VMCB_INTCPT_IRET
blocked = svm_get_intercept(vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_IRET);
svm_enable_intercept(vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_IRET);
svm_disable_intercept(vcpu, VMCB_CTRL1_INTCPT, VMCB_INTCPT_IRET);