Re: [Xen-users] usage of the extra parameter in vm configs

["M.A. Williamson" <maw48@xxxxxxxxx>]

> After using xen for quite some time, I just start to wonder what the
> "extra" value in the vm config is good for.
extra is just a placeholder for misc kernel arguments. Any random arguments 
you might want to pass through can be specified there and they'll get 
tacked onto the end of the kernel command line. These might be special 
options for kernel behaviour, or for some driver, or to be parsed from 
/proc/cmdline by a userspace program within the guest OS.
It doesn't really have a specific purpose. :-)

We'd actually been talking about replacing the current "root=", "extra=" 
etc. arguments with a single "cmdline=" which would contain the entire 
kernel commandline - in the same way that a normal bootloader might. This 
would make the process of setting the command line a little more 
transparent.
It's certainly safe to not use it if not required...

Does this answer your question satisfactorily?

HTH,
Cheers,
Mark

> The example configs explain it can be used to set the runlevel - but i
> never removed this option, so it was alwas  there and set to the
> default 4 from the example, and still all my debian domUs start fine
> in runlevel 2 as usual.
> So I wonder if there's some real-world example of using the extra variable.
>
> Henning
>
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