PCIR_SRIOV_NUM_VFS
IOV_WRITE(dinfo, PCIR_SRIOV_NUM_VFS, num_vfs, 2);
IOV_WRITE(dinfo, PCIR_SRIOV_NUM_VFS, iov->iov_num_vfs, 2);
IOV_WRITE(dinfo, PCIR_SRIOV_NUM_VFS, 0, 2);
num_vfs = read_config(fd, &p->pc_sel, ptr + PCIR_SRIOV_NUM_VFS, 2);