From patchwork Wed Aug 30 01:07:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 13369880 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D1B4136F for ; Wed, 30 Aug 2023 01:12:08 +0000 (UTC) Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61D3583 for ; Tue, 29 Aug 2023 18:12:07 -0700 (PDT) Received: from pps.filterd (m0360072.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 37U0mli5010919; Wed, 30 Aug 2023 01:11:53 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=UTejo2S13yFAR3z5TIjSuSkm6wxQiIH6AkzOHpiL6lM=; b=eKlFuS3cwYDsPL2sjG9Qnbw3qNjAdzj9YOJhdM3D4G5vf2sTLCbsWkjv1+hraWrz6naF WPGbf9pr1bE1OKEN27TjTbh/0JWaTA3y8b/0Aw+vonlMoBULC82028n8bYh1EA5s5MDp YewiIpoEQS1dONfofV2vFYaHk7ZdasxvkpV3+Ug96RFFmPEcwg3eMi+fLRRBqW2FzltY PMan1s0aZFOmt/uRNEh/c3CzPqO54bX+8/UPIvmBvhPPIb+zSae4Ph2/rgaU4BHaqVeE nLvRv+FAMyQYdZeSSuWNC3mWDfBWSnxqY2YKGXfpjohYyhEO+WT7Zg7gurcb+MZSe+zs PQ== Received: from ppma12.dal12v.mail.ibm.com (dc.9e.1632.ip4.static.sl-reverse.com [50.22.158.220]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3ssu0xgxsv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 30 Aug 2023 01:11:53 +0000 Received: from pps.filterd (ppma12.dal12v.mail.ibm.com [127.0.0.1]) by ppma12.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 37TNcgBG004928; Wed, 30 Aug 2023 01:11:52 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma12.dal12v.mail.ibm.com (PPS) with ESMTPS id 3squqsraee-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 30 Aug 2023 01:11:52 +0000 Received: from smtpav04.fra02v.mail.ibm.com (smtpav04.fra02v.mail.ibm.com [10.20.54.103]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 37U1Bnml44826978 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 30 Aug 2023 01:11:50 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D9DC020040; Wed, 30 Aug 2023 01:11:49 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 67AB52004B; Wed, 30 Aug 2023 01:11:49 +0000 (GMT) Received: from heavy.boeblingen.de.ibm.com (unknown [9.171.5.44]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 30 Aug 2023 01:11:49 +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 06/11] s390/bpf: Implement BPF_MEMSX Date: Wed, 30 Aug 2023 03:07:47 +0200 Message-ID: <20230830011128.1415752-7-iii@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230830011128.1415752-1-iii@linux.ibm.com> References: <20230830011128.1415752-1-iii@linux.ibm.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: q6JccSn4MhafjhMm8FildKgm-3yABrzo X-Proofpoint-ORIG-GUID: q6JccSn4MhafjhMm8FildKgm-3yABrzo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-08-29_16,2023-08-29_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 phishscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 mlxlogscore=999 spamscore=0 clxscore=1015 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2308100000 definitions=main-2308300008 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: bpf@iogearbox.net Implement the cpuv4 load with sign-extension, which is encoded as BPF_MEMSX (and, for internal uses cases only, BPF_PROBE_MEMSX). This is the same as BPF_MEM and BPF_PROBE_MEM, but with sign extension instead of zero extension, and s390x has the necessary instructions: lgb, lgh and lgf. Signed-off-by: Ilya Leoshkevich --- arch/s390/net/bpf_jit_comp.c | 32 +++++++++++++++++++++++++++----- 1 file changed, 27 insertions(+), 5 deletions(-) diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c index da6fb4669973..841c5f8ead15 100644 --- a/arch/s390/net/bpf_jit_comp.c +++ b/arch/s390/net/bpf_jit_comp.c @@ -670,15 +670,18 @@ static void bpf_jit_epilogue(struct bpf_jit *jit, u32 stack_depth) static int get_probe_mem_regno(const u8 *insn) { /* - * insn must point to llgc, llgh, llgf or lg, which have destination - * register at the same position. + * insn must point to llgc, llgh, llgf, lg, lgb, lgh or lgf, which have + * destination register at the same position. */ - if (insn[0] != 0xe3) /* common llgc, llgh, llgf and lg prefix */ + if (insn[0] != 0xe3) /* common prefix */ return -1; if (insn[5] != 0x90 && /* llgc */ insn[5] != 0x91 && /* llgh */ insn[5] != 0x16 && /* llgf */ - insn[5] != 0x04) /* lg */ + insn[5] != 0x04 && /* lg */ + insn[5] != 0x77 && /* lgb */ + insn[5] != 0x15 && /* lgh */ + insn[5] != 0x14) /* lgf */ return -1; return insn[1] >> 4; } @@ -788,7 +791,8 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, int err; if (BPF_CLASS(insn->code) == BPF_LDX && - BPF_MODE(insn->code) == BPF_PROBE_MEM) + (BPF_MODE(insn->code) == BPF_PROBE_MEM || + BPF_MODE(insn->code) == BPF_PROBE_MEMSX)) probe_prg = jit->prg; switch (insn->code) { @@ -1406,6 +1410,12 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, if (insn_is_zext(&insn[1])) insn_count = 2; break; + case BPF_LDX | BPF_MEMSX | BPF_B: /* dst = *(s8 *)(ul) (src + off) */ + case BPF_LDX | BPF_PROBE_MEMSX | BPF_B: + /* lgb %dst,0(off,%src) */ + EMIT6_DISP_LH(0xe3000000, 0x0077, dst_reg, src_reg, REG_0, off); + jit->seen |= SEEN_MEM; + break; case BPF_LDX | BPF_MEM | BPF_H: /* dst = *(u16 *)(ul) (src + off) */ case BPF_LDX | BPF_PROBE_MEM | BPF_H: /* llgh %dst,0(off,%src) */ @@ -1414,6 +1424,12 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, if (insn_is_zext(&insn[1])) insn_count = 2; break; + case BPF_LDX | BPF_MEMSX | BPF_H: /* dst = *(s16 *)(ul) (src + off) */ + case BPF_LDX | BPF_PROBE_MEMSX | BPF_H: + /* lgh %dst,0(off,%src) */ + EMIT6_DISP_LH(0xe3000000, 0x0015, dst_reg, src_reg, REG_0, off); + jit->seen |= SEEN_MEM; + break; case BPF_LDX | BPF_MEM | BPF_W: /* dst = *(u32 *)(ul) (src + off) */ case BPF_LDX | BPF_PROBE_MEM | BPF_W: /* llgf %dst,off(%src) */ @@ -1422,6 +1438,12 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp, if (insn_is_zext(&insn[1])) insn_count = 2; break; + case BPF_LDX | BPF_MEMSX | BPF_W: /* dst = *(s32 *)(ul) (src + off) */ + case BPF_LDX | BPF_PROBE_MEMSX | BPF_W: + /* lgf %dst,off(%src) */ + jit->seen |= SEEN_MEM; + EMIT6_DISP_LH(0xe3000000, 0x0014, dst_reg, src_reg, REG_0, off); + break; case BPF_LDX | BPF_MEM | BPF_DW: /* dst = *(u64 *)(ul) (src + off) */ case BPF_LDX | BPF_PROBE_MEM | BPF_DW: /* lg %dst,0(off,%src) */