Re: [PATCH] virtio_balloon: fix up endian-ness for free cmd id

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On 07/28/2020 12:03 AM, Michael S. Tsirkin wrote:
free cmd id is read using virtio endian, spec says all fields
in balloon are LE. Fix it up.

Fixes: 86a559787e6f ("virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
---
  drivers/virtio/virtio_balloon.c | 6 +++++-
  1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 774deb65a9bb..798ec304fe3e 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -578,10 +578,14 @@ static int init_vqs(struct virtio_balloon *vb)
  static u32 virtio_balloon_cmd_id_received(struct virtio_balloon *vb)
  {
  	if (test_and_clear_bit(VIRTIO_BALLOON_CONFIG_READ_CMD_ID,
-			       &vb->config_read_bitmap))
+			       &vb->config_read_bitmap)) {
  		virtio_cread(vb->vdev, struct virtio_balloon_config,
  			     free_page_hint_cmd_id,
  			     &vb->cmd_id_received_cache);
+		/* Legacy balloon config space is LE, unlike all other devices. */
+		if (!virtio_has_feature(vb->vdev, VIRTIO_F_VERSION_1))
+			vb->cmd_id_received_cache = le32_to_cpu((__force __le32)vb->cmd_id_received_cache);
Seems it exceeds 80 character length.

Reviewed-by: Wei Wang <wei.w.wang@xxxxxxxxx>

Best,
Wei
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