[PATCH 0/2] Disable ftrace during kvm guest entry/exit

[Naveen N. Rao]

This is a follow on from the RFC posted at:
https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg130047.html

This series implements a new field in paca called 'ftrace_disabled' to 
be set whenever we want to skip function tracing. This is currently only 
used by KVM guest entry/exit and as such, it is guarded in CONFIG_KVM as 
suggested by Steven Rostedt. This has had some minimal testing, and I 
will continue to test it this week and report back if I see any issues.

- Naveen


Naveen N. Rao (2):
  powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code
    paths
  powerpc64/ftrace: Disable ftrace during kvm guest entry/exit

 arch/powerpc/include/asm/paca.h                |  1 +
 arch/powerpc/kernel/asm-offsets.c              |  1 +
 arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 13 +++++++++++++
 arch/powerpc/kernel/trace/ftrace_64_pg.S       |  6 ++++++
 arch/powerpc/kvm/book3s_hv_rmhandlers.S        |  8 ++++++++
 5 files changed, 29 insertions(+)

-- 
2.16.2