From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90C71C43387 for ; Thu, 20 Dec 2018 14:32:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 65AD921852 for ; Thu, 20 Dec 2018 14:32:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387549AbeLTOcK (ORCPT ); Thu, 20 Dec 2018 09:32:10 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:57764 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1731393AbeLTOcJ (ORCPT ); Thu, 20 Dec 2018 09:32:09 -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 wBKET5CU030249 for ; Thu, 20 Dec 2018 09:32:08 -0500 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2pgcqv0mf7-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 20 Dec 2018 09:32:08 -0500 Received: from localhost by e06smtp04.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) Thu, 20 Dec 2018 14:32:02 -0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wBKEW1IO3015056 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 20 Dec 2018 14:32:01 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 2FB9E52054; Thu, 20 Dec 2018 14:32:01 +0000 (GMT) Received: from [9.152.224.123] (unknown [9.152.224.123]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id C3F6A52050; Thu, 20 Dec 2018 14:32:00 +0000 (GMT) Reply-To: mimu@linux.ibm.com Subject: Re: [PATCH v5 10/15] KVM: s390: add functions to (un)register GISC with GISA To: KVM Mailing List Cc: Linux-S390 Mailing List , linux-kernel@vger.kernel.org, Martin Schwidefsky , Heiko Carstens , Christian Borntraeger , Janosch Frank , David Hildenbrand , Cornelia Huck , Halil Pasic , Pierre Morel References: <20181219191756.57973-1-mimu@linux.ibm.com> <20181219191756.57973-11-mimu@linux.ibm.com> From: Michael Mueller Organization: IBM Date: Thu, 20 Dec 2018 15:32:00 +0100 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20181219191756.57973-11-mimu@linux.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 18122014-0016-0000-0000-00000239395D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18122014-0017-0000-0000-000032919589 Message-Id: <23513047-9ef8-c0a3-1b7f-d87e02da4c90@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-12-20_07:,, 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=885 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1812200119 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 19.12.18 20:17, Michael Mueller wrote: > Add the IAM (Interruption Alert Mask) to the architecture specific > kvm struct. This mask in the GISA is used to define for which ISC > a GIB alert can be issued. > > The functions kvm_s390_gisc_register() and kvm_s390_gisc_unregister() > are used to (un)register a GISC (guest ISC) with a virtual machine and > its GISA. > > Upon successful completion, kvm_s390_gisc_register() returns the > ISC to be used for GIB alert interruptions. A negative return code > indicates an error during registration. > > Theses functions will be used by other adapter types like AP and PCI to > request pass-through interruption support. > > Signed-off-by: Michael Mueller > --- > arch/s390/include/asm/kvm_host.h | 9 ++++++ > arch/s390/kvm/interrupt.c | 66 ++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 75 insertions(+) > ... > --- a/arch/s390/kvm/interrupt.c > +++ b/arch/s390/kvm/interrupt.c > @@ -229,6 +229,25 @@ static inline u8 int_word_to_isc(u32 int_word) > */ > #define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE) > > +static inline int set_iam(struct kvm_s390_gisa *gisa, u8 iam) I will rename this one here as well to gisa_set_iam() > +{ > + u64 word0, _word0; > + > + do { > + word0 = READ_ONCE(gisa->u64.word[0]); > + /* If the GISA is in the alert list, do nothing. */ > + if ((u64)gisa != word0 >> 32) > + return -EBUSY; > + /* > + * Try to set the IAM or loop, if the IPM has changed > + * or the GISA has been inserted into the alert list. > + */ > + _word0 = (word0 & ~0xffUL) | iam; > + } while (cmpxchg(&gisa->u64.word[0], word0, _word0) != _word0); > + > + return 0; > +} > +