Comment 9 for bug 1703339

The intended use for VMD is as a PCIe storage domain, so we expect only to see root ports, switches and NVMe SSDs in the VMD domain.

Linux VMD is implemented just as a PCIe host bridge driver in order to reuse existing device drivers, though, so you could theoretically connect any pci device in the domain. The drivers for those devices do not need to be aware that it is part of a VMD domain, and it does indeed work, but we don't support such usage at this time.