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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 24 May 2019 13:56:39 +0100 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x4OCucBg57737310 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 24 May 2019 12:56:38 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1501CA4060; Fri, 24 May 2019 12:56:38 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 898C3A405F; Fri, 24 May 2019 12:56:37 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.172.211]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 24 May 2019 12:56:37 +0000 (GMT) Subject: Re: [PATCH v1 0/9] KVM selftests for s390x To: David Hildenbrand , Thomas Huth , Janosch Frank , kvm@vger.kernel.org Cc: Paolo Bonzini , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= , Shuah Khan , Cornelia Huck , Andrew Jones , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org References: <20190523164309.13345-1-thuth@redhat.com> <0ad63449-c329-f38d-b879-6e427e6a8656@de.ibm.com> <411d4ad9-b43e-d3ae-1b66-65888c894caa@de.ibm.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: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19052412-0008-0000-0000-000002E9FC72 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19052412-0009-0000-0000-00002256BF28 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-24_05:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=649 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905240087 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 24.05.19 14:36, David Hildenbrand wrote: > On 24.05.19 14:29, Christian Borntraeger wrote: >> >> >> On 24.05.19 14:17, Christian Borntraeger wrote: >>> >>> >>> On 24.05.19 13:11, Christian Borntraeger wrote: >>>> I do get >>>> >>>> [10400.440298] kvm-s390: failed to commit memory region >>>> [10400.508723] kvm-s390: failed to commit memory region >>>> >>>> when running the tests. Will have a look. >>> >>> It comes from kvm_vm_free. This calls KVM_SET_USER_MEMORY_REGION with size 0, >>> which the s390 code does not like. >>> >> >> The doc says about KVM_SET_USER_MEMORY_REGION: >> >> This ioctl allows the user to create or modify a guest physical memory >> slot. When changing an existing slot, it may be moved in the guest >> physical memory space, or its flags may be modified. --> It may not be >> resized. <---- > > Size 0 is deleting, not resizing AFAIK. Right this seems to translate to KVM_MR_DELETE, which the s390 code does not handle (we will simply deliver a page fault as we share the last page table level). I will have a look at implementing KVM_MR_DELETE and KVM_MR_MOVE. In fact, we should have a testcase for that as well.