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

[Wei Wang <wei.w.wang@intel.com>]

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.

Best,
Wei


This publicly archived list offers a means to provide input to the
OASIS Virtual I/O Device (VIRTIO) TC.

In order to verify user consent to the Feedback License terms and
to minimize spam in the list archive, subscription is required
before posting.

Subscribe: virtio-comment-subscribe@lists.oasis-open.org
Unsubscribe: virtio-comment-unsubscribe@lists.oasis-open.org
List help: virtio-comment-help@lists.oasis-open.org
List archive: https://lists.oasis-open.org/archives/virtio-comment/
Feedback License: https://www.oasis-open.org/who/ipr/feedback_license.pdf
List Guidelines: https://www.oasis-open.org/policies-guidelines/mailing-lists
Committee: https://www.oasis-open.org/committees/virtio/
Join OASIS: https://www.oasis-open.org/join/