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The VMSA files contain the expected CPU register state for the VM. Their content varies based on a few pieces of the stack - AMD CPU architectural initial state - KVM hypervisor VM CPU initialization - QEMU userspace VM CPU initialization - AMD CPU SKU (family/model/stepping) The first three pieces of information we can obtain through code inspection. The last piece of information we can take on the command line. This allows a user to validate a SEV-ES guest merely by providing the CPU SKU information, using --cpu-family, --cpu-model, --cpu-stepping. This avoids the need to obtain or construct VMSA files directly. Reviewed-by: Cole Robinson <crobinso@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>