Re: [PATCH RFC] migration: warn about non-migratable configurations unless '--no-migration' was specified

[Eduardo Habkost]

On Sun, Apr 18, 2021 at 11:54 AM Peter Maydell <peter.maydell@linaro.org> wrote:
>
> On Thu, 15 Apr 2021 at 16:46, Vitaly Kuznetsov <vkuznets@redhat.com> wrote:
> > When a migration blocker is added nothing is reported to the user,
> > inability to migrate such guest may come as a late surprise. As a bare
> > minimum, we can print a warning. To not pollute the output for those, who
> > have no intention to migrate their guests, introduce '--no-migration'
> > option which both block the migration and eliminates warning from
>
> I'm not a fan. For a lot of people and configurations this
> is going to be "add an extra complaint from QEMU to a previously
> working configuration". We add too many of those already.

I agree that warning with machine types that never supported live
migration would be useless noise, but warning if using an explicit
versioned machine type sounds like a reasonable default (as long as
the warnings includes clear instructions on how to silence them).

--
Eduardo