Re: Guidance on individual packages requiring x86_64-v2 baseline ?

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On Wed, Jun 12, 2024 at 9:55 AM Daniel P. Berrangé <berrange@xxxxxxxxxx> wrote:
>
> On Wed, Jun 12, 2024 at 09:51:34AM -0400, Stephen Gallagher wrote:
> > On Wed, Jun 12, 2024 at 8:41 AM Daniel P. Berrangé <berrange@xxxxxxxxxx> wrote:
> > > IOW, if [when] we rebase Fedora to the next QEMU upstream release, users
> > > with older x86_64 hardware would likely be unable to run QEMU, from F41
> > > onwards, unless some TBD action is taken.
> > >
> > > Thus I'm wondering whether Fedora has any policy or guidance on handling
> > > such a situation both in general, and more specifically for "critical path"
> > > packages, if that difference is relevant ? The packaging guidelines aren't
> > > especially explicit about this situation, unless I've missed something
> > > beyond the "compiler flags" and "architecture support" sections.
> > >
> >
> > Absent a project-wide decision to move to the newer baseline, I think
> > the best approach we can take would be to find some way to communicate
> > to the user that the software isn't usable. In the case of Qemu, does
> > the application report an error or crash if it's run on hardware
> > without the requisite baseline?
>
> I've not tested, but I would expect it to crash attempting to execute an
> illegal instruction
>

OK, that's a situation that will lead to annoying and unresolvable bug
reports. Would it be possible to put something in place that would
check processor capabilities early in execution before hitting any of
the affected instructions?
--
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