[RFC PATCH v2 4/4] virtio-net: pass Device-TLB enable/disable events to vhost

[Viktor Prutyanov <viktor@daynix.com>]

If vhost is enabled for virtio-net, Device-TLB enable/disable events
must be passed to vhost for proper IOMMU unmap flag selection.

Signed-off-by: Viktor Prutyanov <viktor@daynix.com>
---
 hw/net/vhost_net.c      | 11 +++++++++++
 hw/net/virtio-net.c     |  8 ++++++++
 include/net/vhost_net.h |  2 ++
 3 files changed, 21 insertions(+)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index c4eecc6f36..2364c8de99 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -552,6 +552,17 @@ int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu)
     return vhost_ops->vhost_net_set_mtu(&net->dev, mtu);
 }
 
+void vhost_net_toggle_device_iotlb(struct vhost_dev *dev, bool enable)
+{
+    const VhostOps *vhost_ops = dev->vhost_ops;
+
+    if (!vhost_ops->vhost_toggle_device_iotlb) {
+        return;
+    }
+
+    vhost_ops->vhost_toggle_device_iotlb(dev, enable);
+}
+
 void vhost_net_virtqueue_reset(VirtIODevice *vdev, NetClientState *nc,
                                int vq_index)
 {
diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
index 53e1c32643..e6851b885c 100644
--- a/hw/net/virtio-net.c
+++ b/hw/net/virtio-net.c
@@ -3843,6 +3843,13 @@ static struct vhost_dev *virtio_net_get_vhost(VirtIODevice *vdev)
     return &net->dev;
 }
 
+static void virtio_net_toggle_device_iotlb(VirtIODevice *vdev,
+                                           bool enable)
+{
+    if (vdev->vhost_started)
+        vhost_net_toggle_device_iotlb(virtio_net_get_vhost(vdev), enable);
+}
+
 static const VMStateDescription vmstate_virtio_net = {
     .name = "virtio-net",
     .minimum_version_id = VIRTIO_NET_VM_VERSION,
@@ -3948,6 +3955,7 @@ static void virtio_net_class_init(ObjectClass *klass, void *data)
     vdc->vmsd = &vmstate_virtio_net_device;
     vdc->primary_unplug_pending = primary_unplug_pending;
     vdc->get_vhost = virtio_net_get_vhost;
+    vdc->toggle_device_iotlb = virtio_net_toggle_device_iotlb;
 }
 
 static const TypeInfo virtio_net_info = {
diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h
index c37aba35e6..36d527f321 100644
--- a/include/net/vhost_net.h
+++ b/include/net/vhost_net.h
@@ -56,4 +56,6 @@ int vhost_net_virtqueue_restart(VirtIODevice *vdev, NetClientState *nc,
                                 int vq_index);
 
 void vhost_net_save_acked_features(NetClientState *nc);
+
+void vhost_net_toggle_device_iotlb(struct vhost_dev *dev, bool enable);
 #endif
-- 
2.35.1