[Qemu-devel] [PATCH v2 3/6] vhost: extend ring information update for IOTLB to all rings

[Maxime Coquelin]

Vhost-kernel backend need to receive IOTLB entry for used ring
information early, which is done by triggering a miss event on
its address.

This patch extends this behaviour to all rings information, to be
compatible with vhost-user backend design.

Signed-off-by: Maxime Coquelin <address@hidden>
---
v2:
 - Revert back to existing behaviour, i.e. only send IOTLB updates
at ring enablement time, not at ring address setting time (mst).
 - Extend IOTLB misses to all ring addresses, not only used ring.

 hw/virtio/vhost.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 6eddb09..7867034 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -1552,11 +1552,15 @@ int vhost_dev_start(struct vhost_dev *hdev, 
VirtIODevice *vdev)
     if (vhost_dev_has_iommu(hdev)) {
         hdev->vhost_ops->vhost_set_iotlb_callback(hdev, true);
 
-        /* Update used ring information for IOTLB to work correctly,
-         * vhost-kernel code requires for this.*/
+        /*
+         * Update rings information for IOTLB to work correctly,
+         * vhost-kernel and vhost-user codes require for this.
+         */
         for (i = 0; i < hdev->nvqs; ++i) {
             struct vhost_virtqueue *vq = hdev->vqs + i;
             vhost_device_iotlb_miss(hdev, vq->used_phys, true);
+            vhost_device_iotlb_miss(hdev, vq->desc_phys, true);
+            vhost_device_iotlb_miss(hdev, vq->avail_phys, true);
         }
     }
     return 0;
-- 
2.9.4