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Thu, 27 Jun 2024 11:52:07 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 19A492004D; Thu, 27 Jun 2024 11:52:05 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A59A920043; Thu, 27 Jun 2024 11:52:04 +0000 (GMT) Received: from [9.171.15.243] (unknown [9.171.15.243]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 27 Jun 2024 11:52:04 +0000 (GMT) Message-ID: <9d4ee8a4-d743-4bc6-a743-0812b9e06f85@linux.ibm.com> Date: Thu, 27 Jun 2024 13:52:04 +0200 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] s390/kvm: Reject memory region operations for ucontrol VMs To: Christoph Schlameuss , linux-s390@vger.kernel.org Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Christian Borntraeger , Claudio Imbrenda , David Hildenbrand , Paolo Bonzini , Jonathan Corbet , linux-doc@vger.kernel.org References: <20240624095902.29375-1-schlameuss@linux.ibm.com> Content-Language: en-US From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: rxGvdYRGuqQscZanuxvi1e2sZ7kHfqLf X-Proofpoint-ORIG-GUID: vsgiaOPue_Y2xFLYw71govuFTOtaSffb X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-27_06,2024-06-27_02,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 spamscore=0 suspectscore=0 phishscore=0 priorityscore=1501 mlxlogscore=646 clxscore=1011 malwarescore=0 lowpriorityscore=0 bulkscore=0 adultscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2406140001 definitions=main-2406270086 On 6/24/24 11:59, Christoph Schlameuss wrote: > This change rejects the KVM_SET_USER_MEMORY_REGION and > KVM_SET_USER_MEMORY_REGION2 ioctls when called on a ucontrol VM. > This is neccessary since ucontrol VMs have kvm->arch.gmap set to 0 and > would thus result in a null pointer dereference further in. > Memory management needs to be performed in userspace and using the > ioctls KVM_S390_UCAS_MAP and KVM_S390_UCAS_UNMAP. > > Also improve s390 specific documentation for KVM_SET_USER_MEMORY_REGION > and KVM_SET_USER_MEMORY_REGION2. > I'll add this tag when picking since it's a fix: Fixes: 27e0393f15fc ("KVM: s390: ucontrol: per vcpu address spaces") It's a bit hard to track down the commit that should have contained your code to begin with and I think this is the closest we'll get.