linux-kernel - [PATCH vhost 2/2] vdpa/mlx5: Fix suboptimal range on iotlb iteration

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Message-ID: <20241021134040.975221-3-dtatulea@nvidia.com>
Date: Mon, 21 Oct 2024 16:40:40 +0300
From: Dragos Tatulea <dtatulea@...dia.com>
To: "Michael S . Tsirkin" <mst@...hat.com>, <virtualization@...ts.linux.dev>,
	Si-Wei Liu <si-wei.liu@...cle.com>
CC: Dragos Tatulea <dtatulea@...dia.com>, Jason Wang <jasowang@...hat.com>,
	Eugenio Perez Martin <eperezma@...hat.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Gal Pressman <gal@...dia.com>, Parav Pandit
	<parav@...dia.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: [PATCH vhost 2/2] vdpa/mlx5: Fix suboptimal range on iotlb iteration

From: Si-Wei Liu <si-wei.liu@...cle.com>

The starting iova address to iterate iotlb map entry within a range
was set to an irrelevant value when passing to the itree_next()
iterator, although luckily it doesn't affect the outcome of finding
out the granule of the smallest iotlb map size. Fix the code to make
it consistent with the following for-loop.

Fixes: 94abbccdf291 ("vdpa/mlx5: Add shared memory registration code")
Signed-off-by: Si-Wei Liu <si-wei.liu@...cle.com>
Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
---
 drivers/vdpa/mlx5/core/mr.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
index 7d0c83b5b071..8455f08f5d40 100644
--- a/drivers/vdpa/mlx5/core/mr.c
+++ b/drivers/vdpa/mlx5/core/mr.c
@@ -368,7 +368,6 @@ static int map_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr
 	unsigned long lgcd = 0;
 	int log_entity_size;
 	unsigned long size;
-	u64 start = 0;
 	int err;
 	struct page *pg;
 	unsigned int nsg;
@@ -379,10 +378,9 @@ static int map_direct_mr(struct mlx5_vdpa_dev *mvdev, struct mlx5_vdpa_direct_mr
 	struct device *dma = mvdev->vdev.dma_dev;
 
 	for (map = vhost_iotlb_itree_first(iotlb, mr->start, mr->end - 1);
-	     map; map = vhost_iotlb_itree_next(map, start, mr->end - 1)) {
+	     map; map = vhost_iotlb_itree_next(map, mr->start, mr->end - 1)) {
 		size = maplen(map, mr);
 		lgcd = gcd(lgcd, size);
-		start += size;
 	}
 	log_entity_size = ilog2(lgcd);
 
-- 
2.46.1