On Wed, Nov 23, 2016 at 10:40:47AM -0800, Dan Williams wrote:
I don't think that was designed for the case where the backing
is a special/static physical address range rather than anonymous
"System RAM", right?
The hardware doesn't care where the memory is. ODP is just a generic
mechanism to provide demand-fault behavior for a mirrored page table.
ODP has the same issue as everything else, it needs to translate a
page table entry into a DMA address, and we have no API to do that
when the page table points to peer-peer memory.