netdev - Re: [PATCH v4 bpf-next 3/4] selftests/bpf: make PT_REGS

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Message-ID: <CAEf4BzZ3-oA_h2YbpgUXnLoCL_6dj881rryizcUP=Kxf512-9A@mail.gmail.com>
Date:   Thu, 11 Jul 2019 17:49:21 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Ilya Leoshkevich <iii@...ux.ibm.com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Y Song <ys114321@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Stanislav Fomichev <sdf@...ichev.me>,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>
Subject: Re: [PATCH v4 bpf-next 3/4] selftests/bpf: make PT_REGS_* work in userspace

On Thu, Jul 11, 2019 at 7:31 AM Ilya Leoshkevich <iii@...ux.ibm.com> wrote:
>
> Right now, on certain architectures, these macros are usable only with
> kernel headers. This patch makes it possible to use them with userspace
> headers and, as a consequence, not only in BPF samples, but also in BPF
> selftests.
>
> On s390, provide the forward declaration of struct pt_regs and cast it
> to user_pt_regs in PT_REGS_* macros. This is necessary, because instead
> of the full struct pt_regs, s390 exposes only its first member
> user_pt_regs to userspace, and bpf_helpers.h is used with both userspace
> (in selftests) and kernel (in samples) headers. It was added in commit
> 466698e654e8 ("s390/bpf: correct broken uapi for
> BPF_PROG_TYPE_PERF_EVENT program type").
>
> Ditto on arm64.
>
> On x86, provide userspace versions of PT_REGS_* macros. Unlike s390 and
> arm64, x86 provides struct pt_regs to both userspace and kernel, however,
> with different member names.
>
> Signed-off-by: Ilya Leoshkevich <iii@...ux.ibm.com>
> ---

This is great, thanks!

Acked-by: Andrii Nakryiko <andriin@...com>



>  tools/testing/selftests/bpf/bpf_helpers.h | 75 +++++++++++++++++------
>  1 file changed, 55 insertions(+), 20 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/bpf_helpers.h b/tools/testing/selftests/bpf/bpf_helpers.h
> index 73071a94769a..27090d94afb6 100644

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