linux-kernel - [PATCH] vdpa_sim: do not reset IOTLB during device reset

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Message-Id: <20200514072549.29694-1-jasowang@redhat.com>
Date:   Thu, 14 May 2020 15:25:49 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, jasowang@...hat.com,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] vdpa_sim: do not reset IOTLB during device reset

We reset IOTLB during device reset this breaks the assumption that the
mapping needs to be controlled via vDPA DMA ops explicitly in a
incremental way. So the networking will be broken after e.g a guest
reset.

Fix this by not resetting the IOTLB during device reset.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 7957d2d41fc4..cc5525743a25 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -119,8 +119,6 @@ static void vdpasim_reset(struct vdpasim *vdpasim)
 	for (i = 0; i < VDPASIM_VQ_NUM; i++)
 		vdpasim_vq_reset(&vdpasim->vqs[i]);
 
-	vhost_iotlb_reset(vdpasim->iommu);
-
 	vdpasim->features = 0;
 	vdpasim->status = 0;
 	++vdpasim->generation;
-- 
2.20.1