If you think I should rebase on mainine, I will do so with the changes
you suggested above.
Well I'll be guided by what Richard thinks about the chances of this
merging ahead of the main MTTCG patches. You were mentioning the trouble
with testing with the kvm-unit-tests based tests which all need MTTCG
system mode to trigger problems. However user mode emulation "works" now
(even better since Peter's signal fixes) so it might be worth
investigating if we can leverage some user-mode testing instead.
Also generally keeping patch series clean and self contained stops too
large a pile of patches getting pilled up waiting for the controversial
bits to get reviewed and merged.