Allow mmap of /sys/kernel/btf/vmlinux#8976
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kernel-patches-daemon-bpf[bot] wants to merge 4 commits intobpf-next_basefrom
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Allow mmap of /sys/kernel/btf/vmlinux#8976kernel-patches-daemon-bpf[bot] wants to merge 4 commits intobpf-next_basefrom
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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 <alan.maguire@oracle.com> Signed-off-by: Lorenz Bauer <lmb@isovalent.com> Reviewed-by: Shakeel Butt <shakeel.butt@linux.dev>
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 <alan.maguire@oracle.com> Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
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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 <andrii@kernel.org> Tested-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Lorenz Bauer <lmb@isovalent.com>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=964584 irrelevant now. Closing PR. |
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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