Allow mmap of /sys/kernel/btf/vmlinux #8976
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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. Tested-by: Alan Maguire <[email protected]> Signed-off-by: Lorenz Bauer <[email protected]> Reviewed-by: Shakeel Butt <[email protected]>
Add a basic test for the ability to mmap /sys/kernel/btf/vmlinux. Ensure that the data is valid BTF and that it is padded with zero. Tested-by: Alan Maguire <[email protected]> Signed-off-by: Lorenz Bauer <[email protected]>
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Teach libbpf to use mmap when parsing vmlinux BTF from /sys. We don't apply this to fall-back paths on the regular file system because there is no way to ensure that modifications underlying the MAP_PRIVATE mapping are not visible to the process. Acked-by: Andrii Nakryiko <[email protected]> Tested-by: Alan Maguire <[email protected]> Signed-off-by: Lorenz Bauer <[email protected]>
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Pull request for series with
subject: Allow mmap of /sys/kernel/btf/vmlinux
version: 5
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=964584