Merge branch 'vsock-virtio-vhost-zerocopy'

Arseniy Krasnov says:

====================
vsock/virtio/vhost: MSG_ZEROCOPY preparations

this patchset is first of three parts of another big patchset for
MSG_ZEROCOPY flag support:
https://lore.kernel.org/netdev/[email protected]/

During review of this series, Stefano Garzarella <[email protected]>
suggested to split it for three parts to simplify review and merging:

1) virtio and vhost updates (for fragged skbs) <--- this patchset
2) AF_VSOCK updates (allows to enable MSG_ZEROCOPY mode and read
   tx completions) and update for Documentation/.
3) Updates for tests and utils.

This series enables handling of fragged skbs in virtio and vhost parts.
Newly logic won't be triggered, because SO_ZEROCOPY options is still
impossible to enable at this moment (next bunch of patches from big
set above will enable it).

I've included changelog to some patches anyway, because there were some
comments during review of last big patchset from the link above.

Head for this patchset is:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=f2fa1c812c91e99d0317d1fc7d845e1e05f39716

Link to v1:
https://lore.kernel.org/netdev/[email protected]/
Link to v2:
https://lore.kernel.org/netdev/[email protected]/
Link to v3:
https://lore.kernel.org/netdev/[email protected]/
Link to v4:
https://lore.kernel.org/netdev/[email protected]/
Link to v5:
https://lore.kernel.org/netdev/[email protected]/
Link to v6:
https://lore.kernel.org/netdev/[email protected]/
Link to v7:
https://lore.kernel.org/netdev/[email protected]/
Link to v8:
https://lore.kernel.org/netdev/[email protected]/

Changelog:
 v3 -> v4:
 * Patchset rebased and tested on new HEAD of net-next (see hash above).
 v4 -> v5:
 * See per-patch changelog after ---.
 v5 -> v6:
 * Patchset rebased and tested on new HEAD of net-next (see hash above).
 * See per-patch changelog after ---.
 v6 -> v7:
 * Patchset rebased and tested on new HEAD of net-next (see hash above).
 * See per-patch changelog after ---.
 v7 -> v8:
 * Patchset rebased and tested on new HEAD of net-next (see hash above).
 * See per-patch changelog after ---.
 v8 -> v9:
 * Patchset rebased and tested on new HEAD of net-next (see hash above).
 * See per-patch changelog after ---.
====================

Signed-off-by: David S. Miller <[email protected]>

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