From:   Pu Lehui <pulehui@huaweicloud.com>
To:     bpf@vger.kernel.org, linux-riscv@lists.infradead.org,
        linux-kernel@vger.kernel.org
Cc:     =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= <bjorn@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Martin KaFai Lau <martin.lau@linux.dev>,
        Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>,
        Stanislav Fomichev <sdf@google.com>,
        Hao Luo <haoluo@google.com>, Jiri Olsa <jolsa@kernel.org>,
        Pu Lehui <pulehui@huawei.com>,
        Pu Lehui <pulehui@huaweicloud.com>
Subject: [PATCH bpf-next] riscv, bpf: Add kfunc support for RV64
Date:   Mon, 20 Feb 2023 15:13:21 +0800
Message-Id: <20230220071321.2906034-1-pulehui@huaweicloud.com>
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Precedence: bulk

As another important missing piece of RV64 JIT, kfunc allow bpf programs
call kernel functions. For now, RV64 is sufficient to enable it.

Suggested-by: Björn Töpel <bjorn@rivosinc.com>
Signed-off-by: Pu Lehui <pulehui@huawei.com>
---
 arch/riscv/net/bpf_jit_comp64.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index f5a668736c79..a9270366dc57 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -1751,3 +1751,8 @@ void bpf_jit_build_epilogue(struct rv_jit_context *ctx)
 {
 	__build_epilogue(false, ctx);
 }
+
+bool bpf_jit_supports_kfunc_call(void)
+{
+	return true;
+}
-- 
2.25.1