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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 18 Dec 2019 11:40:31 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xBIBeUUp51511492 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 18 Dec 2019 11:40:30 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AC0784C044; Wed, 18 Dec 2019 11:40:30 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0F3844C05A; Wed, 18 Dec 2019 11:40:30 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.119]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 18 Dec 2019 11:40:29 +0000 (GMT) Subject: Re: [PATCH v4 00/19] KVM: Dynamically size memslot arrays To: Sean Christopherson , James Hogan , Paul Mackerras , Janosch Frank , Paolo Bonzini , Marc Zyngier References: <20191217204041.10815-1-sean.j.christopherson@intel.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.0 MIME-Version: 1.0 In-Reply-To: <20191217204041.10815-1-sean.j.christopherson@intel.com> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 19121811-0016-0000-0000-000002D623BE X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19121811-0017-0000-0000-0000333861B2 Message-Id: <595b5ecc-d18b-3973-7041-59e58d7f1cc7@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-18_03:2019-12-17,2019-12-18 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 spamscore=0 clxscore=1015 impostorscore=0 mlxscore=0 adultscore=0 lowpriorityscore=0 suspectscore=0 bulkscore=0 mlxlogscore=999 priorityscore=1501 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912180097 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191218_034041_833950_B4D94D71 X-CRM114-Status: GOOD ( 26.30 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Christoffer Dall , Wanpeng Li , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= , kvm@vger.kernel.org, David Hildenbrand , Joerg Roedel , Cornelia Huck , linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org, linux-kernel@vger.kernel.org, James Morse , linux-arm-kernel@lists.infradead.org, Vitaly Kuznetsov , Suzuki K Poulose , kvmarm@lists.cs.columbia.edu, Julien Thierry , Jim Mattson Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 17.12.19 21:40, Sean Christopherson wrote: > The end goal of this series is to dynamically size the memslot array so > that KVM allocates memory based on the number of memslots in use, as > opposed to unconditionally allocating memory for the maximum number of > memslots. On x86, each memslot consumes 88 bytes, and so with 2 address > spaces of 512 memslots, each VM consumes ~90k bytes for the memslots. > E.g. given a VM that uses a total of 30 memslots, dynamic sizing reduces > the memory footprint from 90k to ~2.6k bytes. > > The changes required to support dynamic sizing are relatively small, > e.g. are essentially contained in patches 17/19 and 18/19. > > Patches 2-16 clean up the memslot code, which has gotten quite crusty, > especially __kvm_set_memory_region(). The clean up is likely not strictly > necessary to switch to dynamic sizing, but I didn't have a remotely > reasonable level of confidence in the correctness of the dynamic sizing > without first doing the clean up. > > The only functional change in v4 is the addition of an x86-specific bug > fix in x86's handling of KVM_MR_MOVE. The bug fix is not directly related > to dynamically allocating memslots, but it has subtle and hidden conflicts > with the cleanup patches, and the fix is higher priority than anything > else in the series, i.e. should be merged first. > > On non-x86 architectures, v3 and v4 should be functionally equivalent, > the only non-x86 change in v4 is the dropping of a "const" in > kvm_arch_commit_memory_region(). I gave this series a quick spin and it still seems to work on s390 (minus the selftest). _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel