Re: [Qemu-devel] [PATCH 0/3] virtio: detach VirtQueueElements freed by reset

[Stefan Hajnoczi]

On Mon, Sep 19, 2016 at 02:28:02PM +0100, Stefan Hajnoczi wrote:
> virtio-blk and virtio-serial need to free VirtQueueElements during device
> reset.  Simply calling g_free(elem) is not enough because the scatter-gather
> list should be unmapped and vq->inuse must be decremented.
> 
> These patches address the issue.  I am not including a patch that changes
> vq->inuse = 0 to assert(!vq->inuse) in virtio_reset() yet because virtio-9p,
> virtio-gpu, and virtio-net have code paths that do not decrement vq->inuse.
> 
> Stefan Hajnoczi (3):
>   virtio: add virtio_detach_element()
>   virtio-blk: add missing virtio_detach_element() call
>   virtio-serial: add missing virtio_detach_element() call
> 
>  hw/block/virtio-blk.c       |  1 +
>  hw/char/virtio-serial-bus.c | 14 ++++++++++++++
>  hw/virtio/virtio.c          | 27 +++++++++++++++++++++++++--
>  include/hw/virtio/virtio.h  |  2 ++
>  4 files changed, 42 insertions(+), 2 deletions(-)

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