From patchwork Thu Jun 29 08:32:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ilya Leoshkevich X-Patchwork-Id: 114251 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:994d:0:b0:3d9:f83d:47d9 with SMTP id k13csp9501425vqr; Thu, 29 Jun 2023 02:16:23 -0700 (PDT) X-Google-Smtp-Source: ACHHUZ6D8vJfkW84D3U2kZid2QjJmoTFiWwFqXyww6k73ZQ9jr2ufd2DUGth0rQNNk5YmVann7PW X-Received: by 2002:a17:902:ecc6:b0:1ae:1364:6086 with SMTP id a6-20020a170902ecc600b001ae13646086mr45047145plh.2.1688030183326; Thu, 29 Jun 2023 02:16:23 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1688030183; cv=none; d=google.com; s=arc-20160816; b=z/daRNllXm2kZ1FSRn9ccyu36ZaEoGqhslA79iHFtvXBKPE1KsMPfBZ4rGhRPPEEaZ 878OmWIuPVxPU3GGGJ65bCpBq1RDcAGLvelJrjY9mDSAhzwTb9V4JqeHTIWCbGyOBGX4 QEybxGbFbI0d6dqcasPyaWWbejwG/KIn/yd77+f3NWkW4U9MdR+7mpEHfb8bxowBEfns 6r2zr2Q8BmpO39CSMnoswXp/yLEKbDpVuJSqRSKyFi+5Q6V1QHPIio4SitYjoFWxPYhL YNeCL/Ifs/YhukOPlmJ+aOBAPwRo5NmOdmQF1Wde8bo1lz/N4soavS4bbuoS5Pj/RyM5 vfhw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=Y/QK5ZDlZiai1RQOWkH9EXksqAPhidIxr7VNx6JZeGA=; fh=gHcTkaRruKuCoNKJrhDWrp4+Ah5F5Oad2CKpxX1Lrts=; b=wSbvK7v/8MK20MOuZJ0MeO5Zhvx42GfJ3Ao21lISdrT0ByEXauVdAg+TGSrRjvYoWb BngJJagXTI8OFwx/jrqamxzdL2Up7eSXw5/gao3F+s95QwtaEiE26Zc6vcrefY/A+bl3 01lu60ixZGVX3go5BV/gKUWR5IIOM9mDxXBbqYqOhzcZlXnMHw7JqWPzZn3rrguUFxFF TwZnul70qGamygGqCbkrj8B2670KsmfnJszQtp0modvleDYh+sRXBYmqMXQHhlJ50AuY AnzqwgT7QKh9bI7VdLMotvVEu/lS7eFVV1p4vf5v4OXVs6L0aaDgkBx6u7RaIcSF2WGy qXQQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@ibm.com header.s=pp1 header.b=VkmoaDnn; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=NONE dis=NONE) header.from=ibm.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id x3-20020a170902b40300b001b668bb6ac8si9946923plr.447.2023.06.29.02.16.11; Thu, 29 Jun 2023 02:16:23 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@ibm.com header.s=pp1 header.b=VkmoaDnn; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=NONE dis=NONE) header.from=ibm.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230487AbjF2IlX (ORCPT + 99 others); Thu, 29 Jun 2023 04:41:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52444 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230181AbjF2Ik2 (ORCPT ); Thu, 29 Jun 2023 04:40:28 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A108D3AA7; Thu, 29 Jun 2023 01:35:09 -0700 (PDT) Received: from pps.filterd (m0353727.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 35T8GkEc026597; Thu, 29 Jun 2023 08:35:09 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=Y/QK5ZDlZiai1RQOWkH9EXksqAPhidIxr7VNx6JZeGA=; b=VkmoaDnn02lb98j4cPYdX1TIvBisDySYxvWSSWdNLluKUIRXvRNDxcHpgqSVFwS02ICU 7In6VKSjpqa9IX6Ezsw604eLr2v1UqLIP+KIFFtdFTj0KL0xtb7jY1QWQ9/AjBnL3JW5 gI32XrIonP6akJeArscutBgc34wXHo+C+/TUubRHXeQyuCkTEH4JCqJH3wtNX1GU/+FA 3kLCM3FRwU3ht3O14oGCLZ6houkpgFpN3zgEvjq9gndbGJRwzUkyinHZM6VqkCPZp1yX wwjVIiZC+yzygpDJLiYSGrFohtZ/KqKL7vGw40ZpFzqYxEhazHFhqYDB8KcwwZ7bg4p5 aQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3rh6ab0bsr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 29 Jun 2023 08:35:09 +0000 Received: from m0353727.ppops.net (m0353727.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 35T8H9SV028816; Thu, 29 Jun 2023 08:35:08 GMT Received: from ppma06ams.nl.ibm.com (66.31.33a9.ip4.static.sl-reverse.com [169.51.49.102]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3rh6ab0bry-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 29 Jun 2023 08:35:08 +0000 Received: from pps.filterd (ppma06ams.nl.ibm.com [127.0.0.1]) by ppma06ams.nl.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 35T1Kwof004994; Thu, 29 Jun 2023 08:35:06 GMT Received: from smtprelay05.fra02v.mail.ibm.com ([9.218.2.225]) by ppma06ams.nl.ibm.com (PPS) with ESMTPS id 3rdqre38bq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 29 Jun 2023 08:35:06 +0000 Received: from smtpav07.fra02v.mail.ibm.com (smtpav07.fra02v.mail.ibm.com [10.20.54.106]) by smtprelay05.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 35T8Z1IT14811898 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 29 Jun 2023 08:35:01 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BB80C20040; Thu, 29 Jun 2023 08:35:01 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D56702004B; Thu, 29 Jun 2023 08:35:00 +0000 (GMT) Received: from heavy.boeblingen.de.ibm.com (unknown [9.179.0.51]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 29 Jun 2023 08:35:00 +0000 (GMT) From: Ilya Leoshkevich To: Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Cc: David Hildenbrand , Sven Schnelle , kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Jens Freimann , Ilya Leoshkevich Subject: [PATCH 1/2] KVM: s390: interrupt: Fix stepping into interrupt handlers Date: Thu, 29 Jun 2023 10:32:04 +0200 Message-ID: <20230629083452.183274-2-iii@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230629083452.183274-1-iii@linux.ibm.com> References: <20230629083452.183274-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 7gtpBV6AK1LPLqycyqoLLB7RKgXgIuqx X-Proofpoint-ORIG-GUID: C3P-kw2c-x-FDFipZo0X-b1e1TLHrTIo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-28_14,2023-06-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 phishscore=0 mlxlogscore=999 malwarescore=0 priorityscore=1501 mlxscore=0 clxscore=1015 suspectscore=0 impostorscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306290075 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1770027937389996742?= X-GMAIL-MSGID: =?utf-8?q?1770027937389996742?= Currently, after single-stepping an instruction that causes a program interrupt, GDB ends up on the second instruction of the program interrupt handler. The reason is that vcpu_pre_run() manually delivers the program interrupt, and then __vcpu_run() runs the first handler instruction using the CPUSTAT_P flag. This causes a KVM_SINGLESTEP exit on the second handler instruction. Instead, KVM needs to do a KVM_SINGLESTEP exit after the manual interrupt delivery. Signed-off-by: Ilya Leoshkevich --- arch/s390/kvm/interrupt.c | 10 ++++++++++ arch/s390/kvm/kvm-s390.c | 4 ++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 9250fde1f97d..e633ec4f98d8 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -1392,6 +1392,7 @@ int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) { struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; int rc = 0; + bool delivered = false; unsigned long irq_type; unsigned long irqs; @@ -1465,6 +1466,15 @@ int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu) WARN_ONCE(1, "Unknown pending irq type %ld", irq_type); clear_bit(irq_type, &li->pending_irqs); } + delivered |= !rc; + } + + if (delivered && guestdbg_sstep_enabled(vcpu)) { + struct kvm_debug_exit_arch *debug_exit = &vcpu->run->debug.arch; + + debug_exit->addr = vcpu->arch.sie_block->gpsw.addr; + debug_exit->type = KVM_SINGLESTEP; + vcpu->guest_debug |= KVM_GUESTDBG_EXIT_PENDING; } set_intercept_indicators(vcpu); diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 39b36562c043..2d66d83b682c 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -4607,7 +4607,7 @@ static int vcpu_pre_run(struct kvm_vcpu *vcpu) if (!kvm_is_ucontrol(vcpu->kvm)) { rc = kvm_s390_deliver_pending_interrupts(vcpu); - if (rc) + if (rc || guestdbg_exit_pending(vcpu)) return rc; } @@ -4734,7 +4734,7 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) do { rc = vcpu_pre_run(vcpu); - if (rc) + if (rc || guestdbg_exit_pending(vcpu)) break; kvm_vcpu_srcu_read_unlock(vcpu);