From patchwork Fri Nov 30 14:32:12 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Mueller X-Patchwork-Id: 10706423 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 50EF614E2 for ; Fri, 30 Nov 2018 14:32:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 428CD30125 for ; Fri, 30 Nov 2018 14:32:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3743E3018D; Fri, 30 Nov 2018 14:32:40 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 A60E23018C for ; Fri, 30 Nov 2018 14:32:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727083AbeLABmI (ORCPT ); Fri, 30 Nov 2018 20:42:08 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:57022 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727026AbeLABmI (ORCPT ); Fri, 30 Nov 2018 20:42:08 -0500 Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wAUETM7x053305 for ; Fri, 30 Nov 2018 09:32:36 -0500 Received: from e06smtp05.uk.ibm.com (e06smtp05.uk.ibm.com [195.75.94.101]) by mx0a-001b2d01.pphosted.com with ESMTP id 2p36f7a90v-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 30 Nov 2018 09:32:36 -0500 Received: from localhost by e06smtp05.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 30 Nov 2018 14:32:32 -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 wAUEWUhx63176890 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 30 Nov 2018 14:32:30 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 97AF24C058; Fri, 30 Nov 2018 14:32:30 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4791E4C052; Fri, 30 Nov 2018 14:32:30 +0000 (GMT) Received: from s38lp84.lnxne.boe (unknown [9.152.108.100]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 30 Nov 2018 14:32:30 +0000 (GMT) From: Michael Mueller To: KVM Mailing List , Linux-S390 Mailing List Cc: Martin Schwidefsky , Heiko Carstens , Christian Borntraeger , Janosch Frank , David Hildenbrand , Cornelia Huck , Halil Pasic , Pierre Morel , Michael Mueller Subject: [PATCH v4 07/10] KVM: s390: add function process_gib_alert_list() Date: Fri, 30 Nov 2018 15:32:12 +0100 X-Mailer: git-send-email 2.13.4 In-Reply-To: <20181130143215.69496-1-mimu@linux.ibm.com> References: <20181130143215.69496-1-mimu@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18113014-0020-0000-0000-000002F02F9D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18113014-0021-0000-0000-0000213F95A6 Message-Id: <20181130143215.69496-8-mimu@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-11-30_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1811300124 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This function processes the gib alert list. It is required to run when either a gib alert interruption has been received or a gisa that might be in the alert list is cleared or dropped. The GIB alert list contains all GISAs that have pending adapter interruptions. Signed-off-by: Michael Mueller Reviewed-by: Cornelia Huck Reviewed-by: Pierre Morel --- arch/s390/kvm/interrupt.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 251d01f1e9bf..37a5df4e8dac 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -2900,6 +2900,56 @@ static void nullify_gisa(struct kvm_s390_gisa *gisa) gisa->next_alert = (u32)(u64)gisa; } +#define NULL_GISA_ADDR 0x00000000UL +#define NONE_GISA_ADDR 0x00000001UL +#define GISA_ADDR_MASK 0xfffff000UL + +static void __maybe_unused process_gib_alert_list(void) +{ + u32 final, next_alert, origin = 0UL; + struct kvm_s390_gisa *gisa; + struct kvm_vcpu *vcpu; + struct kvm *kvm; + + do { + /* + * If the NONE_GISA_ADDR is still stored in the alert list + * origin, we will leave the outer loop. No further GISA has + * been added to the alert list by millicode while processing + * the current alert list. + */ + final = (origin & NONE_GISA_ADDR); + /* + * Cut off the alert list and store the NONE_GISA_ADDR in the + * alert list origin to avoid further GAL interruptions. + * A new alert list can be build up by millicode in parallel + * for guests not in the yet cut-off alert list. When in the + * final loop, store the NULL_GISA_ADDR instead. This will re- + * enable GAL interruptions on the host again. + */ + for (origin = xchg(&gib->alert_list_origin, + (!final) ? NONE_GISA_ADDR : NULL_GISA_ADDR); + /* Loop through the just cut-off alert list. */ + origin & GISA_ADDR_MASK; + origin = next_alert) { + gisa = (struct kvm_s390_gisa *)(u64)origin; + next_alert = gisa->next_alert; + /* Unlink the GISA from the alert list. */ + gisa->next_alert = origin; + if (!kvm_s390_gisa_get_ipm(gisa)) + continue; + /* + * Wake-up an idle vcpu of the kvm this GISA + * belongs to if available. + */ + kvm = container_of(gisa, struct sie_page2, gisa)->kvm; + vcpu = __find_vcpu_for_floating_irq(kvm); + if (vcpu) + kvm_s390_vcpu_wakeup(vcpu); + } + } while (!final); +} + void kvm_s390_gisa_clear(struct kvm *kvm) { if (kvm->arch.gisa) {