Permit the use of restricted injection in the SVSM to enhance security #198
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Since the set of defined SEV features can change over time, it is not possible for the code to stay current with the set of features that should not be supported. Instead, it is safer for the code to enumerate the set of features that can be supported, with the assumption that any unknown feature must be rejected. BTB isolation and debug register isolation offer security and do not have any impact to software functionality so they can safely be accepted if present. Other features may require explicit software support. Signed-off-by: Jon Lange <jlange@microsoft.com>
Signed-off-by: Jon Lange <jlange@microsoft.com>
Signed-off-by: Jon Lange <jlange@microsoft.com>
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This change permits the use of restricted injection if enabled for the SVSM. When running from an IGVM file, restricted injection is always enabled.