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Grub2 documentation of the GRUB_CMDLINE_*XEN* parameters -- unclear. Wha


From: PGNet Dev
Subject: Grub2 documentation of the GRUB_CMDLINE_*XEN* parameters -- unclear. What's _intended_?
Date: Sat, 21 Nov 2015 16:12:52 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:42.0) Gecko/20100101 Thunderbird/42.0

Grub2 documentation @ https://www.gnu.org/software/grub/manual/grub.html#Configuration states

        ...
        ‘GRUB_CMDLINE_XEN’
        ‘GRUB_CMDLINE_XEN_DEFAULT’

The values of these options are appended to the values of ‘GRUB_CMDLINE_LINUX’ and ‘GRUB_CMDLINE_LINUX_DEFAULT’ for Linux and Xen menu entries.
        ‘GRUB_CMDLINE_LINUX_XEN_REPLACE’
        ‘GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT’

The values of these options replace the values of ‘GRUB_CMDLINE_LINUX’ and ‘GRUB_CMDLINE_LINUX_DEFAULT’ for Linux and Xen menu entries.
        ...

From these docs. it's not clear which values get mapped to which grub entries. One set 'appends', one set 'replaces'. Are they exclusive of one another?

And, what specifically gets mapped to Xen kernel's "options=" parameter line?

E.g., a grub2-mkconfig-generated xen*.cfg takes the form

        # disclaimer
        [global]
        #default=

        [config.1]
        options= dom0_mem= ...
        kernel=vmlinuz-4.3.0-16.gff1dcd9-xen ...
        ramdisk=initrd-4.3.0-16.gff1dcd9-xen ...

whereas for a NON-xen grub*.cfg

        # disclaimer
        [global]
        #default=

        [config.1]
        kernel=vmlinuz-4.3.0-16.gff1dcd9-default ...
        ramdisk=initrd-4.3.0-16.gff1dcd9-default ...

there's NO "options=..." line.

The docs should clearly address which PARAMETERS map to the "options=" line, and which to the kernel=" line in the Xen case.

To get there -- What's intended, by designn, from development in these specific *XEN* cases?



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