VMD_CFGBAR
vmd->cfgbar = pcim_iomap(dev, VMD_CFGBAR, 0);
if (offset + len >= resource_size(&vmd->dev->resource[VMD_CFGBAR]))
res = &vmd->dev->resource[VMD_CFGBAR];
if (resource_size(&dev->resource[VMD_CFGBAR]) < (1 << 20))