[PATCH V4 00/14] allow cpr-reboot for vfio

[Steve Sistare <steven.sistare@oracle.com>]

Allow cpr-reboot for vfio if the guest is in the suspended runstate.  The
guest drivers' suspend methods flush outstanding requests and re-initialize
the devices, and thus there is no device state to save and restore.  The
user is responsible for suspending the guest before initiating cpr, such as
by issuing guest-suspend-ram to the qemu guest agent.

Most of the patches in this series enhance migration notifiers so they can
return an error status and message.  The last few patches register a notifier
for vfio that returns an error if the guest is not suspended.

Changes in V3:
  * update to tip, add RB's
  * replace MigrationStatus with new enum MigrationEventType
  * simplify migrate_fd_connect error recovery
  * support vfio iommufd containers
  * add patches:
      migration: stop vm for cpr
      migration: update cpr-reboot description

Changes in V4:
  * rebase to tip, add RB's
  * add patch to prevent options such as precopy from being used with cpr.
      migration: options incompatible with cpr
  * refactor subroutines in "stop vm for cpr"
  * simplify "notifier error checking" patch by restricting that only
    notifiers for MIG_EVENT_PRECOPY_SETUP may return an error.
  * doc that a fail event may be sent without a prior setup event

Steve Sistare (14):
  notify: pass error to notifier with return
  migration: remove error from notifier data
  migration: convert to NotifierWithReturn
  migration: MigrationEvent for notifiers
  migration: remove postcopy_after_devices
  migration: MigrationNotifyFunc
  migration: per-mode notifiers
  migration: refactor migrate_fd_connect failures
  migration: notifier error checking
  migration: stop vm for cpr
  vfio: register container for cpr
  vfio: allow cpr-reboot migration if suspended
  migration: update cpr-reboot description
  migration: options incompatible with cpr

 hw/net/virtio-net.c                   |  13 +--
 hw/vfio/common.c                      |   2 +-
 hw/vfio/container.c                   |  11 ++-
 hw/vfio/cpr.c                         |  39 +++++++++
 hw/vfio/iommufd.c                     |   6 ++
 hw/vfio/meson.build                   |   1 +
 hw/vfio/migration.c                   |  15 ++--
 hw/vfio/trace-events                  |   2 +-
 hw/virtio/vhost-user.c                |  10 +--
 hw/virtio/virtio-balloon.c            |   3 +-
 include/hw/vfio/vfio-common.h         |   5 +-
 include/hw/vfio/vfio-container-base.h |   1 +
 include/hw/virtio/virtio-net.h        |   2 +-
 include/migration/misc.h              |  47 +++++++++--
 include/qemu/notify.h                 |   8 +-
 migration/migration.c                 | 148 +++++++++++++++++++++++-----------
 migration/migration.h                 |   4 -
 migration/postcopy-ram.c              |   3 +-
 migration/postcopy-ram.h              |   1 -
 migration/ram.c                       |   3 +-
 net/vhost-vdpa.c                      |  14 ++--
 qapi/migration.json                   |  37 ++++++---
 roms/seabios-hppa                     |   2 +-
 ui/spice-core.c                       |  17 ++--
 util/notify.c                         |   5 +-
 25 files changed, 275 insertions(+), 124 deletions(-)
 create mode 100644 hw/vfio/cpr.c

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1.8.3.1