From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 680C42C0296; Thu, 13 Aug 2026 07:19:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786605552; cv=none; b=NaG9dkxMf8lxv6Xds9we0Xno6Ba2ER7sku9j/80s99AnSn0I+a9NATVuWxCBXsjTGL5zOnxwOqNNIQWUf9TH7ZhFl6JSlykiS2PatpD1HmVB3F8va/B7i+CU7RUkUojDu/x2S650XEfwB1xq5jy7Dk1bn0IcuErXQYBMRmbHCN0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786605552; c=relaxed/simple; bh=EC2zwG7oxy7+WlUSa2EaNA8dq4681GIh0Wx7RdB1omo=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=jhJCdvTwIsn4MfP6Bmc7P0y4WzBBtMkerWVdKc1iSdAko4AliLtLdf4QXI/0P4+sp+K3UH4pFfkLhDf/LrnG5A4lTzdsfgRXDJIBROeAZmYc6ra3rwUuyacUiCl/Hh3GByPH9p6IkWtX/zMktEQV3QcFNRB4nMxfmCvp8ifA7lc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 42fea39a96e711f1aa26b74ffac11d73-20260813 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.12,REQID:dd3d0fa6-05d4-4335-91f5-8acd60f9a65b,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:e7bac3a,CLOUDID:7e3bd00aa8c0169534ba9e0b3707b2b6,BulkI D:nil,BulkQuantity:0,Recheck:0,SF:102|136|850|865|898,TC:nil,Content:0|15| 50,EDM:-3|-100,IP:nil,URL:99|1,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL :0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_ULS X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 42fea39a96e711f1aa26b74ffac11d73-20260813 X-User: jiangfeng@kylinos.cn Received: from [127.0.0.1] [(10.44.16.150)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 1969336531; Thu, 13 Aug 2026 15:19:03 +0800 From: Feng Jiang Subject: [PATCH bpf-next v2 0/2] bpf, riscv: Add BPF stack arguments support for RV64 JIT Date: Thu, 13 Aug 2026 07:18:41 +0000 Message-Id: <20260813-bpf-riscv-stack-args-v2-0-efea8f9b3fe1@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIANFvfWoC/22NQQ6CMBBFr0Jm7Zi2SgFX3sOwKHWABlNIhzQQw t2tXbt8+XnvH8AUHDE8igMCRcdu9gnUpQA7Gj8QundiUEJpUakau6XH4NhG5NXYCU0YGPWtFG+ htZHUQFKXQL3bcvYFP8PTtkKbltHxOoc9/0WZ95yupfqfjhIF6qpTd10LTWXznPaP8zNfrYf2P M8vaECiVsMAAAA= X-Change-ID: 20260728-bpf-riscv-stack-args-6350d066a1e9 To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Luke Nelson , Xi Wang , =?utf-8?q?Bj=C3=B6rn_T=C3=B6pel?= , Pu Lehui , Puranjay Mohan , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Shuah Khan , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt Cc: bpf@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, llvm@lists.linux.dev, Feng Jiang X-Mailer: b4 0.14.3 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 --- Changes in v2: - Sign-extend 32-bit kfunc arguments passed on the stack (args 9+), matching the register path and the RISC-V psABI. (Sashiko) - Restrict the riscv selftest guard to __riscv_xlen == 64 so the tests are not enabled on RV32. (Sashiko) - Link to v1: https://lore.kernel.org/r/20260812-bpf-riscv-stack-args-v1-0-67b246806e59@kylinos.cn --- Feng Jiang (2): bpf, riscv: Add BPF stack arguments support for RV64 JIT selftests/bpf: Enable stack argument tests for RV64 arch/riscv/net/bpf_jit.h | 1 + arch/riscv/net/bpf_jit_comp64.c | 79 +++++++++++++++++++++- arch/riscv/net/bpf_jit_core.c | 4 ++ .../selftests/bpf/progs/btf__stack_arg_precision.c | 3 +- .../bpf/progs/btf__verifier_stack_arg_order.c | 3 +- tools/testing/selftests/bpf/progs/exceptions.c | 5 +- tools/testing/selftests/bpf/progs/stack_arg.c | 3 +- .../testing/selftests/bpf/progs/stack_arg_kfunc.c | 3 +- .../selftests/bpf/progs/stack_arg_precision.c | 3 +- .../selftests/bpf/progs/verifier_stack_arg.c | 3 +- .../selftests/bpf/progs/verifier_stack_arg_order.c | 3 +- 11 files changed, 98 insertions(+), 12 deletions(-) --- base-commit: d114bb98936770c501c958bf2bc5fb6b7c0bad7b change-id: 20260728-bpf-riscv-stack-args-6350d066a1e9 Best regards, -- Feng Jiang