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(-)
