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[Launchpad Bug Tracker <1621042@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package qemu - 1:2.5+dfsg-5ubuntu10.5

---------------
qemu (1:2.5+dfsg-5ubuntu10.5) xenial; urgency=medium

  * fix default machine types. (LP: #1621042)
    - add dep3 header to d/p/ubuntu/define-ubuntu-machine-types.patch
    - remove double default and double ubuntu alias
    - add xenial machine type
    - add q35 based ubuntu machine type
    - add ubuntu machine types on ppc64el and s390x

 -- Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx>  Tue, 20 Sep
2016 09:38:03 +0200

** Changed in: qemu (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1621042

Title:
  qemu machine types broken in wily and missed to be updated in xenial
  and yakkety

Status in qemu package in Ubuntu:
  Fix Released
Status in qemu source package in Xenial:
  Fix Released

Bug description:
  [Impact]

   * Without proper default types migration to further releases can hardly be maintained for Ubuntu
   * Avoiding several weird cases that were caused by the double default and double alias to different machine types

  [Test Case]

   * spawn a kvm guest and check its (default) type - should be Ubuntu specific
   * migrate that guest to a subsequent Ubuntu release

   * Detailed tests are available at https://code.launchpad.net/~ubuntu-
  server/ubuntu/+source/qemu-migration-test/+git/qemu-migration-test

  [Regression Potential]

   * There could be combinations of qemu releases that won't be able to
  migrate between each other. We tested the supported forward to next
  release migration. But we also tested the migration between systems
  with and without the SRU in case customers apply the change at
  different times.

   * Testing was done as outlined in the bug in detail. There are issues
  left regarding migration, but we fixed several old ones and didn't
  open up a new one with that SRU contribution. See the logs in the bug
  for details. Comment #7 has a summary.

  [Other Info]

   * There is a lot of general background info on the topic available at
  https://wiki.ubuntu.com/QemuKVMMigration

  ---

  The machine type definition in Wily still refers to compat 2.3 despite
  being a 2.4 qemu.

  Also there was no update at all for Xenial and Yakkety, which is why
  they start by default with this broken type pc-i440fx-wily.

  Ubuntu delta to machine types has to be updated in devel release and
  SRUed into Xenial at least.

  Impact: lack of machine features and broken migration from the failing
  releases.

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