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https://gitlab.com/qemu-project/qemu
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64b4529a43
The -device JSON syntax impl leaks a reference on the created
DeviceState instance. As a result when you hot-unplug the
device, the device_finalize method won't be called and thus
it will fail to emit the required DEVICE_DELETED event.
A 'json-cli' feature was previously added against the
'device_add' QMP command QAPI schema to indicated to mgmt
apps that -device supported JSON syntax. Given the hotplug
bug that feature flag is not usable for its purpose, so
we add a new 'json-cli-hotplug' feature to indicate the
-device supports JSON without breaking hotplug.
Fixes: 5dacda5167
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/802
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220105123847.4047954-2-berrange@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Tested-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
161 lines
4.5 KiB
Python
161 lines
4.5 KiB
Python
# -*- Mode: Python -*-
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# vim: filetype=python
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#
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# This work is licensed under the terms of the GNU GPL, version 2 or later.
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# See the COPYING file in the top-level directory.
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##
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# = Device infrastructure (qdev)
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##
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{ 'include': 'qom.json' }
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##
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# @device-list-properties:
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#
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# List properties associated with a device.
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#
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# @typename: the type name of a device
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#
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# Returns: a list of ObjectPropertyInfo describing a devices properties
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#
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# Note: objects can create properties at runtime, for example to describe
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# links between different devices and/or objects. These properties
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# are not included in the output of this command.
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#
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# Since: 1.2
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##
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{ 'command': 'device-list-properties',
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'data': { 'typename': 'str'},
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'returns': [ 'ObjectPropertyInfo' ] }
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##
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# @device_add:
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#
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# Add a device.
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#
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# @driver: the name of the new device's driver
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#
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# @bus: the device's parent bus (device tree path)
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#
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# @id: the device's ID, must be unique
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#
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# Features:
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# @json-cli: If present, the "-device" command line option supports JSON
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# syntax with a structure identical to the arguments of this
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# command.
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# @json-cli-hotplug: If present, the "-device" command line option supports JSON
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# syntax without the reference counting leak that broke
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# hot-unplug
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#
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# Notes:
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#
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# Additional arguments depend on the type.
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#
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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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#
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# 2. It's possible to list device properties by running QEMU with the
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# "-device DEVICE,help" command-line argument, where DEVICE is the
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# device's name
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#
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# Example:
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#
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# -> { "execute": "device_add",
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# "arguments": { "driver": "e1000", "id": "net1",
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# "bus": "pci.0",
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# "mac": "52:54:00:12:34:56" } }
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# <- { "return": {} }
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#
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# TODO: This command effectively bypasses QAPI completely due to its
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# "additional arguments" business. It shouldn't have been added to
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# the schema in this form. It should be qapified properly, or
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# replaced by a properly qapified command.
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#
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# Since: 0.13
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##
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{ 'command': 'device_add',
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'data': {'driver': 'str', '*bus': 'str', '*id': 'str'},
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'gen': false, # so we can get the additional arguments
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'features': ['json-cli', 'json-cli-hotplug'] }
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##
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# @device_del:
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#
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# Remove a device from a guest
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#
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# @id: the device's ID or QOM path
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#
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# Returns: Nothing on success
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# If @id is not a valid device, DeviceNotFound
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#
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# Notes: When this command completes, the device may not be removed from the
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# guest. Hot removal is an operation that requires guest cooperation.
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# This command merely requests that the guest begin the hot removal
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# process. Completion of the device removal process is signaled with a
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# DEVICE_DELETED event. Guest reset will automatically complete removal
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# for all devices. If a guest-side error in the hot removal process is
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# detected, the device will not be removed and a DEVICE_UNPLUG_GUEST_ERROR
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# event is sent. Some errors cannot be detected.
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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": "device_del",
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# "arguments": { "id": "net1" } }
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# <- { "return": {} }
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#
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# -> { "execute": "device_del",
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# "arguments": { "id": "/machine/peripheral-anon/device[0]" } }
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# <- { "return": {} }
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#
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##
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{ 'command': 'device_del', 'data': {'id': 'str'} }
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##
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# @DEVICE_DELETED:
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#
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# Emitted whenever the device removal completion is acknowledged by the guest.
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# At this point, it's safe to reuse the specified device ID. Device removal can
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# be initiated by the guest or by HMP/QMP commands.
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#
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# @device: the device's ID if it has one
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#
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# @path: the device's QOM path
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#
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# Since: 1.5
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#
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# Example:
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#
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# <- { "event": "DEVICE_DELETED",
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# "data": { "device": "virtio-net-pci-0",
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# "path": "/machine/peripheral/virtio-net-pci-0" },
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# "timestamp": { "seconds": 1265044230, "microseconds": 450486 } }
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#
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##
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{ 'event': 'DEVICE_DELETED',
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'data': { '*device': 'str', 'path': 'str' } }
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##
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# @DEVICE_UNPLUG_GUEST_ERROR:
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#
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# Emitted when a device hot unplug fails due to a guest reported error.
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#
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# @device: the device's ID if it has one
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#
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# @path: the device's QOM path
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#
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# Since: 6.2
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#
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# Example:
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#
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# <- { "event": "DEVICE_UNPLUG_GUEST_ERROR"
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# "data": { "device": "core1",
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# "path": "/machine/peripheral/core1" },
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# },
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# "timestamp": { "seconds": 1615570772, "microseconds": 202844 } }
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#
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##
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{ 'event': 'DEVICE_UNPLUG_GUEST_ERROR',
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'data': { '*device': 'str', 'path': 'str' } }
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