RDMA/mlx5: Enforce umem boundaries for explicit ODP page faults

[ Upstream commit 8c6d097d ]

The new memory scheme page faults are requesting the driver to fetch
additinal pages to the faulted memory access.
This is done in order to prefetch pages before and after the area that
got the page fault, assuming this will reduce the total amount of page
faults.

The driver should ensure it handles only the pages that are within the
umem range.

Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/20240909100504.29797-5-michaelgur@nvidia.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>