[bpf-next PATCH 0/2] bpf, riscv: Add BPF stack arguments support for RV64 JIT

[Feng Jiang]

Port the BPF stack argument feature (BPF_REG_PARAMS / r11) to the
RV64 JIT, matching what x86 and arm64 already do.

BPF-to-BPF calls keep all extra arguments on the stack.  For kfunc
calls, the JIT loads arguments 6-8 into A5-A7 at the call site to
satisfy the RISC-V C calling convention.

Tested on riscv64 QEMU with LLVM main [1]; BPF-to-BPF and kfunc
selftests pass.

[1] https://github.com/llvm/llvm-project/pull/189060

Signed-off-by: Feng Jiang <jiangfeng@xxxxxxxxxx>
---
Feng Jiang (2):
      bpf, riscv: Add BPF stack arguments support for RV64 JIT
      selftests/bpf: Enable stack argument tests for riscv

 arch/riscv/net/bpf_jit.h                           |  1 +
 arch/riscv/net/bpf_jit_comp64.c                    | 75 +++++++++++++++++++++-
 arch/riscv/net/bpf_jit_core.c                      |  4 ++
 .../selftests/bpf/progs/btf__stack_arg_precision.c |  2 +-
 .../bpf/progs/btf__verifier_stack_arg_order.c      |  2 +-
 tools/testing/selftests/bpf/progs/exceptions.c     |  2 +-
 tools/testing/selftests/bpf/progs/stack_arg.c      |  2 +-
 .../testing/selftests/bpf/progs/stack_arg_kfunc.c  |  2 +-
 .../selftests/bpf/progs/stack_arg_precision.c      |  2 +-
 .../selftests/bpf/progs/verifier_stack_arg.c       |  2 +-
 .../selftests/bpf/progs/verifier_stack_arg_order.c |  2 +-
 11 files changed, 85 insertions(+), 11 deletions(-)
---
base-commit: d114bb98936770c501c958bf2bc5fb6b7c0bad7b
change-id: 20260728-bpf-riscv-stack-args-6350d066a1e9

Best regards,
-- 
Feng Jiang <jiangfeng@xxxxxxxxxx>