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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 D6EE4C04AB6 for ; Tue, 28 May 2019 13:49:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF2C220645 for ; Tue, 28 May 2019 13:49:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727555AbfE1NtJ (ORCPT ); Tue, 28 May 2019 09:49:09 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:36366 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727387AbfE1NtH (ORCPT ); Tue, 28 May 2019 09:49:07 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x4SDm2Yi031944 for ; Tue, 28 May 2019 09:49:07 -0400 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 2ss4nqv8v3-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 28 May 2019 09:49:06 -0400 Received: from localhost by e06smtp02.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) Tue, 28 May 2019 14:48:59 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x4SDmwGK51577086 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 28 May 2019 13:48:58 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6E3B352059; Tue, 28 May 2019 13:48:58 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.177]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 1154952052; Tue, 28 May 2019 13:48:58 +0000 (GMT) To: Cornelia Huck Cc: Janosch Frank , Paolo Bonzini , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Thomas Huth , kvm@vger.kernel.org, Shuah Khan , David Hildenbrand , Andrew Jones , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org References: <20190523164309.13345-1-thuth@redhat.com> <20190523164309.13345-9-thuth@redhat.com> <1deb73ac-9589-89cb-9a9b-f9957584733e@de.ibm.com> <20190528145344.42fe6bc5.cohuck@redhat.com> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190528145344.42fe6bc5.cohuck@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19052813-0008-0000-0000-000002EB3D8D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19052813-0009-0000-0000-000022580AC5 Message-Id: Subject: Re: Re: [PATCH 8/9] KVM: s390: Do not report unusabled IDs via KVM_CAP_MAX_VCPU_ID X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-28_05:,, 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=992 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905280090 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 28.05.19 14:53, Cornelia Huck wrote: > On Tue, 28 May 2019 13:00:30 +0200 > Christian Borntraeger wrote: > >> Paolo, Radim, >> >> would you consider this patch (or the full series) as 5.2 material or 5.3 material? > > FWIW, I'd consider this patch 5.2 material, as we're currently relaying > wrong values to userspace. Agreed. I will add cc stable and queue for master. What is our opinion about kselftest? Are we merging testtools changes also only during the merge window? > >> >> >> On 23.05.19 18:43, Thomas Huth wrote: >>> KVM_CAP_MAX_VCPU_ID is currently always reporting KVM_MAX_VCPU_ID on all >>> architectures. However, on s390x, the amount of usable CPUs is determined >>> during runtime - it is depending on the features of the machine the code >>> is running on. Since we are using the vcpu_id as an index into the SCA >>> structures that are defined by the hardware (see e.g. the sca_add_vcpu() >>> function), it is not only the amount of CPUs that is limited by the hard- >>> ware, but also the range of IDs that we can use. >>> Thus KVM_CAP_MAX_VCPU_ID must be determined during runtime on s390x, too. >>> So the handling of KVM_CAP_MAX_VCPU_ID has to be moved from the common >>> code into the architecture specific code, and on s390x we have to return >>> the same value here as for KVM_CAP_MAX_VCPUS. >>> This problem has been discovered with the kvm_create_max_vcpus selftest. >>> With this change applied, the selftest now passes on s390x, too. >>> >>> Signed-off-by: Thomas Huth >>> --- >>> arch/mips/kvm/mips.c | 3 +++ >>> arch/powerpc/kvm/powerpc.c | 3 +++ >>> arch/s390/kvm/kvm-s390.c | 1 + >>> arch/x86/kvm/x86.c | 3 +++ >>> virt/kvm/arm/arm.c | 3 +++ >>> virt/kvm/kvm_main.c | 2 -- >>> 6 files changed, 13 insertions(+), 2 deletions(-) >