Daniel P. Berrangé wrote:
> It isn't as simple as changing the CFLAGS. QEMU used to check for
> the CPU feature at startup, set a flag, and then later use that flag
> to choose different codepaths, but this logic was removed. Avoiding
> the flag check in hot-paths makes a perf difference.
> 
> So we would have to revert the whole patch series in Fedora. That's
> doable today, but I'm not confident carrying a local only revert over
> time.

But it is the ONLY approach that is compatible with Fedora policies, and as 
such should be required. ESPECIALLY for a package like QEMU that many people 
are using.

If forward-porting the reverts stops being doable, then we will have to keep 
the old version of QEMU or fork the project.

        Kevin Kofler
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