[RFC PATCH 0/9] Machine check handling in linux host.

[Mahesh J Salgaonkar]

Hi,

Please find the patch set that performs the machine check handling inside linux
host. The design is to be able to handle re-entrancy so that we do not clobber
the machine check information during nested machine check interrupt.

The patch 2 implements the logic to save the raw MCE info onto the emergency
stack and prepares to take another exception. Patch 3 and 4 adds CPU-side hooks
for early machine check handler and TLB flush.  The patch 5 and 6 is
responsible to detect SLB/TLB errors and flush them off in the real mode. The
patch 7 implements the logic to decode and save high level MCE information to
per cpu buffer without clobbering. The patch 9 adds the basic error handling to
the high level C code with MMU on.

I have tested SLB multihit scenario on powernv. For TLB multihit and nested
machine check testing, I am still working on getting cronus setup to be able
to inject errors.

Please review and let me know your comments.

Thanks,
-Mahesh.

---

Mahesh Salgaonkar (9):
      powerpc: Split the common exception prolog logic into two section.
      powerpc: handle machine check in Linux host.
      powerpc: Introduce a early machine check hook in cpu_spec.
      powerpc: Add flush_tlb operation in cpu_spec.
      powerpc: Flush SLB/TLBs if we get SLB/TLB machine check errors on power7.
      powerpc: Flush SLB/TLBs if we get SLB/TLB machine check errors on power8.
      powerpc: Decode and save machine check event.
      powerpc/powernv: Remove machine check handling in OPAL.
      powerpc/powernv: Machine check exception handling.


 arch/powerpc/include/asm/bitops.h        |    5 +
 arch/powerpc/include/asm/cputable.h      |   12 +
 arch/powerpc/include/asm/exception-64s.h |  110 ++++++++---
 arch/powerpc/include/asm/mce.h           |  190 ++++++++++++++++++++
 arch/powerpc/kernel/Makefile             |    3 
 arch/powerpc/kernel/cpu_setup_power.S    |   39 +++-
 arch/powerpc/kernel/cputable.c           |   16 ++
 arch/powerpc/kernel/exceptions-64s.S     |   50 +++++
 arch/powerpc/kernel/mce.c                |  179 +++++++++++++++++++
 arch/powerpc/kernel/mce_power.c          |  287 ++++++++++++++++++++++++++++++
 arch/powerpc/kernel/traps.c              |   15 ++
 arch/powerpc/kvm/book3s_hv_ras.c         |   42 +---
 arch/powerpc/platforms/powernv/opal.c    |   84 ++++++---
 13 files changed, 935 insertions(+), 97 deletions(-)
 create mode 100644 arch/powerpc/include/asm/mce.h
 create mode 100644 arch/powerpc/kernel/mce.c
 create mode 100644 arch/powerpc/kernel/mce_power.c

-- 
-Mahesh