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authorEli Cohen <elic@nvidia.com>2021-06-02 05:15:36 +0300
committerMichael S. Tsirkin <mst@redhat.com>2021-07-08 14:49:02 +0300
commitefa08cb468cdd67855f63f341eac5f5f9ac93370 (patch)
tree8f6b49119a58496c0a7221c90af202b4b169fc8c /drivers
parent1225c216d9542ed4883027d3af50035c35a7a03c (diff)
downloadlinux-efa08cb468cdd67855f63f341eac5f5f9ac93370.tar.xz
virtio/vdpa: clear the virtqueue state during probe
Clear the available index as part of the initialization process to clear and values that might be left from previous usage of the device. For example, if the device was previously used by vhost_vdpa and now probed by vhost_vdpa, you want to start with indices. Fixes: c043b4a8cf3b ("virtio: introduce a vDPA based transport") Signed-off-by: Eli Cohen <elic@nvidia.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20210602021536.39525-5-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Eli Cohen <elic@nvidia.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/virtio/virtio_vdpa.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index e28acf482e0c..e1a141135992 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -142,6 +142,8 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
struct vdpa_callback cb;
struct virtqueue *vq;
u64 desc_addr, driver_addr, device_addr;
+ /* Assume split virtqueue, switch to packed if necessary */
+ struct vdpa_vq_state state = {0};
unsigned long flags;
u32 align, num;
int err;
@@ -191,6 +193,19 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
goto err_vq;
}
+ /* reset virtqueue state index */
+ if (virtio_has_feature(vdev, VIRTIO_F_RING_PACKED)) {
+ struct vdpa_vq_state_packed *s = &state.packed;
+
+ s->last_avail_counter = 1;
+ s->last_avail_idx = 0;
+ s->last_used_counter = 1;
+ s->last_used_idx = 0;
+ }
+ err = ops->set_vq_state(vdpa, index, &state);
+ if (err)
+ goto err_vq;
+
ops->set_vq_ready(vdpa, index, 1);
vq->priv = info;