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 | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/vhost/tcm_vhost.c b/drivers/vhost/tcm_vhost.c
index 099feef..0524267 100644
--- a/drivers/vhost/tcm_vhost.c
+++ b/drivers/vhost/tcm_vhost.c
@@ -848,6 +848,7 @@ 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);
+ vhost_init_used(vq);
mutex_unlock(&vq->mutex);
}
ret = 0;
--
1.8.1.4
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