[Bug 1454743] [NEW] Explicitly disable the VSX instruction for ppc64el

[Mathieu Trudel-Lapierre]

Public bug reported:

[Impact]
POWER7/POWER8 systems which have the VSX bit enabled by default may find themselves crashing with 'instruction exception' errors when booting.

[Test case]
- Install grub
- Boot the system

[Regression Potential]
VSX being disabled means another piece of software down the stack needs to re-enable it when necessary. This should be done by the kernel.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: grub2 (Ubuntu Trusty)
     Importance: High
         Status: In Progress

** Also affects: grub2 (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: grub2 (Ubuntu Trusty)
       Status: New => In Progress

** Changed in: grub2 (Ubuntu Trusty)
   Importance: Undecided => High

** Changed in: grub2 (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1454743

Title:
  Explicitly disable the VSX instruction for ppc64el

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Trusty:
  In Progress

Bug description:
  [Impact]
  POWER7/POWER8 systems which have the VSX bit enabled by default may find themselves crashing with 'instruction exception' errors when booting.

  [Test case]
  - Install grub
  - Boot the system

  [Regression Potential]
  VSX being disabled means another piece of software down the stack needs to re-enable it when necessary. This should be done by the kernel.

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