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[quanxian <quanxian.wang@xxxxxxxxx>]

** Changed in: intel
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1786139

Title:
  [GLK/CLX] Enhanced IBRS

Status in intel:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Won't Fix
Status in linux source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux source package in Cosmic:
  Fix Released
Status in linux source package in Disco:
  Fix Released

Bug description:
  Description:

  [Impact]

  Future Intel CPU's like Cascade Lake and GLK+ support Enhanced IBRS.
  Enhanced IBRS is a H/W mitigation technique for Spectre V2 bug. So,
  it's important for us to make sure that all the OSV's are using this
  feature.

  The patch that enables kernel support for this feature has been taken
  by Thomas and it's in TIP tree. So, please back port it to all the
  OSV's. Please find the patch here:
  https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/pti&id=706d51681d636a0c4a5ef53395ec3b803e45ed4d

  [Test Case]

  For processors that don't support Enhanced IBRS, the test is to ensure
  that /sys/devices/system/cpu/vulnerabilities/spectre_v2 doesn't change
  state after applying the patches. This will typically be the string
  when running on Intel processors that don't support Enhanced IBRS:

    "Mitigation: Full generic retpoline, IBPB, IBRS_FW"

  New Intel processors that do support Enhanced IBRS will display
  "Enhanced IBRS" in place of "Full generic retpoline"

  [Regression Potential]

  Pretty low. The patches are fairly simple and they should only affect
  new processors. The main concern is around the possibility of
  regressing IBRS support on processors that don't support Enhanced IBRS

  Target Kernel:TBD
  Target Release: 19.04

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