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 v5.4.168 by commit 560e64413b4a6d9bd6630e350d5f2e6a05f6ffe3. For more details please see the references link.