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https://gitlab.com/qemu-project/qemu
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![Markus Armbruster](/assets/img/avatar_default.png)
Since commit a937b6aa73
(qapi: Reformat doc comments to conform to
current conventions), a number of comments not conforming to the
current formatting conventions were added. No problem, just sweep
the entire documentation once more.
To check the generated documentation does not change, I compared the
generated HTML before and after this commit with "wdiff -3". Finds no
differences. Comparing with diff is not useful, as the reflown
paragraphs are visible there.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20230720071610.1096458-7-armbru@redhat.com>
596 lines
17 KiB
Python
596 lines
17 KiB
Python
# -*- Mode: Python -*-
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# vim: filetype=python
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##
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# = Block devices
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##
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{ 'include': 'block-core.json' }
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##
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# == Additional block stuff (VM related)
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##
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##
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# @BiosAtaTranslation:
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#
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# Policy that BIOS should use to interpret cylinder/head/sector
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# addresses. Note that Bochs BIOS and SeaBIOS will not actually
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# translate logical CHS to physical; instead, they will use logical
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# block addressing.
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#
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# @auto: If cylinder/heads/sizes are passed, choose between none and
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# LBA depending on the size of the disk. If they are not passed,
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# choose none if QEMU can guess that the disk had 16 or fewer
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# heads, large if QEMU can guess that the disk had 131072 or fewer
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# tracks across all heads (i.e. cylinders*heads<131072), otherwise
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# LBA.
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#
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# @none: The physical disk geometry is equal to the logical geometry.
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#
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# @lba: Assume 63 sectors per track and one of 16, 32, 64, 128 or 255
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# heads (if fewer than 255 are enough to cover the whole disk with
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# 1024 cylinders/head). The number of cylinders/head is then
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# computed based on the number of sectors and heads.
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#
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# @large: The number of cylinders per head is scaled down to 1024 by
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# correspondingly scaling up the number of heads.
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#
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# @rechs: Same as @large, but first convert a 16-head geometry to
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# 15-head, by proportionally scaling up the number of
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# cylinders/head.
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#
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# Since: 2.0
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##
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{ 'enum': 'BiosAtaTranslation',
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'data': ['auto', 'none', 'lba', 'large', 'rechs']}
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##
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# @FloppyDriveType:
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#
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# Type of Floppy drive to be emulated by the Floppy Disk Controller.
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#
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# @144: 1.44MB 3.5" drive
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#
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# @288: 2.88MB 3.5" drive
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#
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# @120: 1.2MB 5.25" drive
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#
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# @none: No drive connected
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#
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# @auto: Automatically determined by inserted media at boot
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#
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# Since: 2.6
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##
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{ 'enum': 'FloppyDriveType',
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'data': ['144', '288', '120', 'none', 'auto']}
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##
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# @PRManagerInfo:
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#
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# Information about a persistent reservation manager
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#
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# @id: the identifier of the persistent reservation manager
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#
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# @connected: true if the persistent reservation manager is connected
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# to the underlying storage or helper
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#
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# Since: 3.0
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##
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{ 'struct': 'PRManagerInfo',
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'data': {'id': 'str', 'connected': 'bool'} }
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##
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# @query-pr-managers:
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#
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# Returns a list of information about each persistent reservation
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# manager.
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#
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# Returns: a list of @PRManagerInfo for each persistent reservation
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# manager
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#
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# Since: 3.0
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##
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{ 'command': 'query-pr-managers', 'returns': ['PRManagerInfo'],
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'allow-preconfig': true }
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##
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# @eject:
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#
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# Ejects the medium from a removable drive.
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#
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# @device: Block device name
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#
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# @id: The name or QOM path of the guest device (since: 2.8)
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#
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# @force: If true, eject regardless of whether the drive is locked.
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# If not specified, the default value is false.
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#
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# Features:
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#
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# @deprecated: Member @device is deprecated. Use @id instead.
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#
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# Returns:
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# - Nothing on success
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# - If @device is not a valid block device, DeviceNotFound
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#
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# Notes: Ejecting a device with no media results in success
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#
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# Since: 0.14
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#
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# Example:
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#
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# -> { "execute": "eject", "arguments": { "id": "ide1-0-1" } }
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# <- { "return": {} }
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##
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{ 'command': 'eject',
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'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] },
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'*id': 'str',
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'*force': 'bool' } }
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##
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# @blockdev-open-tray:
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#
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# Opens a block device's tray. If there is a block driver state tree
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# inserted as a medium, it will become inaccessible to the guest (but
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# it will remain associated to the block device, so closing the tray
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# will make it accessible again).
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#
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# If the tray was already open before, this will be a no-op.
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#
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# Once the tray opens, a DEVICE_TRAY_MOVED event is emitted. There
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# are cases in which no such event will be generated, these include:
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#
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# - if the guest has locked the tray, @force is false and the guest
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# does not respond to the eject request
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# - if the BlockBackend denoted by @device does not have a guest
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# device attached to it
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# - if the guest device does not have an actual tray
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#
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# @device: Block device name
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#
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# @id: The name or QOM path of the guest device (since: 2.8)
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#
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# @force: if false (the default), an eject request will be sent to the
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# guest if it has locked the tray (and the tray will not be opened
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# immediately); if true, the tray will be opened regardless of
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# whether it is locked
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#
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# Features:
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#
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# @deprecated: Member @device is deprecated. Use @id instead.
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#
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# Since: 2.5
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#
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# Example:
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#
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# -> { "execute": "blockdev-open-tray",
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# "arguments": { "id": "ide0-1-0" } }
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#
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# <- { "timestamp": { "seconds": 1418751016,
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# "microseconds": 716996 },
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# "event": "DEVICE_TRAY_MOVED",
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# "data": { "device": "ide1-cd0",
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# "id": "ide0-1-0",
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# "tray-open": true } }
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#
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# <- { "return": {} }
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##
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{ 'command': 'blockdev-open-tray',
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'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] },
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'*id': 'str',
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'*force': 'bool' } }
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##
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# @blockdev-close-tray:
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#
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# Closes a block device's tray. If there is a block driver state tree
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# associated with the block device (which is currently ejected), that
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# tree will be loaded as the medium.
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#
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# If the tray was already closed before, this will be a no-op.
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#
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# @device: Block device name
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#
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# @id: The name or QOM path of the guest device (since: 2.8)
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#
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# Features:
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#
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# @deprecated: Member @device is deprecated. Use @id instead.
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#
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# Since: 2.5
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#
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# Example:
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#
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# -> { "execute": "blockdev-close-tray",
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# "arguments": { "id": "ide0-1-0" } }
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#
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# <- { "timestamp": { "seconds": 1418751345,
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# "microseconds": 272147 },
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# "event": "DEVICE_TRAY_MOVED",
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# "data": { "device": "ide1-cd0",
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# "id": "ide0-1-0",
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# "tray-open": false } }
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#
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# <- { "return": {} }
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##
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{ 'command': 'blockdev-close-tray',
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'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] },
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'*id': 'str' } }
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##
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# @blockdev-remove-medium:
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#
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# Removes a medium (a block driver state tree) from a block device.
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# That block device's tray must currently be open (unless there is no
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# attached guest device).
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#
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# If the tray is open and there is no medium inserted, this will be a
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# no-op.
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#
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# @id: The name or QOM path of the guest device
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#
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# Since: 2.12
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#
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# Example:
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#
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# -> { "execute": "blockdev-remove-medium",
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# "arguments": { "id": "ide0-1-0" } }
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#
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# <- { "error": { "class": "GenericError",
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# "desc": "Tray of device 'ide0-1-0' is not open" } }
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#
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# -> { "execute": "blockdev-open-tray",
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# "arguments": { "id": "ide0-1-0" } }
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#
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# <- { "timestamp": { "seconds": 1418751627,
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# "microseconds": 549958 },
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# "event": "DEVICE_TRAY_MOVED",
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# "data": { "device": "ide1-cd0",
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# "id": "ide0-1-0",
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# "tray-open": true } }
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#
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# <- { "return": {} }
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#
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# -> { "execute": "blockdev-remove-medium",
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# "arguments": { "id": "ide0-1-0" } }
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#
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# <- { "return": {} }
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##
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{ 'command': 'blockdev-remove-medium',
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'data': { 'id': 'str' } }
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##
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# @blockdev-insert-medium:
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#
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# Inserts a medium (a block driver state tree) into a block device.
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# That block device's tray must currently be open (unless there is no
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# attached guest device) and there must be no medium inserted already.
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#
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# @id: The name or QOM path of the guest device
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#
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# @node-name: name of a node in the block driver state graph
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#
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# Since: 2.12
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#
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# Example:
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#
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# -> { "execute": "blockdev-add",
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# "arguments": {
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# "node-name": "node0",
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# "driver": "raw",
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# "file": { "driver": "file",
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# "filename": "fedora.iso" } } }
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# <- { "return": {} }
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#
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# -> { "execute": "blockdev-insert-medium",
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# "arguments": { "id": "ide0-1-0",
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# "node-name": "node0" } }
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#
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# <- { "return": {} }
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##
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{ 'command': 'blockdev-insert-medium',
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'data': { 'id': 'str',
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'node-name': 'str'} }
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##
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# @BlockdevChangeReadOnlyMode:
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#
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# Specifies the new read-only mode of a block device subject to the
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# @blockdev-change-medium command.
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#
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# @retain: Retains the current read-only mode
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#
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# @read-only: Makes the device read-only
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#
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# @read-write: Makes the device writable
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#
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# Since: 2.3
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##
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{ 'enum': 'BlockdevChangeReadOnlyMode',
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'data': ['retain', 'read-only', 'read-write'] }
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##
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# @blockdev-change-medium:
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#
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# Changes the medium inserted into a block device by ejecting the
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# current medium and loading a new image file which is inserted as the
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# new medium (this command combines blockdev-open-tray,
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# blockdev-remove-medium, blockdev-insert-medium and
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# blockdev-close-tray).
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#
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# @device: Block device name
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#
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# @id: The name or QOM path of the guest device (since: 2.8)
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#
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# @filename: filename of the new image to be loaded
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#
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# @format: format to open the new image with (defaults to the probed
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# format)
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#
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# @read-only-mode: change the read-only mode of the device; defaults
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# to 'retain'
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#
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# @force: if false (the default), an eject request through
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# blockdev-open-tray will be sent to the guest if it has locked
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# the tray (and the tray will not be opened immediately); if true,
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# the tray will be opened regardless of whether it is locked.
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# (since 7.1)
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#
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# Features:
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#
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# @deprecated: Member @device is deprecated. Use @id instead.
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#
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# Since: 2.5
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#
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# Examples:
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#
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# 1. Change a removable medium
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#
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# -> { "execute": "blockdev-change-medium",
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# "arguments": { "id": "ide0-1-0",
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# "filename": "/srv/images/Fedora-12-x86_64-DVD.iso",
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# "format": "raw" } }
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# <- { "return": {} }
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#
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# 2. Load a read-only medium into a writable drive
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#
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# -> { "execute": "blockdev-change-medium",
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# "arguments": { "id": "floppyA",
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# "filename": "/srv/images/ro.img",
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# "format": "raw",
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# "read-only-mode": "retain" } }
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#
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# <- { "error":
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# { "class": "GenericError",
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# "desc": "Could not open '/srv/images/ro.img': Permission denied" } }
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#
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# -> { "execute": "blockdev-change-medium",
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# "arguments": { "id": "floppyA",
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# "filename": "/srv/images/ro.img",
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# "format": "raw",
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# "read-only-mode": "read-only" } }
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#
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# <- { "return": {} }
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##
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{ 'command': 'blockdev-change-medium',
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'data': { '*device': { 'type': 'str', 'features': [ 'deprecated' ] },
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'*id': 'str',
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'filename': 'str',
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'*format': 'str',
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'*force': 'bool',
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'*read-only-mode': 'BlockdevChangeReadOnlyMode' } }
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##
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# @DEVICE_TRAY_MOVED:
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#
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# Emitted whenever the tray of a removable device is moved by the
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# guest or by HMP/QMP commands
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#
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# @device: Block device name. This is always present for
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# compatibility reasons, but it can be empty ("") if the image
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# does not have a device name associated.
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#
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# @id: The name or QOM path of the guest device (since 2.8)
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#
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# @tray-open: true if the tray has been opened or false if it has been
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# closed
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#
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# Since: 1.1
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#
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# Example:
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#
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# <- { "event": "DEVICE_TRAY_MOVED",
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# "data": { "device": "ide1-cd0",
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# "id": "/machine/unattached/device[22]",
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# "tray-open": true
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# },
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# "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
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##
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{ 'event': 'DEVICE_TRAY_MOVED',
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'data': { 'device': 'str', 'id': 'str', 'tray-open': 'bool' } }
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##
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# @PR_MANAGER_STATUS_CHANGED:
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#
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# Emitted whenever the connected status of a persistent reservation
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# manager changes.
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#
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# @id: The id of the PR manager object
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#
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# @connected: true if the PR manager is connected to a backend
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#
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# Since: 3.0
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#
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# Example:
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#
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# <- { "event": "PR_MANAGER_STATUS_CHANGED",
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# "data": { "id": "pr-helper0",
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# "connected": true
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# },
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# "timestamp": { "seconds": 1519840375, "microseconds": 450486 } }
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##
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{ 'event': 'PR_MANAGER_STATUS_CHANGED',
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'data': { 'id': 'str', 'connected': 'bool' } }
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##
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# @block_set_io_throttle:
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#
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# Change I/O throttle limits for a block drive.
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#
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# Since QEMU 2.4, each device with I/O limits is member of a throttle
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# group.
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#
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# If two or more devices are members of the same group, the limits
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# will apply to the combined I/O of the whole group in a round-robin
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# fashion. Therefore, setting new I/O limits to a device will affect
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# the whole group.
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#
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# The name of the group can be specified using the 'group' parameter.
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# If the parameter is unset, it is assumed to be the current group of
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# that device. If it's not in any group yet, the name of the device
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# will be used as the name for its group.
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#
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# The 'group' parameter can also be used to move a device to a
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# different group. In this case the limits specified in the
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# parameters will be applied to the new group only.
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#
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# I/O limits can be disabled by setting all of them to 0. In this case
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# the device will be removed from its group and the rest of its
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# members will not be affected. The 'group' parameter is ignored.
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#
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# Returns:
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# - Nothing on success
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# - If @device is not a valid block device, DeviceNotFound
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#
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# Since: 1.1
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#
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# Examples:
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#
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# -> { "execute": "block_set_io_throttle",
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# "arguments": { "id": "virtio-blk-pci0/virtio-backend",
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# "bps": 0,
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# "bps_rd": 0,
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# "bps_wr": 0,
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# "iops": 512,
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# "iops_rd": 0,
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# "iops_wr": 0,
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# "bps_max": 0,
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# "bps_rd_max": 0,
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# "bps_wr_max": 0,
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# "iops_max": 0,
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# "iops_rd_max": 0,
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# "iops_wr_max": 0,
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# "bps_max_length": 0,
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# "iops_size": 0 } }
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# <- { "return": {} }
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#
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# -> { "execute": "block_set_io_throttle",
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# "arguments": { "id": "ide0-1-0",
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# "bps": 1000000,
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# "bps_rd": 0,
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# "bps_wr": 0,
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# "iops": 0,
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# "iops_rd": 0,
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# "iops_wr": 0,
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# "bps_max": 8000000,
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# "bps_rd_max": 0,
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# "bps_wr_max": 0,
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# "iops_max": 0,
|
|
# "iops_rd_max": 0,
|
|
# "iops_wr_max": 0,
|
|
# "bps_max_length": 60,
|
|
# "iops_size": 0 } }
|
|
# <- { "return": {} }
|
|
##
|
|
{ 'command': 'block_set_io_throttle', 'boxed': true,
|
|
'data': 'BlockIOThrottle',
|
|
'allow-preconfig': true }
|
|
|
|
##
|
|
# @block-latency-histogram-set:
|
|
#
|
|
# Manage read, write and flush latency histograms for the device.
|
|
#
|
|
# If only @id parameter is specified, remove all present latency
|
|
# histograms for the device. Otherwise, add/reset some of (or all)
|
|
# latency histograms.
|
|
#
|
|
# @id: The name or QOM path of the guest device.
|
|
#
|
|
# @boundaries: list of interval boundary values (see description in
|
|
# BlockLatencyHistogramInfo definition). If specified, all latency
|
|
# histograms are removed, and empty ones created for all io types
|
|
# with intervals corresponding to @boundaries (except for io
|
|
# types, for which specific boundaries are set through the
|
|
# following parameters).
|
|
#
|
|
# @boundaries-read: list of interval boundary values for read latency
|
|
# histogram. If specified, old read latency histogram is removed,
|
|
# and empty one created with intervals corresponding to
|
|
# @boundaries-read. The parameter has higher priority then
|
|
# @boundaries.
|
|
#
|
|
# @boundaries-write: list of interval boundary values for write
|
|
# latency histogram.
|
|
#
|
|
# @boundaries-zap: list of interval boundary values for zone append
|
|
# write latency histogram.
|
|
#
|
|
# @boundaries-flush: list of interval boundary values for flush
|
|
# latency histogram.
|
|
#
|
|
# Returns: error if device is not found or any boundary arrays are
|
|
# invalid.
|
|
#
|
|
# Since: 4.0
|
|
#
|
|
# Example:
|
|
#
|
|
# Set new histograms for all io types with intervals [0, 10), [10,
|
|
# 50), [50, 100), [100, +inf):
|
|
#
|
|
# -> { "execute": "block-latency-histogram-set",
|
|
# "arguments": { "id": "drive0",
|
|
# "boundaries": [10, 50, 100] } }
|
|
# <- { "return": {} }
|
|
#
|
|
# Example:
|
|
#
|
|
# Set new histogram only for write, other histograms will remain not
|
|
# changed (or not created):
|
|
#
|
|
# -> { "execute": "block-latency-histogram-set",
|
|
# "arguments": { "id": "drive0",
|
|
# "boundaries-write": [10, 50, 100] } }
|
|
# <- { "return": {} }
|
|
#
|
|
# Example:
|
|
#
|
|
# Set new histograms with the following intervals: read, flush: [0,
|
|
# 10), [10, 50), [50, 100), [100, +inf) write: [0, 1000), [1000,
|
|
# 5000), [5000, +inf)
|
|
#
|
|
# -> { "execute": "block-latency-histogram-set",
|
|
# "arguments": { "id": "drive0",
|
|
# "boundaries": [10, 50, 100],
|
|
# "boundaries-write": [1000, 5000] } }
|
|
# <- { "return": {} }
|
|
#
|
|
# Example:
|
|
#
|
|
# Remove all latency histograms:
|
|
#
|
|
# -> { "execute": "block-latency-histogram-set",
|
|
# "arguments": { "id": "drive0" } }
|
|
# <- { "return": {} }
|
|
##
|
|
{ 'command': 'block-latency-histogram-set',
|
|
'data': {'id': 'str',
|
|
'*boundaries': ['uint64'],
|
|
'*boundaries-read': ['uint64'],
|
|
'*boundaries-write': ['uint64'],
|
|
'*boundaries-zap': ['uint64'],
|
|
'*boundaries-flush': ['uint64'] },
|
|
'allow-preconfig': true }
|