This bug was fixed in the package qemu - 1:2.11+dfsg-1ubuntu2

---------------
qemu (1:2.11+dfsg-1ubuntu2) bionic; urgency=medium

  * d/p/ubuntu/qemu-stable-2.11.1.patch: add stable release
    - among other fixes this adds code to:
      - mitigate the Spectre/Meltdown attacks (LP: #1744882) (CVE-2017-5715)
        However, enabling this functionality requires additional configuration
        beyond just updating QEMU. Also migrations need special consideration.
        Details about that can be found at:
        https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-update/
      - Power9 allocation of max 8 threads per core (LP: #1750526)
  * Drop changes that are part of the upstream stable release
    - d/p/ubuntu/linux-headers-update-to-4.15-rc1.patch
    - d/p/ubuntu/linux-headers-update-4.15-rc9.patch
    - d/p/ubuntu/lp1743560-s390x-kvm-Handle-bpb-feature.patch
    - d/p/ubuntu/lp1743560-s390x-kvm-provide-stfle.81.patch
  * d/p/ubuntu/define-ubuntu-machine-types.patch: refresh to match stable update
  * d/p/ubuntu/pre-bionic-256k-ipxe-efi-roms.patch: unify to only change the
    common compat.h header and add some extra info in the patch header.

 -- Christian Ehrhardt <christian.ehrha...@canonical.com>  Mon, 19 Feb
2018 11:03:11 +0100

** Changed in: qemu (Ubuntu Bionic)
       Status: Triaged => Fix Released

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

Title:
  Add SPEC_CTRL and IBRS changes

Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive kilo series:
  Fix Committed
Status in Ubuntu Cloud Archive mitaka series:
  Fix Committed
Status in Ubuntu Cloud Archive ocata series:
  Fix Committed
Status in Ubuntu Cloud Archive pike series:
  Fix Released
Status in qemu package in Ubuntu:
  Fix Released
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:
  Fix Released

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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