vhost_user: Clear ring address on GET_VRING_BASE

GET_VRING_BASE stops the queue, clearing the call and kick fds.  However,
we don't clear vring.avail.  That means that if vu_queue_notify() is called
it won't realise the queue isn't ready and will die with an EBADFD.

We get this during migration, because for some reason, qemu reconfigures
the vhost-user device when a migration is triggered.  There's a window
between the GET_VRING_BASE and re-establishing the call fd where the
notify function can be called, causing a crash.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

0 files changed, 0 insertions, 0 deletions