HV_PAGE_ALIGN
#define HV_BYTES_TO_PAGES(x) (HV_PAGE_ALIGN(x) >> HV_PAGE_SHIFT)
length = HV_PAGE_ALIGN(length);
if (length == 0 || length != HV_PAGE_ALIGN(length))
if (txLength == 0 || rxLength == 0 || txLength != HV_PAGE_ALIGN(txLength)
|| rxLength != HV_PAGE_ALIGN(rxLength))