* [PATCH bpf-next 2/4] bpf: define bpf_jit_alloc_exec_limit for arm64 JIT
[not found] <20210924095542.33697-1-lmb@cloudflare.com>
@ 2021-09-24 9:55 ` Lorenz Bauer
2021-09-29 16:18 ` Will Deacon
0 siblings, 1 reply; 2+ messages in thread
From: Lorenz Bauer @ 2021-09-24 9:55 UTC (permalink / raw)
To: Daniel Borkmann, Alexei Starovoitov, Zi Shen Lim, Catalin Marinas,
Will Deacon, Andrii Nakryiko
Cc: kernel-team, Lorenz Bauer, netdev, bpf, linux-arm-kernel,
linux-kernel
Expose the maximum amount of useable memory from the arm64 JIT.
Signed-off-by: Lorenz Bauer <lmb@cloudflare.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 41c23f474ea6..803e7773fa86 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -1136,6 +1136,11 @@ 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
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH bpf-next 2/4] bpf: define bpf_jit_alloc_exec_limit for arm64 JIT
2021-09-24 9:55 ` [PATCH bpf-next 2/4] bpf: define bpf_jit_alloc_exec_limit for arm64 JIT Lorenz Bauer
@ 2021-09-29 16:18 ` Will Deacon
0 siblings, 0 replies; 2+ messages in thread
From: Will Deacon @ 2021-09-29 16:18 UTC (permalink / raw)
To: Lorenz Bauer
Cc: Daniel Borkmann, Alexei Starovoitov, Zi Shen Lim, Catalin Marinas,
Andrii Nakryiko, kernel-team, netdev, bpf, linux-arm-kernel,
linux-kernel
On Fri, Sep 24, 2021 at 10:55:40AM +0100, Lorenz Bauer wrote:
> Expose the maximum amount of useable memory from the arm64 JIT.
>
> Signed-off-by: Lorenz Bauer <lmb@cloudflare.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 41c23f474ea6..803e7773fa86 100644
> --- a/arch/arm64/net/bpf_jit_comp.c
> +++ b/arch/arm64/net/bpf_jit_comp.c
> @@ -1136,6 +1136,11 @@ 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;
> +}
Looks like this won't result in a functional change, as we happen to return
SZ_128M anyway thanks to the way in which the modules area is constructed.
But making this explicit is definitely better, so:
Acked-by: Will Deacon <will@kernel.org>
(I'm assuming this will go via the bpf tree, but please shout if I should
take it via arm64 instead)
Will
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2021-09-24 9:55 ` [PATCH bpf-next 2/4] bpf: define bpf_jit_alloc_exec_limit for arm64 JIT Lorenz Bauer
2021-09-29 16:18 ` Will Deacon
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