From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 92E7CCA5FA3 for ; Mon, 28 Sep 2026 02:22:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=UWKYerp6SoUjIlTZHR/KHjZeV8W7YjF8dJ8nrZEnWzw=; b=FSqCw7gSk3mQGD NdFkQsJAZrYbozFzLOuzVTl1sZHTsc3I14gn/A5WVf4Y1kKmvAb1bsSBLUsnVvFMOfsN+CbGn04UW eKNIE9pD6jljrIy0Ok1DTwuHVOfyHKPdQaQbXPoHI1OGwrRlH3cB70w04f4LlECaL5YI7dzSAKiPS J62mSsMCh38Fhip6JwEW40YVFIHCpxQUwWsJeYglU4FtbCrjxSiQL6YhIKfBtSi8J/w28yp5+tNT9 +ecAMpS7t0Z/zoTbARFA3vcfZ6Qqez8k/rPFJ9dpDWeE8Xj2hChB2Cl6wlBWHUauocZqbfJQj39sZ twvK1kagcHUd+m5/FH2Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xB0zw-0000000HAEp-0ejW; Mon, 28 Sep 2026 02:21:44 +0000 Received: from out30-100.freemail.mail.aliyun.com ([115.124.30.100]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xB0zs-0000000HADX-261Q for linux-riscv@lists.infradead.org; Mon, 28 Sep 2026 02:21:42 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1790562093; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; bh=uO5TIYKBfsawqPiNAsCntfjYc2ZcPToZ1eaI1Kfnyk4=; b=KvOT07cECHFuZw7oy5tNtXWiPhYLUPm/clAFj4fINPiQRnDL7ePfbf6DrtylTzyX4v9ZauUNJZCCFTOPXz3VcmHcpY77K3YnuTHIlQvoLrrcJXvTUgs5iVSj1cB5K40WkASb6/PBMRKOW9HWxpE9PGlGbQ2VH3/Ai8t4cPtd8YA= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R691e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037009110;MF=cp0613@linux.alibaba.com;NM=1;PH=DS;RN=21;SR=0;TI=SMTPD_---0XBgzgGN_1790562069; Received: from DESKTOP-S9E58SO.localdomain(mailfrom:cp0613@linux.alibaba.com fp:SMTPD_---0XBgzgGN_1790562069 cluster:ay36) by smtp.aliyun-inc.com; Mon, 28 Sep 2026 10:21:30 +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 v2 0/2] bpf, riscv: Add support for indirect jumps Date: Mon, 28 Sep 2026 10:21:07 +0800 Message-ID: <20260928022109.1093-1-cp0613@linux.alibaba.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260927_192141_194316_60F3E321 X-CRM114-Status: UNSURE ( 8.57 ) X-CRM114-Notice: Please train this message. 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Received: from DESKTOP-S9E58SO.localdomain(mailfrom:cp0613@linux.alibaba.com fp:SMTPD_---0XBgzgGN_1790562069 cluster:ay36) by smtp.aliyun-inc.com; Mon, 28 Sep 2026 10:21:30 +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 v2 0/2] bpf, riscv: Add support for indirect jumps Date: Mon, 28 Sep 2026 10:21:07 +0800 Message-ID: <20260928022109.1093-1-cp0613@linux.alibaba.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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. Changes since v1: - Rebased onto bpf-next. - Patch 1: reword the code comment to say "shift ctx->offset[] by one". - Patch 2: collapse the multi-line #endif marker to a single line. - Added Reviewed-by/Acked-by from Björn Töpel. 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 | 6 ++++-- 3 files changed, 23 insertions(+), 4 deletions(-) -- 2.50.1