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This commit adds AMD SEV-SNP as a confidential guest option to the runtime. Information on required components such as OVMF, QEMU and a kernel supporting SEV-SNP are defined in the versions file and corresponding configs are added. Note: The CPU model 'host' provided by the current SNP-QEMU does not support all SNP capabilities yet, which is why this option is changed to EPYC-v4. Note: The guest's physical address space reduction specified with ReducedPhysBits is 1. Details are can be found in Section 15.34.6 here https://www.amd.com/system/files/TechDocs/24593.pdf Fixes #4437 Signed-off-by: Joana Pecholt <joana.pecholt@aisec.fraunhofer.de>