Commit 0d499356 authored by Michael S. Tsirkin's avatar Michael S. Tsirkin

vhost: fix barrier pairing

According to memory-barriers.txt, an smp memory barrier in guest
should always be paired with an smp memory barrier in host,
and I quote "a lack of appropriate pairing is almost certainly an
error". In case of vhost, failure to flush out used index
update before looking at the interrupt disable flag
could result in missed interrupts, resulting in
networking hang under stress.

This might happen when flags read bypasses used index write.
So we see interrupts disabled and do not interrupt, at the
same time guest writes flags value to enable interrupt,
reads an old used index value, thinks that
used ring is empty and waits for interrupt.

Note: the barrier we pair with here is in
drivers/virtio/virtio_ring.c, function
Signed-off-by: default avatarMichael S. Tsirkin <>
Acked-by: default avatarJuan Quintela <>
parent de02d72b
......@@ -1035,7 +1035,12 @@ int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len)
/* This actually signals the guest, using eventfd. */
void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq)
__u16 flags = 0;
__u16 flags;
/* Flush out used index updates. This is paired
* with the barrier that the Guest executes when enabling
* interrupts. */
if (get_user(flags, &vq->avail->flags)) {
vq_err(vq, "Failed to get flags");
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