Re: [Qemu-devel] qgraph

[Paolo Bonzini]

On 11/06/19 10:56, Markus Armbruster wrote:
> Yes, this is how introspection (both QMP and QOM) is commonly used.
> Just keep in mind one difference: QMP is static, QOM is dynamic.
> 
> QMP being static means it's defined at compile time.  So is the value of
> query-qmp-schema.  Same QEMU build, same value.  This permits caching.
> 
> QOM being dynamic means to introspect an object's properties, you have
> to create it.  Worse, an object's properties may (in theory) change at
> any time.  *Properties*, not just property *values*.  In practice, I'd
> expect properties to change only at realize time.

Right, and we should move more towards class-based properties so that
the dynamic nature of QOM is only used for the bare minimum needed (e.g.
memory regions).

Paolo