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Re: [qemu-s390x] [PATCH RFC] vfio-ap: flag as compatible with balloon

From: Christian Borntraeger
Subject: Re: [qemu-s390x] [PATCH RFC] vfio-ap: flag as compatible with balloon
Date: Fri, 7 Dec 2018 13:32:14 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 07.12.2018 13:29, Cornelia Huck wrote:
> On Fri, 7 Dec 2018 13:17:02 +0100
> Christian Borntraeger <address@hidden> 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 <address@hidden>  
>> 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.

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