The series introduce support for a new protocol request that
notifies the backend with Virtio device status updates.

Main goal is to be able with Virtio 1.0 devices to start
the port even if the guest hasn't initialized all the
queue pairs of the device. This case happens for example
with Windows driver if more queue pairs are declared than
there are vCPUs.

The patch also handles reset and failed driver status to
stop the device and destroy the virtqueues.

Last patch implements a workaround for old and current
QEMUs, that sends SET_VRING_ADDR requests for uninitalized
queues, which can leads to guest memory corruption if
the host application requests to diasble queues

I posted the series as RFC, as the QEMU & specification
parts for the new request haven't been accepted yet.

Maxime Coquelin (3):
  vhost: invalidate vring addresses in cleanup_vq()
  vhost: add SET_VIRTIO_STATUS support
  vhost_user: work around invalid rings addresses sent by QEMU

 lib/librte_vhost/vhost.c      |   6 ++-
 lib/librte_vhost/vhost.h      |   4 +-
 lib/librte_vhost/vhost_user.c | 113 +++++++++++++++++++++++++++++++++++++++++-
 lib/librte_vhost/vhost_user.h |   5 +-
 4 files changed, 123 insertions(+), 5 deletions(-)


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