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charset="utf-8" When migrating a VFIO device that supports pre-copy, it is transitioned to STOP_COPY twice: once in vfio_vmstate_change() and second time in vfio_save_complete_precopy(). The second transition is harmless, as it's a STOP_COPY->STOP_COPY no-op transition. However, with the newly added VFIO migration QAPI event, the STOP_COPY event is undesirably emitted twice. Prevent this by returning early in vfio_migration_set_state() if new_state is the same as current device state. Note that the STOP_COPY transition in vfio_save_complete_precopy() is essential for VFIO devices that don't support pre-copy, for migrating an already stopped guest and for snapshots. Signed-off-by: Avihai Horon Reviewed-by: C=C3=A9dric Le Goater --- hw/vfio/migration.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c index 5a359c4c78..14ef9c924e 100644 --- a/hw/vfio/migration.c +++ b/hw/vfio/migration.c @@ -143,6 +143,10 @@ static int vfio_migration_set_state(VFIODevice *vbased= ev, (struct vfio_device_feature_mig_state *)feature->data; int ret; =20 + if (new_state =3D=3D migration->device_state) { + return 0; + } + feature->argsz =3D sizeof(buf); feature->flags =3D VFIO_DEVICE_FEATURE_SET | VFIO_DEVICE_FEATURE_MIG_DEVICE_STATE; --=20 2.26.3