From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-comment-return-1300-cohuck=redhat.com@lists.oasis-open.org Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: Message-ID: <5ECE053E.1000206@intel.com> Date: Wed, 27 May 2020 14:14:22 +0800 From: Wei Wang MIME-Version: 1.0 References: <158994007522.397236.7536927155973222190.stgit@ahduyck-workstation> <158994014779.397236.836253101843237605.stgit@ahduyck-workstation> <60278259-9a04-77ab-f96f-c13bc2ffb070@redhat.com> <53e66faa-ed7f-f7c1-6284-1e2a6e63c936@redhat.com> <733c9230-1bec-11f2-9fc9-ed53beedbc66@redhat.com> <20200526173835.4a839ec6.cohuck@redhat.com> In-Reply-To: <20200526173835.4a839ec6.cohuck@redhat.com> Subject: [virtio-comment] Re: [virtio-dev] Re: [virtio-comment] [PATCH v3 2/3] content: Document balloon feature page poison Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit To: Cornelia Huck , David Hildenbrand Cc: Alexander Duyck , "Michael S. Tsirkin" , virtio-comment@lists.oasis-open.org, virtio-dev@lists.oasis-open.org List-ID: On 05/26/2020 11:38 PM, Cornelia Huck wrote: > On Tue, 26 May 2020 17:28:00 +0200 > David Hildenbrand wrote: > >> On 26.05.20 16:50, Alexander Duyck wrote: >>> On Tue, May 26, 2020 at 1:24 AM David Hildenbrand 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/