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[bpf-next,0/5] bpf: resilient split BTF followups

Message ID 20240618162449.809994-1-alan.maguire@oracle.com (mailing list archive)
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Series bpf: resilient split BTF followups | expand

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Alan Maguire June 18, 2024, 4:24 p.m. UTC 
Follow-up to resilient split BTF series [1],

- cleaning up libbpf relocation code (patch 1);
- adding 'struct module' support for base BTF data (patch 2);
- sharing libbpf relocation code with the kernel (patch 3);
- adding a kbuild --btf_features flag to generate distilled base
  BTF in the module-specific case where KBUILD_EXTMOD is true
  (patch 4); and
- adding test coverage for module-based kfunc dtor (patch 5)

Generation of distilled base BTF for modules requires the pahole patch
at [2], but without it we just won't get distilled base BTF (and thus BTF
relocation on module load) for bpf_testmod.ko.

[1] https://lore.kernel.org/bpf/20240613095014.357981-1-alan.maguire@oracle.com/
[2] https://lore.kernel.org/bpf/20240517102714.4072080-1-alan.maguire@oracle.com/

Alan Maguire (5):
  libbpf: BTF relocation followup fixing naming, loop logic
  module, bpf: store BTF base pointer in struct module
  libbpf,bpf: share BTF relocate-related code with kernel
  kbuild,bpf: add module-specific pahole flags for distilled base BTF
  selftests/bpf: add kfunc_call test for simple dtor in bpf_testmod

 include/linux/btf.h                           |  64 +++++++
 include/linux/module.h                        |   2 +
 kernel/bpf/Makefile                           |  10 +-
 kernel/bpf/btf.c                              | 176 ++++++++++++-----
 kernel/module/main.c                          |   5 +-
 scripts/Makefile.btf                          |   5 +
 scripts/Makefile.modfinal                     |   2 +-
 tools/lib/bpf/Build                           |   2 +-
 tools/lib/bpf/btf.c                           | 162 ----------------
 tools/lib/bpf/btf_iter.c                      | 177 ++++++++++++++++++
 tools/lib/bpf/btf_relocate.c                  |  97 ++++++----
 .../selftests/bpf/bpf_testmod/bpf_testmod.c   |  46 +++++
 .../bpf/bpf_testmod/bpf_testmod_kfunc.h       |   9 +
 .../selftests/bpf/prog_tests/kfunc_call.c     |   1 +
 .../selftests/bpf/progs/kfunc_call_test.c     |  14 ++
 15 files changed, 513 insertions(+), 259 deletions(-)
 create mode 100644 tools/lib/bpf/btf_iter.c