I was testing with a main focus on uefistored and the Secure Boot support. I'm happy to report that my one secureboot VM¹ started up with full signature checking and everything. This is with a custom/in-house PK.
Additional test cases:
- Export UEFI secureboot VM to OVA and re-importing it: SUCCESS
- Copying a secureboot VM within the same pool: SUCCESS
In both cases, the new VM successfully verified the bootloader.
¹ I had loaded my PK, KEK and db and enabled secureboot before the uefistored update, as I was already experimenting with secureboot.