This series aims at specifying ans implementing the protocol update
required to support device IOTLB with user backends.

In this second version, the slave requests channel part is re-used
from Marc-André's series submitted last year[0], with main changes
from original version being request/feature names renaming and addition
of the REPLY_ACK feature support.

Regarding IOTLB protocol, one noticeable change is the IOTLB miss request
reply made optionnal (i.e. only if slave requests it by setting the
VHOST_USER_NEED_REPLY flag in the message header). This change provides
more flexibility in the backend implementation of the feature.

The protocol is very close to kernel backends, except that a new
communication channel is introduced to enable the slave to send
requests to the master.

[0]: https://lists.gnu.org/archive/html/qemu-devel/2016-04/msg00095.html

Marc-André Lureau (2):
  vhost-user: add vhost_user to hold the chr
  vhost-user: add slave-req-fd support

Maxime Coquelin (2):
  vhost: propagate errors in vhost_device_iotlb_miss()
  spec/vhost-user spec: Add IOMMU support

 docs/specs/vhost-user.txt | 104 ++++++++++++++++++++-
 hw/virtio/vhost-user.c    | 234 +++++++++++++++++++++++++++++++++++++++++++++-
 hw/virtio/vhost.c         |  15 ++-
 include/hw/virtio/vhost.h |   2 +-
 4 files changed, 344 insertions(+), 11 deletions(-)

-- 
2.9.3