Re: [PATCH v9 12/22] s390: vfio-ap: sysfs interfaces to configure control domains

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On Thu, 23 Aug 2018 12:43:42 +0200
Pierre Morel <pmorel@xxxxxxxxxxxxx> wrote:

> On 23/08/2018 12:25, Cornelia Huck wrote:
> > On Wed, 22 Aug 2018 15:16:19 -0400
> > Tony Krowiak <akrowiak@xxxxxxxxxxxxx> wrote:
> >   
> >> One of the things I suggested in a private conversation with Christian
> >> earlier
> >> today was to provide an additional rw sysfs attribute - a boolean - that
> >> indicates
> >> whether all usage domains should also be control domains. The default
> >> could be
> >> true. This would allow one to configure guests with usage-only domains
> >> as well
> >> as satisfy the convention.  
> > 
> > Would this additional attribute then control "add usage domains to the
> > list of control domains automatically", or "don't allow to add a usage
> > domain if it has not already been added as a control domain"?
> > 
> > One thing I'm still unsure about is how libvirt comes into the picture
> > here. Will it consume the setting, or actively manipulate it?
> > 
> > [In general, I'm not very clear about how libvirt will interact with the
> > whole infrastructure...]
> >   
> 
> When I read you it convince me that it is not wise to change anything
> that has been already discuss and could impact the Libvirt.

My main point basically was that we should get feedback from a libvirt
POV :) The new attribute may make sense, or not; but I'm really feeling
a bit in the dark with regard to libvirt.



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