PCIR_SRIOV_PAGE_SIZE
IOV_WRITE(dinfo, PCIR_SRIOV_PAGE_SIZE, page_size, 4);
IOV_WRITE(dinfo, PCIR_SRIOV_PAGE_SIZE, iov->iov_page_size, 4);
iov->iov_page_size = IOV_READ(dinfo, PCIR_SRIOV_PAGE_SIZE, 4);
page_size = read_config(fd, &p->pc_sel, ptr + PCIR_SRIOV_PAGE_SIZE, 4);