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Re: [libvirt] [PATCHv2 2/8] doc: schema: Add basic documentation for the virtual RNG device support

On 02/25/13 22:01, Eric Blake wrote:
On 02/25/2013 02:08 AM, Peter Krempa wrote:
On 02/22/13 19:20, Eric Blake wrote:
On 02/21/2013 07:47 AM, Peter Krempa wrote:
This patch documents XML elements used for (basic) support of virtual
RNG devices.

For the slightly more advanced EGD backend:
      <rng model='virtio'>
        <backend model='egd' type='udp'>
          <!-- this is a definition of a character device -->
          <source mode='bind' service='1234'/>
          <source mode='connect' host='' service='1234'/>
          <!-- or other valid character device configuration -->

Do we really want two <source> in a single <backend> in the example, or
would it be easier to show multiple <rng> devices, one for each type of

That actually is valid for the character device backends. The UDP
backend has to use two separate sources for bi-directional
communication. The definition of that source type is declared as a type
in our RNG schema an I merely reused that.

Oh, I didn't realize that.  Do we want to ENFORCE that there are two
<source> elements present then?  Or can we always provide a sane default
when the user provides only 0 or 1 source?  Depending on that answer, it
might be worth additional documentation on why two <source> elements are
present, as well as mentioning that order is significant in how they are

I reused the code to facilitate the operations done with character devices. There's present infrastructure [1] that allows to parse, format and create commandlines for qemu. The defaults for the syntax of the XML and the expected values should be documented in the section describing character devices. (But I did not really check if the description is exhaustive)

In hindsight I should have linked that section in the description of the egd backend model explicitly rather than by just mentioning it.


[1]: virDomainChrSourceDefParseXML, virDomainChrSourceDefFormat, qemuBuildChrChardevStr

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