Re: [PATCH] vhost: fix initialization for vq->is_le

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On 2017年01月30日 18:09, Halil Pasic wrote:
Currently, under certain circumstances vhost_init_is_le does just a part
of the initialization job, and depends on vhost_reset_is_le being called
too. For this reason vhost_vq_init_access used to call vhost_reset_is_le
when vq->private_data is NULL. This is not only counter intuitive, but
also real a problem because it breaks vhost_net. The bug was introduced to
vhost_net with commit 2751c9882b94 ("vhost: cross-endian support for
legacy devices"). The symptom is corruption of the vq's used.idx field
(virtio) after VHOST_NET_SET_BACKEND was issued as a part of the vhost
shutdown on a vq with pending descriptors.

Let us make sure the outcome of vhost_init_is_le never depend on the state
it is actually supposed to initialize, and fix virtio_net by removing the
reset from vhost_vq_init_access.

With the above, there is no reason for vhost_reset_is_le to do just half
of the job. Let us make vhost_reset_is_le reinitialize is_le.

Signed-off-by: Halil Pasic <pasic@xxxxxxxxxxxxxxxxxx>
Reported-by: Michael A. Tebolt <miket@xxxxxxxxxx>
Reported-by: Dr. David Alan Gilbert <dgilbert@xxxxxxxxxx>
Fixes: commit 2751c9882b94 ("vhost: cross-endian support for legacy devices")
---

The bug was already discussed here:
http://www.spinics.net/lists/kvm/msg144365.html
This is a follow up patch.

---
  drivers/vhost/vhost.c | 10 ++++------
  1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index d643260..8f99fe0 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -130,14 +130,14 @@ static long vhost_get_vring_endian(struct vhost_virtqueue *vq, u32 idx,
static void vhost_init_is_le(struct vhost_virtqueue *vq)
  {
-	if (vhost_has_feature(vq, VIRTIO_F_VERSION_1))
-		vq->is_le = true;
+	vq->is_le = vhost_has_feature(vq, VIRTIO_F_VERSION_1)
+		|| virtio_legacy_is_little_endian();
  }
  #endif /* CONFIG_VHOST_CROSS_ENDIAN_LEGACY */
static void vhost_reset_is_le(struct vhost_virtqueue *vq)
  {
-	vq->is_le = virtio_legacy_is_little_endian();
+	vhost_init_is_le(vq);
  }
struct vhost_flush_struct {
@@ -1714,10 +1714,8 @@ int vhost_vq_init_access(struct vhost_virtqueue *vq)
  	int r;
  	bool is_le = vq->is_le;
- if (!vq->private_data) {
-		vhost_reset_is_le(vq);
+	if (!vq->private_data)
  		return 0;
-	}
vhost_init_is_le(vq);

Acked-by: Jason Wang <jasowang@xxxxxxxxxx>

We can probably just drop vhost_reset_is_le() and just use vhost_init_is_le() instead.

Thanks
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