diff options
Diffstat (limited to 'hw/virtio')
| -rw-r--r-- | hw/virtio/vhost.c | 10 | ||||
| -rw-r--r-- | hw/virtio/virtio.c | 24 |
2 files changed, 28 insertions, 6 deletions
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index ddc42f0..e4290ce 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -493,21 +493,21 @@ static int vhost_verify_ring_mappings(struct vhost_dev *dev, j = 0; r = vhost_verify_ring_part_mapping(dev, vq->desc, vq->desc_phys, vq->desc_size, start_addr, size); - if (!r) { + if (r) { break; } j++; r = vhost_verify_ring_part_mapping(dev, vq->avail, vq->avail_phys, vq->avail_size, start_addr, size); - if (!r) { + if (r) { break; } j++; r = vhost_verify_ring_part_mapping(dev, vq->used, vq->used_phys, vq->used_size, start_addr, size); - if (!r) { + if (r) { break; } } @@ -1138,6 +1138,10 @@ static void vhost_virtqueue_stop(struct vhost_dev *dev, r = dev->vhost_ops->vhost_get_vring_base(dev, &state); if (r < 0) { VHOST_OPS_DEBUG("vhost VQ %d ring restore failed: %d", idx, r); + /* Connection to the backend is broken, so let's sync internal + * last avail idx to the device used idx. + */ + virtio_queue_restore_last_avail_idx(vdev, idx); } else { virtio_queue_set_last_avail_idx(vdev, idx, state.num); } diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index ea532dc..ad564b0 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -182,7 +182,7 @@ void virtio_queue_update_rings(VirtIODevice *vdev, int n) { VRing *vring = &vdev->vq[n].vring; - if (!vring->desc) { + if (!vring->num || !vring->desc || !vring->align) { /* not yet setup -> nothing to do */ return; } @@ -1414,6 +1414,9 @@ void virtio_config_modern_writel(VirtIODevice *vdev, void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr) { + if (!vdev->vq[n].vring.num) { + return; + } vdev->vq[n].vring.desc = addr; virtio_queue_update_rings(vdev, n); } @@ -1426,6 +1429,9 @@ hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n) void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc, hwaddr avail, hwaddr used) { + if (!vdev->vq[n].vring.num) { + return; + } vdev->vq[n].vring.desc = desc; vdev->vq[n].vring.avail = avail; vdev->vq[n].vring.used = used; @@ -1494,8 +1500,10 @@ void virtio_queue_set_align(VirtIODevice *vdev, int n, int align) */ assert(k->has_variable_vring_alignment); - vdev->vq[n].vring.align = align; - virtio_queue_update_rings(vdev, n); + if (align) { + vdev->vq[n].vring.align = align; + virtio_queue_update_rings(vdev, n); + } } static bool virtio_queue_notify_aio_vq(VirtQueue *vq) @@ -2310,6 +2318,16 @@ void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) vdev->vq[n].shadow_avail_idx = idx; } +void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n) +{ + rcu_read_lock(); + if (vdev->vq[n].vring.desc) { + vdev->vq[n].last_avail_idx = vring_used_idx(&vdev->vq[n]); + vdev->vq[n].shadow_avail_idx = vdev->vq[n].last_avail_idx; + } + rcu_read_unlock(); +} + void virtio_queue_update_used_idx(VirtIODevice *vdev, int n) { rcu_read_lock(); |