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Re: [Xen-devel] xen-commandline document


  • To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Juergen Gross <jgross@xxxxxxxx>
  • Date: Tue, 15 Jan 2019 10:59:30 +0100
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  • Delivery-date: Tue, 15 Jan 2019 09:59:41 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 15/01/2019 10:38, Andrew Cooper wrote:
> On 15/01/2019 09:23, Juergen Gross wrote:
>> Recently there have been several requests to add disclaimers
>> like "only applicable if CONFIG_xyz defined" to
>> docs/misc/xen-command-line.pandoc.
>>
>> As that file will be used as source for the installed file
>> /usr/share/doc/xen/html/misc/xen-command-line.html there might be
>> a better alternative instead of adding such disclaimers: what if
>> we put such options in #ifdef CONFIG_xyz sections and let CPP
>> create a file with only those options documented which are
>> applicable to the installed hypervisor?
>>
>> The source file used would be still available for the developer
>> (who should understand the #ifdefs) while on a Xen host only the
>> available options would be documented. For locations like
>>
>> http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html
>>
>> we could use an "allyesconfig" for each architecture as config
>> source.
>>
>> Thoughts?
> 
> allyesconfig doesn't work with mutually incompatible options, where one
> of them will definitely be n
> 
> Overall, I'm fairly -1 to this idea.  I don't like the idea of merging
> the xen/ and docs/ builds to be able to make this happen, and while it
> may be fairly simple and easy in the ARGO case, it is most definitely
> not in the XSM case.
> 
> There is a specific reason why documentation isn't written in C, and IMO
> it should be kept that way.

Fair enough. :-)

So plan B:

Give the user an interface to obtain the .config used to create the
currently running hypervisor (I guess this was discussed at least once
before). I'd suggest an option for "xl info", but I'm open for other
interfaces.

Then add potential config restrictions to the command line parameter doc
(like already done for x86/arm) with a preamble telling the reader how
to read those restrictions.


Juergen

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