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=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 ABD6EC34024 for ; Mon, 17 Feb 2020 18:40:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 86930214D8 for ; Mon, 17 Feb 2020 18:40:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727429AbgBQSkp (ORCPT ); Mon, 17 Feb 2020 13:40:45 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:41292 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726817AbgBQSko (ORCPT ); Mon, 17 Feb 2020 13:40:44 -0500 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 01HIY2sP003634 for ; Mon, 17 Feb 2020 13:40:43 -0500 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 2y6dp8h48d-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 17 Feb 2020 13:40:43 -0500 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) Mon, 17 Feb 2020 18:40:38 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 01HIeYAa34799980 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 17 Feb 2020 18:40:35 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E01FCA4054; Mon, 17 Feb 2020 18:40:34 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4FFA6A405F; Mon, 17 Feb 2020 18:40:34 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.10.11]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 17 Feb 2020 18:40:34 +0000 (GMT) Subject: Re: [PATCH v2 23/42] KVM: s390: protvirt: Write sthyi data to instruction data area To: David Hildenbrand , Janosch Frank Cc: KVM , Cornelia Huck , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , linux-s390 , Michael Mueller , Vasily Gorbik , Janosch Frank References: <20200214222658.12946-1-borntraeger@de.ibm.com> <20200214222658.12946-24-borntraeger@de.ibm.com> <0054ceb5-a1ab-5129-cc34-b785ee8ad782@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <0054ceb5-a1ab-5129-cc34-b785ee8ad782@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 20021718-0008-0000-0000-00000353DC13 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20021718-0009-0000-0000-00004A74E303 Message-Id: <286d4d0a-84a2-5298-c4f9-221d5b4d2b13@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-17_12:2020-02-17,2020-02-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 mlxlogscore=999 suspectscore=2 adultscore=0 bulkscore=0 impostorscore=0 clxscore=1015 spamscore=0 priorityscore=1501 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002170151 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 17.02.20 15:24, David Hildenbrand wrote: > On 14.02.20 23:26, Christian Borntraeger wrote: >> From: Janosch Frank >> >> STHYI data has to go through the bounce buffer. >> >> Signed-off-by: Janosch Frank >> Reviewed-by: Thomas Huth >> Reviewed-by: Cornelia Huck >> [borntraeger@de.ibm.com: patch merging, splitting, fixing] >> Signed-off-by: Christian Borntraeger >> --- >> arch/s390/kvm/intercept.c | 15 ++++++++++----- >> 1 file changed, 10 insertions(+), 5 deletions(-) >> >> diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c >> index 1e231058e4b3..cfabeecbb777 100644 >> --- a/arch/s390/kvm/intercept.c >> +++ b/arch/s390/kvm/intercept.c >> @@ -392,7 +392,7 @@ int handle_sthyi(struct kvm_vcpu *vcpu) >> goto out; >> } >> >> - if (addr & ~PAGE_MASK) >> + if (!kvm_s390_pv_is_protected(vcpu->kvm) && (addr & ~PAGE_MASK)) >> return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); >> >> sctns = (void *)get_zeroed_page(GFP_KERNEL); >> @@ -403,10 +403,15 @@ int handle_sthyi(struct kvm_vcpu *vcpu) >> >> out: >> if (!cc) { >> - r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE); >> - if (r) { >> - free_page((unsigned long)sctns); >> - return kvm_s390_inject_prog_cond(vcpu, r); >> + if (kvm_s390_pv_is_protected(vcpu->kvm)) { > > I have the feeling that we might have to think about proper locking for > kvm_s390_pv_is_protected(). We have to make sure there cannot be any > races with user space. Smells like a new r/w lock maybe. I think we can keep that within kvm->lock (for the global changes) and vcpu->mutex. All the intercepts only happen within the vcpu run ioctl and that takes the vcpu->mutex. See my other patch (with mutex_lock(&vcpu->mutex) and mutex_unlock(&vcpu->mutex) around the create/destroy functions). lockdep_assert_help is happy and as long as the pv_handle reflects the state of the control block of that CPU we are good. I pushed out the patch/rfcs to pv_worktree on kvms390.git.