Re: [Qemu-devel] [PATCH v3 6/6] Add dbus-vmstate object

[Eric Blake <eblake@redhat.com>]

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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.lureau@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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