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Tue, 18 Mar 2025 07:29:52 -0700 (PDT) Received: from localhost.localdomain ([2a04:ee41:4:b2de:1ac0:4dff:fe0f:3782]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-395cb40cdd0sm18348071f8f.77.2025.03.18.07.29.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Mar 2025 07:29:52 -0700 (PDT) From: Anton Protopopov To: bpf@vger.kernel.org, Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Yonghong Song , Quentin Monnet , Anton Protopopov , Alexei Starovoitov Subject: [RFC PATCH bpf-next 07/14] bpf: save the start of functions in bpf_prog_aux Date: Tue, 18 Mar 2025 14:33:11 +0000 Message-Id: <20250318143318.656785-8-aspsk@isovalent.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250318143318.656785-1-aspsk@isovalent.com> References: <20250318143318.656785-1-aspsk@isovalent.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net X-Patchwork-State: RFC Introduce a new subprog_start field in bpf_prog_aux. This field may be used by JIT compilers wanting to know the real absolute xlated offset of the function being jitted. The func_info[func_id] may have served this purpose, but func_info may be NULL, so JIT compilers can't rely on it. Signed-off-by: Anton Protopopov --- include/linux/bpf.h | 1 + kernel/bpf/verifier.c | 1 + 2 files changed, 2 insertions(+) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 42ddd2b61866..fb0910083b79 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1524,6 +1524,7 @@ struct bpf_prog_aux { u32 ctx_arg_info_size; u32 max_rdonly_access; u32 max_rdwr_access; + u32 subprog_start; struct btf *attach_btf; struct bpf_ctx_arg_aux *ctx_arg_info; void __percpu *priv_stack_ptr; diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 0860ef57d5af..7f66002071ed 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -20999,6 +20999,7 @@ static int jit_subprogs(struct bpf_verifier_env *env) func[i]->aux->func_idx = i; /* Below members will be freed only at prog->aux */ func[i]->aux->btf = prog->aux->btf; + func[i]->aux->subprog_start = subprog_start; func[i]->aux->func_info = prog->aux->func_info; func[i]->aux->func_info_cnt = prog->aux->func_info_cnt; func[i]->aux->poke_tab = prog->aux->poke_tab;