From mboxrd@z Thu Jan  1 00:00:00 1970
From: Cornelia Huck <cohuck@redhat.com>
Subject: Re: [PATCH v9 12/22] s390: vfio-ap: sysfs interfaces to configure
 control domains
Date: Thu, 23 Aug 2018 12:25:25 +0200
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To: Tony Krowiak <akrowiak@linux.ibm.com>
Cc: Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@de.ibm.com>, pmorel@linux.ibm.com, Tony Krowiak <akrowiak@linux.vnet.ibm.com>, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com, alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com, mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com, thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com, fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com, frankja@linux.ibm.com
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On Wed, 22 Aug 2018 15:16:19 -0400
Tony Krowiak <akrowiak@linux.ibm.com> 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...]