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Tue, 02 Jun 2026 13:59:09 -0700 (PDT) Received: from computer.goose-salary.ts.net ([2a09:bac5:3b4a:11cd::1c6:2]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c85df043223sm157354a12.8.2026.06.02.13.58.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jun 2026 13:59:09 -0700 (PDT) From: Varun R Mallya To: bpf@vger.kernel.org, linux-riscv@lists.infradead.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, bjorn@kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, puranjay@kernel.org, menglong8.dong@gmail.com Cc: martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, pulehui@huawei.com, alex@ghiti.fr, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, varunrmallya@gmail.com Subject: [PATCH bpf-next 0/2] RISC-V JIT support for bpf_get_current_task/_btf Date: Wed, 3 Jun 2026 02:28:45 +0530 Message-ID: <20260602205847.102825-1-varunrmallya@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit These two patches add support for the bpf_get_current_task and bpf_get_current_task_btf kfuncs in RISC-V JIT and add a selftest. The first patch adds support for cpu and feature detection on the JIT disassembly helper function as RISC-V JITed code was not being disassembled using `LLVMCreateDisasm` as it was missing the "+c" CPU feature and JITed code contained RISC-V Compressed (C) Extension. This patch generalizes that to detect CPU features and enables testing on more RISC-V JIT work ahead. The second patch, which actually adds this support has been benchmarked on QEMU RISC-V and shows significant improvements. It was benchmarked using a simple loop inside a bpf program that ran bpf_get_current_task() and execution time was measured. It used bpf_prog_test_run_opts() to repeatedly trigger the BPF program. The loop ran in 1 second intervals and it kept firing bpf_prog_test_run_opts() as fast as possible until a second had elapsed and then reported statistics. Varun R Mallya (2): selftests/bpf: use host CPU features in JIT disassembler bpf, riscv: inline bpf_get_current_task() and bpf_get_current_task_btf() arch/riscv/net/bpf_jit_comp64.c | 9 +++++++++ tools/testing/selftests/bpf/jit_disasm_helpers.c | 13 +++++++++++-- .../selftests/bpf/progs/verifier_jit_inline.c | 2 ++ 3 files changed, 22 insertions(+), 2 deletions(-) -- 2.54.0