This series fixes TX data discard when backend disconnects. On backend disconnection, QEMU cannot retrieve its internal avail index, which makes the virtio queue internal state inconsistent (last_avail_idx will always be 0, whereas used_idx is correct).
It results in discarding TX data to corrupt the vring state, by completing descriptors already completed by the backend. This series fixes this by restoring last_avail_idx to the vring used idx, as some backends used to do on reconnection. Maxime Coquelin (2): virtio: Add queue interface to restore avail index from vring used index vhost: restore avail index from vring used index on disconnection hw/virtio/vhost.c | 4 ++++ hw/virtio/virtio.c | 10 ++++++++++ include/hw/virtio/virtio.h | 1 + 3 files changed, 15 insertions(+) -- 2.14.3