guest to remote communication with vhost net sometimes stops until
guest driver is restarted. This happens when we get guest kick precisely
when the backend send queue is full, as a result handle_tx() returns without
polling backend. This patch fixes this by restarting tx poll on this condition.
Signed-off-by: Sridhar Samudrala <firstname.lastname@example.org>
Signed-off-by: Michael S. Tsirkin <email@example.com>
Tested-by: Tom Lendacky <firstname.lastname@example.org>