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