Re: [PATCH v3 29/30] vl: QAPIfy -object

This switches the system emulator from a QemuOpts-based parser for -object to user_creatable_parse_str() which uses a keyval parser and enforces the QAPI schema. Apart from being a cleanup, this makes non-scalar properties accessible. This adopts a similar model as -blockdev uses: When parsing the option, create the ObjectOptions and queue them. At the later point where we used to create objects for the collected QemuOpts, the ObjectOptions queue is processed instead. A complication compared to -blockdev is that object definitions are supported in -readconfig and -writeconfig. After this patch, -readconfig still works, though it still goes through the QemuOpts parser, which means that improvements like non-scalar properties are still not available in config files. -writeconfig stops working for -object. Tough luck. It has never supported all options (not even the common ones), so supporting one less isn't the end of the world. As object definitions from -readconfig still go through QemuOpts, they are still included in -writeconfig output, which at least prevents destroying your existing configuration when you just wanted to add another option.

Signed-off-by: Kevin Wolf <kwolf(a)redhat.com&gt; Acked-by: Peter Krempa <pkrempa(a)redhat.com&gt; Reviewed-by: Eric Blake <eblake(a)redhat.com&gt;