mbox series

[v2,0/7] plugins: access values during a memory read/write

Message ID 20240626233757.375083-1-pierrick.bouvier@linaro.org (mailing list archive)
Headers show
Series plugins: access values during a memory read/write | expand

Message

Pierrick Bouvier June 26, 2024, 11:37 p.m. UTC 
This series allows plugins to know which value is read/written during a memory
access.

For every memory access, we know copy this value before calling mem callbacks,
and those can query it using new API functions:
- qemu_plugin_mem_get_value_upper_bits
- qemu_plugin_mem_get_value_lower_bits

Mem plugin was extended to print accesses, and a new test was added to check
functionality work as expected. A bug was found where callbacks were not
called as expected.

This will open new use cases for plugins, such as following specific values in
memory.

v2
--

fix compilation on aarch64 (missing undef in accel/tcg/atomic_template.h)

Pierrick Bouvier (7):
  plugins: fix mem callback array size
  plugins: save value during memory accesses
  plugins: extend API to get latest memory value accessed
  tests/tcg: add mechanism to run specific tests with plugins
  tests/tcg: allow to check output of plugins
  tests/plugin/mem: add option to print memory accesses
  tests/tcg/x86_64: add test for plugin memory access

 accel/tcg/atomic_template.h                 | 66 +++++++++++++--
 include/qemu/plugin.h                       |  8 ++
 include/qemu/qemu-plugin.h                  | 20 +++++
 accel/tcg/plugin-gen.c                      |  3 +-
 plugins/api.c                               | 21 +++++
 plugins/core.c                              |  7 ++
 tcg/tcg-op-ldst.c                           | 72 +++++++++++++++--
 tests/plugin/mem.c                          | 28 ++++++-
 tests/tcg/x86_64/test-plugin-mem-access.c   | 89 +++++++++++++++++++++
 accel/tcg/atomic_common.c.inc               | 13 ++-
 accel/tcg/ldst_common.c.inc                 | 38 +++++----
 plugins/qemu-plugins.symbols                |  2 +
 tests/tcg/Makefile.target                   |  8 +-
 tests/tcg/x86_64/Makefile.target            |  7 ++
 tests/tcg/x86_64/check-plugin-mem-access.sh | 48 +++++++++++
 15 files changed, 395 insertions(+), 35 deletions(-)
 create mode 100644 tests/tcg/x86_64/test-plugin-mem-access.c
 create mode 100755 tests/tcg/x86_64/check-plugin-mem-access.sh