nvme_mem_vtophys
nvme_mem_vtophys(*mapped_addr), B_WRITE_COMBINING_MEMORY);
*paddr = nvme_mem_vtophys(address);
phys_addr_t nvme_mem_vtophys(void* vaddr);
phys_addr = nvme_mem_vtophys(payload);
tr->req->cmd.mptr = nvme_mem_vtophys(md_payload);
tr->req->cmd.dptr.prp.prp2 = nvme_mem_vtophys(seg_addr);
phys_addr = nvme_mem_vtophys(seg_addr);