diff mbox series

[bpf-next,v2,27/31] s390/bpf: Add expoline to tail calls

Message ID 20230128000650.1516334-28-iii@linux.ibm.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Support bpf trampoline for s390x | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count fail Series longer than 15 patches (and no cover letter)
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers fail 1 blamed authors not CCed: schwidefsky@de.ibm.com; 12 maintainers not CCed: sdf@google.com kpsingh@kernel.org jolsa@kernel.org borntraeger@linux.ibm.com schwidefsky@de.ibm.com martin.lau@linux.dev svens@linux.ibm.com song@kernel.org john.fastabend@gmail.com linux-s390@vger.kernel.org haoluo@google.com yhs@fb.com
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 18 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
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Commit Message

Ilya Leoshkevich Jan. 28, 2023, 12:06 a.m. UTC 
All the indirect jumps in the eBPF JIT already use expolines, except
for the tail call one.

Fixes: de5cb6eb514e ("s390: use expoline thunks in the BPF JIT")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 arch/s390/net/bpf_jit_comp.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index eb1a78c0e6a8..8400a06c926e 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -1393,8 +1393,16 @@  static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
 		/* lg %r1,bpf_func(%r1) */
 		EMIT6_DISP_LH(0xe3000000, 0x0004, REG_1, REG_1, REG_0,
 			      offsetof(struct bpf_prog, bpf_func));
-		/* bc 0xf,tail_call_start(%r1) */
-		_EMIT4(0x47f01000 + jit->tail_call_start);
+		if (nospec_uses_trampoline()) {
+			jit->seen |= SEEN_FUNC;
+			/* aghi %r1,tail_call_start */
+			EMIT4_IMM(0xa70b0000, REG_1, jit->tail_call_start);
+			/* brcl 0xf,__s390_indirect_jump_r1 */
+			EMIT6_PCREL_RILC(0xc0040000, 0xf, jit->r1_thunk_ip);
+		} else {
+			/* bc 0xf,tail_call_start(%r1) */
+			_EMIT4(0x47f01000 + jit->tail_call_start);
+		}
 		/* out: */
 		if (jit->prg_buf) {
 			*(u16 *)(jit->prg_buf + patch_1_clrj + 2) =