diff options
| author | Tony Ambardar <tony.ambardar@gmail.com> | 2022-06-17 12:57:34 +0200 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2022-06-21 18:52:04 +0200 |
| commit | 95acd8817e66d031d2e6ee7def3f1e1874819317 (patch) | |
| tree | f42808f3e806be15132e6978a1f2501eef59372b /include | |
| parent | b40b414ec8d971be0b2f6485c3a039b0fa7f078c (diff) | |
| download | linux-95acd8817e66d031d2e6ee7def3f1e1874819317.tar.bz2 | |
bpf, x64: Add predicate for bpf2bpf with tailcalls support in JIT
The BPF core/verifier is hard-coded to permit mixing bpf2bpf and tail
calls for only x86-64. Change the logic to instead rely on a new weak
function 'bool bpf_jit_supports_subprog_tailcalls(void)', which a capable
JIT backend can override.
Update the x86-64 eBPF JIT to reflect this.
Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com>
[jakub: drop MIPS bits and tweak patch subject]
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20220617105735.733938-2-jakub@cloudflare.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/filter.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index d0cbb31b1b4d..4c1a8b247545 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -914,6 +914,7 @@ u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog); void bpf_jit_compile(struct bpf_prog *prog); bool bpf_jit_needs_zext(void); +bool bpf_jit_supports_subprog_tailcalls(void); bool bpf_jit_supports_kfunc_call(void); bool bpf_helper_changes_pkt_data(void *func); |