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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 D8741C46471 for ; Tue, 7 Aug 2018 17:15:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9AF172083C for ; Tue, 7 Aug 2018 17:15:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9AF172083C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390175AbeHGTa3 (ORCPT ); Tue, 7 Aug 2018 15:30:29 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:49930 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727354AbeHGTa3 (ORCPT ); Tue, 7 Aug 2018 15:30:29 -0400 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 w77H9l6N070998 for ; Tue, 7 Aug 2018 13:15:09 -0400 Received: from e06smtp07.uk.ibm.com (e06smtp07.uk.ibm.com [195.75.94.103]) by mx0a-001b2d01.pphosted.com with ESMTP id 2kqe30cep1-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 07 Aug 2018 13:15:09 -0400 Received: from localhost by e06smtp07.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, 7 Aug 2018 18:15:05 +0100 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w77HF31V24183028 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Tue, 7 Aug 2018 17:15:03 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6BD5F4C050; Tue, 7 Aug 2018 20:15:12 +0100 (BST) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 296824C046; Tue, 7 Aug 2018 20:15:12 +0100 (BST) Received: from [9.152.224.92] (unknown [9.152.224.92]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 7 Aug 2018 20:15:12 +0100 (BST) Reply-To: pmorel@linux.ibm.com Subject: Re: [PATCH RFC 0/2] KVM: s390: vsie: support VCPU requests To: David Hildenbrand , linux-kernel@vger.kernel.org Cc: linux-s390@vger.kernel.org, Heiko Carstens , Martin Schwidefsky , Cornelia Huck , Janosch Frank , Christian Borntraeger References: <20180807125131.3606-1-david@redhat.com> From: Pierre Morel Date: Tue, 7 Aug 2018 19:15:02 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180807125131.3606-1-david@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 18080717-0028-0000-0000-000002E7821A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18080717-0029-0000-0000-000023A088A7 Message-Id: <65aefa0e-275f-1a30-2237-904aa4c6d63b@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-07_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=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1808070172 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/08/2018 14:51, David Hildenbrand wrote: > While discussing AP changes, we discovered that we will have to force > a CPU using the vSIE to regenerate/reload shadow data structures. For now, > we have no mechanism for that. > > E.g. when clearing AP masks later, we could still have a vSIE CPU making > use of AP adapters as the masks might not be considered yet in the vSIE > data structures. We need a way to block entering the vSIE and regenerate > all shadow data structures once done. > > Looks like we can achieve that by simply simulating an ordinary SIE > entry/exit in the VCPU sie control block (while entering the vSIE loop). > > This way, we can support blocking and also synchronous CPU requests. > > Only compile tested. > > David Hildenbrand (2): > KVM: s390: vsie: simulate VCPU SIE entry/exit > KVM: s390: introduce and use KVM_REQ_VSIE_RESTART > > arch/s390/include/asm/kvm_host.h | 1 + > arch/s390/kvm/kvm-s390.c | 16 ++++++++++++++-- > arch/s390/kvm/kvm-s390.h | 1 + > arch/s390/kvm/vsie.c | 20 ++++++++++++++++++-- > 4 files changed, 34 insertions(+), 4 deletions(-) > Thanks David for your patches. Following my tests, they work fine for our AP use case. Best regards, Pierre -- Pierre Morel Linux/KVM/QEMU in Böblingen - Germany