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a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=6IFa9wvqVegA:10 a=GoEa3M9JfhUA:10 a=qq2Dt-ZFRj5JlzehINwA:9 a=QEXdDO2ut3YA:10 cc=ntf awl=host:14714 X-Proofpoint-GUID: T0SYQjVTo2m6lTFtEUETnqSQKJj_oOw- X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjA0MDEwMSBTYWx0ZWRfX8kUEwu1Dwu3I OMyCOoK6+elXW6p3epPmb8yWF0D1K/IfvqxUdbvzLcIQ7C51wqsyC0kbfZg6NrnykT4PhkD3SBB CRj4pkJcC4oBojK+d/3Y5pPv7+0sx+x+k3nCifsnagBXm7WeIpQThGHYI6EyLjCCP2ZFWRo217C Jx33zH2PUMd8ylj+sTgH3/ph5VBYOJYBomxF6UeVgzZaKmuMyXC57gNQotaMWiVV4QLLpB3Mk8W TnAiaNIIOifkQFTalt0PxUH859lxUACJ7+YPodIBxqZ7x1YbbSRbTi7Tom06VGJpZ9TSa6K7E08 8wymSBSltXRm2fWbfktm21xHUb1zOM0WSP9hJo9ArfoURHbmjxWZZ/muV07GHRJs14hzblgSZaO upyFOx9C/F59ayqo3pVwDlGdMNg6z1PrytDVzzPncr40knDpgtDBcWM6JIJbZM6VRzNXduJI X-Proofpoint-ORIG-GUID: T0SYQjVTo2m6lTFtEUETnqSQKJj_oOw- On 04-06-2025 06:13, Roman Kisel wrote: > +Confidential VMBus is an extension of Confidential Computing (CoCo) VMs > +(a.k.a. "Isolated" VMs in Hyper-V terminology). Without Confidential VMBus, > +guest VMBus device drivers (the "VSC"s in VMBus terminology) communicate > +with VMBus servers (the VSPs) running on the Hyper-V host. The > +communication must be through memory that has been decrypted so the > +host can access it. With Confidential VMBus, one or more of the VSPs reside > +in the trusted paravisor layer in the guest VM. Since the paravisor layer also > +operates in encrypted memory, the memory used for communication with > +such VSPs does not need to be decrypted and thereby exposed to the > +Hyper-V host. The paravisor is responsible for communicating securely > +with the Hyper-V host as necessary. In some cases (e.g. time synchonization, Typo synchonization -> synchronization > +key-value pairs exchange) the unencrypted data doesn't need to be communicated > +with the host at all, and a conventional VMBus connection suffices. Thanks, Alok