capabilities",
.mhandler.cmd_new = qmp_capabilities,
},
SQMP
qmp_capabilities
----------------
Enable QMP capabilities.
Arguments: None.
Example:
-> { "execute": "qmp_capabilities" }
<- { "return": {} }
Note: This command must be issued before issuing any other command.
EQMP
{
.name = "human-monitor-command",
.args_type = "command-line:s,cpu-index:i?",
.mhandler.cmd_new = qmp_marshal_input_human_monitor_command,
},
SQMP
human-monitor-command
---------------------
Execute a Human Monitor command.
Arguments:
- command-line: the command name and its arguments, just like the
Human Monitor's shell (json-string)
- cpu-index: select the CPU number to be used by commands which access CPU
data, like 'info registers'. The Monitor selects CPU 0 if this
argument is not provided (json-int, optional)
Example:
-> { "execute": "human-monitor-command", "arguments": { "command-line": "info kvm" } }
<- { "return": "kvm support: enabled\r\n" }
Notes:
(1) The Human Monitor is NOT an stable interface, this means that command
names, arguments and responses can change or be removed at ANY time.
Applications that rely on long term stability guarantees should NOT
use this command
(2) Limitations:
o This command is stateless, this means that commands that depend
on state information (such as getfd) might not work
o Commands that prompt the user for data (eg. 'cont' when the block
device is encrypted) don't currently work
3. Query Commands
=================
HXCOMM Each query command below is inside a SQMP/EQMP section, do NOT change
HXCOMM this! We will possibly move query commands definitions inside those
HXCOMM sections, just like regular commands.
EQMP
SQMP
query-version
-------------
Show QEMU version.
Return a json-object with the following information:
- "qemu": A json-object containing three integer values:
- "major": QEMU's major version (json-int)
- "minor": QEMU's minor version (json-int)
- "micro": QEMU's micro version (json-int)
- "package": package's version (json-string)
Example:
-> { "execute": "query-version" }
<- {
"return":{
"qemu":{
"major":0,
"minor":11,
"micro":5
},
"package":""
}
}
EQMP
{
.name = "query-version",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_version,
},
SQMP
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:
-> { "execute": "query-commands" }
<- {
"return":[
{
"name":"query-balloon"
},
{
"name":"system_powerdown"
}
]
}
Note: This example has been shortened as the real response is too long.
EQMP
{
.name = "query-commands",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_commands,
},
SQMP
query-events
--------------
List QMP available events.
Each event is represented by a json-object, the returned value is a json-array
of all events.
Each json-object contains:
- "name": event's name (json-string)
Example:
-> { "execute": "query-events" }
<- {
"return":[
{
"name":"SHUTDOWN"
},
{
"name":"RESET"
}
]
}
Note: This example has been shortened as the real response is too long.
EQMP
{
.name = "query-events",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_events,
},
SQMP
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)
- "frontend-open": open/closed state of the frontend device attached to this
backend (json-bool)
Example:
-> { "execute": "query-chardev" }
<- {
"return": [
{
"label": "charchannel0",
"filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.agent,server",
"frontend-open": false
},
{
"label": "charmonitor",
"filename": "unix:/var/lib/libvirt/qemu/seabios.rhel6.monitor,server",
"frontend-open": true
},
{
"label": "charserial0",
"filename": "pty:/dev/pts/2",
"frontend-open": true
}
]
}
EQMP
{
.name = "query-chardev",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_chardev,
},
SQMP
query-chardev-backends
-------------
List available character device backends.
Each backend is represented by a json-object, the returned value is a json-array
of all backends.
Each json-object contains:
- "name": backend name (json-string)
Example:
-> { "execute": "query-chardev-backends" }
<- {
"return":[
{
"name":"udp"
},
{
"name":"tcp"
},
{
"name":"unix"
},
{
"name":"spiceport"
}
]
}
EQMP
{
.name = "query-chardev-backends",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_chardev_backends,
},
SQMP
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)
- deprecated, retained for backward compatibility
- Possible values: "unknown"
- "removable": true if the device is removable, false otherwise (json-bool)
- "locked": true if the device is locked, false otherwise (json-bool)
- "tray_open": only present if removable, true if the device has a tray,
and it is open (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)
- Possible values: "blkdebug", "bochs", "cloop", "dmg",
"file", "file", "ftp", "ftps", "host_cdrom",
"host_device", "http", "https",
"nbd", "parallels", "qcow", "qcow2", "raw",
"tftp", "vdi", "vmdk", "vpc", "vvfat"
- "backing_file": backing file name (json-string, optional)
- "backing_file_depth": number of files in the backing file chain (json-int)
- "encrypted": true if encrypted, false otherwise (json-bool)
- "bps": limit total bytes per second (json-int)
- "bps_rd": limit read bytes per second (json-int)
- "bps_wr": limit write bytes per second (json-int)
- "iops": limit total I/O operations per second (json-int)
- "iops_rd": limit read operations per second (json-int)
- "iops_wr": limit write operations per second (json-int)
- "bps_max": total max in bytes (json-int)
- "bps_rd_max": read max in bytes (json-int)
- "bps_wr_max": write max in bytes (json-int)
- "iops_max": total I/O operations max (json-int)
- "iops_rd_max": read I/O operations max (json-int)
- "iops_wr_max": write I/O operations max (json-int)
- "iops_size": I/O size when limiting by iops (json-int)
- "detect_zeroes": detect and optimize zero writing (json-string)
- Possible values: "off", "on", "unmap"
- "write_threshold": write offset threshold in bytes, a event will be
emitted if crossed. Zero if disabled (json-int)
- "image": the detail of the image, it is a json-object containing
the following:
- "filename": image file name (json-string)
- "format": image format (json-string)
- "virtual-size": image capacity in bytes (json-int)
- "dirty-flag": true if image is not cleanly closed, not present
means clean (json-bool, optional)
- "actual-size": actual size on disk in bytes of the image, not
present when image does not support thin
provision (json-int, optional)
- "cluster-size": size of a cluster in bytes, not present if image
format does not support it (json-int, optional)
- "encrypted": true if the image is encrypted, not present means
false or the image format does not support
encryption (json-bool, optional)
- "backing_file": backing file name, not present means no backing
file is used or the image format does not
support backing file chain
(json-string, optional)
- "full-backing-filename": full path of the backing file, not
present if it equals backing_file or no
backing file is used
(json-string, optional)
- "backing-filename-format": the format of the backing file, not
present means unknown or no backing
file (json-string, optional)
- "snapshots": the internal snapshot info, it is an optional list
of json-object containing the following:
- "id": unique snapshot id (json-string)
- "name": snapshot name (json-string)
- "vm-state-size": size of the VM state in bytes (json-int)
- "date-sec": UTC date of the snapshot in seconds (json-int)
- "date-nsec": fractional part in nanoseconds to be used with
date-sec (json-int)
- "vm-clock-sec": VM clock relative to boot in seconds
(json-int)
- "vm-clock-nsec": fractional part in nanoseconds to be used
with vm-clock-sec (json-int)
- "backing-image": the detail of the backing image, it is an
optional json-object only present when a
backing image present for this image
- "io-status": I/O operation status, only present if the device supports it
and the VM is configured to stop on errors. It's always reset
to "ok" when the "cont" command is issued (json_string, optional)
- Possible values: "ok", "failed", "nospace"
Example:
-> { "execute": "query-block" }
<- {
"return":[
{
"io-status": "ok",
"device":"ide0-hd0",
"locked":false,
"removable":false,
"inserted":{
"ro":false,
"drv":"qcow2",
"encrypted":false,
"file":"disks/test.qcow2",
"backing_file_depth":1,
"bps":1000000,
"bps_rd":0,
"bps_wr":0,
"iops":1000000,
"iops_rd":0,
"iops_wr":0,
"bps_max": 8000000,
"bps_rd_max": 0,
"bps_wr_max": 0,
"iops_max": 0,
"iops_rd_max": 0,
"iops_wr_max": 0,
"iops_size": 0,
"detect_zeroes": "on",
"write_threshold": 0,
"image":{
"filename":"disks/test.qcow2",
"format":"qcow2",
"virtual-size":2048000,
"backing_file":"base.qcow2",
"full-backing-filename":"disks/base.qcow2",
"backing-filename-format":"qcow2",
"snapshots":[
{
"id": "1",
"name": "snapshot1",
"vm-state-size": 0,
"date-sec": 10000200,
"date-nsec": 12,
"vm-clock-sec": 206,
"vm-clock-nsec": 30
}
],
"backing-image":{
"filename":"disks/base.qcow2",
"format":"qcow2",
"virtual-size":2048000
}
}
},
"type":"unknown"
},
{
"io-status": "ok",
"device":"ide1-cd0",
"locked":false,
"removable":true,
"type":"unknown"
},
{
"device":"floppy0",
"locked":false,
"removable":true,
"type":"unknown"
},
{
"device":"sd0",
"locked":false,
"removable":true,
"type":"unknown"
}
]
}
EQMP
{
.name = "query-block",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_block,
},
SQMP
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)
- "flush_operations": cache flush operations (json-int)
- "wr_total_time_ns": total time spend on writes in nano-seconds (json-int)
- "rd_total_time_ns": total time spend on reads in nano-seconds (json-int)
- "flush_total_time_ns": total time spend on cache flushes in nano-seconds (json-int)
- "wr_highest_offset": Highest offset of a sector written since the
BlockDriverState has been opened (json-int)
- "rd_merged": number of read requests that have been merged into
another request (json-int)
- "wr_merged": number of write requests that have been merged into
another request (json-int)
- "parent": Contains recursively the statistics of the underlying
protocol (e.g. the host file for a qcow2 image). If there is
no underlying protocol, this field is omitted
(json-object, optional)
Example:
-> { "execute": "query-blockstats" }
<- {
"return":[
{
"device":"ide0-hd0",
"parent":{
"stats":{
"wr_highest_offset":3686448128,
"wr_bytes":9786368,
"wr_operations":751,
"rd_bytes":122567168,
"rd_operations":36772
"wr_total_times_ns":313253456
"rd_total_times_ns":3465673657
"flush_total_times_ns":49653
"flush_operations":61,
"rd_merged":0,
"wr_merged":0
}
},
"stats":{
"wr_highest_offset":2821110784,
"wr_bytes":9786368,
"wr_operations":692,
"rd_bytes":122739200,
"rd_operations":36604
"flush_operations":51,
"wr_total_times_ns":313253456
"rd_total_times_ns":3465673657
"flush_total_times_ns":49653,
"rd_merged":0,
"wr_merged":0
}
},
{
"device":"ide1-cd0",
"stats":{
"wr_highest_offset":0,
"wr_bytes":0,
"wr_operations":0,
"rd_bytes":0,
"rd_operations":0
"flush_operations":0,
"wr_total_times_ns":0
"rd_total_times_ns":0
"flush_total_times_ns":0,
"rd_merged":0,
"wr_merged":0
}
},
{
"device":"floppy0",
"stats":{
"wr_highest_offset":0,
"wr_bytes":0,
"wr_operations":0,
"rd_bytes":0,
"rd_operations":0
"flush_operations":0,
"wr_total_times_ns":0
"rd_total_times_ns":0
"flush_total_times_ns":0,
"rd_merged":0,
"wr_merged":0
}
},
{
"device":"sd0",
"stats":{
"wr_highest_offset":0,
"wr_bytes":0,
"wr_operations":0,
"rd_bytes":0,
"rd_operations":0
"flush_operations":0,
"wr_total_times_ns":0
"rd_total_times_ns":0
"flush_total_times_ns":0,
"rd_merged":0,
"wr_merged":0
}
}
]
}
EQMP
{
.name = "query-blockstats",
.args_type = "query-nodes:b?",
.mhandler.cmd_new = qmp_marshal_input_query_blockstats,
},
SQMP
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)
- "qom_path": path to the CPU object in the QOM tree (json-str)
- 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)
- "thread_id": ID of the underlying host thread (json-int)
Example:
-> { "execute": "query-cpus" }
<- {
"return":[
{
"CPU":0,
"current":true,
"halted":false,
"qom_path":"/machine/unattached/device[0]",
"pc":3227107138,
"thread_id":3134
},
{
"CPU":1,
"current":false,
"halted":true,
"qom_path":"/machine/unattached/device[2]",
"pc":7108165,
"thread_id":3135
}
]
}
EQMP
{
.name = "query-cpus",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_cpus,
},
SQMP
query-iothreads
---------------
Returns a list of information about each iothread.
Note this list excludes the QEMU main loop thread, which is not declared
using the -object iothread command-line option. It is always the main thread
of the process.
Return a json-array. Each iothread is represented by a json-object, which contains:
- "id": name of iothread (json-str)
- "thread-id": ID of the underlying host thread (json-int)
Example:
-> { "execute": "query-iothreads" }
<- {
"return":[
{
"id":"iothread0",
"thread-id":3134
},
{
"id":"iothread1",
"thread-id":3135
}
]
}
EQMP
{
.name = "query-iothreads",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_iothreads,
},
SQMP
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": I/O memory range information, a json-object with the
following members:
- "base": base address, in bytes (json-int)
- "limit": limit address, in bytes (json-int)
- "memory_range": memory range information, a json-object with the
following members:
- "base": base address, in bytes (json-int)
- "limit": limit address, in bytes (json-int)
- "prefetchable_range": Prefetchable memory range information, a
json-object with the following members:
- "base": base address, in bytes (json-int)
- "limit": limit address, in bytes (json-int)
- "devices": a json-array of PCI devices if there's any attached, each
each element is represented by a json-object, which contains
the same members of the 'PCI device json-object' described
above (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:
-> { "execute": "query-pci" }
<- {
"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.
EQMP
{
.name = "query-pci",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_pci,
},
SQMP
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:
-> { "execute": "query-kvm" }
<- { "return": { "enabled": true, "present": true } }
EQMP
{
.name = "query-kvm",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_kvm,
},
SQMP
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)
- "status": one of the following values (json-string)
"debug" - QEMU is running on a debugger
"inmigrate" - guest is paused waiting for an incoming migration
"internal-error" - An internal error that prevents further guest
execution has occurred
"io-error" - the last IOP has failed and the device is configured
to pause on I/O errors
"paused" - guest has been paused via the 'stop' command
"postmigrate" - guest is paused following a successful 'migrate'
"prelaunch" - QEMU was started with -S and guest has not started
"finish-migrate" - guest is paused to finish the migration process
"restore-vm" - guest is paused to restore VM state
"running" - guest is actively running
"save-vm" - guest is paused to save the VM state
"shutdown" - guest is shut down (and -no-shutdown is in use)
"watchdog" - the watchdog action is configured to pause and
has been triggered
Example:
-> { "execute": "query-status" }
<- { "return": { "running": true, "singlestep": false, "status": "running" } }
EQMP
{
.name = "query-status",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_status,
},
SQMP
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:
-> { "execute": "query-mice" }
<- {
"return":[
{
"name":"QEMU Microsoft Mouse",
"index":0,
"current":false,
"absolute":false
},
{
"name":"QEMU PS/2 Mouse",
"index":1,
"current":true,
"absolute":true
}
]
}
EQMP
{
.name = "query-mice",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_mice,
},
SQMP
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)
- Possible values: "ipv4", "ipv6", "unix", "unknown"
- "service": server's port number (json-string)
- "auth": authentication method (json-string)
- Possible values: "invalid", "none", "ra2", "ra2ne", "sasl", "tight",
"tls", "ultra", "unknown", "vencrypt", "vencrypt",
"vencrypt+plain", "vencrypt+tls+none",
"vencrypt+tls+plain", "vencrypt+tls+sasl",
"vencrypt+tls+vnc", "vencrypt+x509+none",
"vencrypt+x509+plain", "vencrypt+x509+sasl",
"vencrypt+x509+vnc", "vnc"
- "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)
- Possible values: "ipv4", "ipv6", "unix", "unknown"
- "service": client's port number (json-string)
- "x509_dname": TLS dname (json-string, optional)
- "sasl_username": SASL username (json-string, optional)
Example:
-> { "execute": "query-vnc" }
<- {
"return":{
"enabled":true,
"host":"0.0.0.0",
"service":"50402",
"auth":"vnc",
"family":"ipv4",
"clients":[
{
"host":"127.0.0.1",
"service":"50401",
"family":"ipv4"
}
]
}
}
EQMP
{
.name = "query-vnc",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_vnc,
},
{
.name = "query-vnc-servers",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_vnc_servers,
},
SQMP
query-spice
-----------
Show SPICE 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)
- "port": server's port number (json-int, optional)
- "tls-port": server's port number (json-int, optional)
- "auth": authentication method (json-string)
- Possible values: "none", "spice"
- "channels": a json-array of all active channels clients
Channels are described by a json-object, each one contain the following:
- "host": client's IP address (json-string)
- "family": address family (json-string)
- Possible values: "ipv4", "ipv6", "unix", "unknown"
- "port": client's port number (json-string)
- "connection-id": spice connection id. All channels with the same id
belong to the same spice session (json-int)
- "channel-type": channel type. "1" is the main control channel, filter for
this one if you want track spice sessions only (json-int)
- "channel-id": channel id. Usually "0", might be different needed when
multiple channels of the same type exist, such as multiple
display channels in a multihead setup (json-int)
- "tls": whether the channel is encrypted (json-bool)
Example:
-> { "execute": "query-spice" }
<- {
"return": {
"enabled": true,
"auth": "spice",
"port": 5920,
"tls-port": 5921,
"host": "0.0.0.0",
"channels": [
{
"port": "54924",
"family": "ipv4",
"channel-type": 1,
"connection-id": 1804289383,
"host": "127.0.0.1",
"channel-id": 0,
"tls": true
},
{
"port": "36710",
"family": "ipv4",
"channel-type": 4,
"connection-id": 1804289383,
"host": "127.0.0.1",
"channel-id": 0,
"tls": false
},
[ ... more channels follow ... ]
]
}
}
EQMP
#if defined(CONFIG_SPICE)
{
.name = "query-spice",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_spice,
},
#endif
SQMP
query-name
----------
Show VM name.
Return a json-object with the following information:
- "name": VM's name (json-string, optional)
Example:
-> { "execute": "query-name" }
<- { "return": { "name": "qemu-name" } }
EQMP
{
.name = "query-name",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_name,
},
SQMP
query-uuid
----------
Show VM UUID.
Return a json-object with the following information:
- "UUID": Universally Unique Identifier (json-string)
Example:
-> { "execute": "query-uuid" }
<- { "return": { "UUID": "550e8400-e29b-41d4-a716-446655440000" } }
EQMP
{
.name = "query-uuid",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_uuid,
},
SQMP
query-command-line-options
--------------------------
Show command line option schema.
Return a json-array of command line option schema for all options (or for
the given option), returning an error if the given option doesn't exist.
Each array entry contains the following:
- "option": option name (json-string)
- "parameters": a json-array describes all parameters of the option:
- "name": parameter name (json-string)
- "type": parameter type (one of 'string', 'boolean', 'number',
or 'size')
- "help": human readable description of the parameter
(json-string, optional)
- "default": default value string for the parameter
(json-string, optional)
Example:
-> { "execute": "query-command-line-options", "arguments": { "option": "option-rom" } }
<- { "return": [
{
"parameters": [
{
"name": "romfile",
"type": "string"
},
{
"name": "bootindex",
"type": "number"
}
],
"option": "option-rom"
}
]
}
EQMP
{
.name = "query-command-line-options",
.args_type = "option:s?",
.mhandler.cmd_new = qmp_marshal_input_query_command_line_options,
},
SQMP
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)
- Possible values: "setup", "active", "completed", "failed", "cancelled"
- "total-time": total amount of ms since migration started. If
migration has ended, it returns the total migration
time (json-int)
- "setup-time" amount of setup time in milliseconds _before_ the
iterations begin but _after_ the QMP command is issued.
This is designed to provide an accounting of any activities
(such as RDMA pinning) which may be expensive, but do not
actually occur during the iterative migration rounds
themselves. (json-int)
- "downtime": only present when migration has finished correctly
total amount in ms for downtime that happened (json-int)
- "expected-downtime": only present while migration is active
total amount in ms for downtime that was calculated on
the last bitmap round (json-int)
- "ram": only present if "status" is "active", it is a json-object with the
following RAM information:
- "transferred": amount transferred in bytes (json-int)
- "remaining": amount remaining to transfer in bytes (json-int)
- "total": total amount of memory in bytes (json-int)
- "duplicate": number of pages filled entirely with the same
byte (json-int)
These are sent over the wire much more efficiently.
- "skipped": number of skipped zero pages (json-int)
- "normal" : number of whole pages transferred. I.e. they
were not sent as duplicate or xbzrle pages (json-int)
- "normal-bytes" : number of bytes transferred in whole
pages. This is just normal pages times size of one page,
but this way upper levels don't need to care about page
size (json-int)
- "dirty-sync-count": times that dirty ram was synchronized (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:
- "transferred": amount transferred in bytes (json-int)
- "remaining": amount remaining to transfer in bytes json-int)
- "total": total disk size in bytes (json-int)
- "xbzrle-cache": only present if XBZRLE is active.
It is a json-object with the following XBZRLE information:
- "cache-size": XBZRLE cache size in bytes
- "bytes": number of bytes transferred for XBZRLE compressed pages
- "pages": number of XBZRLE compressed pages
- "cache-miss": number of XBRZRLE page cache misses
- "cache-miss-rate": rate of XBRZRLE page cache misses
- "overflow": number of times XBZRLE overflows. This means
that the XBZRLE encoding was bigger than just sent the
whole page, and then we sent the whole page instead (as as
normal page).
Examples:
1. Before the first migration
-> { "execute": "query-migrate" }
<- { "return": {} }
2. Migration is done and has succeeded
-> { "execute": "query-migrate" }
<- { "return": {
"status": "completed",
"ram":{
"transferred":123,
"remaining":123,
"total":246,
"total-time":12345,
"setup-time":12345,
"downtime":12345,
"duplicate":123,
"normal":123,
"normal-bytes":123456,
"dirty-sync-count":15
}
}
}
3. Migration is done and has failed
-> { "execute": "query-migrate" }
<- { "return": { "status": "failed" } }
4. Migration is being performed and is not a block migration:
-> { "execute": "query-migrate" }
<- {
"return":{
"status":"active",
"ram":{
"transferred":123,
"remaining":123,
"total":246,
"total-time":12345,
"setup-time":12345,
"expected-downtime":12345,
"duplicate":123,
"normal":123,
"normal-bytes":123456,
"dirty-sync-count":15
}
}
}
5. Migration is being performed and is a block migration:
-> { "execute": "query-migrate" }
<- {
"return":{
"status":"active",
"ram":{
"total":1057024,
"remaining":1053304,
"transferred":3720,
"total-time":12345,
"setup-time":12345,
"expected-downtime":12345,
"duplicate":123,
"normal":123,
"normal-bytes":123456,
"dirty-sync-count":15
},
"disk":{
"total":20971520,
"remaining":20880384,
"transferred":91136
}
}
}
6. Migration is being performed and XBZRLE is active:
-> { "execute": "query-migrate" }
<- {
"return":{
"status":"active",
"capabilities" : [ { "capability": "xbzrle", "state" : true } ],
"ram":{
"total":1057024,
"remaining":1053304,
"transferred":3720,
"total-time":12345,
"setup-time":12345,
"expected-downtime":12345,
"duplicate":10,
"normal":3333,
"normal-bytes":3412992,
"dirty-sync-count":15
},
"xbzrle-cache":{
"cache-size":67108864,
"bytes":20971520,
"pages":2444343,
"cache-miss":2244,
"cache-miss-rate":0.123,
"overflow":34434
}
}
}
EQMP
{
.name = "query-migrate",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_migrate,
},
SQMP
migrate-set-capabilities
------------------------
Enable/Disable migration capabilities
- "xbzrle": XBZRLE support
- "rdma-pin-all": pin all pages when using RDMA during migration
- "auto-converge": throttle down guest to help convergence of migration
- "zero-blocks": compress zero blocks during block migration
Arguments:
Example:
-> { "execute": "migrate-set-capabilities" , "arguments":
{ "capabilities": [ { "capability": "xbzrle", "state": true } ] } }
EQMP
{
.name = "migrate-set-capabilities",
.args_type = "capabilities:q",
.params = "capability:s,state:b",
.mhandler.cmd_new = qmp_marshal_input_migrate_set_capabilities,
},
SQMP
query-migrate-capabilities
--------------------------
Query current migration capabilities
- "capabilities": migration capabilities state
- "xbzrle" : XBZRLE state (json-bool)
- "rdma-pin-all" : RDMA Pin Page state (json-bool)
- "auto-converge" : Auto Converge state (json-bool)
- "zero-blocks" : Zero Blocks state (json-bool)
Arguments:
Example:
-> { "execute": "query-migrate-capabilities" }
<- { "return": [ { "state": false, "capability": "xbzrle" } ] }
EQMP
{
.name = "query-migrate-capabilities",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_migrate_capabilities,
},
SQMP
migrate-set-parameters
----------------------
Set migration parameters
- "compress-level": set compression level during migration (json-int)
- "compress-threads": set compression thread count for migration (json-int)
- "decompress-threads": set decompression thread count for migration (json-int)
Arguments:
Example:
-> { "execute": "migrate-set-parameters" , "arguments":
{ "compress-level": 1 } }
EQMP
{
.name = "migrate-set-parameters",
.args_type =
"compress-level:i?,compress-threads:i?,decompress-threads:i?",
.mhandler.cmd_new = qmp_marshal_input_migrate_set_parameters,
},
SQMP
query-migrate-parameters
------------------------
Query current migration parameters
- "parameters": migration parameters value
- "compress-level" : compression level value (json-int)
- "compress-threads" : compression thread count value (json-int)
- "decompress-threads" : decompression thread count value (json-int)
Arguments:
Example:
-> { "execute": "query-migrate-parameters" }
<- {
"return": {
"decompress-threads", 2,
"compress-threads", 8,
"compress-level", 1
}
}
EQMP
{
.name = "query-migrate-parameters",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_migrate_parameters,
},
SQMP
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)
Example:
-> { "execute": "query-balloon" }
<- {
"return":{
"actual":1073741824,
}
}
EQMP
{
.name = "query-balloon",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_balloon,
},
{
.name = "query-block-jobs",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_block_jobs,
},
{
.name = "qom-list",
.args_type = "path:s",
.mhandler.cmd_new = qmp_marshal_input_qom_list,
},
{
.name = "qom-set",
.args_type = "path:s,property:s,value:q",
.mhandler.cmd_new = qmp_qom_set,
},
{
.name = "qom-get",
.args_type = "path:s,property:s",
.mhandler.cmd_new = qmp_qom_get,
},
{
.name = "nbd-server-start",
.args_type = "addr:q",
.mhandler.cmd_new = qmp_marshal_input_nbd_server_start,
},
{
.name = "nbd-server-add",
.args_type = "device:B,writable:b?",
.mhandler.cmd_new = qmp_marshal_input_nbd_server_add,
},
{
.name = "nbd-server-stop",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_nbd_server_stop,
},
{
.name = "change-vnc-password",
.args_type = "password:s",
.mhandler.cmd_new = qmp_marshal_input_change_vnc_password,
},
{
.name = "qom-list-types",
.args_type = "implements:s?,abstract:b?",
.mhandler.cmd_new = qmp_marshal_input_qom_list_types,
},
{
.name = "device-list-properties",
.args_type = "typename:s",
.mhandler.cmd_new = qmp_marshal_input_device_list_properties,
},
{
.name = "query-machines",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_machines,
},
{
.name = "query-cpu-definitions",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_cpu_definitions,
},
{
.name = "query-target",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_target,
},
{
.name = "query-tpm",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_tpm,
},
SQMP
query-tpm
---------
Return information about the TPM device.
Arguments: None
Example:
-> { "execute": "query-tpm" }
<- { "return":
[
{ "model": "tpm-tis",
"options":
{ "type": "passthrough",
"data":
{ "cancel-path": "/sys/class/misc/tpm0/device/cancel",
"path": "/dev/tpm0"
}
},
"id": "tpm0"
}
]
}
EQMP
{
.name = "query-tpm-models",