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(unknown [9.124.222.159]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 22 Jan 2026 21:19:00 +0000 (GMT) From: adubey@linux.ibm.com To: bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: hbathini@linux.ibm.com, sachinpb@linux.ibm.com, venkat88@linux.ibm.com, andrii@kernel.org, eddyz87@gmail.com, mykolal@fb.com, ast@kernel.org, daniel@iogearbox.net, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, christophe.leroy@csgroup.eu, naveen@kernel.org, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, memxor@gmail.com, iii@linux.ibm.com, shuah@kernel.org Subject: [PATCH v4 0/6] powerpc64/bpf: Support tailcalls with subprogs & BPF exceptions Date: Fri, 23 Jan 2026 02:48:48 +0530 Message-ID: <20260122211854.5508-1-adubey@linux.ibm.com> X-Mailer: git-send-email 2.48.1 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=WMdyn3sR c=1 sm=1 tr=0 ts=69729451 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=iIzsfX1pHA8hvRYzEnUA:9 X-Proofpoint-GUID: lVXSJcuh1r-XOp_8FEYyCj_uHOMajrQ2 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTIyMDE2MiBTYWx0ZWRfX/HOzoq6wem5l Pjmsabe9xifKkX/23IMEqTICiuRU8b+sG0tefJpmevnWd0+TdOifqnmd99W4DBg28Ze9uT2l179 Ik2Ilh7+lnVsR27XN0HZ37/wdxm1jcC7M91VWvQZ8BwTkDilenB2CylvMft6nAJ3mNl4hS7iBAr 9tudUYYb7xcAgOPwda0iMlrStmaZQLsSQ1hA+CSlklouRgSxNs/lwt9TJ6TDqRygdksNv6HkXNQ rBceILPOjp1iYrt6d5diFkhJtuDI5yq+AIxkxcYpoTLa8dE8tdoSvH+uc4U5qOVpGpXlEyd/VMQ mLbd7CqpnuXjKw6zbZY6ay+dQausTmdRz2G/DVoejFc3EAL/egeM5KW3q8kPW4xwfXCyUVtxK4z JHCae8PngRsQW1rsSJdd3A2uP5jzfctNaNMw/FurfYtdPG5TZeZ152qPyMrI+KQGGwfZIVSq0cK +zWQIBiT5rtKE9biR3g== X-Proofpoint-ORIG-GUID: 1j3Mzri4C22PWEG7M9RYSQT3pivWuPeL X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.20,FMLib:17.12.100.49 definitions=2026-01-22_05,2026-01-22_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 suspectscore=0 bulkscore=0 adultscore=0 impostorscore=0 spamscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601220162 From: Abhishek Dubey This patch series enables support for two BPF JIT features on powerpc64. The first three patches target support for tail calls with subprogram combinations. The first patch supports realignment of tail_call_cnt offset in stack frame. Implementation details are provided in the commit messages. The last three patches add support for BPF exceptions. An architecture-specific stack walker is implemented to assist with stack walk during exceptions. All selftests related to tailcalls and exceptions are passing: # ./test_progs -t tailcalls #442/1 tailcalls/tailcall_1:OK #442/2 tailcalls/tailcall_2:OK #442/3 tailcalls/tailcall_3:OK #442/4 tailcalls/tailcall_4:OK #442/5 tailcalls/tailcall_5:OK #442/6 tailcalls/tailcall_6:OK #442/7 tailcalls/tailcall_bpf2bpf_1:OK #442/8 tailcalls/tailcall_bpf2bpf_2:OK #442/9 tailcalls/tailcall_bpf2bpf_3:OK #442/10 tailcalls/tailcall_bpf2bpf_4:OK #442/11 tailcalls/tailcall_bpf2bpf_5:OK #442/12 tailcalls/tailcall_bpf2bpf_6:OK #442/13 tailcalls/tailcall_bpf2bpf_fentry:OK #442/14 tailcalls/tailcall_bpf2bpf_fexit:OK #442/15 tailcalls/tailcall_bpf2bpf_fentry_fexit:OK #442/16 tailcalls/tailcall_bpf2bpf_fentry_entry:OK #442/17 tailcalls/tailcall_poke:OK #442/18 tailcalls/tailcall_bpf2bpf_hierarchy_1:OK #442/19 tailcalls/tailcall_bpf2bpf_hierarchy_fentry:OK #442/20 tailcalls/tailcall_bpf2bpf_hierarchy_fexit:OK #442/21 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_fexit:OK #442/22 tailcalls/tailcall_bpf2bpf_hierarchy_fentry_entry:OK #442/23 tailcalls/tailcall_bpf2bpf_hierarchy_2:OK #442/24 tailcalls/tailcall_bpf2bpf_hierarchy_3:OK #442/25 tailcalls/tailcall_freplace:OK #442/26 tailcalls/tailcall_bpf2bpf_freplace:OK #442/27 tailcalls/tailcall_failure:OK #442/28 tailcalls/reject_tail_call_spin_lock:OK #442/29 tailcalls/reject_tail_call_rcu_lock:OK #442/30 tailcalls/reject_tail_call_preempt_lock:OK #442/31 tailcalls/reject_tail_call_ref:OK #442 tailcalls:OK Summary: 1/31 PASSED, 0 SKIPPED, 0 FAILED # ./test_progs -t exceptions #105/1 exceptions/exception_throw_always_1:OK #105/2 exceptions/exception_throw_always_2:OK #105/3 exceptions/exception_throw_unwind_1:OK #105/4 exceptions/exception_throw_unwind_2:OK #105/5 exceptions/exception_throw_default:OK #105/6 exceptions/exception_throw_default_value:OK #105/7 exceptions/exception_tail_call:OK #105/8 exceptions/exception_ext:OK #105/9 exceptions/exception_ext_mod_cb_runtime:OK #105/10 exceptions/exception_throw_subprog:OK #105/11 exceptions/exception_assert_nz_gfunc:OK #105/12 exceptions/exception_assert_zero_gfunc:OK #105/13 exceptions/exception_assert_neg_gfunc:OK #105/14 exceptions/exception_assert_pos_gfunc:OK #105/15 exceptions/exception_assert_negeq_gfunc:OK #105/16 exceptions/exception_assert_poseq_gfunc:OK #105/17 exceptions/exception_assert_nz_gfunc_with:OK #105/18 exceptions/exception_assert_zero_gfunc_with:OK #105/19 exceptions/exception_assert_neg_gfunc_with:OK #105/20 exceptions/exception_assert_pos_gfunc_with:OK #105/21 exceptions/exception_assert_negeq_gfunc_with:OK #105/22 exceptions/exception_assert_poseq_gfunc_with:OK #105/23 exceptions/exception_bad_assert_nz_gfunc:OK #105/24 exceptions/exception_bad_assert_zero_gfunc:OK #105/25 exceptions/exception_bad_assert_neg_gfunc:OK #105/26 exceptions/exception_bad_assert_pos_gfunc:OK #105/27 exceptions/exception_bad_assert_negeq_gfunc:OK #105/28 exceptions/exception_bad_assert_poseq_gfunc:OK #105/29 exceptions/exception_bad_assert_nz_gfunc_with:OK #105/30 exceptions/exception_bad_assert_zero_gfunc_with:OK #105/31 exceptions/exception_bad_assert_neg_gfunc_with:OK #105/32 exceptions/exception_bad_assert_pos_gfunc_with:OK #105/33 exceptions/exception_bad_assert_negeq_gfunc_with:OK #105/34 exceptions/exception_bad_assert_poseq_gfunc_with:OK #105/35 exceptions/exception_assert_range:OK #105/36 exceptions/exception_assert_range_with:OK #105/37 exceptions/exception_bad_assert_range:OK #105/38 exceptions/exception_bad_assert_range_with:OK #105/39 exceptions/non-throwing fentry -> exception_cb:OK #105/40 exceptions/throwing fentry -> exception_cb:OK #105/41 exceptions/non-throwing fexit -> exception_cb:OK #105/42 exceptions/throwing fexit -> exception_cb:OK #105/43 exceptions/throwing extension (with custom cb) -> exception_cb:OK #105/44 exceptions/throwing extension -> global func in exception_cb:OK #105/45 exceptions/exception_ext_mod_cb_runtime:OK #105/46 exceptions/throwing extension (with custom cb) -> global func in exception_cb:OK #105/47 exceptions/exception_ext:OK #105/48 exceptions/non-throwing fentry -> non-throwing subprog:OK #105/49 exceptions/throwing fentry -> non-throwing subprog:OK #105/50 exceptions/non-throwing fentry -> throwing subprog:OK #105/51 exceptions/throwing fentry -> throwing subprog:OK #105/52 exceptions/non-throwing fexit -> non-throwing subprog:OK #105/53 exceptions/throwing fexit -> non-throwing subprog:OK #105/54 exceptions/non-throwing fexit -> throwing subprog:OK #105/55 exceptions/throwing fexit -> throwing subprog:OK #105/56 exceptions/non-throwing fmod_ret -> non-throwing subprog:OK #105/57 exceptions/non-throwing fmod_ret -> non-throwing global subprog:OK #105/58 exceptions/non-throwing extension -> non-throwing subprog:OK #105/59 exceptions/non-throwing extension -> throwing subprog:OK #105/60 exceptions/non-throwing extension -> non-throwing subprog:OK #105/61 exceptions/non-throwing extension -> throwing global subprog:OK #105/62 exceptions/throwing extension -> throwing global subprog:OK #105/63 exceptions/throwing extension -> non-throwing global subprog:OK #105/64 exceptions/non-throwing extension -> main subprog:OK #105/65 exceptions/throwing extension -> main subprog:OK #105/66 exceptions/reject_exception_cb_type_1:OK #105/67 exceptions/reject_exception_cb_type_2:OK #105/68 exceptions/reject_exception_cb_type_3:OK #105/69 exceptions/reject_exception_cb_type_4:OK #105/70 exceptions/reject_async_callback_throw:OK #105/71 exceptions/reject_with_lock:OK #105/72 exceptions/reject_subprog_with_lock:OK #105/73 exceptions/reject_with_rcu_read_lock:OK #105/74 exceptions/reject_subprog_with_rcu_read_lock:OK #105/75 exceptions/reject_with_rbtree_add_throw:OK #105/76 exceptions/reject_with_reference:OK #105/77 exceptions/reject_with_cb_reference:OK #105/78 exceptions/reject_with_cb:OK #105/79 exceptions/reject_with_subprog_reference:OK #105/80 exceptions/reject_throwing_exception_cb:OK #105/81 exceptions/reject_exception_cb_call_global_func:OK #105/82 exceptions/reject_exception_cb_call_static_func:OK #105/83 exceptions/reject_multiple_exception_cb:OK #105/84 exceptions/reject_exception_throw_cb:OK #105/85 exceptions/reject_exception_throw_cb_diff:OK #105/86 exceptions/reject_set_exception_cb_bad_ret1:OK #105/87 exceptions/reject_set_exception_cb_bad_ret2:OK #105/88 exceptions/check_assert_eq_int_min:OK #105/89 exceptions/check_assert_eq_int_max:OK #105/90 exceptions/check_assert_eq_zero:OK #105/91 exceptions/check_assert_eq_llong_min:OK #105/92 exceptions/check_assert_eq_llong_max:OK #105/93 exceptions/check_assert_lt_pos:OK #105/94 exceptions/check_assert_lt_zero:OK #105/95 exceptions/check_assert_lt_neg:OK #105/96 exceptions/check_assert_le_pos:OK #105/97 exceptions/check_assert_le_zero:OK #105/98 exceptions/check_assert_le_neg:OK #105/99 exceptions/check_assert_gt_pos:OK #105/100 exceptions/check_assert_gt_zero:OK #105/101 exceptions/check_assert_gt_neg:OK #105/102 exceptions/check_assert_ge_pos:OK #105/103 exceptions/check_assert_ge_zero:OK #105/104 exceptions/check_assert_ge_neg:OK #105/105 exceptions/check_assert_range_s64:OK #105/106 exceptions/check_assert_range_u64:OK #105/107 exceptions/check_assert_single_range_s64:OK #105/108 exceptions/check_assert_single_range_u64:OK #105/109 exceptions/check_assert_generic:OK #105/110 exceptions/check_assert_with_return:OK #105 exceptions:OK Summary: 1/110 PASSED, 0 SKIPPED, 0 FAILED [v1]: https://lore.kernel.org/all/20260105105212.136645-1-adubey@linux.ibm.com/ [v2]: https://lore.kernel.org/all/20260114114450.30405-1-adubey@linux.ibm.com/ [v3]: https://lore.kernel.org/all/20260122165716.10508-1-adubey@linux.ibm.com/ Changes v3->v4: Handle bpf-ci warnings Changes v2->v3: Added PPC_BCC_CONST_SHORT for short jumps of constant offset Optimize tailcall allocation for BPF_TRAMP_F_CALL_ORIG flag New helper for stack size calculation during exceptions Prologue JIT optimizations during non exception prog case Changes v1->v2: Move tail_call_cnt to offset 0 in stack frame Remove trampoline NVR remapping-patch3/6[v1] Abhishek Dubey (6): powerpc64/bpf: Moving tail_call_cnt to bottom of frame powerpc64/bpf: Support tailcalls with subprogs powerpc64/bpf: Avoid tailcall restore from trampoline powerpc64/bpf: Add arch_bpf_stack_walk() for BPF JIT powerpc64/bpf: Support exceptions powerpc64/bpf: Additional NVR handling for bpf_throw arch/powerpc/net/bpf_jit.h | 16 ++ arch/powerpc/net/bpf_jit_comp.c | 88 ++++++++-- arch/powerpc/net/bpf_jit_comp64.c | 256 ++++++++++++++++++++++++------ 3 files changed, 297 insertions(+), 63 deletions(-) -- 2.48.1