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igvm and sev_snp only need the MSHV backend when a caller selects that backend. Stop enabling mshv implicitly from those top-level features so KVM SEV-SNP builds do not compile unused MSHV backend code. Require igvm and sev_snp to be built with kvm or mshv. Backend-less configurations having no runtime hypervisor are not supported. Assisted-by: Copilot:GPT-5.5 Signed-off-by: Wei Liu <liuwe@microsoft.com>