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Re: Grub2 documentation of the GRUB_CMDLINE_*XEN* parameters -- unclear.


From: Andrei Borzenkov
Subject: Re: Grub2 documentation of the GRUB_CMDLINE_*XEN* parameters -- unclear. What's _intended_?
Date: Sun, 22 Nov 2015 09:37:43 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0

22.11.2015 03:12, PGNet Dev пишет:
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.

That's not what current manual says. Please use current upstream sources when you contact upstream.

     ‘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.

I agree it is a bit fuzzy. If set, it is used for Linux kernel arguments in Xen menu entries. Care to send a patch clarifying it?

     ...

 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


Please direct this question to your distribution. For a start, there is no grub2-mkconfig upstream.

     # 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 ...


I have no idea what you are talking about, sorry. Again, you need to direct this question to your distribution.

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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