SVM_SELECTOR_P_SHIFT
#define SVM_SELECTOR_P_MASK (1 << SVM_SELECTOR_P_SHIFT)
var->present = (s->attrib >> SVM_SELECTOR_P_SHIFT) & 1;
s->attrib |= ((var->present & 1) && !var->unusable) << SVM_SELECTOR_P_SHIFT;
#define SVM_SELECTOR_P_MASK (1 << SVM_SELECTOR_P_SHIFT)