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A guest may not be configured to support RDSEED, even when the host does. If the guest does not support RDSEED, intercept the instruction and synthesize #UD. Also clear the "allowed-1" bit for RDSEED exiting in the IA32_VMX_PROCBASED_CTLS2 MSR. Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>