Message ID | 20230928194818.261163-4-hbathini@linux.ibm.com (mailing list archive) |
---|---|
State | Superseded, archived |
Headers | show |
Series | powerpc/bpf: use BPF prog pack allocator | expand |
On Thu, Sep 28, 2023 at 12:49 PM Hari Bathini <hbathini@linux.ibm.com> wrote: > > Implement bpf_arch_text_invalidate and use it to fill unused part of > the bpf_prog_pack with trap instructions when a BPF program is freed. > > Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Acked-by: Song Liu <song@kernel.org>
diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c index c740eac8d584..ecd7cffbbe28 100644 --- a/arch/powerpc/net/bpf_jit_comp.c +++ b/arch/powerpc/net/bpf_jit_comp.c @@ -292,3 +292,18 @@ void *bpf_arch_text_copy(void *dst, void *src, size_t len) return err ? ERR_PTR(err) : dst; } + +int bpf_arch_text_invalidate(void *dst, size_t len) +{ + u32 insn = BREAKPOINT_INSTRUCTION; + int ret; + + if (WARN_ON_ONCE(core_kernel_text((unsigned long)dst))) + return -EINVAL; + + mutex_lock(&text_mutex); + ret = patch_instructions(dst, &insn, len, true); + mutex_unlock(&text_mutex); + + return ret; +}
Implement bpf_arch_text_invalidate and use it to fill unused part of the bpf_prog_pack with trap instructions when a BPF program is freed. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> --- arch/powerpc/net/bpf_jit_comp.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)