[PATCH v3 0/5] I/O Hook: Trace h/w access and emulate h/w events

[Rui Wang]

Hi All,
This is the 3rd version of I/O Hook, a patch set aimed at intercepting
h/w access by the OS. Some examples of how it can be used:
        1) To emulate h/w events (e.g. hotplug)
        2) To inject h/w errors to the kernel
        3) To trace h/w access by the OS for performance tuning or debugging.
Details of the examples can be found in Documentation/PCI/iohook.txt.

A set of user space tools using I/O Hook for various use cases will be hosted
on https://github.com/iohook. It initially contains inject-aer which takes the
trace event output of /sys/kernel/debug/tracing/events/ras/aer_event/ and
regenerate the same PCIE AER event so that PCIE AER can be easily tested.

Changes since v2:
        - Added the hook for MSRs (can specify a cpu number)
        - Can trigger IPI by a vector (so that exceptions can be emulated)
        - Defined iohook_event as the trace event to trace h/w access. A new
          attribute 'tc' can be defined for any Register Override for tracing
          purpose.

Rui Wang (5):
  I/O Hook: core functions and Register Override
  I/O Hook: Help functions to manage the hook
  I/O Hook: sysfs interface to emulate h/w events
  I/O Hook: Override MSRs while triggering MCEs
  IO Hook: Tracing hw access

 Documentation/PCI/iohook.txt      |  353 ++++++++++
 arch/Kconfig                      |   10 +
 arch/x86/boot/compressed/Makefile |    1 +
 arch/x86/include/asm/io.h         |   57 ++-
 arch/x86/include/asm/msr.h        |  100 +++-
 arch/x86/lib/msr-smp.c            |   31 +
 arch/x86/vdso/Makefile            |    2 +
 drivers/misc/Makefile             |    1 +
 drivers/misc/iohook/Makefile      |    1 +
 drivers/misc/iohook/iohook.c      | 1367 +++++++++++++++++++++++++++++++++++++
 drivers/misc/iohook/iohook.h      |    6 +
 drivers/pci/access.c              |   66 ++
 include/linux/reg_ovrd.h          |   55 ++
 include/trace/events/iohook.h     |   58 ++
 14 files changed, 2101 insertions(+), 7 deletions(-)
 create mode 100644 Documentation/PCI/iohook.txt
 create mode 100644 drivers/misc/iohook/Makefile
 create mode 100644 drivers/misc/iohook/iohook.c
 create mode 100644 drivers/misc/iohook/iohook.h
 create mode 100644 include/linux/reg_ovrd.h
 create mode 100644 include/trace/events/iohook.h

-- 
1.7.5.4

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