[libvirt] [PATCH 7/8] qemu: Implement the HTM pSeries feature

[Andrea Bolognani]

On Fri, 2018-03-16 at 11:33 -0400, John Ferlan wrote:
> This looks particularly useful for other commands, but...
> 
[...]
> 
> It's only generated/built for one - seems like a lot of work for little
> gain unless of course there's a plan to add in all the others.  Without
> adding in others, one is left to wonder the "best" way to add things in
> the future.

The RFC versions of the series added three more features, which made
very good use of the generic code introduced here. I've later decided
to skip those features, at least initially, because QEMU added
mitigated machine type variants that cover 99% of what people need.
I'm still unconvinced there is a need to have more fine-grained knobs
there, so those three features are probably not going to be
introduced any time soon.

Moreover, between the time I posted this series and today, I've
learned that work on a POWER9-compatible version of HTM is
progressing much faster than initially anticipated, so this last
feature too might end up being unnecessary in the medium run. I'm
still not sure about this last part, but there is enough uncertainty
there that I would probably not push this before 4.2.0 is out even
if it were fully R-b'd.

Finally, it was always my intention, assuming the approach taken here
had been considered good, to convert existing features to use it: I
guess at this point the tables have turned and I should *start* with
that instead :)

-- 
Andrea Bolognani / Red Hat / Virtualization