diff options
Diffstat (limited to 'hw/virtio/virtio.c')
| -rw-r--r-- | hw/virtio/virtio.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index d4e4d98b59..f6a588ab57 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2006,14 +2006,25 @@ static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val) int virtio_set_features(VirtIODevice *vdev, uint64_t val) { - /* + int ret; + /* * The driver must not attempt to set features after feature negotiation * has finished. */ if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) { return -EINVAL; } - return virtio_set_features_nocheck(vdev, val); + ret = virtio_set_features_nocheck(vdev, val); + if (!ret && virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) { + /* VIRTIO_RING_F_EVENT_IDX changes the size of the caches. */ + int i; + for (i = 0; i < VIRTIO_QUEUE_MAX; i++) { + if (vdev->vq[i].vring.num != 0) { + virtio_init_region_cache(vdev, i); + } + } + } + return ret; } int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id) |