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Installs linux-hardened + linux-hardened-headers alongside the stock
linux kernel. Stock kernel remains the default; linux-hardened is opt-in
via efibootmgr --bootnext after the EFI entry is registered (one-time
host-side step, documented in the preset).
After first 'just pkg-apply', mkinitcpio auto-builds
/boot/EFI/Linux/arch-linux-hardened.efi from the new preset (sharing
etc/kernel/cmdline.tmpl with the stock UKI — same LUKS root, no
kernel-specific cmdline knobs).
Host-side EFI entry registration:
sudo efibootmgr --create --disk /dev/nvme0n1 --part 1 \
--label 'Arch Hardened' --loader '\\EFI\\Linux\\arch-linux-hardened.efi'
Roll back any time by removing both packages and the preset file; the
stock kernel and its UKI are untouched.
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sommerfeld