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 A2D9BC4332F for ; Tue, 7 Dec 2021 20:59:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241495AbhLGVDD (ORCPT ); Tue, 7 Dec 2021 16:03:03 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:10744 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241545AbhLGVCs (ORCPT ); Tue, 7 Dec 2021 16:02:48 -0500 Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1B7Jbhsh027795; Tue, 7 Dec 2021 20:59:17 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=abWMLdwTknjr87lekvmnQSuIt49FKXcPqaPgl7xGSB8=; b=hQoY0ZgkI8SfF8Iyrv4UHtUD0KCySOK8nSMOB4CH6x166WnZb9O0AyH8uyR33cIXwbYt UlPr+1G1Di6ms/0PS6UncTWWoZBFxbneN7ZkWjMhT/oFdl2Mh3DLHG0Awc/LH7Zr+iSX jmuT/PAwt45GoLYBHQwOzT//Yp35tu4JaH91qjH1CxhHeEdrsS1ls3YND+buWKQzHQOR kKMx3h/WVHFZvMYD6hbgUDh1YtE/VQ+TJGKFZwNhQFkki+W2EHXHICzy2i6Yl09Nh+k+ 70+o+VU2ngCEmJU1raAKHCEaYYTVYj9NW53/wzPt2F4jR90Jnbi0RUxcbvuw9GSL5ExJ uA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ctdqf9nts-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 07 Dec 2021 20:59:17 +0000 Received: from m0098394.ppops.net (m0098394.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 1B7KwO6D023430; Tue, 7 Dec 2021 20:59:16 GMT Received: from ppma02wdc.us.ibm.com (aa.5b.37a9.ip4.static.sl-reverse.com [169.55.91.170]) by mx0a-001b2d01.pphosted.com with ESMTP id 3ctdqf9ntf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 07 Dec 2021 20:59:16 +0000 Received: from pps.filterd (ppma02wdc.us.ibm.com [127.0.0.1]) by ppma02wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1B7KvuUh010261; Tue, 7 Dec 2021 20:59:15 GMT Received: from b01cxnp22036.gho.pok.ibm.com (b01cxnp22036.gho.pok.ibm.com [9.57.198.26]) by ppma02wdc.us.ibm.com with ESMTP id 3cqyyamjvh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 07 Dec 2021 20:59:15 +0000 Received: from b01ledav005.gho.pok.ibm.com (b01ledav005.gho.pok.ibm.com [9.57.199.110]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1B7KxEhW19858120 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 7 Dec 2021 20:59:14 GMT Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E9208AE05F; Tue, 7 Dec 2021 20:59:13 +0000 (GMT) Received: from b01ledav005.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DC369AE067; Tue, 7 Dec 2021 20:59:08 +0000 (GMT) Received: from li-c92d2ccc-254b-11b2-a85c-a700b5bfb098.ibm.com.com (unknown [9.211.152.43]) by b01ledav005.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 7 Dec 2021 20:59:08 +0000 (GMT) From: Matthew Rosato To: linux-s390@vger.kernel.org Cc: alex.williamson@redhat.com, cohuck@redhat.com, schnelle@linux.ibm.com, farman@linux.ibm.com, pmorel@linux.ibm.com, borntraeger@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, gerald.schaefer@linux.ibm.com, agordeev@linux.ibm.com, frankja@linux.ibm.com, david@redhat.com, imbrenda@linux.ibm.com, vneethv@linux.ibm.com, oberpar@linux.ibm.com, freude@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 15/32] KVM: s390: pci: enable host forwarding of Adapter Event Notifications Date: Tue, 7 Dec 2021 15:57:26 -0500 Message-Id: <20211207205743.150299-16-mjrosato@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211207205743.150299-1-mjrosato@linux.ibm.com> References: <20211207205743.150299-1-mjrosato@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: YcARRnlGU23bq5OVdyj41uadK2GAbqAA X-Proofpoint-ORIG-GUID: qccB15zIUJedUPqoJ-_tBrSypoNF2ulT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-07_08,2021-12-06_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=999 mlxscore=0 clxscore=1015 impostorscore=0 malwarescore=0 bulkscore=0 lowpriorityscore=0 spamscore=0 suspectscore=0 priorityscore=1501 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112070126 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In cases where interrupts are not forwarded to the guest via firmware, KVM is responsible for ensuring delivery. When an interrupt presents with the forwarding bit, we must process the forwarding tables until all interrupts are delivered. Signed-off-by: Matthew Rosato --- arch/s390/include/asm/kvm_host.h | 1 + arch/s390/include/asm/tpi.h | 14 ++++++ arch/s390/kvm/interrupt.c | 76 +++++++++++++++++++++++++++++++- arch/s390/kvm/kvm-s390.c | 3 +- arch/s390/kvm/pci.h | 9 ++++ 5 files changed, 101 insertions(+), 2 deletions(-) diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index a604d51acfc8..3f147b8d050b 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -757,6 +757,7 @@ struct kvm_vm_stat { u64 inject_pfault_done; u64 inject_service_signal; u64 inject_virtio; + u64 aen_forward; }; struct kvm_arch_memory_slot { diff --git a/arch/s390/include/asm/tpi.h b/arch/s390/include/asm/tpi.h index 1ac538b8cbf5..47a531fdb15b 100644 --- a/arch/s390/include/asm/tpi.h +++ b/arch/s390/include/asm/tpi.h @@ -19,6 +19,20 @@ struct tpi_info { u32 :12; } __packed __aligned(4); +/* I/O-Interruption Code as stored by TPI for an Adapter I/O */ +struct tpi_adapter_info { + u32 :1; + u32 pci:1; + u32 :28; + u32 error:1; + u32 forward:1; + u32 reserved; + u32 adapter_IO:1; + u32 directed_irq:1; + u32 isc:3; + u32 :27; +} __packed __aligned(4); + #endif /* __ASSEMBLY__ */ #endif /* _ASM_S390_TPI_H */ diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 4efe0e95a40f..c6ff871a6ed1 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -3263,11 +3263,85 @@ int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc) } EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister); +static void aen_host_forward(struct zpci_aift *aift, unsigned long si) +{ + struct kvm_s390_gisa_interrupt *gi; + struct zpci_gaite *gaite; + struct kvm *kvm; + + gaite = (struct zpci_gaite *)aift->gait + + (si * sizeof(struct zpci_gaite)); + if (gaite->count == 0) + return; + if (gaite->aisb != 0) + set_bit_inv(gaite->aisbo, (unsigned long *)gaite->aisb); + + kvm = kvm_s390_pci_si_to_kvm(aift, si); + if (kvm == 0) + return; + gi = &kvm->arch.gisa_int; + + if (!(gi->origin->g1.simm & AIS_MODE_MASK(gaite->gisc)) || + !(gi->origin->g1.nimm & AIS_MODE_MASK(gaite->gisc))) { + gisa_set_ipm_gisc(gi->origin, gaite->gisc); + if (hrtimer_active(&gi->timer)) + hrtimer_cancel(&gi->timer); + hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL); + kvm->stat.aen_forward++; + } +} + +static void aen_process_gait(u8 isc) +{ + bool found = false, first = true; + union zpci_sic_iib iib = {{0}}; + unsigned long si, flags; + struct zpci_aift *aift; + + aift = kvm_s390_pci_get_aift(); + spin_lock_irqsave(&aift->gait_lock, flags); + + if (!aift->gait) { + spin_unlock_irqrestore(&aift->gait_lock, flags); + return; + } + + for (si = 0;;) { + /* Scan adapter summary indicator bit vector */ + si = airq_iv_scan(aift->sbv, si, airq_iv_end(aift->sbv)); + if (si == -1UL) { + if (first || found) { + /* Reenable interrupts. */ + if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, isc, + &iib)) + break; + first = found = false; + } else { + /* Interrupts on and all bits processed */ + break; + } + found = false; + si = 0; + continue; + } + found = true; + aen_host_forward(aift, si); + } + + spin_unlock_irqrestore(&aift->gait_lock, flags); +} + static void gib_alert_irq_handler(struct airq_struct *airq, struct tpi_info *tpi_info) { + struct tpi_adapter_info *info = (struct tpi_adapter_info *)tpi_info; + inc_irq_stat(IRQIO_GAL); - process_gib_alert_list(); + + if (info->forward || info->error) + aen_process_gait(info->isc); + else + process_gib_alert_list(); } static struct airq_struct gib_alert_irq = { diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 9cd3c8eb59e8..c8fe9b7c2395 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -65,7 +65,8 @@ const struct _kvm_stats_desc kvm_vm_stats_desc[] = { STATS_DESC_COUNTER(VM, inject_float_mchk), STATS_DESC_COUNTER(VM, inject_pfault_done), STATS_DESC_COUNTER(VM, inject_service_signal), - STATS_DESC_COUNTER(VM, inject_virtio) + STATS_DESC_COUNTER(VM, inject_virtio), + STATS_DESC_COUNTER(VM, aen_forward) }; const struct kvm_stats_header kvm_vm_stats_header = { diff --git a/arch/s390/kvm/pci.h b/arch/s390/kvm/pci.h index 74b06d39be3b..776b2745c675 100644 --- a/arch/s390/kvm/pci.h +++ b/arch/s390/kvm/pci.h @@ -12,6 +12,7 @@ #include #include +#include #include #include @@ -32,6 +33,14 @@ struct zpci_aift { struct mutex lock; /* Protects the other structures in aift */ }; +static inline struct kvm *kvm_s390_pci_si_to_kvm(struct zpci_aift *aift, + unsigned long si) +{ + if (aift->kzdev == 0 || aift->kzdev[si] == 0) + return 0; + return aift->kzdev[si]->kvm; +}; + struct zpci_aift *kvm_s390_pci_get_aift(void); int kvm_s390_pci_aen_init(u8 nisc); -- 2.27.0