mdi_vhci
struct mdi_vhci value;
if (mdb_vread(&value, sizeof (struct mdi_vhci), addr) !=
sizeof (struct mdi_vhci)) {
struct mdi_vhci *vh_next; /* next vHCI link */
struct mdi_vhci *vh_prev; /* prev vHCI link */
struct mdi_vhci *ph_vhci; /* pHCI back ref. to vHCI */
struct mdi_vhci *ct_vhci; /* vHCI back ref */