On Tue, 11 Jun 2024 at 06:50, Markus Armbruster <arm...@redhat.com> wrote: > > Philippe Mathieu-Daudé <phi...@linaro.org> writes: > > > Officialise the QMP command, use the existing > > hmp_info_human_readable_text() helper. > > I'm not sure "officialise" is a word :) > > Taking a step back... "info via" and its new QMP counterpart > x-query-mos6522-devices dump device state. I understand why examining > device state via monitor can be useful for debugging. However, we have > more than 2000 devices in the tree. Clearly, we don't want 2000 device > state queries. Not even 100. Could we have more generic means instead? > > We could use QOM (read-only) properties to expose device state. > > If we use one QOM property per "thing", examining device state becomes > quite tedious. Also, you'd have to stop the guest to get a consistent > view, and adding lots of QOM properties bloats the code. > > If we use a single, object-valued property for the entire state, we get > to define the objects in QAPI. Differently tedious, and bloats the > generated code.
We already have a machine readable mandatory-for-every-device representation of its entire state -- it's the vmstate struct. Admittedly this is sometimes a bit different from the guest-facing view of a device and we don't machine-record the field names... -- PMM
