Merge branch 'risc-v-jit-support-for-bpf_get_current_task-_btf'

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Varun R Mallya says:

====================
RISC-V JIT support for bpf_get_current_task/_btf

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.
====================

Link: https://patch.msgid.link/20260602205847.102825-1-varunrmallya@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Alexei Starovoitov 2026-06-05 15:26:18 -07:00

parent a1f1acf6a1 6d13ddb1d4

commit b984529052

3 changed files with 22 additions and 2 deletions

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9

arch/riscv/net/bpf_jit_comp64.c

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13

tools/testing/selftests/bpf/jit_disasm_helpers.c

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2

tools/testing/selftests/bpf/progs/verifier_jit_inline.c

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