Re: [PATCH 1/2] libxl: expose multiple emulators per guest in the capabilities XML

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On Mon, Apr 29, 2013 at 12:54:55PM -0600, Jim Fehlig wrote:
> Daniel P. Berrange wrote:
> >
> >
> > NB, for any single (arch, domain, os_type) triple, we should only
> > report one <guest> in the capabilities XML. IIUC, your code above
> > report cause us to have two entries for the same triple.
> 
> Right.  David mentioned in the cover letter that the resulting
> capabilities would looks something like
> 
>     <arch name='i686'>
>       <wordsize>32</wordsize>
>       <machine>xenfv</machine>
>       <domain type='xen'>
>         <emulator>/usr/lib64/xen/bin/qemu-dm</emulator>
>         <loader>/usr/lib/xen/boot/hvmloader</loader>
>       </domain>
>       <domain type='xen'>
>         <emulator>/usr/lib64/xen/bin/qemu-system-i386</emulator>
>         <loader>/usr/lib/xen/boot/hvmloader</loader>
>       </domain>
>     </arch>

Yep, that would not be right, because there are two <domain>
elements for type='xen' here. Each domain type is only allowed
to exist once. So what you really want is something like

     <arch name='i686'>
       <emulator>/usr/lib64/xen/bin/qemu-dm</emulator>
       <loader>/usr/lib/xen/boot/hvmloader</loader>
       <wordsize>32</wordsize>
       <machine>xenfv</machine>
       <domain type='xen'>
       </domain>
     </arch>

(Or choose the other qemu binary - which ever is declared as
the "preferred" one).


Daniel
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