qubes-linux-utils/grub/grub.qubes-kernel-vm-support

# add kernel options only in VM, and only if initramfs is updated already
# /var/lib/qubes/initramfs-updated contains "milestone" initramfs update version:
# 1 - addition of xen scrub_pages enabling code
if [ -r /usr/share/qubes/marker-vm ] &&
        [ "$(cat /var/lib/qubes/initramfs-updated 2>/dev/null || echo 0)" -ge 1 ]; then
    GRUB_CMDLINE_LINUX="$GRUB_CMDLINE_LINUX xen_scrub_pages=0"
fi
GRUB_ENABLE_BLSCFG=false