[v2 0/3] Patches to address some limitations in OS microcode loading.

[Ashok Raj <ashok.raj@intel.com>]

Patch series to address limitations of OS microcode loading.

Review comments from Boris:

Changes since v1: Patch 1/3
- Check for revision to avoid duplicate microcode load in early load
- Added inline comments.

Changes since v1: Patch 2/3
- Change to native_wbinvd for early load.

Changes since v1: Patch 3/3
- Check for return code of stop_machine
- When microcode file load fails, stop on first error.
- If any of the present CPUs are offline, then stop reload.
  This is just for being paranoid. 
- Added more comments in commit log and inline in file.
- split some functionality from reload_store() per Boris's comments.

What's not done from review: TBD:
- Load microcode file only once. Added comments in source for future cleanup.
- Removing ucd->errors. (Gives a count of failed loads)


Ashok Raj (3):
  x86/microcode/intel: Check microcode revision before updating sibling
    threads
  x86/microcode/intel: Perform a cache flush before ucode update.
  x86/microcode: Quiesce all threads before a microcode update.

 arch/x86/kernel/cpu/microcode/core.c  | 207 ++++++++++++++++++++++++++++++----
 arch/x86/kernel/cpu/microcode/intel.c |  43 ++++++-
 2 files changed, 222 insertions(+), 28 deletions(-)

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2.7.4