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Subject[RFC 3/3] vdpa/mlx5: take iommu_lock at dup_iotlb
Date
Both iommu changes and lookup are protected by mlx5_vdpa_net->reslock at
this moment, but:
* These iotlb changes / queries are not in the fast data path.
* reslock belongs to netdev, while dup_iotlb seems generic.
* It's located in a different file than the lock it needs to hold

Justifies the lock acquisition.

Fixes: 5262912ef3cf ("vdpa/mlx5: Add support for control VQ and MAC setting")
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
drivers/vdpa/mlx5/core/mr.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
index 878ee94efa78..e9c8a7f8ee1d 100644
--- a/drivers/vdpa/mlx5/core/mr.c
+++ b/drivers/vdpa/mlx5/core/mr.c
@@ -454,13 +454,15 @@ static int dup_iotlb(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb *src)
{
struct vhost_iotlb_map *map;
u64 start = 0, last = ULLONG_MAX;
- int err;
+ int err = 0;
+
+ spin_lock(&mvdev->cvq.iommu_lock);

vhost_iotlb_reset(mvdev->cvq.iotlb);

if (!src) {
err = vhost_iotlb_add_range(mvdev->cvq.iotlb, start, last, start, VHOST_ACCESS_RW);
- return err;
+ goto out;
}

for (map = vhost_iotlb_itree_first(src, start, last); map;
@@ -468,9 +470,12 @@ static int dup_iotlb(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb *src)
err = vhost_iotlb_add_range(mvdev->cvq.iotlb, map->start, map->last,
map->addr, map->perm);
if (err)
- return err;
+ goto out;
}
- return 0;
+
+out:
+ spin_unlock(&mvdev->cvq.iommu_lock);
+ return err;
}

static void prune_iotlb(struct mlx5_vdpa_dev *mvdev)
--
2.31.1
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