[PATCH v3 0/7] migration/cpr: support vhost-vsock devices

[Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>]

v2 -> v3:

Re-design device ownership hand-off (suggested by Dongli).  Do not rely
on SETUP migration notifiers, as this approach forces us to reorder
generic migration code (see v2 discussion).  Instead:

  * .pre_save() releases ownership on the source (RESET_OWNER) once VM
    is stopped;
  * .realize() is adjusted to defer device ownership acquisition for an
    incoming CPR;
  * .post_load() actually claims the device (VHOST_SET_OWNER);
  * FAILED migration event callback re-aquires the ownership on the
    source after re_save released it.

v2: https://lore.kernel.org/qemu-devel/57c9c9b3-d758-489b-95b8-d16c258b9b0c@virtuozzo.com

Andrey Drobyshev (7):
  vhost: add vhost_reset_owner op
  vhost-vsock: don't reset connections during CPR
  vhost-vsock: fix FD leak in realize()
  vhost-vsock: preserve vhost FD during CPR
  vhost: factor out vhost_dev_init_backend()
  vhost: add vhost_dev_set_owner() / vhost_dev_reset_owner() helpers
  vhost-vsock: hand off device ownership across CPR

 hw/virtio/vhost-kernel.c          |   6 +
 hw/virtio/vhost-vsock.c           | 208 +++++++++++++++++++++++++++---
 hw/virtio/vhost.c                 |  55 ++++++--
 include/hw/virtio/vhost-backend.h |   1 +
 include/hw/virtio/vhost-vsock.h   |   4 +
 include/hw/virtio/vhost.h         |  32 +++++
 6 files changed, 275 insertions(+), 31 deletions(-)

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2.47.1