btf: Allow mmap of vmlinux btf

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User space needs access to kernel BTF for many modern features of BPF.
Right now each process needs to read the BTF blob either in pieces or
as a whole. Allow mmaping the sysfs file so that processes can directly
access the memory allocated for it in the kernel.

remap_pfn_range is used instead of vm_insert_page due to aarch64
compatibility issues.

Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Alan Maguire <alan.maguire@oracle.com>
Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
Link: https://lore.kernel.org/bpf/20250520-vmlinux-mmap-v5-1-e8c941acc414@isovalent.com

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Lorenz Bauer 2025-05-20 14:01:17 +01:00 • committed by Andrii Nakryiko

parent 8259eb0e06

commit a539e2a6d5

2 changed files with 34 additions and 1 deletions

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3

include/asm-generic/vmlinux.lds.h

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32

kernel/bpf/sysfs_btf.c

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