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Fri, 16 Dec 2022 14:55:27 GMT Received: from smtpav05.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7C63358061; Fri, 16 Dec 2022 14:55:27 +0000 (GMT) Received: from smtpav05.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F22D158059; Fri, 16 Dec 2022 14:55:26 +0000 (GMT) Received: from [9.47.158.152] (unknown [9.47.158.152]) by smtpav05.wdc07v.mail.ibm.com (Postfix) with ESMTP; Fri, 16 Dec 2022 14:55:26 +0000 (GMT) Message-ID: <1ee8a9cb-ba2c-60d0-a150-9710270020b7@linux.ibm.com> Date: Fri, 16 Dec 2022 09:55:26 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1 Subject: Re: [PATCH 2/2] tpm: add backend for mssim Content-Language: en-US To: =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= Cc: jejb@linux.ibm.com, qemu-devel@nongnu.org, Markus Armbruster References: <77bc5a11fcb7b06deba1c54b1ef2de28e0c53fb1.camel@linux.ibm.com> <10fbda0f-7c8a-3819-fb22-34a9249ac138@linux.ibm.com> <9fac7d95-d891-413f-93f1-18324c7943ea@linux.ibm.com> <29e99f54-d5e8-b18d-08a6-d24435032272@linux.ibm.com> From: Stefan Berger In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: mMOWGHFhhroS9tAYM9-1qMdyBHCs72eL X-Proofpoint-ORIG-GUID: H6vJJWDIpNlvaQnqj0q1iElcrNCt4Mbp X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.923,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-12-16_08,2022-12-15_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 spamscore=0 mlxlogscore=789 mlxscore=0 phishscore=0 lowpriorityscore=0 adultscore=0 malwarescore=0 clxscore=1015 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2212160127 Received-SPF: pass client-ip=148.163.156.1; envelope-from=stefanb@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 12/16/22 09:29, Daniel P. Berrangé wrote: > > All the objections you're raising are related to the current > specifics of the implementation of the mssim remote server. > While valid, this is of no concern to QEMU when deciding whether > to require a migration blocker on the client side. This is 3rd > party remote service that should be considered a black box from > QEMU's POV. It is possible to write a remote server that supports > the mssim network protocol, and has the ability to serialize > its state. Whether such an impl exists today or not is separate. Then let's document the scenarios so someone can repeat them, I think this is just fair. James said he tested state migration scenarios and it works, so let's enable others to do it as well. I am open to someone maintaining just this driver and the dynamics that may develop around it. Regards, Stefan > With regards, > Daniel