Re: [PATCH 0/8] qom: pass TargetInfo to the is_available callback

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Oct 07, 2026 at 01:25:46PM -0700, Pierrick Bouvier wrote:
> On 10/7/2026 4:47 AM, Yonggang Luo wrote:
> > This allows a combined binary to register machine types from all its targets.
> > Consequently, QMP `query-machines` can return machine entries from every
> > target, even when `none` is selected. For example, a client can query the
> > combined machine list with:
> > 
> > ```json
> > { "execute": "query-machines" }
> > ```
> > 
> > The returned list includes the registered machine classes from all linked
> > targets. This is separate from selecting a machine: with `-target none`,
> > `-M virt` reports the targets that provide `virt` instead of choosing one
> > arbitrarily:
> > 
> > ```text
> > qemu-system -target none -M virt
> > unsupported machine type: "virt" for target "none"
> > Available for targets:
> >   aarch64
> >   arm
> > ```
> >
> 
> From the long conversation on a previous thread, I thought we reached
> the conclusion that if we didn't expose any ambiguous name, then -target
> option is unnecessary, or maybe I got lost on track of this thread.
> 
> https://lore.kernel.org/qemu-devel/ar_coT44h5-zJPVV@redhat.com/
> 
> I'm not sure which semantic we want to have with -target none. If there
> is no ambiguous name registered, we just don't need it at all. It's a
> win-win IMHO.

Yes, if we expose unique names for every machine, then -target is then
redundant.

With regards,
Daniel
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