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A comment on AMD PSB Vendor Locks EPYC CPUs for Enhanced Security at a Cost. Parent comment

Re:AMD PSB Vendor Locks EPYC CPUs for Enhanced Security at a... by SaltySolomon on Wednesday September 09, 2020 @03:30AM (#24418299)
Memory and Virtual Machines
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Re:AMD PSB Vendor Locks EPYC CPUs for Enhanced Security at a... by Dylan16807 on Wednesday September 09, 2020 @04:20AM (#24418662)
Please explain better.

The article talks about virtual machines as a subset of memory encryption. It also specifically says "ephemeral keys". Not ones that would be preserved across a shutdown.

What is encrypted on a powered-off server that the CPU knows the key to?

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