[4.15 & 4.14 stable 00/12] Series to update microcode loading.

[Ashok Raj]

Hi Greg

Here is a series that addresses microcode loading stability issues post
Spectre. All of them are simply cherry-picked and the patches themselves
have the upstream commit ID's. 

I checked this for Intel platforms and thanks to Boris for checking
on AMD platforms. 

I'm still working on a 4.9 backport, will send those once i get them to 
work. stop_machine differences seem big enough that i might choose a 
different approach for the 4.9 backport.

Cheers,
Ashok

Ashok Raj (4):
  x86/microcode/intel: Check microcode revision before updating sibling
    threads
  x86/microcode/intel: Writeback and invalidate caches before updating
    microcode
  x86/microcode: Do not upload microcode if CPUs are offline
  x86/microcode: Synchronize late microcode loading

Borislav Petkov (8):
  x86/microcode: Propagate return value from updating functions
  x86/CPU: Add a microcode loader callback
  x86/CPU: Check CPU feature bits after microcode upgrade
  x86/microcode: Get rid of struct apply_microcode_ctx
  x86/microcode/intel: Look into the patch cache first
  x86/microcode: Request microcode on the BSP
  x86/microcode: Attempt late loading only when new microcode is present
  x86/microcode: Fix CPU synchronization routine

 arch/x86/include/asm/microcode.h      |  10 +-
 arch/x86/include/asm/processor.h      |   1 +
 arch/x86/kernel/cpu/common.c          |  30 ++++++
 arch/x86/kernel/cpu/microcode/amd.c   |  44 +++++----
 arch/x86/kernel/cpu/microcode/core.c  | 181 ++++++++++++++++++++++++++--------
 arch/x86/kernel/cpu/microcode/intel.c |  62 +++++++++---
 6 files changed, 252 insertions(+), 76 deletions(-)

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2.7.4