AMD SEV: detect EFI CC Blob in loader#616
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In AMD SEV-SNP, a special page is allocated by the hypervisor to hold secret keys that can be used by the guest to communicate securely with the hardware. The hypervisor puts the address of this page in an area of the EFI Firmware, so we need to read it and forward it to Hermit so that it can use it.
Thanks @sarahspberrypi for the original implementation.