linux-kernel - Re: [PATCH v3 1/3] bpf: define bpf_jit_alloc_exec

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Message-ID: <CAJ+HfNjwYtg+8ZWBNaL08afQJpOQ6m0tUiTjhTtLBBoLDdxAmg@mail.gmail.com>
Date:   Mon, 18 Oct 2021 08:14:59 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     Lorenz Bauer <lmb@...udflare.com>
Cc:     nicolas.dichtel@...nd.com, Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, kernel-team@...udflare.com,
        Netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] bpf: define bpf_jit_alloc_exec_limit for riscv JIT

On Thu, 14 Oct 2021 at 16:26, Lorenz Bauer <lmb@...udflare.com> wrote:
>
> Expose the maximum amount of useable memory from the riscv JIT.
>
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> Acked-by: Luke Nelson <luke.r.nels@...il.com>

Acked-by: Björn Töpel <bjorn@...nel.org>

> ---
>  arch/riscv/net/bpf_jit_core.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/riscv/net/bpf_jit_core.c b/arch/riscv/net/bpf_jit_core.c
> index fed86f42dfbe..0fee2cbaaf53 100644
> --- a/arch/riscv/net/bpf_jit_core.c
> +++ b/arch/riscv/net/bpf_jit_core.c
> @@ -166,6 +166,11 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
>         return prog;
>  }
>
> +u64 bpf_jit_alloc_exec_limit(void)
> +{
> +       return BPF_JIT_REGION_SIZE;
> +}
> +
>  void *bpf_jit_alloc_exec(unsigned long size)
>  {
>         return __vmalloc_node_range(size, PAGE_SIZE, BPF_JIT_REGION_START,
> --
> 2.30.2
>