[PATCH net V3 0/3] Fix various issue of vhost

[Jason Wang]

Hi:

This series tries to fix various issues of vhost:

- Patch 1 adds a missing write barrier between used idx updating and
  logging.
- Patch 2-3 brings back the protection of device IOTLB through vq
  mutex, this fixes possible use after free in device IOTLB entries.

Please consider them for -stable.

Thanks

Changes from V2:
- drop dirty page fix and make it for net-next
Changes from V1:
- silent compiler warning for 32bit.
- use mutex_trylock() on slowpath instead of mutex_lock() even on fast
  path.

Jason Wang (3):
  vhost: make sure used idx is seen before log in vhost_add_used_n()
  vhost_net: switch to use mutex_trylock() in vhost_net_busy_poll()
  Revert "net: vhost: lock the vqs one by one"

 drivers/vhost/net.c   |  8 +++++++-
 drivers/vhost/vhost.c | 23 +++++++++++++++++++----
 2 files changed, 26 insertions(+), 5 deletions(-)

-- 
2.17.1