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vhost: move iova_tree set to vhost_svq_start 

Since we don't know if we will use SVQ at qemu initialization, let's
allocate iova_tree only if needed. To do so, accept it at SVQ start, not
at initialization.

This will avoid to create it if the device does not support SVQ.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20221215113144.322011-5-eperezma@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Eugenio Pérez 2022-12-15 12:31:36 +01:00 committed by Michael S. Tsirkin
parent 3cfb4d069c
commit 5fde952bbd
3 changed files with 8 additions and 11 deletions
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9
hw/virtio/vhost-shadow-virtqueue.c
View File

@ -642,9 +642,10 @@ void vhost_svq_set_svq_kick_fd(VhostShadowVirtqueue *svq, int svq_kick_fd)
* @svq: Shadow Virtqueue
* @vdev: VirtIO device
* @vq: Virtqueue to shadow
* @iova_tree: Tree to perform descriptors translations
*/
void vhost_svq_start(VhostShadowVirtqueue *svq, VirtIODevice *vdev,
VirtQueue *vq)
VirtQueue *vq, VhostIOVATree *iova_tree)
{
size_t desc_size, driver_size, device_size;
@ -655,6 +656,7 @@ void vhost_svq_start(VhostShadowVirtqueue *svq, VirtIODevice *vdev,
svq->last_used_idx = 0;
svq->vdev = vdev;
svq->vq = vq;
svq->iova_tree = iova_tree;
svq->vring.num = virtio_queue_get_num(vdev, virtio_get_queue_index(vq));
driver_size = vhost_svq_driver_area_size(svq);
@ -712,18 +714,15 @@ void vhost_svq_stop(VhostShadowVirtqueue *svq)
* Creates vhost shadow virtqueue, and instructs the vhost device to use the
* shadow methods and file descriptors.
*
* @iova_tree: Tree to perform descriptors translations
* @ops: SVQ owner callbacks
* @ops_opaque: ops opaque pointer
*/
VhostShadowVirtqueue *vhost_svq_new(VhostIOVATree *iova_tree,
const VhostShadowVirtqueueOps *ops,
VhostShadowVirtqueue *vhost_svq_new(const VhostShadowVirtqueueOps *ops,
void *ops_opaque)
{
VhostShadowVirtqueue *svq = g_new0(VhostShadowVirtqueue, 1);
event_notifier_init_fd(&svq->svq_kick, VHOST_FILE_UNBIND);
svq->iova_tree = iova_tree;
svq->ops = ops;
svq->ops_opaque = ops_opaque;
return svq;

5
hw/virtio/vhost-shadow-virtqueue.h
View File

@ -126,11 +126,10 @@ size_t vhost_svq_driver_area_size(const VhostShadowVirtqueue *svq);
size_t vhost_svq_device_area_size(const VhostShadowVirtqueue *svq);
void vhost_svq_start(VhostShadowVirtqueue *svq, VirtIODevice *vdev,
VirtQueue *vq);
VirtQueue *vq, VhostIOVATree *iova_tree);
void vhost_svq_stop(VhostShadowVirtqueue *svq);
VhostShadowVirtqueue *vhost_svq_new(VhostIOVATree *iova_tree,
const VhostShadowVirtqueueOps *ops,
VhostShadowVirtqueue *vhost_svq_new(const VhostShadowVirtqueueOps *ops,
void *ops_opaque);
void vhost_svq_free(gpointer vq);

5
hw/virtio/vhost-vdpa.c
View File

@ -430,8 +430,7 @@ static int vhost_vdpa_init_svq(struct vhost_dev *hdev, struct vhost_vdpa *v,
for (unsigned n = 0; n < hdev->nvqs; ++n) {
VhostShadowVirtqueue *svq;
svq = vhost_svq_new(v->iova_tree, v->shadow_vq_ops,
v->shadow_vq_ops_opaque);
svq = vhost_svq_new(v->shadow_vq_ops, v->shadow_vq_ops_opaque);
g_ptr_array_add(shadow_vqs, svq);
}
@ -1063,7 +1062,7 @@ static bool vhost_vdpa_svqs_start(struct vhost_dev *dev)
goto err;
}
vhost_svq_start(svq, dev->vdev, vq);
vhost_svq_start(svq, dev->vdev, vq, v->iova_tree);
ok = vhost_vdpa_svq_map_rings(dev, svq, &addr, &err);
if (unlikely(!ok)) {
goto err_map;