AMD SEV-SNP Attestation
AMD Secure Encrypted Virtualization (SEV) - Secure Nested Paging (SNP)
链式信任:
AMD Root Key (ARK) -> AMD Signing Key (ASK) -> Versioned Chip Endorsement Key (VCEK)
VCEK 用于签发 attestation report，内容包含 Bootloader, TEE, SNP, Microcode, Chip ID。
支持基于TCB参数派生 DerivedKey 。