Hi Asias,
On Thu, 2013-03-28 at 10:17 +0800, Asias He wrote:
> This patch fixes guest hang when booting seabios and guest.
>
> [ 0.576238] scsi0 : Virtio SCSI HBA
> [ 0.616754] virtio_scsi virtio1: request:id 0 is not a head!
>
> vq->last_used_idx is initialized only when /dev/vhost-scsi is
> opened or closed.
>
> vhost_scsi_open -> vhost_dev_init() -> vhost_vq_reset()
> vhost_scsi_release() -> vhost_dev_cleanup -> vhost_vq_reset()
>
> So, when guest talks to tcm_vhost after seabios does, vq->last_used_idx
> still contains the old valule for seabios. This confuses guest.
>
> Fix this by calling vhost_init_used() to init vq->last_used_idx when
> we set endpoint.
>
> Signed-off-by: Asias He <as...@redhat.com>
> ---
> drivers/vhost/tcm_vhost.c | 9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
> index 43fb11e..5e3d4487 100644
> --- a/drivers/vhost/tcm_vhost.c
> +++ b/drivers/vhost/tcm_vhost.c
> @@ -781,8 +781,9 @@ static int vhost_scsi_set_endpoint(
> {
> struct tcm_vhost_tport *tv_tport;
> struct tcm_vhost_tpg *tv_tpg;
> + struct vhost_virtqueue *vq;
> bool match = false;
> - int index, ret;
> + int index, ret, i;
>
> mutex_lock(&vs->dev.mutex);
> /* Verify that ring has been setup correctly. */
> @@ -826,6 +827,12 @@ static int vhost_scsi_set_endpoint(
> if (match) {
> memcpy(vs->vs_vhost_wwpn, t->vhost_wwpn,
> sizeof(vs->vs_vhost_wwpn));
> + for (i = 0; i < VHOST_SCSI_MAX_VQ; i++) {
> + vq = &vs->vqs[i];
> + mutex_lock(&vq->mutex);
> + vhost_init_used(vq);
> + mutex_unlock(&vq->mutex);
> + }
Already tried a similar patch earlier today, but as vhost_init_used()
depends upon a vq->private_data being set it does not actually
re-initialize ->last_used_idx..
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