Re: [PATCH bpf-next] LoongArch, bpf: Set bpf_jit_bypass_spec_v1/v4()

[Huacai Chen]

Queued for loongarch-next, thanks.


Huacai

On Tue, Jun 17, 2025 at 2:32 PM Tiezhu Yang <yangtiezhu@xxxxxxxxxxx> wrote:
>
> JITs can set bpf_jit_bypass_spec_v1/v4() if they want the verifier
> to skip analysis/patching for the respective vulnerability, it is
> safe to set both bpf_jit_bypass_spec_v1/v4(), because there is no
> speculation barrier instruction for LoongArch.
>
> Suggested-by: Luis Gerhorst <luis.gerhorst@xxxxxx>
> Signed-off-by: Tiezhu Yang <yangtiezhu@xxxxxxxxxxx>
> ---
>
> This is based on the latest bpf-next tree which contains the
> prototype and caller for bpf_jit_bypass_spec_v1/v4().
>
> By the way, it needs to update bpf-next tree before building
> on LoongArch:
>
> [Build Error Report] Implicit Function declaration for bpf-next tree
> https://lore.kernel.org/bpf/d602ae87-8bed-1633-d5b6-41c5bd8bbcdc@xxxxxxxxxxx/
>
>  arch/loongarch/net/bpf_jit.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
> index fa1500d4aa3e..5de8f4c44700 100644
> --- a/arch/loongarch/net/bpf_jit.c
> +++ b/arch/loongarch/net/bpf_jit.c
> @@ -1359,3 +1359,13 @@ bool bpf_jit_supports_subprog_tailcalls(void)
>  {
>         return true;
>  }
> +
> +bool bpf_jit_bypass_spec_v1(void)
> +{
> +       return true;
> +}
> +
> +bool bpf_jit_bypass_spec_v4(void)
> +{
> +       return true;
> +}
> --
> 2.42.0
>
>