ACRN specific GRUB configuration items
--------------------------------------

The following variables can be set and exported in /etc/default/grub.d/acrn.cfg
to control GRUB boot menu generation for ACRN:

GRUB_CMDLINE_ACRN: command line parameter for the ACRN hypervisor. This will
                   be merged with parameters from ACRN configuration. E.g.
                   add a required uart parameter, see
                   https://projectacrn.github.io/latest/user-guides/hv-parameters.html

GRUB_CMDLINE_LINUX and GRUB_CMDLINE_LINUX_DEFAULT (in /etc/default/grub) can be
used as usual and apply to the ACRN Service VM only. They are appended to the
settings provided by ACRN configuration.

ACRN VM specific variables:

GRUB_ACRN_MOD_CMDLINE_<tagname>: kernel command line parameter for VM using the
                                 kernel module tag <tagname> in its configuration.

Attention: Using GRUB_ACRN_MOD_CMDLINE_<tagname> for Service VM associated kernel
           module tag will *OVERRIDE* the settings provided by ACRN configuration
           and is *NOT* recommended! So, be careful!

GRUB_ACRN_MOD_<tagname>: path of the module tagged with <tagname>. This is valid
                         for kernel module tags, ramdisk module tags and acpi
                         module tags.

Remember: There is no need to set the acpi module tag, since it defaults to
          generated /boot/ACPI_VMx.bin anyway!