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target/i386: SEV: use KVM_SEV_INIT2 if possible
Implement support for the KVM_X86_SEV_VM and KVM_X86_SEV_ES_VM virtual machine types, and the KVM_SEV_INIT2 function of KVM_MEMORY_ENCRYPT_OP. These replace the KVM_SEV_INIT and KVM_SEV_ES_INIT functions, and have several advantages: - sharing the initialization sequence with SEV-SNP and TDX - allowing arguments including the set of desired VMSA features - protection against invalid use of KVM_GET/SET_* ioctls for guests with encrypted state If the KVM_X86_SEV_VM and KVM_X86_SEV_ES_VM types are not supported, fall back to KVM_SEV_INIT and KVM_SEV_ES_INIT (which use the default x86 VM type). Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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