[Qemu-devel] [PATCH v3 0/5] virtio-9p: hotplug and migration support

[Greg Kurz <gkurz@linux.vnet.ibm.com>]

We already have a blocker to prevent migration of an active virtio-9p device.
But in fact, there is no migration support at all for 9p, even if the device
is considered to be quiescent (when the VirtFS share is not mounted): migration
succeeds but the device is lost in the restarted guest.
Hotunplug of a virtio-9p device is not supported either (no unrealize handler)
and leads to a QEMU crash on the source node, if one unplugs and migrates.

This series tries to fix that and brings hotplug and migration support of
*quiescent* virtio-9p devices.

v2->v3:
 - renamed QDEV handler @unpluggable to @unplug_is_blocked (patches 2/5
   and 3/5)

v1->v2:
 - introduced unplug blocker (patches 2/5 and 3/5)
 - moved fixes to separate patches (see individual changelogs)

---

Greg Kurz (5):
      virtio-9p-coth: fix init function
      qdev: add the @unplug_is_blocked handler
      virtio-9p: block hot-unplug when device is active
      virtio-9p: add unrealize handler
      virtio-9p: add savem handlers


 hw/9pfs/virtio-9p-coth.c   |   22 ++++++++++++++++++----
 hw/9pfs/virtio-9p-coth.h   |    2 ++
 hw/9pfs/virtio-9p-device.c |   24 ++++++++++++++++++++++++
 hw/9pfs/virtio-9p.c        |   14 ++++++++++++++
 hw/9pfs/virtio-9p.h        |    2 ++
 hw/core/qdev.c             |    4 ++++
 hw/s390x/virtio-ccw.c      |    8 ++++++++
 hw/virtio/virtio-pci.c     |    8 ++++++++
 include/hw/qdev-core.h     |    4 ++++
 9 files changed, 84 insertions(+), 4 deletions(-)