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Re: [PATCH v9 0/5] Extend virtio-balloon for fast (de)inflating & fast live migration

From Matthew Wilcox <willy@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH v9 0/5] Extend virtio-balloon for fast (de)inflating & fast live migration
Date 2017-04-13 22:50 +0200
Message-ID <tvTQJ-8fn-3@gated-at.bofh.it> (permalink)
References <tvJy1-14D-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, Apr 13, 2017 at 05:35:03PM +0800, Wei Wang wrote:
> 2) transfer the guest unused pages to the host so that they
> can be skipped to migrate in live migration.

I don't understand this second bit.  You leave the pages on the free list,
and tell the host they're free.  What's preventing somebody else from
allocating them and using them for something?  Is the guest semi-frozen
at this point with just enough of it running to ask the balloon driver
to do things?

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[PATCH v9 0/5] Extend virtio-balloon for fast (de)inflating & fast live migration Wei Wang <wei.w.wang@intel.com> - 2017-04-13 11:50 +0200
  [PATCH v9 5/5] virtio-balloon: VIRTIO_BALLOON_F_MISC_VQ Wei Wang <wei.w.wang@intel.com> - 2017-04-13 11:50 +0200
    Re: [PATCH v9 5/5] virtio-balloon: VIRTIO_BALLOON_F_MISC_VQ "Michael S. Tsirkin" <mst@redhat.com> - 2017-04-13 19:10 +0200
  [PATCH v9 3/5] mm: function to offer a page block on the free list Wei Wang <wei.w.wang@intel.com> - 2017-04-13 11:50 +0200
    Re: [PATCH v9 3/5] mm: function to offer a page block on the free  list Andrew Morton <akpm@linux-foundation.org> - 2017-04-13 22:10 +0200
      Re: [PATCH v9 3/5] mm: function to offer a page block on the free  list Wei Wang <wei.w.wang@intel.com> - 2017-04-14 04:30 +0200
        Re: [PATCH v9 3/5] mm: function to offer a page block on the free  list Matthew Wilcox <willy@infradead.org> - 2017-04-14 05:00 +0200
          Re: [PATCH v9 3/5] mm: function to offer a page block on the free  list Wei Wang <wei.w.wang@intel.com> - 2017-04-14 11:00 +0200
  [PATCH v9 2/5] virtio-balloon: VIRTIO_BALLOON_F_BALLOON_CHUNKS Wei Wang <wei.w.wang@intel.com> - 2017-04-13 11:50 +0200
    Re: [PATCH v9 2/5] virtio-balloon: VIRTIO_BALLOON_F_BALLOON_CHUNKS "Michael S. Tsirkin" <mst@redhat.com> - 2017-04-13 18:40 +0200
      Re: [PATCH v9 2/5] virtio-balloon: VIRTIO_BALLOON_F_BALLOON_CHUNKS Matthew Wilcox <willy@infradead.org> - 2017-04-13 19:10 +0200
      Re: [virtio-dev] Re: [PATCH v9 2/5] virtio-balloon: VIRTIO_BALLOON_F_BALLOON_CHUNKS Wei Wang <wei.w.wang@intel.com> - 2017-04-14 10:40 +0200
        Re: [virtio-dev] Re: [PATCH v9 2/5] virtio-balloon:  VIRTIO_BALLOON_F_BALLOON_CHUNKS "Michael S. Tsirkin" <mst@redhat.com> - 2017-04-14 23:40 +0200
          Re: [virtio-dev] Re: [PATCH v9 2/5] virtio-balloon: VIRTIO_BALLOON_F_BALLOON_CHUNKS Wei Wang <wei.w.wang@intel.com> - 2017-04-17 05:40 +0200
  Re: [PATCH v9 0/5] Extend virtio-balloon for fast (de)inflating &  fast live migration Matthew Wilcox <willy@infradead.org> - 2017-04-13 22:50 +0200
    Re: [PATCH v9 0/5] Extend virtio-balloon for fast (de)inflating &  fast live migration "Michael S. Tsirkin" <mst@redhat.com> - 2017-04-14 04:00 +0200
      Re: [PATCH v9 0/5] Extend virtio-balloon for fast (de)inflating &  fast live migration Wei Wang <wei.w.wang@intel.com> - 2017-04-14 04:30 +0200
        Re: [PATCH v9 0/5] Extend virtio-balloon for fast (de)inflating &  fast live migration "Michael S. Tsirkin" <mst@redhat.com> - 2017-04-14 05:00 +0200
      Re: [PATCH v9 0/5] Extend virtio-balloon for fast (de)inflating &  fast live migration Matthew Wilcox <willy@infradead.org> - 2017-04-14 11:50 +0200
        Re: [PATCH v9 0/5] Extend virtio-balloon for fast (de)inflating &  fast live migration "Michael S. Tsirkin" <mst@redhat.com> - 2017-04-14 16:30 +0200

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