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Tue, 10 Nov 2020 20:24:32 +0000 From: Song Liu To: Andrii Nakryiko CC: bpf , Networking , "Alexei Starovoitov" , "daniel@iogearbox.net" , Kernel Team , "linux-kernel@vger.kernel.org" , "rafael@kernel.org" , "jeyu@kernel.org" , Arnaldo Carvalho de Melo , Greg Kroah-Hartman Subject: Re: [PATCH v4 bpf-next 2/5] bpf: assign ID to vmlinux BTF and return extra info for BTF in GET_OBJ_INFO Thread-Topic: [PATCH v4 bpf-next 2/5] bpf: assign ID to vmlinux BTF and return extra info for BTF in GET_OBJ_INFO Thread-Index: AQHWtwAGZmszHy7p70yAdAMsxZarMKnB0P2A Date: Tue, 10 Nov 2020 20:24:32 +0000 Message-ID: References: <20201110011932.3201430-1-andrii@kernel.org> <20201110011932.3201430-3-andrii@kernel.org> In-Reply-To: <20201110011932.3201430-3-andrii@kernel.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3608.120.23.2.4) authentication-results: kernel.org; dkim=none (message not signed) header.d=none;kernel.org; dmarc=none action=none header.from=fb.com; 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charset="us-ascii" Content-ID: <5D3C524128F06645BFD6F6AAE598AFB3@namprd15.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR15MB2999.namprd15.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9a98e30a-526e-468e-f760-08d885b6a214 X-MS-Exchange-CrossTenant-originalarrivaltime: 10 Nov 2020 20:24:32.2170 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: mp+6uVuEIDbqn+dH8Jr2vFko714jRkWuEyBrmiuWHlenM9VaFWpxHCiINuLcNUO3uIhdafCx3okvCaOsd0zNLg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR15MB2197 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-11-10_07:2020-11-10,2020-11-10 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 clxscore=1015 suspectscore=0 lowpriorityscore=0 malwarescore=0 adultscore=0 phishscore=0 bulkscore=0 mlxscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=695 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011100138 X-FB-Internal: deliver Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org > On Nov 9, 2020, at 5:19 PM, Andrii Nakryiko wrote: >=20 > Allocate ID for vmlinux BTF. This makes it visible when iterating over al= l BTF > objects in the system. To allow distinguishing vmlinux BTF (and later ker= nel > module BTF) from user-provided BTFs, expose extra kernel_btf flag, as wel= l as > BTF name ("vmlinux" for vmlinux BTF, will equal to module's name for modu= le > BTF). We might want to later allow specifying BTF name for user-provided= BTFs > as well, if that makes sense. But currently this is reserved only for > in-kernel BTFs. >=20 > Having in-kernel BTFs exposed IDs will allow to extend BPF APIs that requ= ire > in-kernel BTF type with ability to specify BTF types from kernel modules,= not > just vmlinux BTF. This will be implemented in a follow up patch set for > fentry/fexit/fmod_ret/lsm/etc. >=20 > Signed-off-by: Andrii Nakryiko Acked-by: Song Liu