Re: [Qemu-devel] [PATCH RFC] vfio-ap: flag as compatible with balloon

[Christian Borntraeger]

On 07.12.2018 13:29, Cornelia Huck wrote:
> On Fri, 7 Dec 2018 13:17:02 +0100
> Christian Borntraeger <borntrae...@de.ibm.com> wrote:
> 
>> On 05.12.2018 15:51, Cornelia Huck wrote:
>>> vfio-ap devices do not pin any pages in the host. Therefore, they
>>> are belived to be compatible with memory ballooning.
>>>
>>> Flag them as compatible, so both vfio-ap and a balloon can be
>>> used simultaneously.
>>>
>>> Signed-off-by: Cornelia Huck <coh...@redhat.com>  
>>
>> Does it make sense to add cc stable for 3.1?
> 
> Can do that, given that s390x systems really rely on the ballooner in
> general.

Well, not relying is the wrong word. It is just strange that things like

  <memory unit='GiB'>2</memory>
  <currentMemory unit='GiB'>1</currentMemory>

do work 
but suddenly no longer work when an AP device is added.