Source of kernel config: firecracker-microvm/firecracker#1721 (comment)
Options required for Firecracker's SendCtrlAltDel: https://github.com/firecracker-microvm/firecracker/blob/2b8ad83629af511f918d616aa1c0d441e52c397a/docs/api_requests/actions.md#intel-and-amd-only-sendctrlaltdel
To build the kernel use
./build.shthis will build vmlinux using docker. If you're building the kernel locally keep in mind that newer binutils are incompatible with linux 5.6, if having problems please use the fix-build.patch patch.