Re: [RFC PATCH 00/10] hw/misc/vmcoreinfo: Convert from QDev to plain Object

[Ani Sinha]

On Thu, 19 Dec, 2024, 9:27 pm Daniel P. Berrangé, <berrange@redhat.com> wrote:

On Thu, Dec 19, 2024 at 04:38:47PM +0100, Philippe Mathieu-Daudé wrote:
> No reason for vmcoreinfo to be based on QDev, since it
> doesn't use any QDev API. Demote to plain Object.

I'm not especially convinced by that rationale, at least in the short
term[1].

As a user of QEMU, I would tend to view -device  as being the way to
create devices that are visible to the guest, and -object as being
for dealing with host backends.

vmcoreinfo is quite an unusal device, in that if only exists as a
fwcfg field, but that's an internal impl detail from a user's POV,
and it is still a guest visible device type.

So while it may not leverage QDev API, I still feel it is more of
a fit for -device, than -object. 

+1 to this.

Is there any functional benefit
to moving it to -object, that outweighs the disruption ?