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[stable][oslo] Supporting qemu 4.1.0 on stein and older


On Mon, Oct 14, 2019 at 10:52:56AM -0500, Ben Nemec wrote:
> Okay, circling back to wrap this topic up. It sounds like this is a pretty
> big win in terms of avoiding random failures either from trying to migrate a
> VM with nested guests on older qemu or using newer qemu with older
> OpenStack. Since it's a pretty simple patch and it allows our stable
> branches to behave more sanely, I'm inclined to go with the backport. If
> anyone strongly objects, please let me know ASAP before we release it.

It's a little strange but from a stable POV it's okay to backport.  We
had to do something similar after meltdown, as kernel fixes for that
introduced 'anti-features we needed to account for that clearly didn't
exist when we built the older releases of OpenStack.

Yours Tony.
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