On 9/12/19 7:25 AM, Marc-André Lureau wrote: > When instanciated, this object will connect to the given D-Bus
instantiated > bus. During migration, it will take the data from org.qemu.VMState1 > instances. > > See documentation for further details. > > Signed-off-by: Marc-André Lureau <marcandre.lur...@redhat.com> > --- > +++ b/docs/interop/dbus-vmstate.rst > @@ -0,0 +1,68 @@ > +============= > +D-Bus VMState > +============= > + > +Introduction > +============ > + > +The QEMU dbus-vmstate object aim is to migrate helpers data running on > +a QEMU D-Bus bus. (refer to the :doc:`dbus` document for > +recommendation on D-Bus usage) object's aim is to migrate helpers' data > + > +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. > + > +The data amount to be transferred is limited to 1Mb. The state must be > +saved quickly (a few seconds maximum). (D-Bus imposes a time limit on > +reply anyway, and migration would fail if data isn't given quickly > +enough) s/enough)/enough.)/ > + > +dbus-vmstate object can be configured with the expected list of > +helpers by setting its ``id-list`` property, with a coma-separated comma -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
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