On Wed, Jun 12, 2024 at 10:07 AM Daniel P. Berrangé <berra...@redhat.com> wrote:
>
> On Wed, Jun 12, 2024 at 09:59:25AM -0400, Stephen Gallagher wrote:
> > On Wed, Jun 12, 2024 at 9:55 AM Daniel P. Berrangé <berra...@redhat.com> 
> > 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 
> > > > <berra...@redhat.com> 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?
>
> Not trivial as a bunch of code executes from ELF constructors before
> main() starts.
>

Wrapper application that just does feature tests and then
fork/exec()'s the real application?
--
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