Re: [Xen-devel] SSID and CPU pool parsing in xl / libxl

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2014-04-25 at 11:20 +0100, Wei Liu wrote:
> Hi Daniel, Dario, Juergen and others
> 
> I'm trying to overhaul some libxl infrastructure at the moment, so that
> we can preserve domain configurations across save and restore. The first
> step is libxl needs to be able to serialize / deserialize
> configurations.
> 
> When I went through the list of xl config file options, most of the
> options can be easily serialized and sent over the wire to the other
> end. But SSID parsing and CPU pool ID parsing look exceptional -- they
> happen in xl (toolstack) level, not libxl (library) level.
> 
> Take "init_seclabel" as an example, xl calls libxl_flask_context_to_sid
> to translate a string to an SSID (which is local to host) then passes it
> to libxl. If libxl serialize its data, then the receiving end only sees
> the translated SSID, not the "init_seclabel". The string is actually the
> relavent bit to rebuild a domain, not the SSID (because it's local to
> host). The same situation applies to CPU pool ID parsing.
> 
> I plan to push the parsing down to libxl level, but I'm not sure if
> there's any reason it's done in xl in the first place. Please let me
> know if you have any concern.

FWIW when I spoke to Wei about this IRL I couldn't think of/remember any
reason why this parsing was done in xl not libxl.

Ian.



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