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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 6 Apr 2020 09:32:31 +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 0368WpKb54132762 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 6 Apr 2020 08:32:51 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F187B4C050; Mon, 6 Apr 2020 08:32:50 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 758994C052; Mon, 6 Apr 2020 08:32:50 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.23.63]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 6 Apr 2020 08:32:50 +0000 (GMT) Subject: Re: [PATCH v2 1/5] KVM: s390: vsie: Fix region 1 ASCE sanity shadow address checks To: David Hildenbrand Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Vasily Gorbik , Heiko Carstens , Cornelia Huck , Janosch Frank , stable@vger.kernel.org References: <59b411eb-dabe-8cac-9270-7a9f0faa63d5@de.ibm.com> <67F45F4F-33CB-455A-8CB8-7D20D9A2BF2F@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <67F45F4F-33CB-455A-8CB8-7D20D9A2BF2F@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 20040608-4275-0000-0000-000003BA85B6 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20040608-4276-0000-0000-000038CFE2AE Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.676 definitions=2020-04-06_03:2020-04-03,2020-04-06 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 clxscore=1015 impostorscore=0 suspectscore=0 phishscore=0 mlxscore=0 spamscore=0 mlxlogscore=999 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2004060068 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03.04.20 21:55, David Hildenbrand wrote: > > >> Am 03.04.2020 um 19:56 schrieb Christian Borntraeger : >> >>  >> >>> On 03.04.20 17:30, David Hildenbrand wrote: >>> In case we have a region 1 ASCE, our shadow/g3 address can have any value. >>> Unfortunately, (-1UL << 64) is undefined and triggers sometimes, >>> rejecting valid shadow addresses when trying to walk our shadow table >>> hierarchy. >> >> I thin the range of the addresses do not matter. >> Took me a while to understand maybe rephrase that: >> >> In case we have a region 1 the following calculation >> (31 + ((gmap->asce & _ASCE_TYPE_MASK) >> 2)*11) >> results in 64. As shifts beyond the size are undefined the compiler is free to use >> instructions like sllg. sllg will only use 6 bits of the shift value (here 64) >> resulting in no shift at all. That means that ALL addresses will be rejected. > > Interestingly, it would not fail when shadowing the r2t, but only when trying to shadow the r3t. > >> >> With that this makes sense. >> >> Reviewed-by: Christian Borntraeger >> > > In case there are no other comments, can you fixup when applying, or do you want me to resend? I can fixup.