RDMA/mlx5: Use different doorbell memory for different processes

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In a fork scenario, the parent and child can have same virtual address and
also share the uverbs fd.  That causes to the list_for_each_entry search
return same doorbell physical page for all processes, even though that
page has been COW' or copied.

This patch takes the mm_struct into consideration during search, to make
sure that VA's belonging to different processes are not intermixed.

Resolves the malfunction of uverbs after fork in some specific cases.

Fixes: e126ba97db ("mlx5: Add driver for Mellanox Connect-IB adapters")
Link: https://lore.kernel.org/r/feacc23fe0bc6e1088c6824d5583798745e72405.1622726212.git.leonro@nvidia.com
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Mark Zhang <markzhang@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

...

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Mark Zhang 2021-06-03 16:18:03 +03:00 • committed by Jason Gunthorpe

parent a3e74fb924

commit a0ffb4c12f

1 changed files with 6 additions and 1 deletions

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7

drivers/infiniband/hw/mlx5/doorbell.c

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