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Thu, 15 Dec 2022 20:53:44 GMT Received: from smtpav04.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5B3245804E; Thu, 15 Dec 2022 20:53:44 +0000 (GMT) Received: from smtpav04.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C191F58062; Thu, 15 Dec 2022 20:53:43 +0000 (GMT) Received: from [9.47.158.152] (unknown [9.47.158.152]) by smtpav04.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 15 Dec 2022 20:53:43 +0000 (GMT) Message-ID: <29e99f54-d5e8-b18d-08a6-d24435032272@linux.ibm.com> Date: Thu, 15 Dec 2022 15:53:43 -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: jejb@linux.ibm.com, qemu-devel@nongnu.org Cc: =?UTF-8?Q?Daniel_P_=2e_Berrang=c3=a9?= , Markus Armbruster References: <20221215180125.24632-1-jejb@linux.ibm.com> <20221215180125.24632-3-jejb@linux.ibm.com> <6fd1144d09777ddcdb7a1a1ba58cbbec345da9ef.camel@linux.ibm.com> <77bc5a11fcb7b06deba1c54b1ef2de28e0c53fb1.camel@linux.ibm.com> <10fbda0f-7c8a-3819-fb22-34a9249ac138@linux.ibm.com> <9fac7d95-d891-413f-93f1-18324c7943ea@linux.ibm.com> From: Stefan Berger In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: LxiPdcvKFvcALboBLtDONE_4qR0UcoIa X-Proofpoint-ORIG-GUID: UgORSXedT7rJNVhTkV8uE7ielMQ_58Il 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=2022-12-15_11,2022-12-15_02,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 suspectscore=0 lowpriorityscore=0 phishscore=0 impostorscore=0 mlxscore=0 adultscore=0 mlxlogscore=759 spamscore=0 priorityscore=1501 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2212150172 Received-SPF: pass client-ip=148.163.158.5; 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 12/15/22 15:30, James Bottomley wrote: > On Thu, 2022-12-15 at 15:22 -0500, Stefan Berger wrote: >> On 12/15/22 15:07, James Bottomley wrote: > [...] >>> don't really have much interest in the migration use case, but I >>> knew it should work like the passthrough case, so that's what I >>> tested. >> >> I think your device needs to block migrations since it doesn't handle >> all migration scenarios correctly. > > Passthrough doesn't block migrations either, presumably because it can > also be made to work if you know what you're doing. I might not be Don't compare it to passthrough, compare it to swtpm. It should have at least the same features as swtpm or be better, otherwise I don't see why we need to have the backend device in the upstream repo. Stefan