[Qemu-devel] [PATCH v2 0/6] hypertrace: Lightweight guest-to-QEMU trace channel

[Lluís Vilanova]

The hypertrace channel allows guest code to emit events in QEMU (the host) using
its tracing infrastructure (see "docs/trace.txt"). This works in both 'system'
and 'user' modes, is architecture-agnostic and introduces minimal noise on the
guest.

See first commit for a full description, use-cases and an example.

Signed-off-by: Lluís Vilanova <address@hidden>
---

Changes in v2
=============

* Remove unnecessary casts for g2h() [Eric Blake].
* Use perror() [Eric Blake].
* Avoid expansions in application example [Eric Blake].
* Add copyright in document "hypertrace.txt" [Eric Blake].
* Make the user-mode hypertrace invocations thread-safe [Stefan Hajnoczi].
* Split dynamic hypertrace configuration into a separate "config" channel.

Changes in v3
=============

* Fix calculation of arguments.
* Rebase on e00da55

Lluís Vilanova (6):
      hypertrace: Add documentation
      hypertrace: Add tracing event "guest_hypertrace"
      hypertrace: [*-user] Add QEMU-side proxy to "guest_hypertrace" event
      hypertrace: [softmmu] Add QEMU-side proxy to "guest_hypertrace" event
      hypertrace: Add guest-side user-level library
      hypertrace: Add guest-side Linux module


 Makefile                                           |    8 
 Makefile.objs                                      |    6 
 bsd-user/main.c                                    |   16 +
 bsd-user/mmap.c                                    |   15 +
 bsd-user/syscall.c                                 |   31 +-
 configure                                          |   40 ++
 docs/hypertrace.txt                                |  227 +++++++++++++
 docs/tracing.txt                                   |    3 
 hypertrace/Makefile.objs                           |   21 +
 hypertrace/common.c                                |   26 ++
 hypertrace/common.h                                |   24 +
 hypertrace/guest/linux-module/Kbuild.in            |    7 
 hypertrace/guest/linux-module/Makefile             |   23 +
 .../include/linux/qemu-hypertrace-internal.h       |   46 +++
 .../linux-module/include/linux/qemu-hypertrace.h   |   73 ++++
 hypertrace/guest/linux-module/qemu-hypertrace.c    |  146 +++++++++
 hypertrace/guest/user/Makefile                     |   30 ++
 hypertrace/guest/user/common.c                     |  301 ++++++++++++++++++
 hypertrace/guest/user/qemu-hypertrace.h            |   80 +++++
 hypertrace/softmmu.c                               |  235 ++++++++++++++
 hypertrace/user.c                                  |  339 ++++++++++++++++++++
 hypertrace/user.h                                  |   61 ++++
 include/hw/pci/pci.h                               |    2 
 include/qom/cpu.h                                  |    4 
 linux-user/main.c                                  |   19 +
 linux-user/mmap.c                                  |   17 +
 linux-user/qemu.h                                  |    3 
 linux-user/syscall.c                               |   31 +-
 trace/Makefile.objs                                |    2 
 29 files changed, 1809 insertions(+), 27 deletions(-)
 create mode 100644 docs/hypertrace.txt
 create mode 100644 hypertrace/Makefile.objs
 create mode 100644 hypertrace/common.c
 create mode 100644 hypertrace/common.h
 create mode 100644 hypertrace/guest/linux-module/Kbuild.in
 create mode 100644 hypertrace/guest/linux-module/Makefile
 create mode 100644 
hypertrace/guest/linux-module/include/linux/qemu-hypertrace-internal.h
 create mode 100644 
hypertrace/guest/linux-module/include/linux/qemu-hypertrace.h
 create mode 100644 hypertrace/guest/linux-module/qemu-hypertrace.c
 create mode 100644 hypertrace/guest/user/Makefile
 create mode 100644 hypertrace/guest/user/common.c
 create mode 100644 hypertrace/guest/user/qemu-hypertrace.h
 create mode 100644 hypertrace/softmmu.c
 create mode 100644 hypertrace/user.c
 create mode 100644 hypertrace/user.h


To: address@hidden
Cc: Stefan Hajnoczi <address@hidden>
Cc: Eric Blake <address@hidden>
Cc: Luiz Capitulino <address@hidden>
Cc: Daniel P Berrange <address@hidden>