If it works on 15.04, but not 14.04, it's by accident.  As in, the
installer isn't making this work, it's systemd that's spawning a console
anyway.  Your XML file shows the same non-standard console setup that we
previously complained about with kimchi.  Maybe this is a libvirt issue
that it's picking bizarre port addresses for the serial, but we
definitely need to relax how we look at those.

However, the initial bug report was for installing via VGA (so, no text
console) and then rebooting.  Fixing that case in trusty is a bit
tougher, but we might be able to just detect the machine type and decide
those should always have an hvc0 regardless, or similar.  I'll think
about it.

The reason this always works with PowerVM is the combination of (a) all
installs are text-mode, so we can always look up the root console(s)
during install, and they'll always exist, and (b) PowerVM gives us a
consistent address for hvc0/hvc1 and we therefore detect them correctly
every time.  qemu/kvm allowing people to define these things willy-nilly
is marginally unhelpful.

Anyhow, the above paragraph isn't excuses, so much as an explanation for
why things work the way they do now.  We assumed the world of SLOF-
under-qemu would look just like OF-under-PowerVM (and, 99% of the time,
this assumption is true), and that is biting us a bit.  When I get back
from vacation later this week, I'll dream up some solid ways to deal
with the this new world order.

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https://bugs.launchpad.net/bugs/1391919

Title:
  ISST-KVM:Ubuntu14.04: guest console not accessible but ssh and ping
  works fine

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