tcm_vhost: Initialize vq->last_used_idx when set endpoint
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@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index 6cda137..c127731 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -874,6 +874,7 @@
/* 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;