On Mon, 2013-04-08 at 10:10 +0300, Michael S. Tsirkin wrote: > On Wed, Apr 03, 2013 at 02:17:38PM +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 <asias@xxxxxxxxxx> > > Please apply for 3.9. > > Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx> > Applied to target-pending/master, and will be including both in the v3.9-rc7 PULL request. Thanks again! --nab > > --- > > drivers/vhost/tcm_vhost.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c > > index 11121ea..a10efd3 100644 > > --- a/drivers/vhost/tcm_vhost.c > > +++ b/drivers/vhost/tcm_vhost.c > > @@ -865,6 +865,7 @@ static int vhost_scsi_set_endpoint( > > /* Flushing the vhost_work acts as synchronize_rcu */ > > mutex_lock(&vq->mutex); > > rcu_assign_pointer(vq->private_data, vs_tpg); > > + vhost_init_used(vq); > > mutex_unlock(&vq->mutex); > > } > > ret = 0; > > -- > > 1.8.1.4 > -- > To unsubscribe from this list: send the line "unsubscribe target-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
