Re: [Xen-devel] [PATCH v3 3/3] tools: introduce parameter max_wp_ram_ranges.

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Thursday, February 04, 2016 10:13 PM
> 
> >>> On 04.02.16 at 14:47, <Paul.Durrant@xxxxxxxxxx> wrote:
> >> From: Ian Jackson [mailto:Ian.Jackson@xxxxxxxxxxxxx]
> >> Sent: 04 February 2016 13:34
> >>  * Is it possible for libxl to somehow tell from the rest of the
> >>    configuration that this larger limit should be applied ?
> >>
> >>    AFAICT there is nothing in libxl directly involving vgpu.  How can
> >>    libxl be used to create a guest with vgpu enabled ?  I had thought
> >>    that this was done merely with the existing PCI passthrough
> >>    configuration, but it now seems that somehow a second device model
> >>    would have to be started.  libxl doesn't have code to do that.
> >>
> >
> > AIUI if the setting of the increased limit is tied to provisioning a gvt-g
> > instance for a VM then I don't there needs to be extra information in the VM
> > config. These seems like the most sensible thing to do.
> 
> I don't understand this: For one, it's still unclear to me on what basis
> it would be known that a given VM is a "gvt-g instance". And even if
> that's indeed derivable from something, the uncertainty about a
> workable upper bound on the number of WP ranges would still seem
> to demand the value to be specifiable separately...
> 

We'll invent a different parameter e.g. gvt-g from existing passthrough
one. So just for this question, a toolstack can know whether a VM is
provisioned with a vgpu based on that parameter from config file.

Thanks
Kevin

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