Re: [Xen-devel] [PATCH v3 4/5] libxl: update vcpus bitmap in retrieved guest config

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Jul 11, 2016 at 12:31:43PM +0100, Wei Liu wrote:
[...]
> 
> > 
> > > +        /* If the user did not explicitly specify a device model
> > > +         * version, we need to use the same logic used during domain
> > > +         * creation to derive the device model version.
> > > +         */
> > > +        version = d_config->b_info.device_model_version;
> > > +        if (version == LIBXL_DEVICE_MODEL_VERSION_UNKNOWN)
> > > +            version = libxl__get_device_model_version(gc, 
> > > &d_config->b_info);
> > 
> > I think this is rather unfortunate.  Won't changing the default device
> > model while the domain is running will cause this function to give
> > wrong answers ?
> 
> I think saving the device model into the template should work. No need
> to derive it during runtime.
> 

Actually this information is already available via
libxl__device_model_version_running.

Wei.

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