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 introduces separate emergency stack in paca structure exclusively
for machine check exception handling. Patch 3 implements the logic to save the
raw MCE info onto the emergency stack and prepares to take another exception.
Patch 4 and 5 adds CPU-side hooks for early machine check handler and TLB
flush. The patch 6 and 7 is responsible to detect SLB/TLB errors and flush
them off in the real mode. The patch 9 implements the logic to decode and save
high level MCE information to per cpu buffer without clobbering. The patch 10
adds the basic error handling to the high level C code with MMU on.
I have tested SLB multihit scenario on powernv.
Please review and let me know your comments.
Changes in v2:
- Moved early machine check handling code under CPU_FTR_HVMODE section.
This makes sure that the early machine check handler will get executed
only in hypervisor kernel.
- Add dedicated emergency stack for machine check so that we don't end up
disturbing others who use same emergency stack.
- Fixed the machine check early handle where it used to assume that r1 always
contains the valid stack pointer.
- Fixed an issue where per-cpu mce_nest_count variable underflows when kvm
fails to handle MC error and exit the guest.
- Fixed the code to restore r13 before exiting early handler.
Thanks,
-Mahesh.
---
Mahesh Salgaonkar (10):
powerpc/book3s: Split the common exception prolog logic into two section.
powerpc/book3s: Introduce exclusive emergency stack for machine check
exception.
powerpc/book3s: handle machine check in Linux host.
powerpc/book3s: Introduce a early machine check hook in cpu_spec.
powerpc/book3s: Add flush_tlb operation in cpu_spec.
powerpc/book3s: Flush SLB/TLBs if we get SLB/TLB machine check errors on
power7.
powerpc/book3s: Flush SLB/TLBs if we get SLB/TLB machine check errors on
power8.
powerpc/book3s: 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 | 67 ++++---
arch/powerpc/include/asm/mce.h | 195 ++++++++++++++++++++
arch/powerpc/include/asm/paca.h | 9 +
arch/powerpc/kernel/Makefile | 1
arch/powerpc/kernel/asm-offsets.c | 4
arch/powerpc/kernel/cpu_setup_power.S | 38 +++-
arch/powerpc/kernel/cputable.c | 16 ++
arch/powerpc/kernel/exceptions-64s.S | 108 +++++++++++
arch/powerpc/kernel/mce.c | 191 ++++++++++++++++++++
arch/powerpc/kernel/mce_power.c | 287 ++++++++++++++++++++++++++++++
arch/powerpc/kernel/setup_64.c | 8 +
arch/powerpc/kernel/traps.c | 15 ++
arch/powerpc/kvm/book3s_hv_ras.c | 50 +++--
arch/powerpc/platforms/powernv/opal.c | 84 ++++++---
arch/powerpc/xmon/xmon.c | 2
17 files changed, 998 insertions(+), 94 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
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