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Re: [libvirt] [PATCHv2 0/3] Xen: Fix <clock> handling



On 02/09/2012 03:01 PM, Eric Blake wrote:

> We absolutely cannot reject existing older xml files; but must load them
> with the semantics that make sense.
> 

> But a better idea is to represent the XML in a way where the default
> conversion makes sense, but where a user can explicitly change the XML
> to get what they want.  I'm thinking:
> 
> If offset is 'utc' or 'localtime', we add a new attribute 'adjustment',
> whose value can be either 'reset' to signify that the offset is reset on
> each boot, or a timeDelta, as shorthand for specifying offset='variable'
> adjustment='nnn' basis='utc|localtime'.  If the attribute is missing,
> the hypervisor determines whether the default is 'reset' or '0'.  Qemu
> would pick 'reset', xend would pick '0'.
> 

> 
> RNG-wise, this would be:

I missed basis:

> 
>       <element name='clock'>
>         <choice>
>           <group>
>             <attribute name='offset'>
>               <choice>
>                 <value>localtime</value>
>                 <value>utc</value>
>               </choice>
>             </attribute>
>             <optional>
>               <attribute name='adjustment'>
>                 <choice>
>                   <ref name='timeDelta'/>
>                   <value>reset</value>
>                 </choice>
>               </attribute>
>             </optional>
>           </group>
>           <group>
>             <attribute name='offset'>
>               <value>timezone</value>
>             </attribute>
>             <optional>
>               <attribute name='timezone'>
>                 <ref name='timeZone'/>
>               </attribute>
>             </optional>
>           </group>
>           <group>
>             <attribute name='offset'>
>               <value>variable</value>
>             </attribute>
>             <optional>
>               <attribute name='adjustment'>
>                 <ref name='timeDelta'/>
>               </attribute>
>             </optional>

              <optional>
                <attribute name='basis'>
                  <choice>
                    <value>utc</value>
                    <value>localtime</value>
                  </choice>
                </attribute>
              </optional>

>           </group>
>         </choice>
>         <zeroOrMore>
>           <ref name='timer'/>
>         </zeroOrMore>
>       </element>
> 

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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