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Subject: Re: [PATCH v25 QEMU 0/3] virtio-balloon: add support for page poison and free page reporting

It's been almost 2 weeks since I submitted this. Just thought I would
follow up and see if there is any ETA on when this might be applied,
or if I missed the need to fix something and resubmit.


- Alex

On Tue, May 26, 2020 at 9:13 PM Alexander Duyck
<alexander.duyck@gmail.com> wrote:
> This series provides an asynchronous means of reporting free guest pages
> to QEMU through virtio-balloon so that the memory associated with those
> pages can be dropped and reused by other processes and/or guests on the
> host. Using this it is possible to avoid unnecessary I/O to disk and
> greatly improve performance in the case of memory overcommit on the host.
> I originally submitted this patch series back on February 11th 2020[1],
> but at that time I was focused primarily on the kernel portion of this
> patch set. However as of April 7th those patches are now included in
> Linus's kernel tree[2] and so I am submitting the QEMU pieces for
> inclusion.
> [1]: https://lore.kernel.org/lkml/20200211224416.29318.44077.stgit@localhost.localdomain/
> [2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b0c504f154718904ae49349147e3b7e6ae91ffdc
> Changes from v17:
> Fixed typo in patch 1 title
> Addressed white-space issues reported via checkpatch
> Added braces {} for two if statements to match expected coding style
> Changes from v18:
> Updated patches 2 and 3 based on input from dhildenb
> Added comment to patch 2 describing what keeps us from reporting a bad page
> Added patch to address issue with ROM devices being directly writable
> Changes from v19:
> Added std-headers change to match changes pushed for linux kernel headers
> Added patch to remove "report" from page hinting code paths
> Updated comment to better explain why we disable hints w/ page poisoning
> Removed code that was modifying config size for poison vs hinting
> Dropped x-page-poison property
> Added code to bounds check the reported region vs the RAM block
> Dropped patch for ROM devices as that was already pulled in by Paolo
> Changes from v20:
> Rearranged patches to push Linux header sync patches to front
> Removed association between free page hinting and VIRTIO_BALLOON_F_PAGE_POISON
> Added code to enable VIRTIO_BALLOON_F_PAGE_POISON if page reporting is enabled
> Fixed possible resource leak if poison or qemu_balloon_is_inhibited return true
> Changes from v21:
> Added ack for patch 3
> Rewrote patch description for page poison reporting feature
> Made page-poison independent property and set to enabled by default
> Added logic to migrate poison_val
> Added several comments in code to better explain features
> Switched free-page-reporting property to disabled by default
> Changes from v22:
> Added ack for patches 4 & 5
> Added additional comment fixes in patch 3 to remove "reporting" reference
> Renamed rvq in patch 5 to reporting_vq to better match linux kernel
> Moved call adding reporting_vq to after free_page_vq
> Changes from v23:
> Rebased on latest QEMU
> Dropped patches 1 & 2 as Linux kernel headers were synced
> Added compat machine code for page-poison feature
> Changes from v24:
> Moved free page hinting rename to end of set as feature may be removed entirely
> Added code to cleanup reporting_vq
> ---
> Alexander Duyck (3):
>       virtio-balloon: Implement support for page poison reporting feature
>       virtio-balloon: Provide an interface for free page reporting
>       virtio-balloon: Replace free page hinting references to 'report' with 'hint'
>  hw/core/machine.c                  |    4 +
>  hw/virtio/virtio-balloon.c         |  179 ++++++++++++++++++++++++++++--------
>  include/hw/virtio/virtio-balloon.h |   23 ++---
>  3 files changed, 155 insertions(+), 51 deletions(-)
> --

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