Re: [PATCH v9 0/6] MAP_DIRECT for DAX userspace flush

On Mon, Oct 16, 2017 at 03:02:52PM +0300, Sagi Grimberg wrote:

But why should the kernel ever need to mangle the CQ? if a lease break
would deregister the MR the device is expected to generate remote
protection errors on its own.

The point is to avoid protection errors - hittles change over when the
DAX mapping changes like ODP does.

Theonly way to get there is to notify the app before the mappings
change.. Dan suggested having ibv_pollcq return this indication..

Jason