linux-kernel - [RFC 1/3] vdpa/mlx5: reset iotlb at dup

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Message-Id: <20230112142218.725622-2-eperezma@redhat.com>
Date:   Thu, 12 Jan 2023 15:22:16 +0100
From:   Eugenio Pérez <eperezma@...hat.com>
To:     mst@...hat.com, elic@...dia.com
Cc:     linux-kernel@...r.kernel.org, parav@...dia.com, lulu@...hat.com,
        jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        sgarzare@...hat.com, si-wei.liu@...cle.com
Subject: [RFC 1/3] vdpa/mlx5: reset iotlb at dup_iotlb

Regular memory region changes already reset cvq iotlb at set_map.
However this is not true if CVQ and data VQs are in different ASID.

Clean the CVQ iotlb every time we hit dup_iotlb.

Fixes: 8fcd20c30704 ("vdpa/mlx5: Support different address spaces for control and data")
Signed-off-by: Eugenio Pérez <eperezma@...hat.com>
---
 drivers/vdpa/mlx5/core/mr.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/vdpa/mlx5/core/mr.c b/drivers/vdpa/mlx5/core/mr.c
index 0a1e0b0dc37e..ae34dcac9a3f 100644
--- a/drivers/vdpa/mlx5/core/mr.c
+++ b/drivers/vdpa/mlx5/core/mr.c
@@ -456,6 +456,8 @@ static int dup_iotlb(struct mlx5_vdpa_dev *mvdev, struct vhost_iotlb *src)
 	u64 start = 0, last = ULLONG_MAX;
 	int err;
 
+	vhost_iotlb_reset(mvdev->cvq.iotlb);
+
 	if (!src) {
 		err = vhost_iotlb_add_range(mvdev->cvq.iotlb, start, last, start, VHOST_ACCESS_RW);
 		return err;
-- 
2.31.1