From patchwork Sun Jan 29 19:04:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 13120220 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC8D7C05027 for ; Sun, 29 Jan 2023 19:05:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235152AbjA2TFg (ORCPT ); Sun, 29 Jan 2023 14:05:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55554 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231386AbjA2TFc (ORCPT ); Sun, 29 Jan 2023 14:05:32 -0500 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C594316339 for ; Sun, 29 Jan 2023 11:05:31 -0800 (PST) Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 30TDflLF014700; Sun, 29 Jan 2023 19:05:12 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=b14FwBP8CDrEEzbwvMX/y7yoA6BkN1AgjWD6umGP6a4=; b=tPefjJtc3iyeXyZ7MF0ZHaIl7gcpiiW4ClCGBIgdM8CnL/qu4W6v4JXKqBEir5c4rIta YH1CfRRVpZzz/3tMUJYSBzNn5wM4X48Pp5qozWj0noJI6jEMS7o/o7Ug4hmEJGt+4Rgj 96N9VS6kR9Isnq/dE1bo9EGzH8wGKa7syTpU2NLLBiGdxIwwHsBOD40cEmCKt1tX8Rl2 WsYhhWIe26Nw0EHF0Rukqgl07f7G8gv7069JexYyamr8x6hcbfDiCnRK9DEWVT6MZWiz vSZ2LaPlngdUOSKqaZsJ+EhaWBTek97IVogONRbBJhFItnofccgrBzWzgEYjqVjSqH8Q hg== Received: from ppma04ams.nl.ibm.com (63.31.33a9.ip4.static.sl-reverse.com [169.51.49.99]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3nddjmncc2-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 29 Jan 2023 19:05:12 +0000 Received: from pps.filterd (ppma04ams.nl.ibm.com [127.0.0.1]) by ppma04ams.nl.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 30T4vhFw026871; Sun, 29 Jan 2023 19:05:10 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma04ams.nl.ibm.com (PPS) with ESMTPS id 3ncvs7hd49-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sun, 29 Jan 2023 19:05:10 +0000 Received: from smtpav01.fra02v.mail.ibm.com (smtpav01.fra02v.mail.ibm.com [10.20.54.100]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 30TJ56c821430978 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 29 Jan 2023 19:05:06 GMT Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CEC3520043; Sun, 29 Jan 2023 19:05:06 +0000 (GMT) Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3E41120040; Sun, 29 Jan 2023 19:05:06 +0000 (GMT) Received: from heavy.ibmuc.com (unknown [9.179.11.57]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Sun, 29 Jan 2023 19:05:06 +0000 (GMT) From: Ilya Leoshkevich To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Ilya Leoshkevich Subject: [PATCH bpf-next v3 2/8] s390/bpf: Add expoline to tail calls Date: Sun, 29 Jan 2023 20:04:55 +0100 Message-Id: <20230129190501.1624747-3-iii@linux.ibm.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230129190501.1624747-1-iii@linux.ibm.com> References: <20230129190501.1624747-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: pHBlMNykuCbLwow1HIFn5otU7-ivYRhp X-Proofpoint-ORIG-GUID: pHBlMNykuCbLwow1HIFn5otU7-ivYRhp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.122.1 definitions=2023-01-29_10,2023-01-27_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 suspectscore=0 impostorscore=0 spamscore=0 phishscore=0 adultscore=0 clxscore=1015 mlxlogscore=999 bulkscore=0 malwarescore=0 lowpriorityscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2301290189 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net 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 --- arch/s390/net/bpf_jit_comp.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) 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) =