SM_CAP_MASK_IS_VM_SUPPD
if (portinfo.CapabilityMask & SM_CAP_MASK_IS_VM_SUPPD)
capmask &= ~SM_CAP_MASK_IS_VM_SUPPD;
capmask |= SM_CAP_MASK_IS_VM_SUPPD;
if (portinfo.CapabilityMask & SM_CAP_MASK_IS_VM_SUPPD)
capmask &= ~SM_CAP_MASK_IS_VM_SUPPD;
capmask |= SM_CAP_MASK_IS_VM_SUPPD;