GRUB_CMDLINE_LINUX="cryptopts=target=myroot,source=UUID=xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx,discard cryptdevice=/dev/disk/by-uuid/xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx:myroot:allow-discards root=/dev/mapper/myroot rd.luks.options=discard luks.options=discard"