[Users] physical memory registration

[evam]

I understood following steps for register physical memory region verb as defined
in InfiniBand specification

step 1: Allocate kernel memory using kmalloc etc. Return address is a kernel
virtual address. Allocate multiple buffers.
step 2: Get corresponding physical addressess of buffers returned in step 1
step 3: Give the physical addresses as 'addr' inputs to physical buffer list
structure ib_phys_buf as defined in ofed
step 4: GIve sizes of allocated buffers as 'size' inputs to physical buffer list
structure ib_phys_buf as defined in ofed
step 5: Request an iova to be used as an address for posting operations. iova
can be any arbitrary address.

Please check if the above understanding is correct whether iova to be provided
is a physical address or virtual address ?
Does iova give one single reference to all physical buffers in physical buffer
list to consumer ?

Please give some pointers for understanding of physical memory registrations
apart from IB-specification

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