Commit ca0176ad authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Michael S. Tsirkin
Browse files

virtio: check for vring setup in virtio_queue_update_used_idx 



If the vring has not been set up, it is not necessary for vring_used_idx
to do anything (as is already the case when the caller is virtio_load).
This is harmless for now, but it will be a problem when the
MemoryRegionCache has not been set up.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 991976f7

hw/virtio/virtio.c

+3 −1
Original line number Diff line number Diff line
@@ -2156,8 +2156,10 @@ void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) 


void virtio_queue_update_used_idx(VirtIODevice *vdev, int n)

{

    if (vdev->vq[n].vring.desc) {

        vdev->vq[n].used_idx = vring_used_idx(&vdev->vq[n]);

    }

}



void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n)

{