From: Si-Wei Liu <si-wei.liu@xxxxxxxxxx>
When calculating the physical address range based on the iotlb and mr
[start,end) ranges, the offset of mr->start relative to map->start
is not taken into account. This leads to some incorrect and duplicate
mappings.
For the case when mr->start < map->start the code is already correct:
the range in [mr->start, map->start) was handled by a different
iteration.
Fixes: 94abbccdf291 ("vdpa/mlx5: Add shared memory registration code")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Si-Wei Liu <si-wei.liu@xxxxxxxxxx>
Signed-off-by: Dragos Tatulea <dtatulea@xxxxxxxxxx>
---
drivers/vdpa/mlx5/core/mr.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
index 2dd21e0b399e..7d0c83b5b071 100644
--- a/drivers/vdpa/mlx5/core/mr.c
+++ b/drivers/vdpa/mlx5/core/mr.c
@@ -373,7 +373,7 @@ static int map_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr
struct page *pg;
unsigned int nsg;
int sglen;
- u64 pa;
+ u64 pa, offset;
u64 paend;
struct scatterlist *sg;
struct device *dma = mvdev->vdev.dma_dev;
@@ -396,8 +396,10 @@ static int map_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr
sg = mr->sg_head.sgl;
for (map = vhost_iotlb_itree_first(iotlb, mr->start, mr->end - 1);
map; map = vhost_iotlb_itree_next(map, mr->start, mr->end - 1)) {
- paend = map->addr + maplen(map, mr);
- for (pa = map->addr; pa < paend; pa += sglen) {
+ offset = mr->start > map->start ? mr->start - map->start : 0;
+ pa = map->addr + offset;
+ paend = map->addr + offset + maplen(map, mr);
+ for (; pa < paend; pa += sglen) {
pg = pfn_to_page(__phys_to_pfn(pa));
if (!sg) {
mlx5_vdpa_warn(mvdev, "sg null. start 0x%llx, end 0x%llx\n",
--
2.46.1
