[Bug 1744882] Re: Add SPEC_CTRL and IBRS changes

[Corey Bryant]

Regression testing with tempest successful on ocata-proposed:

======
Totals
======
Ran: 102 tests in 1543.5582 sec.
 - Passed: 94
 - Skipped: 8
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 0
Sum of execute time for each test: 908.5919 sec.

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https://bugs.launchpad.net/bugs/1744882

Title:
  Add SPEC_CTRL and IBRS changes

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive icehouse series:
  New
Status in Ubuntu Cloud Archive kilo series:
  Fix Committed
Status in Ubuntu Cloud Archive mitaka series:
  New
Status in Ubuntu Cloud Archive ocata series:
  Fix Committed
Status in Ubuntu Cloud Archive pike series:
  Fix Committed
Status in qemu package in Ubuntu:
  Triaged
Status in qemu source package in Trusty:
  Fix Released
Status in qemu source package in Xenial:
  Fix Released
Status in qemu source package in Artful:
  Fix Released
Status in qemu source package in Bionic:
  Triaged

Bug description:
  The merge of [1] landed the spectre related changes for SPEC_CTRL and
  IBRS to qemu 2.12

  It is announced in [2] that there shall be a 2.11.1 with the backport that we intend to pick.
  The security team can use this merge at [1] to work on backwards security updates.
  For 18.04 (not yet released) the intention for now is to pick 2.11.1 once available.

  [1]: https://github.com/qemu/qemu/commit/5cad8ca516011695a37d5be905292722b5249da8
  [2]: https://www.qemu.org/2018/01/04/spectre/

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