The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 1abe186ed8a6593069bc122da55fc684383fdc1c Mon Sep 17 00:00:00 2001
From: Moni Shoua <monis@xxxxxxxxxxxx>
Date: Tue, 19 Mar 2019 11:24:36 +0200
Subject: [PATCH] IB/mlx5: Reset access mask when looping inside page fault
handler
If page-fault handler spans multiple MRs then the access mask needs to
be reset before each MR handling or otherwise write access will be
granted to mapped pages instead of read-only.
Cc: <stable@xxxxxxxxxxxxxxx> # 3.19
Fixes: 7bdf65d411c1 ("IB/mlx5: Handle page faults")
Reported-by: Jerome Glisse <jglisse@xxxxxxxxxx>
Signed-off-by: Moni Shoua <monis@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
diff --git a/drivers/infiniband/hw/mlx5/odp.c b/drivers/infiniband/hw/mlx5/odp.c
index c20bfc41ecf1..0aa10ebda5d9 100644
--- a/drivers/infiniband/hw/mlx5/odp.c
+++ b/drivers/infiniband/hw/mlx5/odp.c
@@ -585,7 +585,7 @@ static int pagefault_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr,
struct ib_umem_odp *odp_mr = to_ib_umem_odp(mr->umem);
bool downgrade = flags & MLX5_PF_FLAGS_DOWNGRADE;
bool prefetch = flags & MLX5_PF_FLAGS_PREFETCH;
- u64 access_mask = ODP_READ_ALLOWED_BIT;
+ u64 access_mask;
u64 start_idx, page_mask;
struct ib_umem_odp *odp;
size_t size;
@@ -607,6 +607,7 @@ static int pagefault_mr(struct mlx5_ib_dev *dev, struct mlx5_ib_mr *mr,
page_shift = mr->umem->page_shift;
page_mask = ~(BIT(page_shift) - 1);
start_idx = (io_virt - (mr->mmkey.iova & page_mask)) >> page_shift;
+ access_mask = ODP_READ_ALLOWED_BIT;
if (prefetch && !downgrade && !mr->umem->writable) {
/* prefetch with write-access must
