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Tue, 15 Nov 2022 08:42:37 +0000 (GMT) Received: from [9.171.74.64] (unknown [9.171.74.64]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 15 Nov 2022 08:42:37 +0000 (GMT) Message-ID: Date: Tue, 15 Nov 2022 09:42:36 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.1 Subject: Re: [PATCH v16 0/6] KVM: s390: pv: implement lazy destroy for reboot Content-Language: en-US To: Claudio Imbrenda , kvm@vger.kernel.org Cc: borntraeger@de.ibm.com, thuth@redhat.com, david@redhat.com, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, scgl@linux.ibm.com, seiden@linux.ibm.com, nrb@linux.ibm.com References: <20221111170632.77622-1-imbrenda@linux.ibm.com> From: Janosch Frank In-Reply-To: <20221111170632.77622-1-imbrenda@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 9naloPUGpkJo60TRCQomBLb-eJJdilWU X-Proofpoint-ORIG-GUID: 3M_XFSOX-aPVB799sh7uUNtn4NcWO0jW X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-15_04,2022-11-11_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1011 malwarescore=0 spamscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 mlxlogscore=816 impostorscore=0 bulkscore=0 priorityscore=1501 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211150058 Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org On 11/11/22 18:06, Claudio Imbrenda wrote: > Previously, when a protected VM was rebooted or when it was shut down, > its memory was made unprotected, and then the protected VM itself was > destroyed. Looping over the whole address space can take some time, > considering the overhead of the various Ultravisor Calls (UVCs). This > means that a reboot or a shutdown would take a potentially long amount > of time, depending on the amount of used memory. > Well, this was a journey :) Thanks, picked