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

On 05/26/2020 11:38 PM, Cornelia Huck wrote:
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:

May I know the issues that you got with FREE_PAGE_HINT?

I thought the discussion was about the PAGE_POISON bit (not related to FREE_PAGE_HINT).
It just enables a way for guest to tell host about the poison value.
I think currently we don't have a usage in QEMU to use the poison value (not sure about other userspace),
so it's disabled by default.


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