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riscv, bpf: Optimize stack usage of trampoline

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When BPF_TRAMP_F_CALL_ORIG is not set, stack space for passing arguments
on stack doesn't need to be reserved because the original function is
not called.

Only reserve space for stacked arguments when BPF_TRAMP_F_CALL_ORIG is
set.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Pu Lehui <pulehui@huawei.com>
Link: https://lore.kernel.org/bpf/20240708114758.64414-1-puranjay@kernel.org
This commit is contained in:
Puranjay Mohan 2024-07-08 11:47:58 +00:00 committed by Daniel Borkmann
parent fd8db07705
commit a5912c37fa
1 changed files with 1 additions and 1 deletions
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2
arch/riscv/net/bpf_jit_comp64.c
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@ -892,7 +892,7 @@ static int __arch_prepare_bpf_trampoline(struct bpf_tramp_image *im,
stack_size += 8;
sreg_off = stack_size;
if (nr_arg_slots - RV_MAX_REG_ARGS > 0)
if ((flags & BPF_TRAMP_F_CALL_ORIG) && (nr_arg_slots - RV_MAX_REG_ARGS > 0))
stack_size += (nr_arg_slots - RV_MAX_REG_ARGS) * 8;
stack_size = round_up(stack_size, STACK_ALIGN);