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| author | Michael S. Tsirkin <mst@redhat.com> | 2009-10-25 15:28:53 +0200 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-10-29 08:50:37 +1030 |
| commit | 2d61ba95034f1abbdec7729d52c740870a5eddb6 (patch) | |
| tree | ec51d4cba4240af6011f4fabfda06a21532761da /drivers/virtio | |
| parent | 0b22bd0ba0d500ab40e7673c591c594ec5447342 (diff) | |
| download | lwn-2d61ba95034f1abbdec7729d52c740870a5eddb6.tar.gz lwn-2d61ba95034f1abbdec7729d52c740870a5eddb6.zip | |
virtio: order used ring after used index read
On SMP guests, reads from the ring might bypass used index reads. This
causes guest crashes because host writes to used index to signal ring
data readiness. Fix this by inserting rmb before used ring reads.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index f53600580726..fbd2ecde93e4 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -285,6 +285,9 @@ static void *vring_get_buf(struct virtqueue *_vq, unsigned int *len) return NULL; } + /* Only get used array entries after they have been exposed by host. */ + rmb(); + i = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].id; *len = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].len; |