[PATCH v3 0/8] vhost: Reset batched descriptors on SET_VRING_BASE call

Eugenio Pérez
2020-03-31T19:28:21Z

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, resetting them every time backend changes, 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, only
on test code.

Another useful thing would be to check if mutex is properly get in
vq private_data accessors. Not sure if mutex debug code allow that,
similar to C++ unique lock::owns_lock. Not acquiring in the function
because caller code holds the mutex in order to perform more actions.

v3:
* Rename accesors functions.
* Make scsi and test use the accesors too.

v2:
* Squashed commits.
* Create vq private_data accesors (mst).

This is meant to be applied on top of
c4f1c41a6094582903c75c0dcfacb453c959d457 in
git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git.

Eugenio Pérez (5):
vhost: Create accessors for virtqueues private_data
tools/virtio: Add --batch option
tools/virtio: Add --batch=random option
tools/virtio: Add --reset=random
tools/virtio: Make --reset reset ring idx

Michael S. Tsirkin (3):
vhost: option to fetch descriptors through an independent struct
vhost: use batched version by default
vhost: batching fetches

drivers/vhost/net.c | 28 ++--
drivers/vhost/scsi.c | 14 +-
drivers/vhost/test.c | 69 ++++++++-
drivers/vhost/test.h | 1 +
drivers/vhost/vhost.c | 271 +++++++++++++++++++++++------------
drivers/vhost/vhost.h | 44 +++++-
drivers/vhost/vsock.c | 14 +-
drivers/virtio/virtio_ring.c | 29 ++++
tools/virtio/linux/virtio.h | 2 +
tools/virtio/virtio_test.c | 123 ++++++++++++++--
10 files changed, 456 insertions(+), 139 deletions(-)

--
2.18.1