From patchwork Fri Apr 7 10:48:00 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Borntraeger X-Patchwork-Id: 9669245 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 631E6602B3 for ; Fri, 7 Apr 2017 10:48:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 542A128249 for ; Fri, 7 Apr 2017 10:48:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 48E8D285FE; Fri, 7 Apr 2017 10:48:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9D10428249 for ; Fri, 7 Apr 2017 10:48:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755184AbdDGKsn (ORCPT ); Fri, 7 Apr 2017 06:48:43 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:47493 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755524AbdDGKsN (ORCPT ); Fri, 7 Apr 2017 06:48:13 -0400 Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v37AiNj4011342 for ; Fri, 7 Apr 2017 06:48:13 -0400 Received: from e06smtp15.uk.ibm.com (e06smtp15.uk.ibm.com [195.75.94.111]) by mx0a-001b2d01.pphosted.com with ESMTP id 29p1n1e27g-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 07 Apr 2017 06:48:12 -0400 Received: from localhost by e06smtp15.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 7 Apr 2017 11:48:07 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v37Am7sw14877104; Fri, 7 Apr 2017 10:48:07 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A0090A4040; Fri, 7 Apr 2017 11:47:23 +0100 (BST) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8FA6DA4059; Fri, 7 Apr 2017 11:47:23 +0100 (BST) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Fri, 7 Apr 2017 11:47:23 +0100 (BST) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 25651) id 8432D20F678; Fri, 7 Apr 2017 12:48:06 +0200 (CEST) From: Christian Borntraeger To: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Cc: KVM , Christian Borntraeger , Cornelia Huck , linux-s390 , Fei Li , Yi Min Zhao Subject: [GIT PULL 7/9] KVM: s390: introduce ais mode modify function Date: Fri, 7 Apr 2017 12:48:00 +0200 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1491562082-6392-1-git-send-email-borntraeger@de.ibm.com> References: <1491562082-6392-1-git-send-email-borntraeger@de.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17040710-0020-0000-0000-0000033F0B04 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17040710-0021-0000-0000-0000412D2FEB Message-Id: <1491562082-6392-8-git-send-email-borntraeger@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-04-07_10:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1704070090 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Fei Li Provide an interface for userspace to modify AIS (adapter-interruption-suppression) mode state, and add documentation for the interface. Allowed target modes are ALL-Interruptions mode and SINGLE-Interruption mode. We introduce the 'simm' and 'nimm' fields in kvm_s390_float_interrupt to store interruption modes for each ISC. Each bit in 'simm' and 'nimm' targets to one ISC, and collaboratively indicate three modes: ALL-Interruptions, SINGLE-Interruption and NO-Interruptions. This interface can initiate most transitions between the states; transition from SINGLE-Interruption to NO-Interruptions via adapter interrupt injection will be introduced in a following patch. The meaningful combinations are as follows: interruption mode | simm bit | nimm bit ------------------|----------|---------- ALL | 0 | 0 SINGLE | 1 | 0 NO | 1 | 1 Besides, add tracepoint to track AIS mode transitions. Co-Authored-By: Yi Min Zhao Signed-off-by: Yi Min Zhao Signed-off-by: Fei Li Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger --- Documentation/virtual/kvm/devices/s390_flic.txt | 20 ++++++++++++ arch/s390/include/asm/kvm_host.h | 10 ++++++ arch/s390/include/uapi/asm/kvm.h | 6 ++++ arch/s390/kvm/interrupt.c | 43 +++++++++++++++++++++++++ arch/s390/kvm/kvm-s390.c | 4 +++ arch/s390/kvm/trace-s390.h | 31 ++++++++++++++++++ 6 files changed, 114 insertions(+) diff --git a/Documentation/virtual/kvm/devices/s390_flic.txt b/Documentation/virtual/kvm/devices/s390_flic.txt index e8ee3b6..dfd42fd 100644 --- a/Documentation/virtual/kvm/devices/s390_flic.txt +++ b/Documentation/virtual/kvm/devices/s390_flic.txt @@ -14,6 +14,7 @@ FLIC provides support to - purge one pending floating I/O interrupt (KVM_DEV_FLIC_CLEAR_IO_IRQ) - enable/disable for the guest transparent async page faults - register and modify adapter interrupt sources (KVM_DEV_FLIC_ADAPTER_*) +- modify AIS (adapter-interruption-suppression) mode state (KVM_DEV_FLIC_AISM) Groups: KVM_DEV_FLIC_ENQUEUE @@ -107,6 +108,25 @@ struct kvm_s390_io_adapter_req { release a userspace page for the translated address specified in addr from the list of mappings + KVM_DEV_FLIC_AISM + modify the adapter-interruption-suppression mode for a given isc if the + AIS capability is enabled. Takes a kvm_s390_ais_req describing: + +struct kvm_s390_ais_req { + __u8 isc; + __u16 mode; +}; + + isc contains the target I/O interruption subclass, mode the target + adapter-interruption-suppression mode. The following modes are + currently supported: + - KVM_S390_AIS_MODE_ALL: ALL-Interruptions Mode, i.e. airq injection + is always allowed; + - KVM_S390_AIS_MODE_SINGLE: SINGLE-Interruption Mode, i.e. airq + injection is only allowed once and the following adapter interrupts + will be suppressed until the mode is set again to ALL-Interruptions + or SINGLE-Interruption mode. + Note: The KVM_SET_DEVICE_ATTR/KVM_GET_DEVICE_ATTR device ioctls executed on FLIC with an unknown group or attribute gives the error code EINVAL (instead of ENXIO, as specified in the API documentation). It is not possible to conclude diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 499c72c..552c319 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -521,6 +521,12 @@ struct kvm_s390_local_interrupt { #define FIRQ_CNTR_PFAULT 3 #define FIRQ_MAX_COUNT 4 +/* mask the AIS mode for a given ISC */ +#define AIS_MODE_MASK(isc) (0x80 >> isc) + +#define KVM_S390_AIS_MODE_ALL 0 +#define KVM_S390_AIS_MODE_SINGLE 1 + struct kvm_s390_float_interrupt { unsigned long pending_irqs; spinlock_t lock; @@ -530,6 +536,10 @@ struct kvm_s390_float_interrupt { struct kvm_s390_ext_info srv_signal; int next_rr_cpu; unsigned long idle_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)]; + struct mutex ais_lock; + u8 simm; + u8 nimm; + int ais_enabled; }; struct kvm_hw_wp_info_arch { diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h index 5fa144d..50d2a92 100644 --- a/arch/s390/include/uapi/asm/kvm.h +++ b/arch/s390/include/uapi/asm/kvm.h @@ -26,6 +26,7 @@ #define KVM_DEV_FLIC_ADAPTER_REGISTER 6 #define KVM_DEV_FLIC_ADAPTER_MODIFY 7 #define KVM_DEV_FLIC_CLEAR_IO_IRQ 8 +#define KVM_DEV_FLIC_AISM 9 /* * We can have up to 4*64k pending subchannels + 8 adapter interrupts, * as well as up to ASYNC_PF_PER_VCPU*KVM_MAX_VCPUS pfault done interrupts. @@ -46,6 +47,11 @@ struct kvm_s390_io_adapter { #define KVM_S390_ADAPTER_SUPPRESSIBLE 0x01 +struct kvm_s390_ais_req { + __u8 isc; + __u16 mode; +}; + #define KVM_S390_IO_ADAPTER_MASK 1 #define KVM_S390_IO_ADAPTER_MAP 2 #define KVM_S390_IO_ADAPTER_UNMAP 3 diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index dba51ad..96b689e 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -2152,6 +2152,45 @@ static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr) return 0; } +static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr) +{ + struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int; + struct kvm_s390_ais_req req; + int ret = 0; + + if (!fi->ais_enabled) + return -ENOTSUPP; + + if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req))) + return -EFAULT; + + if (req.isc > MAX_ISC) + return -EINVAL; + + trace_kvm_s390_modify_ais_mode(req.isc, + (fi->simm & AIS_MODE_MASK(req.isc)) ? + (fi->nimm & AIS_MODE_MASK(req.isc)) ? + 2 : KVM_S390_AIS_MODE_SINGLE : + KVM_S390_AIS_MODE_ALL, req.mode); + + mutex_lock(&fi->ais_lock); + switch (req.mode) { + case KVM_S390_AIS_MODE_ALL: + fi->simm &= ~AIS_MODE_MASK(req.isc); + fi->nimm &= ~AIS_MODE_MASK(req.isc); + break; + case KVM_S390_AIS_MODE_SINGLE: + fi->simm |= AIS_MODE_MASK(req.isc); + fi->nimm &= ~AIS_MODE_MASK(req.isc); + break; + default: + ret = -EINVAL; + } + mutex_unlock(&fi->ais_lock); + + return ret; +} + static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) { int r = 0; @@ -2188,6 +2227,9 @@ static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr) case KVM_DEV_FLIC_CLEAR_IO_IRQ: r = clear_io_irq(dev->kvm, attr); break; + case KVM_DEV_FLIC_AISM: + r = modify_ais_mode(dev->kvm, attr); + break; default: r = -EINVAL; } @@ -2207,6 +2249,7 @@ static int flic_has_attr(struct kvm_device *dev, case KVM_DEV_FLIC_ADAPTER_REGISTER: case KVM_DEV_FLIC_ADAPTER_MODIFY: case KVM_DEV_FLIC_CLEAR_IO_IRQ: + case KVM_DEV_FLIC_AISM: return 0; } return -ENXIO; diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index f83f18b..977cc16 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1515,6 +1515,10 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) kvm_s390_crypto_init(kvm); + mutex_init(&kvm->arch.float_int.ais_lock); + kvm->arch.float_int.simm = 0; + kvm->arch.float_int.nimm = 0; + kvm->arch.float_int.ais_enabled = 0; spin_lock_init(&kvm->arch.float_int.lock); for (i = 0; i < FIRQ_LIST_COUNT; i++) INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]); diff --git a/arch/s390/kvm/trace-s390.h b/arch/s390/kvm/trace-s390.h index 396485b..b32994d 100644 --- a/arch/s390/kvm/trace-s390.h +++ b/arch/s390/kvm/trace-s390.h @@ -280,6 +280,37 @@ TRACE_EVENT(kvm_s390_enable_disable_ibs, __entry->state ? "enabling" : "disabling", __entry->id) ); +/* + * Trace point for modifying ais mode for a given isc. + */ +TRACE_EVENT(kvm_s390_modify_ais_mode, + TP_PROTO(__u8 isc, __u16 from, __u16 to), + TP_ARGS(isc, from, to), + + TP_STRUCT__entry( + __field(__u8, isc) + __field(__u16, from) + __field(__u16, to) + ), + + TP_fast_assign( + __entry->isc = isc; + __entry->from = from; + __entry->to = to; + ), + + TP_printk("for isc %x, modifying interruption mode from %s to %s", + __entry->isc, + (__entry->from == KVM_S390_AIS_MODE_ALL) ? + "ALL-Interruptions Mode" : + (__entry->from == KVM_S390_AIS_MODE_SINGLE) ? + "Single-Interruption Mode" : "No-Interruptions Mode", + (__entry->to == KVM_S390_AIS_MODE_ALL) ? + "ALL-Interruptions Mode" : + (__entry->to == KVM_S390_AIS_MODE_SINGLE) ? + "Single-Interruption Mode" : "No-Interruptions Mode") + ); + #endif /* _TRACE_KVMS390_H */