xen/console: harden hvc_xen against event channel storms
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.19.222 by commit 57e46acb3b48ea4e8efb1e1bea2e89e0c6cc43e2. For more details please see the references link.