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[bpf-next,v2,4/5] bpf: allow bpf_fastcall for bpf_cast_to_kern_ctx and bpf_rdonly_cast

Message ID 20240817015140.1039351-5-eddyz87@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series support bpf_fastcall patterns for calls to kfuncs | expand

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Commit Message

Eduard Zingerman Aug. 17, 2024, 1:51 a.m. UTC 
do_misc_fixups() relaces bpf_cast_to_kern_ctx() and bpf_rdonly_cast()
by a single instruction "r0 = r1". This follows bpf_fastcall contract.
This commit allows bpf_fastcall pattern rewrite for these two
functions in order to use them in bpf_fastcall selftests.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
---
 kernel/bpf/verifier.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Yonghong Song Aug. 22, 2024, 1:23 a.m. UTC | #1 
On 8/16/24 6:51 PM, Eduard Zingerman wrote:
> do_misc_fixups() relaces bpf_cast_to_kern_ctx() and bpf_rdonly_cast()
> by a single instruction "r0 = r1". This follows bpf_fastcall contract.
> This commit allows bpf_fastcall pattern rewrite for these two
> functions in order to use them in bpf_fastcall selftests.
>
> Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
diff mbox series

Patch

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 5dafcfff729e..720163772719 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -16159,6 +16159,9 @@  static u32 kfunc_fastcall_clobber_mask(struct bpf_kfunc_call_arg_meta *meta)
 /* Same as verifier_inlines_helper_call() but for kfuncs, see comment above */
 static bool is_fastcall_kfunc_call(struct bpf_kfunc_call_arg_meta *meta)
 {
+	if (meta->btf == btf_vmlinux)
+		return meta->func_id == special_kfunc_list[KF_bpf_cast_to_kern_ctx] ||
+		       meta->func_id == special_kfunc_list[KF_bpf_rdonly_cast];
 	return false;
 }