From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Andrii Nakryiko <andrii@kernel.org>
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org, ast@fb.com,
daniel@iogearbox.net, kernel-team@fb.com,
linux-kernel@vger.kernel.org, rafael@kernel.org, jeyu@kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [PATCH v2 bpf-next 4/5] bpf: load and verify kernel module BTFs
Date: Sat, 7 Nov 2020 15:09:01 +0100 [thread overview]
Message-ID: <20201107140901.GA28983@kroah.com> (raw)
In-Reply-To: <20201106230228.2202-5-andrii@kernel.org>
On Fri, Nov 06, 2020 at 03:02:27PM -0800, Andrii Nakryiko wrote:
> Add kernel module listener that will load/validate and unload module BTF.
> Module BTFs gets ID generated for them, which makes it possible to iterate
> them with existing BTF iteration API. They are given their respective module's
> names, which will get reported through GET_OBJ_INFO API. They are also marked
> as in-kernel BTFs for tooling to distinguish them from user-provided BTFs.
>
> Also, similarly to vmlinux BTF, kernel module BTFs are exposed through
> sysfs as /sys/kernel/btf/<module-name>. This is convenient for user-space
> tools to inspect module BTF contents and dump their types with existing tools:
>
> [vmuser@archvm bpf]$ ls -la /sys/kernel/btf
> total 0
> drwxr-xr-x 2 root root 0 Nov 4 19:46 .
> drwxr-xr-x 13 root root 0 Nov 4 19:46 ..
>
> ...
>
> -r--r--r-- 1 root root 888 Nov 4 19:46 irqbypass
> -r--r--r-- 1 root root 100225 Nov 4 19:46 kvm
> -r--r--r-- 1 root root 35401 Nov 4 19:46 kvm_intel
> -r--r--r-- 1 root root 120 Nov 4 19:46 pcspkr
> -r--r--r-- 1 root root 399 Nov 4 19:46 serio_raw
> -r--r--r-- 1 root root 4094095 Nov 4 19:46 vmlinux
>
> Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
> ---
> Documentation/ABI/testing/sysfs-kernel-btf | 8 +
> include/linux/bpf.h | 2 +
> include/linux/module.h | 4 +
> kernel/bpf/btf.c | 194 +++++++++++++++++++++
> kernel/bpf/sysfs_btf.c | 2 +-
> kernel/module.c | 32 ++++
> 6 files changed, 241 insertions(+), 1 deletion(-)
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
next prev parent reply other threads:[~2020-11-07 14:09 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-06 23:02 [PATCH v2 bpf-next 0/5] Integrate kernel module BTF support Andrii Nakryiko
2020-11-06 23:02 ` [PATCH v2 bpf-next 1/5] bpf: add in-kernel split " Andrii Nakryiko
2020-11-07 1:27 ` Song Liu
2020-11-07 1:51 ` Andrii Nakryiko
2020-11-06 23:02 ` [PATCH v2 bpf-next 2/5] bpf: assign ID to vmlinux BTF and return extra info for BTF in GET_OBJ_INFO Andrii Nakryiko
2020-11-06 23:02 ` [PATCH v2 bpf-next 4/5] bpf: load and verify kernel module BTFs Andrii Nakryiko
2020-11-07 14:09 ` Greg Kroah-Hartman [this message]
2020-11-06 23:02 ` [PATCH v2 bpf-next 5/5] tools/bpftool: add support for in-kernel and named BTF in `btf show` Andrii Nakryiko
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