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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 21 Feb 2020 11:26:14 -0000 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 01LBQDcm30474698 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 21 Feb 2020 11:26:13 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 437E54203F; Fri, 21 Feb 2020 11:26:13 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A633B42045; Fri, 21 Feb 2020 11:26:12 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.54.21]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 21 Feb 2020 11:26:12 +0000 (GMT) Subject: Re: [PATCH v3 00/37] KVM: s390: Add support for protected VMs To: David Hildenbrand , Janosch Frank , Andrew Morton Cc: KVM , Cornelia Huck , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , linux-s390 , Michael Mueller , Vasily Gorbik , Andrea Arcangeli , linux-mm@kvack.org References: <20200220104020.5343-1-borntraeger@de.ibm.com> <5556ee4a-09c6-117a-be99-4a5e136b78ea@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: <5556ee4a-09c6-117a-be99-4a5e136b78ea@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 20022111-4275-0000-0000-000003A42128 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20022111-4276-0000-0000-000038B8302F Message-Id: <0665a90a-19f2-39a8-8a48-d180a622e9f2@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-21_03:2020-02-19,2020-02-21 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 priorityscore=1501 mlxscore=0 adultscore=0 lowpriorityscore=0 bulkscore=0 impostorscore=0 phishscore=0 mlxlogscore=981 suspectscore=0 malwarescore=0 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002210087 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 21.02.20 11:54, David Hildenbrand wrote: > On 20.02.20 11:39, Christian Borntraeger wrote: >> mm people: This series contains a "pretty small" common code memory >> management change that will allow paging, guest backing with files etc >> almost just like normal VMs. It should be a no-op for all architecture= s >> not opting in. And it should be usable for others that also try to get >> notified on "the pages are in the process of being used for things lik= e >> I/O". This time I included error handling and an ACK from Will Deacon. >> >> mm-related patches CCed on linux-mm, the complete list can be found on >> the KVM and linux-s390 list.=20 >> >> Andrew, any chance to either take " mm:gup/writeback: add callbacks fo= r >> inaccessible pages" or ACK so that I can take it? >=20 > Summary: Mostly LGTM. Especially > - UAPI interface is minimal and clean > - Core MM changes are minimal and clean (and AFAIKT Andrea was involved > when discussing the approach, so it can't be wrong ;) ) > - Is no longer prototype quality ;) >=20 > There are still some things I want to double check (esp. how KVM memory > slots are handled - I somewhat dislike that we cannot replace/add new > ones while in PV. One would have to fence that somehow in QEMU as long > as the guest is in PV mode e.g., once we would support memory hotplug > ... but looks like this is what the HW requires us to enforce for now), > certain races, etc. but I assume these things could be fixed later on. In fact you can do that. The hardware checks the integrity on guest physi= cal address. So it is perfectly possible to remap a kvm slot as long as the e=C5=84crypted content matches what counter, guest content hash and guest= address tell. (It is like swapping, you move the encrypted content from one host=20 page to another).=20 For new pages (not unpacked and never touched by the guest) the ultraviso= r will bring a zeroed out page on first import. What does not work is when the user space address changes for a guest virtio indicator. But this was already broken before (we never did an adapter unmap/remap). >=20 > Can we get a new version once the other reviewers are done, so at least > I can have a final look? Just the updated patches as reply (e.g. a 3.2 for patch 9) or the full mo= nty?