LoongArch: BPF: Resolve per-CPU addrs for internal-only MOV

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Add support for the internal-only BPF_MOV instruction that resolves the
absolute addresses of the per-CPU data from their per-CPU offsets. This
instruction is used only for internal inlining optimizations between the
BPF verifier and the JITs (e.g. inlining bpf_get_smp_processor_id() and
per-CPU map lookups).

LoongArch keeps the per-CPU offset of the current CPU in $r21 register
(a.k.a. __my_cpu_offset), so resolving a per-CPU address only requires
adding $r21 to the source register holding the per-CPU offset. Advertise
the capability via bpf_jit_supports_percpu_insn().

Acked-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Tested-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: George Guo <guodongtai@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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George Guo 2026-08-17 22:07:40 +08:00 • committed by Huacai Chen

parent 1fec6bbc09

commit 1db6d003e9

2 changed files with 15 additions and 0 deletions

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1

arch/loongarch/include/asm/inst.h

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14

arch/loongarch/net/bpf_jit.c

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