On Mon, Jul 26, 2021, at 13:12, Andrii Nakryiko wrote:

Wire through user_ctx for all attach APIs that use perf_event_open under the
hood:
  - for kprobes, extend existing bpf_kprobe_opts with user_ctx field;
  - for perf_event, uprobe, and tracepoint APIs, add their _opts variants and
    pass user_ctx through opts.

For kernel that don't support BPF_LINK_CREATE for perf_events, and thus
user_ctx is not supported either, return error and log warning for user.

Cc: Rafael David Tinoco <redacted>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

I think this one is fuzzy in v2. Checking them now for my purposes. Thanks for CC'ing.