From dfd5d5692c7ddf27380511b80a3dc590acfc4eee Mon Sep 17 00:00:00 2001 From: Asias He Date: Wed, 3 Apr 2013 14:17:38 +0800 Subject: [PATCH] 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 Acked-by: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger --- 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 6cda137bb208..c127731b4230 100644 --- a/drivers/vhost/tcm_vhost.c +++ b/drivers/vhost/tcm_vhost.c @@ -874,6 +874,7 @@ 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;