From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-118.freemail.mail.aliyun.com (out30-118.freemail.mail.aliyun.com [115.124.30.118]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 49B73329E6C; Wed, 23 Sep 2026 13:09:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.118 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790168980; cv=none; b=mwYzC2djytR4OcAtidevhhdVqrjYTeX1Q/grSZCPWc+omgesG9eFrKNAtTdhWaGuK1rFiLyAOZIDlqnCJA1vuzQAxcvZewzRxKX0huG/YNVaDf7rVet5F7/LC7jSpr4cLeW1Qo7FL4I5LMNMneQ7+OhZXEpdIuBRDxSK16JET2g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790168980; c=relaxed/simple; bh=LQ9k+WQNRVpOruFMteZlfUVv7ex2UbNfF1vhuzFymEE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=S1SoOfl134TOmxHbhYVOTQKs8omtYcC08aAXff7mHt4TijIQx39mgk9vv17A1MDeNZCKjniNixZDCumITyq78TZ0doR1ppsWDP08yj050BCmGDE8FGqVHDKveKIJS7+NpASsMN0FLiO0fT/upXuq0BG91KrU4m7sm+5fKFHwDMU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=WcIJi0Dl; arc=none smtp.client-ip=115.124.30.118 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="WcIJi0Dl" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1790168967; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=dVPfmbTv+JM2jarPBZCBYnAw22AyOzA3cOqy6hp9N2c=; b=WcIJi0Dl9LrYUV5ZHM9LD/3h+tVkQKHVWYceECyZGMK112Ommf6P7qq/kFzEj6vM3tNd51N9Em2mBIg2NzXOtHvW++7wJYhH1edS5aRfqPSs4GQGd1CAompsLvE10PUPo492SHTo88hGJVfzG/+MFGX1a9f9GdLfeqdZXRm5K40= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R161e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam011083073210;MF=cp0613@linux.alibaba.com;NM=1;PH=DS;RN=21;SR=0;TI=SMTPD_---0XBX4ZCL_1790168937; Received: from DESKTOP-S9E58SO.localdomain(mailfrom:cp0613@linux.alibaba.com fp:SMTPD_---0XBX4ZCL_1790168937 cluster:ay36) by smtp.aliyun-inc.com; Wed, 23 Sep 2026 21:09:26 +0800 From: Chen Pei To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, memxor@gmail.com, bjorn@kernel.org, puranjay@kernel.org Cc: ihor.solodrai@linux.dev, eddyz87@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, pulehui@huawei.com, pjw@kernel.org, palmer@dabbelt.com, shuah@kernel.org, guoren@kernel.org, bpf@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH bpf-next 0/2] bpf, riscv: Add support for indirect jumps Date: Wed, 23 Sep 2026 21:08:54 +0800 Message-ID: <20260923130856.1157-1-cp0613@linux.alibaba.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The indirect jump instruction (BPF_JMP | BPF_JA | BPF_X, "gotox") and the BPF_MAP_TYPE_INSN_ARRAY jump tables it consumes are core features: the verifier accepts them on every architecture, and the x86-64, arm64 and powerpc JITs implement them. On riscv64 a program using gotox passes verification and then fails to load, because the JIT does not know the opcode and CONFIG_BPF_JIT_ALWAYS_ON leaves no interpreter to fall back onto. This series adds the riscv64 support and turns the existing selftests on for that architecture. Patch 1 emits "jalr zero, rd, 0" for gotox and publishes the xlated to jitted offsets through bpf_prog_update_insn_ptrs(), which is what fills in the jump table addresses. Patch 2 widens the arch guard in verifier_gotox.c to riscv64, the same way arm64 and powerpc were enabled. Testing ======= Environment: QEMU virt rv64, with CONFIG_BPF_JIT=y, CONFIG_BPF_JIT_ALWAYS_ON=y, CONFIG_DEBUG_INFO_BTF=y; selftests cross-built with clang 22. - test_progs -t verifier_gotox: 27/27 subtests pass on bpf-next, 13 of them executed through BPF_PROG_TEST_RUN. - test_progs-cpuv4 -t bpf_gotox: 14/14 subtests pass, none skipped. The cpuv4 flavor is needed here because bpf_gotox gates its subtests on __BPF_FEATURE_GOTOX, which clang only defines for -mcpu=v4. Chen Pei (2): bpf, riscv: Add support for indirect jumps selftests/bpf: Enable gotox tests for riscv64 arch/riscv/net/bpf_jit_comp64.c | 5 +++++ arch/riscv/net/bpf_jit_core.c | 16 ++++++++++++++-- .../testing/selftests/bpf/progs/verifier_gotox.c | 8 ++++++-- 3 files changed, 25 insertions(+), 4 deletions(-) -- 2.50.1