[bpf-next,0/2] bpf, x64: Introduce two tailcall enhancements

Message

Leon Hwang Oct. 21, 2024, 1:39 p.m. UTC

This patch set introduces two enhancements aimed at improving tailcall
handling in the x64 JIT:

1. Tailcall info is propagated to a subprog only if the subprog is
   tail_call_reachable.
2. Tailcall info is propagated through the trampoline only when the target
   is a subprog and it is tail_call_reachable.

Leon Hwang (2):
  bpf, x64: Propagate tailcall info only for tail_call_reachable
    subprogs
  bpf, verifier: Check trampoline attach target is tail_call_reachable
    subprog

 arch/x86/net/bpf_jit_comp.c |  4 +++-
 include/linux/bpf.h         |  1 +
 kernel/bpf/verifier.c       | 10 +++++++++-
 3 files changed, 13 insertions(+), 2 deletions(-)