[v1,0/5] perf kvm: Add stat support on arm64

Message

Zenghui Yu June 12, 2019, 9:08 a.m. UTC

'perf kvm stat report/record' generates a statistical analysis of KVM
events and can be used to analyze guest exit reasons. This series tries
to add stat support on arm64 (Port perf-kvm-stat to arm64 - this is
already supported on x86).

"record" enables recording of two pair of tracepoints:
 - "kvm:kvm_entry" and "kvm:kvm_exit"
 - "kvm:kvm_trap_enter" and "kvm:kvm_trap_exit"
"report" reports statistical analysis of guest exit&trap events.

To record kvm events on the host:
 # perf kvm stat record -a

To report kvm VM EXIT events:
 # perf kvm stat report --event=vmexit

To report kvm VM TRAP (synchronous exceptions) events:
 # perf kvm stat report --event=trap

More information can be found at tools/perf/Documentation/perf-kvm.txt.

* Patch 1-2 touch KVM/ARM side, with #1 is cleanup and #2 is preparation
  for perf-kvm-stat support.
* Patch 3-5 touch perf side.
* Patch 3 adds support for get_cpuid() function on arm64. *RFC!*
* Patch 4 adds support for perf-kvm-stat on arm64, with VM-EXIT events.
* Patch 5 adds support to report TRAP-EVENT events.

Any suggestions, comments and test results will be appreciated.

Thanks,
zenghui

---

Zenghui Yu (5):
  KVM: arm/arm64: Remove kvm_mmio_emulate tracepoint
  KVM: arm/arm64: Adjust entry/exit and trap related tracepoints
  perf tools arm64: Add support for get_cpuid() function
  perf,kvm/arm64: Add stat support on arm64
  perf,kvm/arm64: perf-kvm-stat to report VM TRAP

 arch/arm64/kvm/handle_exit.c                     |   3 +
 arch/arm64/kvm/trace.h                           |  35 +++++++
 tools/perf/arch/arm64/Makefile                   |   2 +
 tools/perf/arch/arm64/util/Build                 |   1 +
 tools/perf/arch/arm64/util/aarch64_guest_exits.h |  91 +++++++++++++++++
 tools/perf/arch/arm64/util/header.c              |  74 +++++++++-----
 tools/perf/arch/arm64/util/kvm-stat.c            | 125 +++++++++++++++++++++++
 virt/kvm/arm/arm.c                               |   4 +-
 virt/kvm/arm/trace.h                             |  42 ++------
 9 files changed, 317 insertions(+), 60 deletions(-)
 create mode 100644 tools/perf/arch/arm64/util/aarch64_guest_exits.h
 create mode 100644 tools/perf/arch/arm64/util/kvm-stat.c