dd746afbb4
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
456 lines
13 KiB
Plaintext
456 lines
13 KiB
Plaintext
QMP Supported Commands
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----------------------
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This document describes all commands currently supported by QMP.
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Most of the time their usage is exactly the same as in the user Monitor, this
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means that any other document which also describe commands (the manpage,
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QEMU's manual, etc) can and should be consulted.
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QMP has two types of commands: regular and query commands. Regular commands
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usually change the Virtual Machine's state someway, while query commands just
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return information. The sections below are divided accordingly.
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It's important to observe that all communication examples are formatted in
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a reader-friendly way, so that they're easier to understand. However, in real
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protocol usage, they're emitted as a single line.
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Also, the following notation is used to denote data flow:
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-> data issued by the Client
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<- Server data response
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Please, refer to the QMP specification (docs/qmp-spec.txt) for detailed
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information on the Server command and response formats.
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NOTE: This document is temporary and will be replaced soon.
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1. Stability Considerations
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===========================
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The current QMP command set (described in this file) may be useful for a
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number of use cases, however it's limited and several commands have bad
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defined semantics, specially with regard to command completion.
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These problems are going to be solved incrementally in the next QEMU releases
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and we're going to establish a deprecation policy for badly defined commands.
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If you're planning to adopt QMP, please observe the following:
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1. The deprecation policy will take effect and be documented soon, please
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check the documentation of each used command as soon as a new release of
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QEMU is available
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2. DO NOT rely on anything which is not explicit documented
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3. Errors, in special, are not documented. Applications should NOT check
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for specific errors classes or data (it's strongly recommended to only
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check for the "error" key)
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2. Regular Commands
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===================
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Server's responses in the examples below are always a success response, please
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refer to the QMP specification for more details on error responses.
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device_add
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----------
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Add a device.
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Arguments:
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- "driver": the name of the new device's driver (json-string)
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- "bus": the device's parent bus (device tree path, json-string, optional)
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- "id": the device's ID, must be unique (json-string)
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- device properties
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Example:
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-> { "execute": "device_add", "arguments": { "driver": "e1000", "id": "net1" } }
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<- { "return": {} }
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Notes:
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(1) For detailed information about this command, please refer to the
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'docs/qdev-device-use.txt' file.
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(2) It's possible to list device properties by running QEMU with the
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"-device DEVICE,\?" command-line argument, where DEVICE is the device's name
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cpu
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---
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Set the default CPU.
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Arguments:
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- "index": the CPU's index (json-int)
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Example:
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-> { "execute": "cpu", "arguments": { "index": 0 } }
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<- { "return": {} }
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Note: CPUs' indexes are obtained with the 'query-cpus' command.
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xen-load-devices-state
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----------------------
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Load the state of all devices from file. The RAM and the block devices
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of the VM are not loaded by this command.
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Arguments:
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- "filename": the file to load the state of the devices from as binary
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data. See xen-save-devices-state.txt for a description of the binary
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format.
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Example:
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-> { "execute": "xen-load-devices-state",
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"arguments": { "filename": "/tmp/resume" } }
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<- { "return": {} }
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migrate-set-cache-size
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----------------------
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Set cache size to be used by XBZRLE migration, the cache size will be rounded
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down to the nearest power of 2
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Arguments:
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- "value": cache size in bytes (json-int)
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Example:
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-> { "execute": "migrate-set-cache-size", "arguments": { "value": 536870912 } }
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<- { "return": {} }
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x-colo-lost-heartbeat
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--------------------
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Tell COLO that heartbeat is lost, a failover or takeover is needed.
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Example:
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-> { "execute": "x-colo-lost-heartbeat" }
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<- { "return": {} }
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query-dump
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----------
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Query background dump status.
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Arguments: None.
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Example:
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-> { "execute": "query-dump" }
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<- { "return": { "status": "active", "completed": 1024000,
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"total": 2048000 } }
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blockdev-mirror
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------------
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Start mirroring a block device's writes to another block device. target
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specifies the target of mirror operation.
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Arguments:
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- "job-id": Identifier for the newly-created block job. If omitted,
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the device name will be used. (json-string, optional)
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- "device": The device name or node-name of a root node whose writes should be
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mirrored (json-string)
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- "target": device name to mirror to (json-string)
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- "replaces": the block driver node name to replace when finished
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(json-string, optional)
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- "speed": maximum speed of the streaming job, in bytes per second
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(json-int)
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- "granularity": granularity of the dirty bitmap, in bytes (json-int, optional)
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- "buf_size": maximum amount of data in flight from source to target, in bytes
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(json-int, default 10M)
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- "sync": what parts of the disk image should be copied to the destination;
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possibilities include "full" for all the disk, "top" for only the sectors
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allocated in the topmost image, or "none" to only replicate new I/O
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(MirrorSyncMode).
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- "on-source-error": the action to take on an error on the source
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(BlockdevOnError, default 'report')
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- "on-target-error": the action to take on an error on the target
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(BlockdevOnError, default 'report')
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The default value of the granularity is the image cluster size clamped
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between 4096 and 65536, if the image format defines one. If the format
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does not define a cluster size, the default value of the granularity
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is 65536.
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Example:
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-> { "execute": "blockdev-mirror", "arguments": { "device": "ide-hd0",
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"target": "target0",
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"sync": "full" } }
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<- { "return": {} }
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qmp_capabilities
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----------------
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Enable QMP capabilities.
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Arguments: None.
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Example:
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-> { "execute": "qmp_capabilities" }
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<- { "return": {} }
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Note: This command must be issued before issuing any other command.
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3. Query Commands
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=================
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query-commands
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--------------
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List QMP available commands.
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Each command is represented by a json-object, the returned value is a json-array
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of all commands.
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Each json-object contain:
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- "name": command's name (json-string)
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Example:
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-> { "execute": "query-commands" }
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<- {
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"return":[
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{
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"name":"query-balloon"
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},
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{
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"name":"system_powerdown"
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}
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]
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}
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Note: This example has been shortened as the real response is too long.
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query-qmp-schema
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----------------
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Return the QMP wire schema. The returned value is a json-array of
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named schema entities. Entities are commands, events and various
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types. See docs/qapi-code-gen.txt for information on their structure
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and intended use.
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x-blockdev-change
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-----------------
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Dynamically reconfigure the block driver state graph. It can be used
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to add, remove, insert or replace a graph node. Currently only the
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Quorum driver implements this feature to add or remove its child. This
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is useful to fix a broken quorum child.
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If @node is specified, it will be inserted under @parent. @child
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may not be specified in this case. If both @parent and @child are
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specified but @node is not, @child will be detached from @parent.
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Arguments:
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- "parent": the id or name of the parent node (json-string)
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- "child": the name of a child under the given parent node (json-string, optional)
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- "node": the name of the node that will be added (json-string, optional)
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Note: this command is experimental, and not a stable API. It doesn't
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support all kinds of operations, all kinds of children, nor all block
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drivers.
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Warning: The data in a new quorum child MUST be consistent with that of
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the rest of the array.
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Example:
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Add a new node to a quorum
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-> { "execute": "blockdev-add",
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"arguments": { "driver": "raw",
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"node-name": "new_node",
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"file": { "driver": "file",
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"filename": "test.raw" } } }
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<- { "return": {} }
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-> { "execute": "x-blockdev-change",
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"arguments": { "parent": "disk1",
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"node": "new_node" } }
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<- { "return": {} }
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Delete a quorum's node
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-> { "execute": "x-blockdev-change",
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"arguments": { "parent": "disk1",
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"child": "children.1" } }
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<- { "return": {} }
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trace-event-get-state
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---------------------
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Query the state of events.
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Arguments:
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- "name": Event name pattern (json-string).
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- "vcpu": The vCPU to query, any vCPU by default (json-int, optional).
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An event is returned if:
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- its name matches the "name" pattern, and
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- if "vcpu" is given, the event has the "vcpu" property.
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Therefore, if "vcpu" is given, the operation will only match per-vCPU events,
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returning their state on the specified vCPU. Special case: if "name" is an exact
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match, "vcpu" is given and the event does not have the "vcpu" property, an error
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is returned.
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Example:
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-> { "execute": "trace-event-get-state", "arguments": { "name": "qemu_memalign" } }
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<- { "return": [ { "name": "qemu_memalign", "state": "disabled" } ] }
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trace-event-set-state
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---------------------
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Set the state of events.
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Arguments:
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- "name": Event name pattern (json-string).
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- "enable": Whether to enable or disable the event (json-bool).
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- "ignore-unavailable": Whether to ignore errors for events that cannot be
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changed (json-bool, optional).
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- "vcpu": The vCPU to act upon, all vCPUs by default (json-int, optional).
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An event's state is modified if:
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- its name matches the "name" pattern, and
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- if "vcpu" is given, the event has the "vcpu" property.
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Therefore, if "vcpu" is given, the operation will only match per-vCPU events,
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setting their state on the specified vCPU. Special case: if "name" is an exact
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match, "vcpu" is given and the event does not have the "vcpu" property, an error
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is returned.
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Example:
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-> { "execute": "trace-event-set-state", "arguments": { "name": "qemu_memalign", "enable": "true" } }
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<- { "return": {} }
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Show rocker switch
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------------------
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Arguments:
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- "name": switch name
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Example:
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-> { "execute": "query-rocker", "arguments": { "name": "sw1" } }
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<- { "return": {"name": "sw1", "ports": 2, "id": 1327446905938}}
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Show rocker switch ports
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------------------------
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Arguments:
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- "name": switch name
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Example:
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-> { "execute": "query-rocker-ports", "arguments": { "name": "sw1" } }
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<- { "return": [ {"duplex": "full", "enabled": true, "name": "sw1.1",
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"autoneg": "off", "link-up": true, "speed": 10000},
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{"duplex": "full", "enabled": true, "name": "sw1.2",
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"autoneg": "off", "link-up": true, "speed": 10000}
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]}
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Show rocker switch OF-DPA flow tables
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-------------------------------------
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Arguments:
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- "name": switch name
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- "tbl-id": (optional) flow table ID
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Example:
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-> { "execute": "query-rocker-of-dpa-flows", "arguments": { "name": "sw1" } }
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<- { "return": [ {"key": {"in-pport": 0, "priority": 1, "tbl-id": 0},
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"hits": 138,
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"cookie": 0,
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"action": {"goto-tbl": 10},
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"mask": {"in-pport": 4294901760}
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},
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{...more...},
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]}
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Show rocker OF-DPA group tables
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-------------------------------
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Arguments:
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- "name": switch name
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- "type": (optional) group type
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Example:
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-> { "execute": "query-rocker-of-dpa-groups", "arguments": { "name": "sw1" } }
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<- { "return": [ {"type": 0, "out-pport": 2, "pport": 2, "vlan-id": 3841,
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"pop-vlan": 1, "id": 251723778},
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{"type": 0, "out-pport": 0, "pport": 0, "vlan-id": 3841,
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"pop-vlan": 1, "id": 251723776},
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{"type": 0, "out-pport": 1, "pport": 1, "vlan-id": 3840,
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"pop-vlan": 1, "id": 251658241},
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{"type": 0, "out-pport": 0, "pport": 0, "vlan-id": 3840,
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"pop-vlan": 1, "id": 251658240}
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]}
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query-gic-capabilities
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---------------
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Return a list of GICCapability objects, describing supported GIC
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(Generic Interrupt Controller) versions.
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Arguments: None
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Example:
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-> { "execute": "query-gic-capabilities" }
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<- { "return": [{ "version": 2, "emulated": true, "kernel": false },
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{ "version": 3, "emulated": false, "kernel": true } ] }
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Show existing/possible CPUs
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---------------------------
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Arguments: None.
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Example for pseries machine type started with
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-smp 2,cores=2,maxcpus=4 -cpu POWER8:
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-> { "execute": "query-hotpluggable-cpus" }
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<- {"return": [
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{ "props": { "core-id": 8 }, "type": "POWER8-spapr-cpu-core",
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"vcpus-count": 1 },
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{ "props": { "core-id": 0 }, "type": "POWER8-spapr-cpu-core",
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"vcpus-count": 1, "qom-path": "/machine/unattached/device[0]"}
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]}'
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Example for pc machine type started with
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-smp 1,maxcpus=2:
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-> { "execute": "query-hotpluggable-cpus" }
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<- {"return": [
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{
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"type": "qemu64-x86_64-cpu", "vcpus-count": 1,
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"props": {"core-id": 0, "socket-id": 1, "thread-id": 0}
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},
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{
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"qom-path": "/machine/unattached/device[0]",
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"type": "qemu64-x86_64-cpu", "vcpus-count": 1,
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"props": {"core-id": 0, "socket-id": 0, "thread-id": 0}
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}
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]}
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