Today libbpf can attach a single kprobe only by function name, with an
optional offset. But the kernel also supports attaching a single kprobe
directly by raw kernel address, through both legacy tracefs/debugfs
kprobes and PMU-based non-legacy kprobes. Since libbpf doesn't support
this yet, callers that already have a target IP still have to drop down
to perf_event_open() or direct tracefs writes.

This patchset adds address-based single-kprobe attach support to
bpf_program__attach_kprobe_opts() and covers it in selftests/bpf. The
first commit adds bpf_kprobe_opts.addr so that libbpf can attach single
kprobes by raw address through both legacy tracefs/debugfs and PMU-based
non-legacy paths. The second commit extends attach_probe selftests/bpf
with address-based kprobe attach subtests for these paths.

---
Changes in v2:
- Fix line wrapping and indentation

Hoyeon Lee (2):
  libbpf: allow address-based single kprobe attach
  selftests/bpf: add test for address-based single kprobe attach

 tools/lib/bpf/libbpf.c                        | 88 +++++++++++++------
 tools/lib/bpf/libbpf.h                        |  5 +-
 .../selftests/bpf/prog_tests/attach_probe.c   | 49 +++++++++++
 3 files changed, 114 insertions(+), 28 deletions(-)

-- 
2.52.0