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vfio/migration: Correct device state from vmstate change for savevm case

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Set _SAVING flag for device state from vmstate change handler when it
gets called from savevm.

Currently State transition savevm/suspend is seen as:
    _RUNNING -> _STOP -> Stop-and-copy -> _STOP

State transition savevm/suspend should be:
    _RUNNING -> Stop-and-copy -> _STOP

State transition from _RUNNING to _STOP occurs from
vfio_vmstate_change() where when vmstate changes from running to
!running, _RUNNING flag is reset but at the same time when
vfio_vmstate_change() is called for RUN_STATE_SAVE_VM, _SAVING bit
should be set.

Reported by: Yishai Hadas <yishaih@nvidia.com>
Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Message-Id: <1623177441-27496-1-git-send-email-kwankhede@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede 2021-06-09 00:07:21 +05:30 committed by Alex Williamson
parent 22fca190e2
commit d742d064c1
1 changed files with 10 additions and 1 deletions
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11
hw/vfio/migration.c
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@ -724,7 +724,16 @@ static void vfio_vmstate_change(void *opaque, bool running, RunState state)
* _RUNNING bit
*/
mask = ~VFIO_DEVICE_STATE_RUNNING;
value = 0;
/*
* When VM state transition to stop for savevm command, device should
* start saving data.
*/
if (state == RUN_STATE_SAVE_VM) {
value = VFIO_DEVICE_STATE_SAVING;
} else {
value = 0;
}
}
ret = vfio_migration_set_state(vbasedev, mask, value);