Re: [Xen-users] ucode=-1: did anybody have success?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-05-08 at 21:11 +0200, Atom2 wrote:
> Am 07.05.14 10:50, schrieb Ian Campbell:
> > On Tue, 2014-05-06 at 20:39 +0200, Atom2 wrote:
> >> Am 06.05.14 15:27, schrieb Sven KÃhler:
> >>> Hi,
> >>>
> >>> does anybody use Xen's ucode=-1 option successfully?
> >>> I'm trying to update the microcode before dom0 starts, since my dom0
> >>> doesn't have the xen microcode driver. I'm using a vanilla 3.12.x kernel
> >>> from kernel.org and to the best of my knowledge, the xen microcode
> >>> kernel driver didn't make it upstream yet.
> >> It took me quiet some time as well to figure out how to get it to work,
> >> but I finally sorted it out some time ago.
> >
> > Could I by any chance prevail on you to write a patch to the
> > documentation or create a wiki page perhaps?
> Ian, if you might lend me a helping hand to get things started, I am 
> happy to write something up.
> 
> In terms of documentation - are you thinking about a specific man page 
> and if so, what would I need to get that started? Or would it be a 
> simple text file for /usr/share/doc? In any case, I'd actually prefer 
> those options over a wiki as either of the former would automatically be 
> delivered with every xen installation and therefore readily available to 
> the user-base. Furthermore I have never myself created any webpages so 
> far ... (I know, shame on me ...)

A simple text file under docs/misc would be fine, with a reference from
the appropriate place in docs/misc/xen-command-line.markdown.

The file can either be *.txt or you can do *.markdown which is a
simple .txt like markup language
(http://daringfireball.net/projects/markdown/)

In either case the result will be shipped with Xen and installed
into /usr/doc as well as automatically published at
http://xenbits.xen.org/docs/unstable/misc/index.html (from where wiki
pages can link as necessary etc).

BTW, WRT the wiki: FWIW we use mediawiki so the syntax is the same as
the gentoo wiki, I think, although I think wanting to ship it with Xen
is a good enough reason to go the docs/misc route.

> There is one caveat though: I currently only use XEN 4.3 which does not 
> support the prepended file to the initramfs yet. Therefore it might make 
> sense to postpone this until XEN 4.4 is considered stable by Gentoo and 
> I am up and running with this version. What are your thoughts on this?

Eventually the docs should cover both mechanisms I think, so documenting
the ones supported in 4.3 would be a good starting point.

I'm a big fan of adding some documentation, even if it is incomplete,
since the "activation energy" for updating or extending a doc tends to
be lower than that needed to write it.

A section header for the prepended method with just "TBD" in it would be
fine. One of us should then remember to add it to
http://wiki.xen.org/wiki/Xen_Document_Days/TODO.

Ian.


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