riscv, bpf: Provide RISC-V specific JIT image alloc/free

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This commit makes sure that the JIT images is kept close to the kernel
text, so BPF calls can use relative calling with auipc/jalr or jal
instead of loading the full 64-bit address and jalr.

The BPF JIT image region is 128 MB before the kernel text.

Signed-off-by: Björn Töpel <bjorn.topel@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20191216091343.23260-7-bjorn.topel@gmail.com

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Björn Töpel 2019-12-16 10:13:40 +01:00 • committed by Daniel Borkmann

parent fe8322b866

commit 7f3631e88e

2 changed files with 17 additions and 0 deletions

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4

arch/riscv/include/asm/pgtable.h

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13

arch/riscv/net/bpf_jit_comp.c

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