[PATCH 0/6] vhost: Reset batched descriptors on SET_VRING_BASE call

["Eugenio Pérez" <eperezma@redhat.com>]

Vhost did not reset properly the batched descriptors on SET_VRING_BASE event. Because of that, is possible to return an invalid descriptor to the guest.

This series ammend this, and creates a test to assert correct behavior. To do that, they need to expose a new function in virtio_ring, virtqueue_reset_free_head. Not sure if this can be avoided.

Also, change from https://lkml.org/lkml/2020/3/27/108 is not included, that avoids to update a variable in a loop where it can be updated once.

This is meant to be applied on top of eccb852f1fe6bede630e2e4f1a121a81e34354ab in git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git, and some commits should be squashed with that series.

Eugenio Pérez (6):
  tools/virtio: Add --batch option
  tools/virtio: Add --batch=random option
  tools/virtio: Add --reset=random
  tools/virtio: Make --reset reset ring idx
  vhost: Delete virtqueue batch_descs member
  fixup! vhost: batching fetches

 drivers/vhost/test.c         |  57 ++++++++++++++++
 drivers/vhost/test.h         |   1 +
 drivers/vhost/vhost.c        |  12 +++-
 drivers/vhost/vhost.h        |   1 -
 drivers/virtio/virtio_ring.c |  18 +++++
 include/linux/virtio.h       |   2 +
 tools/virtio/linux/virtio.h  |   2 +
 tools/virtio/virtio_test.c   | 123 +++++++++++++++++++++++++++++++----
 8 files changed, 201 insertions(+), 15 deletions(-)

-- 
2.18.1