Messages in this thread Patch in this message | | | From | George Guo <> | Subject | [PATCH] loongarch/bpf: Fix bpf load failed with CONFIG_BPF_JIT_ALWAYS_ON, caused by jit (BPF_ST | BPF_NOSPEC) code | Date | Sun, 26 Mar 2023 12:40:19 +0800 |
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Here just skip the code(BPF_ST | BPF_NOSPEC) that has no couterpart to the loongarch.
To verify, use ltp testcase:
Without this patch: $ ./bpf_prog02 ... ... bpf_common.c:123: TBROK: Failed verification: ??? (524)
Summary: passed 0 failed 0 broken 1 skipped 0 warnings 0
With this patch: $ ./bpf_prog02 ... ... Summary: passed 0 failed 0 broken 0 skipped 0 warnings 0
Signed-off-by: George Guo <guodongtai@kylinos.cn> --- arch/loongarch/net/bpf_jit.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c index 288003a9f0ca..745d344385ed 100644 --- a/arch/loongarch/net/bpf_jit.c +++ b/arch/loongarch/net/bpf_jit.c @@ -1046,6 +1046,11 @@ static int build_body(struct jit_ctx *ctx, bool extra_pass) if (ctx->image == NULL) ctx->offset[i] = ctx->idx; + /* skip the code that has no couterpart to the host arch */ + if(insn->code == (BPF_ST | BPF_NOSPEC)) { + continue; + } + ret = build_insn(insn, ctx, extra_pass); if (ret > 0) { i++; -- 2.34.1
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