From patchwork Tue Feb 8 16:53:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Mueller X-Patchwork-Id: 12739014 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 72BA8C433F5 for ; Tue, 8 Feb 2022 16:53:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383577AbiBHQxl (ORCPT ); Tue, 8 Feb 2022 11:53:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36886 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383570AbiBHQxk (ORCPT ); Tue, 8 Feb 2022 11:53:40 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 270BDC061576; Tue, 8 Feb 2022 08:53:38 -0800 (PST) Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 218F14Cj007808; Tue, 8 Feb 2022 16:53:38 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=aoxEDXIlXCRhZYMjxMiW18cl8LWBJsTwGu5XEkL/YUM=; b=OjHbqkncvslF2XCxAQXlSoSE3ZS9WmyoCuev/zlB1lVDPcD6uRBFE8cQmj02lNGyFUX1 tK+aCu4YYZ3u80A4beeP/1kAoeem6hlKgdEMtyT9tz0HA5lWBtc5qHwamo0X0W1gKVhB y7C6/XLYKv/5NyhqQVW7KHOzCFMP5Y/rX0+i0GcDctcHJUTrTl2I9qTDfsUUrSu3Pf3C vHLF7h6pt+OJYpxuZcoxtvJpusykA4vbCqrDomdA02saTrhbLptCfeL89vfsswJavB5l GflCHyy7x1vMzuPB8Al+DVnI7nIPTx0gSPEjc+5bb4VPF5NNcSjEFsVNLCkB4BpOeELO XQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3e3tssv50a-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 08 Feb 2022 16:53:38 +0000 Received: from m0098399.ppops.net (m0098399.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 218GUZXY015068; Tue, 8 Feb 2022 16:53:37 GMT Received: from ppma05fra.de.ibm.com (6c.4a.5195.ip4.static.sl-reverse.com [149.81.74.108]) by mx0a-001b2d01.pphosted.com with ESMTP id 3e3tssv4ye-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 08 Feb 2022 16:53:37 +0000 Received: from pps.filterd (ppma05fra.de.ibm.com [127.0.0.1]) by ppma05fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 218GX4Jl005502; Tue, 8 Feb 2022 16:53:35 GMT Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by ppma05fra.de.ibm.com with ESMTP id 3e1gva6rpv-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 08 Feb 2022 16:53:35 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 218GrV8g32964866 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 8 Feb 2022 16:53:31 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 270B94C044; Tue, 8 Feb 2022 16:53:31 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CE7AB4C058; Tue, 8 Feb 2022 16:53:30 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 8 Feb 2022 16:53:30 +0000 (GMT) From: Michael Mueller To: kvm@vger.kernel.org Cc: cohuck@redhat.com, borntraeger@de.ibm.com, frankja@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com, david@redhat.com, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Mueller Subject: [PATCH v2 1/1] KVM: s390: pv: make use of ultravisor AIV support Date: Tue, 8 Feb 2022 17:53:10 +0100 Message-Id: <20220208165310.3905815-2-mimu@linux.ibm.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220208165310.3905815-1-mimu@linux.ibm.com> References: <20220208165310.3905815-1-mimu@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: 6IRySVlChVro9QgIjEPX3EAZZPzd62QG X-Proofpoint-GUID: NETqMueoJWwEYz1ZBwSJPECwYkqdeKDf X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-08_05,2022-02-07_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 spamscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 impostorscore=0 mlxlogscore=702 clxscore=1015 adultscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202080101 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This patch enables the ultravisor adapter interruption vitualization support indicated by UV feature BIT_UV_FEAT_AIV. This allows ISC interruption injection directly into the GISA IPM for PV kvm guests. Hardware that does not support this feature will continue to use the UV interruption interception method to deliver ISC interruptions to PV kvm guests. For this purpose, the ECA_AIV bit for all guest cpus will be cleared and the GISA will be disabled during PV CPU setup. In addition a check in __inject_io() has been removed. That reduces the required instructions for interruption handling for PV and traditional kvm guests. Signed-off-by: Michael Mueller --- arch/s390/include/asm/uv.h | 1 + arch/s390/kvm/interrupt.c | 53 +++++++++++++++++++++++++++++++++----- arch/s390/kvm/kvm-s390.c | 12 ++++++--- arch/s390/kvm/kvm-s390.h | 11 ++++++++ 4 files changed, 68 insertions(+), 9 deletions(-) diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h index 86218382d29c..a2d376b8bce3 100644 --- a/arch/s390/include/asm/uv.h +++ b/arch/s390/include/asm/uv.h @@ -80,6 +80,7 @@ enum uv_cmds_inst { enum uv_feat_ind { BIT_UV_FEAT_MISC = 0, + BIT_UV_FEAT_AIV = 1, }; struct uv_cb_header { diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index db933c252dbc..d45e26e31d3d 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -1901,13 +1901,12 @@ static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti) isc = int_word_to_isc(inti->io.io_int_word); /* - * Do not make use of gisa in protected mode. We do not use the lock - * checking variant as this is just a performance optimization and we - * do not hold the lock here. This is ok as the code will pick - * interrupts from both "lists" for delivery. + * We do not use the lock checking variant as this is just a + * performance optimization and we do not hold the lock here. + * This is ok as the code will pick interrupts from both "lists" + * for delivery. */ - if (!kvm_s390_pv_get_handle(kvm) && - gi->origin && inti->type & KVM_S390_INT_IO_AI_MASK) { + if (gi->origin && inti->type & KVM_S390_INT_IO_AI_MASK) { VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc); gisa_set_ipm_gisc(gi->origin, isc); kfree(inti); @@ -3171,9 +3170,32 @@ void kvm_s390_gisa_init(struct kvm *kvm) VM_EVENT(kvm, 3, "gisa 0x%pK initialized", gi->origin); } +void kvm_s390_gisa_enable(struct kvm *kvm) +{ + struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int; + struct kvm_vcpu *vcpu; + unsigned long i; + + if (gi->origin) + return; + kvm_s390_gisa_init(kvm); + kvm_for_each_vcpu(i, vcpu, kvm) { + mutex_lock(&vcpu->mutex); + vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(kvm); + if (vcpu->arch.sie_block->gd) { + vcpu->arch.sie_block->eca |= ECA_AIV; + VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u", + vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id); + } + mutex_unlock(&vcpu->mutex); + } +} + + void kvm_s390_gisa_destroy(struct kvm *kvm) { struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int; + struct kvm_s390_gisa *gisa = gi->origin; if (!gi->origin) return; @@ -3184,6 +3206,25 @@ void kvm_s390_gisa_destroy(struct kvm *kvm) cpu_relax(); hrtimer_cancel(&gi->timer); gi->origin = NULL; + VM_EVENT(kvm, 3, "gisa 0x%pK destroyed", gisa); +} + +void kvm_s390_gisa_disable(struct kvm *kvm) +{ + struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int; + struct kvm_vcpu *vcpu; + unsigned long i; + + if (!gi->origin) + return; + kvm_for_each_vcpu(i, vcpu, kvm) { + mutex_lock(&vcpu->mutex); + vcpu->arch.sie_block->eca &= ~ECA_AIV; + vcpu->arch.sie_block->gd = 0U; + mutex_unlock(&vcpu->mutex); + VCPU_EVENT(vcpu, 3, "AIV disabled for cpu %03u", vcpu->vcpu_id); + } + kvm_s390_gisa_destroy(kvm); } /** diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 577f1ead6a51..72a3c9a7c9dd 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -2194,6 +2194,9 @@ static int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rcp, u16 *rrcp) } mutex_unlock(&vcpu->mutex); } + /* Finally enable the GISA if required for traditional KVM guests */ + if (use_gisa) + kvm_s390_gisa_enable(kvm); return ret; } @@ -2205,6 +2208,10 @@ static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc) struct kvm_vcpu *vcpu; + /* First disable the GISA if the ultravisor does not support AIV. */ + if (!test_bit_inv(BIT_UV_FEAT_AIV, &uv_info.uv_feature_indications)) + kvm_s390_gisa_disable(kvm); + kvm_for_each_vcpu(i, vcpu, kvm) { mutex_lock(&vcpu->mutex); r = kvm_s390_pv_create_cpu(vcpu, rc, rrc); @@ -2268,6 +2275,7 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) */ if (r) break; + r = kvm_s390_pv_deinit_vm(kvm, &cmd->rc, &cmd->rrc); /* no need to block service interrupts any more */ @@ -3263,9 +3271,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) vcpu->arch.sie_block->icpua = vcpu->vcpu_id; spin_lock_init(&vcpu->arch.local_int.lock); - vcpu->arch.sie_block->gd = (u32)(u64)vcpu->kvm->arch.gisa_int.origin; - if (vcpu->arch.sie_block->gd && sclp.has_gisaf) - vcpu->arch.sie_block->gd |= GISA_FORMAT1; + vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(vcpu->kvm); seqcount_init(&vcpu->arch.cputm_seqcount); vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h index 098831e815e6..4ba8fc30d87a 100644 --- a/arch/s390/kvm/kvm-s390.h +++ b/arch/s390/kvm/kvm-s390.h @@ -231,6 +231,15 @@ static inline unsigned long kvm_s390_get_gfn_end(struct kvm_memslots *slots) return ms->base_gfn + ms->npages; } +static inline u32 kvm_s390_get_gisa_desc(struct kvm *kvm) +{ + u32 gd = (u32)(u64)kvm->arch.gisa_int.origin; + + if (gd && sclp.has_gisaf) + gd |= GISA_FORMAT1; + return gd; +} + /* implemented in pv.c */ int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc); int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc); @@ -450,6 +459,8 @@ int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, void kvm_s390_gisa_init(struct kvm *kvm); void kvm_s390_gisa_clear(struct kvm *kvm); void kvm_s390_gisa_destroy(struct kvm *kvm); +void kvm_s390_gisa_disable(struct kvm *kvm); +void kvm_s390_gisa_enable(struct kvm *kvm); int kvm_s390_gib_init(u8 nisc); void kvm_s390_gib_destroy(void);