Re: [virtio-comment] [PATCH v3 2/3] content: Document balloon feature page poison

[Cornelia Huck <cohuck@redhat.com>]

On Tue, 26 May 2020 17:28:00 +0200
David Hildenbrand <david@redhat.com> wrote:

> On 26.05.20 16:50, Alexander Duyck wrote:
> > On Tue, May 26, 2020 at 1:24 AM David Hildenbrand <david@redhat.com> wrote:  

> >> Still wondering what to do with free page hinting ... in the meantime
> >> I'll have a look at free page reporting :)  
> > 
> > The problem is it is already out there so I worry we wouldn't ever be
> > able to get rid of it. At most we could deprecate it, but we are still
> > stuck with it consuming bit resources and such.  
> 
> Yeah, that's not an issue, they will simply turn to dead bits with
> minimal documentation. I just don't see us fixing/supporting that
> feature, really. Let's see what @MST things when he has time to look
> into this.
> 

If free page hinting is broken enough that we don't want anybody to try
implementing it, we maybe could:

- reserve the feature bit,
- say that the device SHOULD NOT offer it,
- say that the driver SHOULD NOT accept it?

Would avoid conflicts, and tell implementors that they should not
bother. (We can then proceed to start deprecating the Linux/QEMU
implementations.)


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