Re: [PATCH v10 2/5] xen: change VIRQ_CONSOLE to VIRQ_DOMAIN to allow non-hwdom binding

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Mon, 9 Feb 2026, Jan Beulich wrote:
> On 05.02.2026 00:37, Stefano Stabellini wrote:
> > Today only hwdom can bind VIRQ_CONSOLE. This patch changes the virq from
> > global to VIRQ_DOMAIN to allow other domains to bind to it.
> > 
> > Note that Linux silently falls back to polling when binding fails, which
> > masks the issue.
> > 
> > Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
> > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
> 
> Technically this is an ABI change, and hence I'm uncertain it can go without
> that aspect being at least mentioned, perhaps even its implications properly
> discussed.

I am not sure if it qualifies as an ABI change or not but I am happy to
expand the commit message in any way you might suggest.

The jist of it is already in the commit message, really the key element
is that VIRQ_CONSOLE can be bound by multiple domains.

Aside from spelling out "this is an ABI change" what do you have in
mind?