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=============
D-Bus VMState
=============
The QEMU dbus-vmstate object's aim is to migrate helpers' data running
on a QEMU D-Bus bus. (refer to the :doc:`dbus` document for
some recommendations on D-Bus usage)
Upon migration, QEMU will go through the queue of
``org.qemu.VMState1`` D-Bus name owners and query their ``Id``. It
must be unique among the helpers.
It will then save arbitrary data of each Id to be transferred in the
migration stream and restored/loaded at the corresponding destination
helper.
For now, the data amount to be transferred is arbitrarily limited to
1Mb. The state must be saved quickly (a fraction of a second). (D-Bus
imposes a time limit on reply anyway, and migration would fail if data
isn't given quickly enough.)
dbus-vmstate object can be configured with the expected list of
helpers by setting its ``id-list`` property, with a comma-separated
``Id`` list.
.. only:: sphinx4
.. dbus-doc:: backends/dbus-vmstate1.xml
.. only:: not sphinx4
.. warning::
Sphinx 4 is required to build D-Bus documentation.
This is the content of ``backends/dbus-vmstate1.xml``:
.. literalinclude:: ../../backends/dbus-vmstate1.xml
:language: xml
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