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Date: Wed, 19 Jan 2022 22:49:42 +0800 From: Hou Tao <houtao1@...wei.com> To: Alexei Starovoitov <ast@...nel.org>, Ard Biesheuvel <ard.biesheuvel@....com> CC: Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>, Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, Zi Shen Lim <zlim.lnx@...il.com>, Will Deacon <will@...nel.org>, Catalin Marinas <catalin.marinas@....com>, <netdev@...r.kernel.org>, <bpf@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>, <houtao1@...wei.com> Subject: [PATCH bpf-next] bpf, arm64: enable kfunc call Since commit b2eed9b58811 ("arm64/kernel: kaslr: reduce module randomization range to 2 GB"), for arm64 whether KASLR is enabled or not, the module is placed within 2GB of the kernel region, so s32 in bpf_kfunc_desc is sufficient to represente the offset of module function relative to __bpf_call_base. The only thing needed is to override bpf_jit_supports_kfunc_call(). Signed-off-by: Hou Tao <houtao1@...wei.com> --- arch/arm64/net/bpf_jit_comp.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c index e96d4d87291f..74f9a9b6a053 100644 --- a/arch/arm64/net/bpf_jit_comp.c +++ b/arch/arm64/net/bpf_jit_comp.c @@ -1143,6 +1143,11 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog) return prog; } +bool bpf_jit_supports_kfunc_call(void) +{ + return true; +} + u64 bpf_jit_alloc_exec_limit(void) { return VMALLOC_END - VMALLOC_START; -- 2.27.0
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