block/cow: Avoid use of uninitialized cow_bs in error path

[mirror_qemu.git] / docs / qmp / qmp-events.txt

                   QEMU Machine Protocol Events
                   ============================

ACPI_DEVICE_OST
---------------

Emitted when guest executes ACPI _OST method.

 - data: ACPIOSTInfo type as described in qapi-schema.json

{ "event": "ACPI_DEVICE_OST",
     "data": { "device": "d1", "slot": "0", "slot-type": "DIMM", "source": 1, "status": 0 } }

BALLOON_CHANGE
--------------

Emitted when the guest changes the actual BALLOON level. This
value is equivalent to the 'actual' field return by the
'query-balloon' command

Data:

- "actual": actual level of the guest memory balloon in bytes (json-number)

Example:

{ "event": "BALLOON_CHANGE",
    "data": { "actual": 944766976 },
    "timestamp": { "seconds": 1267020223, "microseconds": 435656 } }

BLOCK_IMAGE_CORRUPTED
---------------------

Emitted when a disk image is being marked corrupt.

Data:

- "device": Device name (json-string)
- "msg":    Informative message (e.g., reason for the corruption) (json-string)
- "offset": If the corruption resulted from an image access, this is the access
            offset into the image (json-int)
- "size":   If the corruption resulted from an image access, this is the access
            size (json-int)

Example:

{ "event": "BLOCK_IMAGE_CORRUPTED",
    "data": { "device": "ide0-hd0",
        "msg": "Prevented active L1 table overwrite", "offset": 196608,
        "size": 65536 },
    "timestamp": { "seconds": 1378126126, "microseconds": 966463 } }

BLOCK_IO_ERROR
--------------

Emitted when a disk I/O error occurs.

Data:

- "device": device name (json-string)
- "operation": I/O operation (json-string, "read" or "write")
- "action": action that has been taken, it's one of the following (json-string):
    "ignore": error has been ignored
    "report": error has been reported to the device
    "stop": the VM is going to stop because of the error

Example:

{ "event": "BLOCK_IO_ERROR",
    "data": { "device": "ide0-hd1",
              "operation": "write",
              "action": "stop" },
    "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }

Note: If action is "stop", a STOP event will eventually follow the
BLOCK_IO_ERROR event.

BLOCK_JOB_CANCELLED
-------------------

Emitted when a block job has been cancelled.

Data:

- "type":     Job type (json-string; "stream" for image streaming
                                     "commit" for block commit)
- "device":   Device name (json-string)
- "len":      Maximum progress value (json-int)
- "offset":   Current progress value (json-int)
              On success this is equal to len.
              On failure this is less than len.
- "speed":    Rate limit, bytes per second (json-int)

Example:

{ "event": "BLOCK_JOB_CANCELLED",
     "data": { "type": "stream", "device": "virtio-disk0",
               "len": 10737418240, "offset": 134217728,
               "speed": 0 },
     "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }

BLOCK_JOB_COMPLETED
-------------------

Emitted when a block job has completed.

Data:

- "type":     Job type (json-string; "stream" for image streaming
                                     "commit" for block commit)
- "device":   Device name (json-string)
- "len":      Maximum progress value (json-int)
- "offset":   Current progress value (json-int)
              On success this is equal to len.
              On failure this is less than len.
- "speed":    Rate limit, bytes per second (json-int)
- "error":    Error message (json-string, optional)
              Only present on failure.  This field contains a human-readable
              error message.  There are no semantics other than that streaming
              has failed and clients should not try to interpret the error
              string.

Example:

{ "event": "BLOCK_JOB_COMPLETED",
     "data": { "type": "stream", "device": "virtio-disk0",
               "len": 10737418240, "offset": 10737418240,
               "speed": 0 },
     "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }

BLOCK_JOB_ERROR
---------------

Emitted when a block job encounters an error.

Data:

- "device": device name (json-string)
- "operation": I/O operation (json-string, "read" or "write")
- "action": action that has been taken, it's one of the following (json-string):
    "ignore": error has been ignored, the job may fail later
    "report": error will be reported and the job canceled
    "stop": error caused job to be paused

Example:

{ "event": "BLOCK_JOB_ERROR",
    "data": { "device": "ide0-hd1",
              "operation": "write",
              "action": "stop" },
    "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }

BLOCK_JOB_READY
---------------

Emitted when a block job is ready to complete.

Data:

- "type":     Job type (json-string; "stream" for image streaming
                                     "commit" for block commit)
- "device":   Device name (json-string)
- "len":      Maximum progress value (json-int)
- "offset":   Current progress value (json-int)
              On success this is equal to len.
              On failure this is less than len.
- "speed":    Rate limit, bytes per second (json-int)

Example:

{ "event": "BLOCK_JOB_READY",
    "data": { "device": "drive0", "type": "mirror", "speed": 0,
              "len": 2097152, "offset": 2097152 }
    "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }

Note: The "ready to complete" status is always reset by a BLOCK_JOB_ERROR
event.

DEVICE_DELETED
--------------

Emitted whenever the device removal completion is acknowledged
by the guest.
At this point, it's safe to reuse the specified device ID.
Device removal can be initiated by the guest or by HMP/QMP commands.

Data:

- "device": device name (json-string, optional)
- "path": device path (json-string)

{ "event": "DEVICE_DELETED",
  "data": { "device": "virtio-net-pci-0",
            "path": "/machine/peripheral/virtio-net-pci-0" },
  "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }

DEVICE_TRAY_MOVED
-----------------

It's emitted whenever the tray of a removable device is moved by the guest
or by HMP/QMP commands.

Data:

- "device": device name (json-string)
- "tray-open": true if the tray has been opened or false if it has been closed
               (json-bool)

{ "event": "DEVICE_TRAY_MOVED",
  "data": { "device": "ide1-cd0",
            "tray-open": true
  },
  "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }

GUEST_PANICKED
--------------

Emitted when guest OS panic is detected.

Data:

- "action": Action that has been taken (json-string, currently always "pause").

Example:

{ "event": "GUEST_PANICKED",
     "data": { "action": "pause" } }

NIC_RX_FILTER_CHANGED
---------------------

The event is emitted once until the query command is executed,
the first event will always be emitted.

Data:

- "name": net client name (json-string)
- "path": device path (json-string)

{ "event": "NIC_RX_FILTER_CHANGED",
  "data": { "name": "vnet0",
            "path": "/machine/peripheral/vnet0/virtio-backend" },
  "timestamp": { "seconds": 1368697518, "microseconds": 326866 } }
}

QUORUM_FAILURE
--------------

Emitted by the Quorum block driver if it fails to establish a quorum.

Data:

- "reference":    device name if defined else node name.
- "sector-num":   Number of the first sector of the failed read operation.
- "sector-count": Failed read operation sector count.

Example:

{ "event": "QUORUM_FAILURE",
     "data": { "reference": "usr1", "sector-num": 345435, "sector-count": 5 },
     "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }

QUORUM_REPORT_BAD
-----------------

Emitted to report a corruption of a Quorum file.

Data:

- "error":        Error message (json-string, optional)
                  Only present on failure.  This field contains a human-readable
                  error message.  There are no semantics other than that the
                  block layer reported an error and clients should not try to
                  interpret the error string.
- "node-name":    The graph node name of the block driver state.
- "sector-num":   Number of the first sector of the failed read operation.
- "sector-count": Failed read operation sector count.

Example:

{ "event": "QUORUM_REPORT_BAD",
     "data": { "node-name": "1.raw", "sector-num": 345435, "sector-count": 5 },
     "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }

RESET
-----

Emitted when the Virtual Machine is reseted.

Data: None.

Example:

{ "event": "RESET",
    "timestamp": { "seconds": 1267041653, "microseconds": 9518 } }

RESUME
------

Emitted when the Virtual Machine resumes execution.

Data: None.

Example:

{ "event": "RESUME",
    "timestamp": { "seconds": 1271770767, "microseconds": 582542 } }

RTC_CHANGE
----------

Emitted when the guest changes the RTC time.

Data:

- "offset": Offset between base RTC clock (as specified by -rtc base), and
new RTC clock value (json-number)

Example:

{ "event": "RTC_CHANGE",
    "data": { "offset": 78 },
    "timestamp": { "seconds": 1267020223, "microseconds": 435656 } }

SHUTDOWN
--------

Emitted when the Virtual Machine is powered down.

Data: None.

Example:

{ "event": "SHUTDOWN",
    "timestamp": { "seconds": 1267040730, "microseconds": 682951 } }

Note: If the command-line option "-no-shutdown" has been specified, a STOP
event will eventually follow the SHUTDOWN event.

SPICE_CONNECTED, SPICE_DISCONNECTED
-----------------------------------

Emitted when a SPICE client connects or disconnects.

Data:

- "server": Server information (json-object)
  - "host": IP address (json-string)
  - "port": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")
- "client": Client information (json-object)
  - "host": IP address (json-string)
  - "port": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")

Example:

{ "timestamp": {"seconds": 1290688046, "microseconds": 388707},
  "event": "SPICE_CONNECTED",
  "data": {
    "server": { "port": "5920", "family": "ipv4", "host": "127.0.0.1"},
    "client": {"port": "52873", "family": "ipv4", "host": "127.0.0.1"}
}}

SPICE_INITIALIZED
-----------------

Emitted after initial handshake and authentication takes place (if any)
and the SPICE channel is up'n'running

Data:

- "server": Server information (json-object)
  - "host": IP address (json-string)
  - "port": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")
  - "auth": authentication method (json-string, optional)
- "client": Client information (json-object)
  - "host": IP address (json-string)
  - "port": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")
  - "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": whevener the channel is encrypted (json-bool)

Example:

{ "timestamp": {"seconds": 1290688046, "microseconds": 417172},
  "event": "SPICE_INITIALIZED",
  "data": {"server": {"auth": "spice", "port": "5921",
                      "family": "ipv4", "host": "127.0.0.1"},
           "client": {"port": "49004", "family": "ipv4", "channel-type": 3,
                      "connection-id": 1804289383, "host": "127.0.0.1",
                      "channel-id": 0, "tls": true}
}}

STOP
----

Emitted when the Virtual Machine is stopped.

Data: None.

Example:

{ "event": "STOP",
    "timestamp": { "seconds": 1267041730, "microseconds": 281295 } }

SUSPEND
-------

Emitted when guest enters S3 state.

Data: None.

Example:

{ "event": "SUSPEND",
     "timestamp": { "seconds": 1344456160, "microseconds": 309119 } }

SUSPEND_DISK
------------

Emitted when the guest makes a request to enter S4 state.

Data: None.

Example:

{ "event": "SUSPEND_DISK",
     "timestamp": { "seconds": 1344456160, "microseconds": 309119 } }

Note: QEMU shuts down when entering S4 state.

VNC_CONNECTED
-------------

Emitted when a VNC client establishes a connection.

Data:

- "server": Server information (json-object)
  - "host": IP address (json-string)
  - "service": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")
  - "auth": authentication method (json-string, optional)
- "client": Client information (json-object)
  - "host": IP address (json-string)
  - "service": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")

Example:

{ "event": "VNC_CONNECTED",
    "data": {
        "server": { "auth": "sasl", "family": "ipv4",
                    "service": "5901", "host": "0.0.0.0" },
        "client": { "family": "ipv4", "service": "58425",
                    "host": "127.0.0.1" } },
    "timestamp": { "seconds": 1262976601, "microseconds": 975795 } }


Note: This event is emitted before any authentication takes place, thus
the authentication ID is not provided.

VNC_DISCONNECTED
----------------

Emitted when the connection is closed.

Data:

- "server": Server information (json-object)
  - "host": IP address (json-string)
  - "service": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")
  - "auth": authentication method (json-string, optional)
- "client": Client information (json-object)
  - "host": IP address (json-string)
  - "service": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")
  - "x509_dname": TLS dname (json-string, optional)
  - "sasl_username": SASL username (json-string, optional)

Example:

{ "event": "VNC_DISCONNECTED",
    "data": {
        "server": { "auth": "sasl", "family": "ipv4",
                    "service": "5901", "host": "0.0.0.0" },
        "client": { "family": "ipv4", "service": "58425",
                    "host": "127.0.0.1", "sasl_username": "luiz" } },
    "timestamp": { "seconds": 1262976601, "microseconds": 975795 } }

VNC_INITIALIZED
---------------

Emitted after authentication takes place (if any) and the VNC session is
made active.

Data:

- "server": Server information (json-object)
  - "host": IP address (json-string)
  - "service": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")
  - "auth": authentication method (json-string, optional)
- "client": Client information (json-object)
  - "host": IP address (json-string)
  - "service": port number (json-string)
  - "family": address family (json-string, "ipv4" or "ipv6")
  - "x509_dname": TLS dname (json-string, optional)
  - "sasl_username": SASL username (json-string, optional)

Example:

{ "event": "VNC_INITIALIZED",
    "data": {
        "server": { "auth": "sasl", "family": "ipv4",
                    "service": "5901", "host": "0.0.0.0"},
        "client": { "family": "ipv4", "service": "46089",
                    "host": "127.0.0.1", "sasl_username": "luiz" } },
        "timestamp": { "seconds": 1263475302, "microseconds": 150772 } }

WAKEUP
------

Emitted when the guest has woken up from S3 and is running.

Data: None.

Example:

{ "event": "WAKEUP",
     "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }

WATCHDOG
--------

Emitted when the watchdog device's timer is expired.

Data:

- "action": Action that has been taken, it's one of the following (json-string):
            "reset", "shutdown", "poweroff", "pause", "debug", or "none"

Example:

{ "event": "WATCHDOG",
     "data": { "action": "reset" },
     "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }

Note: If action is "reset", "shutdown", or "pause" the WATCHDOG event is
followed respectively by the RESET, SHUTDOWN, or STOP events.